[v5,1/4] drm/panthor: introduce job cycle and timestamp accounting

Commit Message

Adrián Larumbe Sept. 3, 2024, 8:25 p.m. UTC

Enable calculations of job submission times in clock cycles and wall
time. This is done by expanding the boilerplate command stream when running
a job to include instructions that compute said times right before an after
a user CS.

A separate kernel BO is created per queue to store those values. Jobs can
access their sampled data through a slots buffer-specific index different
from that of the queue's ringbuffer. The reason for this is saving memory
on the profiling information kernel BO, since the amount of simultaneous
profiled jobs we can write into the queue's ringbuffer might be much
smaller than for regular jobs, as the former take more CSF instructions.

This commit is done in preparation for enabling DRM fdinfo support in the
Panthor driver, which depends on the numbers calculated herein.

A profile mode mask has been added that will in a future commit allow UM to
toggle performance metric sampling behaviour, which is disabled by default
to save power. When a ringbuffer CS is constructed, timestamp and cycling
sampling instructions are added depending on the enabled flags in the
profiling mask.

A helper was provided that calculates the number of instructions for a
given set of enablement mask, and these are passed as the number of credits
when initialising a DRM scheduler job.

Signed-off-by: Adrián Larumbe <[e-mail]>
---
 drivers/gpu/drm/panthor/panthor_device.h |  22 ++
 drivers/gpu/drm/panthor/panthor_sched.c  | 327 ++++++++++++++++++++---
 2 files changed, 305 insertions(+), 44 deletions(-)

Comments

Boris Brezillon Sept. 4, 2024, 7:49 a.m. UTC | #1

On Tue,  3 Sep 2024 21:25:35 +0100
Adrián Larumbe <[e-mail]> wrote:

> Enable calculations of job submission times in clock cycles and wall
> time. This is done by expanding the boilerplate command stream when running
> a job to include instructions that compute said times right before an after
> a user CS.
> 
> A separate kernel BO is created per queue to store those values. Jobs can
> access their sampled data through a slots buffer-specific index different
> from that of the queue's ringbuffer. The reason for this is saving memory
> on the profiling information kernel BO, since the amount of simultaneous
> profiled jobs we can write into the queue's ringbuffer might be much
> smaller than for regular jobs, as the former take more CSF instructions.
> 
> This commit is done in preparation for enabling DRM fdinfo support in the
> Panthor driver, which depends on the numbers calculated herein.
> 
> A profile mode mask has been added that will in a future commit allow UM to
> toggle performance metric sampling behaviour, which is disabled by default
> to save power. When a ringbuffer CS is constructed, timestamp and cycling
> sampling instructions are added depending on the enabled flags in the
> profiling mask.
> 
> A helper was provided that calculates the number of instructions for a
> given set of enablement mask, and these are passed as the number of credits
> when initialising a DRM scheduler job.
> 
> Signed-off-by: Adrián Larumbe <[e-mail]>
> ---
>  drivers/gpu/drm/panthor/panthor_device.h |  22 ++
>  drivers/gpu/drm/panthor/panthor_sched.c  | 327 ++++++++++++++++++++---
>  2 files changed, 305 insertions(+), 44 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_device.h b/drivers/gpu/drm/panthor/panthor_device.h
> index e388c0472ba7..a48e30d0af30 100644
> --- a/drivers/gpu/drm/panthor/panthor_device.h
> +++ b/drivers/gpu/drm/panthor/panthor_device.h
> @@ -66,6 +66,25 @@ struct panthor_irq {
>  	atomic_t suspended;
>  };
>  
> +/**
> + * enum panthor_device_profiling_mode - Profiling state
> + */
> +enum panthor_device_profiling_flags {
> +	/** @PANTHOR_DEVICE_PROFILING_DISABLED: Profiling is disabled. */
> +	PANTHOR_DEVICE_PROFILING_DISABLED = 0,
> +
> +	/** @PANTHOR_DEVICE_PROFILING_CYCLES: Sampling job cycles. */
> +	PANTHOR_DEVICE_PROFILING_CYCLES = BIT(0),
> +
> +	/** @PANTHOR_DEVICE_PROFILING_TIMESTAMP: Sampling job timestamp. */
> +	PANTHOR_DEVICE_PROFILING_TIMESTAMP = BIT(1),
> +
> +	/** @PANTHOR_DEVICE_PROFILING_ALL: Sampling everything. */
> +	PANTHOR_DEVICE_PROFILING_ALL =
> +	PANTHOR_DEVICE_PROFILING_CYCLES |
> +	PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> +};
> +
>  /**
>   * struct panthor_device - Panthor device
>   */
> @@ -162,6 +181,9 @@ struct panthor_device {
>  		 */
>  		struct page *dummy_latest_flush;
>  	} pm;
> +
> +	/** @profile_mask: User-set profiling flags for job accounting. */
> +	u32 profile_mask;
>  };
>  
>  /**
> diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c
> index c426a392b081..b087648bf59a 100644
> --- a/drivers/gpu/drm/panthor/panthor_sched.c
> +++ b/drivers/gpu/drm/panthor/panthor_sched.c
> @@ -93,6 +93,9 @@
>  #define MIN_CSGS				3
>  #define MAX_CSG_PRIO				0xf
>  
> +#define NUM_INSTRS_PER_CACHE_LINE		(64 / sizeof(u64))
> +#define MAX_INSTRS_PER_JOB			32
> +
>  struct panthor_group;
>  
>  /**
> @@ -476,6 +479,18 @@ struct panthor_queue {
>  		 */
>  		struct list_head in_flight_jobs;
>  	} fence_ctx;
> +
> +	/** @profiling_info: Job profiling data slots and access information. */
> +	struct {
> +		/** @slots: Kernel BO holding the slots. */
> +		struct panthor_kernel_bo *slots;
> +
> +		/** @slot_count: Number of jobs ringbuffer can hold at once. */
> +		u32 slot_count;
> +
> +		/** @profiling_seqno: Index of the next available profiling information slot. */
> +		u32 profiling_seqno;

Nit: no need to repeat profiling as it's under the profiling_info
struct. I would simply name that one 'seqno'.

> +	} profiling_info;

s/profiling_info/profiling/ ?

>  };
>  
>  /**
> @@ -661,6 +676,18 @@ struct panthor_group {
>  	struct list_head wait_node;
>  };
>  
> +struct panthor_job_profiling_data {
> +	struct {
> +		u64 before;
> +		u64 after;
> +	} cycles;
> +
> +	struct {
> +		u64 before;
> +		u64 after;
> +	} time;
> +};
> +
>  /**
>   * group_queue_work() - Queue a group work
>   * @group: Group to queue the work for.
> @@ -774,6 +801,12 @@ struct panthor_job {
>  
>  	/** @done_fence: Fence signaled when the job is finished or cancelled. */
>  	struct dma_fence *done_fence;
> +
> +	/** @profile_mask: Current device job profiling enablement bitmask. */
> +	u32 profile_mask;
> +
> +	/** @profile_slot: Job profiling information index in the profiling slots BO. */
> +	u32 profiling_slot;

Nit: we tend to group fields together under sub-structs, so I'd say:

	struct {
		u32 mask; // or flags
		u32 slot;
	} profiling;

>  };
>  
>  static void
> @@ -838,6 +871,7 @@ static void group_free_queue(struct panthor_group *group, struct panthor_queue *
>  
>  	panthor_kernel_bo_destroy(queue->ringbuf);
>  	panthor_kernel_bo_destroy(queue->iface.mem);
> +	panthor_kernel_bo_destroy(queue->profiling_info.slots);
>  
>  	/* Release the last_fence we were holding, if any. */
>  	dma_fence_put(queue->fence_ctx.last_fence);
> @@ -1982,8 +2016,6 @@ tick_ctx_init(struct panthor_scheduler *sched,
>  	}
>  }
>  
> -#define NUM_INSTRS_PER_SLOT		16
> -
>  static void
>  group_term_post_processing(struct panthor_group *group)
>  {
> @@ -2815,65 +2847,211 @@ static void group_sync_upd_work(struct work_struct *work)
>  	group_put(group);
>  }
>  
> -static struct dma_fence *
> -queue_run_job(struct drm_sched_job *sched_job)
> +struct panthor_job_ringbuf_instrs {
> +	u64 buffer[MAX_INSTRS_PER_JOB];
> +	u32 count;
> +};
> +
> +struct panthor_job_instr {
> +	u32 profile_mask;
> +	u64 instr;
> +};
> +
> +#define JOB_INSTR(__prof, __instr) \
> +	{ \
> +		.profile_mask = __prof, \
> +		.instr = __instr, \
> +	}
> +
> +static void
> +copy_instrs_to_ringbuf(struct panthor_queue *queue,
> +		       struct panthor_job *job,
> +		       struct panthor_job_ringbuf_instrs *instrs)
> +{
> +	ssize_t ringbuf_size = panthor_kernel_bo_size(queue->ringbuf);
> +	u32 start = job->ringbuf.start & (ringbuf_size - 1);
> +	ssize_t size, written;
> +
> +	/*
> +	 * We need to write a whole slot, including any trailing zeroes
> +	 * that may come at the end of it. Also, because instrs.buffer had
> +	 * been zero-initialised, there's no need to pad it with 0's
> +	 */
> +	instrs->count = ALIGN(instrs->count, NUM_INSTRS_PER_CACHE_LINE);
> +	size = instrs->count * sizeof(u64);
> +	written = min(ringbuf_size - start, size);
> +
> +	memcpy(queue->ringbuf->kmap + start, instrs->buffer, written);
> +
> +	if (written < size)
> +		memcpy(queue->ringbuf->kmap,
> +		       &instrs->buffer[(ringbuf_size - start)/sizeof(u64)],
> +		       size - written);
> +}
> +
> +struct panthor_job_cs_params {
> +	u32 profile_mask;
> +	u64 addr_reg; u64 val_reg;
> +	u64 cycle_reg; u64 time_reg;
> +	u64 sync_addr; u64 times_addr;
> +	u64 cs_start; u64 cs_size;
> +	u32 last_flush; u32 waitall_mask;
> +};
> +
> +static void
> +get_job_cs_params(struct panthor_job *job, struct panthor_job_cs_params *params)
>  {
> -	struct panthor_job *job = container_of(sched_job, struct panthor_job, base);
>  	struct panthor_group *group = job->group;
>  	struct panthor_queue *queue = group->queues[job->queue_idx];
>  	struct panthor_device *ptdev = group->ptdev;
>  	struct panthor_scheduler *sched = ptdev->scheduler;
> -	u32 ringbuf_size = panthor_kernel_bo_size(queue->ringbuf);
> -	u32 ringbuf_insert = queue->iface.input->insert & (ringbuf_size - 1);
> -	u64 addr_reg = ptdev->csif_info.cs_reg_count -
> -		       ptdev->csif_info.unpreserved_cs_reg_count;
> -	u64 val_reg = addr_reg + 2;
> -	u64 sync_addr = panthor_kernel_bo_gpuva(group->syncobjs) +
> -			job->queue_idx * sizeof(struct panthor_syncobj_64b);
> -	u32 waitall_mask = GENMASK(sched->sb_slot_count - 1, 0);
> -	struct dma_fence *done_fence;
> -	int ret;
>  
> -	u64 call_instrs[NUM_INSTRS_PER_SLOT] = {
> +	params->addr_reg = ptdev->csif_info.cs_reg_count -
> +			   ptdev->csif_info.unpreserved_cs_reg_count;
> +	params->val_reg = params->addr_reg + 2;
> +	params->cycle_reg = params->addr_reg;
> +	params->time_reg = params->val_reg;
> +
> +	params->sync_addr = panthor_kernel_bo_gpuva(group->syncobjs) +
> +			    job->queue_idx * sizeof(struct panthor_syncobj_64b);
> +	params->times_addr = panthor_kernel_bo_gpuva(queue->profiling_info.slots) +
> +			     (job->profiling_slot * sizeof(struct panthor_job_profiling_data));
> +	params->waitall_mask = GENMASK(sched->sb_slot_count - 1, 0);
> +
> +	params->cs_start = job->call_info.start;
> +	params->cs_size = job->call_info.size;
> +	params->last_flush = job->call_info.latest_flush;
> +
> +	params->profile_mask = job->profile_mask;
> +}
> +
> +static void
> +prepare_job_instrs(const struct panthor_job_cs_params *params,
> +		   struct panthor_job_ringbuf_instrs *instrs)
> +{
> +	const struct panthor_job_instr instr_seq[] = {
>  		/* MOV32 rX+2, cs.latest_flush */
> -		(2ull << 56) | (val_reg << 48) | job->call_info.latest_flush,
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (2ull << 56) | (params->val_reg << 48) | params->last_flush),
>  
>  		/* FLUSH_CACHE2.clean_inv_all.no_wait.signal(0) rX+2 */
> -		(36ull << 56) | (0ull << 48) | (val_reg << 40) | (0 << 16) | 0x233,
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (36ull << 56) | (0ull << 48) | (params->val_reg << 40) | (0 << 16) | 0x233),
> +
> +		/* MOV48 rX:rX+1, cycles_offset */
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
> +			  (1ull << 56) | (params->cycle_reg << 48) |
> +			  (params->times_addr +
> +			   offsetof(struct panthor_job_profiling_data, cycles.before))),
> +		/* STORE_STATE cycles */
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
> +			  (40ull << 56) | (params->cycle_reg << 40) | (1ll << 32)),
> +		/* MOV48 rX:rX+1, time_offset */
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> +			  (1ull << 56) | (params->time_reg << 48) |
> +			  (params->times_addr +
> +			   offsetof(struct panthor_job_profiling_data, time.before))),
> +		/* STORE_STATE timer */
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> +			  (40ull << 56) | (params->time_reg << 40) | (0ll << 32)),
>  
>  		/* MOV48 rX:rX+1, cs.start */
> -		(1ull << 56) | (addr_reg << 48) | job->call_info.start,
> -
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (1ull << 56) | (params->addr_reg << 48) | params->cs_start),
>  		/* MOV32 rX+2, cs.size */
> -		(2ull << 56) | (val_reg << 48) | job->call_info.size,
> -
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (2ull << 56) | (params->val_reg << 48) | params->cs_size),
>  		/* WAIT(0) => waits for FLUSH_CACHE2 instruction */
> -		(3ull << 56) | (1 << 16),
> -
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED, (3ull << 56) | (1 << 16)),
>  		/* CALL rX:rX+1, rX+2 */
> -		(32ull << 56) | (addr_reg << 40) | (val_reg << 32),
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (32ull << 56) | (params->addr_reg << 40) | (params->val_reg << 32)),
> +
> +		/* MOV48 rX:rX+1, cycles_offset */
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
> +			  (1ull << 56) | (params->cycle_reg << 48) |
> +			  (params->times_addr +
> +			   offsetof(struct panthor_job_profiling_data, cycles.after))),
> +		/* STORE_STATE cycles */
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
> +			  (40ull << 56) | (params->cycle_reg << 40) | (1ll << 32)),
> +
> +		/* MOV48 rX:rX+1, time_offset */
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> +			  (1ull << 56) | (params->time_reg << 48) |
> +			  (params->times_addr +
> +			   offsetof(struct panthor_job_profiling_data, time.after))),
> +		/* STORE_STATE timer */
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> +			  (40ull << 56) | (params->time_reg << 40) | (0ll << 32)),
>  
>  		/* MOV48 rX:rX+1, sync_addr */
> -		(1ull << 56) | (addr_reg << 48) | sync_addr,
> -
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (1ull << 56) | (params->addr_reg << 48) | params->sync_addr),
>  		/* MOV48 rX+2, #1 */
> -		(1ull << 56) | (val_reg << 48) | 1,
> -
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (1ull << 56) | (params->val_reg << 48) | 1),
>  		/* WAIT(all) */
> -		(3ull << 56) | (waitall_mask << 16),
> -
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (3ull << 56) | (params->waitall_mask << 16)),
>  		/* SYNC_ADD64.system_scope.propage_err.nowait rX:rX+1, rX+2*/
> -		(51ull << 56) | (0ull << 48) | (addr_reg << 40) | (val_reg << 32) | (0 << 16) | 1,
> -
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (51ull << 56) | (0ull << 48) | (params->addr_reg << 40) |
> +			  (params->val_reg << 32) | (0 << 16) | 1),
>  		/* ERROR_BARRIER, so we can recover from faults at job
>  		 * boundaries.
>  		 */
> -		(47ull << 56),
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED, (47ull << 56)),
> +	};
> +	u32 pad;
> +
> +	/* NEED to be cacheline aligned to please the prefetcher. */
> +	static_assert(sizeof(instrs->buffer) % 64 == 0,
> +		      "panthor_job_ringbuf_instrs::buffer is not aligned on a cacheline");
> +
> +	/* Make sure we have enough storage to store the whole sequence. */
> +	static_assert(ALIGN(ARRAY_SIZE(instr_seq), NUM_INSTRS_PER_CACHE_LINE) <=
> +		      ARRAY_SIZE(instrs->buffer),
> +		      "instr_seq vs panthor_job_ringbuf_instrs::buffer size mismatch");

We probably want to catch situations where instrs->buffer has gone
bigger than needed (say we found a way to drop instructions), so I
would turn the '<=' condition into an '=='.

> +
> +	for (u32 i = 0; i < ARRAY_SIZE(instr_seq); i++) {
> +		/* If the profile mask of this instruction is not enabled, skip it. */
> +		if (instr_seq[i].profile_mask &&
> +		    !(instr_seq[i].profile_mask & params->profile_mask))
> +			continue;
> +
> +		instrs->buffer[instrs->count++] = instr_seq[i].instr;
> +	}
> +
> +	pad = ALIGN(instrs->count, NUM_INSTRS_PER_CACHE_LINE);
> +	memset(&instrs->buffer[instrs->count], 0,
> +	       (pad - instrs->count) * sizeof(instrs->buffer[0]));
> +	instrs->count = pad;
> +}
> +
> +static u32 calc_job_credits(u32 profile_mask)
> +{
> +	struct panthor_job_ringbuf_instrs instrs;
> +	struct panthor_job_cs_params params = {
> +		.profile_mask = profile_mask,
>  	};
>  
> -	/* Need to be cacheline aligned to please the prefetcher. */
> -	static_assert(sizeof(call_instrs) % 64 == 0,
> -		      "call_instrs is not aligned on a cacheline");
> +	prepare_job_instrs(&params, &instrs);
> +	return instrs.count;
> +}
> +
> +static struct dma_fence *
> +queue_run_job(struct drm_sched_job *sched_job)
> +{
> +	struct panthor_job *job = container_of(sched_job, struct panthor_job, base);
> +	struct panthor_group *group = job->group;
> +	struct panthor_queue *queue = group->queues[job->queue_idx];
> +	struct panthor_device *ptdev = group->ptdev;
> +	struct panthor_scheduler *sched = ptdev->scheduler;
> +	struct panthor_job_ringbuf_instrs instrs;
> +	struct panthor_job_cs_params cs_params;
> +	struct dma_fence *done_fence;
> +	int ret;
>  
>  	/* Stream size is zero, nothing to do except making sure all previously
>  	 * submitted jobs are done before we signal the
> @@ -2900,17 +3078,23 @@ queue_run_job(struct drm_sched_job *sched_job)
>  		       queue->fence_ctx.id,
>  		       atomic64_inc_return(&queue->fence_ctx.seqno));
>  
> -	memcpy(queue->ringbuf->kmap + ringbuf_insert,
> -	       call_instrs, sizeof(call_instrs));
> +	job->profiling_slot = queue->profiling_info.profiling_seqno++;
> +	if (queue->profiling_info.profiling_seqno == queue->profiling_info.slot_count)
> +		queue->profiling_info.profiling_seqno = 0;
> +
> +	job->ringbuf.start = queue->iface.input->insert;
> +
> +	get_job_cs_params(job, &cs_params);
> +	prepare_job_instrs(&cs_params, &instrs);
> +	copy_instrs_to_ringbuf(queue, job, &instrs);
> +
> +	job->ringbuf.end = job->ringbuf.start + (instrs.count * sizeof(u64));
>  
>  	panthor_job_get(&job->base);
>  	spin_lock(&queue->fence_ctx.lock);
>  	list_add_tail(&job->node, &queue->fence_ctx.in_flight_jobs);
>  	spin_unlock(&queue->fence_ctx.lock);
>  
> -	job->ringbuf.start = queue->iface.input->insert;
> -	job->ringbuf.end = job->ringbuf.start + sizeof(call_instrs);
> -
>  	/* Make sure the ring buffer is updated before the INSERT
>  	 * register.
>  	 */
> @@ -3003,6 +3187,24 @@ static const struct drm_sched_backend_ops panthor_queue_sched_ops = {
>  	.free_job = queue_free_job,
>  };
>  
> +static u32 calc_profiling_ringbuf_num_slots(struct panthor_device *ptdev,
> +				       u32 cs_ringbuf_size)
> +{
> +	u32 min_profiled_job_instrs = U32_MAX;
> +	u32 last_flag = fls(PANTHOR_DEVICE_PROFILING_ALL);
> +
> +	for (u32 i = 0; i < last_flag; i++) {
> +		if (BIT(i) & PANTHOR_DEVICE_PROFILING_ALL)
> +			min_profiled_job_instrs =
> +				min(min_profiled_job_instrs, calc_job_credits(BIT(i)));
> +	}

Okay, I think this loop deserves an explanation. The goal is to
calculate the minimal size of a profile job so we can deduce the
maximum number of profiling slots that will be used simultaneously. We
ignore PANTHOR_DEVICE_PROFILING_DISABLED, because those jobs won't use
a profiling slot in the first place.

> +
> +	drm_WARN_ON(&ptdev->base,
> +		    !IS_ALIGNED(min_profiled_job_instrs, NUM_INSTRS_PER_CACHE_LINE));

We can probably drop this WARN_ON(), it's supposed to be checked in
calc_job_credits().

> +
> +	return DIV_ROUND_UP(cs_ringbuf_size, min_profiled_job_instrs * sizeof(u64));
> +}
> +
>  static struct panthor_queue *
>  group_create_queue(struct panthor_group *group,
>  		   const struct drm_panthor_queue_create *args)
> @@ -3056,9 +3258,38 @@ group_create_queue(struct panthor_group *group,
>  		goto err_free_queue;
>  	}
>  
> +	queue->profiling_info.slot_count =
> +		calc_profiling_ringbuf_num_slots(group->ptdev, args->ringbuf_size);
> +
> +	queue->profiling_info.slots =
> +		panthor_kernel_bo_create(group->ptdev, group->vm,
> +					 queue->profiling_info.slot_count *
> +					 sizeof(struct panthor_job_profiling_data),
> +					 DRM_PANTHOR_BO_NO_MMAP,
> +					 DRM_PANTHOR_VM_BIND_OP_MAP_NOEXEC |
> +					 DRM_PANTHOR_VM_BIND_OP_MAP_UNCACHED,
> +					 PANTHOR_VM_KERNEL_AUTO_VA);
> +
> +	if (IS_ERR(queue->profiling_info.slots)) {
> +		ret = PTR_ERR(queue->profiling_info.slots);
> +		goto err_free_queue;
> +	}
> +
> +	ret = panthor_kernel_bo_vmap(queue->profiling_info.slots);
> +	if (ret)
> +		goto err_free_queue;
> +
> +	memset(queue->profiling_info.slots->kmap, 0,
> +	       queue->profiling_info.slot_count * sizeof(struct panthor_job_profiling_data));

I don't think we need to memset() the profiling buffer.

> +
> +	/*
> +	 * Credit limit argument tells us the total number of instructions
> +	 * across all CS slots in the ringbuffer, with some jobs requiring
> +	 * twice as many as others, depending on their profiling status.
> +	 */
>  	ret = drm_sched_init(&queue->scheduler, &panthor_queue_sched_ops,
>  			     group->ptdev->scheduler->wq, 1,
> -			     args->ringbuf_size / (NUM_INSTRS_PER_SLOT * sizeof(u64)),
> +			     args->ringbuf_size / sizeof(u64),
>  			     0, msecs_to_jiffies(JOB_TIMEOUT_MS),
>  			     group->ptdev->reset.wq,
>  			     NULL, "panthor-queue", group->ptdev->base.dev);
> @@ -3354,6 +3585,7 @@ panthor_job_create(struct panthor_file *pfile,
>  {
>  	struct panthor_group_pool *gpool = pfile->groups;
>  	struct panthor_job *job;
> +	u32 credits;
>  	int ret;
>  
>  	if (qsubmit->pad)
> @@ -3407,9 +3639,16 @@ panthor_job_create(struct panthor_file *pfile,
>  		}
>  	}
>  
> +	job->profile_mask = pfile->ptdev->profile_mask;
> +	credits = calc_job_credits(job->profile_mask);
> +	if (credits == 0) {
> +		ret = -EINVAL;
> +		goto err_put_job;
> +	}
> +
>  	ret = drm_sched_job_init(&job->base,
>  				 &job->group->queues[job->queue_idx]->entity,
> -				 1, job->group);
> +				 credits, job->group);
>  	if (ret)
>  		goto err_put_job;
>  

Just add a bunch of minor comments (mostly cosmetic changes), but the
implementation looks good to me.

Reviewed-by: Boris Brezillon <[e-mail]>

kernel test robot Sept. 4, 2024, 4:10 p.m. UTC | #2

Hi Adrián,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on linus/master v6.11-rc6 next-20240904]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Adri-n-Larumbe/drm-panthor-introduce-job-cycle-and-timestamp-accounting/20240904-042645
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20240903202541.430225-2-adrian.larumbe%40collabora.com
patch subject: [PATCH v5 1/4] drm/panthor: introduce job cycle and timestamp accounting
config: x86_64-buildonly-randconfig-002-20240904 (https://download.01.org/0day-ci/archive/20240904/[e-mail]/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240904/[e-mail]/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[e-mail]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[e-mail]/

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/panthor/panthor_sched.c:322: warning: Excess struct member 'runnable' description in 'panthor_scheduler'
   drivers/gpu/drm/panthor/panthor_sched.c:322: warning: Excess struct member 'idle' description in 'panthor_scheduler'
   drivers/gpu/drm/panthor/panthor_sched.c:322: warning: Excess struct member 'waiting' description in 'panthor_scheduler'
   drivers/gpu/drm/panthor/panthor_sched.c:322: warning: Excess struct member 'has_ref' description in 'panthor_scheduler'
   drivers/gpu/drm/panthor/panthor_sched.c:322: warning: Excess struct member 'in_progress' description in 'panthor_scheduler'
   drivers/gpu/drm/panthor/panthor_sched.c:322: warning: Excess struct member 'stopped_groups' description in 'panthor_scheduler'
   drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'mem' description in 'panthor_queue'
   drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'input' description in 'panthor_queue'
   drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'output' description in 'panthor_queue'
   drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'input_fw_va' description in 'panthor_queue'
   drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'output_fw_va' description in 'panthor_queue'
   drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'gpu_va' description in 'panthor_queue'
   drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'ref' description in 'panthor_queue'
   drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'gt' description in 'panthor_queue'
   drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'sync64' description in 'panthor_queue'
   drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'bo' description in 'panthor_queue'
   drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'offset' description in 'panthor_queue'
   drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'kmap' description in 'panthor_queue'
   drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'lock' description in 'panthor_queue'
   drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'id' description in 'panthor_queue'
   drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'seqno' description in 'panthor_queue'
   drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'last_fence' description in 'panthor_queue'
   drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'in_flight_jobs' description in 'panthor_queue'
>> drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'slots' description in 'panthor_queue'
>> drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'slot_count' description in 'panthor_queue'
>> drivers/gpu/drm/panthor/panthor_sched.c:494: warning: Excess struct member 'profiling_seqno' description in 'panthor_queue'
>> drivers/gpu/drm/panthor/panthor_sched.c:810: warning: Function parameter or struct member 'profiling_slot' not described in 'panthor_job'
   drivers/gpu/drm/panthor/panthor_sched.c:810: warning: Excess struct member 'start' description in 'panthor_job'
   drivers/gpu/drm/panthor/panthor_sched.c:810: warning: Excess struct member 'size' description in 'panthor_job'
   drivers/gpu/drm/panthor/panthor_sched.c:810: warning: Excess struct member 'latest_flush' description in 'panthor_job'
   drivers/gpu/drm/panthor/panthor_sched.c:810: warning: Excess struct member 'start' description in 'panthor_job'
   drivers/gpu/drm/panthor/panthor_sched.c:810: warning: Excess struct member 'end' description in 'panthor_job'
>> drivers/gpu/drm/panthor/panthor_sched.c:810: warning: Excess struct member 'profile_slot' description in 'panthor_job'
   drivers/gpu/drm/panthor/panthor_sched.c:1731: warning: Function parameter or struct member 'ptdev' not described in 'panthor_sched_report_fw_events'
   drivers/gpu/drm/panthor/panthor_sched.c:1731: warning: Function parameter or struct member 'events' not described in 'panthor_sched_report_fw_events'
   drivers/gpu/drm/panthor/panthor_sched.c:2623: warning: Function parameter or struct member 'ptdev' not described in 'panthor_sched_report_mmu_fault'


vim +494 drivers/gpu/drm/panthor/panthor_sched.c

de85488138247d Boris Brezillon 2024-02-29  397  
de85488138247d Boris Brezillon 2024-02-29  398  	/** @ringbuf: Command stream ring-buffer. */
de85488138247d Boris Brezillon 2024-02-29  399  	struct panthor_kernel_bo *ringbuf;
de85488138247d Boris Brezillon 2024-02-29  400  
de85488138247d Boris Brezillon 2024-02-29  401  	/** @iface: Firmware interface. */
de85488138247d Boris Brezillon 2024-02-29  402  	struct {
de85488138247d Boris Brezillon 2024-02-29  403  		/** @mem: FW memory allocated for this interface. */
de85488138247d Boris Brezillon 2024-02-29  404  		struct panthor_kernel_bo *mem;
de85488138247d Boris Brezillon 2024-02-29  405  
de85488138247d Boris Brezillon 2024-02-29  406  		/** @input: Input interface. */
de85488138247d Boris Brezillon 2024-02-29  407  		struct panthor_fw_ringbuf_input_iface *input;
de85488138247d Boris Brezillon 2024-02-29  408  
de85488138247d Boris Brezillon 2024-02-29  409  		/** @output: Output interface. */
de85488138247d Boris Brezillon 2024-02-29  410  		const struct panthor_fw_ringbuf_output_iface *output;
de85488138247d Boris Brezillon 2024-02-29  411  
de85488138247d Boris Brezillon 2024-02-29  412  		/** @input_fw_va: FW virtual address of the input interface buffer. */
de85488138247d Boris Brezillon 2024-02-29  413  		u32 input_fw_va;
de85488138247d Boris Brezillon 2024-02-29  414  
de85488138247d Boris Brezillon 2024-02-29  415  		/** @output_fw_va: FW virtual address of the output interface buffer. */
de85488138247d Boris Brezillon 2024-02-29  416  		u32 output_fw_va;
de85488138247d Boris Brezillon 2024-02-29  417  	} iface;
de85488138247d Boris Brezillon 2024-02-29  418  
de85488138247d Boris Brezillon 2024-02-29  419  	/**
de85488138247d Boris Brezillon 2024-02-29  420  	 * @syncwait: Stores information about the synchronization object this
de85488138247d Boris Brezillon 2024-02-29  421  	 * queue is waiting on.
de85488138247d Boris Brezillon 2024-02-29  422  	 */
de85488138247d Boris Brezillon 2024-02-29  423  	struct {
de85488138247d Boris Brezillon 2024-02-29  424  		/** @gpu_va: GPU address of the synchronization object. */
de85488138247d Boris Brezillon 2024-02-29  425  		u64 gpu_va;
de85488138247d Boris Brezillon 2024-02-29  426  
de85488138247d Boris Brezillon 2024-02-29  427  		/** @ref: Reference value to compare against. */
de85488138247d Boris Brezillon 2024-02-29  428  		u64 ref;
de85488138247d Boris Brezillon 2024-02-29  429  
de85488138247d Boris Brezillon 2024-02-29  430  		/** @gt: True if this is a greater-than test. */
de85488138247d Boris Brezillon 2024-02-29  431  		bool gt;
de85488138247d Boris Brezillon 2024-02-29  432  
de85488138247d Boris Brezillon 2024-02-29  433  		/** @sync64: True if this is a 64-bit sync object. */
de85488138247d Boris Brezillon 2024-02-29  434  		bool sync64;
de85488138247d Boris Brezillon 2024-02-29  435  
de85488138247d Boris Brezillon 2024-02-29  436  		/** @bo: Buffer object holding the synchronization object. */
de85488138247d Boris Brezillon 2024-02-29  437  		struct drm_gem_object *obj;
de85488138247d Boris Brezillon 2024-02-29  438  
de85488138247d Boris Brezillon 2024-02-29  439  		/** @offset: Offset of the synchronization object inside @bo. */
de85488138247d Boris Brezillon 2024-02-29  440  		u64 offset;
de85488138247d Boris Brezillon 2024-02-29  441  
de85488138247d Boris Brezillon 2024-02-29  442  		/**
de85488138247d Boris Brezillon 2024-02-29  443  		 * @kmap: Kernel mapping of the buffer object holding the
de85488138247d Boris Brezillon 2024-02-29  444  		 * synchronization object.
de85488138247d Boris Brezillon 2024-02-29  445  		 */
de85488138247d Boris Brezillon 2024-02-29  446  		void *kmap;
de85488138247d Boris Brezillon 2024-02-29  447  	} syncwait;
de85488138247d Boris Brezillon 2024-02-29  448  
de85488138247d Boris Brezillon 2024-02-29  449  	/** @fence_ctx: Fence context fields. */
de85488138247d Boris Brezillon 2024-02-29  450  	struct {
de85488138247d Boris Brezillon 2024-02-29  451  		/** @lock: Used to protect access to all fences allocated by this context. */
de85488138247d Boris Brezillon 2024-02-29  452  		spinlock_t lock;
de85488138247d Boris Brezillon 2024-02-29  453  
de85488138247d Boris Brezillon 2024-02-29  454  		/**
de85488138247d Boris Brezillon 2024-02-29  455  		 * @id: Fence context ID.
de85488138247d Boris Brezillon 2024-02-29  456  		 *
de85488138247d Boris Brezillon 2024-02-29  457  		 * Allocated with dma_fence_context_alloc().
de85488138247d Boris Brezillon 2024-02-29  458  		 */
de85488138247d Boris Brezillon 2024-02-29  459  		u64 id;
de85488138247d Boris Brezillon 2024-02-29  460  
de85488138247d Boris Brezillon 2024-02-29  461  		/** @seqno: Sequence number of the last initialized fence. */
de85488138247d Boris Brezillon 2024-02-29  462  		atomic64_t seqno;
de85488138247d Boris Brezillon 2024-02-29  463  
7b6f9ec6ad5112 Boris Brezillon 2024-07-03  464  		/**
7b6f9ec6ad5112 Boris Brezillon 2024-07-03  465  		 * @last_fence: Fence of the last submitted job.
7b6f9ec6ad5112 Boris Brezillon 2024-07-03  466  		 *
7b6f9ec6ad5112 Boris Brezillon 2024-07-03  467  		 * We return this fence when we get an empty command stream.
7b6f9ec6ad5112 Boris Brezillon 2024-07-03  468  		 * This way, we are guaranteed that all earlier jobs have completed
7b6f9ec6ad5112 Boris Brezillon 2024-07-03  469  		 * when drm_sched_job::s_fence::finished without having to feed
7b6f9ec6ad5112 Boris Brezillon 2024-07-03  470  		 * the CS ring buffer with a dummy job that only signals the fence.
7b6f9ec6ad5112 Boris Brezillon 2024-07-03  471  		 */
7b6f9ec6ad5112 Boris Brezillon 2024-07-03  472  		struct dma_fence *last_fence;
7b6f9ec6ad5112 Boris Brezillon 2024-07-03  473  
de85488138247d Boris Brezillon 2024-02-29  474  		/**
de85488138247d Boris Brezillon 2024-02-29  475  		 * @in_flight_jobs: List containing all in-flight jobs.
de85488138247d Boris Brezillon 2024-02-29  476  		 *
de85488138247d Boris Brezillon 2024-02-29  477  		 * Used to keep track and signal panthor_job::done_fence when the
de85488138247d Boris Brezillon 2024-02-29  478  		 * synchronization object attached to the queue is signaled.
de85488138247d Boris Brezillon 2024-02-29  479  		 */
de85488138247d Boris Brezillon 2024-02-29  480  		struct list_head in_flight_jobs;
de85488138247d Boris Brezillon 2024-02-29  481  	} fence_ctx;
6f64890b41a576 Adrián Larumbe  2024-09-03  482  
6f64890b41a576 Adrián Larumbe  2024-09-03  483  	/** @profiling_info: Job profiling data slots and access information. */
6f64890b41a576 Adrián Larumbe  2024-09-03  484  	struct {
6f64890b41a576 Adrián Larumbe  2024-09-03  485  		/** @slots: Kernel BO holding the slots. */
6f64890b41a576 Adrián Larumbe  2024-09-03  486  		struct panthor_kernel_bo *slots;
6f64890b41a576 Adrián Larumbe  2024-09-03  487  
6f64890b41a576 Adrián Larumbe  2024-09-03  488  		/** @slot_count: Number of jobs ringbuffer can hold at once. */
6f64890b41a576 Adrián Larumbe  2024-09-03  489  		u32 slot_count;
6f64890b41a576 Adrián Larumbe  2024-09-03  490  
6f64890b41a576 Adrián Larumbe  2024-09-03  491  		/** @profiling_seqno: Index of the next available profiling information slot. */
6f64890b41a576 Adrián Larumbe  2024-09-03  492  		u32 profiling_seqno;
6f64890b41a576 Adrián Larumbe  2024-09-03  493  	} profiling_info;
de85488138247d Boris Brezillon 2024-02-29 @494  };
de85488138247d Boris Brezillon 2024-02-29  495

kernel test robot Sept. 4, 2024, 5:02 p.m. UTC | #3

Hi Adrián,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm-misc/drm-misc-next]
[also build test ERROR on linus/master v6.11-rc6 next-20240904]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Adri-n-Larumbe/drm-panthor-introduce-job-cycle-and-timestamp-accounting/20240904-042645
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20240903202541.430225-2-adrian.larumbe%40collabora.com
patch subject: [PATCH v5 1/4] drm/panthor: introduce job cycle and timestamp accounting
config: arc-allmodconfig (https://download.01.org/0day-ci/archive/20240905/[e-mail]/config)
compiler: arceb-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240905/[e-mail]/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[e-mail]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[e-mail]/

All errors (new ones prefixed by >>):

   In file included from <command-line>:
   In function 'copy_instrs_to_ringbuf',
       inlined from 'queue_run_job' at drivers/gpu/drm/panthor/panthor_sched.c:3089:2:
>> include/linux/compiler_types.h:510:45: error: call to '__compiletime_assert_435' declared with attribute error: min(ringbuf_size - start, size) signedness error
     510 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:491:25: note: in definition of macro '__compiletime_assert'
     491 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:510:9: note: in expansion of macro '_compiletime_assert'
     510 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
      39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:100:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
     100 |         BUILD_BUG_ON_MSG(!__types_ok(x,y,ux,uy),        \
         |         ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:105:9: note: in expansion of macro '__careful_cmp_once'
     105 |         __careful_cmp_once(op, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_))
         |         ^~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:129:25: note: in expansion of macro '__careful_cmp'
     129 | #define min(x, y)       __careful_cmp(min, x, y)
         |                         ^~~~~~~~~~~~~
   drivers/gpu/drm/panthor/panthor_sched.c:2882:19: note: in expansion of macro 'min'
    2882 |         written = min(ringbuf_size - start, size);
         |                   ^~~


vim +/__compiletime_assert_435 +510 include/linux/compiler_types.h

eb5c2d4b45e3d2 Will Deacon 2020-07-21  496  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  497  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21  498  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  499  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  500  /**
eb5c2d4b45e3d2 Will Deacon 2020-07-21  501   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  502   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2 Will Deacon 2020-07-21  503   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  504   *
eb5c2d4b45e3d2 Will Deacon 2020-07-21  505   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  506   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  507   * compiler has support to do so.
eb5c2d4b45e3d2 Will Deacon 2020-07-21  508   */
eb5c2d4b45e3d2 Will Deacon 2020-07-21  509  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21 @510  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  511

Liviu Dudau Sept. 4, 2024, 6:55 p.m. UTC | #4

On Tue, Sep 03, 2024 at 09:25:35PM +0100, Adrián Larumbe wrote:
> Enable calculations of job submission times in clock cycles and wall
> time. This is done by expanding the boilerplate command stream when running
> a job to include instructions that compute said times right before an after

s/an/and/

> a user CS.
> 
> A separate kernel BO is created per queue to store those values. Jobs can
> access their sampled data through a slots buffer-specific index different

s/slots/slot's/ ?

> from that of the queue's ringbuffer. The reason for this is saving memory
> on the profiling information kernel BO, since the amount of simultaneous
> profiled jobs we can write into the queue's ringbuffer might be much
> smaller than for regular jobs, as the former take more CSF instructions.
> 
> This commit is done in preparation for enabling DRM fdinfo support in the
> Panthor driver, which depends on the numbers calculated herein.
> 
> A profile mode mask has been added that will in a future commit allow UM to
> toggle performance metric sampling behaviour, which is disabled by default
> to save power. When a ringbuffer CS is constructed, timestamp and cycling
> sampling instructions are added depending on the enabled flags in the
> profiling mask.
> 
> A helper was provided that calculates the number of instructions for a
> given set of enablement mask, and these are passed as the number of credits
> when initialising a DRM scheduler job.
> 
> Signed-off-by: Adrián Larumbe <[e-mail]>
> ---
>  drivers/gpu/drm/panthor/panthor_device.h |  22 ++
>  drivers/gpu/drm/panthor/panthor_sched.c  | 327 ++++++++++++++++++++---
>  2 files changed, 305 insertions(+), 44 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_device.h b/drivers/gpu/drm/panthor/panthor_device.h
> index e388c0472ba7..a48e30d0af30 100644
> --- a/drivers/gpu/drm/panthor/panthor_device.h
> +++ b/drivers/gpu/drm/panthor/panthor_device.h
> @@ -66,6 +66,25 @@ struct panthor_irq {
>  	atomic_t suspended;
>  };
>  
> +/**
> + * enum panthor_device_profiling_mode - Profiling state
> + */
> +enum panthor_device_profiling_flags {
> +	/** @PANTHOR_DEVICE_PROFILING_DISABLED: Profiling is disabled. */
> +	PANTHOR_DEVICE_PROFILING_DISABLED = 0,
> +
> +	/** @PANTHOR_DEVICE_PROFILING_CYCLES: Sampling job cycles. */
> +	PANTHOR_DEVICE_PROFILING_CYCLES = BIT(0),
> +
> +	/** @PANTHOR_DEVICE_PROFILING_TIMESTAMP: Sampling job timestamp. */
> +	PANTHOR_DEVICE_PROFILING_TIMESTAMP = BIT(1),
> +
> +	/** @PANTHOR_DEVICE_PROFILING_ALL: Sampling everything. */
> +	PANTHOR_DEVICE_PROFILING_ALL =
> +	PANTHOR_DEVICE_PROFILING_CYCLES |
> +	PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> +};
> +
>  /**
>   * struct panthor_device - Panthor device
>   */
> @@ -162,6 +181,9 @@ struct panthor_device {
>  		 */
>  		struct page *dummy_latest_flush;
>  	} pm;
> +
> +	/** @profile_mask: User-set profiling flags for job accounting. */
> +	u32 profile_mask;
>  };
>  
>  /**
> diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c
> index c426a392b081..b087648bf59a 100644
> --- a/drivers/gpu/drm/panthor/panthor_sched.c
> +++ b/drivers/gpu/drm/panthor/panthor_sched.c
> @@ -93,6 +93,9 @@
>  #define MIN_CSGS				3
>  #define MAX_CSG_PRIO				0xf
>  
> +#define NUM_INSTRS_PER_CACHE_LINE		(64 / sizeof(u64))
> +#define MAX_INSTRS_PER_JOB			32
> +
>  struct panthor_group;
>  
>  /**
> @@ -476,6 +479,18 @@ struct panthor_queue {
>  		 */
>  		struct list_head in_flight_jobs;
>  	} fence_ctx;
> +
> +	/** @profiling_info: Job profiling data slots and access information. */
> +	struct {
> +		/** @slots: Kernel BO holding the slots. */
> +		struct panthor_kernel_bo *slots;
> +
> +		/** @slot_count: Number of jobs ringbuffer can hold at once. */
> +		u32 slot_count;
> +
> +		/** @profiling_seqno: Index of the next available profiling information slot. */
> +		u32 profiling_seqno;
> +	} profiling_info;
>  };
>  
>  /**
> @@ -661,6 +676,18 @@ struct panthor_group {
>  	struct list_head wait_node;
>  };
>  
> +struct panthor_job_profiling_data {
> +	struct {
> +		u64 before;
> +		u64 after;
> +	} cycles;
> +
> +	struct {
> +		u64 before;
> +		u64 after;
> +	} time;
> +};
> +
>  /**
>   * group_queue_work() - Queue a group work
>   * @group: Group to queue the work for.
> @@ -774,6 +801,12 @@ struct panthor_job {
>  
>  	/** @done_fence: Fence signaled when the job is finished or cancelled. */
>  	struct dma_fence *done_fence;
> +
> +	/** @profile_mask: Current device job profiling enablement bitmask. */
> +	u32 profile_mask;
> +
> +	/** @profile_slot: Job profiling information index in the profiling slots BO. */
> +	u32 profiling_slot;
>  };
>  
>  static void
> @@ -838,6 +871,7 @@ static void group_free_queue(struct panthor_group *group, struct panthor_queue *
>  
>  	panthor_kernel_bo_destroy(queue->ringbuf);
>  	panthor_kernel_bo_destroy(queue->iface.mem);
> +	panthor_kernel_bo_destroy(queue->profiling_info.slots);
>  
>  	/* Release the last_fence we were holding, if any. */
>  	dma_fence_put(queue->fence_ctx.last_fence);
> @@ -1982,8 +2016,6 @@ tick_ctx_init(struct panthor_scheduler *sched,
>  	}
>  }
>  
> -#define NUM_INSTRS_PER_SLOT		16
> -
>  static void
>  group_term_post_processing(struct panthor_group *group)
>  {
> @@ -2815,65 +2847,211 @@ static void group_sync_upd_work(struct work_struct *work)
>  	group_put(group);
>  }
>  
> -static struct dma_fence *
> -queue_run_job(struct drm_sched_job *sched_job)
> +struct panthor_job_ringbuf_instrs {
> +	u64 buffer[MAX_INSTRS_PER_JOB];
> +	u32 count;
> +};
> +
> +struct panthor_job_instr {
> +	u32 profile_mask;
> +	u64 instr;
> +};
> +
> +#define JOB_INSTR(__prof, __instr) \
> +	{ \
> +		.profile_mask = __prof, \
> +		.instr = __instr, \
> +	}
> +
> +static void
> +copy_instrs_to_ringbuf(struct panthor_queue *queue,
> +		       struct panthor_job *job,
> +		       struct panthor_job_ringbuf_instrs *instrs)
> +{
> +	ssize_t ringbuf_size = panthor_kernel_bo_size(queue->ringbuf);
> +	u32 start = job->ringbuf.start & (ringbuf_size - 1);
> +	ssize_t size, written;
> +
> +	/*
> +	 * We need to write a whole slot, including any trailing zeroes
> +	 * that may come at the end of it. Also, because instrs.buffer had

s/had/has/

> +	 * been zero-initialised, there's no need to pad it with 0's
> +	 */
> +	instrs->count = ALIGN(instrs->count, NUM_INSTRS_PER_CACHE_LINE);
> +	size = instrs->count * sizeof(u64);
> +	written = min(ringbuf_size - start, size);
> +
> +	memcpy(queue->ringbuf->kmap + start, instrs->buffer, written);
> +
> +	if (written < size)
> +		memcpy(queue->ringbuf->kmap,
> +		       &instrs->buffer[(ringbuf_size - start)/sizeof(u64)],
> +		       size - written);
> +}
> +
> +struct panthor_job_cs_params {
> +	u32 profile_mask;
> +	u64 addr_reg; u64 val_reg;
> +	u64 cycle_reg; u64 time_reg;
> +	u64 sync_addr; u64 times_addr;
> +	u64 cs_start; u64 cs_size;
> +	u32 last_flush; u32 waitall_mask;
> +};
> +
> +static void
> +get_job_cs_params(struct panthor_job *job, struct panthor_job_cs_params *params)
>  {
> -	struct panthor_job *job = container_of(sched_job, struct panthor_job, base);
>  	struct panthor_group *group = job->group;
>  	struct panthor_queue *queue = group->queues[job->queue_idx];
>  	struct panthor_device *ptdev = group->ptdev;
>  	struct panthor_scheduler *sched = ptdev->scheduler;
> -	u32 ringbuf_size = panthor_kernel_bo_size(queue->ringbuf);
> -	u32 ringbuf_insert = queue->iface.input->insert & (ringbuf_size - 1);
> -	u64 addr_reg = ptdev->csif_info.cs_reg_count -
> -		       ptdev->csif_info.unpreserved_cs_reg_count;
> -	u64 val_reg = addr_reg + 2;
> -	u64 sync_addr = panthor_kernel_bo_gpuva(group->syncobjs) +
> -			job->queue_idx * sizeof(struct panthor_syncobj_64b);
> -	u32 waitall_mask = GENMASK(sched->sb_slot_count - 1, 0);
> -	struct dma_fence *done_fence;
> -	int ret;
>  
> -	u64 call_instrs[NUM_INSTRS_PER_SLOT] = {
> +	params->addr_reg = ptdev->csif_info.cs_reg_count -
> +			   ptdev->csif_info.unpreserved_cs_reg_count;
> +	params->val_reg = params->addr_reg + 2;
> +	params->cycle_reg = params->addr_reg;
> +	params->time_reg = params->val_reg;
> +
> +	params->sync_addr = panthor_kernel_bo_gpuva(group->syncobjs) +
> +			    job->queue_idx * sizeof(struct panthor_syncobj_64b);
> +	params->times_addr = panthor_kernel_bo_gpuva(queue->profiling_info.slots) +
> +			     (job->profiling_slot * sizeof(struct panthor_job_profiling_data));
> +	params->waitall_mask = GENMASK(sched->sb_slot_count - 1, 0);
> +
> +	params->cs_start = job->call_info.start;
> +	params->cs_size = job->call_info.size;
> +	params->last_flush = job->call_info.latest_flush;
> +
> +	params->profile_mask = job->profile_mask;
> +}
> +
> +static void
> +prepare_job_instrs(const struct panthor_job_cs_params *params,
> +		   struct panthor_job_ringbuf_instrs *instrs)
> +{
> +	const struct panthor_job_instr instr_seq[] = {
>  		/* MOV32 rX+2, cs.latest_flush */
> -		(2ull << 56) | (val_reg << 48) | job->call_info.latest_flush,
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (2ull << 56) | (params->val_reg << 48) | params->last_flush),
>  
>  		/* FLUSH_CACHE2.clean_inv_all.no_wait.signal(0) rX+2 */
> -		(36ull << 56) | (0ull << 48) | (val_reg << 40) | (0 << 16) | 0x233,
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (36ull << 56) | (0ull << 48) | (params->val_reg << 40) | (0 << 16) | 0x233),
> +
> +		/* MOV48 rX:rX+1, cycles_offset */
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
> +			  (1ull << 56) | (params->cycle_reg << 48) |
> +			  (params->times_addr +
> +			   offsetof(struct panthor_job_profiling_data, cycles.before))),
> +		/* STORE_STATE cycles */
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
> +			  (40ull << 56) | (params->cycle_reg << 40) | (1ll << 32)),
> +		/* MOV48 rX:rX+1, time_offset */
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> +			  (1ull << 56) | (params->time_reg << 48) |
> +			  (params->times_addr +
> +			   offsetof(struct panthor_job_profiling_data, time.before))),
> +		/* STORE_STATE timer */
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> +			  (40ull << 56) | (params->time_reg << 40) | (0ll << 32)),
>  
>  		/* MOV48 rX:rX+1, cs.start */
> -		(1ull << 56) | (addr_reg << 48) | job->call_info.start,
> -
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (1ull << 56) | (params->addr_reg << 48) | params->cs_start),
>  		/* MOV32 rX+2, cs.size */
> -		(2ull << 56) | (val_reg << 48) | job->call_info.size,
> -
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (2ull << 56) | (params->val_reg << 48) | params->cs_size),
>  		/* WAIT(0) => waits for FLUSH_CACHE2 instruction */
> -		(3ull << 56) | (1 << 16),
> -
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED, (3ull << 56) | (1 << 16)),
>  		/* CALL rX:rX+1, rX+2 */
> -		(32ull << 56) | (addr_reg << 40) | (val_reg << 32),
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (32ull << 56) | (params->addr_reg << 40) | (params->val_reg << 32)),
> +
> +		/* MOV48 rX:rX+1, cycles_offset */
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
> +			  (1ull << 56) | (params->cycle_reg << 48) |
> +			  (params->times_addr +
> +			   offsetof(struct panthor_job_profiling_data, cycles.after))),
> +		/* STORE_STATE cycles */
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
> +			  (40ull << 56) | (params->cycle_reg << 40) | (1ll << 32)),
> +
> +		/* MOV48 rX:rX+1, time_offset */
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> +			  (1ull << 56) | (params->time_reg << 48) |
> +			  (params->times_addr +
> +			   offsetof(struct panthor_job_profiling_data, time.after))),
> +		/* STORE_STATE timer */
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> +			  (40ull << 56) | (params->time_reg << 40) | (0ll << 32)),
>  
>  		/* MOV48 rX:rX+1, sync_addr */
> -		(1ull << 56) | (addr_reg << 48) | sync_addr,
> -
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (1ull << 56) | (params->addr_reg << 48) | params->sync_addr),
>  		/* MOV48 rX+2, #1 */
> -		(1ull << 56) | (val_reg << 48) | 1,
> -
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (1ull << 56) | (params->val_reg << 48) | 1),
>  		/* WAIT(all) */
> -		(3ull << 56) | (waitall_mask << 16),
> -
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (3ull << 56) | (params->waitall_mask << 16)),
>  		/* SYNC_ADD64.system_scope.propage_err.nowait rX:rX+1, rX+2*/
> -		(51ull << 56) | (0ull << 48) | (addr_reg << 40) | (val_reg << 32) | (0 << 16) | 1,
> -
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> +			  (51ull << 56) | (0ull << 48) | (params->addr_reg << 40) |
> +			  (params->val_reg << 32) | (0 << 16) | 1),
>  		/* ERROR_BARRIER, so we can recover from faults at job
>  		 * boundaries.
>  		 */
> -		(47ull << 56),
> +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED, (47ull << 56)),
> +	};
> +	u32 pad;
> +
> +	/* NEED to be cacheline aligned to please the prefetcher. */
> +	static_assert(sizeof(instrs->buffer) % 64 == 0,
> +		      "panthor_job_ringbuf_instrs::buffer is not aligned on a cacheline");
> +
> +	/* Make sure we have enough storage to store the whole sequence. */
> +	static_assert(ALIGN(ARRAY_SIZE(instr_seq), NUM_INSTRS_PER_CACHE_LINE) <=
> +		      ARRAY_SIZE(instrs->buffer),
> +		      "instr_seq vs panthor_job_ringbuf_instrs::buffer size mismatch");
> +
> +	for (u32 i = 0; i < ARRAY_SIZE(instr_seq); i++) {
> +		/* If the profile mask of this instruction is not enabled, skip it. */
> +		if (instr_seq[i].profile_mask &&
> +		    !(instr_seq[i].profile_mask & params->profile_mask))
> +			continue;
> +
> +		instrs->buffer[instrs->count++] = instr_seq[i].instr;
> +	}
> +
> +	pad = ALIGN(instrs->count, NUM_INSTRS_PER_CACHE_LINE);
> +	memset(&instrs->buffer[instrs->count], 0,
> +	       (pad - instrs->count) * sizeof(instrs->buffer[0]));
> +	instrs->count = pad;
> +}
> +
> +static u32 calc_job_credits(u32 profile_mask)
> +{
> +	struct panthor_job_ringbuf_instrs instrs;
> +	struct panthor_job_cs_params params = {
> +		.profile_mask = profile_mask,
>  	};
>  
> -	/* Need to be cacheline aligned to please the prefetcher. */
> -	static_assert(sizeof(call_instrs) % 64 == 0,
> -		      "call_instrs is not aligned on a cacheline");
> +	prepare_job_instrs(&params, &instrs);
> +	return instrs.count;
> +}
> +
> +static struct dma_fence *
> +queue_run_job(struct drm_sched_job *sched_job)
> +{
> +	struct panthor_job *job = container_of(sched_job, struct panthor_job, base);
> +	struct panthor_group *group = job->group;
> +	struct panthor_queue *queue = group->queues[job->queue_idx];
> +	struct panthor_device *ptdev = group->ptdev;
> +	struct panthor_scheduler *sched = ptdev->scheduler;
> +	struct panthor_job_ringbuf_instrs instrs;
> +	struct panthor_job_cs_params cs_params;
> +	struct dma_fence *done_fence;
> +	int ret;
>  
>  	/* Stream size is zero, nothing to do except making sure all previously
>  	 * submitted jobs are done before we signal the
> @@ -2900,17 +3078,23 @@ queue_run_job(struct drm_sched_job *sched_job)
>  		       queue->fence_ctx.id,
>  		       atomic64_inc_return(&queue->fence_ctx.seqno));
>  
> -	memcpy(queue->ringbuf->kmap + ringbuf_insert,
> -	       call_instrs, sizeof(call_instrs));
> +	job->profiling_slot = queue->profiling_info.profiling_seqno++;
> +	if (queue->profiling_info.profiling_seqno == queue->profiling_info.slot_count)
> +		queue->profiling_info.profiling_seqno = 0;
> +
> +	job->ringbuf.start = queue->iface.input->insert;
> +
> +	get_job_cs_params(job, &cs_params);
> +	prepare_job_instrs(&cs_params, &instrs);
> +	copy_instrs_to_ringbuf(queue, job, &instrs);
> +
> +	job->ringbuf.end = job->ringbuf.start + (instrs.count * sizeof(u64));
>  
>  	panthor_job_get(&job->base);
>  	spin_lock(&queue->fence_ctx.lock);
>  	list_add_tail(&job->node, &queue->fence_ctx.in_flight_jobs);
>  	spin_unlock(&queue->fence_ctx.lock);
>  
> -	job->ringbuf.start = queue->iface.input->insert;
> -	job->ringbuf.end = job->ringbuf.start + sizeof(call_instrs);
> -
>  	/* Make sure the ring buffer is updated before the INSERT
>  	 * register.
>  	 */
> @@ -3003,6 +3187,24 @@ static const struct drm_sched_backend_ops panthor_queue_sched_ops = {
>  	.free_job = queue_free_job,
>  };
>  
> +static u32 calc_profiling_ringbuf_num_slots(struct panthor_device *ptdev,
> +				       u32 cs_ringbuf_size)
> +{
> +	u32 min_profiled_job_instrs = U32_MAX;
> +	u32 last_flag = fls(PANTHOR_DEVICE_PROFILING_ALL);
> +
> +	for (u32 i = 0; i < last_flag; i++) {
> +		if (BIT(i) & PANTHOR_DEVICE_PROFILING_ALL)
> +			min_profiled_job_instrs =
> +				min(min_profiled_job_instrs, calc_job_credits(BIT(i)));
> +	}
> +
> +	drm_WARN_ON(&ptdev->base,
> +		    !IS_ALIGNED(min_profiled_job_instrs, NUM_INSTRS_PER_CACHE_LINE));
> +
> +	return DIV_ROUND_UP(cs_ringbuf_size, min_profiled_job_instrs * sizeof(u64));
> +}
> +
>  static struct panthor_queue *
>  group_create_queue(struct panthor_group *group,
>  		   const struct drm_panthor_queue_create *args)
> @@ -3056,9 +3258,38 @@ group_create_queue(struct panthor_group *group,
>  		goto err_free_queue;
>  	}
>  
> +	queue->profiling_info.slot_count =
> +		calc_profiling_ringbuf_num_slots(group->ptdev, args->ringbuf_size);
> +
> +	queue->profiling_info.slots =
> +		panthor_kernel_bo_create(group->ptdev, group->vm,
> +					 queue->profiling_info.slot_count *
> +					 sizeof(struct panthor_job_profiling_data),
> +					 DRM_PANTHOR_BO_NO_MMAP,
> +					 DRM_PANTHOR_VM_BIND_OP_MAP_NOEXEC |
> +					 DRM_PANTHOR_VM_BIND_OP_MAP_UNCACHED,
> +					 PANTHOR_VM_KERNEL_AUTO_VA);
> +
> +	if (IS_ERR(queue->profiling_info.slots)) {
> +		ret = PTR_ERR(queue->profiling_info.slots);
> +		goto err_free_queue;
> +	}
> +
> +	ret = panthor_kernel_bo_vmap(queue->profiling_info.slots);
> +	if (ret)
> +		goto err_free_queue;
> +
> +	memset(queue->profiling_info.slots->kmap, 0,
> +	       queue->profiling_info.slot_count * sizeof(struct panthor_job_profiling_data));
> +
> +	/*
> +	 * Credit limit argument tells us the total number of instructions
> +	 * across all CS slots in the ringbuffer, with some jobs requiring
> +	 * twice as many as others, depending on their profiling status.
> +	 */
>  	ret = drm_sched_init(&queue->scheduler, &panthor_queue_sched_ops,
>  			     group->ptdev->scheduler->wq, 1,
> -			     args->ringbuf_size / (NUM_INSTRS_PER_SLOT * sizeof(u64)),
> +			     args->ringbuf_size / sizeof(u64),
>  			     0, msecs_to_jiffies(JOB_TIMEOUT_MS),
>  			     group->ptdev->reset.wq,
>  			     NULL, "panthor-queue", group->ptdev->base.dev);
> @@ -3354,6 +3585,7 @@ panthor_job_create(struct panthor_file *pfile,
>  {
>  	struct panthor_group_pool *gpool = pfile->groups;
>  	struct panthor_job *job;
> +	u32 credits;
>  	int ret;
>  
>  	if (qsubmit->pad)
> @@ -3407,9 +3639,16 @@ panthor_job_create(struct panthor_file *pfile,
>  		}
>  	}
>  
> +	job->profile_mask = pfile->ptdev->profile_mask;
> +	credits = calc_job_credits(job->profile_mask);
> +	if (credits == 0) {
> +		ret = -EINVAL;
> +		goto err_put_job;
> +	}
> +
>  	ret = drm_sched_job_init(&job->base,
>  				 &job->group->queues[job->queue_idx]->entity,
> -				 1, job->group);
> +				 credits, job->group);
>  	if (ret)
>  		goto err_put_job;
>  
> -- 
> 2.46.0
> 

Reviewed-by: Liviu Dudau <[e-mail]>

Best regards,
Liviu

Adrián Larumbe Sept. 12, 2024, 3:03 p.m. UTC | #5

Hi Boris, thanks for the remarks,

On 04.09.2024 09:49, Boris Brezillon wrote:
> On Tue,  3 Sep 2024 21:25:35 +0100
> Adrián Larumbe <[e-mail]> wrote:
> 
> > Enable calculations of job submission times in clock cycles and wall
> > time. This is done by expanding the boilerplate command stream when running
> > a job to include instructions that compute said times right before an after
> > a user CS.
> > 
> > A separate kernel BO is created per queue to store those values. Jobs can
> > access their sampled data through a slots buffer-specific index different
> > from that of the queue's ringbuffer. The reason for this is saving memory
> > on the profiling information kernel BO, since the amount of simultaneous
> > profiled jobs we can write into the queue's ringbuffer might be much
> > smaller than for regular jobs, as the former take more CSF instructions.
> > 
> > This commit is done in preparation for enabling DRM fdinfo support in the
> > Panthor driver, which depends on the numbers calculated herein.
> > 
> > A profile mode mask has been added that will in a future commit allow UM to
> > toggle performance metric sampling behaviour, which is disabled by default
> > to save power. When a ringbuffer CS is constructed, timestamp and cycling
> > sampling instructions are added depending on the enabled flags in the
> > profiling mask.
> > 
> > A helper was provided that calculates the number of instructions for a
> > given set of enablement mask, and these are passed as the number of credits
> > when initialising a DRM scheduler job.
> > 
> > Signed-off-by: Adrián Larumbe <[e-mail]>
> > ---
> >  drivers/gpu/drm/panthor/panthor_device.h |  22 ++
> >  drivers/gpu/drm/panthor/panthor_sched.c  | 327 ++++++++++++++++++++---
> >  2 files changed, 305 insertions(+), 44 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/panthor/panthor_device.h b/drivers/gpu/drm/panthor/panthor_device.h
> > index e388c0472ba7..a48e30d0af30 100644
> > --- a/drivers/gpu/drm/panthor/panthor_device.h
> > +++ b/drivers/gpu/drm/panthor/panthor_device.h
> > @@ -66,6 +66,25 @@ struct panthor_irq {
> >  	atomic_t suspended;
> >  };
> >  
> > +/**
> > + * enum panthor_device_profiling_mode - Profiling state
> > + */
> > +enum panthor_device_profiling_flags {
> > +	/** @PANTHOR_DEVICE_PROFILING_DISABLED: Profiling is disabled. */
> > +	PANTHOR_DEVICE_PROFILING_DISABLED = 0,
> > +
> > +	/** @PANTHOR_DEVICE_PROFILING_CYCLES: Sampling job cycles. */
> > +	PANTHOR_DEVICE_PROFILING_CYCLES = BIT(0),
> > +
> > +	/** @PANTHOR_DEVICE_PROFILING_TIMESTAMP: Sampling job timestamp. */
> > +	PANTHOR_DEVICE_PROFILING_TIMESTAMP = BIT(1),
> > +
> > +	/** @PANTHOR_DEVICE_PROFILING_ALL: Sampling everything. */
> > +	PANTHOR_DEVICE_PROFILING_ALL =
> > +	PANTHOR_DEVICE_PROFILING_CYCLES |
> > +	PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> > +};
> > +
> >  /**
> >   * struct panthor_device - Panthor device
> >   */
> > @@ -162,6 +181,9 @@ struct panthor_device {
> >  		 */
> >  		struct page *dummy_latest_flush;
> >  	} pm;
> > +
> > +	/** @profile_mask: User-set profiling flags for job accounting. */
> > +	u32 profile_mask;
> >  };
> >  
> >  /**
> > diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c
> > index c426a392b081..b087648bf59a 100644
> > --- a/drivers/gpu/drm/panthor/panthor_sched.c
> > +++ b/drivers/gpu/drm/panthor/panthor_sched.c
> > @@ -93,6 +93,9 @@
> >  #define MIN_CSGS				3
> >  #define MAX_CSG_PRIO				0xf
> >  
> > +#define NUM_INSTRS_PER_CACHE_LINE		(64 / sizeof(u64))
> > +#define MAX_INSTRS_PER_JOB			32
> > +
> >  struct panthor_group;
> >  
> >  /**
> > @@ -476,6 +479,18 @@ struct panthor_queue {
> >  		 */
> >  		struct list_head in_flight_jobs;
> >  	} fence_ctx;
> > +
> > +	/** @profiling_info: Job profiling data slots and access information. */
> > +	struct {
> > +		/** @slots: Kernel BO holding the slots. */
> > +		struct panthor_kernel_bo *slots;
> > +
> > +		/** @slot_count: Number of jobs ringbuffer can hold at once. */
> > +		u32 slot_count;
> > +
> > +		/** @profiling_seqno: Index of the next available profiling information slot. */
> > +		u32 profiling_seqno;
> 
> Nit: no need to repeat profiling as it's under the profiling_info
> struct. I would simply name that one 'seqno'.
> 
> > +	} profiling_info;
> 
> s/profiling_info/profiling/ ?
> 
> >  };
> >  
> >  /**
> > @@ -661,6 +676,18 @@ struct panthor_group {
> >  	struct list_head wait_node;
> >  };
> >  
> > +struct panthor_job_profiling_data {
> > +	struct {
> > +		u64 before;
> > +		u64 after;
> > +	} cycles;
> > +
> > +	struct {
> > +		u64 before;
> > +		u64 after;
> > +	} time;
> > +};
> > +
> >  /**
> >   * group_queue_work() - Queue a group work
> >   * @group: Group to queue the work for.
> > @@ -774,6 +801,12 @@ struct panthor_job {
> >  
> >  	/** @done_fence: Fence signaled when the job is finished or cancelled. */
> >  	struct dma_fence *done_fence;
> > +
> > +	/** @profile_mask: Current device job profiling enablement bitmask. */
> > +	u32 profile_mask;
> > +
> > +	/** @profile_slot: Job profiling information index in the profiling slots BO. */
> > +	u32 profiling_slot;
> 
> Nit: we tend to group fields together under sub-structs, so I'd say:
> 
> 	struct {
> 		u32 mask; // or flags
> 		u32 slot;
> 	} profiling;
> 
> >  };
> >  
> >  static void
> > @@ -838,6 +871,7 @@ static void group_free_queue(struct panthor_group *group, struct panthor_queue *
> >  
> >  	panthor_kernel_bo_destroy(queue->ringbuf);
> >  	panthor_kernel_bo_destroy(queue->iface.mem);
> > +	panthor_kernel_bo_destroy(queue->profiling_info.slots);
> >  
> >  	/* Release the last_fence we were holding, if any. */
> >  	dma_fence_put(queue->fence_ctx.last_fence);
> > @@ -1982,8 +2016,6 @@ tick_ctx_init(struct panthor_scheduler *sched,
> >  	}
> >  }
> >  
> > -#define NUM_INSTRS_PER_SLOT		16
> > -
> >  static void
> >  group_term_post_processing(struct panthor_group *group)
> >  {
> > @@ -2815,65 +2847,211 @@ static void group_sync_upd_work(struct work_struct *work)
> >  	group_put(group);
> >  }
> >  
> > -static struct dma_fence *
> > -queue_run_job(struct drm_sched_job *sched_job)
> > +struct panthor_job_ringbuf_instrs {
> > +	u64 buffer[MAX_INSTRS_PER_JOB];
> > +	u32 count;
> > +};
> > +
> > +struct panthor_job_instr {
> > +	u32 profile_mask;
> > +	u64 instr;
> > +};
> > +
> > +#define JOB_INSTR(__prof, __instr) \
> > +	{ \
> > +		.profile_mask = __prof, \
> > +		.instr = __instr, \
> > +	}
> > +
> > +static void
> > +copy_instrs_to_ringbuf(struct panthor_queue *queue,
> > +		       struct panthor_job *job,
> > +		       struct panthor_job_ringbuf_instrs *instrs)
> > +{
> > +	ssize_t ringbuf_size = panthor_kernel_bo_size(queue->ringbuf);
> > +	u32 start = job->ringbuf.start & (ringbuf_size - 1);
> > +	ssize_t size, written;
> > +
> > +	/*
> > +	 * We need to write a whole slot, including any trailing zeroes
> > +	 * that may come at the end of it. Also, because instrs.buffer had
> > +	 * been zero-initialised, there's no need to pad it with 0's
> > +	 */
> > +	instrs->count = ALIGN(instrs->count, NUM_INSTRS_PER_CACHE_LINE);
> > +	size = instrs->count * sizeof(u64);
> > +	written = min(ringbuf_size - start, size);
> > +
> > +	memcpy(queue->ringbuf->kmap + start, instrs->buffer, written);
> > +
> > +	if (written < size)
> > +		memcpy(queue->ringbuf->kmap,
> > +		       &instrs->buffer[(ringbuf_size - start)/sizeof(u64)],
> > +		       size - written);
> > +}
> > +
> > +struct panthor_job_cs_params {
> > +	u32 profile_mask;
> > +	u64 addr_reg; u64 val_reg;
> > +	u64 cycle_reg; u64 time_reg;
> > +	u64 sync_addr; u64 times_addr;
> > +	u64 cs_start; u64 cs_size;
> > +	u32 last_flush; u32 waitall_mask;
> > +};
> > +
> > +static void
> > +get_job_cs_params(struct panthor_job *job, struct panthor_job_cs_params *params)
> >  {
> > -	struct panthor_job *job = container_of(sched_job, struct panthor_job, base);
> >  	struct panthor_group *group = job->group;
> >  	struct panthor_queue *queue = group->queues[job->queue_idx];
> >  	struct panthor_device *ptdev = group->ptdev;
> >  	struct panthor_scheduler *sched = ptdev->scheduler;
> > -	u32 ringbuf_size = panthor_kernel_bo_size(queue->ringbuf);
> > -	u32 ringbuf_insert = queue->iface.input->insert & (ringbuf_size - 1);
> > -	u64 addr_reg = ptdev->csif_info.cs_reg_count -
> > -		       ptdev->csif_info.unpreserved_cs_reg_count;
> > -	u64 val_reg = addr_reg + 2;
> > -	u64 sync_addr = panthor_kernel_bo_gpuva(group->syncobjs) +
> > -			job->queue_idx * sizeof(struct panthor_syncobj_64b);
> > -	u32 waitall_mask = GENMASK(sched->sb_slot_count - 1, 0);
> > -	struct dma_fence *done_fence;
> > -	int ret;
> >  
> > -	u64 call_instrs[NUM_INSTRS_PER_SLOT] = {
> > +	params->addr_reg = ptdev->csif_info.cs_reg_count -
> > +			   ptdev->csif_info.unpreserved_cs_reg_count;
> > +	params->val_reg = params->addr_reg + 2;
> > +	params->cycle_reg = params->addr_reg;
> > +	params->time_reg = params->val_reg;
> > +
> > +	params->sync_addr = panthor_kernel_bo_gpuva(group->syncobjs) +
> > +			    job->queue_idx * sizeof(struct panthor_syncobj_64b);
> > +	params->times_addr = panthor_kernel_bo_gpuva(queue->profiling_info.slots) +
> > +			     (job->profiling_slot * sizeof(struct panthor_job_profiling_data));
> > +	params->waitall_mask = GENMASK(sched->sb_slot_count - 1, 0);
> > +
> > +	params->cs_start = job->call_info.start;
> > +	params->cs_size = job->call_info.size;
> > +	params->last_flush = job->call_info.latest_flush;
> > +
> > +	params->profile_mask = job->profile_mask;
> > +}
> > +
> > +static void
> > +prepare_job_instrs(const struct panthor_job_cs_params *params,
> > +		   struct panthor_job_ringbuf_instrs *instrs)
> > +{
> > +	const struct panthor_job_instr instr_seq[] = {
> >  		/* MOV32 rX+2, cs.latest_flush */
> > -		(2ull << 56) | (val_reg << 48) | job->call_info.latest_flush,
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > +			  (2ull << 56) | (params->val_reg << 48) | params->last_flush),
> >  
> >  		/* FLUSH_CACHE2.clean_inv_all.no_wait.signal(0) rX+2 */
> > -		(36ull << 56) | (0ull << 48) | (val_reg << 40) | (0 << 16) | 0x233,
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > +			  (36ull << 56) | (0ull << 48) | (params->val_reg << 40) | (0 << 16) | 0x233),
> > +
> > +		/* MOV48 rX:rX+1, cycles_offset */
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
> > +			  (1ull << 56) | (params->cycle_reg << 48) |
> > +			  (params->times_addr +
> > +			   offsetof(struct panthor_job_profiling_data, cycles.before))),
> > +		/* STORE_STATE cycles */
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
> > +			  (40ull << 56) | (params->cycle_reg << 40) | (1ll << 32)),
> > +		/* MOV48 rX:rX+1, time_offset */
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> > +			  (1ull << 56) | (params->time_reg << 48) |
> > +			  (params->times_addr +
> > +			   offsetof(struct panthor_job_profiling_data, time.before))),
> > +		/* STORE_STATE timer */
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> > +			  (40ull << 56) | (params->time_reg << 40) | (0ll << 32)),
> >  
> >  		/* MOV48 rX:rX+1, cs.start */
> > -		(1ull << 56) | (addr_reg << 48) | job->call_info.start,
> > -
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > +			  (1ull << 56) | (params->addr_reg << 48) | params->cs_start),
> >  		/* MOV32 rX+2, cs.size */
> > -		(2ull << 56) | (val_reg << 48) | job->call_info.size,
> > -
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > +			  (2ull << 56) | (params->val_reg << 48) | params->cs_size),
> >  		/* WAIT(0) => waits for FLUSH_CACHE2 instruction */
> > -		(3ull << 56) | (1 << 16),
> > -
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED, (3ull << 56) | (1 << 16)),
> >  		/* CALL rX:rX+1, rX+2 */
> > -		(32ull << 56) | (addr_reg << 40) | (val_reg << 32),
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > +			  (32ull << 56) | (params->addr_reg << 40) | (params->val_reg << 32)),
> > +
> > +		/* MOV48 rX:rX+1, cycles_offset */
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
> > +			  (1ull << 56) | (params->cycle_reg << 48) |
> > +			  (params->times_addr +
> > +			   offsetof(struct panthor_job_profiling_data, cycles.after))),
> > +		/* STORE_STATE cycles */
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
> > +			  (40ull << 56) | (params->cycle_reg << 40) | (1ll << 32)),
> > +
> > +		/* MOV48 rX:rX+1, time_offset */
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> > +			  (1ull << 56) | (params->time_reg << 48) |
> > +			  (params->times_addr +
> > +			   offsetof(struct panthor_job_profiling_data, time.after))),
> > +		/* STORE_STATE timer */
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> > +			  (40ull << 56) | (params->time_reg << 40) | (0ll << 32)),
> >  
> >  		/* MOV48 rX:rX+1, sync_addr */
> > -		(1ull << 56) | (addr_reg << 48) | sync_addr,
> > -
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > +			  (1ull << 56) | (params->addr_reg << 48) | params->sync_addr),
> >  		/* MOV48 rX+2, #1 */
> > -		(1ull << 56) | (val_reg << 48) | 1,
> > -
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > +			  (1ull << 56) | (params->val_reg << 48) | 1),
> >  		/* WAIT(all) */
> > -		(3ull << 56) | (waitall_mask << 16),
> > -
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > +			  (3ull << 56) | (params->waitall_mask << 16)),
> >  		/* SYNC_ADD64.system_scope.propage_err.nowait rX:rX+1, rX+2*/
> > -		(51ull << 56) | (0ull << 48) | (addr_reg << 40) | (val_reg << 32) | (0 << 16) | 1,
> > -
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > +			  (51ull << 56) | (0ull << 48) | (params->addr_reg << 40) |
> > +			  (params->val_reg << 32) | (0 << 16) | 1),
> >  		/* ERROR_BARRIER, so we can recover from faults at job
> >  		 * boundaries.
> >  		 */
> > -		(47ull << 56),
> > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED, (47ull << 56)),
> > +	};
> > +	u32 pad;
> > +
> > +	/* NEED to be cacheline aligned to please the prefetcher. */
> > +	static_assert(sizeof(instrs->buffer) % 64 == 0,
> > +		      "panthor_job_ringbuf_instrs::buffer is not aligned on a cacheline");
> > +
> > +	/* Make sure we have enough storage to store the whole sequence. */
> > +	static_assert(ALIGN(ARRAY_SIZE(instr_seq), NUM_INSTRS_PER_CACHE_LINE) <=
> > +		      ARRAY_SIZE(instrs->buffer),
> > +		      "instr_seq vs panthor_job_ringbuf_instrs::buffer size mismatch");
> 
> We probably want to catch situations where instrs->buffer has gone
> bigger than needed (say we found a way to drop instructions), so I
> would turn the '<=' condition into an '=='.

I did this but it's triggering the static assert, because the instr_seq array has 19 elements,
which when aligned to NUM_INSTRS_PER_CACHE_LINE (8 I think) renders 24, still less than the
32 slots in instrs->buffer. Having a slightly oversized instrs.buffer array isn't a problem
though because instrs.count is being used when copying them into the ringbuffer, so I think
leaving this assert as an <= should be alright. 

> > +
> > +	for (u32 i = 0; i < ARRAY_SIZE(instr_seq); i++) {
> > +		/* If the profile mask of this instruction is not enabled, skip it. */
> > +		if (instr_seq[i].profile_mask &&
> > +		    !(instr_seq[i].profile_mask & params->profile_mask))
> > +			continue;
> > +
> > +		instrs->buffer[instrs->count++] = instr_seq[i].instr;
> > +	}
> > +
> > +	pad = ALIGN(instrs->count, NUM_INSTRS_PER_CACHE_LINE);
> > +	memset(&instrs->buffer[instrs->count], 0,
> > +	       (pad - instrs->count) * sizeof(instrs->buffer[0]));
> > +	instrs->count = pad;
> > +}
> > +
> > +static u32 calc_job_credits(u32 profile_mask)
> > +{
> > +	struct panthor_job_ringbuf_instrs instrs;
> > +	struct panthor_job_cs_params params = {
> > +		.profile_mask = profile_mask,
> >  	};
> >  
> > -	/* Need to be cacheline aligned to please the prefetcher. */
> > -	static_assert(sizeof(call_instrs) % 64 == 0,
> > -		      "call_instrs is not aligned on a cacheline");
> > +	prepare_job_instrs(&params, &instrs);
> > +	return instrs.count;
> > +}
> > +
> > +static struct dma_fence *
> > +queue_run_job(struct drm_sched_job *sched_job)
> > +{
> > +	struct panthor_job *job = container_of(sched_job, struct panthor_job, base);
> > +	struct panthor_group *group = job->group;
> > +	struct panthor_queue *queue = group->queues[job->queue_idx];
> > +	struct panthor_device *ptdev = group->ptdev;
> > +	struct panthor_scheduler *sched = ptdev->scheduler;
> > +	struct panthor_job_ringbuf_instrs instrs;
> > +	struct panthor_job_cs_params cs_params;
> > +	struct dma_fence *done_fence;
> > +	int ret;
> >  
> >  	/* Stream size is zero, nothing to do except making sure all previously
> >  	 * submitted jobs are done before we signal the
> > @@ -2900,17 +3078,23 @@ queue_run_job(struct drm_sched_job *sched_job)
> >  		       queue->fence_ctx.id,
> >  		       atomic64_inc_return(&queue->fence_ctx.seqno));
> >  
> > -	memcpy(queue->ringbuf->kmap + ringbuf_insert,
> > -	       call_instrs, sizeof(call_instrs));
> > +	job->profiling_slot = queue->profiling_info.profiling_seqno++;
> > +	if (queue->profiling_info.profiling_seqno == queue->profiling_info.slot_count)
> > +		queue->profiling_info.profiling_seqno = 0;
> > +
> > +	job->ringbuf.start = queue->iface.input->insert;
> > +
> > +	get_job_cs_params(job, &cs_params);
> > +	prepare_job_instrs(&cs_params, &instrs);
> > +	copy_instrs_to_ringbuf(queue, job, &instrs);
> > +
> > +	job->ringbuf.end = job->ringbuf.start + (instrs.count * sizeof(u64));
> >  
> >  	panthor_job_get(&job->base);
> >  	spin_lock(&queue->fence_ctx.lock);
> >  	list_add_tail(&job->node, &queue->fence_ctx.in_flight_jobs);
> >  	spin_unlock(&queue->fence_ctx.lock);
> >  
> > -	job->ringbuf.start = queue->iface.input->insert;
> > -	job->ringbuf.end = job->ringbuf.start + sizeof(call_instrs);
> > -
> >  	/* Make sure the ring buffer is updated before the INSERT
> >  	 * register.
> >  	 */
> > @@ -3003,6 +3187,24 @@ static const struct drm_sched_backend_ops panthor_queue_sched_ops = {
> >  	.free_job = queue_free_job,
> >  };
> >  
> > +static u32 calc_profiling_ringbuf_num_slots(struct panthor_device *ptdev,
> > +				       u32 cs_ringbuf_size)
> > +{
> > +	u32 min_profiled_job_instrs = U32_MAX;
> > +	u32 last_flag = fls(PANTHOR_DEVICE_PROFILING_ALL);
> > +
> > +	for (u32 i = 0; i < last_flag; i++) {
> > +		if (BIT(i) & PANTHOR_DEVICE_PROFILING_ALL)
> > +			min_profiled_job_instrs =
> > +				min(min_profiled_job_instrs, calc_job_credits(BIT(i)));
> > +	}
> 
> Okay, I think this loop deserves an explanation. The goal is to
> calculate the minimal size of a profile job so we can deduce the
> maximum number of profiling slots that will be used simultaneously. We
> ignore PANTHOR_DEVICE_PROFILING_DISABLED, because those jobs won't use
> a profiling slot in the first place.
> 
> > +
> > +	drm_WARN_ON(&ptdev->base,
> > +		    !IS_ALIGNED(min_profiled_job_instrs, NUM_INSTRS_PER_CACHE_LINE));
> 
> We can probably drop this WARN_ON(), it's supposed to be checked in
> calc_job_credits().
> 
> > +
> > +	return DIV_ROUND_UP(cs_ringbuf_size, min_profiled_job_instrs * sizeof(u64));
> > +}
> > +
> >  static struct panthor_queue *
> >  group_create_queue(struct panthor_group *group,
> >  		   const struct drm_panthor_queue_create *args)
> > @@ -3056,9 +3258,38 @@ group_create_queue(struct panthor_group *group,
> >  		goto err_free_queue;
> >  	}
> >  
> > +	queue->profiling_info.slot_count =
> > +		calc_profiling_ringbuf_num_slots(group->ptdev, args->ringbuf_size);
> > +
> > +	queue->profiling_info.slots =
> > +		panthor_kernel_bo_create(group->ptdev, group->vm,
> > +					 queue->profiling_info.slot_count *
> > +					 sizeof(struct panthor_job_profiling_data),
> > +					 DRM_PANTHOR_BO_NO_MMAP,
> > +					 DRM_PANTHOR_VM_BIND_OP_MAP_NOEXEC |
> > +					 DRM_PANTHOR_VM_BIND_OP_MAP_UNCACHED,
> > +					 PANTHOR_VM_KERNEL_AUTO_VA);
> > +
> > +	if (IS_ERR(queue->profiling_info.slots)) {
> > +		ret = PTR_ERR(queue->profiling_info.slots);
> > +		goto err_free_queue;
> > +	}
> > +
> > +	ret = panthor_kernel_bo_vmap(queue->profiling_info.slots);
> > +	if (ret)
> > +		goto err_free_queue;
> > +
> > +	memset(queue->profiling_info.slots->kmap, 0,
> > +	       queue->profiling_info.slot_count * sizeof(struct panthor_job_profiling_data));
> 
> I don't think we need to memset() the profiling buffer.
> 
> > +
> > +	/*
> > +	 * Credit limit argument tells us the total number of instructions
> > +	 * across all CS slots in the ringbuffer, with some jobs requiring
> > +	 * twice as many as others, depending on their profiling status.
> > +	 */
> >  	ret = drm_sched_init(&queue->scheduler, &panthor_queue_sched_ops,
> >  			     group->ptdev->scheduler->wq, 1,
> > -			     args->ringbuf_size / (NUM_INSTRS_PER_SLOT * sizeof(u64)),
> > +			     args->ringbuf_size / sizeof(u64),
> >  			     0, msecs_to_jiffies(JOB_TIMEOUT_MS),
> >  			     group->ptdev->reset.wq,
> >  			     NULL, "panthor-queue", group->ptdev->base.dev);
> > @@ -3354,6 +3585,7 @@ panthor_job_create(struct panthor_file *pfile,
> >  {
> >  	struct panthor_group_pool *gpool = pfile->groups;
> >  	struct panthor_job *job;
> > +	u32 credits;
> >  	int ret;
> >  
> >  	if (qsubmit->pad)
> > @@ -3407,9 +3639,16 @@ panthor_job_create(struct panthor_file *pfile,
> >  		}
> >  	}
> >  
> > +	job->profile_mask = pfile->ptdev->profile_mask;
> > +	credits = calc_job_credits(job->profile_mask);
> > +	if (credits == 0) {
> > +		ret = -EINVAL;
> > +		goto err_put_job;
> > +	}
> > +
> >  	ret = drm_sched_job_init(&job->base,
> >  				 &job->group->queues[job->queue_idx]->entity,
> > -				 1, job->group);
> > +				 credits, job->group);
> >  	if (ret)
> >  		goto err_put_job;
> >  
> 
> Just add a bunch of minor comments (mostly cosmetic changes), but the
> implementation looks good to me.
> 
> Reviewed-by: Boris Brezillon <[e-mail]>

Adrian Larumbe

Boris Brezillon Sept. 12, 2024, 3:10 p.m. UTC | #6

On Thu, 12 Sep 2024 16:03:37 +0100
Adrián Larumbe <[e-mail]> wrote:

> Hi Boris, thanks for the remarks,
> 
> On 04.09.2024 09:49, Boris Brezillon wrote:
> > On Tue,  3 Sep 2024 21:25:35 +0100
> > Adrián Larumbe <[e-mail]> wrote:
> >   
> > > Enable calculations of job submission times in clock cycles and wall
> > > time. This is done by expanding the boilerplate command stream when running
> > > a job to include instructions that compute said times right before an after
> > > a user CS.
> > > 
> > > A separate kernel BO is created per queue to store those values. Jobs can
> > > access their sampled data through a slots buffer-specific index different
> > > from that of the queue's ringbuffer. The reason for this is saving memory
> > > on the profiling information kernel BO, since the amount of simultaneous
> > > profiled jobs we can write into the queue's ringbuffer might be much
> > > smaller than for regular jobs, as the former take more CSF instructions.
> > > 
> > > This commit is done in preparation for enabling DRM fdinfo support in the
> > > Panthor driver, which depends on the numbers calculated herein.
> > > 
> > > A profile mode mask has been added that will in a future commit allow UM to
> > > toggle performance metric sampling behaviour, which is disabled by default
> > > to save power. When a ringbuffer CS is constructed, timestamp and cycling
> > > sampling instructions are added depending on the enabled flags in the
> > > profiling mask.
> > > 
> > > A helper was provided that calculates the number of instructions for a
> > > given set of enablement mask, and these are passed as the number of credits
> > > when initialising a DRM scheduler job.
> > > 
> > > Signed-off-by: Adrián Larumbe <[e-mail]>
> > > ---
> > >  drivers/gpu/drm/panthor/panthor_device.h |  22 ++
> > >  drivers/gpu/drm/panthor/panthor_sched.c  | 327 ++++++++++++++++++++---
> > >  2 files changed, 305 insertions(+), 44 deletions(-)
> > > 
> > > diff --git a/drivers/gpu/drm/panthor/panthor_device.h b/drivers/gpu/drm/panthor/panthor_device.h
> > > index e388c0472ba7..a48e30d0af30 100644
> > > --- a/drivers/gpu/drm/panthor/panthor_device.h
> > > +++ b/drivers/gpu/drm/panthor/panthor_device.h
> > > @@ -66,6 +66,25 @@ struct panthor_irq {
> > >  	atomic_t suspended;
> > >  };
> > >  
> > > +/**
> > > + * enum panthor_device_profiling_mode - Profiling state
> > > + */
> > > +enum panthor_device_profiling_flags {
> > > +	/** @PANTHOR_DEVICE_PROFILING_DISABLED: Profiling is disabled. */
> > > +	PANTHOR_DEVICE_PROFILING_DISABLED = 0,
> > > +
> > > +	/** @PANTHOR_DEVICE_PROFILING_CYCLES: Sampling job cycles. */
> > > +	PANTHOR_DEVICE_PROFILING_CYCLES = BIT(0),
> > > +
> > > +	/** @PANTHOR_DEVICE_PROFILING_TIMESTAMP: Sampling job timestamp. */
> > > +	PANTHOR_DEVICE_PROFILING_TIMESTAMP = BIT(1),
> > > +
> > > +	/** @PANTHOR_DEVICE_PROFILING_ALL: Sampling everything. */
> > > +	PANTHOR_DEVICE_PROFILING_ALL =
> > > +	PANTHOR_DEVICE_PROFILING_CYCLES |
> > > +	PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> > > +};
> > > +
> > >  /**
> > >   * struct panthor_device - Panthor device
> > >   */
> > > @@ -162,6 +181,9 @@ struct panthor_device {
> > >  		 */
> > >  		struct page *dummy_latest_flush;
> > >  	} pm;
> > > +
> > > +	/** @profile_mask: User-set profiling flags for job accounting. */
> > > +	u32 profile_mask;
> > >  };
> > >  
> > >  /**
> > > diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c
> > > index c426a392b081..b087648bf59a 100644
> > > --- a/drivers/gpu/drm/panthor/panthor_sched.c
> > > +++ b/drivers/gpu/drm/panthor/panthor_sched.c
> > > @@ -93,6 +93,9 @@
> > >  #define MIN_CSGS				3
> > >  #define MAX_CSG_PRIO				0xf
> > >  
> > > +#define NUM_INSTRS_PER_CACHE_LINE		(64 / sizeof(u64))
> > > +#define MAX_INSTRS_PER_JOB			32
> > > +
> > >  struct panthor_group;
> > >  
> > >  /**
> > > @@ -476,6 +479,18 @@ struct panthor_queue {
> > >  		 */
> > >  		struct list_head in_flight_jobs;
> > >  	} fence_ctx;
> > > +
> > > +	/** @profiling_info: Job profiling data slots and access information. */
> > > +	struct {
> > > +		/** @slots: Kernel BO holding the slots. */
> > > +		struct panthor_kernel_bo *slots;
> > > +
> > > +		/** @slot_count: Number of jobs ringbuffer can hold at once. */
> > > +		u32 slot_count;
> > > +
> > > +		/** @profiling_seqno: Index of the next available profiling information slot. */
> > > +		u32 profiling_seqno;  
> > 
> > Nit: no need to repeat profiling as it's under the profiling_info
> > struct. I would simply name that one 'seqno'.
> >   
> > > +	} profiling_info;  
> > 
> > s/profiling_info/profiling/ ?
> >   
> > >  };
> > >  
> > >  /**
> > > @@ -661,6 +676,18 @@ struct panthor_group {
> > >  	struct list_head wait_node;
> > >  };
> > >  
> > > +struct panthor_job_profiling_data {
> > > +	struct {
> > > +		u64 before;
> > > +		u64 after;
> > > +	} cycles;
> > > +
> > > +	struct {
> > > +		u64 before;
> > > +		u64 after;
> > > +	} time;
> > > +};
> > > +
> > >  /**
> > >   * group_queue_work() - Queue a group work
> > >   * @group: Group to queue the work for.
> > > @@ -774,6 +801,12 @@ struct panthor_job {
> > >  
> > >  	/** @done_fence: Fence signaled when the job is finished or cancelled. */
> > >  	struct dma_fence *done_fence;
> > > +
> > > +	/** @profile_mask: Current device job profiling enablement bitmask. */
> > > +	u32 profile_mask;
> > > +
> > > +	/** @profile_slot: Job profiling information index in the profiling slots BO. */
> > > +	u32 profiling_slot;  
> > 
> > Nit: we tend to group fields together under sub-structs, so I'd say:
> > 
> > 	struct {
> > 		u32 mask; // or flags
> > 		u32 slot;
> > 	} profiling;
> >   
> > >  };
> > >  
> > >  static void
> > > @@ -838,6 +871,7 @@ static void group_free_queue(struct panthor_group *group, struct panthor_queue *
> > >  
> > >  	panthor_kernel_bo_destroy(queue->ringbuf);
> > >  	panthor_kernel_bo_destroy(queue->iface.mem);
> > > +	panthor_kernel_bo_destroy(queue->profiling_info.slots);
> > >  
> > >  	/* Release the last_fence we were holding, if any. */
> > >  	dma_fence_put(queue->fence_ctx.last_fence);
> > > @@ -1982,8 +2016,6 @@ tick_ctx_init(struct panthor_scheduler *sched,
> > >  	}
> > >  }
> > >  
> > > -#define NUM_INSTRS_PER_SLOT		16
> > > -
> > >  static void
> > >  group_term_post_processing(struct panthor_group *group)
> > >  {
> > > @@ -2815,65 +2847,211 @@ static void group_sync_upd_work(struct work_struct *work)
> > >  	group_put(group);
> > >  }
> > >  
> > > -static struct dma_fence *
> > > -queue_run_job(struct drm_sched_job *sched_job)
> > > +struct panthor_job_ringbuf_instrs {
> > > +	u64 buffer[MAX_INSTRS_PER_JOB];
> > > +	u32 count;
> > > +};
> > > +
> > > +struct panthor_job_instr {
> > > +	u32 profile_mask;
> > > +	u64 instr;
> > > +};
> > > +
> > > +#define JOB_INSTR(__prof, __instr) \
> > > +	{ \
> > > +		.profile_mask = __prof, \
> > > +		.instr = __instr, \
> > > +	}
> > > +
> > > +static void
> > > +copy_instrs_to_ringbuf(struct panthor_queue *queue,
> > > +		       struct panthor_job *job,
> > > +		       struct panthor_job_ringbuf_instrs *instrs)
> > > +{
> > > +	ssize_t ringbuf_size = panthor_kernel_bo_size(queue->ringbuf);
> > > +	u32 start = job->ringbuf.start & (ringbuf_size - 1);
> > > +	ssize_t size, written;
> > > +
> > > +	/*
> > > +	 * We need to write a whole slot, including any trailing zeroes
> > > +	 * that may come at the end of it. Also, because instrs.buffer had
> > > +	 * been zero-initialised, there's no need to pad it with 0's
> > > +	 */
> > > +	instrs->count = ALIGN(instrs->count, NUM_INSTRS_PER_CACHE_LINE);
> > > +	size = instrs->count * sizeof(u64);
> > > +	written = min(ringbuf_size - start, size);
> > > +
> > > +	memcpy(queue->ringbuf->kmap + start, instrs->buffer, written);
> > > +
> > > +	if (written < size)
> > > +		memcpy(queue->ringbuf->kmap,
> > > +		       &instrs->buffer[(ringbuf_size - start)/sizeof(u64)],
> > > +		       size - written);
> > > +}
> > > +
> > > +struct panthor_job_cs_params {
> > > +	u32 profile_mask;
> > > +	u64 addr_reg; u64 val_reg;
> > > +	u64 cycle_reg; u64 time_reg;
> > > +	u64 sync_addr; u64 times_addr;
> > > +	u64 cs_start; u64 cs_size;
> > > +	u32 last_flush; u32 waitall_mask;
> > > +};
> > > +
> > > +static void
> > > +get_job_cs_params(struct panthor_job *job, struct panthor_job_cs_params *params)
> > >  {
> > > -	struct panthor_job *job = container_of(sched_job, struct panthor_job, base);
> > >  	struct panthor_group *group = job->group;
> > >  	struct panthor_queue *queue = group->queues[job->queue_idx];
> > >  	struct panthor_device *ptdev = group->ptdev;
> > >  	struct panthor_scheduler *sched = ptdev->scheduler;
> > > -	u32 ringbuf_size = panthor_kernel_bo_size(queue->ringbuf);
> > > -	u32 ringbuf_insert = queue->iface.input->insert & (ringbuf_size - 1);
> > > -	u64 addr_reg = ptdev->csif_info.cs_reg_count -
> > > -		       ptdev->csif_info.unpreserved_cs_reg_count;
> > > -	u64 val_reg = addr_reg + 2;
> > > -	u64 sync_addr = panthor_kernel_bo_gpuva(group->syncobjs) +
> > > -			job->queue_idx * sizeof(struct panthor_syncobj_64b);
> > > -	u32 waitall_mask = GENMASK(sched->sb_slot_count - 1, 0);
> > > -	struct dma_fence *done_fence;
> > > -	int ret;
> > >  
> > > -	u64 call_instrs[NUM_INSTRS_PER_SLOT] = {
> > > +	params->addr_reg = ptdev->csif_info.cs_reg_count -
> > > +			   ptdev->csif_info.unpreserved_cs_reg_count;
> > > +	params->val_reg = params->addr_reg + 2;
> > > +	params->cycle_reg = params->addr_reg;
> > > +	params->time_reg = params->val_reg;
> > > +
> > > +	params->sync_addr = panthor_kernel_bo_gpuva(group->syncobjs) +
> > > +			    job->queue_idx * sizeof(struct panthor_syncobj_64b);
> > > +	params->times_addr = panthor_kernel_bo_gpuva(queue->profiling_info.slots) +
> > > +			     (job->profiling_slot * sizeof(struct panthor_job_profiling_data));
> > > +	params->waitall_mask = GENMASK(sched->sb_slot_count - 1, 0);
> > > +
> > > +	params->cs_start = job->call_info.start;
> > > +	params->cs_size = job->call_info.size;
> > > +	params->last_flush = job->call_info.latest_flush;
> > > +
> > > +	params->profile_mask = job->profile_mask;
> > > +}
> > > +
> > > +static void
> > > +prepare_job_instrs(const struct panthor_job_cs_params *params,
> > > +		   struct panthor_job_ringbuf_instrs *instrs)
> > > +{
> > > +	const struct panthor_job_instr instr_seq[] = {
> > >  		/* MOV32 rX+2, cs.latest_flush */
> > > -		(2ull << 56) | (val_reg << 48) | job->call_info.latest_flush,
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > > +			  (2ull << 56) | (params->val_reg << 48) | params->last_flush),
> > >  
> > >  		/* FLUSH_CACHE2.clean_inv_all.no_wait.signal(0) rX+2 */
> > > -		(36ull << 56) | (0ull << 48) | (val_reg << 40) | (0 << 16) | 0x233,
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > > +			  (36ull << 56) | (0ull << 48) | (params->val_reg << 40) | (0 << 16) | 0x233),
> > > +
> > > +		/* MOV48 rX:rX+1, cycles_offset */
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
> > > +			  (1ull << 56) | (params->cycle_reg << 48) |
> > > +			  (params->times_addr +
> > > +			   offsetof(struct panthor_job_profiling_data, cycles.before))),
> > > +		/* STORE_STATE cycles */
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
> > > +			  (40ull << 56) | (params->cycle_reg << 40) | (1ll << 32)),
> > > +		/* MOV48 rX:rX+1, time_offset */
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> > > +			  (1ull << 56) | (params->time_reg << 48) |
> > > +			  (params->times_addr +
> > > +			   offsetof(struct panthor_job_profiling_data, time.before))),
> > > +		/* STORE_STATE timer */
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> > > +			  (40ull << 56) | (params->time_reg << 40) | (0ll << 32)),
> > >  
> > >  		/* MOV48 rX:rX+1, cs.start */
> > > -		(1ull << 56) | (addr_reg << 48) | job->call_info.start,
> > > -
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > > +			  (1ull << 56) | (params->addr_reg << 48) | params->cs_start),
> > >  		/* MOV32 rX+2, cs.size */
> > > -		(2ull << 56) | (val_reg << 48) | job->call_info.size,
> > > -
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > > +			  (2ull << 56) | (params->val_reg << 48) | params->cs_size),
> > >  		/* WAIT(0) => waits for FLUSH_CACHE2 instruction */
> > > -		(3ull << 56) | (1 << 16),
> > > -
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED, (3ull << 56) | (1 << 16)),
> > >  		/* CALL rX:rX+1, rX+2 */
> > > -		(32ull << 56) | (addr_reg << 40) | (val_reg << 32),
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > > +			  (32ull << 56) | (params->addr_reg << 40) | (params->val_reg << 32)),
> > > +
> > > +		/* MOV48 rX:rX+1, cycles_offset */
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
> > > +			  (1ull << 56) | (params->cycle_reg << 48) |
> > > +			  (params->times_addr +
> > > +			   offsetof(struct panthor_job_profiling_data, cycles.after))),
> > > +		/* STORE_STATE cycles */
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
> > > +			  (40ull << 56) | (params->cycle_reg << 40) | (1ll << 32)),
> > > +
> > > +		/* MOV48 rX:rX+1, time_offset */
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> > > +			  (1ull << 56) | (params->time_reg << 48) |
> > > +			  (params->times_addr +
> > > +			   offsetof(struct panthor_job_profiling_data, time.after))),
> > > +		/* STORE_STATE timer */
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> > > +			  (40ull << 56) | (params->time_reg << 40) | (0ll << 32)),
> > >  
> > >  		/* MOV48 rX:rX+1, sync_addr */
> > > -		(1ull << 56) | (addr_reg << 48) | sync_addr,
> > > -
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > > +			  (1ull << 56) | (params->addr_reg << 48) | params->sync_addr),
> > >  		/* MOV48 rX+2, #1 */
> > > -		(1ull << 56) | (val_reg << 48) | 1,
> > > -
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > > +			  (1ull << 56) | (params->val_reg << 48) | 1),
> > >  		/* WAIT(all) */
> > > -		(3ull << 56) | (waitall_mask << 16),
> > > -
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > > +			  (3ull << 56) | (params->waitall_mask << 16)),
> > >  		/* SYNC_ADD64.system_scope.propage_err.nowait rX:rX+1, rX+2*/
> > > -		(51ull << 56) | (0ull << 48) | (addr_reg << 40) | (val_reg << 32) | (0 << 16) | 1,
> > > -
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
> > > +			  (51ull << 56) | (0ull << 48) | (params->addr_reg << 40) |
> > > +			  (params->val_reg << 32) | (0 << 16) | 1),
> > >  		/* ERROR_BARRIER, so we can recover from faults at job
> > >  		 * boundaries.
> > >  		 */
> > > -		(47ull << 56),
> > > +		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED, (47ull << 56)),
> > > +	};
> > > +	u32 pad;
> > > +
> > > +	/* NEED to be cacheline aligned to please the prefetcher. */
> > > +	static_assert(sizeof(instrs->buffer) % 64 == 0,
> > > +		      "panthor_job_ringbuf_instrs::buffer is not aligned on a cacheline");
> > > +
> > > +	/* Make sure we have enough storage to store the whole sequence. */
> > > +	static_assert(ALIGN(ARRAY_SIZE(instr_seq), NUM_INSTRS_PER_CACHE_LINE) <=
> > > +		      ARRAY_SIZE(instrs->buffer),
> > > +		      "instr_seq vs panthor_job_ringbuf_instrs::buffer size mismatch");  
> > 
> > We probably want to catch situations where instrs->buffer has gone
> > bigger than needed (say we found a way to drop instructions), so I
> > would turn the '<=' condition into an '=='.  
> 
> I did this but it's triggering the static assert, because the instr_seq array has 19 elements,
> which when aligned to NUM_INSTRS_PER_CACHE_LINE (8 I think) renders 24, still less than the
> 32 slots in instrs->buffer. Having a slightly oversized instrs.buffer array isn't a problem
> though because instrs.count is being used when copying them into the ringbuffer, so I think
> leaving this assert as an <= should be alright. 

The whole point is to have a buffer that's the right size, rather than
bigger than needed. So I'd suggest changing the MAX_INSTRS definition
to make it 24 instead.

Patch

diff --git a/drivers/gpu/drm/panthor/panthor_device.h b/drivers/gpu/drm/panthor/panthor_device.h
index e388c0472ba7..a48e30d0af30 100644
--- a/drivers/gpu/drm/panthor/panthor_device.h
+++ b/drivers/gpu/drm/panthor/panthor_device.h
@@ -66,6 +66,25 @@  struct panthor_irq {
 	atomic_t suspended;
 };
 
+/**
+ * enum panthor_device_profiling_mode - Profiling state
+ */
+enum panthor_device_profiling_flags {
+	/** @PANTHOR_DEVICE_PROFILING_DISABLED: Profiling is disabled. */
+	PANTHOR_DEVICE_PROFILING_DISABLED = 0,
+
+	/** @PANTHOR_DEVICE_PROFILING_CYCLES: Sampling job cycles. */
+	PANTHOR_DEVICE_PROFILING_CYCLES = BIT(0),
+
+	/** @PANTHOR_DEVICE_PROFILING_TIMESTAMP: Sampling job timestamp. */
+	PANTHOR_DEVICE_PROFILING_TIMESTAMP = BIT(1),
+
+	/** @PANTHOR_DEVICE_PROFILING_ALL: Sampling everything. */
+	PANTHOR_DEVICE_PROFILING_ALL =
+	PANTHOR_DEVICE_PROFILING_CYCLES |
+	PANTHOR_DEVICE_PROFILING_TIMESTAMP,
+};
+
 /**
  * struct panthor_device - Panthor device
  */
@@ -162,6 +181,9 @@  struct panthor_device {
 		 */
 		struct page *dummy_latest_flush;
 	} pm;
+
+	/** @profile_mask: User-set profiling flags for job accounting. */
+	u32 profile_mask;
 };
 
 /**
diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c
index c426a392b081..b087648bf59a 100644
--- a/drivers/gpu/drm/panthor/panthor_sched.c
+++ b/drivers/gpu/drm/panthor/panthor_sched.c
@@ -93,6 +93,9 @@ 
 #define MIN_CSGS				3
 #define MAX_CSG_PRIO				0xf
 
+#define NUM_INSTRS_PER_CACHE_LINE		(64 / sizeof(u64))
+#define MAX_INSTRS_PER_JOB			32
+
 struct panthor_group;
 
 /**
@@ -476,6 +479,18 @@  struct panthor_queue {
 		 */
 		struct list_head in_flight_jobs;
 	} fence_ctx;
+
+	/** @profiling_info: Job profiling data slots and access information. */
+	struct {
+		/** @slots: Kernel BO holding the slots. */
+		struct panthor_kernel_bo *slots;
+
+		/** @slot_count: Number of jobs ringbuffer can hold at once. */
+		u32 slot_count;
+
+		/** @profiling_seqno: Index of the next available profiling information slot. */
+		u32 profiling_seqno;
+	} profiling_info;
 };
 
 /**
@@ -661,6 +676,18 @@  struct panthor_group {
 	struct list_head wait_node;
 };
 
+struct panthor_job_profiling_data {
+	struct {
+		u64 before;
+		u64 after;
+	} cycles;
+
+	struct {
+		u64 before;
+		u64 after;
+	} time;
+};
+
 /**
  * group_queue_work() - Queue a group work
  * @group: Group to queue the work for.
@@ -774,6 +801,12 @@  struct panthor_job {
 
 	/** @done_fence: Fence signaled when the job is finished or cancelled. */
 	struct dma_fence *done_fence;
+
+	/** @profile_mask: Current device job profiling enablement bitmask. */
+	u32 profile_mask;
+
+	/** @profile_slot: Job profiling information index in the profiling slots BO. */
+	u32 profiling_slot;
 };
 
 static void
@@ -838,6 +871,7 @@  static void group_free_queue(struct panthor_group *group, struct panthor_queue *
 
 	panthor_kernel_bo_destroy(queue->ringbuf);
 	panthor_kernel_bo_destroy(queue->iface.mem);
+	panthor_kernel_bo_destroy(queue->profiling_info.slots);
 
 	/* Release the last_fence we were holding, if any. */
 	dma_fence_put(queue->fence_ctx.last_fence);
@@ -1982,8 +2016,6 @@  tick_ctx_init(struct panthor_scheduler *sched,
 	}
 }
 
-#define NUM_INSTRS_PER_SLOT		16
-
 static void
 group_term_post_processing(struct panthor_group *group)
 {
@@ -2815,65 +2847,211 @@  static void group_sync_upd_work(struct work_struct *work)
 	group_put(group);
 }
 
-static struct dma_fence *
-queue_run_job(struct drm_sched_job *sched_job)
+struct panthor_job_ringbuf_instrs {
+	u64 buffer[MAX_INSTRS_PER_JOB];
+	u32 count;
+};
+
+struct panthor_job_instr {
+	u32 profile_mask;
+	u64 instr;
+};
+
+#define JOB_INSTR(__prof, __instr) \
+	{ \
+		.profile_mask = __prof, \
+		.instr = __instr, \
+	}
+
+static void
+copy_instrs_to_ringbuf(struct panthor_queue *queue,
+		       struct panthor_job *job,
+		       struct panthor_job_ringbuf_instrs *instrs)
+{
+	ssize_t ringbuf_size = panthor_kernel_bo_size(queue->ringbuf);
+	u32 start = job->ringbuf.start & (ringbuf_size - 1);
+	ssize_t size, written;
+
+	/*
+	 * We need to write a whole slot, including any trailing zeroes
+	 * that may come at the end of it. Also, because instrs.buffer had
+	 * been zero-initialised, there's no need to pad it with 0's
+	 */
+	instrs->count = ALIGN(instrs->count, NUM_INSTRS_PER_CACHE_LINE);
+	size = instrs->count * sizeof(u64);
+	written = min(ringbuf_size - start, size);
+
+	memcpy(queue->ringbuf->kmap + start, instrs->buffer, written);
+
+	if (written < size)
+		memcpy(queue->ringbuf->kmap,
+		       &instrs->buffer[(ringbuf_size - start)/sizeof(u64)],
+		       size - written);
+}
+
+struct panthor_job_cs_params {
+	u32 profile_mask;
+	u64 addr_reg; u64 val_reg;
+	u64 cycle_reg; u64 time_reg;
+	u64 sync_addr; u64 times_addr;
+	u64 cs_start; u64 cs_size;
+	u32 last_flush; u32 waitall_mask;
+};
+
+static void
+get_job_cs_params(struct panthor_job *job, struct panthor_job_cs_params *params)
 {
-	struct panthor_job *job = container_of(sched_job, struct panthor_job, base);
 	struct panthor_group *group = job->group;
 	struct panthor_queue *queue = group->queues[job->queue_idx];
 	struct panthor_device *ptdev = group->ptdev;
 	struct panthor_scheduler *sched = ptdev->scheduler;
-	u32 ringbuf_size = panthor_kernel_bo_size(queue->ringbuf);
-	u32 ringbuf_insert = queue->iface.input->insert & (ringbuf_size - 1);
-	u64 addr_reg = ptdev->csif_info.cs_reg_count -
-		       ptdev->csif_info.unpreserved_cs_reg_count;
-	u64 val_reg = addr_reg + 2;
-	u64 sync_addr = panthor_kernel_bo_gpuva(group->syncobjs) +
-			job->queue_idx * sizeof(struct panthor_syncobj_64b);
-	u32 waitall_mask = GENMASK(sched->sb_slot_count - 1, 0);
-	struct dma_fence *done_fence;
-	int ret;
 
-	u64 call_instrs[NUM_INSTRS_PER_SLOT] = {
+	params->addr_reg = ptdev->csif_info.cs_reg_count -
+			   ptdev->csif_info.unpreserved_cs_reg_count;
+	params->val_reg = params->addr_reg + 2;
+	params->cycle_reg = params->addr_reg;
+	params->time_reg = params->val_reg;
+
+	params->sync_addr = panthor_kernel_bo_gpuva(group->syncobjs) +
+			    job->queue_idx * sizeof(struct panthor_syncobj_64b);
+	params->times_addr = panthor_kernel_bo_gpuva(queue->profiling_info.slots) +
+			     (job->profiling_slot * sizeof(struct panthor_job_profiling_data));
+	params->waitall_mask = GENMASK(sched->sb_slot_count - 1, 0);
+
+	params->cs_start = job->call_info.start;
+	params->cs_size = job->call_info.size;
+	params->last_flush = job->call_info.latest_flush;
+
+	params->profile_mask = job->profile_mask;
+}
+
+static void
+prepare_job_instrs(const struct panthor_job_cs_params *params,
+		   struct panthor_job_ringbuf_instrs *instrs)
+{
+	const struct panthor_job_instr instr_seq[] = {
 		/* MOV32 rX+2, cs.latest_flush */
-		(2ull << 56) | (val_reg << 48) | job->call_info.latest_flush,
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
+			  (2ull << 56) | (params->val_reg << 48) | params->last_flush),
 
 		/* FLUSH_CACHE2.clean_inv_all.no_wait.signal(0) rX+2 */
-		(36ull << 56) | (0ull << 48) | (val_reg << 40) | (0 << 16) | 0x233,
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
+			  (36ull << 56) | (0ull << 48) | (params->val_reg << 40) | (0 << 16) | 0x233),
+
+		/* MOV48 rX:rX+1, cycles_offset */
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
+			  (1ull << 56) | (params->cycle_reg << 48) |
+			  (params->times_addr +
+			   offsetof(struct panthor_job_profiling_data, cycles.before))),
+		/* STORE_STATE cycles */
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
+			  (40ull << 56) | (params->cycle_reg << 40) | (1ll << 32)),
+		/* MOV48 rX:rX+1, time_offset */
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
+			  (1ull << 56) | (params->time_reg << 48) |
+			  (params->times_addr +
+			   offsetof(struct panthor_job_profiling_data, time.before))),
+		/* STORE_STATE timer */
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
+			  (40ull << 56) | (params->time_reg << 40) | (0ll << 32)),
 
 		/* MOV48 rX:rX+1, cs.start */
-		(1ull << 56) | (addr_reg << 48) | job->call_info.start,
-
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
+			  (1ull << 56) | (params->addr_reg << 48) | params->cs_start),
 		/* MOV32 rX+2, cs.size */
-		(2ull << 56) | (val_reg << 48) | job->call_info.size,
-
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
+			  (2ull << 56) | (params->val_reg << 48) | params->cs_size),
 		/* WAIT(0) => waits for FLUSH_CACHE2 instruction */
-		(3ull << 56) | (1 << 16),
-
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED, (3ull << 56) | (1 << 16)),
 		/* CALL rX:rX+1, rX+2 */
-		(32ull << 56) | (addr_reg << 40) | (val_reg << 32),
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
+			  (32ull << 56) | (params->addr_reg << 40) | (params->val_reg << 32)),
+
+		/* MOV48 rX:rX+1, cycles_offset */
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
+			  (1ull << 56) | (params->cycle_reg << 48) |
+			  (params->times_addr +
+			   offsetof(struct panthor_job_profiling_data, cycles.after))),
+		/* STORE_STATE cycles */
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES,
+			  (40ull << 56) | (params->cycle_reg << 40) | (1ll << 32)),
+
+		/* MOV48 rX:rX+1, time_offset */
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
+			  (1ull << 56) | (params->time_reg << 48) |
+			  (params->times_addr +
+			   offsetof(struct panthor_job_profiling_data, time.after))),
+		/* STORE_STATE timer */
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP,
+			  (40ull << 56) | (params->time_reg << 40) | (0ll << 32)),
 
 		/* MOV48 rX:rX+1, sync_addr */
-		(1ull << 56) | (addr_reg << 48) | sync_addr,
-
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
+			  (1ull << 56) | (params->addr_reg << 48) | params->sync_addr),
 		/* MOV48 rX+2, #1 */
-		(1ull << 56) | (val_reg << 48) | 1,
-
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
+			  (1ull << 56) | (params->val_reg << 48) | 1),
 		/* WAIT(all) */
-		(3ull << 56) | (waitall_mask << 16),
-
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
+			  (3ull << 56) | (params->waitall_mask << 16)),
 		/* SYNC_ADD64.system_scope.propage_err.nowait rX:rX+1, rX+2*/
-		(51ull << 56) | (0ull << 48) | (addr_reg << 40) | (val_reg << 32) | (0 << 16) | 1,
-
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED,
+			  (51ull << 56) | (0ull << 48) | (params->addr_reg << 40) |
+			  (params->val_reg << 32) | (0 << 16) | 1),
 		/* ERROR_BARRIER, so we can recover from faults at job
 		 * boundaries.
 		 */
-		(47ull << 56),
+		JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED, (47ull << 56)),
+	};
+	u32 pad;
+
+	/* NEED to be cacheline aligned to please the prefetcher. */
+	static_assert(sizeof(instrs->buffer) % 64 == 0,
+		      "panthor_job_ringbuf_instrs::buffer is not aligned on a cacheline");
+
+	/* Make sure we have enough storage to store the whole sequence. */
+	static_assert(ALIGN(ARRAY_SIZE(instr_seq), NUM_INSTRS_PER_CACHE_LINE) <=
+		      ARRAY_SIZE(instrs->buffer),
+		      "instr_seq vs panthor_job_ringbuf_instrs::buffer size mismatch");
+
+	for (u32 i = 0; i < ARRAY_SIZE(instr_seq); i++) {
+		/* If the profile mask of this instruction is not enabled, skip it. */
+		if (instr_seq[i].profile_mask &&
+		    !(instr_seq[i].profile_mask & params->profile_mask))
+			continue;
+
+		instrs->buffer[instrs->count++] = instr_seq[i].instr;
+	}
+
+	pad = ALIGN(instrs->count, NUM_INSTRS_PER_CACHE_LINE);
+	memset(&instrs->buffer[instrs->count], 0,
+	       (pad - instrs->count) * sizeof(instrs->buffer[0]));
+	instrs->count = pad;
+}
+
+static u32 calc_job_credits(u32 profile_mask)
+{
+	struct panthor_job_ringbuf_instrs instrs;
+	struct panthor_job_cs_params params = {
+		.profile_mask = profile_mask,
 	};
 
-	/* Need to be cacheline aligned to please the prefetcher. */
-	static_assert(sizeof(call_instrs) % 64 == 0,
-		      "call_instrs is not aligned on a cacheline");
+	prepare_job_instrs(&params, &instrs);
+	return instrs.count;
+}
+
+static struct dma_fence *
+queue_run_job(struct drm_sched_job *sched_job)
+{
+	struct panthor_job *job = container_of(sched_job, struct panthor_job, base);
+	struct panthor_group *group = job->group;
+	struct panthor_queue *queue = group->queues[job->queue_idx];
+	struct panthor_device *ptdev = group->ptdev;
+	struct panthor_scheduler *sched = ptdev->scheduler;
+	struct panthor_job_ringbuf_instrs instrs;
+	struct panthor_job_cs_params cs_params;
+	struct dma_fence *done_fence;
+	int ret;
 
 	/* Stream size is zero, nothing to do except making sure all previously
 	 * submitted jobs are done before we signal the
@@ -2900,17 +3078,23 @@  queue_run_job(struct drm_sched_job *sched_job)
 		       queue->fence_ctx.id,
 		       atomic64_inc_return(&queue->fence_ctx.seqno));
 
-	memcpy(queue->ringbuf->kmap + ringbuf_insert,
-	       call_instrs, sizeof(call_instrs));
+	job->profiling_slot = queue->profiling_info.profiling_seqno++;
+	if (queue->profiling_info.profiling_seqno == queue->profiling_info.slot_count)
+		queue->profiling_info.profiling_seqno = 0;
+
+	job->ringbuf.start = queue->iface.input->insert;
+
+	get_job_cs_params(job, &cs_params);
+	prepare_job_instrs(&cs_params, &instrs);
+	copy_instrs_to_ringbuf(queue, job, &instrs);
+
+	job->ringbuf.end = job->ringbuf.start + (instrs.count * sizeof(u64));
 
 	panthor_job_get(&job->base);
 	spin_lock(&queue->fence_ctx.lock);
 	list_add_tail(&job->node, &queue->fence_ctx.in_flight_jobs);
 	spin_unlock(&queue->fence_ctx.lock);
 
-	job->ringbuf.start = queue->iface.input->insert;
-	job->ringbuf.end = job->ringbuf.start + sizeof(call_instrs);
-
 	/* Make sure the ring buffer is updated before the INSERT
 	 * register.
 	 */
@@ -3003,6 +3187,24 @@  static const struct drm_sched_backend_ops panthor_queue_sched_ops = {
 	.free_job = queue_free_job,
 };
 
+static u32 calc_profiling_ringbuf_num_slots(struct panthor_device *ptdev,
+				       u32 cs_ringbuf_size)
+{
+	u32 min_profiled_job_instrs = U32_MAX;
+	u32 last_flag = fls(PANTHOR_DEVICE_PROFILING_ALL);
+
+	for (u32 i = 0; i < last_flag; i++) {
+		if (BIT(i) & PANTHOR_DEVICE_PROFILING_ALL)
+			min_profiled_job_instrs =
+				min(min_profiled_job_instrs, calc_job_credits(BIT(i)));
+	}
+
+	drm_WARN_ON(&ptdev->base,
+		    !IS_ALIGNED(min_profiled_job_instrs, NUM_INSTRS_PER_CACHE_LINE));
+
+	return DIV_ROUND_UP(cs_ringbuf_size, min_profiled_job_instrs * sizeof(u64));
+}
+
 static struct panthor_queue *
 group_create_queue(struct panthor_group *group,
 		   const struct drm_panthor_queue_create *args)
@@ -3056,9 +3258,38 @@  group_create_queue(struct panthor_group *group,
 		goto err_free_queue;
 	}
 
+	queue->profiling_info.slot_count =
+		calc_profiling_ringbuf_num_slots(group->ptdev, args->ringbuf_size);
+
+	queue->profiling_info.slots =
+		panthor_kernel_bo_create(group->ptdev, group->vm,
+					 queue->profiling_info.slot_count *
+					 sizeof(struct panthor_job_profiling_data),
+					 DRM_PANTHOR_BO_NO_MMAP,
+					 DRM_PANTHOR_VM_BIND_OP_MAP_NOEXEC |
+					 DRM_PANTHOR_VM_BIND_OP_MAP_UNCACHED,
+					 PANTHOR_VM_KERNEL_AUTO_VA);
+
+	if (IS_ERR(queue->profiling_info.slots)) {
+		ret = PTR_ERR(queue->profiling_info.slots);
+		goto err_free_queue;
+	}
+
+	ret = panthor_kernel_bo_vmap(queue->profiling_info.slots);
+	if (ret)
+		goto err_free_queue;
+
+	memset(queue->profiling_info.slots->kmap, 0,
+	       queue->profiling_info.slot_count * sizeof(struct panthor_job_profiling_data));
+
+	/*
+	 * Credit limit argument tells us the total number of instructions
+	 * across all CS slots in the ringbuffer, with some jobs requiring
+	 * twice as many as others, depending on their profiling status.
+	 */
 	ret = drm_sched_init(&queue->scheduler, &panthor_queue_sched_ops,
 			     group->ptdev->scheduler->wq, 1,
-			     args->ringbuf_size / (NUM_INSTRS_PER_SLOT * sizeof(u64)),
+			     args->ringbuf_size / sizeof(u64),
 			     0, msecs_to_jiffies(JOB_TIMEOUT_MS),
 			     group->ptdev->reset.wq,
 			     NULL, "panthor-queue", group->ptdev->base.dev);
@@ -3354,6 +3585,7 @@  panthor_job_create(struct panthor_file *pfile,
 {
 	struct panthor_group_pool *gpool = pfile->groups;
 	struct panthor_job *job;
+	u32 credits;
 	int ret;
 
 	if (qsubmit->pad)
@@ -3407,9 +3639,16 @@  panthor_job_create(struct panthor_file *pfile,
 		}
 	}
 
+	job->profile_mask = pfile->ptdev->profile_mask;
+	credits = calc_job_credits(job->profile_mask);
+	if (credits == 0) {
+		ret = -EINVAL;
+		goto err_put_job;
+	}
+
 	ret = drm_sched_job_init(&job->base,
 				 &job->group->queues[job->queue_idx]->entity,
-				 1, job->group);
+				 credits, job->group);
 	if (ret)
 		goto err_put_job;