diff mbox series

[v5,06/22] drivers/perf: riscv: Implement SBI PMU snapshot function

Message ID 20240403080452.1007601-7-atishp@rivosinc.com (mailing list archive)
State New
Headers show
Series RISC-V SBI v2.0 PMU improvements and Perf sampling in KVM guest | expand

Commit Message

Atish Patra April 3, 2024, 8:04 a.m. UTC 
SBI v2.0 SBI introduced PMU snapshot feature which adds the following
features.

1. Read counter values directly from the shared memory instead of
csr read.
2. Start multiple counters with initial values with one SBI call.

These functionalities optimizes the number of traps to the higher
privilege mode. If the kernel is in VS mode while the hypervisor
deploy trap & emulate method, this would minimize all the hpmcounter
CSR read traps. If the kernel is running in S-mode, the benefits
reduced to CSR latency vs DRAM/cache latency as there is no trap
involved while accessing the hpmcounter CSRs.

In both modes, it does saves the number of ecalls while starting
multiple counter together with an initial values. This is a likely
scenario if multiple counters overflow at the same time.

Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
---
 drivers/perf/riscv_pmu.c       |   1 +
 drivers/perf/riscv_pmu_sbi.c   | 216 +++++++++++++++++++++++++++++++--
 include/linux/perf/riscv_pmu.h |   6 +
 3 files changed, 211 insertions(+), 12 deletions(-)

Comments

Andrew Jones April 4, 2024, 11:52 a.m. UTC | #1 
On Wed, Apr 03, 2024 at 01:04:35AM -0700, Atish Patra wrote:
> SBI v2.0 SBI introduced PMU snapshot feature which adds the following
> features.
> 
> 1. Read counter values directly from the shared memory instead of
> csr read.
> 2. Start multiple counters with initial values with one SBI call.
> 
> These functionalities optimizes the number of traps to the higher
> privilege mode. If the kernel is in VS mode while the hypervisor
> deploy trap & emulate method, this would minimize all the hpmcounter
> CSR read traps. If the kernel is running in S-mode, the benefits
> reduced to CSR latency vs DRAM/cache latency as there is no trap
> involved while accessing the hpmcounter CSRs.
> 
> In both modes, it does saves the number of ecalls while starting
> multiple counter together with an initial values. This is a likely
> scenario if multiple counters overflow at the same time.
> 
> Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
> Reviewed-by: Anup Patel <anup@brainfault.org>
> Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
> Signed-off-by: Atish Patra <atishp@rivosinc.com>
> ---
>  drivers/perf/riscv_pmu.c       |   1 +
>  drivers/perf/riscv_pmu_sbi.c   | 216 +++++++++++++++++++++++++++++++--
>  include/linux/perf/riscv_pmu.h |   6 +
>  3 files changed, 211 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/perf/riscv_pmu.c b/drivers/perf/riscv_pmu.c
> index c78a6fd6c57f..3a941b2c3888 100644
> --- a/drivers/perf/riscv_pmu.c
> +++ b/drivers/perf/riscv_pmu.c
> @@ -404,6 +404,7 @@ struct riscv_pmu *riscv_pmu_alloc(void)
>  		cpuc->n_events = 0;
>  		for (i = 0; i < RISCV_MAX_COUNTERS; i++)
>  			cpuc->events[i] = NULL;
> +		cpuc->snapshot_addr = NULL;
>  	}
>  	pmu->pmu = (struct pmu) {
>  		.event_init	= riscv_pmu_event_init,
> diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c
> index a83ae82301e3..8c3475d55433 100644
> --- a/drivers/perf/riscv_pmu_sbi.c
> +++ b/drivers/perf/riscv_pmu_sbi.c
> @@ -58,6 +58,9 @@ PMU_FORMAT_ATTR(event, "config:0-47");
>  PMU_FORMAT_ATTR(firmware, "config:63");
>  
>  static bool sbi_v2_available;
> +static DEFINE_STATIC_KEY_FALSE(sbi_pmu_snapshot_available);
> +#define sbi_pmu_snapshot_available() \
> +	static_branch_unlikely(&sbi_pmu_snapshot_available)
>  
>  static struct attribute *riscv_arch_formats_attr[] = {
>  	&format_attr_event.attr,
> @@ -508,14 +511,108 @@ static int pmu_sbi_event_map(struct perf_event *event, u64 *econfig)
>  	return ret;
>  }
>  
> +static void pmu_sbi_snapshot_free(struct riscv_pmu *pmu)
> +{
> +	int cpu;
> +
> +	for_each_possible_cpu(cpu) {
> +		struct cpu_hw_events *cpu_hw_evt = per_cpu_ptr(pmu->hw_events, cpu);
> +
> +		if (!cpu_hw_evt->snapshot_addr)
> +			continue;
> +
> +		free_page((unsigned long)cpu_hw_evt->snapshot_addr);
> +		cpu_hw_evt->snapshot_addr = NULL;
> +		cpu_hw_evt->snapshot_addr_phys = 0;
> +	}
> +}
> +
> +static int pmu_sbi_snapshot_alloc(struct riscv_pmu *pmu)
> +{
> +	int cpu;
> +	struct page *snapshot_page;
> +
> +	for_each_possible_cpu(cpu) {
> +		struct cpu_hw_events *cpu_hw_evt = per_cpu_ptr(pmu->hw_events, cpu);
> +
> +		if (cpu_hw_evt->snapshot_addr)
> +			continue;
> +
> +		snapshot_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
> +		if (!snapshot_page) {
> +			pmu_sbi_snapshot_free(pmu);
> +			return -ENOMEM;
> +		}
> +		cpu_hw_evt->snapshot_addr = page_to_virt(snapshot_page);
> +		cpu_hw_evt->snapshot_addr_phys = page_to_phys(snapshot_page);
> +	}
> +
> +	return 0;
> +}
> +
> +static int pmu_sbi_snapshot_disable(void)
> +{
> +	struct sbiret ret;
> +
> +	ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_SNAPSHOT_SET_SHMEM, -1,
> +			-1, 0, 0, 0, 0);
> +	if (ret.error) {
> +		pr_warn("failed to disable snapshot shared memory\n");
> +		return sbi_err_map_linux_errno(ret.error);
> +	}

Also need to set snapshot_set_done to false, but I'm not yet convinced
that we need snapshot_set_done, especially if we don't allow
snapshot_addr_phys to be zero, since zero can then mean set-not-done,
but ~0UL is probably a better invalid physical address choice than zero.

> +
> +	return 0;
> +}
> +
> +static int pmu_sbi_snapshot_setup(struct riscv_pmu *pmu, int cpu)
> +{
> +	struct cpu_hw_events *cpu_hw_evt;
> +	struct sbiret ret = {0};
> +
> +	cpu_hw_evt = per_cpu_ptr(pmu->hw_events, cpu);
> +	if (!cpu_hw_evt->snapshot_addr_phys)
> +		return -EINVAL;
> +
> +	if (cpu_hw_evt->snapshot_set_done)
> +		return 0;
> +
> +	if (IS_ENABLED(CONFIG_32BIT))
> +		ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_SNAPSHOT_SET_SHMEM,
> +				cpu_hw_evt->snapshot_addr_phys,
> +				(u64)(cpu_hw_evt->snapshot_addr_phys) >> 32, 0, 0, 0, 0);
> +	else
> +		ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_SNAPSHOT_SET_SHMEM,
> +				cpu_hw_evt->snapshot_addr_phys, 0, 0, 0, 0, 0);
> +
> +	/* Free up the snapshot area memory and fall back to SBI PMU calls without snapshot */
> +	if (ret.error) {
> +		if (ret.error != SBI_ERR_NOT_SUPPORTED)
> +			pr_warn("pmu snapshot setup failed with error %ld\n", ret.error);
> +		return sbi_err_map_linux_errno(ret.error);
> +	}
> +
> +	cpu_hw_evt->snapshot_set_done = true;
> +
> +	return 0;
> +}
> +
>  static u64 pmu_sbi_ctr_read(struct perf_event *event)
>  {
>  	struct hw_perf_event *hwc = &event->hw;
>  	int idx = hwc->idx;
>  	struct sbiret ret;
>  	u64 val = 0;
> +	struct riscv_pmu *pmu = to_riscv_pmu(event->pmu);
> +	struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
> +	struct riscv_pmu_snapshot_data *sdata = cpu_hw_evt->snapshot_addr;
>  	union sbi_pmu_ctr_info info = pmu_ctr_list[idx];
>  
> +	/* Read the value from the shared memory directly */
> +	if (sbi_pmu_snapshot_available()) {
> +		val = sdata->ctr_values[idx];
> +		return val;
> +	}
> +
>  	if (pmu_sbi_is_fw_event(event)) {
>  		ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_FW_READ,
>  				hwc->idx, 0, 0, 0, 0, 0);
> @@ -565,6 +662,7 @@ static void pmu_sbi_ctr_start(struct perf_event *event, u64 ival)
>  	struct hw_perf_event *hwc = &event->hw;
>  	unsigned long flag = SBI_PMU_START_FLAG_SET_INIT_VALUE;
>  
> +	/* There is no benefit setting SNAPSHOT FLAG for a single counter */
>  #if defined(CONFIG_32BIT)
>  	ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, hwc->idx,
>  			1, flag, ival, ival >> 32, 0);
> @@ -585,16 +683,36 @@ static void pmu_sbi_ctr_stop(struct perf_event *event, unsigned long flag)
>  {
>  	struct sbiret ret;
>  	struct hw_perf_event *hwc = &event->hw;
> +	struct riscv_pmu *pmu = to_riscv_pmu(event->pmu);
> +	struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
> +	struct riscv_pmu_snapshot_data *sdata = cpu_hw_evt->snapshot_addr;
>  
>  	if ((hwc->flags & PERF_EVENT_FLAG_USER_ACCESS) &&
>  	    (hwc->flags & PERF_EVENT_FLAG_USER_READ_CNT))
>  		pmu_sbi_reset_scounteren((void *)event);
>  
> +	if (sbi_pmu_snapshot_available())
> +		flag |= SBI_PMU_STOP_FLAG_TAKE_SNAPSHOT;
> +
>  	ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_STOP, hwc->idx, 1, flag, 0, 0, 0);
> -	if (ret.error && (ret.error != SBI_ERR_ALREADY_STOPPED) &&
> -		flag != SBI_PMU_STOP_FLAG_RESET)
> +	if (!ret.error && sbi_pmu_snapshot_available()) {
> +		/*
> +		 * The counter snapshot is based on the index base specified by hwc->idx.
> +		 * The actual counter value is updated in shared memory at index 0 when counter
> +		 * mask is 0x01. To ensure accurate counter values, it's necessary to transfer
> +		 * the counter value to shared memory. However, if hwc->idx is zero, the counter
> +		 * value is already correctly updated in shared memory, requiring no further
> +		 * adjustment.
> +		 */
> +		if (hwc->idx > 0) {
> +			sdata->ctr_values[hwc->idx] = sdata->ctr_values[0];
> +			sdata->ctr_values[0] = 0;
> +		}
> +	} else if (ret.error && (ret.error != SBI_ERR_ALREADY_STOPPED) &&
> +		flag != SBI_PMU_STOP_FLAG_RESET) {
>  		pr_err("Stopping counter idx %d failed with error %d\n",
>  			hwc->idx, sbi_err_map_linux_errno(ret.error));
> +	}
>  }
>  
>  static int pmu_sbi_find_num_ctrs(void)
> @@ -652,10 +770,14 @@ static inline void pmu_sbi_stop_all(struct riscv_pmu *pmu)
>  static inline void pmu_sbi_stop_hw_ctrs(struct riscv_pmu *pmu)
>  {
>  	struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
> +	unsigned long flag = 0;
> +
> +	if (sbi_pmu_snapshot_available())
> +		flag = SBI_PMU_STOP_FLAG_TAKE_SNAPSHOT;
>  
>  	/* No need to check the error here as we can't do anything about the error */
>  	sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_STOP, 0,
> -		  cpu_hw_evt->used_hw_ctrs[0], 0, 0, 0, 0);
> +		  cpu_hw_evt->used_hw_ctrs[0], flag, 0, 0, 0);
>  }
>  
>  /*
> @@ -664,11 +786,10 @@ static inline void pmu_sbi_stop_hw_ctrs(struct riscv_pmu *pmu)
>   * while the overflowed counters need to be started with updated initialization
>   * value.
>   */
> -static inline void pmu_sbi_start_overflow_mask(struct riscv_pmu *pmu,
> -					       unsigned long ctr_ovf_mask)
> +static noinline void pmu_sbi_start_ovf_ctrs_sbi(struct cpu_hw_events *cpu_hw_evt,
> +						unsigned long ctr_ovf_mask)
>  {
>  	int idx = 0;
> -	struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
>  	struct perf_event *event;
>  	unsigned long flag = SBI_PMU_START_FLAG_SET_INIT_VALUE;
>  	unsigned long ctr_start_mask = 0;
> @@ -703,6 +824,48 @@ static inline void pmu_sbi_start_overflow_mask(struct riscv_pmu *pmu,
>  	}
>  }
>  
> +static noinline void pmu_sbi_start_ovf_ctrs_snapshot(struct cpu_hw_events *cpu_hw_evt,
> +						     unsigned long ctr_ovf_mask)
> +{
> +	int idx = 0;
> +	struct perf_event *event;
> +	unsigned long flag = SBI_PMU_START_FLAG_INIT_SNAPSHOT;
> +	u64 max_period, init_val = 0;
> +	struct hw_perf_event *hwc;
> +	struct riscv_pmu_snapshot_data *sdata = cpu_hw_evt->snapshot_addr;
> +
> +	for_each_set_bit(idx, cpu_hw_evt->used_hw_ctrs, RISCV_MAX_COUNTERS) {
> +		if (ctr_ovf_mask & (BIT(idx))) {

Unnecessary () around BIT()

> +			event = cpu_hw_evt->events[idx];
> +			hwc = &event->hw;
> +			max_period = riscv_pmu_ctr_get_width_mask(event);
> +			init_val = local64_read(&hwc->prev_count) & max_period;
> +			sdata->ctr_values[idx] = init_val;
> +		}
> +		/*
> +		 * We do not need to update the non-overflow counters the previous
> +		 * value should have been there already.
> +		 */
> +	}
> +
> +	for (idx = 0; idx < BITS_TO_LONGS(RISCV_MAX_COUNTERS); idx++) {
> +		/* Start all the counters in a single shot */
> +		sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, idx * BITS_PER_LONG,
> +			  cpu_hw_evt->used_hw_ctrs[idx], flag, 0, 0, 0);
> +	}
> +}
> +
> +static void pmu_sbi_start_overflow_mask(struct riscv_pmu *pmu,
> +					unsigned long ctr_ovf_mask)
> +{
> +	struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
> +
> +	if (sbi_pmu_snapshot_available())
> +		pmu_sbi_start_ovf_ctrs_snapshot(cpu_hw_evt, ctr_ovf_mask);
> +	else
> +		pmu_sbi_start_ovf_ctrs_sbi(cpu_hw_evt, ctr_ovf_mask);
> +}
> +
>  static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev)
>  {
>  	struct perf_sample_data data;
> @@ -716,6 +879,7 @@ static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev)
>  	unsigned long overflowed_ctrs = 0;
>  	struct cpu_hw_events *cpu_hw_evt = dev;
>  	u64 start_clock = sched_clock();
> +	struct riscv_pmu_snapshot_data *sdata = cpu_hw_evt->snapshot_addr;
>  
>  	if (WARN_ON_ONCE(!cpu_hw_evt))
>  		return IRQ_NONE;
> @@ -737,8 +901,10 @@ static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev)
>  	pmu_sbi_stop_hw_ctrs(pmu);
>  
>  	/* Overflow status register should only be read after counter are stopped */
> -	ALT_SBI_PMU_OVERFLOW(overflow);
> -
> +	if (sbi_pmu_snapshot_available())
> +		overflow = sdata->ctr_overflow_mask;
> +	else
> +		ALT_SBI_PMU_OVERFLOW(overflow);
>  	/*
>  	 * Overflow interrupt pending bit should only be cleared after stopping
>  	 * all the counters to avoid any race condition.
> @@ -819,6 +985,9 @@ static int pmu_sbi_starting_cpu(unsigned int cpu, struct hlist_node *node)
>  		enable_percpu_irq(riscv_pmu_irq, IRQ_TYPE_NONE);
>  	}
>  
> +	if (sbi_pmu_snapshot_available())
> +		return pmu_sbi_snapshot_setup(pmu, cpu);
> +
>  	return 0;
>  }
>  
> @@ -831,6 +1000,9 @@ static int pmu_sbi_dying_cpu(unsigned int cpu, struct hlist_node *node)
>  	/* Disable all counters access for user mode now */
>  	csr_write(CSR_SCOUNTEREN, 0x0);
>  
> +	if (sbi_pmu_snapshot_available())
> +		return pmu_sbi_snapshot_disable();
> +
>  	return 0;
>  }
>  
> @@ -1106,10 +1278,6 @@ static int pmu_sbi_device_probe(struct platform_device *pdev)
>  	pmu->event_unmapped = pmu_sbi_event_unmapped;
>  	pmu->csr_index = pmu_sbi_csr_index;
>  
> -	ret = cpuhp_state_add_instance(CPUHP_AP_PERF_RISCV_STARTING, &pmu->node);
> -	if (ret)
> -		return ret;
> -
>  	ret = riscv_pm_pmu_register(pmu);
>  	if (ret)
>  		goto out_unregister;
> @@ -1118,8 +1286,32 @@ static int pmu_sbi_device_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto out_unregister;
>  
> +	/* SBI PMU Snapsphot is only available in SBI v2.0 */
> +	if (sbi_v2_available) {
> +		ret = pmu_sbi_snapshot_alloc(pmu);
> +		if (ret)
> +			goto out_unregister;
> +
> +		ret = pmu_sbi_snapshot_setup(pmu, smp_processor_id());
> +		if (!ret) {
> +			pr_info("SBI PMU snapshot detected\n");
> +			/*
> +			 * We enable it once here for the boot cpu. If snapshot shmem setup
> +			 * fails during cpu hotplug process, it will fail to start the cpu
> +			 * as we can not handle hetergenous PMUs with different snapshot
> +			 * capability.
> +			 */
> +			static_branch_enable(&sbi_pmu_snapshot_available);
> +		}
> +		/* Snapshot is an optional feature. Continue if not available */
> +	}
> +
>  	register_sysctl("kernel", sbi_pmu_sysctl_table);
>  
> +	ret = cpuhp_state_add_instance(CPUHP_AP_PERF_RISCV_STARTING, &pmu->node);
> +	if (ret)
> +		return ret;

This should be goto out_unregister, and in the case of sbi_v2_available we
also need a pmu_sbi_snapshot_free() and a pmu_sbi_snapshot_disable().

> +
>  	return 0;
>  
>  out_unregister:
> diff --git a/include/linux/perf/riscv_pmu.h b/include/linux/perf/riscv_pmu.h
> index 43282e22ebe1..c3fa90970042 100644
> --- a/include/linux/perf/riscv_pmu.h
> +++ b/include/linux/perf/riscv_pmu.h
> @@ -39,6 +39,12 @@ struct cpu_hw_events {
>  	DECLARE_BITMAP(used_hw_ctrs, RISCV_MAX_COUNTERS);
>  	/* currently enabled firmware counters */
>  	DECLARE_BITMAP(used_fw_ctrs, RISCV_MAX_COUNTERS);
> +	/* The virtual address of the shared memory where counter snapshot will be taken */
> +	void *snapshot_addr;
> +	/* The physical address of the shared memory where counter snapshot will be taken */
> +	phys_addr_t snapshot_addr_phys;
> +	/* Boolean flag to indicate setup is already done */
> +	bool snapshot_set_done;
>  };
>  
>  struct riscv_pmu {
> -- 
> 2.34.1
>

Thanks,
drew
Andrew Jones April 4, 2024, 12:01 p.m. UTC | #2 
On Wed, Apr 03, 2024 at 01:04:35AM -0700, Atish Patra wrote:
...
> +static int pmu_sbi_snapshot_disable(void)
> +{
> +	struct sbiret ret;
> +
> +	ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_SNAPSHOT_SET_SHMEM, -1,
> +			-1, 0, 0, 0, 0);

The "Rename the SBI_STA_SHMEM_DISABLE" patch should come before this
patch so SBI_SHMEM_DISABLE can be used instead of the -1's here.

Thanks,
drew
Atish Patra April 9, 2024, 12:21 a.m. UTC | #3 
On 4/4/24 05:01, Andrew Jones wrote:
> On Wed, Apr 03, 2024 at 01:04:35AM -0700, Atish Patra wrote:
> ...
>> +static int pmu_sbi_snapshot_disable(void)
>> +{
>> +	struct sbiret ret;
>> +
>> +	ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_SNAPSHOT_SET_SHMEM, -1,
>> +			-1, 0, 0, 0, 0);
> 
> The "Rename the SBI_STA_SHMEM_DISABLE" patch should come before this
> patch so SBI_SHMEM_DISABLE can be used instead of the -1's here.
> 

Sure. Done.

> Thanks,
> drew
Atish Patra April 10, 2024, 10:29 p.m. UTC | #4 
On 4/4/24 04:52, Andrew Jones wrote:
> On Wed, Apr 03, 2024 at 01:04:35AM -0700, Atish Patra wrote:
>> SBI v2.0 SBI introduced PMU snapshot feature which adds the following
>> features.
>>
>> 1. Read counter values directly from the shared memory instead of
>> csr read.
>> 2. Start multiple counters with initial values with one SBI call.
>>
>> These functionalities optimizes the number of traps to the higher
>> privilege mode. If the kernel is in VS mode while the hypervisor
>> deploy trap & emulate method, this would minimize all the hpmcounter
>> CSR read traps. If the kernel is running in S-mode, the benefits
>> reduced to CSR latency vs DRAM/cache latency as there is no trap
>> involved while accessing the hpmcounter CSRs.
>>
>> In both modes, it does saves the number of ecalls while starting
>> multiple counter together with an initial values. This is a likely
>> scenario if multiple counters overflow at the same time.
>>
>> Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
>> Reviewed-by: Anup Patel <anup@brainfault.org>
>> Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
>> Signed-off-by: Atish Patra <atishp@rivosinc.com>
>> ---
>>   drivers/perf/riscv_pmu.c       |   1 +
>>   drivers/perf/riscv_pmu_sbi.c   | 216 +++++++++++++++++++++++++++++++--
>>   include/linux/perf/riscv_pmu.h |   6 +
>>   3 files changed, 211 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/perf/riscv_pmu.c b/drivers/perf/riscv_pmu.c
>> index c78a6fd6c57f..3a941b2c3888 100644
>> --- a/drivers/perf/riscv_pmu.c
>> +++ b/drivers/perf/riscv_pmu.c
>> @@ -404,6 +404,7 @@ struct riscv_pmu *riscv_pmu_alloc(void)
>>   		cpuc->n_events = 0;
>>   		for (i = 0; i < RISCV_MAX_COUNTERS; i++)
>>   			cpuc->events[i] = NULL;
>> +		cpuc->snapshot_addr = NULL;
>>   	}
>>   	pmu->pmu = (struct pmu) {
>>   		.event_init	= riscv_pmu_event_init,
>> diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c
>> index a83ae82301e3..8c3475d55433 100644
>> --- a/drivers/perf/riscv_pmu_sbi.c
>> +++ b/drivers/perf/riscv_pmu_sbi.c
>> @@ -58,6 +58,9 @@ PMU_FORMAT_ATTR(event, "config:0-47");
>>   PMU_FORMAT_ATTR(firmware, "config:63");
>>   
>>   static bool sbi_v2_available;
>> +static DEFINE_STATIC_KEY_FALSE(sbi_pmu_snapshot_available);
>> +#define sbi_pmu_snapshot_available() \
>> +	static_branch_unlikely(&sbi_pmu_snapshot_available)
>>   
>>   static struct attribute *riscv_arch_formats_attr[] = {
>>   	&format_attr_event.attr,
>> @@ -508,14 +511,108 @@ static int pmu_sbi_event_map(struct perf_event *event, u64 *econfig)
>>   	return ret;
>>   }
>>   
>> +static void pmu_sbi_snapshot_free(struct riscv_pmu *pmu)
>> +{
>> +	int cpu;
>> +
>> +	for_each_possible_cpu(cpu) {
>> +		struct cpu_hw_events *cpu_hw_evt = per_cpu_ptr(pmu->hw_events, cpu);
>> +
>> +		if (!cpu_hw_evt->snapshot_addr)
>> +			continue;
>> +
>> +		free_page((unsigned long)cpu_hw_evt->snapshot_addr);
>> +		cpu_hw_evt->snapshot_addr = NULL;
>> +		cpu_hw_evt->snapshot_addr_phys = 0;
>> +	}
>> +}
>> +
>> +static int pmu_sbi_snapshot_alloc(struct riscv_pmu *pmu)
>> +{
>> +	int cpu;
>> +	struct page *snapshot_page;
>> +
>> +	for_each_possible_cpu(cpu) {
>> +		struct cpu_hw_events *cpu_hw_evt = per_cpu_ptr(pmu->hw_events, cpu);
>> +
>> +		if (cpu_hw_evt->snapshot_addr)
>> +			continue;
>> +
>> +		snapshot_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
>> +		if (!snapshot_page) {
>> +			pmu_sbi_snapshot_free(pmu);
>> +			return -ENOMEM;
>> +		}
>> +		cpu_hw_evt->snapshot_addr = page_to_virt(snapshot_page);
>> +		cpu_hw_evt->snapshot_addr_phys = page_to_phys(snapshot_page);
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int pmu_sbi_snapshot_disable(void)
>> +{
>> +	struct sbiret ret;
>> +
>> +	ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_SNAPSHOT_SET_SHMEM, -1,
>> +			-1, 0, 0, 0, 0);
>> +	if (ret.error) {
>> +		pr_warn("failed to disable snapshot shared memory\n");
>> +		return sbi_err_map_linux_errno(ret.error);
>> +	}
> 
> Also need to set snapshot_set_done to false, but I'm not yet convinced

Done.

> that we need snapshot_set_done, especially if we don't allow
> snapshot_addr_phys to be zero, since zero can then mean set-not-done,
> but ~0UL is probably a better invalid physical address choice than zero.
> 

Agreed. But I don't see any benefit either way. snapshot_set_done is 
just more explicit way of doing the same thing without interpreting what 
zero means.

If you think there is a benefit or you feel storngly about it, I can 
change it you suggested approach.

Btw, I just realized that you had a comment about this in v4 as well. 
Sorry I missed that and did not reply there.


>> +
>> +	return 0;
>> +}
>> +
>> +static int pmu_sbi_snapshot_setup(struct riscv_pmu *pmu, int cpu)
>> +{
>> +	struct cpu_hw_events *cpu_hw_evt;
>> +	struct sbiret ret = {0};
>> +
>> +	cpu_hw_evt = per_cpu_ptr(pmu->hw_events, cpu);
>> +	if (!cpu_hw_evt->snapshot_addr_phys)
>> +		return -EINVAL;
>> +
>> +	if (cpu_hw_evt->snapshot_set_done)
>> +		return 0;
>> +
>> +	if (IS_ENABLED(CONFIG_32BIT))
>> +		ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_SNAPSHOT_SET_SHMEM,
>> +				cpu_hw_evt->snapshot_addr_phys,
>> +				(u64)(cpu_hw_evt->snapshot_addr_phys) >> 32, 0, 0, 0, 0);
>> +	else
>> +		ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_SNAPSHOT_SET_SHMEM,
>> +				cpu_hw_evt->snapshot_addr_phys, 0, 0, 0, 0, 0);
>> +
>> +	/* Free up the snapshot area memory and fall back to SBI PMU calls without snapshot */
>> +	if (ret.error) {
>> +		if (ret.error != SBI_ERR_NOT_SUPPORTED)
>> +			pr_warn("pmu snapshot setup failed with error %ld\n", ret.error);
>> +		return sbi_err_map_linux_errno(ret.error);
>> +	}
>> +
>> +	cpu_hw_evt->snapshot_set_done = true;
>> +
>> +	return 0;
>> +}
>> +
>>   static u64 pmu_sbi_ctr_read(struct perf_event *event)
>>   {
>>   	struct hw_perf_event *hwc = &event->hw;
>>   	int idx = hwc->idx;
>>   	struct sbiret ret;
>>   	u64 val = 0;
>> +	struct riscv_pmu *pmu = to_riscv_pmu(event->pmu);
>> +	struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
>> +	struct riscv_pmu_snapshot_data *sdata = cpu_hw_evt->snapshot_addr;
>>   	union sbi_pmu_ctr_info info = pmu_ctr_list[idx];
>>   
>> +	/* Read the value from the shared memory directly */
>> +	if (sbi_pmu_snapshot_available()) {
>> +		val = sdata->ctr_values[idx];
>> +		return val;
>> +	}
>> +
>>   	if (pmu_sbi_is_fw_event(event)) {
>>   		ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_FW_READ,
>>   				hwc->idx, 0, 0, 0, 0, 0);
>> @@ -565,6 +662,7 @@ static void pmu_sbi_ctr_start(struct perf_event *event, u64 ival)
>>   	struct hw_perf_event *hwc = &event->hw;
>>   	unsigned long flag = SBI_PMU_START_FLAG_SET_INIT_VALUE;
>>   
>> +	/* There is no benefit setting SNAPSHOT FLAG for a single counter */
>>   #if defined(CONFIG_32BIT)
>>   	ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, hwc->idx,
>>   			1, flag, ival, ival >> 32, 0);
>> @@ -585,16 +683,36 @@ static void pmu_sbi_ctr_stop(struct perf_event *event, unsigned long flag)
>>   {
>>   	struct sbiret ret;
>>   	struct hw_perf_event *hwc = &event->hw;
>> +	struct riscv_pmu *pmu = to_riscv_pmu(event->pmu);
>> +	struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
>> +	struct riscv_pmu_snapshot_data *sdata = cpu_hw_evt->snapshot_addr;
>>   
>>   	if ((hwc->flags & PERF_EVENT_FLAG_USER_ACCESS) &&
>>   	    (hwc->flags & PERF_EVENT_FLAG_USER_READ_CNT))
>>   		pmu_sbi_reset_scounteren((void *)event);
>>   
>> +	if (sbi_pmu_snapshot_available())
>> +		flag |= SBI_PMU_STOP_FLAG_TAKE_SNAPSHOT;
>> +
>>   	ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_STOP, hwc->idx, 1, flag, 0, 0, 0);
>> -	if (ret.error && (ret.error != SBI_ERR_ALREADY_STOPPED) &&
>> -		flag != SBI_PMU_STOP_FLAG_RESET)
>> +	if (!ret.error && sbi_pmu_snapshot_available()) {
>> +		/*
>> +		 * The counter snapshot is based on the index base specified by hwc->idx.
>> +		 * The actual counter value is updated in shared memory at index 0 when counter
>> +		 * mask is 0x01. To ensure accurate counter values, it's necessary to transfer
>> +		 * the counter value to shared memory. However, if hwc->idx is zero, the counter
>> +		 * value is already correctly updated in shared memory, requiring no further
>> +		 * adjustment.
>> +		 */
>> +		if (hwc->idx > 0) {
>> +			sdata->ctr_values[hwc->idx] = sdata->ctr_values[0];
>> +			sdata->ctr_values[0] = 0;
>> +		}
>> +	} else if (ret.error && (ret.error != SBI_ERR_ALREADY_STOPPED) &&
>> +		flag != SBI_PMU_STOP_FLAG_RESET) {
>>   		pr_err("Stopping counter idx %d failed with error %d\n",
>>   			hwc->idx, sbi_err_map_linux_errno(ret.error));
>> +	}
>>   }
>>   
>>   static int pmu_sbi_find_num_ctrs(void)
>> @@ -652,10 +770,14 @@ static inline void pmu_sbi_stop_all(struct riscv_pmu *pmu)
>>   static inline void pmu_sbi_stop_hw_ctrs(struct riscv_pmu *pmu)
>>   {
>>   	struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
>> +	unsigned long flag = 0;
>> +
>> +	if (sbi_pmu_snapshot_available())
>> +		flag = SBI_PMU_STOP_FLAG_TAKE_SNAPSHOT;
>>   
>>   	/* No need to check the error here as we can't do anything about the error */
>>   	sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_STOP, 0,
>> -		  cpu_hw_evt->used_hw_ctrs[0], 0, 0, 0, 0);
>> +		  cpu_hw_evt->used_hw_ctrs[0], flag, 0, 0, 0);
>>   }
>>   
>>   /*
>> @@ -664,11 +786,10 @@ static inline void pmu_sbi_stop_hw_ctrs(struct riscv_pmu *pmu)
>>    * while the overflowed counters need to be started with updated initialization
>>    * value.
>>    */
>> -static inline void pmu_sbi_start_overflow_mask(struct riscv_pmu *pmu,
>> -					       unsigned long ctr_ovf_mask)
>> +static noinline void pmu_sbi_start_ovf_ctrs_sbi(struct cpu_hw_events *cpu_hw_evt,
>> +						unsigned long ctr_ovf_mask)
>>   {
>>   	int idx = 0;
>> -	struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
>>   	struct perf_event *event;
>>   	unsigned long flag = SBI_PMU_START_FLAG_SET_INIT_VALUE;
>>   	unsigned long ctr_start_mask = 0;
>> @@ -703,6 +824,48 @@ static inline void pmu_sbi_start_overflow_mask(struct riscv_pmu *pmu,
>>   	}
>>   }
>>   
>> +static noinline void pmu_sbi_start_ovf_ctrs_snapshot(struct cpu_hw_events *cpu_hw_evt,
>> +						     unsigned long ctr_ovf_mask)
>> +{
>> +	int idx = 0;
>> +	struct perf_event *event;
>> +	unsigned long flag = SBI_PMU_START_FLAG_INIT_SNAPSHOT;
>> +	u64 max_period, init_val = 0;
>> +	struct hw_perf_event *hwc;
>> +	struct riscv_pmu_snapshot_data *sdata = cpu_hw_evt->snapshot_addr;
>> +
>> +	for_each_set_bit(idx, cpu_hw_evt->used_hw_ctrs, RISCV_MAX_COUNTERS) {
>> +		if (ctr_ovf_mask & (BIT(idx))) {
> 
> Unnecessary () around BIT()
> 

Fixed.

>> +			event = cpu_hw_evt->events[idx];
>> +			hwc = &event->hw;
>> +			max_period = riscv_pmu_ctr_get_width_mask(event);
>> +			init_val = local64_read(&hwc->prev_count) & max_period;
>> +			sdata->ctr_values[idx] = init_val;
>> +		}
>> +		/*
>> +		 * We do not need to update the non-overflow counters the previous
>> +		 * value should have been there already.
>> +		 */
>> +	}
>> +
>> +	for (idx = 0; idx < BITS_TO_LONGS(RISCV_MAX_COUNTERS); idx++) {
>> +		/* Start all the counters in a single shot */
>> +		sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, idx * BITS_PER_LONG,
>> +			  cpu_hw_evt->used_hw_ctrs[idx], flag, 0, 0, 0);
>> +	}
>> +}
>> +
>> +static void pmu_sbi_start_overflow_mask(struct riscv_pmu *pmu,
>> +					unsigned long ctr_ovf_mask)
>> +{
>> +	struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
>> +
>> +	if (sbi_pmu_snapshot_available())
>> +		pmu_sbi_start_ovf_ctrs_snapshot(cpu_hw_evt, ctr_ovf_mask);
>> +	else
>> +		pmu_sbi_start_ovf_ctrs_sbi(cpu_hw_evt, ctr_ovf_mask);
>> +}
>> +
>>   static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev)
>>   {
>>   	struct perf_sample_data data;
>> @@ -716,6 +879,7 @@ static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev)
>>   	unsigned long overflowed_ctrs = 0;
>>   	struct cpu_hw_events *cpu_hw_evt = dev;
>>   	u64 start_clock = sched_clock();
>> +	struct riscv_pmu_snapshot_data *sdata = cpu_hw_evt->snapshot_addr;
>>   
>>   	if (WARN_ON_ONCE(!cpu_hw_evt))
>>   		return IRQ_NONE;
>> @@ -737,8 +901,10 @@ static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev)
>>   	pmu_sbi_stop_hw_ctrs(pmu);
>>   
>>   	/* Overflow status register should only be read after counter are stopped */
>> -	ALT_SBI_PMU_OVERFLOW(overflow);
>> -
>> +	if (sbi_pmu_snapshot_available())
>> +		overflow = sdata->ctr_overflow_mask;
>> +	else
>> +		ALT_SBI_PMU_OVERFLOW(overflow);
>>   	/*
>>   	 * Overflow interrupt pending bit should only be cleared after stopping
>>   	 * all the counters to avoid any race condition.
>> @@ -819,6 +985,9 @@ static int pmu_sbi_starting_cpu(unsigned int cpu, struct hlist_node *node)
>>   		enable_percpu_irq(riscv_pmu_irq, IRQ_TYPE_NONE);
>>   	}
>>   
>> +	if (sbi_pmu_snapshot_available())
>> +		return pmu_sbi_snapshot_setup(pmu, cpu);
>> +
>>   	return 0;
>>   }
>>   
>> @@ -831,6 +1000,9 @@ static int pmu_sbi_dying_cpu(unsigned int cpu, struct hlist_node *node)
>>   	/* Disable all counters access for user mode now */
>>   	csr_write(CSR_SCOUNTEREN, 0x0);
>>   
>> +	if (sbi_pmu_snapshot_available())
>> +		return pmu_sbi_snapshot_disable();
>> +
>>   	return 0;
>>   }
>>   
>> @@ -1106,10 +1278,6 @@ static int pmu_sbi_device_probe(struct platform_device *pdev)
>>   	pmu->event_unmapped = pmu_sbi_event_unmapped;
>>   	pmu->csr_index = pmu_sbi_csr_index;
>>   
>> -	ret = cpuhp_state_add_instance(CPUHP_AP_PERF_RISCV_STARTING, &pmu->node);
>> -	if (ret)
>> -		return ret;
>> -
>>   	ret = riscv_pm_pmu_register(pmu);
>>   	if (ret)
>>   		goto out_unregister;
>> @@ -1118,8 +1286,32 @@ static int pmu_sbi_device_probe(struct platform_device *pdev)
>>   	if (ret)
>>   		goto out_unregister;
>>   
>> +	/* SBI PMU Snapsphot is only available in SBI v2.0 */
>> +	if (sbi_v2_available) {
>> +		ret = pmu_sbi_snapshot_alloc(pmu);
>> +		if (ret)
>> +			goto out_unregister;
>> +
>> +		ret = pmu_sbi_snapshot_setup(pmu, smp_processor_id());
>> +		if (!ret) {
>> +			pr_info("SBI PMU snapshot detected\n");
>> +			/*
>> +			 * We enable it once here for the boot cpu. If snapshot shmem setup
>> +			 * fails during cpu hotplug process, it will fail to start the cpu
>> +			 * as we can not handle hetergenous PMUs with different snapshot
>> +			 * capability.
>> +			 */
>> +			static_branch_enable(&sbi_pmu_snapshot_available);
>> +		}
>> +		/* Snapshot is an optional feature. Continue if not available */
>> +	}
>> +
>>   	register_sysctl("kernel", sbi_pmu_sysctl_table);
>>   
>> +	ret = cpuhp_state_add_instance(CPUHP_AP_PERF_RISCV_STARTING, &pmu->node);
>> +	if (ret)
>> +		return ret;
> 
> This should be goto out_unregister, and in the case of sbi_v2_available we
> also need a pmu_sbi_snapshot_free() and a pmu_sbi_snapshot_disable().
> 

Yes. Thanks for catching it. Fixed

>> +
>>   	return 0;
>>   
>>   out_unregister:
>> diff --git a/include/linux/perf/riscv_pmu.h b/include/linux/perf/riscv_pmu.h
>> index 43282e22ebe1..c3fa90970042 100644
>> --- a/include/linux/perf/riscv_pmu.h
>> +++ b/include/linux/perf/riscv_pmu.h
>> @@ -39,6 +39,12 @@ struct cpu_hw_events {
>>   	DECLARE_BITMAP(used_hw_ctrs, RISCV_MAX_COUNTERS);
>>   	/* currently enabled firmware counters */
>>   	DECLARE_BITMAP(used_fw_ctrs, RISCV_MAX_COUNTERS);
>> +	/* The virtual address of the shared memory where counter snapshot will be taken */
>> +	void *snapshot_addr;
>> +	/* The physical address of the shared memory where counter snapshot will be taken */
>> +	phys_addr_t snapshot_addr_phys;
>> +	/* Boolean flag to indicate setup is already done */
>> +	bool snapshot_set_done;
>>   };
>>   
>>   struct riscv_pmu {
>> -- 
>> 2.34.1
>>
> 
> Thanks,
> drew
Andrew Jones April 11, 2024, 7:45 a.m. UTC | #5 
On Wed, Apr 10, 2024 at 03:29:21PM -0700, Atish Patra wrote:
> On 4/4/24 04:52, Andrew Jones wrote:
> > On Wed, Apr 03, 2024 at 01:04:35AM -0700, Atish Patra wrote:
...
> > > +static int pmu_sbi_snapshot_disable(void)
> > > +{
> > > +	struct sbiret ret;
> > > +
> > > +	ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_SNAPSHOT_SET_SHMEM, -1,
> > > +			-1, 0, 0, 0, 0);
> > > +	if (ret.error) {
> > > +		pr_warn("failed to disable snapshot shared memory\n");
> > > +		return sbi_err_map_linux_errno(ret.error);
> > > +	}
> > 
> > Also need to set snapshot_set_done to false, but I'm not yet convinced
> 
> Done.
> 
> > that we need snapshot_set_done, especially if we don't allow
> > snapshot_addr_phys to be zero, since zero can then mean set-not-done,
> > but ~0UL is probably a better invalid physical address choice than zero.
> > 
> 
> Agreed. But I don't see any benefit either way. snapshot_set_done is just
> more explicit way of doing the same thing without interpreting what zero
> means.
> 
> If you think there is a benefit or you feel storngly about it, I can change
> it you suggested approach.
>

I don't have a strong opinion on it. I'm just reluctant to add redundant
state, not only because it increases size, but also because we have to
keep track of it, like in the example above, where we needed to remember
to reset the extra state to false.

Of course, giving invalid addresses additional meanings also comes with
its own code maintenance trade-offs, so either way...

Thanks,
drew
diff mbox series

Patch

diff --git a/drivers/perf/riscv_pmu.c b/drivers/perf/riscv_pmu.c
index c78a6fd6c57f..3a941b2c3888 100644
--- a/drivers/perf/riscv_pmu.c
+++ b/drivers/perf/riscv_pmu.c
@@ -404,6 +404,7 @@  struct riscv_pmu *riscv_pmu_alloc(void)
 		cpuc->n_events = 0;
 		for (i = 0; i < RISCV_MAX_COUNTERS; i++)
 			cpuc->events[i] = NULL;
+		cpuc->snapshot_addr = NULL;
 	}
 	pmu->pmu = (struct pmu) {
 		.event_init	= riscv_pmu_event_init,
diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c
index a83ae82301e3..8c3475d55433 100644
--- a/drivers/perf/riscv_pmu_sbi.c
+++ b/drivers/perf/riscv_pmu_sbi.c
@@ -58,6 +58,9 @@  PMU_FORMAT_ATTR(event, "config:0-47");
 PMU_FORMAT_ATTR(firmware, "config:63");
 
 static bool sbi_v2_available;
+static DEFINE_STATIC_KEY_FALSE(sbi_pmu_snapshot_available);
+#define sbi_pmu_snapshot_available() \
+	static_branch_unlikely(&sbi_pmu_snapshot_available)
 
 static struct attribute *riscv_arch_formats_attr[] = {
 	&format_attr_event.attr,
@@ -508,14 +511,108 @@  static int pmu_sbi_event_map(struct perf_event *event, u64 *econfig)
 	return ret;
 }
 
+static void pmu_sbi_snapshot_free(struct riscv_pmu *pmu)
+{
+	int cpu;
+
+	for_each_possible_cpu(cpu) {
+		struct cpu_hw_events *cpu_hw_evt = per_cpu_ptr(pmu->hw_events, cpu);
+
+		if (!cpu_hw_evt->snapshot_addr)
+			continue;
+
+		free_page((unsigned long)cpu_hw_evt->snapshot_addr);
+		cpu_hw_evt->snapshot_addr = NULL;
+		cpu_hw_evt->snapshot_addr_phys = 0;
+	}
+}
+
+static int pmu_sbi_snapshot_alloc(struct riscv_pmu *pmu)
+{
+	int cpu;
+	struct page *snapshot_page;
+
+	for_each_possible_cpu(cpu) {
+		struct cpu_hw_events *cpu_hw_evt = per_cpu_ptr(pmu->hw_events, cpu);
+
+		if (cpu_hw_evt->snapshot_addr)
+			continue;
+
+		snapshot_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
+		if (!snapshot_page) {
+			pmu_sbi_snapshot_free(pmu);
+			return -ENOMEM;
+		}
+		cpu_hw_evt->snapshot_addr = page_to_virt(snapshot_page);
+		cpu_hw_evt->snapshot_addr_phys = page_to_phys(snapshot_page);
+	}
+
+	return 0;
+}
+
+static int pmu_sbi_snapshot_disable(void)
+{
+	struct sbiret ret;
+
+	ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_SNAPSHOT_SET_SHMEM, -1,
+			-1, 0, 0, 0, 0);
+	if (ret.error) {
+		pr_warn("failed to disable snapshot shared memory\n");
+		return sbi_err_map_linux_errno(ret.error);
+	}
+
+	return 0;
+}
+
+static int pmu_sbi_snapshot_setup(struct riscv_pmu *pmu, int cpu)
+{
+	struct cpu_hw_events *cpu_hw_evt;
+	struct sbiret ret = {0};
+
+	cpu_hw_evt = per_cpu_ptr(pmu->hw_events, cpu);
+	if (!cpu_hw_evt->snapshot_addr_phys)
+		return -EINVAL;
+
+	if (cpu_hw_evt->snapshot_set_done)
+		return 0;
+
+	if (IS_ENABLED(CONFIG_32BIT))
+		ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_SNAPSHOT_SET_SHMEM,
+				cpu_hw_evt->snapshot_addr_phys,
+				(u64)(cpu_hw_evt->snapshot_addr_phys) >> 32, 0, 0, 0, 0);
+	else
+		ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_SNAPSHOT_SET_SHMEM,
+				cpu_hw_evt->snapshot_addr_phys, 0, 0, 0, 0, 0);
+
+	/* Free up the snapshot area memory and fall back to SBI PMU calls without snapshot */
+	if (ret.error) {
+		if (ret.error != SBI_ERR_NOT_SUPPORTED)
+			pr_warn("pmu snapshot setup failed with error %ld\n", ret.error);
+		return sbi_err_map_linux_errno(ret.error);
+	}
+
+	cpu_hw_evt->snapshot_set_done = true;
+
+	return 0;
+}
+
 static u64 pmu_sbi_ctr_read(struct perf_event *event)
 {
 	struct hw_perf_event *hwc = &event->hw;
 	int idx = hwc->idx;
 	struct sbiret ret;
 	u64 val = 0;
+	struct riscv_pmu *pmu = to_riscv_pmu(event->pmu);
+	struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
+	struct riscv_pmu_snapshot_data *sdata = cpu_hw_evt->snapshot_addr;
 	union sbi_pmu_ctr_info info = pmu_ctr_list[idx];
 
+	/* Read the value from the shared memory directly */
+	if (sbi_pmu_snapshot_available()) {
+		val = sdata->ctr_values[idx];
+		return val;
+	}
+
 	if (pmu_sbi_is_fw_event(event)) {
 		ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_FW_READ,
 				hwc->idx, 0, 0, 0, 0, 0);
@@ -565,6 +662,7 @@  static void pmu_sbi_ctr_start(struct perf_event *event, u64 ival)
 	struct hw_perf_event *hwc = &event->hw;
 	unsigned long flag = SBI_PMU_START_FLAG_SET_INIT_VALUE;
 
+	/* There is no benefit setting SNAPSHOT FLAG for a single counter */
 #if defined(CONFIG_32BIT)
 	ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, hwc->idx,
 			1, flag, ival, ival >> 32, 0);
@@ -585,16 +683,36 @@  static void pmu_sbi_ctr_stop(struct perf_event *event, unsigned long flag)
 {
 	struct sbiret ret;
 	struct hw_perf_event *hwc = &event->hw;
+	struct riscv_pmu *pmu = to_riscv_pmu(event->pmu);
+	struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
+	struct riscv_pmu_snapshot_data *sdata = cpu_hw_evt->snapshot_addr;
 
 	if ((hwc->flags & PERF_EVENT_FLAG_USER_ACCESS) &&
 	    (hwc->flags & PERF_EVENT_FLAG_USER_READ_CNT))
 		pmu_sbi_reset_scounteren((void *)event);
 
+	if (sbi_pmu_snapshot_available())
+		flag |= SBI_PMU_STOP_FLAG_TAKE_SNAPSHOT;
+
 	ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_STOP, hwc->idx, 1, flag, 0, 0, 0);
-	if (ret.error && (ret.error != SBI_ERR_ALREADY_STOPPED) &&
-		flag != SBI_PMU_STOP_FLAG_RESET)
+	if (!ret.error && sbi_pmu_snapshot_available()) {
+		/*
+		 * The counter snapshot is based on the index base specified by hwc->idx.
+		 * The actual counter value is updated in shared memory at index 0 when counter
+		 * mask is 0x01. To ensure accurate counter values, it's necessary to transfer
+		 * the counter value to shared memory. However, if hwc->idx is zero, the counter
+		 * value is already correctly updated in shared memory, requiring no further
+		 * adjustment.
+		 */
+		if (hwc->idx > 0) {
+			sdata->ctr_values[hwc->idx] = sdata->ctr_values[0];
+			sdata->ctr_values[0] = 0;
+		}
+	} else if (ret.error && (ret.error != SBI_ERR_ALREADY_STOPPED) &&
+		flag != SBI_PMU_STOP_FLAG_RESET) {
 		pr_err("Stopping counter idx %d failed with error %d\n",
 			hwc->idx, sbi_err_map_linux_errno(ret.error));
+	}
 }
 
 static int pmu_sbi_find_num_ctrs(void)
@@ -652,10 +770,14 @@  static inline void pmu_sbi_stop_all(struct riscv_pmu *pmu)
 static inline void pmu_sbi_stop_hw_ctrs(struct riscv_pmu *pmu)
 {
 	struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
+	unsigned long flag = 0;
+
+	if (sbi_pmu_snapshot_available())
+		flag = SBI_PMU_STOP_FLAG_TAKE_SNAPSHOT;
 
 	/* No need to check the error here as we can't do anything about the error */
 	sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_STOP, 0,
-		  cpu_hw_evt->used_hw_ctrs[0], 0, 0, 0, 0);
+		  cpu_hw_evt->used_hw_ctrs[0], flag, 0, 0, 0);
 }
 
 /*
@@ -664,11 +786,10 @@  static inline void pmu_sbi_stop_hw_ctrs(struct riscv_pmu *pmu)
  * while the overflowed counters need to be started with updated initialization
  * value.
  */
-static inline void pmu_sbi_start_overflow_mask(struct riscv_pmu *pmu,
-					       unsigned long ctr_ovf_mask)
+static noinline void pmu_sbi_start_ovf_ctrs_sbi(struct cpu_hw_events *cpu_hw_evt,
+						unsigned long ctr_ovf_mask)
 {
 	int idx = 0;
-	struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
 	struct perf_event *event;
 	unsigned long flag = SBI_PMU_START_FLAG_SET_INIT_VALUE;
 	unsigned long ctr_start_mask = 0;
@@ -703,6 +824,48 @@  static inline void pmu_sbi_start_overflow_mask(struct riscv_pmu *pmu,
 	}
 }
 
+static noinline void pmu_sbi_start_ovf_ctrs_snapshot(struct cpu_hw_events *cpu_hw_evt,
+						     unsigned long ctr_ovf_mask)
+{
+	int idx = 0;
+	struct perf_event *event;
+	unsigned long flag = SBI_PMU_START_FLAG_INIT_SNAPSHOT;
+	u64 max_period, init_val = 0;
+	struct hw_perf_event *hwc;
+	struct riscv_pmu_snapshot_data *sdata = cpu_hw_evt->snapshot_addr;
+
+	for_each_set_bit(idx, cpu_hw_evt->used_hw_ctrs, RISCV_MAX_COUNTERS) {
+		if (ctr_ovf_mask & (BIT(idx))) {
+			event = cpu_hw_evt->events[idx];
+			hwc = &event->hw;
+			max_period = riscv_pmu_ctr_get_width_mask(event);
+			init_val = local64_read(&hwc->prev_count) & max_period;
+			sdata->ctr_values[idx] = init_val;
+		}
+		/*
+		 * We do not need to update the non-overflow counters the previous
+		 * value should have been there already.
+		 */
+	}
+
+	for (idx = 0; idx < BITS_TO_LONGS(RISCV_MAX_COUNTERS); idx++) {
+		/* Start all the counters in a single shot */
+		sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, idx * BITS_PER_LONG,
+			  cpu_hw_evt->used_hw_ctrs[idx], flag, 0, 0, 0);
+	}
+}
+
+static void pmu_sbi_start_overflow_mask(struct riscv_pmu *pmu,
+					unsigned long ctr_ovf_mask)
+{
+	struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
+
+	if (sbi_pmu_snapshot_available())
+		pmu_sbi_start_ovf_ctrs_snapshot(cpu_hw_evt, ctr_ovf_mask);
+	else
+		pmu_sbi_start_ovf_ctrs_sbi(cpu_hw_evt, ctr_ovf_mask);
+}
+
 static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev)
 {
 	struct perf_sample_data data;
@@ -716,6 +879,7 @@  static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev)
 	unsigned long overflowed_ctrs = 0;
 	struct cpu_hw_events *cpu_hw_evt = dev;
 	u64 start_clock = sched_clock();
+	struct riscv_pmu_snapshot_data *sdata = cpu_hw_evt->snapshot_addr;
 
 	if (WARN_ON_ONCE(!cpu_hw_evt))
 		return IRQ_NONE;
@@ -737,8 +901,10 @@  static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev)
 	pmu_sbi_stop_hw_ctrs(pmu);
 
 	/* Overflow status register should only be read after counter are stopped */
-	ALT_SBI_PMU_OVERFLOW(overflow);
-
+	if (sbi_pmu_snapshot_available())
+		overflow = sdata->ctr_overflow_mask;
+	else
+		ALT_SBI_PMU_OVERFLOW(overflow);
 	/*
 	 * Overflow interrupt pending bit should only be cleared after stopping
 	 * all the counters to avoid any race condition.
@@ -819,6 +985,9 @@  static int pmu_sbi_starting_cpu(unsigned int cpu, struct hlist_node *node)
 		enable_percpu_irq(riscv_pmu_irq, IRQ_TYPE_NONE);
 	}
 
+	if (sbi_pmu_snapshot_available())
+		return pmu_sbi_snapshot_setup(pmu, cpu);
+
 	return 0;
 }
 
@@ -831,6 +1000,9 @@  static int pmu_sbi_dying_cpu(unsigned int cpu, struct hlist_node *node)
 	/* Disable all counters access for user mode now */
 	csr_write(CSR_SCOUNTEREN, 0x0);
 
+	if (sbi_pmu_snapshot_available())
+		return pmu_sbi_snapshot_disable();
+
 	return 0;
 }
 
@@ -1106,10 +1278,6 @@  static int pmu_sbi_device_probe(struct platform_device *pdev)
 	pmu->event_unmapped = pmu_sbi_event_unmapped;
 	pmu->csr_index = pmu_sbi_csr_index;
 
-	ret = cpuhp_state_add_instance(CPUHP_AP_PERF_RISCV_STARTING, &pmu->node);
-	if (ret)
-		return ret;
-
 	ret = riscv_pm_pmu_register(pmu);
 	if (ret)
 		goto out_unregister;
@@ -1118,8 +1286,32 @@  static int pmu_sbi_device_probe(struct platform_device *pdev)
 	if (ret)
 		goto out_unregister;
 
+	/* SBI PMU Snapsphot is only available in SBI v2.0 */
+	if (sbi_v2_available) {
+		ret = pmu_sbi_snapshot_alloc(pmu);
+		if (ret)
+			goto out_unregister;
+
+		ret = pmu_sbi_snapshot_setup(pmu, smp_processor_id());
+		if (!ret) {
+			pr_info("SBI PMU snapshot detected\n");
+			/*
+			 * We enable it once here for the boot cpu. If snapshot shmem setup
+			 * fails during cpu hotplug process, it will fail to start the cpu
+			 * as we can not handle hetergenous PMUs with different snapshot
+			 * capability.
+			 */
+			static_branch_enable(&sbi_pmu_snapshot_available);
+		}
+		/* Snapshot is an optional feature. Continue if not available */
+	}
+
 	register_sysctl("kernel", sbi_pmu_sysctl_table);
 
+	ret = cpuhp_state_add_instance(CPUHP_AP_PERF_RISCV_STARTING, &pmu->node);
+	if (ret)
+		return ret;
+
 	return 0;
 
 out_unregister:
diff --git a/include/linux/perf/riscv_pmu.h b/include/linux/perf/riscv_pmu.h
index 43282e22ebe1..c3fa90970042 100644
--- a/include/linux/perf/riscv_pmu.h
+++ b/include/linux/perf/riscv_pmu.h
@@ -39,6 +39,12 @@  struct cpu_hw_events {
 	DECLARE_BITMAP(used_hw_ctrs, RISCV_MAX_COUNTERS);
 	/* currently enabled firmware counters */
 	DECLARE_BITMAP(used_fw_ctrs, RISCV_MAX_COUNTERS);
+	/* The virtual address of the shared memory where counter snapshot will be taken */
+	void *snapshot_addr;
+	/* The physical address of the shared memory where counter snapshot will be taken */
+	phys_addr_t snapshot_addr_phys;
+	/* Boolean flag to indicate setup is already done */
+	bool snapshot_set_done;
 };
 
 struct riscv_pmu {