diff mbox series

[6/6] drm/i915/perf: Map OA buffer to user space for gen12 performance query

Message ID 20200730004826.8415-7-umesh.nerlige.ramappa@intel.com (mailing list archive)
State New, archived
Headers show
Series Allow privileged user to map the OA buffer | expand

Commit Message

Umesh Nerlige Ramappa July 30, 2020, 12:48 a.m. UTC 
From: Piotr Maciejewski <piotr.maciejewski@intel.com>

i915 used to support time based sampling mode which is good for overall
system monitoring, but is not enough for query mode used to measure a
single draw call or dispatch. Gen9-Gen11 are using current i915 perf
implementation for query, but Gen12+ requires a new approach for query
based on triggered reports within oa buffer.

Triggering reports into the OA buffer is achieved by writing into a
a trigger register. Optionally an unused counter/register is set with a
marker value such that a triggered report can be identified in the OA
buffer. Reports are usually triggered at the start and end of work that
is measured.

Since OA buffer is large and queries can be frequent, an efficient way
to look for triggered reports is required. By knowing the current head
and tail offsets into the OA buffer, it is easier to determine the
locality of the reports of interest.

Current perf OA interface does not expose head/tail information to the
user and it filters out invalid reports before sending data to user.
Also considering limited size of user buffer used during a query,
creating a 1:1 copy of the OA buffer at the user space added undesired
complexity.

The solution was to map the OA buffer to user space provided

(1) that it is accessed from a privileged user.
(2) OA report filtering is not used.

These 2 conditions would satisfy the safety criteria that the current
perf interface addresses.

To enable the query:
- Add an ioctl to expose head and tail to the user
- Add an ioctl to return size and offset of the OA buffer
- Map the OA buffer to the user space

v2:
- Improve commit message (Chris)
- Do not mmap based on gem object filp. Instead, use perf_fd and support
  mmap syscall (Chris)
- Pass non-zero offset in mmap to enforce the right object is
  mapped (Chris)
- Do not expose gpu_address (Chris)
- Verify start and length of vma for page alignment (Lionel)
- Move SQNTL config out (Lionel)

v3: (Chris)
- Omit redundant checks
- Return VM_FAULT_SIGBUS is old stream is closed
- Maintain reference counts to stream in vm_open and vm_close
- Use switch to identify object to be mapped

v4: Call kref_put on closing perf fd (Chris)
v5:
- Strip access to OA buffer from unprivileged child of a privileged
  parent. Use VM_DONTCOPY
- Enforce MAP_PRIVATE by checking for VM_MAYSHARE

v6:
(Chris)
- Use len of -1 in unmap_mapping_range
- Don't use stream->oa_buffer.vma->obj in vm_fault_oa
- Use kernel block comment style
- do_mmap gets a reference to the file and puts it in do_munmap, so
  no need to maintain a reference to i915_perf_stream. Hence, remove
  vm_open/vm_close and stream->closed hooks/checks.
(Umesh)
- Do not allow mmap if SAMPLE_OA_REPORT is not set during
  i915_perf_open_ioctl.
- Drop ioctl returning head/tail since this information is already
  whitelisted. Remove hooks to read head register.

Signed-off-by: Piotr Maciejewski <piotr.maciejewski@intel.com>
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_mman.c |   2 +-
 drivers/gpu/drm/i915/gem/i915_gem_mman.h |   2 +
 drivers/gpu/drm/i915/i915_perf.c         | 117 ++++++++++++++++++++++-
 include/uapi/drm/i915_drm.h              |  16 ++++
 4 files changed, 135 insertions(+), 2 deletions(-)

Comments

Chris Wilson July 30, 2020, 9 a.m. UTC | #1 
Quoting Umesh Nerlige Ramappa (2020-07-30 01:48:26)
> @@ -3318,12 +3354,87 @@ static int i915_perf_release(struct inode *inode, struct file *file)
>         i915_perf_destroy_locked(stream);
>         mutex_unlock(&perf->lock);
>  
> +       /*
> +        * User could have multiple vmas from multiple mmaps. We want to zap
> +        * them all here.
> +        */
> +       unmap_mapping_range(file->f_mapping, 0, -1, 1);

I'd prefer to explicitly revoke the mapping before removing the
stream->oa_buffer (i.e. at the start of the release before
i915_perf_destroy). That way it takes far less thought to convince
oneself that there is no window for accessing the stale PTE. Include a
comment to explain that a fresh fault cannot occur as the mmap holds a
reference to the stream (via the vma->vm_file), and so before the user's
munmap, the stream cannot be destroy.
-Chris
Chris Wilson July 30, 2020, 9:08 a.m. UTC | #2 
Quoting Umesh Nerlige Ramappa (2020-07-30 01:48:26)
>  #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index 00546062e023..36f6b9799ecd 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -2048,6 +2048,22 @@ struct drm_i915_perf_open_param {
>   */
>  #define I915_PERF_IOCTL_CONFIG _IO('i', 0x2)
>  
> +/**
> + * Returns OA buffer properties to be used with mmap.
> + *
> + * This ioctl is available in perf revision 8.
> + */
> +#define I915_PERF_IOCTL_GET_OA_BUFFER_INFO _IO('i', 0x3)

This should be _IORW iirc.

> +
> +/**
> + * OA buffer size and offset.
> + */
> +struct drm_i915_perf_oa_buffer_info {
> +       __u32 size;
> +       __u32 offset;
> +       __u64 reserved[4];

5xu64? Might as well just trim it to 4xu64. Unless you have a reason for
a large reserved, we can always extend the struct later (or replace it
with a new ioctl).

However, I would suggest {
	u32 type;  /* in */
	u32 flags; /* in */
	u64 size;   /* out */
	u64 offset; /* out */
	u64 rsvd; /* mbz */
};

Oh, and don't forget to check all unused members are 0.
-Chris
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
index b23368529a40..7c4b9b0c334b 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -204,7 +204,7 @@  compute_partial_view(const struct drm_i915_gem_object *obj,
 	return view;
 }
 
-static vm_fault_t i915_error_to_vmf_fault(int err)
+vm_fault_t i915_error_to_vmf_fault(int err)
 {
 	switch (err) {
 	default:
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.h b/drivers/gpu/drm/i915/gem/i915_gem_mman.h
index efee9e0d2508..1190a3a228ea 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.h
@@ -29,4 +29,6 @@  void i915_gem_object_release_mmap_gtt(struct drm_i915_gem_object *obj);
 
 void i915_gem_object_release_mmap_offset(struct drm_i915_gem_object *obj);
 
+vm_fault_t i915_error_to_vmf_fault(int err);
+
 #endif
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 9b55521cb09b..a995ebad0b17 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -192,10 +192,12 @@ 
  */
 
 #include <linux/anon_inodes.h>
+#include <linux/mman.h>
 #include <linux/sizes.h>
 #include <linux/uuid.h>
 
 #include "gem/i915_gem_context.h"
+#include "gem/i915_gem_mman.h"
 #include "gt/intel_engine_pm.h"
 #include "gt/intel_engine_user.h"
 #include "gt/intel_gt.h"
@@ -3218,6 +3220,38 @@  static long i915_perf_config_locked(struct i915_perf_stream *stream,
 	return ret;
 }
 
+#define I915_PERF_OA_BUFFER_MMAP_OFFSET 1
+
+/**
+ * i915_perf_oa_buffer_info_locked - size and offset of the OA buffer
+ * @stream: i915 perf stream
+ * @arg: pointer to oa buffer info filled by this function.
+ */
+static int i915_perf_oa_buffer_info_locked(struct i915_perf_stream *stream,
+					   unsigned long arg)
+{
+	struct drm_i915_perf_oa_buffer_info info;
+	void __user *output = (void __user *)arg;
+
+	if (i915_perf_stream_paranoid && !perfmon_capable()) {
+		DRM_DEBUG("Insufficient privileges to access OA buffer info\n");
+		return -EACCES;
+	}
+
+	if (!output)
+		return -EINVAL;
+
+	memset(&info, 0, sizeof(info));
+
+	info.size = stream->oa_buffer.vma->size;
+	info.offset = I915_PERF_OA_BUFFER_MMAP_OFFSET * PAGE_SIZE;
+
+	if (copy_to_user(output, &info, sizeof(info)))
+		return -EFAULT;
+
+	return 0;
+}
+
 /**
  * i915_perf_ioctl - support ioctl() usage with i915 perf stream FDs
  * @stream: An i915 perf stream
@@ -3243,6 +3277,8 @@  static long i915_perf_ioctl_locked(struct i915_perf_stream *stream,
 		return 0;
 	case I915_PERF_IOCTL_CONFIG:
 		return i915_perf_config_locked(stream, arg);
+	case I915_PERF_IOCTL_GET_OA_BUFFER_INFO:
+		return i915_perf_oa_buffer_info_locked(stream, arg);
 	}
 
 	return -EINVAL;
@@ -3318,12 +3354,87 @@  static int i915_perf_release(struct inode *inode, struct file *file)
 	i915_perf_destroy_locked(stream);
 	mutex_unlock(&perf->lock);
 
+	/*
+	 * User could have multiple vmas from multiple mmaps. We want to zap
+	 * them all here.
+	 */
+	unmap_mapping_range(file->f_mapping, 0, -1, 1);
+
 	/* Release the reference the perf stream kept on the driver. */
 	drm_dev_put(&perf->i915->drm);
 
 	return 0;
 }
 
+static vm_fault_t vm_fault_oa(struct vm_fault *vmf)
+{
+	struct vm_area_struct *vma = vmf->vma;
+	struct i915_perf_stream *stream = vma->vm_private_data;
+	int err;
+
+	err = remap_io_sg(vma,
+			  vma->vm_start, vma->vm_end - vma->vm_start,
+			  stream->oa_buffer.vma->pages->sgl, -1);
+
+	return i915_error_to_vmf_fault(err);
+}
+
+static const struct vm_operations_struct vm_ops_oa = {
+	.fault = vm_fault_oa,
+};
+
+int i915_perf_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	struct i915_perf_stream *stream = file->private_data;
+
+	/* mmap-ing OA buffer to user space MUST absolutely be privileged */
+	if (i915_perf_stream_paranoid && !perfmon_capable()) {
+		DRM_DEBUG("Insufficient privileges to map OA buffer\n");
+		return -EACCES;
+	}
+
+	switch (vma->vm_pgoff) {
+	/*
+	 * A non-zero offset ensures that we are mapping the right object. Also
+	 * leaves room for future objects added to this implementation.
+	 */
+	case I915_PERF_OA_BUFFER_MMAP_OFFSET:
+		if (!(stream->sample_flags & SAMPLE_OA_REPORT))
+			return -EINVAL;
+
+		if (vma->vm_end - vma->vm_start > OA_BUFFER_SIZE)
+			return -EINVAL;
+
+		/*
+		 * Only support VM_READ. Enforce MAP_PRIVATE by checking for
+		 * VM_MAYSHARE.
+		 */
+		if (vma->vm_flags & (VM_WRITE | VM_EXEC |
+				     VM_SHARED | VM_MAYSHARE))
+			return -EINVAL;
+
+		vma->vm_flags &= ~(VM_MAYWRITE | VM_MAYEXEC);
+
+		/*
+		 * If the privileged parent forks and child drops root
+		 * privilege, we do not want the child to retain access to the
+		 * mapped OA buffer. Explicitly set VM_DONTCOPY to avoid such
+		 * cases.
+		 */
+		vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND |
+				 VM_DONTDUMP | VM_DONTCOPY;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+	vma->vm_private_data = stream;
+	vma->vm_ops = &vm_ops_oa;
+
+	return 0;
+}
 
 static const struct file_operations fops = {
 	.owner		= THIS_MODULE,
@@ -3336,6 +3447,7 @@  static const struct file_operations fops = {
 	 * to handle 32bits compatibility.
 	 */
 	.compat_ioctl   = i915_perf_ioctl,
+	.mmap		= i915_perf_mmap,
 };
 
 
@@ -4480,8 +4592,11 @@  int i915_perf_ioctl_version(void)
 	 *
 	 *    - OA buffer head/tail/status/buffer registers for read only
 	 *    - OA counters A18, A19, A20 for read/write
+	 *
+	 * 8: Added an option to map oa buffer at umd driver level and trigger
+	 *    oa reports within oa buffer from command buffer.
 	 */
-	return 7;
+	return 8;
 }
 
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 00546062e023..36f6b9799ecd 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -2048,6 +2048,22 @@  struct drm_i915_perf_open_param {
  */
 #define I915_PERF_IOCTL_CONFIG	_IO('i', 0x2)
 
+/**
+ * Returns OA buffer properties to be used with mmap.
+ *
+ * This ioctl is available in perf revision 8.
+ */
+#define I915_PERF_IOCTL_GET_OA_BUFFER_INFO _IO('i', 0x3)
+
+/**
+ * OA buffer size and offset.
+ */
+struct drm_i915_perf_oa_buffer_info {
+	__u32 size;
+	__u32 offset;
+	__u64 reserved[4];
+};
+
 /**
  * Common to all i915 perf records
  */