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drm/i915: Add i915 perf infrastructure

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Adds base i915 perf infrastructure for Gen performance metrics.

This adds a DRM_IOCTL_I915_PERF_OPEN ioctl that takes an array of uint64
properties to configure a stream of metrics and returns a new fd usable
with standard VFS system calls including read() to read typed and sized
records; ioctl() to enable or disable capture and poll() to wait for
data.

A stream is opened something like:

  uint64_t properties[] = {
      /* Single context sampling */
      DRM_I915_PERF_PROP_CTX_HANDLE,        ctx_handle,

      /* Include OA reports in samples */
      DRM_I915_PERF_PROP_SAMPLE_OA,         true,

      /* OA unit configuration */
      DRM_I915_PERF_PROP_OA_METRICS_SET,    metrics_set_id,
      DRM_I915_PERF_PROP_OA_FORMAT,         report_format,
      DRM_I915_PERF_PROP_OA_EXPONENT,       period_exponent,
   };
   struct drm_i915_perf_open_param parm = {
      .flags = I915_PERF_FLAG_FD_CLOEXEC |
               I915_PERF_FLAG_FD_NONBLOCK |
               I915_PERF_FLAG_DISABLED,
      .properties_ptr = (uint64_t)properties,
      .num_properties = sizeof(properties) / 16,
   };
   int fd = drmIoctl(drm_fd, DRM_IOCTL_I915_PERF_OPEN, &param);

Records read all start with a common { type, size } header with
DRM_I915_PERF_RECORD_SAMPLE being of most interest. Sample records
contain an extensible number of fields and it's the
DRM_I915_PERF_PROP_SAMPLE_xyz properties given when opening that
determine what's included in every sample.

No specific streams are supported yet so any attempt to open a stream
will return an error.

v2:
    use i915_gem_context_get() - Chris Wilson
v3:
    update read() interface to avoid passing state struct - Chris Wilson
    fix some rebase fallout, with i915-perf init/deinit
v4:
    s/DRM_IORW/DRM_IOW/ - Emil Velikov

Signed-off-by: Robert Bragg <robert@sixbynine.org>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Sourab Gupta <sourab.gupta@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161107194957.3385-2-robert@sixbynine.org
This commit is contained in:
Robert Bragg 2016-11-07 19:49:47 +00:00 committed by Daniel Vetter
parent bc1d53c647
commit eec688e142
5 changed files with 614 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
drivers/gpu/drm/i915/Makefile
View file

@ -117,6 +117,9 @@ i915-$(CONFIG_DRM_I915_CAPTURE_ERROR) += i915_gpu_error.o
# virtual gpu code
i915-y += i915_vgpu.o
# perf code
i915-y += i915_perf.o
ifeq ($(CONFIG_DRM_I915_GVT),y)
i915-y += intel_gvt.o
include $(src)/gvt/Makefile

4
drivers/gpu/drm/i915/i915_drv.c
View file

@ -848,6 +848,8 @@ static int i915_driver_init_early(struct drm_i915_private *dev_priv,
intel_detect_preproduction_hw(dev_priv);
i915_perf_init(dev_priv);
return 0;
err_gvt:
@ -863,6 +865,7 @@ static int i915_driver_init_early(struct drm_i915_private *dev_priv,
*/
static void i915_driver_cleanup_early(struct drm_i915_private *dev_priv)
{
i915_perf_fini(dev_priv);
i915_gem_load_cleanup(&dev_priv->drm);
i915_workqueues_cleanup(dev_priv);
}
@ -2565,6 +2568,7 @@ static const struct drm_ioctl_desc i915_ioctls[] = {
DRM_IOCTL_DEF_DRV(I915_GEM_USERPTR, i915_gem_userptr_ioctl, DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_GETPARAM, i915_gem_context_getparam_ioctl, DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_SETPARAM, i915_gem_context_setparam_ioctl, DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(I915_PERF_OPEN, i915_perf_open_ioctl, DRM_RENDER_ALLOW),
};
static struct drm_driver driver = {

91
drivers/gpu/drm/i915/i915_drv.h
View file

@ -1797,6 +1797,84 @@ struct intel_wm_config {
bool sprites_scaled;
};
struct i915_perf_stream;
struct i915_perf_stream_ops {
/* Enables the collection of HW samples, either in response to
* I915_PERF_IOCTL_ENABLE or implicitly called when stream is
* opened without I915_PERF_FLAG_DISABLED.
*/
void (*enable)(struct i915_perf_stream *stream);
/* Disables the collection of HW samples, either in response to
* I915_PERF_IOCTL_DISABLE or implicitly called before
* destroying the stream.
*/
void (*disable)(struct i915_perf_stream *stream);
/* Return: true if any i915 perf records are ready to read()
* for this stream.
*/
bool (*can_read)(struct i915_perf_stream *stream);
/* Call poll_wait, passing a wait queue that will be woken
* once there is something ready to read() for the stream
*/
void (*poll_wait)(struct i915_perf_stream *stream,
struct file *file,
poll_table *wait);
/* For handling a blocking read, wait until there is something
* to ready to read() for the stream. E.g. wait on the same
* wait queue that would be passed to poll_wait() until
* ->can_read() returns true (if its safe to call ->can_read()
* without the i915 perf lock held).
*/
int (*wait_unlocked)(struct i915_perf_stream *stream);
/* read - Copy buffered metrics as records to userspace
* @buf: the userspace, destination buffer
* @count: the number of bytes to copy, requested by userspace
* @offset: zero at the start of the read, updated as the read
* proceeds, it represents how many bytes have been
* copied so far and the buffer offset for copying the
* next record.
*
* Copy as many buffered i915 perf samples and records for
* this stream to userspace as will fit in the given buffer.
*
* Only write complete records; returning -ENOSPC if there
* isn't room for a complete record.
*
* Return any error condition that results in a short read
* such as -ENOSPC or -EFAULT, even though these may be
* squashed before returning to userspace.
*/
int (*read)(struct i915_perf_stream *stream,
char __user *buf,
size_t count,
size_t *offset);
/* Cleanup any stream specific resources.
*
* The stream will always be disabled before this is called.
*/
void (*destroy)(struct i915_perf_stream *stream);
};
struct i915_perf_stream {
struct drm_i915_private *dev_priv;
struct list_head link;
u32 sample_flags;
struct i915_gem_context *ctx;
bool enabled;
struct i915_perf_stream_ops *ops;
};
struct drm_i915_private {
struct drm_device drm;
@ -2092,6 +2170,12 @@ struct drm_i915_private {
struct i915_runtime_pm pm;
struct {
bool initialized;
struct mutex lock;
struct list_head streams;
} perf;
/* Abstract the submission mechanism (legacy ringbuffer or execlists) away */
struct {
void (*resume)(struct drm_i915_private *);
@ -3253,6 +3337,9 @@ int i915_gem_context_setparam_ioctl(struct drm_device *dev, void *data,
int i915_gem_context_reset_stats_ioctl(struct drm_device *dev, void *data,
struct drm_file *file);
int i915_perf_open_ioctl(struct drm_device *dev, void *data,
struct drm_file *file);
/* i915_gem_evict.c */
int __must_check i915_gem_evict_something(struct i915_address_space *vm,
u64 min_size, u64 alignment,
@ -3383,6 +3470,10 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine,
u32 batch_len,
bool is_master);
/* i915_perf.c */
extern void i915_perf_init(struct drm_i915_private *dev_priv);
extern void i915_perf_fini(struct drm_i915_private *dev_priv);
/* i915_suspend.c */
extern int i915_save_state(struct drm_device *dev);
extern int i915_restore_state(struct drm_device *dev);

449
drivers/gpu/drm/i915/i915_perf.c Normal file
View file

@ -0,0 +1,449 @@
/*
* Copyright © 2015-2016 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Robert Bragg <robert@sixbynine.org>
*/
#include <linux/anon_inodes.h>
#include "i915_drv.h"
struct perf_open_properties {
u32 sample_flags;
u64 single_context:1;
u64 ctx_handle;
};
static ssize_t i915_perf_read_locked(struct i915_perf_stream *stream,
struct file *file,
char __user *buf,
size_t count,
loff_t *ppos)
{
/* Note we keep the offset (aka bytes read) separate from any
* error status so that the final check for whether we return
* the bytes read with a higher precedence than any error (see
* comment below) doesn't need to be handled/duplicated in
* stream->ops->read() implementations.
*/
size_t offset = 0;
int ret = stream->ops->read(stream, buf, count, &offset);
/* If we've successfully copied any data then reporting that
* takes precedence over any internal error status, so the
* data isn't lost.
*
* For example ret will be -ENOSPC whenever there is more
* buffered data than can be copied to userspace, but that's
* only interesting if we weren't able to copy some data
* because it implies the userspace buffer is too small to
* receive a single record (and we never split records).
*
* Another case with ret == -EFAULT is more of a grey area
* since it would seem like bad form for userspace to ask us
* to overrun its buffer, but the user knows best:
*
* http://yarchive.net/comp/linux/partial_reads_writes.html
*/
return offset ?: (ret ?: -EAGAIN);
}
static ssize_t i915_perf_read(struct file *file,
char __user *buf,
size_t count,
loff_t *ppos)
{
struct i915_perf_stream *stream = file->private_data;
struct drm_i915_private *dev_priv = stream->dev_priv;
ssize_t ret;
if (!(file->f_flags & O_NONBLOCK)) {
/* Allow false positives from stream->ops->wait_unlocked.
*/
do {
ret = stream->ops->wait_unlocked(stream);
if (ret)
return ret;
mutex_lock(&dev_priv->perf.lock);
ret = i915_perf_read_locked(stream, file,
buf, count, ppos);
mutex_unlock(&dev_priv->perf.lock);
} while (ret == -EAGAIN);
} else {
mutex_lock(&dev_priv->perf.lock);
ret = i915_perf_read_locked(stream, file, buf, count, ppos);
mutex_unlock(&dev_priv->perf.lock);
}
return ret;
}
static unsigned int i915_perf_poll_locked(struct i915_perf_stream *stream,
struct file *file,
poll_table *wait)
{
unsigned int streams = 0;
stream->ops->poll_wait(stream, file, wait);
if (stream->ops->can_read(stream))
streams |= POLLIN;
return streams;
}
static unsigned int i915_perf_poll(struct file *file, poll_table *wait)
{
struct i915_perf_stream *stream = file->private_data;
struct drm_i915_private *dev_priv = stream->dev_priv;
int ret;
mutex_lock(&dev_priv->perf.lock);
ret = i915_perf_poll_locked(stream, file, wait);
mutex_unlock(&dev_priv->perf.lock);
return ret;
}
static void i915_perf_enable_locked(struct i915_perf_stream *stream)
{
if (stream->enabled)
return;
/* Allow stream->ops->enable() to refer to this */
stream->enabled = true;
if (stream->ops->enable)
stream->ops->enable(stream);
}
static void i915_perf_disable_locked(struct i915_perf_stream *stream)
{
if (!stream->enabled)
return;
/* Allow stream->ops->disable() to refer to this */
stream->enabled = false;
if (stream->ops->disable)
stream->ops->disable(stream);
}
static long i915_perf_ioctl_locked(struct i915_perf_stream *stream,
unsigned int cmd,
unsigned long arg)
{
switch (cmd) {
case I915_PERF_IOCTL_ENABLE:
i915_perf_enable_locked(stream);
return 0;
case I915_PERF_IOCTL_DISABLE:
i915_perf_disable_locked(stream);
return 0;
}
return -EINVAL;
}
static long i915_perf_ioctl(struct file *file,
unsigned int cmd,
unsigned long arg)
{
struct i915_perf_stream *stream = file->private_data;
struct drm_i915_private *dev_priv = stream->dev_priv;
long ret;
mutex_lock(&dev_priv->perf.lock);
ret = i915_perf_ioctl_locked(stream, cmd, arg);
mutex_unlock(&dev_priv->perf.lock);
return ret;
}
static void i915_perf_destroy_locked(struct i915_perf_stream *stream)
{
struct drm_i915_private *dev_priv = stream->dev_priv;
if (stream->enabled)
i915_perf_disable_locked(stream);
if (stream->ops->destroy)
stream->ops->destroy(stream);
list_del(&stream->link);
if (stream->ctx) {
mutex_lock(&dev_priv->drm.struct_mutex);
i915_gem_context_put(stream->ctx);
mutex_unlock(&dev_priv->drm.struct_mutex);
}
kfree(stream);
}
static int i915_perf_release(struct inode *inode, struct file *file)
{
struct i915_perf_stream *stream = file->private_data;
struct drm_i915_private *dev_priv = stream->dev_priv;
mutex_lock(&dev_priv->perf.lock);
i915_perf_destroy_locked(stream);
mutex_unlock(&dev_priv->perf.lock);
return 0;
}
static const struct file_operations fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.release = i915_perf_release,
.poll = i915_perf_poll,
.read = i915_perf_read,
.unlocked_ioctl = i915_perf_ioctl,
};
static struct i915_gem_context *
lookup_context(struct drm_i915_private *dev_priv,
struct drm_i915_file_private *file_priv,
u32 ctx_user_handle)
{
struct i915_gem_context *ctx;
int ret;
ret = i915_mutex_lock_interruptible(&dev_priv->drm);
if (ret)
return ERR_PTR(ret);
ctx = i915_gem_context_lookup(file_priv, ctx_user_handle);
if (!IS_ERR(ctx))
i915_gem_context_get(ctx);
mutex_unlock(&dev_priv->drm.struct_mutex);
return ctx;
}
static int
i915_perf_open_ioctl_locked(struct drm_i915_private *dev_priv,
struct drm_i915_perf_open_param *param,
struct perf_open_properties *props,
struct drm_file *file)
{
struct i915_gem_context *specific_ctx = NULL;
struct i915_perf_stream *stream = NULL;
unsigned long f_flags = 0;
int stream_fd;
int ret;
if (props->single_context) {
u32 ctx_handle = props->ctx_handle;
struct drm_i915_file_private *file_priv = file->driver_priv;
specific_ctx = lookup_context(dev_priv, file_priv, ctx_handle);
if (IS_ERR(specific_ctx)) {
ret = PTR_ERR(specific_ctx);
if (ret != -EINTR)
DRM_ERROR("Failed to look up context with ID %u for opening perf stream\n",
ctx_handle);
goto err;
}
}
if (!specific_ctx && !capable(CAP_SYS_ADMIN)) {
DRM_ERROR("Insufficient privileges to open system-wide i915 perf stream\n");
ret = -EACCES;
goto err_ctx;
}
stream = kzalloc(sizeof(*stream), GFP_KERNEL);
if (!stream) {
ret = -ENOMEM;
goto err_ctx;
}
stream->sample_flags = props->sample_flags;
stream->dev_priv = dev_priv;
stream->ctx = specific_ctx;
/*
* TODO: support sampling something
*
* For now this is as far as we can go.
*/
DRM_ERROR("Unsupported i915 perf stream configuration\n");
ret = -EINVAL;
goto err_alloc;
list_add(&stream->link, &dev_priv->perf.streams);
if (param->flags & I915_PERF_FLAG_FD_CLOEXEC)
f_flags |= O_CLOEXEC;
if (param->flags & I915_PERF_FLAG_FD_NONBLOCK)
f_flags |= O_NONBLOCK;
stream_fd = anon_inode_getfd("[i915_perf]", &fops, stream, f_flags);
if (stream_fd < 0) {
ret = stream_fd;
goto err_open;
}
if (!(param->flags & I915_PERF_FLAG_DISABLED))
i915_perf_enable_locked(stream);
return stream_fd;
err_open:
list_del(&stream->link);
if (stream->ops->destroy)
stream->ops->destroy(stream);
err_alloc:
kfree(stream);
err_ctx:
if (specific_ctx) {
mutex_lock(&dev_priv->drm.struct_mutex);
i915_gem_context_put(specific_ctx);
mutex_unlock(&dev_priv->drm.struct_mutex);
}
err:
return ret;
}
/* Note we copy the properties from userspace outside of the i915 perf
* mutex to avoid an awkward lockdep with mmap_sem.
*
* Note this function only validates properties in isolation it doesn't
* validate that the combination of properties makes sense or that all
* properties necessary for a particular kind of stream have been set.
*/
static int read_properties_unlocked(struct drm_i915_private *dev_priv,
u64 __user *uprops,
u32 n_props,
struct perf_open_properties *props)
{
u64 __user *uprop = uprops;
int i;
memset(props, 0, sizeof(struct perf_open_properties));
if (!n_props) {
DRM_ERROR("No i915 perf properties given");
return -EINVAL;
}
/* Considering that ID = 0 is reserved and assuming that we don't
* (currently) expect any configurations to ever specify duplicate
* values for a particular property ID then the last _PROP_MAX value is
* one greater than the maximum number of properties we expect to get
* from userspace.
*/
if (n_props >= DRM_I915_PERF_PROP_MAX) {
DRM_ERROR("More i915 perf properties specified than exist");
return -EINVAL;
}
for (i = 0; i < n_props; i++) {
u64 id, value;
int ret;
ret = get_user(id, uprop);
if (ret)
return ret;
ret = get_user(value, uprop + 1);
if (ret)
return ret;
switch ((enum drm_i915_perf_property_id)id) {
case DRM_I915_PERF_PROP_CTX_HANDLE:
props->single_context = 1;
props->ctx_handle = value;
break;
default:
MISSING_CASE(id);
DRM_ERROR("Unknown i915 perf property ID");
return -EINVAL;
}
uprop += 2;
}
return 0;
}
int i915_perf_open_ioctl(struct drm_device *dev, void *data,
struct drm_file *file)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_i915_perf_open_param *param = data;
struct perf_open_properties props;
u32 known_open_flags;
int ret;
if (!dev_priv->perf.initialized) {
DRM_ERROR("i915 perf interface not available for this system");
return -ENOTSUPP;
}
known_open_flags = I915_PERF_FLAG_FD_CLOEXEC |
I915_PERF_FLAG_FD_NONBLOCK |
I915_PERF_FLAG_DISABLED;
if (param->flags & ~known_open_flags) {
DRM_ERROR("Unknown drm_i915_perf_open_param flag\n");
return -EINVAL;
}
ret = read_properties_unlocked(dev_priv,
u64_to_user_ptr(param->properties_ptr),
param->num_properties,
&props);
if (ret)
return ret;
mutex_lock(&dev_priv->perf.lock);
ret = i915_perf_open_ioctl_locked(dev_priv, param, &props, file);
mutex_unlock(&dev_priv->perf.lock);
return ret;
}
void i915_perf_init(struct drm_i915_private *dev_priv)
{
INIT_LIST_HEAD(&dev_priv->perf.streams);
mutex_init(&dev_priv->perf.lock);
dev_priv->perf.initialized = true;
}
void i915_perf_fini(struct drm_i915_private *dev_priv)
{
if (!dev_priv->perf.initialized)
return;
/* Currently nothing to clean up */
dev_priv->perf.initialized = false;
}

67
include/uapi/drm/i915_drm.h
View file

@ -258,6 +258,7 @@ typedef struct _drm_i915_sarea {
#define DRM_I915_GEM_USERPTR 0x33
#define DRM_I915_GEM_CONTEXT_GETPARAM 0x34
#define DRM_I915_GEM_CONTEXT_SETPARAM 0x35
#define DRM_I915_PERF_OPEN 0x36
#define DRM_IOCTL_I915_INIT DRM_IOW( DRM_COMMAND_BASE + DRM_I915_INIT, drm_i915_init_t)
#define DRM_IOCTL_I915_FLUSH DRM_IO ( DRM_COMMAND_BASE + DRM_I915_FLUSH)
@ -311,6 +312,7 @@ typedef struct _drm_i915_sarea {
#define DRM_IOCTL_I915_GEM_USERPTR DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_USERPTR, struct drm_i915_gem_userptr)
#define DRM_IOCTL_I915_GEM_CONTEXT_GETPARAM DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_CONTEXT_GETPARAM, struct drm_i915_gem_context_param)
#define DRM_IOCTL_I915_GEM_CONTEXT_SETPARAM DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_CONTEXT_SETPARAM, struct drm_i915_gem_context_param)
#define DRM_IOCTL_I915_PERF_OPEN DRM_IOW(DRM_COMMAND_BASE + DRM_I915_PERF_OPEN, struct drm_i915_perf_open_param)
/* Allow drivers to submit batchbuffers directly to hardware, relying
* on the security mechanisms provided by hardware.
@ -1228,6 +1230,71 @@ struct drm_i915_gem_context_param {
__u64 value;
};
enum drm_i915_perf_property_id {
/**
* Open the stream for a specific context handle (as used with
* execbuffer2). A stream opened for a specific context this way
* won't typically require root privileges.
*/
DRM_I915_PERF_PROP_CTX_HANDLE = 1,
DRM_I915_PERF_PROP_MAX /* non-ABI */
};
struct drm_i915_perf_open_param {
__u32 flags;
#define I915_PERF_FLAG_FD_CLOEXEC (1<<0)
#define I915_PERF_FLAG_FD_NONBLOCK (1<<1)
#define I915_PERF_FLAG_DISABLED (1<<2)
/** The number of u64 (id, value) pairs */
__u32 num_properties;
/**
* Pointer to array of u64 (id, value) pairs configuring the stream
* to open.
*/
__u64 __user properties_ptr;
};
#define I915_PERF_IOCTL_ENABLE _IO('i', 0x0)
#define I915_PERF_IOCTL_DISABLE _IO('i', 0x1)
/**
* Common to all i915 perf records
*/
struct drm_i915_perf_record_header {
__u32 type;
__u16 pad;
__u16 size;
};
enum drm_i915_perf_record_type {
/**
* Samples are the work horse record type whose contents are extensible
* and defined when opening an i915 perf stream based on the given
* properties.
*
* Boolean properties following the naming convention
* DRM_I915_PERF_SAMPLE_xyz_PROP request the inclusion of 'xyz' data in
* every sample.
*
* The order of these sample properties given by userspace has no
* affect on the ordering of data within a sample. The order will be
* documented here.
*
* struct {
* struct drm_i915_perf_record_header header;
*
* TODO: itemize extensible sample data here
* };
*/
DRM_I915_PERF_RECORD_SAMPLE = 1,
DRM_I915_PERF_RECORD_MAX /* non-ABI */
};
#if defined(__cplusplus)
}
#endif