[Intel-gfx] [PATCH] drm/i915: Add i915 perf infrastructure
Matthew Auld
matthew.william.auld at gmail.com
Fri Oct 7 17:10:35 UTC 2016
On 14 September 2016 at 16:32, Robert Bragg <robert at sixbynine.org> wrote:
> 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, ¶m);
>
> 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.
>
> v4:
> s/DRM_IORW/DRM_IOR/ - Emil Velikov
> v3:
> update read() interface to avoid passing state struct - Chris Wilson
> fix some rebase fallout, with i915-perf init/deinit
> v2:
> use i915_gem_context_get() - Chris Wilson
>
> Signed-off-by: Robert Bragg <robert at sixbynine.org>
> ---
> drivers/gpu/drm/i915/Makefile | 3 +
> drivers/gpu/drm/i915/i915_drv.c | 4 +
> drivers/gpu/drm/i915/i915_drv.h | 91 ++++++++
> drivers/gpu/drm/i915/i915_perf.c | 448 +++++++++++++++++++++++++++++++++++++++
> include/uapi/drm/i915_drm.h | 67 ++++++
> 5 files changed, 613 insertions(+)
> create mode 100644 drivers/gpu/drm/i915/i915_perf.c
>
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index a998c2b..d991781 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -110,6 +110,9 @@ i915-y += dvo_ch7017.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
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 7f4e8ad..14f22fc 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -838,6 +838,8 @@ static int i915_driver_init_early(struct drm_i915_private *dev_priv,
>
> intel_device_info_dump(dev_priv);
>
> + i915_perf_init(dev_priv);
> +
> /* Not all pre-production machines fall into this category, only the
> * very first ones. Almost everything should work, except for maybe
> * suspend/resume. And we don't implement workarounds that affect only
> @@ -859,6 +861,7 @@ err_workqueues:
> */
> 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);
> }
> @@ -2560,6 +2563,7 @@ 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 = {
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 1e2dda8..0f5cd8f 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1740,6 +1740,84 @@ 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;
>
> @@ -2040,6 +2118,12 @@ 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 *);
> @@ -3445,6 +3529,9 @@ 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,
> @@ -3555,6 +3642,10 @@ 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);
> diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
> new file mode 100644
> index 0000000..87530f5
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/i915_perf.c
> @@ -0,0 +1,448 @@
> +/*
> + * 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 at sixbynine.org>
> + */
> +
> +#include <linux/anon_inodes.h>
> +#include <linux/sizes.h>
This should really be introduced in a later patch, but meh.
> +
> +#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;
> +}
> +
> +int i915_perf_open_ioctl_locked(struct drm_device *dev,
> + struct drm_i915_perf_open_param *param,
> + struct perf_open_properties *props,
> + struct drm_file *file)
> +{
This should be static and also let's just make it take dev_priv directly.
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct i915_gem_context *specific_ctx = NULL;
> + struct i915_perf_stream *stream = NULL;
> + unsigned long f_flags = 0;
> + int stream_fd;
> + int ret = 0;
No need to initialize.
> +
> + 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;
> + }
> +
> + 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, (u64 __user *)uprop);
> + if (ret)
> + return ret;
> +
> + if (id == 0 || id >= DRM_I915_PERF_PROP_MAX) {
> + DRM_ERROR("Unknown i915 perf property ID");
> + return -EINVAL;
> + }
> +
> + ret = get_user(value, (u64 __user *)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;
> +
Don't bother with the new line here, it just gets removed later.
> + case DRM_I915_PERF_PROP_MAX:
> + BUG();
We already handle this case above, but I guess we still need this in
order to silence gcc...
> + }
> +
> + 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 = 0;
No need to initialize.
> + 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, 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;
> +}
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index 03725fe..77fe79b 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -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_IOR(DRM_COMMAND_BASE + DRM_I915_PERF_OPEN, struct drm_i915_perf_open_param)
As you already pointed out this will need to be IOW.
>
> /* Allow drivers to submit batchbuffers directly to hardware, relying
> * on the security mechanisms provided by hardware.
> @@ -1222,6 +1224,71 @@ 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
> --
> 2.9.2
>
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