Re: [PATCH 8/8] drm/i915: Expose client engine utilisation via fdinfo

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On Tue, Feb 22, 2022 at 6:05 AM Tvrtko Ursulin
<tvrtko.ursulin@xxxxxxxxxxxxxxx> wrote:
>
> From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
>
> Similar to AMD commit
> 874442541133 ("drm/amdgpu: Add show_fdinfo() interface"), using the
> infrastructure added in previous patches, we add basic client info
> and GPU engine utilisation for i915.
>
> Example of the output:
>
>   pos:    0
>   flags:  0100002
>   mnt_id: 21
>   drm-driver: i915
>   drm-pdev:   0000:00:02.0
>   drm-client-id:      7
>   drm-engine-render:  9288864723 ns
>   drm-engine-copy:    2035071108 ns
>   drm-engine-video:   0 ns
>   drm-engine-video-enhance:   0 ns
>
> v2:
>  * Update for removal of name and pid.
>
> v3:
>  * Use drm_driver.name.
>
> v4:
>  * Added drm-engine-capacity- tag.
>  * Fix typo. (Umesh)
>
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> Cc: David M Nieto <David.Nieto@xxxxxxx>
> Cc: Christian König <christian.koenig@xxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Cc: Chris Healy <cphealy@xxxxxxxxx>
> Acked-by: Christian König <christian.koenig@xxxxxxx>
> Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@xxxxxxxxx> # v3

Acked-by: Rob Clark <robdclark@xxxxxxxxx>

> ---
>  Documentation/gpu/drm-usage-stats.rst  |  6 ++
>  Documentation/gpu/i915.rst             | 28 +++++++++
>  drivers/gpu/drm/i915/i915_driver.c     |  3 +
>  drivers/gpu/drm/i915/i915_drm_client.c | 81 ++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/i915_drm_client.h |  4 ++
>  5 files changed, 122 insertions(+)
>
> diff --git a/Documentation/gpu/drm-usage-stats.rst b/Documentation/gpu/drm-usage-stats.rst
> index b8cc28f4da6f..6c9f166a8d6f 100644
> --- a/Documentation/gpu/drm-usage-stats.rst
> +++ b/Documentation/gpu/drm-usage-stats.rst
> @@ -104,3 +104,9 @@ object belong to this client, in the respective memory region.
>
>  Default unit shall be bytes with optional unit specifiers of 'KiB' or 'MiB'
>  indicating kibi- or mebi-bytes.
> +
> +===============================
> +Driver specific implementations
> +===============================
> +
> +:ref:`i915-usage-stats`
> diff --git a/Documentation/gpu/i915.rst b/Documentation/gpu/i915.rst
> index bcaefc952764..cfc64f5795a4 100644
> --- a/Documentation/gpu/i915.rst
> +++ b/Documentation/gpu/i915.rst
> @@ -709,3 +709,31 @@ The style guide for ``i915_reg.h``.
>
>  .. kernel-doc:: drivers/gpu/drm/i915/i915_reg.h
>     :doc: The i915 register macro definition style guide
> +
> +.. _i915-usage-stats:
> +
> +i915 DRM client usage stats implementation
> +==========================================
> +
> +The drm/i915 driver implements the DRM client usage stats specification as
> +documented in :ref:`drm-client-usage-stats`.
> +
> +Example of the output showing the implemented key value pairs and entirety of
> +the currently possible format options:
> +
> +::
> +
> +      pos:    0
> +      flags:  0100002
> +      mnt_id: 21
> +      drm-driver: i915
> +      drm-pdev:   0000:00:02.0
> +      drm-client-id:      7
> +      drm-engine-render:  9288864723 ns
> +      drm-engine-copy:    2035071108 ns
> +      drm-engine-video:   0 ns
> +      drm-engine-capacity-video:   2
> +      drm-engine-video-enhance:   0 ns
> +
> +Possible `drm-engine-` key names are: `render`, `copy`, `video` and
> +`video-enhance`.
> diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
> index 4bf6715c5c3a..fe33e79cef8b 100644
> --- a/drivers/gpu/drm/i915/i915_driver.c
> +++ b/drivers/gpu/drm/i915/i915_driver.c
> @@ -1746,6 +1746,9 @@ static const struct file_operations i915_driver_fops = {
>         .read = drm_read,
>         .compat_ioctl = i915_ioc32_compat_ioctl,
>         .llseek = noop_llseek,
> +#ifdef CONFIG_PROC_FS
> +       .show_fdinfo = i915_drm_client_fdinfo,
> +#endif
>  };
>
>  static int
> diff --git a/drivers/gpu/drm/i915/i915_drm_client.c b/drivers/gpu/drm/i915/i915_drm_client.c
> index 91a8559bebf7..54b40f451959 100644
> --- a/drivers/gpu/drm/i915/i915_drm_client.c
> +++ b/drivers/gpu/drm/i915/i915_drm_client.c
> @@ -7,7 +7,13 @@
>  #include <linux/slab.h>
>  #include <linux/types.h>
>
> +#include <uapi/drm/i915_drm.h>
> +
> +#include <drm/drm_print.h>
> +
> +#include "gem/i915_gem_context.h"
>  #include "i915_drm_client.h"
> +#include "i915_file_private.h"
>  #include "i915_gem.h"
>  #include "i915_utils.h"
>
> @@ -68,3 +74,78 @@ void i915_drm_clients_fini(struct i915_drm_clients *clients)
>         GEM_BUG_ON(!xa_empty(&clients->xarray));
>         xa_destroy(&clients->xarray);
>  }
> +
> +#ifdef CONFIG_PROC_FS
> +static const char * const uabi_class_names[] = {
> +       [I915_ENGINE_CLASS_RENDER] = "render",
> +       [I915_ENGINE_CLASS_COPY] = "copy",
> +       [I915_ENGINE_CLASS_VIDEO] = "video",
> +       [I915_ENGINE_CLASS_VIDEO_ENHANCE] = "video-enhance",
> +};
> +
> +static u64 busy_add(struct i915_gem_context *ctx, unsigned int class)
> +{
> +       struct i915_gem_engines_iter it;
> +       struct intel_context *ce;
> +       u64 total = 0;
> +
> +       for_each_gem_engine(ce, rcu_dereference(ctx->engines), it) {
> +               if (ce->engine->uabi_class != class)
> +                       continue;
> +
> +               total += intel_context_get_total_runtime_ns(ce);
> +       }
> +
> +       return total;
> +}
> +
> +static void
> +show_client_class(struct seq_file *m,
> +                 struct i915_drm_client *client,
> +                 unsigned int class)
> +{
> +       const struct list_head *list = &client->ctx_list;
> +       u64 total = atomic64_read(&client->past_runtime[class]);
> +       const unsigned int capacity =
> +               client->clients->i915->engine_uabi_class_count[class];
> +       struct i915_gem_context *ctx;
> +
> +       rcu_read_lock();
> +       list_for_each_entry_rcu(ctx, list, client_link)
> +               total += busy_add(ctx, class);
> +       rcu_read_unlock();
> +
> +       seq_printf(m, "drm-engine-%s:\t%llu ns\n",
> +                  uabi_class_names[class], total);
> +
> +       if (capacity > 1)
> +               seq_printf(m, "drm-engine-capacity-%s:\t%u\n",
> +                          uabi_class_names[class],
> +                          capacity);
> +}
> +
> +void i915_drm_client_fdinfo(struct seq_file *m, struct file *f)
> +{
> +       struct drm_file *file = f->private_data;
> +       struct drm_i915_file_private *file_priv = file->driver_priv;
> +       struct drm_i915_private *i915 = file_priv->dev_priv;
> +       struct i915_drm_client *client = file_priv->client;
> +       struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
> +       unsigned int i;
> +
> +       /*
> +        * ******************************************************************
> +        * For text output format description please see drm-usage-stats.rst!
> +        * ******************************************************************
> +        */
> +
> +       seq_printf(m, "drm-driver:\t%s\n", i915->drm.driver->name);
> +       seq_printf(m, "drm-pdev:\t%04x:%02x:%02x.%d\n",
> +                  pci_domain_nr(pdev->bus), pdev->bus->number,
> +                  PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
> +       seq_printf(m, "drm-client-id:\t%u\n", client->id);
> +
> +       for (i = 0; i < ARRAY_SIZE(uabi_class_names); i++)
> +               show_client_class(m, client, i);
> +}
> +#endif
> diff --git a/drivers/gpu/drm/i915/i915_drm_client.h b/drivers/gpu/drm/i915/i915_drm_client.h
> index 191368386ace..5f5b02b01ba0 100644
> --- a/drivers/gpu/drm/i915/i915_drm_client.h
> +++ b/drivers/gpu/drm/i915/i915_drm_client.h
> @@ -59,6 +59,10 @@ static inline void i915_drm_client_put(struct i915_drm_client *client)
>
>  struct i915_drm_client *i915_drm_client_add(struct i915_drm_clients *clients);
>
> +#ifdef CONFIG_PROC_FS
> +void i915_drm_client_fdinfo(struct seq_file *m, struct file *f);
> +#endif
> +
>  void i915_drm_clients_fini(struct i915_drm_clients *clients);
>
>  #endif /* !__I915_DRM_CLIENT_H__ */
> --
> 2.32.0
>




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