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
>
