[Intel-gfx] [CI 8/8] drm/i915: Expose client engine utilisation via fdinfo
Daniel Vetter
daniel at ffwll.ch
Mon Apr 4 15:36:38 UTC 2022
On Mon, Apr 04, 2022 at 10:23:53AM +0100, Tvrtko Ursulin wrote:
>
> + Dave and Daniel
>
> Guys, are you okay with merging this via drm-intel-gt-next? It is one new
> file at Documentation/gpu/drm-usage-stats.rst only which is outside i915. It
> has acks from Christian and Rob.
Acked-by: Daniel Vetter <daniel.vetter at ffwll.ch>
>
> Daniel, series is also fully reviewed and IGT reviewed and ready. Rob also
> demonstrated the approach works for msm when using the vendor agnosstic
> gputop tool I sketched out (see
> 20220225202614.225197-3-robdclark at gmail.com).
>
> My plan is to merge the i915 support with the common spec and intel_gpu_top
> on the IGT side. Then follow-up with vendor agnostic gputop and later yet
> potentially re-visit the AMD side by re-sending the patch which tweaks the
> fdinfo format there and adds support for relative engine utilisation as
> provided by amdgpu.
>
> Regards,
>
> Tvrtko
>
> On 04/04/2022 10:12, Tvrtko Ursulin wrote:
> >
> > On 01/04/2022 15:22, Tvrtko Ursulin wrote:
> > > From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> > >
> > > 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)
> > >
> > > v5:
> > > * Don't output engine data before Gen8.
> > >
> > > Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> > > Cc: David M Nieto <David.Nieto at amd.com>
> > > Cc: Christian König <christian.koenig at amd.com>
> > > Cc: Daniel Vetter <daniel at ffwll.ch>
> > > Cc: Chris Healy <cphealy at gmail.com>
> > > Acked-by: Christian König <christian.koenig at amd.com>
> > > Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>
> >
> > Forgot to apply an earlier:
> >
> > Acked-by: Rob Clark <robdclark at gmail.com>
> >
> > Regards,
> >
> > Tvrtko
> >
> > > ---
> > > 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 | 84 ++++++++++++++++++++++++++
> > > drivers/gpu/drm/i915/i915_drm_client.h | 4 ++
> > > 5 files changed, 125 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 0f08693d05cd..54060cd6c419 100644
> > > --- a/Documentation/gpu/i915.rst
> > > +++ b/Documentation/gpu/i915.rst
> > > @@ -697,3 +697,31 @@ 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 b2df273e6d7b..3ffb617d75c9 100644
> > > --- a/drivers/gpu/drm/i915/i915_driver.c
> > > +++ b/drivers/gpu/drm/i915/i915_driver.c
> > > @@ -1745,6 +1745,9 @@ 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..e539f6b23060 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 +74,81 @@ 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);
> > > +
> > > + if (GRAPHICS_VER(i915) < 8)
> > > + return;
> > > +
> > > + 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__ */
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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