On Thu, Apr 29, 2021 at 8:27 AM Daniel Vetter <daniel@xxxxxxxx> wrote:
>
> On Fri, Apr 23, 2021 at 05:31:24PM -0500, Jason Ekstrand wrote:
> > We're about to start doing lazy context creation which means contexts
> > get created in i915_gem_context_lookup and we may start having more
> > errors than -ENOENT.
> >
> > Signed-off-by: Jason Ekstrand <jason@xxxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/gem/i915_gem_context.c | 12 ++++++------
> > drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c | 4 ++--
> > drivers/gpu/drm/i915/i915_drv.h | 2 +-
> > drivers/gpu/drm/i915/i915_perf.c | 4 ++--
> > 4 files changed, 11 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> > index 3e883daab93bf..7929d5a8be449 100644
> > --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
> > +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> > @@ -2105,8 +2105,8 @@ int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
> > int ret = 0;
> >
> > ctx = i915_gem_context_lookup(file_priv, args->ctx_id);
> > - if (!ctx)
> > - return -ENOENT;
> > + if (IS_ERR(ctx))
> > + return PTR_ERR(ctx);
> >
> > switch (args->param) {
> > case I915_CONTEXT_PARAM_GTT_SIZE:
> > @@ -2174,8 +2174,8 @@ int i915_gem_context_setparam_ioctl(struct drm_device *dev, void *data,
> > int ret;
> >
> > ctx = i915_gem_context_lookup(file_priv, args->ctx_id);
> > - if (!ctx)
> > - return -ENOENT;
> > + if (IS_ERR(ctx))
> > + return PTR_ERR(ctx);
> >
> > ret = ctx_setparam(file_priv, ctx, args);
> >
> > @@ -2194,8 +2194,8 @@ int i915_gem_context_reset_stats_ioctl(struct drm_device *dev,
> > return -EINVAL;
> >
> > ctx = i915_gem_context_lookup(file->driver_priv, args->ctx_id);
> > - if (!ctx)
> > - return -ENOENT;
> > + if (IS_ERR(ctx))
> > + return PTR_ERR(ctx);
> >
> > /*
> > * We opt for unserialised reads here. This may result in tearing
> > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> > index 7024adcd5cf15..de14b26f3b2d5 100644
> > --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> > +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> > @@ -739,8 +739,8 @@ static int eb_select_context(struct i915_execbuffer *eb)
> > struct i915_gem_context *ctx;
> >
> > ctx = i915_gem_context_lookup(eb->file->driver_priv, eb->args->rsvd1);
> > - if (unlikely(!ctx))
> > - return -ENOENT;
> > + if (unlikely(IS_ERR(ctx)))
> > + return PTR_ERR(ctx);
> >
> > eb->gem_context = ctx;
> > if (rcu_access_pointer(ctx->vm))
> > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> > index 8571c5c1509a7..004ed0e59c999 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.h
> > +++ b/drivers/gpu/drm/i915/i915_drv.h
>
> I just realized that I think __i915_gem_context_lookup_rcu doesn't have
> users anymore. Please make sure it's deleted.
I deleted it in "drm/i915: Stop manually RCU banging in reset_stats_ioctl"
> > @@ -1851,7 +1851,7 @@ i915_gem_context_lookup(struct drm_i915_file_private *file_priv, u32 id)
> > ctx = NULL;
> > rcu_read_unlock();
> >
> > - return ctx;
> > + return ctx ? ctx : ERR_PTR(-ENOENT);
> > }
> >
> > /* i915_gem_evict.c */
> > diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
> > index 85ad62dbabfab..b86ed03f6a705 100644
> > --- a/drivers/gpu/drm/i915/i915_perf.c
> > +++ b/drivers/gpu/drm/i915/i915_perf.c
> > @@ -3414,10 +3414,10 @@ i915_perf_open_ioctl_locked(struct i915_perf *perf,
> > struct drm_i915_file_private *file_priv = file->driver_priv;
> >
> > specific_ctx = i915_gem_context_lookup(file_priv, ctx_handle);
> > - if (!specific_ctx) {
> > + if (IS_ERR(specific_ctx)) {
> > DRM_DEBUG("Failed to look up context with ID %u for opening perf stream\n",
> > ctx_handle);
> > - ret = -ENOENT;
> > + ret = PTR_ERR(specific_ctx);
>
> Yeah this looks like a nice place to integrate this.
>
> Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
>
> One thing we need to make sure in the next patch or thereabouts is that
> lookup can only return ENOENT or ENOMEM, but never EINVAL. I'll drop some
> bikesheds on that :-)
I believe that is the case. All -EINVAL should be handled in the
proto-context code.
--Jason
> -Daniel
>
> > goto err;
> > }
> > }
> > --
> > 2.31.1
> >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
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