From: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
To: Jason Ekstrand <jason@jlekstrand.net>,
intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Subject: Re: [Intel-gfx] [PATCH 12/27] drm/i915/gem: Disallow creating contexts with too many engines
Date: Wed, 5 May 2021 10:56:50 +0100 [thread overview]
Message-ID: <3a4fa1f0-f5e2-3f71-8d69-2908382d82ba@linux.intel.com> (raw)
In-Reply-To: <20210503155748.1961781-13-jason@jlekstrand.net>
On 03/05/2021 16:57, Jason Ekstrand wrote:
> There's no sense in allowing userspace to create more engines than it
> can possibly access via execbuf.
>
> Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
FWIW, again for the record, my advice is not to land this one. It makes
no sense and it is actively disruptive for no benefit.
Regards,
Tvrtko
> ---
> drivers/gpu/drm/i915/gem/i915_gem_context.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> index be42dc918ef6f..8e254d83d65f2 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> @@ -1640,11 +1640,11 @@ set_engines(struct i915_gem_context *ctx,
> return -EINVAL;
> }
>
> - /*
> - * Note that I915_EXEC_RING_MASK limits execbuf to only using the
> - * first 64 engines defined here.
> - */
> num_engines = (args->size - sizeof(*user)) / sizeof(*user->engines);
> + /* RING_MASK has no shift so we can use it directly here */
> + if (num_engines > I915_EXEC_RING_MASK + 1)
> + return -EINVAL;
> +
> set.engines = alloc_engines(num_engines);
> if (!set.engines)
> return -ENOMEM;
>
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next prev parent reply other threads:[~2021-05-05 9:56 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-03 15:57 [PATCH 00/27] drm/i915/gem: ioctl clean-ups (v5) Jason Ekstrand
2021-05-03 15:57 ` [PATCH 01/27] drm/i915: Drop I915_CONTEXT_PARAM_RINGSIZE Jason Ekstrand
2021-05-03 15:57 ` [PATCH 02/27] drm/i915: Stop storing the ring size in the ring pointer Jason Ekstrand
2021-05-04 8:47 ` Daniel Vetter
2021-05-14 18:06 ` Jason Ekstrand
2021-05-03 15:57 ` [PATCH 03/27] drm/i915: Drop I915_CONTEXT_PARAM_NO_ZEROMAP Jason Ekstrand
2021-05-04 8:48 ` [Intel-gfx] " Daniel Vetter
2021-05-03 15:57 ` [PATCH 04/27] drm/i915/gem: Set the watchdog timeout directly in intel_context_set_gem (v2) Jason Ekstrand
2021-05-03 15:57 ` [PATCH 05/27] drm/i915/gem: Return void from context_apply_all Jason Ekstrand
2021-05-03 15:57 ` [PATCH 06/27] drm/i915: Drop the CONTEXT_CLONE API Jason Ekstrand
2021-05-04 8:50 ` [Intel-gfx] " Daniel Vetter
2021-05-14 18:07 ` Jason Ekstrand
2021-05-03 15:57 ` [PATCH 07/27] drm/i915: Implement SINGLE_TIMELINE with a syncobj (v4) Jason Ekstrand
2021-05-03 15:57 ` [PATCH 08/27] drm/i915: Drop getparam support for I915_CONTEXT_PARAM_ENGINES Jason Ekstrand
2021-05-03 15:57 ` [PATCH 09/27] drm/i915/gem: Disallow bonding of virtual engines (v3) Jason Ekstrand
2021-05-03 15:57 ` [PATCH 10/27] drm/i915/gem: Remove engine auto-magic with FENCE_SUBMIT Jason Ekstrand
2021-05-04 8:56 ` Daniel Vetter
2021-05-14 18:19 ` Jason Ekstrand
2021-05-03 15:57 ` [PATCH 11/27] drm/i915/request: Remove the hook from await_execution Jason Ekstrand
2021-05-04 8:55 ` Daniel Vetter
2021-05-03 15:57 ` [PATCH 12/27] drm/i915/gem: Disallow creating contexts with too many engines Jason Ekstrand
2021-05-05 9:56 ` Tvrtko Ursulin [this message]
2021-05-03 15:57 ` [PATCH 13/27] drm/i915: Stop manually RCU banging in reset_stats_ioctl (v2) Jason Ekstrand
2021-05-03 15:57 ` [PATCH 14/27] drm/i915/gem: Add a separate validate_priority helper Jason Ekstrand
2021-05-03 15:57 ` [PATCH 15/27] drm/i915: Add gem/i915_gem_context.h to the docs Jason Ekstrand
2021-05-04 9:11 ` Daniel Vetter
2021-05-03 15:57 ` [PATCH 16/27] drm/i915/gem: Add an intermediate proto_context struct Jason Ekstrand
2021-05-04 16:13 ` Daniel Vetter
2021-06-02 21:53 ` Jason Ekstrand
2021-06-03 7:07 ` Daniel Vetter
2021-05-05 10:09 ` [Intel-gfx] " Tvrtko Ursulin
2021-05-03 15:57 ` [PATCH 17/27] drm/i915/gem: Rework error handling in default_engines Jason Ekstrand
2021-05-04 16:17 ` [Intel-gfx] " Daniel Vetter
2021-05-14 18:21 ` Jason Ekstrand
2021-05-03 15:57 ` [PATCH 18/27] drm/i915/gem: Optionally set SSEU in intel_context_set_gem Jason Ekstrand
2021-05-04 19:00 ` [Intel-gfx] " Daniel Vetter
2021-05-05 9:28 ` Tvrtko Ursulin
2021-05-05 9:47 ` Daniel Vetter
2021-05-05 9:52 ` Tvrtko Ursulin
2021-05-03 15:57 ` [PATCH 19/27] drm/i915/gem: Use the proto-context to handle create parameters Jason Ekstrand
2021-05-04 20:33 ` Daniel Vetter
2021-05-14 19:13 ` Jason Ekstrand
2021-05-17 13:40 ` Daniel Vetter
2021-05-17 17:04 ` Jason Ekstrand
2021-05-17 18:44 ` Daniel Vetter
2021-05-18 10:51 ` Jani Nikula
2021-05-03 15:57 ` [PATCH 20/27] drm/i915/gem: Return an error ptr from context_lookup Jason Ekstrand
2021-05-03 15:57 ` [PATCH 21/27] drm/i915/gt: Drop i915_address_space::file (v2) Jason Ekstrand
2021-05-03 15:57 ` [PATCH 22/27] drm/i915/gem: Delay context creation Jason Ekstrand
2021-05-03 19:38 ` [Intel-gfx] " kernel test robot
2021-05-04 20:53 ` Daniel Vetter
2021-05-04 20:53 ` Daniel Vetter
2021-05-03 15:57 ` [PATCH 23/27] drm/i915/gem: Don't allow changing the VM on running contexts Jason Ekstrand
2021-05-03 18:52 ` [Intel-gfx] " kernel test robot
2021-05-04 21:00 ` Daniel Vetter
2021-05-04 21:17 ` Daniel Vetter
2021-05-03 15:57 ` [PATCH 24/27] drm/i915/gem: Don't allow changing the engine set " Jason Ekstrand
2021-05-05 9:49 ` [Intel-gfx] " Daniel Vetter
2021-05-03 15:57 ` [PATCH 25/27] drm/i915/selftests: Take a VM in kernel_context() Jason Ekstrand
2021-05-05 9:50 ` Daniel Vetter
2021-05-03 15:57 ` [PATCH 26/27] i915/gem/selftests: Assign the VM at context creation in igt_shared_ctx_exec Jason Ekstrand
2021-05-05 9:53 ` [Intel-gfx] " Daniel Vetter
2021-05-03 15:57 ` [PATCH 27/27] drm/i915/gem: Roll all of context creation together Jason Ekstrand
2021-05-05 10:05 ` [Intel-gfx] " Daniel Vetter
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