| Message ID | 20230802221047.9944-1-robdclark@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [RFC] drm/msm: Disallow relocs on a6xx+ | expand |
On Wed, Aug 02, 2023 at 03:10:44PM -0700, Rob Clark wrote: > From: Rob Clark <robdclark@chromium.org> > > Mesa stopped using these pretty early in a6xx bringup. Take advantage > of this to disallow some legacy UABI. > > Signed-off-by: Rob Clark <robdclark@chromium.org> > --- > So, it was late 2018 when mesa stopped using relocs. At that point a6xx > support was still in a pretty early state. I guess you _could_ use such > an old version of mesa with a6xx hw.. but you really shouldn't. Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Might be good to cite the mesa commit that removed the a6xx reloc code in the commit message. -Sima > > drivers/gpu/drm/msm/adreno/adreno_gpu.c | 2 ++ > drivers/gpu/drm/msm/msm_gem_submit.c | 10 ++++++++++ > drivers/gpu/drm/msm/msm_gpu.h | 9 +++++++++ > 3 files changed, 21 insertions(+) > > diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c > index ba35c2a87021..695cce82d914 100644 > --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c > +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c > @@ -1078,6 +1078,8 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev, > adreno_gpu->info = config->info; > adreno_gpu->chip_id = config->chip_id; > > + gpu->allow_relocs = config->info->family < ADRENO_6XX_GEN1; > + > /* Only handle the core clock when GMU is not in use (or is absent). */ > if (adreno_has_gmu_wrapper(adreno_gpu) || > adreno_gpu->info->family < ADRENO_6XX_GEN1) { > diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c > index 63c96416e183..3b908f9f5493 100644 > --- a/drivers/gpu/drm/msm/msm_gem_submit.c > +++ b/drivers/gpu/drm/msm/msm_gem_submit.c > @@ -882,6 +882,16 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data, > if (submit->valid) > continue; > > + if (!gpu->allow_relocs) { > + if (submit->cmd[i].nr_relocs) { > + DRM_ERROR("relocs not allowed\n"); > + ret = -EINVAL; > + goto out; > + } > + > + continue; > + } > + > ret = submit_reloc(submit, msm_obj, submit->cmd[i].offset * 4, > submit->cmd[i].nr_relocs, submit->cmd[i].relocs); > if (ret) > diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h > index 7a4fa1b8655b..4252e3839fbc 100644 > --- a/drivers/gpu/drm/msm/msm_gpu.h > +++ b/drivers/gpu/drm/msm/msm_gpu.h > @@ -285,6 +285,15 @@ struct msm_gpu { > /* True if the hardware supports expanded apriv (a650 and newer) */ > bool hw_apriv; > > + /** > + * @allow_relocs: allow relocs in SUBMIT ioctl > + * > + * Mesa won't use relocs for driver version 1.4.0 and later. This > + * switch-over happened early enough in mesa a6xx bringup that we > + * can disallow relocs for a6xx and newer. > + */ > + bool allow_relocs; > + > struct thermal_cooling_device *cooling; > }; > > -- > 2.41.0 >
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c index ba35c2a87021..695cce82d914 100644 --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c @@ -1078,6 +1078,8 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev, adreno_gpu->info = config->info; adreno_gpu->chip_id = config->chip_id; + gpu->allow_relocs = config->info->family < ADRENO_6XX_GEN1; + /* Only handle the core clock when GMU is not in use (or is absent). */ if (adreno_has_gmu_wrapper(adreno_gpu) || adreno_gpu->info->family < ADRENO_6XX_GEN1) { diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c index 63c96416e183..3b908f9f5493 100644 --- a/drivers/gpu/drm/msm/msm_gem_submit.c +++ b/drivers/gpu/drm/msm/msm_gem_submit.c @@ -882,6 +882,16 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data, if (submit->valid) continue; + if (!gpu->allow_relocs) { + if (submit->cmd[i].nr_relocs) { + DRM_ERROR("relocs not allowed\n"); + ret = -EINVAL; + goto out; + } + + continue; + } + ret = submit_reloc(submit, msm_obj, submit->cmd[i].offset * 4, submit->cmd[i].nr_relocs, submit->cmd[i].relocs); if (ret) diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h index 7a4fa1b8655b..4252e3839fbc 100644 --- a/drivers/gpu/drm/msm/msm_gpu.h +++ b/drivers/gpu/drm/msm/msm_gpu.h @@ -285,6 +285,15 @@ struct msm_gpu { /* True if the hardware supports expanded apriv (a650 and newer) */ bool hw_apriv; + /** + * @allow_relocs: allow relocs in SUBMIT ioctl + * + * Mesa won't use relocs for driver version 1.4.0 and later. This + * switch-over happened early enough in mesa a6xx bringup that we + * can disallow relocs for a6xx and newer. + */ + bool allow_relocs; + struct thermal_cooling_device *cooling; };