diff mbox series

[RFC] drm/msm: Disallow relocs on a6xx+

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

Commit Message

Rob Clark Aug. 2, 2023, 10:10 p.m. UTC
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.

 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(+)

Comments

Daniel Vetter Aug. 3, 2023, 8:35 a.m. UTC | #1
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 mbox series

Patch

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;
 };