[PATCH] drm/msm: Fix a few comments

[PATCH] drm/msm: Fix a few comments

[Rob Clark]

Fix a couple comments which had become (partially) obsolete or incorrect
with the gpuvm conversion.

Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
---
 drivers/gpu/drm/msm/msm_gem.h     | 2 +-
 drivers/gpu/drm/msm/msm_gem_vma.c | 5 +----
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
index 88239da1cd72..751c3b4965bc 100644
--- a/drivers/gpu/drm/msm/msm_gem.h
+++ b/drivers/gpu/drm/msm/msm_gem.h
@@ -100,7 +100,7 @@ struct msm_gem_vm {
 	 *
 	 * Only used for kernel managed VMs, unused for user managed VMs.
 	 *
-	 * Protected by @mm_lock.
+	 * Protected by vm lock.  See msm_gem_lock_vm_and_obj(), for ex.
 	 */
 	struct drm_mm mm;
 
diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c
index dc54c693b28d..d1f5bb2e0a16 100644
--- a/drivers/gpu/drm/msm/msm_gem_vma.c
+++ b/drivers/gpu/drm/msm/msm_gem_vma.c
@@ -319,13 +319,10 @@ msm_gem_vma_map(struct drm_gpuva *vma, int prot, struct sg_table *sgt)
 		mutex_lock(&vm->mmu_lock);
 
 	/*
-	 * NOTE: iommu/io-pgtable can allocate pages, so we cannot hold
+	 * NOTE: if not using pgtable preallocation, we cannot hold
 	 * a lock across map/unmap which is also used in the job_run()
 	 * path, as this can cause deadlock in job_run() vs shrinker/
 	 * reclaim.
-	 *
-	 * Revisit this if we can come up with a scheme to pre-alloc pages
-	 * for the pgtable in map/unmap ops.
 	 */
 	ret = vm_map_op(vm, &(struct msm_vm_map_op){
 		.iova = vma->va.addr,
-- 
2.50.1

Re: [PATCH] drm/msm: Fix a few comments

[Dmitry Baryshkov]

On Tue, Aug 05, 2025 at 09:43:08AM -0700, Rob Clark wrote:
> Fix a couple comments which had become (partially) obsolete or incorrect
> with the gpuvm conversion.
> 
> Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
> ---
>  drivers/gpu/drm/msm/msm_gem.h     | 2 +-
>  drivers/gpu/drm/msm/msm_gem_vma.c | 5 +----
>  2 files changed, 2 insertions(+), 5 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>


-- 
With best wishes
Dmitry