Re: [PATCH 19/19] drm/msm: show process names in gem_describe

[Bjorn Andersson]

On Thu 13 Aug 21:41 CDT 2020, Rob Clark wrote:

> From: Rob Clark <robdclark@xxxxxxxxxxxx>
> 
> In $debugfs/gem we already show any vma(s) associated with an object.
> Also show process names if the vma's address space is a per-process
> address space.
> 

Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>

> Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/msm/msm_drv.c     |  2 +-
>  drivers/gpu/drm/msm/msm_gem.c     | 25 +++++++++++++++++++++----
>  drivers/gpu/drm/msm/msm_gem.h     |  5 +++++
>  drivers/gpu/drm/msm/msm_gem_vma.c |  1 +
>  drivers/gpu/drm/msm/msm_gpu.c     |  8 +++++---
>  drivers/gpu/drm/msm/msm_gpu.h     |  2 +-
>  6 files changed, 34 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 8e70d220bba8..8d5c4f98c332 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -597,7 +597,7 @@ static int context_init(struct drm_device *dev, struct drm_file *file)
>  	kref_init(&ctx->ref);
>  	msm_submitqueue_init(dev, ctx);
>  
> -	ctx->aspace = msm_gpu_create_private_address_space(priv->gpu);
> +	ctx->aspace = msm_gpu_create_private_address_space(priv->gpu, current);
>  	file->driver_priv = ctx;
>  
>  	return 0;
> diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
> index 3cb7aeb93fd3..76a6c5271e57 100644
> --- a/drivers/gpu/drm/msm/msm_gem.c
> +++ b/drivers/gpu/drm/msm/msm_gem.c
> @@ -842,11 +842,28 @@ void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
>  
>  		seq_puts(m, "      vmas:");
>  
> -		list_for_each_entry(vma, &msm_obj->vmas, list)
> -			seq_printf(m, " [%s: %08llx,%s,inuse=%d]",
> -				vma->aspace != NULL ? vma->aspace->name : NULL,
> -				vma->iova, vma->mapped ? "mapped" : "unmapped",
> +		list_for_each_entry(vma, &msm_obj->vmas, list) {
> +			const char *name, *comm;
> +			if (vma->aspace) {
> +				struct msm_gem_address_space *aspace = vma->aspace;
> +				struct task_struct *task =
> +					get_pid_task(aspace->pid, PIDTYPE_PID);
> +				if (task) {
> +					comm = kstrdup(task->comm, GFP_KERNEL);
> +				} else {
> +					comm = NULL;
> +				}
> +				name = aspace->name;
> +			} else {
> +				name = comm = NULL;
> +			}
> +			seq_printf(m, " [%s%s%s: aspace=%p, %08llx,%s,inuse=%d]",
> +				name, comm ? ":" : "", comm ? comm : "",
> +				vma->aspace, vma->iova,
> +				vma->mapped ? "mapped" : "unmapped",
>  				vma->inuse);
> +			kfree(comm);
> +		}
>  
>  		seq_puts(m, "\n");
>  	}
> diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
> index 9c573c4269cb..7b1c7a5f8eef 100644
> --- a/drivers/gpu/drm/msm/msm_gem.h
> +++ b/drivers/gpu/drm/msm/msm_gem.h
> @@ -24,6 +24,11 @@ struct msm_gem_address_space {
>  	spinlock_t lock; /* Protects drm_mm node allocation/removal */
>  	struct msm_mmu *mmu;
>  	struct kref kref;
> +
> +	/* For address spaces associated with a specific process, this
> +	 * will be non-NULL:
> +	 */
> +	struct pid *pid;
>  };
>  
>  struct msm_gem_vma {
> diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c
> index 29cc1305cf37..80a8a266d68f 100644
> --- a/drivers/gpu/drm/msm/msm_gem_vma.c
> +++ b/drivers/gpu/drm/msm/msm_gem_vma.c
> @@ -17,6 +17,7 @@ msm_gem_address_space_destroy(struct kref *kref)
>  	drm_mm_takedown(&aspace->mm);
>  	if (aspace->mmu)
>  		aspace->mmu->funcs->destroy(aspace->mmu);
> +	put_pid(aspace->pid);
>  	kfree(aspace);
>  }
>  
> diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
> index 951850804d77..ac8961187a73 100644
> --- a/drivers/gpu/drm/msm/msm_gpu.c
> +++ b/drivers/gpu/drm/msm/msm_gpu.c
> @@ -825,10 +825,9 @@ static int get_clocks(struct platform_device *pdev, struct msm_gpu *gpu)
>  
>  /* Return a new address space for a msm_drm_private instance */
>  struct msm_gem_address_space *
> -msm_gpu_create_private_address_space(struct msm_gpu *gpu)
> +msm_gpu_create_private_address_space(struct msm_gpu *gpu, struct task_struct *task)
>  {
>  	struct msm_gem_address_space *aspace = NULL;
> -
>  	if (!gpu)
>  		return NULL;
>  
> @@ -836,8 +835,11 @@ msm_gpu_create_private_address_space(struct msm_gpu *gpu)
>  	 * If the target doesn't support private address spaces then return
>  	 * the global one
>  	 */
> -	if (gpu->funcs->create_private_address_space)
> +	if (gpu->funcs->create_private_address_space) {
>  		aspace = gpu->funcs->create_private_address_space(gpu);
> +		if (!IS_ERR(aspace))
> +			aspace->pid = get_pid(task_pid(task));
> +	}
>  
>  	if (IS_ERR_OR_NULL(aspace))
>  		aspace = msm_gem_address_space_get(gpu->aspace);
> diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
> index 4052a18e18c2..59f26bd0fe42 100644
> --- a/drivers/gpu/drm/msm/msm_gpu.h
> +++ b/drivers/gpu/drm/msm/msm_gpu.h
> @@ -298,7 +298,7 @@ int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,
>  		const char *name, struct msm_gpu_config *config);
>  
>  struct msm_gem_address_space *
> -msm_gpu_create_private_address_space(struct msm_gpu *gpu);
> +msm_gpu_create_private_address_space(struct msm_gpu *gpu, struct task_struct *task);
>  
>  void msm_gpu_cleanup(struct msm_gpu *gpu);
>  
> -- 
> 2.26.2
>