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

Rob Clark
2020-08-14T02:42:25Z

From: Rob Clark <robdclark@chromium.org>

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.

Signed-off-by: Rob Clark <robdclark@chromium.org>
---
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