[PATCH 1/8] drm/msm: ratelimit GEM related WARN_ON()s

Rob Clark
2021-04-05T17:42:10Z

If you mess something up, you don't really need to see the same warn on
splat 4000 times pumped out a slow debug UART port..

Signed-off-by: Rob Clark <robdclark@chromium.org>
---
drivers/gpu/drm/msm/msm_gem.c | 66 +++++++++++++++++------------------
drivers/gpu/drm/msm/msm_gem.h | 19 ++++++----
2 files changed, 45 insertions(+), 40 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 4e91b095ab77..d5abe8aa9978 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -96,7 +96,7 @@ static struct page **get_pages(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);

- WARN_ON(!msm_gem_is_locked(obj));
+ GEM_WARN_ON(!msm_gem_is_locked(obj));

if (!msm_obj->pages) {
struct drm_device *dev = obj->dev;
@@ -180,7 +180,7 @@ struct page **msm_gem_get_pages(struct drm_gem_object *obj)

msm_gem_lock(obj);

- if (WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED)) {
+ if (GEM_WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED)) {
msm_gem_unlock(obj);
return ERR_PTR(-EBUSY);
}
@@ -256,7 +256,7 @@ static vm_fault_t msm_gem_fault(struct vm_fault *vmf)
goto out;
}

- if (WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED)) {
+ if (GEM_WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED)) {
msm_gem_unlock(obj);
return VM_FAULT_SIGBUS;
}
@@ -289,7 +289,7 @@ static uint64_t mmap_offset(struct drm_gem_object *obj)
struct drm_device *dev = obj->dev;
int ret;

- WARN_ON(!msm_gem_is_locked(obj));
+ GEM_WARN_ON(!msm_gem_is_locked(obj));

/* Make it mmapable */
ret = drm_gem_create_mmap_offset(obj);
@@ -318,7 +318,7 @@ static struct msm_gem_vma *add_vma(struct drm_gem_object *obj,
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct msm_gem_vma *vma;

- WARN_ON(!msm_gem_is_locked(obj));
+ GEM_WARN_ON(!msm_gem_is_locked(obj));

vma = kzalloc(sizeof(*vma), GFP_KERNEL);
if (!vma)
@@ -337,7 +337,7 @@ static struct msm_gem_vma *lookup_vma(struct drm_gem_object *obj,
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct msm_gem_vma *vma;

- WARN_ON(!msm_gem_is_locked(obj));
+ GEM_WARN_ON(!msm_gem_is_locked(obj));

list_for_each_entry(vma, &msm_obj->vmas, list) {
if (vma->aspace == aspace)
@@ -363,7 +363,7 @@ put_iova_spaces(struct drm_gem_object *obj)
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct msm_gem_vma *vma;

- WARN_ON(!msm_gem_is_locked(obj));
+ GEM_WARN_ON(!msm_gem_is_locked(obj));

list_for_each_entry(vma, &msm_obj->vmas, list) {
if (vma->aspace) {
@@ -380,7 +380,7 @@ put_iova_vmas(struct drm_gem_object *obj)
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct msm_gem_vma *vma, *tmp;

- WARN_ON(!msm_gem_is_locked(obj));
+ GEM_WARN_ON(!msm_gem_is_locked(obj));

list_for_each_entry_safe(vma, tmp, &msm_obj->vmas, list) {
del_vma(vma);
@@ -394,7 +394,7 @@ static int get_iova_locked(struct drm_gem_object *obj,
struct msm_gem_vma *vma;
int ret = 0;

- WARN_ON(!msm_gem_is_locked(obj));
+ GEM_WARN_ON(!msm_gem_is_locked(obj));

vma = lookup_vma(obj, aspace);

@@ -429,13 +429,13 @@ static int msm_gem_pin_iova(struct drm_gem_object *obj,
if (msm_obj->flags & MSM_BO_MAP_PRIV)
prot |= IOMMU_PRIV;

- WARN_ON(!msm_gem_is_locked(obj));
+ GEM_WARN_ON(!msm_gem_is_locked(obj));

- if (WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED))
+ if (GEM_WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED))
return -EBUSY;

vma = lookup_vma(obj, aspace);
- if (WARN_ON(!vma))
+ if (GEM_WARN_ON(!vma))
return -EINVAL;

pages = get_pages(obj);
@@ -453,7 +453,7 @@ static int get_and_pin_iova_range_locked(struct drm_gem_object *obj,
u64 local;
int ret;

- WARN_ON(!msm_gem_is_locked(obj));
+ GEM_WARN_ON(!msm_gem_is_locked(obj));

ret = get_iova_locked(obj, aspace, &local,
range_start, range_end);
@@ -524,7 +524,7 @@ uint64_t msm_gem_iova(struct drm_gem_object *obj,
msm_gem_lock(obj);
vma = lookup_vma(obj, aspace);
msm_gem_unlock(obj);
- WARN_ON(!vma);
+ GEM_WARN_ON(!vma);

return vma ? vma->iova : 0;
}
@@ -537,11 +537,11 @@ void msm_gem_unpin_iova_locked(struct drm_gem_object *obj,
{
struct msm_gem_vma *vma;

- WARN_ON(!msm_gem_is_locked(obj));
+ GEM_WARN_ON(!msm_gem_is_locked(obj));

vma = lookup_vma(obj, aspace);

- if (!WARN_ON(!vma))
+ if (!GEM_WARN_ON(!vma))
msm_gem_unmap_vma(aspace, vma);
}

@@ -593,12 +593,12 @@ static void *get_vaddr(struct drm_gem_object *obj, unsigned madv)
struct msm_gem_object *msm_obj = to_msm_bo(obj);
int ret = 0;

- WARN_ON(!msm_gem_is_locked(obj));
+ GEM_WARN_ON(!msm_gem_is_locked(obj));

if (obj->import_attach)
return ERR_PTR(-ENODEV);

- if (WARN_ON(msm_obj->madv > madv)) {
+ if (GEM_WARN_ON(msm_obj->madv > madv)) {
DRM_DEV_ERROR(obj->dev->dev, "Invalid madv state: %u vs %u\n",
msm_obj->madv, madv);
return ERR_PTR(-EBUSY);
@@ -664,8 +664,8 @@ void msm_gem_put_vaddr_locked(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);

- WARN_ON(!msm_gem_is_locked(obj));
- WARN_ON(msm_obj->vmap_count < 1);
+ GEM_WARN_ON(!msm_gem_is_locked(obj));
+ GEM_WARN_ON(msm_obj->vmap_count < 1);

msm_obj->vmap_count--;
}
@@ -707,8 +707,8 @@ void msm_gem_purge(struct drm_gem_object *obj)
struct drm_device *dev = obj->dev;
struct msm_gem_object *msm_obj = to_msm_bo(obj);

- WARN_ON(!is_purgeable(msm_obj));
- WARN_ON(obj->import_attach);
+ GEM_WARN_ON(!is_purgeable(msm_obj));
+ GEM_WARN_ON(obj->import_attach);

put_iova_spaces(obj);

@@ -739,9 +739,9 @@ void msm_gem_vunmap(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);

- WARN_ON(!msm_gem_is_locked(obj));
+ GEM_WARN_ON(!msm_gem_is_locked(obj));

- if (!msm_obj->vaddr || WARN_ON(!is_vunmapable(msm_obj)))
+ if (!msm_obj->vaddr || GEM_WARN_ON(!is_vunmapable(msm_obj)))
return;

vunmap(msm_obj->vaddr);
@@ -789,9 +789,9 @@ void msm_gem_active_get(struct drm_gem_object *obj, struct msm_gpu *gpu)
struct msm_drm_private *priv = obj->dev->dev_private;

might_sleep();
- WARN_ON(!msm_gem_is_locked(obj));
- WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED);
- WARN_ON(msm_obj->dontneed);
+ GEM_WARN_ON(!msm_gem_is_locked(obj));
+ GEM_WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED);
+ GEM_WARN_ON(msm_obj->dontneed);

if (msm_obj->active_count++ == 0) {
mutex_lock(&priv->mm_lock);
@@ -806,7 +806,7 @@ void msm_gem_active_put(struct drm_gem_object *obj)
struct msm_gem_object *msm_obj = to_msm_bo(obj);

might_sleep();
- WARN_ON(!msm_gem_is_locked(obj));
+ GEM_WARN_ON(!msm_gem_is_locked(obj));

if (--msm_obj->active_count == 0) {
update_inactive(msm_obj);
@@ -818,7 +818,7 @@ static void update_inactive(struct msm_gem_object *msm_obj)
struct msm_drm_private *priv = msm_obj->base.dev->dev_private;

mutex_lock(&priv->mm_lock);
- WARN_ON(msm_obj->active_count != 0);
+ GEM_WARN_ON(msm_obj->active_count != 0);

if (msm_obj->dontneed)
mark_unpurgable(msm_obj);
@@ -830,7 +830,7 @@ static void update_inactive(struct msm_gem_object *msm_obj)
list_add_tail(&msm_obj->mm_list, &priv->inactive_dontneed);
mark_purgable(msm_obj);
} else {
- WARN_ON(msm_obj->madv != __MSM_MADV_PURGED);
+ GEM_WARN_ON(msm_obj->madv != __MSM_MADV_PURGED);
list_add_tail(&msm_obj->mm_list, &priv->inactive_purged);
}

@@ -1010,12 +1010,12 @@ void msm_gem_free_object(struct drm_gem_object *obj)
msm_gem_lock(obj);

/* object should not be on active list: */
- WARN_ON(is_active(msm_obj));
+ GEM_WARN_ON(is_active(msm_obj));

put_iova_spaces(obj);

if (obj->import_attach) {
- WARN_ON(msm_obj->vaddr);
+ GEM_WARN_ON(msm_obj->vaddr);

/* Don't drop the pages for imported dmabuf, as they are not
* ours, just free the array we allocated:
@@ -1131,7 +1131,7 @@ static struct drm_gem_object *_msm_gem_new(struct drm_device *dev,
else if ((flags & (MSM_BO_STOLEN | MSM_BO_SCANOUT)) && priv->vram.size)
use_vram = true;

- if (WARN_ON(use_vram && !priv->vram.size))
+ if (GEM_WARN_ON(use_vram && !priv->vram.size))
return ERR_PTR(-EINVAL);

/* Disallow zero sized objects as they make the underlying
diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
index 7c7d54bad189..917af526a5c5 100644
--- a/drivers/gpu/drm/msm/msm_gem.h
+++ b/drivers/gpu/drm/msm/msm_gem.h
@@ -11,6 +11,11 @@
#include <linux/dma-resv.h>
#include "msm_drv.h"

+/* Make all GEM related WARN_ON()s ratelimited.. when things go wrong they
+ * tend to go wrong 1000s of times in a short timespan.
+ */
+#define GEM_WARN_ON(x) WARN_RATELIMIT(x, "%s", __stringify(x))
+
/* Additional internal-use only BO flags: */
#define MSM_BO_STOLEN 0x10000000 /* try to use stolen/splash memory */
#define MSM_BO_MAP_PRIV 0x20000000 /* use IOMMU_PRIV when mapping */
@@ -203,7 +208,7 @@ msm_gem_is_locked(struct drm_gem_object *obj)

static inline bool is_active(struct msm_gem_object *msm_obj)
{
- WARN_ON(!msm_gem_is_locked(&msm_obj->base));
+ GEM_WARN_ON(!msm_gem_is_locked(&msm_obj->base));
return msm_obj->active_count;
}

@@ -221,7 +226,7 @@ static inline bool is_purgeable(struct msm_gem_object *msm_obj)

static inline bool is_vunmapable(struct msm_gem_object *msm_obj)
{
- WARN_ON(!msm_gem_is_locked(&msm_obj->base));
+ GEM_WARN_ON(!msm_gem_is_locked(&msm_obj->base));
return (msm_obj->vmap_count == 0) && msm_obj->vaddr;
}

@@ -229,12 +234,12 @@ static inline void mark_purgable(struct msm_gem_object *msm_obj)
{
struct msm_drm_private *priv = msm_obj->base.dev->dev_private;

- WARN_ON(!mutex_is_locked(&priv->mm_lock));
+ GEM_WARN_ON(!mutex_is_locked(&priv->mm_lock));

if (is_unpurgable(msm_obj))
return;

- if (WARN_ON(msm_obj->dontneed))
+ if (GEM_WARN_ON(msm_obj->dontneed))
return;

priv->shrinkable_count += msm_obj->base.size >> PAGE_SHIFT;
@@ -245,16 +250,16 @@ static inline void mark_unpurgable(struct msm_gem_object *msm_obj)
{
struct msm_drm_private *priv = msm_obj->base.dev->dev_private;

- WARN_ON(!mutex_is_locked(&priv->mm_lock));
+ GEM_WARN_ON(!mutex_is_locked(&priv->mm_lock));

if (is_unpurgable(msm_obj))
return;

- if (WARN_ON(!msm_obj->dontneed))
+ if (GEM_WARN_ON(!msm_obj->dontneed))
return;

priv->shrinkable_count -= msm_obj->base.size >> PAGE_SHIFT;
- WARN_ON(priv->shrinkable_count < 0);
+ GEM_WARN_ON(priv->shrinkable_count < 0);
msm_obj->dontneed = false;
}

--
2.30.2