On 08/01/16 11:29, Tvrtko Ursulin wrote:
From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Purpose is to catch places which iterate the object VMA list
without holding the big lock.
Implemented by open coding list_for_each_entry to make the
macro compatible with existing call sites.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 8 ++++----
drivers/gpu/drm/i915/i915_drv.h | 6 ++++++
drivers/gpu/drm/i915/i915_gem.c | 24 ++++++++++++------------
drivers/gpu/drm/i915/i915_gem_gtt.c | 2 +-
drivers/gpu/drm/i915/i915_gem_shrinker.c | 2 +-
drivers/gpu/drm/i915/i915_gpu_error.c | 4 ++--
6 files changed, 26 insertions(+), 20 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 714a45cf8a51..d7c2a3201161 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -117,7 +117,7 @@ static u64 i915_gem_obj_total_ggtt_size(struct drm_i915_gem_object *obj)
u64 size = 0;
struct i915_vma *vma;
- list_for_each_entry(vma, &obj->vma_list, vma_link) {
+ i915_gem_obj_for_each_vma(vma, obj) {
if (i915_is_ggtt(vma->vm) &&
drm_mm_node_allocated(&vma->node))
size += vma->node.size;
@@ -155,7 +155,7 @@ describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj)
obj->madv == I915_MADV_DONTNEED ? " purgeable" : "");
if (obj->base.name)
seq_printf(m, " (name: %d)", obj->base.name);
- list_for_each_entry(vma, &obj->vma_list, vma_link) {
+ i915_gem_obj_for_each_vma(vma, obj) {
if (vma->pin_count > 0)
pin_count++;
}
@@ -164,7 +164,7 @@ describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj)
seq_printf(m, " (display)");
if (obj->fence_reg != I915_FENCE_REG_NONE)
seq_printf(m, " (fence: %d)", obj->fence_reg);
- list_for_each_entry(vma, &obj->vma_list, vma_link) {
+ i915_gem_obj_for_each_vma(vma, obj) {
seq_printf(m, " (%sgtt offset: %08llx, size: %08llx",
i915_is_ggtt(vma->vm) ? "g" : "pp",
vma->node.start, vma->node.size);
@@ -342,7 +342,7 @@ static int per_file_stats(int id, void *ptr, void *data)
stats->shared += obj->base.size;
if (USES_FULL_PPGTT(obj->base.dev)) {
- list_for_each_entry(vma, &obj->vma_list, vma_link) {
+ i915_gem_obj_for_each_vma(vma, obj) {
struct i915_hw_ppgtt *ppgtt;
if (!drm_mm_node_allocated(&vma->node))
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b77a5d84eac2..0406a020dfcc 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2852,6 +2852,12 @@ struct drm_i915_gem_object *i915_gem_object_create_from_data(
void i915_gem_free_object(struct drm_gem_object *obj);
void i915_gem_vma_destroy(struct i915_vma *vma);
+#define i915_gem_obj_for_each_vma(vma, obj) \
+ for (WARN_ON_ONCE(!mutex_is_locked(&(obj)->base.dev->struct_mutex)), \
+ vma = list_first_entry(&(obj)->vma_list, typeof(*vma), vma_link);\
+ &vma->vma_link != (&(obj)->vma_list); \
+ vma = list_next_entry(vma, vma_link))
+
Unfortunately error capture is not happy with this approach. Can't even
see that error capture attempts to grab the mutex anywhere.
So what? Drop the idea or add a "doing error capture" flag somewhere?
Regards,
Tvrtko
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