[PATCH 58/58] drm/i915: Finally remove obj->mm.lock.
Maarten Lankhorst
maarten.lankhorst at linux.intel.com
Wed Sep 23 08:42:47 UTC 2020
With all callers and selftests fixed to use ww locking, we can now
finally remove this lock.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
drivers/gpu/drm/i915/gem/i915_gem_object.c | 2 -
drivers/gpu/drm/i915/gem/i915_gem_object.h | 5 +--
.../gpu/drm/i915/gem/i915_gem_object_types.h | 1 -
drivers/gpu/drm/i915/gem/i915_gem_pages.c | 38 ++++---------------
drivers/gpu/drm/i915/gem/i915_gem_phys.c | 6 ---
drivers/gpu/drm/i915/gem/i915_gem_shmem.c | 2 +-
drivers/gpu/drm/i915/gem/i915_gem_shrinker.c | 37 +++++++++++++-----
drivers/gpu/drm/i915/gem/i915_gem_shrinker.h | 4 +-
drivers/gpu/drm/i915/gem/i915_gem_tiling.c | 2 -
drivers/gpu/drm/i915/gem/i915_gem_userptr.c | 3 +-
drivers/gpu/drm/i915/i915_debugfs.c | 4 +-
drivers/gpu/drm/i915/i915_gem.c | 8 +---
drivers/gpu/drm/i915/i915_gem_gtt.c | 2 +-
13 files changed, 45 insertions(+), 69 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c
index 1d29e18ea8dd..d96bbdb15627 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
@@ -53,8 +53,6 @@ void i915_gem_object_init(struct drm_i915_gem_object *obj,
const struct drm_i915_gem_object_ops *ops,
struct lock_class_key *key, unsigned flags)
{
- mutex_init(&obj->mm.lock);
-
spin_lock_init(&obj->vma.lock);
INIT_LIST_HEAD(&obj->vma.list);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index b6767adaa03b..6f9c86a3d836 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -126,7 +126,7 @@ static inline void assert_object_held_shared(struct drm_i915_gem_object *obj)
*/
if (IS_ENABLED(CONFIG_LOCKDEP) &&
kref_read(&obj->base.refcount) > 0)
- lockdep_assert_held(&obj->mm.lock);
+ assert_object_held(obj);
}
static inline int __i915_gem_object_lock(struct drm_i915_gem_object *obj,
@@ -314,7 +314,7 @@ int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj);
static inline int __must_check
i915_gem_object_pin_pages(struct drm_i915_gem_object *obj)
{
- might_lock(&obj->mm.lock);
+ assert_object_held(obj);
if (atomic_inc_not_zero(&obj->mm.pages_pin_count))
return 0;
@@ -360,7 +360,6 @@ i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
}
int __i915_gem_object_put_pages(struct drm_i915_gem_object *obj);
-int __i915_gem_object_put_pages_locked(struct drm_i915_gem_object *obj);
void i915_gem_object_truncate(struct drm_i915_gem_object *obj);
void i915_gem_object_writeback(struct drm_i915_gem_object *obj);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
index d3f65df6d6b3..09b4df17c5d1 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
@@ -201,7 +201,6 @@ struct drm_i915_gem_object {
* Protects the pages and their use. Do not use directly, but
* instead go through the pin/unpin interfaces.
*/
- struct mutex lock;
atomic_t pages_pin_count;
atomic_t shrink_pin;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
index 4f334e42272d..a3ae337bc9d9 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
@@ -65,7 +65,7 @@ void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj,
struct list_head *list;
unsigned long flags;
- lockdep_assert_held(&obj->mm.lock);
+ assert_object_held(obj);
spin_lock_irqsave(&i915->mm.obj_lock, flags);
i915->mm.shrink_count++;
@@ -112,9 +112,7 @@ int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
{
int err;
- err = mutex_lock_interruptible(&obj->mm.lock);
- if (err)
- return err;
+ assert_object_held(obj);
assert_object_held_shared(obj);
@@ -123,15 +121,13 @@ int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
err = ____i915_gem_object_get_pages(obj);
if (err)
- goto unlock;
+ return err;
smp_mb__before_atomic();
}
atomic_inc(&obj->mm.pages_pin_count);
-unlock:
- mutex_unlock(&obj->mm.lock);
- return err;
+ return 0;
}
int i915_gem_object_pin_pages_unlocked(struct drm_i915_gem_object *obj)
@@ -218,7 +214,7 @@ __i915_gem_object_unset_pages(struct drm_i915_gem_object *obj)
return pages;
}
-int __i915_gem_object_put_pages_locked(struct drm_i915_gem_object *obj)
+int __i915_gem_object_put_pages(struct drm_i915_gem_object *obj)
{
struct sg_table *pages;
@@ -249,21 +245,6 @@ int __i915_gem_object_put_pages_locked(struct drm_i915_gem_object *obj)
return 0;
}
-int __i915_gem_object_put_pages(struct drm_i915_gem_object *obj)
-{
- int err;
-
- if (i915_gem_object_has_pinned_pages(obj))
- return -EBUSY;
-
- /* May be called by shrinker from within get_pages() (on another bo) */
- mutex_lock(&obj->mm.lock);
- err = __i915_gem_object_put_pages_locked(obj);
- mutex_unlock(&obj->mm.lock);
-
- return err;
-}
-
static inline pte_t iomap_pte(resource_size_t base,
dma_addr_t offset,
pgprot_t prot)
@@ -380,9 +361,7 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
!i915_gem_object_type_has(obj, I915_GEM_OBJECT_HAS_IOMEM))
return ERR_PTR(-ENXIO);
- err = mutex_lock_interruptible(&obj->mm.lock);
- if (err)
- return ERR_PTR(err);
+ assert_object_held(obj);
pinned = !(type & I915_MAP_OVERRIDE);
type &= ~I915_MAP_OVERRIDE;
@@ -424,15 +403,12 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
obj->mm.mapping = page_pack_bits(ptr, type);
}
-out_unlock:
- mutex_unlock(&obj->mm.lock);
return ptr;
err_unpin:
atomic_dec(&obj->mm.pages_pin_count);
err_unlock:
- ptr = ERR_PTR(err);
- goto out_unlock;
+ return ERR_PTR(err);
}
void *i915_gem_object_pin_map_unlocked(struct drm_i915_gem_object *obj,
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_phys.c b/drivers/gpu/drm/i915/gem/i915_gem_phys.c
index 4322e35cfe48..78051d694d1b 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_phys.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_phys.c
@@ -186,10 +186,6 @@ int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align)
if (err)
return err;
- err = mutex_lock_interruptible(&obj->mm.lock);
- if (err)
- goto err_unlock;
-
if (unlikely(!i915_gem_object_has_struct_page(obj)))
goto out;
@@ -218,8 +214,6 @@ int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align)
err = i915_gem_object_shmem_to_phys(obj);
out:
- mutex_unlock(&obj->mm.lock);
-err_unlock:
i915_gem_object_unlock(obj);
return err;
}
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
index e0778b3cc0c3..5ae09be61c0b 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
@@ -99,7 +99,7 @@ static int shmem_get_pages(struct drm_i915_gem_object *obj)
goto err_sg;
}
- i915_gem_shrink(i915, 2 * page_count, NULL, *s++);
+ i915_gem_shrink(NULL, i915, 2 * page_count, NULL, *s++);
/*
* We've tried hard to allocate the memory by reaping
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c b/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
index afc6e5b4dcf1..e42192834c88 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
@@ -93,7 +93,8 @@ static void try_to_writeback(struct drm_i915_gem_object *obj,
* The number of pages of backing storage actually released.
*/
unsigned long
-i915_gem_shrink(struct drm_i915_private *i915,
+i915_gem_shrink(struct i915_gem_ww_ctx *ww,
+ struct drm_i915_private *i915,
unsigned long target,
unsigned long *nr_scanned,
unsigned int shrink)
@@ -112,6 +113,7 @@ i915_gem_shrink(struct drm_i915_private *i915,
intel_wakeref_t wakeref = 0;
unsigned long count = 0;
unsigned long scanned = 0;
+ int err;
trace_i915_gem_shrink(i915, target, shrink);
@@ -199,23 +201,38 @@ i915_gem_shrink(struct drm_i915_private *i915,
spin_unlock_irqrestore(&i915->mm.obj_lock, flags);
- if (unsafe_drop_pages(obj, shrink) &&
- mutex_trylock(&obj->mm.lock)) {
+ err = 0;
+ if (unsafe_drop_pages(obj, shrink)) {
/* May arrive from get_pages on another bo */
- if (!__i915_gem_object_put_pages_locked(obj)) {
+ if (!ww) {
+ if (!i915_gem_object_trylock(obj))
+ goto skip;
+ } else {
+ err = i915_gem_object_lock(obj, ww);
+ if (err)
+ goto skip;
+ }
+
+ if (!__i915_gem_object_put_pages(obj)) {
try_to_writeback(obj, shrink);
count += obj->base.size >> PAGE_SHIFT;
}
- mutex_unlock(&obj->mm.lock);
+ if (!ww)
+ i915_gem_object_unlock(obj);
}
scanned += obj->base.size >> PAGE_SHIFT;
+skip:
i915_gem_object_put(obj);
spin_lock_irqsave(&i915->mm.obj_lock, flags);
+ if (err)
+ break;
}
list_splice_tail(&still_in_list, phase->list);
spin_unlock_irqrestore(&i915->mm.obj_lock, flags);
+ if (err)
+ return err;
}
if (shrink & I915_SHRINK_BOUND)
@@ -246,7 +263,7 @@ unsigned long i915_gem_shrink_all(struct drm_i915_private *i915)
unsigned long freed = 0;
with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
- freed = i915_gem_shrink(i915, -1UL, NULL,
+ freed = i915_gem_shrink(NULL, i915, -1UL, NULL,
I915_SHRINK_BOUND |
I915_SHRINK_UNBOUND);
}
@@ -292,7 +309,7 @@ i915_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
sc->nr_scanned = 0;
- freed = i915_gem_shrink(i915,
+ freed = i915_gem_shrink(NULL, i915,
sc->nr_to_scan,
&sc->nr_scanned,
I915_SHRINK_BOUND |
@@ -301,7 +318,7 @@ i915_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
intel_wakeref_t wakeref;
with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
- freed += i915_gem_shrink(i915,
+ freed += i915_gem_shrink(NULL, i915,
sc->nr_to_scan - sc->nr_scanned,
&sc->nr_scanned,
I915_SHRINK_ACTIVE |
@@ -326,7 +343,7 @@ i915_gem_shrinker_oom(struct notifier_block *nb, unsigned long event, void *ptr)
freed_pages = 0;
with_intel_runtime_pm(&i915->runtime_pm, wakeref)
- freed_pages += i915_gem_shrink(i915, -1UL, NULL,
+ freed_pages += i915_gem_shrink(NULL, i915, -1UL, NULL,
I915_SHRINK_BOUND |
I915_SHRINK_UNBOUND |
I915_SHRINK_WRITEBACK);
@@ -364,7 +381,7 @@ i915_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr
intel_wakeref_t wakeref;
with_intel_runtime_pm(&i915->runtime_pm, wakeref)
- freed_pages += i915_gem_shrink(i915, -1UL, NULL,
+ freed_pages += i915_gem_shrink(NULL, i915, -1UL, NULL,
I915_SHRINK_BOUND |
I915_SHRINK_UNBOUND |
I915_SHRINK_VMAPS);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shrinker.h b/drivers/gpu/drm/i915/gem/i915_gem_shrinker.h
index b397d7785789..8512470f6fd6 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_shrinker.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_shrinker.h
@@ -9,10 +9,12 @@
#include <linux/bits.h>
struct drm_i915_private;
+struct i915_gem_ww_ctx;
struct mutex;
/* i915_gem_shrinker.c */
-unsigned long i915_gem_shrink(struct drm_i915_private *i915,
+unsigned long i915_gem_shrink(struct i915_gem_ww_ctx *ww,
+ struct drm_i915_private *i915,
unsigned long target,
unsigned long *nr_scanned,
unsigned flags);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_tiling.c b/drivers/gpu/drm/i915/gem/i915_gem_tiling.c
index ffcaee74a249..4523a14db86e 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_tiling.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_tiling.c
@@ -265,7 +265,6 @@ i915_gem_object_set_tiling(struct drm_i915_gem_object *obj,
* pages to prevent them being swapped out and causing corruption
* due to the change in swizzling.
*/
- mutex_lock(&obj->mm.lock);
if (i915_gem_object_has_pages(obj) &&
obj->mm.madv == I915_MADV_WILLNEED &&
i915->quirks & QUIRK_PIN_SWIZZLED_PAGES) {
@@ -280,7 +279,6 @@ i915_gem_object_set_tiling(struct drm_i915_gem_object *obj,
obj->mm.quirked = true;
}
}
- mutex_unlock(&obj->mm.lock);
spin_lock(&obj->vma.lock);
for_each_ggtt_vma(vma, obj) {
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
index e75481f8f496..d54af317829e 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
@@ -234,7 +234,7 @@ static int i915_gem_object_userptr_unbind(struct drm_i915_gem_object *obj, bool
if (GEM_WARN_ON(i915_gem_object_has_pinned_pages(obj)))
return -EBUSY;
- mutex_lock(&obj->mm.lock);
+ assert_object_held(obj);
pages = __i915_gem_object_unset_pages(obj);
if (!IS_ERR_OR_NULL(pages))
@@ -242,7 +242,6 @@ static int i915_gem_object_userptr_unbind(struct drm_i915_gem_object *obj, bool
if (get_pages)
err = ____i915_gem_object_get_pages(obj);
- mutex_unlock(&obj->mm.lock);
return err;
}
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 784219962193..20ad78826556 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1506,10 +1506,10 @@ i915_drop_caches_set(void *data, u64 val)
fs_reclaim_acquire(GFP_KERNEL);
if (val & DROP_BOUND)
- i915_gem_shrink(i915, LONG_MAX, NULL, I915_SHRINK_BOUND);
+ i915_gem_shrink(NULL, i915, LONG_MAX, NULL, I915_SHRINK_BOUND);
if (val & DROP_UNBOUND)
- i915_gem_shrink(i915, LONG_MAX, NULL, I915_SHRINK_UNBOUND);
+ i915_gem_shrink(NULL, i915, LONG_MAX, NULL, I915_SHRINK_UNBOUND);
if (val & DROP_SHRINK_ALL)
i915_gem_shrink_all(i915);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 6f19a52c8c79..dea557798c65 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1105,10 +1105,6 @@ i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
if (err)
goto out;
- err = mutex_lock_interruptible(&obj->mm.lock);
- if (err)
- goto out_ww;
-
if (i915_gem_object_has_pages(obj) &&
i915_gem_object_is_tiled(obj) &&
i915->quirks & QUIRK_PIN_SWIZZLED_PAGES) {
@@ -1151,9 +1147,7 @@ i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
i915_gem_object_truncate(obj);
args->retained = obj->mm.madv != __I915_MADV_PURGED;
- mutex_unlock(&obj->mm.lock);
-out_ww:
i915_gem_object_unlock(obj);
out:
i915_gem_object_put(obj);
@@ -1337,7 +1331,7 @@ int i915_gem_freeze_late(struct drm_i915_private *i915)
wakeref = intel_runtime_pm_get(&i915->runtime_pm);
- i915_gem_shrink(i915, -1UL, NULL, ~0);
+ i915_gem_shrink(NULL, i915, -1UL, NULL, ~0);
i915_gem_drain_freed_objects(i915);
list_for_each_entry(obj, &i915->mm.shrink_list, mm.link) {
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index c5ee1567f3d1..729074ee33d4 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -44,7 +44,7 @@ int i915_gem_gtt_prepare_pages(struct drm_i915_gem_object *obj,
* the DMA remapper, i915_gem_shrink will return 0.
*/
GEM_BUG_ON(obj->mm.pages == pages);
- } while (i915_gem_shrink(to_i915(obj->base.dev),
+ } while (i915_gem_shrink(NULL, to_i915(obj->base.dev),
obj->base.size >> PAGE_SHIFT, NULL,
I915_SHRINK_BOUND |
I915_SHRINK_UNBOUND));
--
2.28.0
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