[PATCH 1/2] drm/i915: Remove asynchronous vma binding
Maarten Lankhorst
maarten.lankhorst at linux.intel.com
Tue Apr 20 10:34:50 UTC 2021
Commit e3793468b466 ("drm/i915: Use the async worker to avoid reclaim
tainting the ggtt->mutex") moves the vma binding to dma_fence_work,
but dma_fence_work has has signalling fence semantics.
On braswell, we can call stop_machine inside fence_work, causing a splat
because memory allocation inside stop_machine is allowed.
This patch does not fix that lockdep splat yet, but will allow the next
patch to remove it.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Acked-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 3 -
drivers/gpu/drm/i915/gt/gen6_ppgtt.c | 1 -
drivers/gpu/drm/i915/gt/gen8_ppgtt.c | 1 -
drivers/gpu/drm/i915/gt/intel_ggtt.c | 4 -
drivers/gpu/drm/i915/gt/intel_gtt.h | 2 -
drivers/gpu/drm/i915/i915_gem.c | 6 -
drivers/gpu/drm/i915/i915_vma.c | 174 +++------------------
drivers/gpu/drm/i915/i915_vma.h | 5 +-
drivers/gpu/drm/i915/i915_vma_types.h | 3 -
9 files changed, 21 insertions(+), 178 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
index b0597de206de..ec04df0a3b89 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
@@ -505,9 +505,6 @@ static void dbg_poison(struct i915_ggtt *ggtt,
if (!drm_mm_node_allocated(&ggtt->error_capture))
return;
- if (ggtt->vm.bind_async_flags & I915_VMA_GLOBAL_BIND)
- return; /* beware stop_machine() inversion */
-
GEM_BUG_ON(!IS_ALIGNED(size, PAGE_SIZE));
mutex_lock(&ggtt->error_mutex);
diff --git a/drivers/gpu/drm/i915/gt/gen6_ppgtt.c b/drivers/gpu/drm/i915/gt/gen6_ppgtt.c
index e08dff376339..0c5a9a767849 100644
--- a/drivers/gpu/drm/i915/gt/gen6_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen6_ppgtt.c
@@ -436,7 +436,6 @@ struct i915_ppgtt *gen6_ppgtt_create(struct intel_gt *gt)
ppgtt->base.vm.pd_shift = ilog2(SZ_4K * SZ_4K / sizeof(gen6_pte_t));
ppgtt->base.vm.top = 1;
- ppgtt->base.vm.bind_async_flags = I915_VMA_LOCAL_BIND;
ppgtt->base.vm.allocate_va_range = gen6_alloc_va_range;
ppgtt->base.vm.clear_range = gen6_ppgtt_clear_range;
ppgtt->base.vm.insert_entries = gen6_ppgtt_insert_entries;
diff --git a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
index 176c19633412..92f8a23e66cc 100644
--- a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
@@ -736,7 +736,6 @@ struct i915_ppgtt *gen8_ppgtt_create(struct intel_gt *gt)
goto err_free_pd;
}
- ppgtt->vm.bind_async_flags = I915_VMA_LOCAL_BIND;
ppgtt->vm.insert_entries = gen8_ppgtt_insert;
ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc;
ppgtt->vm.clear_range = gen8_ppgtt_clear;
diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt.c b/drivers/gpu/drm/i915/gt/intel_ggtt.c
index 670c1271e7d5..e1ec6edae1fb 100644
--- a/drivers/gpu/drm/i915/gt/intel_ggtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c
@@ -127,7 +127,6 @@ void i915_ggtt_suspend(struct i915_ggtt *ggtt)
list_for_each_entry_safe(vma, vn, &ggtt->vm.bound_list, vm_link) {
GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
- i915_vma_wait_for_bind(vma);
if (i915_vma_is_pinned(vma))
continue;
@@ -671,7 +670,6 @@ static int init_aliasing_ppgtt(struct i915_ggtt *ggtt)
ppgtt->vm.allocate_va_range(&ppgtt->vm, &stash, 0, ggtt->vm.total);
ggtt->alias = ppgtt;
- ggtt->vm.bind_async_flags |= ppgtt->vm.bind_async_flags;
GEM_BUG_ON(ggtt->vm.vma_ops.bind_vma != ggtt_bind_vma);
ggtt->vm.vma_ops.bind_vma = aliasing_gtt_bind_vma;
@@ -911,8 +909,6 @@ static int gen8_gmch_probe(struct i915_ggtt *ggtt)
IS_CHERRYVIEW(i915) /* fails with concurrent use/update */) {
ggtt->vm.insert_entries = bxt_vtd_ggtt_insert_entries__BKL;
ggtt->vm.insert_page = bxt_vtd_ggtt_insert_page__BKL;
- ggtt->vm.bind_async_flags =
- I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND;
}
ggtt->invalidate = gen8_ggtt_invalidate;
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
index e67e34e17913..d9d2ca8b4b61 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -230,8 +230,6 @@ struct i915_address_space {
u64 total; /* size addr space maps (ex. 2GB for ggtt) */
u64 reserved; /* size addr space reserved */
- unsigned int bind_async_flags;
-
/*
* Each active user context has its own address space (in full-ppgtt).
* Since the vm may be shared between multiple contexts, we count how
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index b23f58e94cfb..4639c47c038b 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -946,12 +946,6 @@ i915_gem_object_ggtt_pin_ww(struct drm_i915_gem_object *obj,
mutex_unlock(&ggtt->vm.mutex);
}
- ret = i915_vma_wait_for_bind(vma);
- if (ret) {
- i915_vma_unpin(vma);
- return ERR_PTR(ret);
- }
-
return vma;
}
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index 07490db51cdc..e4b2590d41ce 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -289,79 +289,6 @@ i915_vma_instance(struct drm_i915_gem_object *obj,
return vma;
}
-struct i915_vma_work {
- struct dma_fence_work base;
- struct i915_address_space *vm;
- struct i915_vm_pt_stash stash;
- struct i915_vma *vma;
- struct drm_i915_gem_object *pinned;
- struct i915_sw_dma_fence_cb cb;
- enum i915_cache_level cache_level;
- unsigned int flags;
-};
-
-static int __vma_bind(struct dma_fence_work *work)
-{
- struct i915_vma_work *vw = container_of(work, typeof(*vw), base);
- struct i915_vma *vma = vw->vma;
-
- vma->ops->bind_vma(vw->vm, &vw->stash,
- vma, vw->cache_level, vw->flags);
- return 0;
-}
-
-static void __vma_release(struct dma_fence_work *work)
-{
- struct i915_vma_work *vw = container_of(work, typeof(*vw), base);
-
- if (vw->pinned) {
- __i915_gem_object_unpin_pages(vw->pinned);
- i915_gem_object_put(vw->pinned);
- }
-
- i915_vm_free_pt_stash(vw->vm, &vw->stash);
- i915_vm_put(vw->vm);
-}
-
-static const struct dma_fence_work_ops bind_ops = {
- .name = "bind",
- .work = __vma_bind,
- .release = __vma_release,
-};
-
-struct i915_vma_work *i915_vma_work(void)
-{
- struct i915_vma_work *vw;
-
- vw = kzalloc(sizeof(*vw), GFP_KERNEL);
- if (!vw)
- return NULL;
-
- dma_fence_work_init(&vw->base, &bind_ops);
- vw->base.dma.error = -EAGAIN; /* disable the worker by default */
-
- return vw;
-}
-
-int i915_vma_wait_for_bind(struct i915_vma *vma)
-{
- int err = 0;
-
- if (rcu_access_pointer(vma->active.excl.fence)) {
- struct dma_fence *fence;
-
- rcu_read_lock();
- fence = dma_fence_get_rcu_safe(&vma->active.excl.fence);
- rcu_read_unlock();
- if (fence) {
- err = dma_fence_wait(fence, MAX_SCHEDULE_TIMEOUT);
- dma_fence_put(fence);
- }
- }
-
- return err;
-}
-
/**
* i915_vma_bind - Sets up PTEs for an VMA in it's corresponding address space.
* @vma: VMA to map
@@ -375,8 +302,7 @@ int i915_vma_wait_for_bind(struct i915_vma *vma)
*/
int i915_vma_bind(struct i915_vma *vma,
enum i915_cache_level cache_level,
- u32 flags,
- struct i915_vma_work *work)
+ u32 flags, struct i915_vm_pt_stash *stash)
{
u32 bind_flags;
u32 vma_flags;
@@ -405,39 +331,7 @@ int i915_vma_bind(struct i915_vma *vma,
GEM_BUG_ON(!vma->pages);
trace_i915_vma_bind(vma, bind_flags);
- if (work && bind_flags & vma->vm->bind_async_flags) {
- struct dma_fence *prev;
-
- work->vma = vma;
- work->cache_level = cache_level;
- work->flags = bind_flags;
-
- /*
- * Note we only want to chain up to the migration fence on
- * the pages (not the object itself). As we don't track that,
- * yet, we have to use the exclusive fence instead.
- *
- * Also note that we do not want to track the async vma as
- * part of the obj->resv->excl_fence as it only affects
- * execution and not content or object's backing store lifetime.
- */
- prev = i915_active_set_exclusive(&vma->active, &work->base.dma);
- if (prev) {
- __i915_sw_fence_await_dma_fence(&work->base.chain,
- prev,
- &work->cb);
- dma_fence_put(prev);
- }
-
- work->base.dma.error = 0; /* enable the queue_work() */
-
- if (vma->obj) {
- __i915_gem_object_pin_pages(vma->obj);
- work->pinned = i915_gem_object_get(vma->obj);
- }
- } else {
- vma->ops->bind_vma(vma->vm, NULL, vma, cache_level, bind_flags);
- }
+ vma->ops->bind_vma(vma->vm, stash, vma, cache_level, bind_flags);
atomic_or(bind_flags, &vma->flags);
return 0;
@@ -531,9 +425,6 @@ bool i915_vma_misplaced(const struct i915_vma *vma,
if (!drm_mm_node_allocated(&vma->node))
return false;
- if (test_bit(I915_VMA_ERROR_BIT, __i915_vma_flags(vma)))
- return true;
-
if (vma->node.size < size)
return true;
@@ -752,7 +643,7 @@ static bool try_qad_pin(struct i915_vma *vma, unsigned int flags)
if (unlikely(flags & ~bound))
return false;
- if (unlikely(bound & (I915_VMA_OVERFLOW | I915_VMA_ERROR)))
+ if (unlikely(bound & I915_VMA_OVERFLOW))
return false;
if (!(bound & I915_VMA_PIN_MASK))
@@ -770,7 +661,7 @@ static bool try_qad_pin(struct i915_vma *vma, unsigned int flags)
*/
mutex_lock(&vma->vm->mutex);
do {
- if (unlikely(bound & (I915_VMA_OVERFLOW | I915_VMA_ERROR))) {
+ if (unlikely(bound & I915_VMA_OVERFLOW)) {
pinned = false;
break;
}
@@ -857,10 +748,10 @@ static void vma_unbind_pages(struct i915_vma *vma)
int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
u64 size, u64 alignment, u64 flags)
{
- struct i915_vma_work *work = NULL;
intel_wakeref_t wakeref = 0;
unsigned int bound;
int err;
+ struct i915_vm_pt_stash stash = {};
#ifdef CONFIG_PROVE_LOCKING
if (debug_locks && !WARN_ON(!ww) && vma->resv)
@@ -883,33 +774,21 @@ int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
if (flags & PIN_GLOBAL)
wakeref = intel_runtime_pm_get(&vma->vm->i915->runtime_pm);
- if (flags & vma->vm->bind_async_flags) {
- /* lock VM */
- err = i915_vm_lock_objects(vma->vm, ww);
+ if (vma->vm->allocate_va_range) {
+ err = i915_vm_alloc_pt_stash(vma->vm,
+ &stash,
+ vma->size);
if (err)
goto err_rpm;
- work = i915_vma_work();
- if (!work) {
- err = -ENOMEM;
+ err = i915_vm_lock_objects(vma->vm, ww);
+ if (err)
goto err_rpm;
- }
- work->vm = i915_vm_get(vma->vm);
-
- /* Allocate enough page directories to used PTE */
- if (vma->vm->allocate_va_range) {
- err = i915_vm_alloc_pt_stash(vma->vm,
- &work->stash,
- vma->size);
- if (err)
- goto err_fence;
-
- err = i915_vm_pin_pt_stash(vma->vm,
- &work->stash);
- if (err)
- goto err_fence;
- }
+ err = i915_vm_pin_pt_stash(vma->vm,
+ &stash);
+ if (err)
+ goto err_rpm;
}
/*
@@ -932,7 +811,7 @@ int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
err = mutex_lock_interruptible_nested(&vma->vm->mutex,
!(flags & PIN_GLOBAL));
if (err)
- goto err_fence;
+ goto err_rpm;
/* No more allocations allowed now we hold vm->mutex */
@@ -942,11 +821,6 @@ int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
}
bound = atomic_read(&vma->flags);
- if (unlikely(bound & I915_VMA_ERROR)) {
- err = -ENOMEM;
- goto err_unlock;
- }
-
if (unlikely(!((bound + 1) & I915_VMA_PIN_MASK))) {
err = -EAGAIN; /* pins are meant to be fairly temporary */
goto err_unlock;
@@ -973,7 +847,7 @@ int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
GEM_BUG_ON(!vma->pages);
err = i915_vma_bind(vma,
vma->obj ? vma->obj->cache_level : 0,
- flags, work);
+ flags, &stash);
if (err)
goto err_remove;
@@ -996,10 +870,8 @@ int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
i915_active_release(&vma->active);
err_unlock:
mutex_unlock(&vma->vm->mutex);
-err_fence:
- if (work)
- dma_fence_work_commit_imm(&work->base);
err_rpm:
+ i915_vm_free_pt_stash(vma->vm, &stash);
if (wakeref)
intel_runtime_pm_put(&vma->vm->i915->runtime_pm, wakeref);
vma_put_pages(vma);
@@ -1034,14 +906,8 @@ int i915_ggtt_pin(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
err = i915_vma_pin_ww(vma, ww, 0, align, flags | PIN_GLOBAL);
else
err = i915_vma_pin(vma, 0, align, flags | PIN_GLOBAL);
- if (err != -ENOSPC) {
- if (!err) {
- err = i915_vma_wait_for_bind(vma);
- if (err)
- i915_vma_unpin(vma);
- }
+ if (err != -ENOSPC)
return err;
- }
/* Unlike i915_vma_pin, we don't take no for an answer! */
flush_idle_contexts(vm->gt);
@@ -1306,7 +1172,7 @@ void __i915_vma_evict(struct i915_vma *vma)
trace_i915_vma_unbind(vma);
vma->ops->unbind_vma(vma->vm, vma);
}
- atomic_and(~(I915_VMA_BIND_MASK | I915_VMA_ERROR | I915_VMA_GGTT_WRITE),
+ atomic_and(~(I915_VMA_BIND_MASK | I915_VMA_GGTT_WRITE),
&vma->flags);
i915_vma_detach(vma);
diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
index 8df784a026d2..d1d0fc76ef99 100644
--- a/drivers/gpu/drm/i915/i915_vma.h
+++ b/drivers/gpu/drm/i915/i915_vma.h
@@ -195,11 +195,10 @@ i915_vma_compare(struct i915_vma *vma,
return memcmp(&vma->ggtt_view.partial, &view->partial, view->type);
}
-struct i915_vma_work *i915_vma_work(void);
int i915_vma_bind(struct i915_vma *vma,
enum i915_cache_level cache_level,
u32 flags,
- struct i915_vma_work *work);
+ struct i915_vm_pt_stash *stash);
bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long color);
bool i915_vma_misplaced(const struct i915_vma *vma,
@@ -418,8 +417,6 @@ struct i915_vma *i915_vma_make_unshrinkable(struct i915_vma *vma);
void i915_vma_make_shrinkable(struct i915_vma *vma);
void i915_vma_make_purgeable(struct i915_vma *vma);
-int i915_vma_wait_for_bind(struct i915_vma *vma);
-
static inline int i915_vma_sync(struct i915_vma *vma)
{
/* Wait for the asynchronous bindings and pending GPU reads */
diff --git a/drivers/gpu/drm/i915/i915_vma_types.h b/drivers/gpu/drm/i915/i915_vma_types.h
index 6b1bfa230b82..82868a755a96 100644
--- a/drivers/gpu/drm/i915/i915_vma_types.h
+++ b/drivers/gpu/drm/i915/i915_vma_types.h
@@ -240,9 +240,6 @@ struct i915_vma {
#define I915_VMA_ALLOC_BIT 12
-#define I915_VMA_ERROR_BIT 13
-#define I915_VMA_ERROR ((int)BIT(I915_VMA_ERROR_BIT))
-
#define I915_VMA_GGTT_BIT 14
#define I915_VMA_CAN_FENCE_BIT 15
#define I915_VMA_USERFAULT_BIT 16
--
2.31.0
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