[PATCH 06/15] drm/i915/gem: Only call eb_lookup_vma once during execbuf ioctl
Chris Wilson
chris at chris-wilson.co.uk
Sun Mar 1 11:33:46 UTC 2020
As we no longer stash anything inside i915_vma under the exclusive
protection of struct_mutex, we do not need to revoke the i915_vma
stashes before dropping struct_mutex to handle pagefaults. Knowing that
we must drop the struct_mutex while keeping the eb->vma around, means
that we are required to hold onto to the object reference until we have
marked the vma as active.
Fixes: 155ab8836caa ("drm/i915: Move object close under its own lock")
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
.../gpu/drm/i915/gem/i915_gem_execbuffer.c | 107 +++++++-----------
1 file changed, 42 insertions(+), 65 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 9c888561a636..577c84872acc 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -47,17 +47,15 @@ enum {
#define DBG_FORCE_RELOC 0 /* choose one of the above! */
};
-#define __EXEC_OBJECT_HAS_REF BIT(31)
-#define __EXEC_OBJECT_HAS_PIN BIT(30)
-#define __EXEC_OBJECT_HAS_FENCE BIT(29)
-#define __EXEC_OBJECT_NEEDS_MAP BIT(28)
-#define __EXEC_OBJECT_NEEDS_BIAS BIT(27)
-#define __EXEC_OBJECT_INTERNAL_FLAGS (~0u << 27) /* all of the above */
+#define __EXEC_OBJECT_HAS_PIN BIT(31)
+#define __EXEC_OBJECT_HAS_FENCE BIT(30)
+#define __EXEC_OBJECT_NEEDS_MAP BIT(29)
+#define __EXEC_OBJECT_NEEDS_BIAS BIT(28)
+#define __EXEC_OBJECT_INTERNAL_FLAGS (~0u << 28) /* all of the above */
#define __EXEC_OBJECT_RESERVED (__EXEC_OBJECT_HAS_PIN | __EXEC_OBJECT_HAS_FENCE)
#define __EXEC_HAS_RELOC BIT(31)
-#define __EXEC_VALIDATED BIT(30)
-#define __EXEC_INTERNAL_FLAGS (~0u << 30)
+#define __EXEC_INTERNAL_FLAGS (~0u << 31)
#define UPDATE PIN_OFFSET_FIXED
#define BATCH_OFFSET_BIAS (256*1024)
@@ -472,24 +470,17 @@ eb_validate_vma(struct i915_execbuffer *eb,
return 0;
}
-static int
+static void
eb_add_vma(struct i915_execbuffer *eb,
unsigned int i, unsigned batch_idx,
struct i915_vma *vma)
{
struct drm_i915_gem_exec_object2 *entry = &eb->exec[i];
struct eb_vma *ev = &eb->vma[i];
- int err;
GEM_BUG_ON(i915_vma_is_closed(vma));
- if (!(eb->args->flags & __EXEC_VALIDATED)) {
- err = eb_validate_vma(eb, entry, vma);
- if (unlikely(err))
- return err;
- }
-
- ev->vma = vma;
+ ev->vma = i915_vma_get(vma);
ev->exec = entry;
ev->flags = entry->flags;
@@ -522,7 +513,6 @@ eb_add_vma(struct i915_execbuffer *eb,
eb->batch = ev;
}
- err = 0;
if (eb_pin_vma(eb, entry, ev)) {
if (entry->offset != vma->node.start) {
entry->offset = vma->node.start | UPDATE;
@@ -530,12 +520,8 @@ eb_add_vma(struct i915_execbuffer *eb,
}
} else {
eb_unreserve_vma(ev);
-
list_add_tail(&ev->bind_link, &eb->unbound);
- if (drm_mm_node_allocated(&vma->node))
- err = i915_vma_unbind(vma);
}
- return err;
}
static inline int use_cpu_reloc(const struct reloc_cache *cache,
@@ -582,6 +568,13 @@ static int eb_reserve_vma(const struct i915_execbuffer *eb,
else if (exec_flags & __EXEC_OBJECT_NEEDS_BIAS)
pin_flags |= BATCH_OFFSET_BIAS | PIN_OFFSET_BIAS;
+ if (drm_mm_node_allocated(&vma->node) &&
+ eb_vma_misplaced(entry, vma, ev->flags)) {
+ err = i915_vma_unbind(vma);
+ if (err)
+ return err;
+ }
+
err = i915_vma_pin(vma,
entry->pad_to_size, entry->alignment,
pin_flags);
@@ -641,7 +634,7 @@ static int eb_reserve(struct i915_execbuffer *eb)
if (err)
break;
}
- if (err != -ENOSPC)
+ if (!(err == -ENOSPC || err == -EAGAIN))
return err;
/* Resort *all* the objects into priority order */
@@ -672,6 +665,11 @@ static int eb_reserve(struct i915_execbuffer *eb)
}
list_splice_tail(&last, &eb->unbound);
+ if (err == -EAGAIN) {
+ flush_workqueue(eb->i915->mm.userptr_wq);
+ continue;
+ }
+
switch (pass++) {
case 0:
break;
@@ -727,17 +725,14 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
unsigned int i, batch;
int err;
+ if (unlikely(i915_gem_context_is_closed(eb->gem_context)))
+ return -ENOENT;
+
INIT_LIST_HEAD(&eb->relocs);
INIT_LIST_HEAD(&eb->unbound);
batch = eb_batch_index(eb);
- mutex_lock(&eb->gem_context->mutex);
- if (unlikely(i915_gem_context_is_closed(eb->gem_context))) {
- err = -ENOENT;
- goto err_ctx;
- }
-
for (i = 0; i < eb->buffer_count; i++) {
u32 handle = eb->exec[i].handle;
struct i915_lut_handle *lut;
@@ -782,25 +777,19 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
i915_gem_object_unlock(obj);
add_vma:
- err = eb_add_vma(eb, i, batch, vma);
+ err = eb_validate_vma(eb, &eb->exec[i], vma);
if (unlikely(err))
goto err_vma;
- GEM_BUG_ON(drm_mm_node_allocated(&vma->node) &&
- eb_vma_misplaced(&eb->exec[i], vma, eb->vma[i].flags));
+ eb_add_vma(eb, i, batch, vma);
}
- mutex_unlock(&eb->gem_context->mutex);
-
- eb->args->flags |= __EXEC_VALIDATED;
- return eb_reserve(eb);
+ return 0;
err_obj:
i915_gem_object_put(obj);
err_vma:
eb->vma[i].vma = NULL;
-err_ctx:
- mutex_unlock(&eb->gem_context->mutex);
return err;
}
@@ -841,19 +830,10 @@ static void eb_release_vmas(const struct i915_execbuffer *eb)
if (ev->flags & __EXEC_OBJECT_HAS_PIN)
__eb_unreserve_vma(vma, ev->flags);
- if (ev->flags & __EXEC_OBJECT_HAS_REF)
- i915_vma_put(vma);
+ i915_vma_put(vma);
}
}
-static void eb_reset_vmas(const struct i915_execbuffer *eb)
-{
- eb_release_vmas(eb);
- if (eb->lut_size > 0)
- memset(eb->buckets, 0,
- sizeof(struct hlist_head) << eb->lut_size);
-}
-
static void eb_destroy(const struct i915_execbuffer *eb)
{
GEM_BUG_ON(eb->reloc_cache.rq);
@@ -1662,8 +1642,6 @@ static noinline int eb_relocate_slow(struct i915_execbuffer *eb)
goto out;
}
- /* We may process another execbuffer during the unlock... */
- eb_reset_vmas(eb);
mutex_unlock(&dev->struct_mutex);
/*
@@ -1702,11 +1680,6 @@ static noinline int eb_relocate_slow(struct i915_execbuffer *eb)
goto out;
}
- /* reacquire the objects */
- err = eb_lookup_vmas(eb);
- if (err)
- goto err;
-
GEM_BUG_ON(!eb->batch);
list_for_each_entry(ev, &eb->relocs, reloc_link) {
@@ -1757,8 +1730,17 @@ static noinline int eb_relocate_slow(struct i915_execbuffer *eb)
static int eb_relocate(struct i915_execbuffer *eb)
{
- if (eb_lookup_vmas(eb))
- goto slow;
+ int err;
+
+ mutex_lock(&eb->gem_context->mutex);
+ err = eb_lookup_vmas(eb);
+ mutex_unlock(&eb->gem_context->mutex);
+ if (err)
+ return err;
+
+ err = eb_reserve(eb);
+ if (err)
+ return err;
/* The objects are in their final locations, apply the relocations. */
if (eb->args->flags & __EXEC_HAS_RELOC) {
@@ -1766,14 +1748,11 @@ static int eb_relocate(struct i915_execbuffer *eb)
list_for_each_entry(ev, &eb->relocs, reloc_link) {
if (eb_relocate_vma(eb, ev))
- goto slow;
+ return eb_relocate_slow(eb);
}
}
return 0;
-
-slow:
- return eb_relocate_slow(eb);
}
static int eb_move_to_gpu(struct i915_execbuffer *eb)
@@ -1855,8 +1834,7 @@ static int eb_move_to_gpu(struct i915_execbuffer *eb)
i915_vma_unlock(vma);
__eb_unreserve_vma(vma, flags);
- if (unlikely(flags & __EXEC_OBJECT_HAS_REF))
- i915_vma_put(vma);
+ i915_vma_put(vma);
ev->vma = NULL;
}
@@ -2116,8 +2094,7 @@ static int eb_parse(struct i915_execbuffer *eb)
goto err_trampoline;
eb->vma[eb->buffer_count].vma = i915_vma_get(shadow);
- eb->vma[eb->buffer_count].flags =
- __EXEC_OBJECT_HAS_PIN | __EXEC_OBJECT_HAS_REF;
+ eb->vma[eb->buffer_count].flags = __EXEC_OBJECT_HAS_PIN;
eb->batch = &eb->vma[eb->buffer_count++];
eb->trampoline = trampoline;
--
2.25.1
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