[PATCH 18/22] drm/i915/gem: Include cmdparser in common execbuf pinning
Chris Wilson
chris at chris-wilson.co.uk
Wed Jul 1 19:35:59 UTC 2020
Pull the cmdparser allocations in to the reservation phase, and then
they are included in the common vma pinning pass.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
.../gpu/drm/i915/gem/i915_gem_execbuffer.c | 312 ++++++++++--------
1 file changed, 171 insertions(+), 141 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index d83456a038c8..38a59d77b80b 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -49,6 +49,7 @@ struct eb_vma {
struct eb_vma_array {
struct kref kref;
+ struct list_head aux_list;
struct eb_vma vma[];
};
@@ -243,7 +244,6 @@ struct i915_execbuffer {
struct i915_request *request; /** our request to build */
struct eb_vma *batch; /** identity of the batch obj/vma */
- struct i915_vma *trampoline; /** trampoline used for chaining */
/** actual size of execobj[] as we may extend it for the cmdparser */
unsigned int buffer_count;
@@ -278,6 +278,11 @@ struct i915_execbuffer {
unsigned int rq_size;
} reloc_cache;
+ struct eb_cmdparser {
+ struct eb_vma *shadow;
+ struct eb_vma *trampoline;
+ } parser;
+
u64 invalid_flags; /** Set of execobj.flags that are invalid */
u32 context_flags; /** Set of execobj.flags to insert from the ctx */
@@ -295,6 +300,8 @@ struct i915_execbuffer {
struct eb_vma_array *array;
};
+static struct drm_i915_gem_exec_object2 no_entry;
+
static inline bool eb_use_cmdparser(const struct i915_execbuffer *eb)
{
return intel_engine_requires_cmd_parser(eb->engine) ||
@@ -311,6 +318,7 @@ static struct eb_vma_array *eb_vma_array_create(unsigned int count)
return NULL;
kref_init(&arr->kref);
+ INIT_LIST_HEAD(&arr->aux_list);
arr->vma[0].vma = NULL;
return arr;
@@ -336,16 +344,31 @@ static inline void eb_unreserve_vma(struct eb_vma *ev)
__EXEC_OBJECT_HAS_FENCE);
}
+static void eb_vma_destroy(struct eb_vma *ev)
+{
+ eb_unreserve_vma(ev);
+ i915_vma_put(ev->vma);
+}
+
+static void eb_destroy_aux(struct eb_vma_array *arr)
+{
+ struct eb_vma *ev, *en;
+
+ list_for_each_entry_safe(ev, en, &arr->aux_list, reloc_link) {
+ eb_vma_destroy(ev);
+ kfree(ev);
+ }
+}
+
static void eb_vma_array_destroy(struct kref *kref)
{
struct eb_vma_array *arr = container_of(kref, typeof(*arr), kref);
- struct eb_vma *ev = arr->vma;
+ struct eb_vma *ev;
- while (ev->vma) {
- eb_unreserve_vma(ev);
- i915_vma_put(ev->vma);
- ev++;
- }
+ eb_destroy_aux(arr);
+
+ for (ev = arr->vma; ev->vma; ev++)
+ eb_vma_destroy(ev);
kvfree(arr);
}
@@ -393,8 +416,8 @@ eb_lock_vma(struct i915_execbuffer *eb, struct ww_acquire_ctx *acquire)
static int eb_create(struct i915_execbuffer *eb)
{
- /* Allocate an extra slot for use by the command parser + sentinel */
- eb->array = eb_vma_array_create(eb->buffer_count + 2);
+ /* Allocate an extra slot for use by the sentinel */
+ eb->array = eb_vma_array_create(eb->buffer_count + 1);
if (!eb->array)
return -ENOMEM;
@@ -1061,7 +1084,7 @@ static int eb_reserve_vma(struct eb_vm_work *work, struct eb_vma *ev)
GEM_BUG_ON(!(drm_mm_node_allocated(&vma->node) ^
drm_mm_node_allocated(&ev->hole)));
- if (entry->offset != vma->node.start) {
+ if (entry != &no_entry && entry->offset != vma->node.start) {
entry->offset = vma->node.start | UPDATE;
*work->p_flags |= __EXEC_HAS_RELOC;
}
@@ -1370,7 +1393,8 @@ static int eb_reserve_vm(struct i915_execbuffer *eb)
struct i915_vma *vma = ev->vma;
if (eb_pin_vma_inplace(eb, entry, ev)) {
- if (entry->offset != vma->node.start) {
+ if (entry != &no_entry &&
+ entry->offset != vma->node.start) {
entry->offset = vma->node.start | UPDATE;
eb->args->flags |= __EXEC_HAS_RELOC;
}
@@ -1495,6 +1519,112 @@ static int eb_reserve_vm(struct i915_execbuffer *eb)
} while (1);
}
+static int eb_alloc_cmdparser(struct i915_execbuffer *eb)
+{
+ struct intel_gt_buffer_pool_node *pool;
+ struct i915_vma *vma;
+ struct eb_vma *ev;
+ unsigned int len;
+ int err;
+
+ if (range_overflows_t(u64,
+ eb->batch_start_offset, eb->batch_len,
+ eb->batch->vma->size)) {
+ drm_dbg(&eb->i915->drm,
+ "Attempting to use out-of-bounds batch\n");
+ return -EINVAL;
+ }
+
+ if (eb->batch_len == 0)
+ eb->batch_len = eb->batch->vma->size - eb->batch_start_offset;
+
+ if (!eb_use_cmdparser(eb))
+ return 0;
+
+ len = eb->batch_len;
+ if (!CMDPARSER_USES_GGTT(eb->i915)) {
+ /*
+ * ppGTT backed shadow buffers must be mapped RO, to prevent
+ * post-scan tampering
+ */
+ if (!eb->context->vm->has_read_only) {
+ drm_dbg(&eb->i915->drm,
+ "Cannot prevent post-scan tampering without RO capable vm\n");
+ return -EINVAL;
+ }
+ } else {
+ len += I915_CMD_PARSER_TRAMPOLINE_SIZE;
+ }
+
+ pool = intel_gt_get_buffer_pool(eb->engine->gt, len);
+ if (IS_ERR(pool))
+ return PTR_ERR(pool);
+
+ ev = kzalloc(sizeof(*ev), GFP_KERNEL);
+ if (!ev) {
+ err = -ENOMEM;
+ goto err_pool;
+ }
+
+ vma = i915_vma_instance(pool->obj, eb->context->vm, NULL);
+ if (IS_ERR(vma)) {
+ err = PTR_ERR(vma);
+ goto err_pool;
+ }
+ i915_gem_object_set_readonly(vma->obj);
+ vma->private = pool;
+
+ ev->vma = i915_vma_get(vma);
+ ev->exec = &no_entry;
+ list_add(&ev->reloc_link, &eb->array->aux_list);
+ list_add(&ev->bind_link, &eb->bind_list);
+ list_add(&ev->submit_link, &eb->submit_list);
+
+ if (CMDPARSER_USES_GGTT(eb->i915)) {
+ eb->parser.trampoline = ev;
+
+ /*
+ * Special care when binding will be required for full-ppgtt
+ * as there will be distinct vm involved, and we will need to
+ * separate the binding/eviction passes (different vm->mutex).
+ */
+ if (GEM_WARN_ON(eb->context->vm != &eb->engine->gt->ggtt->vm)) {
+ ev = kzalloc(sizeof(*ev), GFP_KERNEL);
+ if (!ev) {
+ err = -ENOMEM;
+ goto err_pool;
+ }
+
+ vma = i915_vma_instance(pool->obj,
+ &eb->engine->gt->ggtt->vm,
+ NULL);
+ if (IS_ERR(vma)) {
+ err = PTR_ERR(vma);
+ goto err_ev;
+ }
+ vma->private = pool;
+
+ ev->vma = i915_vma_get(vma);
+ ev->exec = &no_entry;
+ list_add(&ev->reloc_link, &eb->array->aux_list);
+ list_add(&ev->bind_link, &eb->bind_list);
+ list_add(&ev->submit_link, &eb->submit_list);
+ }
+
+ ev->flags = EXEC_OBJECT_NEEDS_GTT;
+ eb->batch_flags |= I915_DISPATCH_SECURE;
+ }
+
+ eb->parser.shadow = ev;
+ return 0;
+
+err_ev:
+ kfree(ev);
+err_pool:
+ intel_gt_buffer_pool_put(pool);
+ return err;
+}
+
static unsigned int eb_batch_index(const struct i915_execbuffer *eb)
{
if (eb->args->flags & I915_EXEC_BATCH_FIRST)
@@ -2280,6 +2410,10 @@ static int eb_relocate(struct i915_execbuffer *eb)
if (err)
return err;
+ err = eb_alloc_cmdparser(eb);
+ if (err)
+ return err;
+
err = eb_reserve_vm(eb);
if (err)
return err;
@@ -2364,8 +2498,6 @@ static int eb_move_to_gpu(struct i915_execbuffer *eb)
}
ww_acquire_fini(&acquire);
- eb_vma_array_put(fetch_and_zero(&eb->array));
-
if (unlikely(err))
goto err_skip;
@@ -2429,25 +2561,6 @@ static int i915_reset_gen7_sol_offsets(struct i915_request *rq)
return 0;
}
-static struct i915_vma *
-shadow_batch_pin(struct drm_i915_gem_object *obj,
- struct i915_address_space *vm,
- unsigned int flags)
-{
- struct i915_vma *vma;
- int err;
-
- vma = i915_vma_instance(obj, vm, NULL);
- if (IS_ERR(vma))
- return vma;
-
- err = i915_vma_pin(vma, 0, 0, flags);
- if (err)
- return ERR_PTR(err);
-
- return vma;
-}
-
struct eb_parse_work {
struct dma_fence_work base;
struct intel_engine_cs *engine;
@@ -2499,19 +2612,10 @@ __parser_mark_active(struct i915_vma *vma,
static int
parser_mark_active(struct eb_parse_work *pw, struct intel_timeline *tl)
{
- int err;
+ GEM_BUG_ON(pw->trampoline &&
+ pw->trampoline->private != pw->shadow->private);
- err = __parser_mark_active(pw->shadow, tl, &pw->base.dma);
- if (err)
- return err;
-
- if (pw->trampoline) {
- err = __parser_mark_active(pw->trampoline, tl, &pw->base.dma);
- if (err)
- return err;
- }
-
- return 0;
+ return __parser_mark_active(pw->shadow, tl, &pw->base.dma);
}
static int eb_parse_pipeline(struct i915_execbuffer *eb,
@@ -2521,6 +2625,9 @@ static int eb_parse_pipeline(struct i915_execbuffer *eb,
struct eb_parse_work *pw;
int err;
+ GEM_BUG_ON(!i915_vma_is_pinned(shadow));
+ GEM_BUG_ON(trampoline && !i915_vma_is_pinned(trampoline));
+
pw = kzalloc(sizeof(*pw), GFP_KERNEL);
if (!pw)
return -ENOMEM;
@@ -2599,82 +2706,26 @@ static int eb_parse_pipeline(struct i915_execbuffer *eb,
static int eb_parse(struct i915_execbuffer *eb)
{
- struct drm_i915_private *i915 = eb->i915;
- struct intel_gt_buffer_pool_node *pool;
- struct i915_vma *shadow, *trampoline;
- unsigned int len;
int err;
- if (!eb_use_cmdparser(eb))
- return 0;
-
- len = eb->batch_len;
- if (!CMDPARSER_USES_GGTT(eb->i915)) {
- /*
- * ppGTT backed shadow buffers must be mapped RO, to prevent
- * post-scan tampering
- */
- if (!eb->context->vm->has_read_only) {
- drm_dbg(&i915->drm,
- "Cannot prevent post-scan tampering without RO capable vm\n");
- return -EINVAL;
- }
- } else {
- len += I915_CMD_PARSER_TRAMPOLINE_SIZE;
- }
-
- pool = intel_gt_get_buffer_pool(eb->engine->gt, len);
- if (IS_ERR(pool))
- return PTR_ERR(pool);
-
- shadow = shadow_batch_pin(pool->obj, eb->context->vm, PIN_USER);
- if (IS_ERR(shadow)) {
- err = PTR_ERR(shadow);
- goto err;
+ if (unlikely(eb->batch->flags & EXEC_OBJECT_WRITE)) {
+ drm_dbg(&eb->i915->drm,
+ "Attempting to use self-modifying batch buffer\n");
+ return -EINVAL;
}
- i915_gem_object_set_readonly(shadow->obj);
- shadow->private = pool;
- trampoline = NULL;
- if (CMDPARSER_USES_GGTT(eb->i915)) {
- trampoline = shadow;
-
- shadow = shadow_batch_pin(pool->obj,
- &eb->engine->gt->ggtt->vm,
- PIN_GLOBAL);
- if (IS_ERR(shadow)) {
- err = PTR_ERR(shadow);
- shadow = trampoline;
- goto err_shadow;
- }
- shadow->private = pool;
-
- eb->batch_flags |= I915_DISPATCH_SECURE;
- }
+ if (!eb->parser.shadow)
+ return 0;
- err = eb_parse_pipeline(eb, shadow, trampoline);
+ err = eb_parse_pipeline(eb,
+ eb->parser.shadow->vma,
+ eb->parser.trampoline ? eb->parser.trampoline->vma : NULL);
if (err)
- goto err_trampoline;
-
- eb->batch = &eb->vma[eb->buffer_count++];
- eb->batch->vma = i915_vma_get(shadow);
- eb->batch->flags = __EXEC_OBJECT_HAS_PIN;
- list_add_tail(&eb->batch->submit_link, &eb->submit_list);
- eb->vma[eb->buffer_count].vma = NULL;
+ return err;
- eb->trampoline = trampoline;
+ eb->batch = eb->parser.shadow;
eb->batch_start_offset = 0;
-
return 0;
-
-err_trampoline:
- if (trampoline)
- i915_vma_unpin(trampoline);
-err_shadow:
- i915_vma_unpin(shadow);
-err:
- intel_gt_buffer_pool_put(pool);
- return err;
}
static void
@@ -2723,10 +2774,10 @@ static int eb_submit(struct i915_execbuffer *eb, struct i915_vma *batch)
if (err)
return err;
- if (eb->trampoline) {
+ if (eb->parser.trampoline) {
GEM_BUG_ON(eb->batch_start_offset);
err = eb->engine->emit_bb_start(eb->request,
- eb->trampoline->node.start +
+ eb->parser.trampoline->vma->node.start +
eb->batch_len,
0, 0);
if (err)
@@ -3211,7 +3262,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
eb.buffer_count = args->buffer_count;
eb.batch_start_offset = args->batch_start_offset;
eb.batch_len = args->batch_len;
- eb.trampoline = NULL;
+ memset(&eb.parser, 0, sizeof(eb.parser));
eb.batch_flags = 0;
if (args->flags & I915_EXEC_SECURE) {
@@ -3277,24 +3328,6 @@ i915_gem_do_execbuffer(struct drm_device *dev,
goto err_vma;
}
- if (unlikely(eb.batch->flags & EXEC_OBJECT_WRITE)) {
- drm_dbg(&i915->drm,
- "Attempting to use self-modifying batch buffer\n");
- err = -EINVAL;
- goto err_vma;
- }
-
- if (range_overflows_t(u64,
- eb.batch_start_offset, eb.batch_len,
- eb.batch->vma->size)) {
- drm_dbg(&i915->drm, "Attempting to use out-of-bounds batch\n");
- err = -EINVAL;
- goto err_vma;
- }
-
- if (eb.batch_len == 0)
- eb.batch_len = eb.batch->vma->size - eb.batch_start_offset;
-
err = eb_parse(&eb);
if (err)
goto err_vma;
@@ -3320,7 +3353,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
vma = i915_gem_object_ggtt_pin(batch->obj, NULL, 0, 0, 0);
if (IS_ERR(vma)) {
err = PTR_ERR(vma);
- goto err_parse;
+ goto err_vma;
}
GEM_BUG_ON(vma->obj != batch->obj);
@@ -3372,8 +3405,9 @@ i915_gem_do_execbuffer(struct drm_device *dev,
* to explicitly hold another reference here.
*/
eb.request->batch = batch;
- if (batch->private)
- intel_gt_buffer_pool_mark_active(batch->private, eb.request);
+ if (eb.parser.shadow)
+ intel_gt_buffer_pool_mark_active(eb.parser.shadow->vma->private,
+ eb.request);
trace_i915_request_queue(eb.request, eb.batch_flags);
err = eb_submit(&eb, batch);
@@ -3400,13 +3434,9 @@ i915_gem_do_execbuffer(struct drm_device *dev,
err_batch_unpin:
if (eb.batch_flags & I915_DISPATCH_SECURE)
i915_vma_unpin(batch);
-err_parse:
- if (batch->private)
- intel_gt_buffer_pool_put(batch->private);
- i915_vma_put(batch);
err_vma:
- if (eb.trampoline)
- i915_vma_unpin(eb.trampoline);
+ if (eb.parser.shadow)
+ intel_gt_buffer_pool_put(eb.parser.shadow->vma->private);
eb_unpin_engine(&eb);
err_context:
i915_gem_context_put(eb.gem_context);
--
2.20.1
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