On Wed, Oct 13, 2021 at 05:55:51PM -0700, John Harrison wrote:
> On 10/13/2021 13:42, Matthew Brost wrote:
> > Allow multiple batch buffers to be submitted in a single execbuf IOCTL
> > after a context has been configured with the 'set_parallel' extension.
> > The number batches is implicit based on the contexts configuration.
> >
> > This is implemented with a series of loops. First a loop is used to find
> > all the batches, a loop to pin all the HW contexts, a loop to create all
> > the requests, a loop to submit (emit BB start, etc...) all the requests,
> > a loop to tie the requests to the VMAs they touch, and finally a loop to
> > commit the requests to the backend.
> >
> > A composite fence is also created for the generated requests to return
> > to the user and to stick in dma resv slots.
> >
> > No behavior from the existing IOCTL should be changed aside from when
> > throttling because the ring for a context is full. In this situation,
> > i915 will now wait while holding the object locks. This change was done
> > because the code is much simpler to wait while holding the locks and we
> > believe there isn't a huge benefit of dropping these locks. If this
> > proves false we can restructure the code to drop the locks during the
> > wait.
> >
> > IGT: https://patchwork.freedesktop.org/patch/447008/?series=93071&rev=1
> > media UMD: https://github.com/intel/media-driver/pull/1252
> >
> > v2:
> > (Matthew Brost)
> > - Return proper error value if i915_request_create fails
> > v3:
> > (John Harrison)
> > - Add comment explaining create / add order loops + locking
> > - Update commit message explaining different in IOCTL behavior
> > - Line wrap some comments
> > - eb_add_request returns void
> > - Return -EINVAL rather triggering BUG_ON if cmd parser used
> > (Checkpatch)
> > - Check eb->batch_len[*current_batch]
> > v4:
> > (CI)
> > - Set batch len if passed if via execbuf args
> > - Call __i915_request_skip after __i915_request_commit
> > (Kernel test robot)
> > - Initialize rq to NULL in eb_pin_timeline
> >
> > Signed-off-by: Matthew Brost <matthew.br...@intel.com>
> > ---
> > .../gpu/drm/i915/gem/i915_gem_execbuffer.c | 783 ++++++++++++------
> > drivers/gpu/drm/i915/gt/intel_context.h | 8 +-
> > drivers/gpu/drm/i915/gt/intel_context_types.h | 10 +
> > .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 2 +
> > drivers/gpu/drm/i915/i915_request.h | 9 +
> > drivers/gpu/drm/i915/i915_vma.c | 21 +-
> > drivers/gpu/drm/i915/i915_vma.h | 13 +-
> > 7 files changed, 595 insertions(+), 251 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> > b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> > index c75afc8784e3..6509c9d8c298 100644
> > --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> > +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> > @@ -246,17 +246,25 @@ struct i915_execbuffer {
> > struct drm_i915_gem_exec_object2 *exec; /** ioctl execobj[] */
> > struct eb_vma *vma;
> > - struct intel_engine_cs *engine; /** engine to queue the request to */
> > + struct intel_gt *gt; /* gt for the execbuf */
> > struct intel_context *context; /* logical state for the request */
> > struct i915_gem_context *gem_context; /** caller's context */
> > - struct i915_request *request; /** our request to build */
> > - struct eb_vma *batch; /** identity of the batch obj/vma */
> > + /** our requests to build */
> > + struct i915_request *requests[MAX_ENGINE_INSTANCE + 1];
> > + /** identity of the batch obj/vma */
> > + struct eb_vma *batches[MAX_ENGINE_INSTANCE + 1];
> > struct i915_vma *trampoline; /** trampoline used for chaining */
> > + /** used for excl fence in dma_resv objects when > 1 BB submitted */
> > + struct dma_fence *composite_fence;
> > +
> > /** actual size of execobj[] as we may extend it for the cmdparser */
> > unsigned int buffer_count;
> > + /* number of batches in execbuf IOCTL */
> > + unsigned int num_batches;
> > +
> > /** list of vma not yet bound during reservation phase */
> > struct list_head unbound;
> > @@ -283,7 +291,8 @@ struct i915_execbuffer {
> > u64 invalid_flags; /** Set of execobj.flags that are invalid */
> > - u64 batch_len; /** Length of batch within object */
> > + /** Length of batch within object */
> > + u64 batch_len[MAX_ENGINE_INSTANCE + 1];
> > u32 batch_start_offset; /** Location within object of batch */
> > u32 batch_flags; /** Flags composed for emit_bb_start() */
> > struct intel_gt_buffer_pool_node *batch_pool; /** pool node for batch
> > buffer */
> > @@ -301,14 +310,13 @@ struct i915_execbuffer {
> > };
> > static int eb_parse(struct i915_execbuffer *eb);
> > -static struct i915_request *eb_pin_engine(struct i915_execbuffer *eb,
> > - bool throttle);
> > +static int eb_pin_engine(struct i915_execbuffer *eb, bool throttle);
> > static void eb_unpin_engine(struct i915_execbuffer *eb);
> > static inline bool eb_use_cmdparser(const struct i915_execbuffer *eb)
> > {
> > - return intel_engine_requires_cmd_parser(eb->engine) ||
> > - (intel_engine_using_cmd_parser(eb->engine) &&
> > + return intel_engine_requires_cmd_parser(eb->context->engine) ||
> > + (intel_engine_using_cmd_parser(eb->context->engine) &&
> > eb->args->batch_len);
> > }
> > @@ -546,11 +554,21 @@ eb_validate_vma(struct i915_execbuffer *eb,
> > return 0;
> > }
> > -static void
> > +static inline bool
> > +is_batch_buffer(struct i915_execbuffer *eb, unsigned int buffer_idx)
> > +{
> > + return eb->args->flags & I915_EXEC_BATCH_FIRST ?
> > + buffer_idx < eb->num_batches :
> > + buffer_idx >= eb->args->buffer_count - eb->num_batches;
> > +}
> > +
> > +static int
> > eb_add_vma(struct i915_execbuffer *eb,
> > - unsigned int i, unsigned batch_idx,
> > + unsigned int *current_batch,
> > + unsigned int i,
> > struct i915_vma *vma)
> > {
> > + struct drm_i915_private *i915 = eb->i915;
> > struct drm_i915_gem_exec_object2 *entry = &eb->exec[i];
> > struct eb_vma *ev = &eb->vma[i];
> > @@ -577,15 +595,43 @@ eb_add_vma(struct i915_execbuffer *eb,
> > * Note that actual hangs have only been observed on gen7, but for
> > * paranoia do it everywhere.
> > */
> > - if (i == batch_idx) {
> > + if (is_batch_buffer(eb, i)) {
> > if (entry->relocation_count &&
> > !(ev->flags & EXEC_OBJECT_PINNED))
> > ev->flags |= __EXEC_OBJECT_NEEDS_BIAS;
> > if (eb->reloc_cache.has_fence)
> > ev->flags |= EXEC_OBJECT_NEEDS_FENCE;
> > - eb->batch = ev;
> > + eb->batches[*current_batch] = ev;
> > +
> > + if (unlikely(ev->flags & EXEC_OBJECT_WRITE)) {
> > + drm_dbg(&i915->drm,
> > + "Attempting to use self-modifying batch
> > buffer\n");
> > + return -EINVAL;
> > + }
> > +
> > + if (range_overflows_t(u64,
> > + eb->batch_start_offset,
> > + eb->args->batch_len,
> > + ev->vma->size)) {
> > + drm_dbg(&i915->drm, "Attempting to use out-of-bounds
> > batch\n");
> > + return -EINVAL;
> > + }
> > +
> > + if (eb->args->batch_len == 0)
> > + eb->batch_len[*current_batch] = ev->vma->size -
> > + eb->batch_start_offset;
> > + else
> > + eb->batch_len[*current_batch] = eb->args->batch_len;
> > + if (unlikely(eb->batch_len[*current_batch] == 0)) { /*
> > impossible! */
> > + drm_dbg(&i915->drm, "Invalid batch length\n");
> > + return -EINVAL;
> > + }
> > +
> > + ++*current_batch;
> > }
> > +
> > + return 0;
> > }
> > static inline int use_cpu_reloc(const struct reloc_cache *cache,
> > @@ -729,14 +775,6 @@ static int eb_reserve(struct i915_execbuffer *eb)
> > } while (1);
> > }
> > -static unsigned int eb_batch_index(const struct i915_execbuffer *eb)
> > -{
> > - if (eb->args->flags & I915_EXEC_BATCH_FIRST)
> > - return 0;
> > - else
> > - return eb->buffer_count - 1;
> > -}
> > -
> > static int eb_select_context(struct i915_execbuffer *eb)
> > {
> > struct i915_gem_context *ctx;
> > @@ -857,9 +895,7 @@ static struct i915_vma *eb_lookup_vma(struct
> > i915_execbuffer *eb, u32 handle)
> > static int eb_lookup_vmas(struct i915_execbuffer *eb)
> > {
> > - struct drm_i915_private *i915 = eb->i915;
> > - unsigned int batch = eb_batch_index(eb);
> > - unsigned int i;
> > + unsigned int i, current_batch = 0;
> > int err = 0;
> > INIT_LIST_HEAD(&eb->relocs);
> > @@ -879,7 +915,9 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
> > goto err;
> > }
> > - eb_add_vma(eb, i, batch, vma);
> > + err = eb_add_vma(eb, ¤t_batch, i, vma);
> > + if (err)
> > + return err;
> > if (i915_gem_object_is_userptr(vma->obj)) {
> > err = i915_gem_object_userptr_submit_init(vma->obj);
> > @@ -902,26 +940,6 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
> > }
> > }
> > - if (unlikely(eb->batch->flags & EXEC_OBJECT_WRITE)) {
> > - drm_dbg(&i915->drm,
> > - "Attempting to use self-modifying batch buffer\n");
> > - return -EINVAL;
> > - }
> > -
> > - 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");
> > - return -EINVAL;
> > - }
> > -
> > - if (eb->batch_len == 0)
> > - eb->batch_len = eb->batch->vma->size - eb->batch_start_offset;
> > - if (unlikely(eb->batch_len == 0)) { /* impossible! */
> > - drm_dbg(&i915->drm, "Invalid batch length\n");
> > - return -EINVAL;
> > - }
> > -
> > return 0;
> > err:
> > @@ -1654,8 +1672,7 @@ static int eb_reinit_userptr(struct i915_execbuffer
> > *eb)
> > return 0;
> > }
> > -static noinline int eb_relocate_parse_slow(struct i915_execbuffer *eb,
> > - struct i915_request *rq)
> > +static noinline int eb_relocate_parse_slow(struct i915_execbuffer *eb)
> > {
> > bool have_copy = false;
> > struct eb_vma *ev;
> > @@ -1671,21 +1688,6 @@ static noinline int eb_relocate_parse_slow(struct
> > i915_execbuffer *eb,
> > eb_release_vmas(eb, false);
> > i915_gem_ww_ctx_fini(&eb->ww);
> > - if (rq) {
> > - /* nonblocking is always false */
> > - if (i915_request_wait(rq, I915_WAIT_INTERRUPTIBLE,
> > - MAX_SCHEDULE_TIMEOUT) < 0) {
> > - i915_request_put(rq);
> > - rq = NULL;
> > -
> > - err = -EINTR;
> > - goto err_relock;
> > - }
> > -
> > - i915_request_put(rq);
> > - rq = NULL;
> > - }
> > -
> > /*
> > * We take 3 passes through the slowpatch.
> > *
> > @@ -1712,28 +1714,21 @@ static noinline int eb_relocate_parse_slow(struct
> > i915_execbuffer *eb,
> > if (!err)
> > err = eb_reinit_userptr(eb);
> > -err_relock:
> > i915_gem_ww_ctx_init(&eb->ww, true);
> > if (err)
> > goto out;
> > /* reacquire the objects */
> > repeat_validate:
> > - rq = eb_pin_engine(eb, false);
> > - if (IS_ERR(rq)) {
> > - err = PTR_ERR(rq);
> > - rq = NULL;
> > + err = eb_pin_engine(eb, false);
> > + if (err)
> > goto err;
> > - }
> > -
> > - /* We didn't throttle, should be NULL */
> > - GEM_WARN_ON(rq);
> > err = eb_validate_vmas(eb);
> > if (err)
> > goto err;
> > - GEM_BUG_ON(!eb->batch);
> > + GEM_BUG_ON(!eb->batches[0]);
> > list_for_each_entry(ev, &eb->relocs, reloc_link) {
> > if (!have_copy) {
> > @@ -1797,46 +1792,23 @@ static noinline int eb_relocate_parse_slow(struct
> > i915_execbuffer *eb,
> > }
> > }
> > - if (rq)
> > - i915_request_put(rq);
> > -
> > return err;
> > }
> > static int eb_relocate_parse(struct i915_execbuffer *eb)
> > {
> > int err;
> > - struct i915_request *rq = NULL;
> > bool throttle = true;
> > retry:
> > - rq = eb_pin_engine(eb, throttle);
> > - if (IS_ERR(rq)) {
> > - err = PTR_ERR(rq);
> > - rq = NULL;
> > + err = eb_pin_engine(eb, throttle);
> > + if (err) {
> > if (err != -EDEADLK)
> > return err;
> > goto err;
> > }
> > - if (rq) {
> > - bool nonblock = eb->file->filp->f_flags & O_NONBLOCK;
> > -
> > - /* Need to drop all locks now for throttling, take slowpath */
> > - err = i915_request_wait(rq, I915_WAIT_INTERRUPTIBLE, 0);
> > - if (err == -ETIME) {
> > - if (nonblock) {
> > - err = -EWOULDBLOCK;
> > - i915_request_put(rq);
> > - goto err;
> > - }
> > - goto slow;
> > - }
> > - i915_request_put(rq);
> > - rq = NULL;
> > - }
> > -
> > /* only throttle once, even if we didn't need to throttle */
> > throttle = false;
> > @@ -1876,7 +1848,7 @@ static int eb_relocate_parse(struct i915_execbuffer
> > *eb)
> > return err;
> > slow:
> > - err = eb_relocate_parse_slow(eb, rq);
> > + err = eb_relocate_parse_slow(eb);
> > if (err)
> > /*
> > * If the user expects the execobject.offset and
> > @@ -1890,11 +1862,40 @@ static int eb_relocate_parse(struct i915_execbuffer
> > *eb)
> > return err;
> > }
> > +/*
> > + * Using two helper loops for the order of which requests / batches are
> > created
> > + * and added the to backend. Requests are created in order from the parent
> > to
> > + * the last child. Requests are add in the reverse order, from the last
> > child to
> are add -> are added
>
Yep.
> > + * parent. This is down from locking reasons as the timeline lock is
> > acquired
> down from -> done for?
>
And yep. Will fix.
Matt
> John.
>
> > + * during request creation and released when the request is added to the
> > + * backend. To make lockdep happy (see intel_context_timeline_lock) this
> > must be
> > + * the ordering.
> > + */
> > +#define for_each_batch_create_order(_eb, _i) \
> > + for ((_i) = 0; (_i) < (_eb)->num_batches; ++(_i))
> > +#define for_each_batch_add_order(_eb, _i) \
> > + BUILD_BUG_ON(!typecheck(int, _i)); \
> > + for ((_i) = (_eb)->num_batches - 1; (_i) >= 0; --(_i))
> > +
> > +static struct i915_request *
> > +eb_find_first_request_added(struct i915_execbuffer *eb)
> > +{
> > + int i;
> > +
> > + for_each_batch_add_order(eb, i)
> > + if (eb->requests[i])
> > + return eb->requests[i];
> > +
> > + GEM_BUG_ON("Request not found");
> > +
> > + return NULL;
> > +}
> > +
> > static int eb_move_to_gpu(struct i915_execbuffer *eb)
> > {
> > const unsigned int count = eb->buffer_count;
> > unsigned int i = count;
> > - int err = 0;
> > + int err = 0, j;
> > while (i--) {
> > struct eb_vma *ev = &eb->vma[i];
> > @@ -1907,11 +1908,17 @@ static int eb_move_to_gpu(struct i915_execbuffer
> > *eb)
> > if (flags & EXEC_OBJECT_CAPTURE) {
> > struct i915_capture_list *capture;
> > - capture = kmalloc(sizeof(*capture), GFP_KERNEL);
> > - if (capture) {
> > - capture->next = eb->request->capture_list;
> > - capture->vma = vma;
> > - eb->request->capture_list = capture;
> > + for_each_batch_create_order(eb, j) {
> > + if (!eb->requests[j])
> > + break;
> > +
> > + capture = kmalloc(sizeof(*capture), GFP_KERNEL);
> > + if (capture) {
> > + capture->next =
> > + eb->requests[j]->capture_list;
> > + capture->vma = vma;
> > + eb->requests[j]->capture_list = capture;
> > + }
> > }
> > }
> > @@ -1932,14 +1939,26 @@ static int eb_move_to_gpu(struct i915_execbuffer
> > *eb)
> > flags &= ~EXEC_OBJECT_ASYNC;
> > }
> > + /* We only need to await on the first request */
> > if (err == 0 && !(flags & EXEC_OBJECT_ASYNC)) {
> > err = i915_request_await_object
> > - (eb->request, obj, flags & EXEC_OBJECT_WRITE);
> > + (eb_find_first_request_added(eb), obj,
> > + flags & EXEC_OBJECT_WRITE);
> > }
> > - if (err == 0)
> > - err = i915_vma_move_to_active(vma, eb->request,
> > - flags |
> > __EXEC_OBJECT_NO_RESERVE);
> > + for_each_batch_add_order(eb, j) {
> > + if (err)
> > + break;
> > + if (!eb->requests[j])
> > + continue;
> > +
> > + err = _i915_vma_move_to_active(vma, eb->requests[j],
> > + j ? NULL :
> > + eb->composite_fence ?
> > + eb->composite_fence :
> > + &eb->requests[j]->fence,
> > + flags |
> > __EXEC_OBJECT_NO_RESERVE);
> > + }
> > }
> > #ifdef CONFIG_MMU_NOTIFIER
> > @@ -1970,11 +1989,16 @@ static int eb_move_to_gpu(struct i915_execbuffer
> > *eb)
> > goto err_skip;
> > /* Unconditionally flush any chipset caches (for streaming writes). */
> > - intel_gt_chipset_flush(eb->engine->gt);
> > + intel_gt_chipset_flush(eb->gt);
> > return 0;
> > err_skip:
> > - i915_request_set_error_once(eb->request, err);
> > + for_each_batch_create_order(eb, j) {
> > + if (!eb->requests[j])
> > + break;
> > +
> > + i915_request_set_error_once(eb->requests[j], err);
> > + }
> > return err;
> > }
> > @@ -2069,14 +2093,17 @@ static int eb_parse(struct i915_execbuffer *eb)
> > int err;
> > if (!eb_use_cmdparser(eb)) {
> > - batch = eb_dispatch_secure(eb, eb->batch->vma);
> > + batch = eb_dispatch_secure(eb, eb->batches[0]->vma);
> > if (IS_ERR(batch))
> > return PTR_ERR(batch);
> > goto secure_batch;
> > }
> > - len = eb->batch_len;
> > + if (intel_context_is_parallel(eb->context))
> > + return -EINVAL;
> > +
> > + len = eb->batch_len[0];
> > if (!CMDPARSER_USES_GGTT(eb->i915)) {
> > /*
> > * ppGTT backed shadow buffers must be mapped RO, to prevent
> > @@ -2090,11 +2117,11 @@ static int eb_parse(struct i915_execbuffer *eb)
> > } else {
> > len += I915_CMD_PARSER_TRAMPOLINE_SIZE;
> > }
> > - if (unlikely(len < eb->batch_len)) /* last paranoid check of overflow */
> > + if (unlikely(len < eb->batch_len[0])) /* last paranoid check of
> > overflow */
> > return -EINVAL;
> > if (!pool) {
> > - pool = intel_gt_get_buffer_pool(eb->engine->gt, len,
> > + pool = intel_gt_get_buffer_pool(eb->gt, len,
> > I915_MAP_WB);
> > if (IS_ERR(pool))
> > return PTR_ERR(pool);
> > @@ -2119,7 +2146,7 @@ static int eb_parse(struct i915_execbuffer *eb)
> > trampoline = shadow;
> > shadow = shadow_batch_pin(eb, pool->obj,
> > - &eb->engine->gt->ggtt->vm,
> > + &eb->gt->ggtt->vm,
> > PIN_GLOBAL);
> > if (IS_ERR(shadow)) {
> > err = PTR_ERR(shadow);
> > @@ -2141,26 +2168,29 @@ static int eb_parse(struct i915_execbuffer *eb)
> > if (err)
> > goto err_trampoline;
> > - err = intel_engine_cmd_parser(eb->engine,
> > - eb->batch->vma,
> > + err = intel_engine_cmd_parser(eb->context->engine,
> > + eb->batches[0]->vma,
> > eb->batch_start_offset,
> > - eb->batch_len,
> > + eb->batch_len[0],
> > shadow, trampoline);
> > if (err)
> > goto err_unpin_batch;
> > - eb->batch = &eb->vma[eb->buffer_count++];
> > - eb->batch->vma = i915_vma_get(shadow);
> > - eb->batch->flags = __EXEC_OBJECT_HAS_PIN;
> > + eb->batches[0] = &eb->vma[eb->buffer_count++];
> > + eb->batches[0]->vma = i915_vma_get(shadow);
> > + eb->batches[0]->flags = __EXEC_OBJECT_HAS_PIN;
> > eb->trampoline = trampoline;
> > eb->batch_start_offset = 0;
> > secure_batch:
> > if (batch) {
> > - eb->batch = &eb->vma[eb->buffer_count++];
> > - eb->batch->flags = __EXEC_OBJECT_HAS_PIN;
> > - eb->batch->vma = i915_vma_get(batch);
> > + if (intel_context_is_parallel(eb->context))
> > + return -EINVAL;
> > +
> > + eb->batches[0] = &eb->vma[eb->buffer_count++];
> > + eb->batches[0]->flags = __EXEC_OBJECT_HAS_PIN;
> > + eb->batches[0]->vma = i915_vma_get(batch);
> > }
> > return 0;
> > @@ -2176,19 +2206,18 @@ static int eb_parse(struct i915_execbuffer *eb)
> > return err;
> > }
> > -static int eb_submit(struct i915_execbuffer *eb, struct i915_vma *batch)
> > +static int eb_request_submit(struct i915_execbuffer *eb,
> > + struct i915_request *rq,
> > + struct i915_vma *batch,
> > + u64 batch_len)
> > {
> > int err;
> > - if (intel_context_nopreempt(eb->context))
> > - __set_bit(I915_FENCE_FLAG_NOPREEMPT, &eb->request->fence.flags);
> > -
> > - err = eb_move_to_gpu(eb);
> > - if (err)
> > - return err;
> > + if (intel_context_nopreempt(rq->context))
> > + __set_bit(I915_FENCE_FLAG_NOPREEMPT, &rq->fence.flags);
> > if (eb->args->flags & I915_EXEC_GEN7_SOL_RESET) {
> > - err = i915_reset_gen7_sol_offsets(eb->request);
> > + err = i915_reset_gen7_sol_offsets(rq);
> > if (err)
> > return err;
> > }
> > @@ -2199,26 +2228,26 @@ static int eb_submit(struct i915_execbuffer *eb,
> > struct i915_vma *batch)
> > * allows us to determine if the batch is still waiting on the GPU
> > * or actually running by checking the breadcrumb.
> > */
> > - if (eb->engine->emit_init_breadcrumb) {
> > - err = eb->engine->emit_init_breadcrumb(eb->request);
> > + if (rq->context->engine->emit_init_breadcrumb) {
> > + err = rq->context->engine->emit_init_breadcrumb(rq);
> > if (err)
> > return err;
> > }
> > - err = eb->engine->emit_bb_start(eb->request,
> > - batch->node.start +
> > - eb->batch_start_offset,
> > - eb->batch_len,
> > - eb->batch_flags);
> > + err = rq->context->engine->emit_bb_start(rq,
> > + batch->node.start +
> > + eb->batch_start_offset,
> > + batch_len,
> > + eb->batch_flags);
> > if (err)
> > return err;
> > if (eb->trampoline) {
> > + GEM_BUG_ON(intel_context_is_parallel(rq->context));
> > GEM_BUG_ON(eb->batch_start_offset);
> > - err = eb->engine->emit_bb_start(eb->request,
> > - eb->trampoline->node.start +
> > - eb->batch_len,
> > - 0, 0);
> > + err = rq->context->engine->emit_bb_start(rq,
> > +
> > eb->trampoline->node.start +
> > + batch_len, 0, 0);
> > if (err)
> > return err;
> > }
> > @@ -2226,6 +2255,27 @@ static int eb_submit(struct i915_execbuffer *eb,
> > struct i915_vma *batch)
> > return 0;
> > }
> > +static int eb_submit(struct i915_execbuffer *eb)
> > +{
> > + unsigned int i;
> > + int err;
> > +
> > + err = eb_move_to_gpu(eb);
> > +
> > + for_each_batch_create_order(eb, i) {
> > + if (!eb->requests[i])
> > + break;
> > +
> > + trace_i915_request_queue(eb->requests[i], eb->batch_flags);
> > + if (!err)
> > + err = eb_request_submit(eb, eb->requests[i],
> > + eb->batches[i]->vma,
> > + eb->batch_len[i]);
> > + }
> > +
> > + return err;
> > +}
> > +
> > static int num_vcs_engines(const struct drm_i915_private *i915)
> > {
> > return hweight_long(VDBOX_MASK(&i915->gt));
> > @@ -2291,26 +2341,11 @@ static struct i915_request *eb_throttle(struct
> > i915_execbuffer *eb, struct intel
> > return i915_request_get(rq);
> > }
> > -static struct i915_request *eb_pin_engine(struct i915_execbuffer *eb, bool
> > throttle)
> > +static int eb_pin_timeline(struct i915_execbuffer *eb, struct
> > intel_context *ce,
> > + bool throttle)
> > {
> > - struct intel_context *ce = eb->context;
> > struct intel_timeline *tl;
> > struct i915_request *rq = NULL;
> > - int err;
> > -
> > - GEM_BUG_ON(eb->args->flags & __EXEC_ENGINE_PINNED);
> > -
> > - if (unlikely(intel_context_is_banned(ce)))
> > - return ERR_PTR(-EIO);
> > -
> > - /*
> > - * Pinning the contexts may generate requests in order to acquire
> > - * GGTT space, so do this first before we reserve a seqno for
> > - * ourselves.
> > - */
> > - err = intel_context_pin_ww(ce, &eb->ww);
> > - if (err)
> > - return ERR_PTR(err);
> > /*
> > * Take a local wakeref for preparing to dispatch the execbuf as
> > @@ -2321,33 +2356,108 @@ static struct i915_request *eb_pin_engine(struct
> > i915_execbuffer *eb, bool throt
> > * taken on the engine, and the parent device.
> > */
> > tl = intel_context_timeline_lock(ce);
> > - if (IS_ERR(tl)) {
> > - intel_context_unpin(ce);
> > - return ERR_CAST(tl);
> > - }
> > + if (IS_ERR(tl))
> > + return PTR_ERR(tl);
> > intel_context_enter(ce);
> > if (throttle)
> > rq = eb_throttle(eb, ce);
> > intel_context_timeline_unlock(tl);
> > + if (rq) {
> > + bool nonblock = eb->file->filp->f_flags & O_NONBLOCK;
> > + long timeout = nonblock ? 0 : MAX_SCHEDULE_TIMEOUT;
> > +
> > + if (i915_request_wait(rq, I915_WAIT_INTERRUPTIBLE,
> > + timeout) < 0) {
> > + i915_request_put(rq);
> > +
> > + tl = intel_context_timeline_lock(ce);
> > + intel_context_exit(ce);
> > + intel_context_timeline_unlock(tl);
> > +
> > + if (nonblock)
> > + return -EWOULDBLOCK;
> > + else
> > + return -EINTR;
> > + }
> > + i915_request_put(rq);
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int eb_pin_engine(struct i915_execbuffer *eb, bool throttle)
> > +{
> > + struct intel_context *ce = eb->context, *child;
> > + int err;
> > + int i = 0, j = 0;
> > +
> > + GEM_BUG_ON(eb->args->flags & __EXEC_ENGINE_PINNED);
> > +
> > + if (unlikely(intel_context_is_banned(ce)))
> > + return -EIO;
> > +
> > + /*
> > + * Pinning the contexts may generate requests in order to acquire
> > + * GGTT space, so do this first before we reserve a seqno for
> > + * ourselves.
> > + */
> > + err = intel_context_pin_ww(ce, &eb->ww);
> > + if (err)
> > + return err;
> > + for_each_child(ce, child) {
> > + err = intel_context_pin_ww(child, &eb->ww);
> > + GEM_BUG_ON(err); /* perma-pinned should incr a counter */
> > + }
> > +
> > + for_each_child(ce, child) {
> > + err = eb_pin_timeline(eb, child, throttle);
> > + if (err)
> > + goto unwind;
> > + ++i;
> > + }
> > + err = eb_pin_timeline(eb, ce, throttle);
> > + if (err)
> > + goto unwind;
> > +
> > eb->args->flags |= __EXEC_ENGINE_PINNED;
> > - return rq;
> > + return 0;
> > +
> > +unwind:
> > + for_each_child(ce, child) {
> > + if (j++ < i) {
> > + mutex_lock(&child->timeline->mutex);
> > + intel_context_exit(child);
> > + mutex_unlock(&child->timeline->mutex);
> > + }
> > + }
> > + for_each_child(ce, child)
> > + intel_context_unpin(child);
> > + intel_context_unpin(ce);
> > + return err;
> > }
> > static void eb_unpin_engine(struct i915_execbuffer *eb)
> > {
> > - struct intel_context *ce = eb->context;
> > - struct intel_timeline *tl = ce->timeline;
> > + struct intel_context *ce = eb->context, *child;
> > if (!(eb->args->flags & __EXEC_ENGINE_PINNED))
> > return;
> > eb->args->flags &= ~__EXEC_ENGINE_PINNED;
> > - mutex_lock(&tl->mutex);
> > + for_each_child(ce, child) {
> > + mutex_lock(&child->timeline->mutex);
> > + intel_context_exit(child);
> > + mutex_unlock(&child->timeline->mutex);
> > +
> > + intel_context_unpin(child);
> > + }
> > +
> > + mutex_lock(&ce->timeline->mutex);
> > intel_context_exit(ce);
> > - mutex_unlock(&tl->mutex);
> > + mutex_unlock(&ce->timeline->mutex);
> > intel_context_unpin(ce);
> > }
> > @@ -2398,7 +2508,7 @@ eb_select_legacy_ring(struct i915_execbuffer *eb)
> > static int
> > eb_select_engine(struct i915_execbuffer *eb)
> > {
> > - struct intel_context *ce;
> > + struct intel_context *ce, *child;
> > unsigned int idx;
> > int err;
> > @@ -2411,6 +2521,20 @@ eb_select_engine(struct i915_execbuffer *eb)
> > if (IS_ERR(ce))
> > return PTR_ERR(ce);
> > + if (intel_context_is_parallel(ce)) {
> > + if (eb->buffer_count < ce->parallel.number_children + 1) {
> > + intel_context_put(ce);
> > + return -EINVAL;
> > + }
> > + if (eb->batch_start_offset || eb->args->batch_len) {
> > + intel_context_put(ce);
> > + return -EINVAL;
> > + }
> > + }
> > + eb->num_batches = ce->parallel.number_children + 1;
> > +
> > + for_each_child(ce, child)
> > + intel_context_get(child);
> > intel_gt_pm_get(ce->engine->gt);
> > if (!test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
> > @@ -2418,6 +2542,13 @@ eb_select_engine(struct i915_execbuffer *eb)
> > if (err)
> > goto err;
> > }
> > + for_each_child(ce, child) {
> > + if (!test_bit(CONTEXT_ALLOC_BIT, &child->flags)) {
> > + err = intel_context_alloc_state(child);
> > + if (err)
> > + goto err;
> > + }
> > + }
> > /*
> > * ABI: Before userspace accesses the GPU (e.g. execbuffer), report
> > @@ -2428,7 +2559,7 @@ eb_select_engine(struct i915_execbuffer *eb)
> > goto err;
> > eb->context = ce;
> > - eb->engine = ce->engine;
> > + eb->gt = ce->engine->gt;
> > /*
> > * Make sure engine pool stays alive even if we call intel_context_put
> > @@ -2439,6 +2570,8 @@ eb_select_engine(struct i915_execbuffer *eb)
> > err:
> > intel_gt_pm_put(ce->engine->gt);
> > + for_each_child(ce, child)
> > + intel_context_put(child);
> > intel_context_put(ce);
> > return err;
> > }
> > @@ -2446,7 +2579,11 @@ eb_select_engine(struct i915_execbuffer *eb)
> > static void
> > eb_put_engine(struct i915_execbuffer *eb)
> > {
> > - intel_gt_pm_put(eb->engine->gt);
> > + struct intel_context *child;
> > +
> > + intel_gt_pm_put(eb->gt);
> > + for_each_child(eb->context, child)
> > + intel_context_put(child);
> > intel_context_put(eb->context);
> > }
> > @@ -2669,7 +2806,8 @@ static void put_fence_array(struct eb_fence *fences,
> > int num_fences)
> > }
> > static int
> > -await_fence_array(struct i915_execbuffer *eb)
> > +await_fence_array(struct i915_execbuffer *eb,
> > + struct i915_request *rq)
> > {
> > unsigned int n;
> > int err;
> > @@ -2683,8 +2821,7 @@ await_fence_array(struct i915_execbuffer *eb)
> > if (!eb->fences[n].dma_fence)
> > continue;
> > - err = i915_request_await_dma_fence(eb->request,
> > - eb->fences[n].dma_fence);
> > + err = i915_request_await_dma_fence(rq, eb->fences[n].dma_fence);
> > if (err < 0)
> > return err;
> > }
> > @@ -2692,9 +2829,9 @@ await_fence_array(struct i915_execbuffer *eb)
> > return 0;
> > }
> > -static void signal_fence_array(const struct i915_execbuffer *eb)
> > +static void signal_fence_array(const struct i915_execbuffer *eb,
> > + struct dma_fence * const fence)
> > {
> > - struct dma_fence * const fence = &eb->request->fence;
> > unsigned int n;
> > for (n = 0; n < eb->num_fences; n++) {
> > @@ -2742,9 +2879,9 @@ static void retire_requests(struct intel_timeline
> > *tl, struct i915_request *end)
> > break;
> > }
> > -static int eb_request_add(struct i915_execbuffer *eb, int err)
> > +static int eb_request_add(struct i915_execbuffer *eb, struct i915_request
> > *rq,
> > + int err, bool last_parallel)
> > {
> > - struct i915_request *rq = eb->request;
> > struct intel_timeline * const tl = i915_request_timeline(rq);
> > struct i915_sched_attr attr = {};
> > struct i915_request *prev;
> > @@ -2766,6 +2903,17 @@ static int eb_request_add(struct i915_execbuffer
> > *eb, int err)
> > err = -ENOENT; /* override any transient errors */
> > }
> > + if (intel_context_is_parallel(eb->context)) {
> > + if (err) {
> > + __i915_request_skip(rq);
> > + set_bit(I915_FENCE_FLAG_SKIP_PARALLEL,
> > + &rq->fence.flags);
> > + }
> > + if (last_parallel)
> > + set_bit(I915_FENCE_FLAG_SUBMIT_PARALLEL,
> > + &rq->fence.flags);
> > + }
> > +
> > __i915_request_queue(rq, &attr);
> > /* Try to clean up the client's timeline after submitting the request */
> > @@ -2777,6 +2925,25 @@ static int eb_request_add(struct i915_execbuffer
> > *eb, int err)
> > return err;
> > }
> > +static int eb_requests_add(struct i915_execbuffer *eb, int err)
> > +{
> > + int i;
> > +
> > + /*
> > + * We iterate in reverse order of creation to release timeline mutexes
> > in
> > + * same order.
> > + */
> > + for_each_batch_add_order(eb, i) {
> > + struct i915_request *rq = eb->requests[i];
> > +
> > + if (!rq)
> > + continue;
> > + err |= eb_request_add(eb, rq, err, i == 0);
> > + }
> > +
> > + return err;
> > +}
> > +
> > static const i915_user_extension_fn execbuf_extensions[] = {
> > [DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES] = parse_timeline_fences,
> > };
> > @@ -2803,6 +2970,182 @@ parse_execbuf2_extensions(struct
> > drm_i915_gem_execbuffer2 *args,
> > eb);
> > }
> > +static void eb_requests_get(struct i915_execbuffer *eb)
> > +{
> > + unsigned int i;
> > +
> > + for_each_batch_create_order(eb, i) {
> > + if (!eb->requests[i])
> > + break;
> > +
> > + i915_request_get(eb->requests[i]);
> > + }
> > +}
> > +
> > +static void eb_requests_put(struct i915_execbuffer *eb)
> > +{
> > + unsigned int i;
> > +
> > + for_each_batch_create_order(eb, i) {
> > + if (!eb->requests[i])
> > + break;
> > +
> > + i915_request_put(eb->requests[i]);
> > + }
> > +}
> > +
> > +static struct sync_file *
> > +eb_composite_fence_create(struct i915_execbuffer *eb, int out_fence_fd)
> > +{
> > + struct sync_file *out_fence = NULL;
> > + struct dma_fence_array *fence_array;
> > + struct dma_fence **fences;
> > + unsigned int i;
> > +
> > + GEM_BUG_ON(!intel_context_is_parent(eb->context));
> > +
> > + fences = kmalloc_array(eb->num_batches, sizeof(*fences), GFP_KERNEL);
> > + if (!fences)
> > + return ERR_PTR(-ENOMEM);
> > +
> > + for_each_batch_create_order(eb, i)
> > + fences[i] = &eb->requests[i]->fence;
> > +
> > + fence_array = dma_fence_array_create(eb->num_batches,
> > + fences,
> > +
> > eb->context->parallel.fence_context,
> > + eb->context->parallel.seqno,
> > + false);
> > + if (!fence_array) {
> > + kfree(fences);
> > + return ERR_PTR(-ENOMEM);
> > + }
> > +
> > + /* Move ownership to the dma_fence_array created above */
> > + for_each_batch_create_order(eb, i)
> > + dma_fence_get(fences[i]);
> > +
> > + if (out_fence_fd != -1) {
> > + out_fence = sync_file_create(&fence_array->base);
> > + /* sync_file now owns fence_arry, drop creation ref */
> > + dma_fence_put(&fence_array->base);
> > + if (!out_fence)
> > + return ERR_PTR(-ENOMEM);
> > + }
> > +
> > + eb->composite_fence = &fence_array->base;
> > +
> > + return out_fence;
> > +}
> > +
> > +static struct sync_file *
> > +eb_fences_add(struct i915_execbuffer *eb, struct i915_request *rq,
> > + struct dma_fence *in_fence, int out_fence_fd)
> > +{
> > + struct sync_file *out_fence = NULL;
> > + int err;
> > +
> > + if (unlikely(eb->gem_context->syncobj)) {
> > + struct dma_fence *fence;
> > +
> > + fence = drm_syncobj_fence_get(eb->gem_context->syncobj);
> > + err = i915_request_await_dma_fence(rq, fence);
> > + dma_fence_put(fence);
> > + if (err)
> > + return ERR_PTR(err);
> > + }
> > +
> > + if (in_fence) {
> > + if (eb->args->flags & I915_EXEC_FENCE_SUBMIT)
> > + err = i915_request_await_execution(rq, in_fence);
> > + else
> > + err = i915_request_await_dma_fence(rq, in_fence);
> > + if (err < 0)
> > + return ERR_PTR(err);
> > + }
> > +
> > + if (eb->fences) {
> > + err = await_fence_array(eb, rq);
> > + if (err)
> > + return ERR_PTR(err);
> > + }
> > +
> > + if (intel_context_is_parallel(eb->context)) {
> > + out_fence = eb_composite_fence_create(eb, out_fence_fd);
> > + if (IS_ERR(out_fence))
> > + return ERR_PTR(-ENOMEM);
> > + } else if (out_fence_fd != -1) {
> > + out_fence = sync_file_create(&rq->fence);
> > + if (!out_fence)
> > + return ERR_PTR(-ENOMEM);
> > + }
> > +
> > + return out_fence;
> > +}
> > +
> > +static struct intel_context *
> > +eb_find_context(struct i915_execbuffer *eb, unsigned int context_number)
> > +{
> > + struct intel_context *child;
> > +
> > + if (likely(context_number == 0))
> > + return eb->context;
> > +
> > + for_each_child(eb->context, child)
> > + if (!--context_number)
> > + return child;
> > +
> > + GEM_BUG_ON("Context not found");
> > +
> > + return NULL;
> > +}
> > +
> > +static struct sync_file *
> > +eb_requests_create(struct i915_execbuffer *eb, struct dma_fence *in_fence,
> > + int out_fence_fd)
> > +{
> > + struct sync_file *out_fence = NULL;
> > + unsigned int i;
> > +
> > + for_each_batch_create_order(eb, i) {
> > + /* Allocate a request for this batch buffer nice and early. */
> > + eb->requests[i] = i915_request_create(eb_find_context(eb, i));
> > + if (IS_ERR(eb->requests[i])) {
> > + out_fence = ERR_PTR(PTR_ERR(eb->requests[i]));
> > + eb->requests[i] = NULL;
> > + return out_fence;
> > + }
> > +
> > + /*
> > + * Only the first request added (committed to backend) has to
> > + * take the in fences into account as all subsequent requests
> > + * will have fences inserted inbetween them.
> > + */
> > + if (i + 1 == eb->num_batches) {
> > + out_fence = eb_fences_add(eb, eb->requests[i],
> > + in_fence, out_fence_fd);
> > + if (IS_ERR(out_fence))
> > + return out_fence;
> > + }
> > +
> > + /*
> > + * Whilst this request exists, batch_obj will be on the
> > + * active_list, and so will hold the active reference. Only when
> > + * this request is retired will the batch_obj be moved onto
> > + * the inactive_list and lose its active reference. Hence we do
> > + * not need to explicitly hold another reference here.
> > + */
> > + eb->requests[i]->batch = eb->batches[i]->vma;
> > + if (eb->batch_pool) {
> > + GEM_BUG_ON(intel_context_is_parallel(eb->context));
> > + intel_gt_buffer_pool_mark_active(eb->batch_pool,
> > + eb->requests[i]);
> > + }
> > + }
> > +
> > + return out_fence;
> > +}
> > +
> > static int
> > i915_gem_do_execbuffer(struct drm_device *dev,
> > struct drm_file *file,
> > @@ -2813,7 +3156,6 @@ i915_gem_do_execbuffer(struct drm_device *dev,
> > struct i915_execbuffer eb;
> > struct dma_fence *in_fence = NULL;
> > struct sync_file *out_fence = NULL;
> > - struct i915_vma *batch;
> > int out_fence_fd = -1;
> > int err;
> > @@ -2837,12 +3179,15 @@ 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;
> > eb.fences = NULL;
> > eb.num_fences = 0;
> > + memset(eb.requests, 0, sizeof(struct i915_request *) *
> > + ARRAY_SIZE(eb.requests));
> > + eb.composite_fence = NULL;
> > +
> > eb.batch_flags = 0;
> > if (args->flags & I915_EXEC_SECURE) {
> > if (GRAPHICS_VER(i915) >= 11)
> > @@ -2926,70 +3271,25 @@ i915_gem_do_execbuffer(struct drm_device *dev,
> > ww_acquire_done(&eb.ww.ctx);
> > - batch = eb.batch->vma;
> > -
> > - /* Allocate a request for this batch buffer nice and early. */
> > - eb.request = i915_request_create(eb.context);
> > - if (IS_ERR(eb.request)) {
> > - err = PTR_ERR(eb.request);
> > - goto err_vma;
> > - }
> > -
> > - if (unlikely(eb.gem_context->syncobj)) {
> > - struct dma_fence *fence;
> > -
> > - fence = drm_syncobj_fence_get(eb.gem_context->syncobj);
> > - err = i915_request_await_dma_fence(eb.request, fence);
> > - dma_fence_put(fence);
> > - if (err)
> > - goto err_ext;
> > - }
> > -
> > - if (in_fence) {
> > - if (args->flags & I915_EXEC_FENCE_SUBMIT)
> > - err = i915_request_await_execution(eb.request,
> > - in_fence);
> > - else
> > - err = i915_request_await_dma_fence(eb.request,
> > - in_fence);
> > - if (err < 0)
> > - goto err_request;
> > - }
> > -
> > - if (eb.fences) {
> > - err = await_fence_array(&eb);
> > - if (err)
> > + out_fence = eb_requests_create(&eb, in_fence, out_fence_fd);
> > + if (IS_ERR(out_fence)) {
> > + err = PTR_ERR(out_fence);
> > + if (eb.requests[0])
> > goto err_request;
> > + else
> > + goto err_vma;
> > }
> > - if (out_fence_fd != -1) {
> > - out_fence = sync_file_create(&eb.request->fence);
> > - if (!out_fence) {
> > - err = -ENOMEM;
> > - goto err_request;
> > - }
> > - }
> > -
> > - /*
> > - * Whilst this request exists, batch_obj will be on the
> > - * active_list, and so will hold the active reference. Only when this
> > - * request is retired will the the batch_obj be moved onto the
> > - * inactive_list and lose its active reference. Hence we do not need
> > - * to explicitly hold another reference here.
> > - */
> > - eb.request->batch = batch;
> > - if (eb.batch_pool)
> > - intel_gt_buffer_pool_mark_active(eb.batch_pool, eb.request);
> > -
> > - trace_i915_request_queue(eb.request, eb.batch_flags);
> > - err = eb_submit(&eb, batch);
> > + err = eb_submit(&eb);
> > err_request:
> > - i915_request_get(eb.request);
> > - err = eb_request_add(&eb, err);
> > + eb_requests_get(&eb);
> > + err = eb_requests_add(&eb, err);
> > if (eb.fences)
> > - signal_fence_array(&eb);
> > + signal_fence_array(&eb, eb.composite_fence ?
> > + eb.composite_fence :
> > + &eb.requests[0]->fence);
> > if (out_fence) {
> > if (err == 0) {
> > @@ -3004,10 +3304,15 @@ i915_gem_do_execbuffer(struct drm_device *dev,
> > if (unlikely(eb.gem_context->syncobj)) {
> > drm_syncobj_replace_fence(eb.gem_context->syncobj,
> > - &eb.request->fence);
> > + eb.composite_fence ?
> > + eb.composite_fence :
> > + &eb.requests[0]->fence);
> > }
> > - i915_request_put(eb.request);
> > + if (!out_fence && eb.composite_fence)
> > + dma_fence_put(eb.composite_fence);
> > +
> > + eb_requests_put(&eb);
> > err_vma:
> > eb_release_vmas(&eb, true);
> > diff --git a/drivers/gpu/drm/i915/gt/intel_context.h
> > b/drivers/gpu/drm/i915/gt/intel_context.h
> > index 1bc705f98e2a..1781419fa105 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_context.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_context.h
> > @@ -239,7 +239,13 @@ intel_context_timeline_lock(struct intel_context *ce)
> > struct intel_timeline *tl = ce->timeline;
> > int err;
> > - err = mutex_lock_interruptible(&tl->mutex);
> > + if (intel_context_is_parent(ce))
> > + err = mutex_lock_interruptible_nested(&tl->mutex, 0);
> > + else if (intel_context_is_child(ce))
> > + err = mutex_lock_interruptible_nested(&tl->mutex,
> > + ce->parallel.child_index
> > + 1);
> > + else
> > + err = mutex_lock_interruptible(&tl->mutex);
> > if (err)
> > return ERR_PTR(err);
> > diff --git a/drivers/gpu/drm/i915/gt/intel_context_types.h
> > b/drivers/gpu/drm/i915/gt/intel_context_types.h
> > index 95a5b94b4ece..9e0177dc5484 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_context_types.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_context_types.h
> > @@ -248,6 +248,16 @@ struct intel_context {
> > * context
> > */
> > struct i915_request *last_rq;
> > + /**
> > + * @fence_context: fence context composite fence when doing
> > + * parallel submission
> > + */
> > + u64 fence_context;
> > + /**
> > + * @seqno: seqno for composite fence when doing parallel
> > + * submission
> > + */
> > + u32 seqno;
> > /** @number_children: number of children if parent */
> > u8 number_children;
> > /** @child_index: index into child_list if child */
> > diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > index ae08a196ba0a..bfafe996e2d2 100644
> > --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > @@ -3099,6 +3099,8 @@ guc_create_parallel(struct intel_engine_cs **engines,
> > }
> > }
> > + parent->parallel.fence_context = dma_fence_context_alloc(1);
> > +
> > parent->engine->emit_bb_start =
> > emit_bb_start_parent_no_preempt_mid_batch;
> > parent->engine->emit_fini_breadcrumb =
> > diff --git a/drivers/gpu/drm/i915/i915_request.h
> > b/drivers/gpu/drm/i915/i915_request.h
> > index 8950785e55d6..24db8459376b 100644
> > --- a/drivers/gpu/drm/i915/i915_request.h
> > +++ b/drivers/gpu/drm/i915/i915_request.h
> > @@ -147,6 +147,15 @@ enum {
> > * tail.
> > */
> > I915_FENCE_FLAG_SUBMIT_PARALLEL,
> > +
> > + /*
> > + * I915_FENCE_FLAG_SKIP_PARALLEL - request with a context in a
> > + * parent-child relationship (parallel submission, multi-lrc) that
> > + * hit an error while generating requests in the execbuf IOCTL.
> > + * Indicates this request should be skipped as another request in
> > + * submission / relationship encoutered an error.
> > + */
> > + I915_FENCE_FLAG_SKIP_PARALLEL,
> > };
> > /**
> > diff --git a/drivers/gpu/drm/i915/i915_vma.c
> > b/drivers/gpu/drm/i915/i915_vma.c
> > index 4b7fc4647e46..90546fa58fc1 100644
> > --- a/drivers/gpu/drm/i915/i915_vma.c
> > +++ b/drivers/gpu/drm/i915/i915_vma.c
> > @@ -1234,9 +1234,10 @@ int __i915_vma_move_to_active(struct i915_vma *vma,
> > struct i915_request *rq)
> > return i915_active_add_request(&vma->active, rq);
> > }
> > -int i915_vma_move_to_active(struct i915_vma *vma,
> > - struct i915_request *rq,
> > - unsigned int flags)
> > +int _i915_vma_move_to_active(struct i915_vma *vma,
> > + struct i915_request *rq,
> > + struct dma_fence *fence,
> > + unsigned int flags)
> > {
> > struct drm_i915_gem_object *obj = vma->obj;
> > int err;
> > @@ -1257,9 +1258,11 @@ int i915_vma_move_to_active(struct i915_vma *vma,
> > intel_frontbuffer_put(front);
> > }
> > - dma_resv_add_excl_fence(vma->resv, &rq->fence);
> > - obj->write_domain = I915_GEM_DOMAIN_RENDER;
> > - obj->read_domains = 0;
> > + if (fence) {
> > + dma_resv_add_excl_fence(vma->resv, fence);
> > + obj->write_domain = I915_GEM_DOMAIN_RENDER;
> > + obj->read_domains = 0;
> > + }
> > } else {
> > if (!(flags & __EXEC_OBJECT_NO_RESERVE)) {
> > err = dma_resv_reserve_shared(vma->resv, 1);
> > @@ -1267,8 +1270,10 @@ int i915_vma_move_to_active(struct i915_vma *vma,
> > return err;
> > }
> > - dma_resv_add_shared_fence(vma->resv, &rq->fence);
> > - obj->write_domain = 0;
> > + if (fence) {
> > + dma_resv_add_shared_fence(vma->resv, fence);
> > + obj->write_domain = 0;
> > + }
> > }
> > if (flags & EXEC_OBJECT_NEEDS_FENCE && vma->fence)
> > diff --git a/drivers/gpu/drm/i915/i915_vma.h
> > b/drivers/gpu/drm/i915/i915_vma.h
> > index ed69f66c7ab0..648dbe744c96 100644
> > --- a/drivers/gpu/drm/i915/i915_vma.h
> > +++ b/drivers/gpu/drm/i915/i915_vma.h
> > @@ -57,9 +57,16 @@ static inline bool i915_vma_is_active(const struct
> > i915_vma *vma)
> > int __must_check __i915_vma_move_to_active(struct i915_vma *vma,
> > struct i915_request *rq);
> > -int __must_check i915_vma_move_to_active(struct i915_vma *vma,
> > - struct i915_request *rq,
> > - unsigned int flags);
> > +int __must_check _i915_vma_move_to_active(struct i915_vma *vma,
> > + struct i915_request *rq,
> > + struct dma_fence *fence,
> > + unsigned int flags);
> > +static inline int __must_check
> > +i915_vma_move_to_active(struct i915_vma *vma, struct i915_request *rq,
> > + unsigned int flags)
> > +{
> > + return _i915_vma_move_to_active(vma, rq, &rq->fence, flags);
> > +}
> > #define __i915_vma_flags(v) ((unsigned long *)&(v)->flags.counter)
>
