Hi Niranjana,
On Tue, Jan 17, 2023 at 11:15:58PM -0800, Niranjana Vishwanathapura wrote:
> Update the execbuf path to use common execbuf functions to
> reduce code duplication with the newer execbuf3 path.
>
> Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx>
> Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@xxxxxxxxx>
Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
Andi
> ---
> .../gpu/drm/i915/gem/i915_gem_execbuffer.c | 513 ++----------------
> 1 file changed, 39 insertions(+), 474 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> index 6a7f0227f65f..8b49543f3265 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> @@ -28,6 +28,7 @@
> #include "i915_file_private.h"
> #include "i915_gem_clflush.h"
> #include "i915_gem_context.h"
> +#include "i915_gem_execbuffer_common.h"
> #include "i915_gem_evict.h"
> #include "i915_gem_ioctls.h"
> #include "i915_reg.h"
> @@ -236,13 +237,6 @@ enum {
> * the batchbuffer in trusted mode, otherwise the ioctl is rejected.
> */
>
> -struct eb_fence {
> - struct drm_syncobj *syncobj; /* Use with ptr_mask_bits() */
> - struct dma_fence *dma_fence;
> - u64 value;
> - struct dma_fence_chain *chain_fence;
> -};
> -
> struct i915_execbuffer {
> struct drm_i915_private *i915; /** i915 backpointer */
> struct drm_file *file; /** per-file lookup tables and limits */
> @@ -2452,164 +2446,29 @@ static const enum intel_engine_id user_ring_map[] = {
> [I915_EXEC_VEBOX] = VECS0
> };
>
> -static struct i915_request *eb_throttle(struct i915_execbuffer *eb, struct intel_context *ce)
> -{
> - struct intel_ring *ring = ce->ring;
> - struct intel_timeline *tl = ce->timeline;
> - struct i915_request *rq;
> -
> - /*
> - * Completely unscientific finger-in-the-air estimates for suitable
> - * maximum user request size (to avoid blocking) and then backoff.
> - */
> - if (intel_ring_update_space(ring) >= PAGE_SIZE)
> - return NULL;
> -
> - /*
> - * Find a request that after waiting upon, there will be at least half
> - * the ring available. The hysteresis allows us to compete for the
> - * shared ring and should mean that we sleep less often prior to
> - * claiming our resources, but not so long that the ring completely
> - * drains before we can submit our next request.
> - */
> - list_for_each_entry(rq, &tl->requests, link) {
> - if (rq->ring != ring)
> - continue;
> -
> - if (__intel_ring_space(rq->postfix,
> - ring->emit, ring->size) > ring->size / 2)
> - break;
> - }
> - if (&rq->link == &tl->requests)
> - return NULL; /* weird, we will check again later for real */
> -
> - return i915_request_get(rq);
> -}
> -
> -static int eb_pin_timeline(struct i915_execbuffer *eb, struct intel_context *ce,
> - bool throttle)
> -{
> - struct intel_timeline *tl;
> - struct i915_request *rq = NULL;
> -
> - /*
> - * Take a local wakeref for preparing to dispatch the execbuf as
> - * we expect to access the hardware fairly frequently in the
> - * process, and require the engine to be kept awake between accesses.
> - * Upon dispatch, we acquire another prolonged wakeref that we hold
> - * until the timeline is idle, which in turn releases the wakeref
> - * taken on the engine, and the parent device.
> - */
> - tl = intel_context_timeline_lock(ce);
> - 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);
> -
> - /*
> - * Error path, cannot use intel_context_timeline_lock as
> - * that is user interruptable and this clean up step
> - * must be done.
> - */
> - mutex_lock(&ce->timeline->mutex);
> - intel_context_exit(ce);
> - mutex_unlock(&ce->timeline->mutex);
> -
> - 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);
> + err = i915_eb_pin_engine(eb->context, &eb->ww, throttle,
> + eb->file->filp->f_flags & O_NONBLOCK);
> 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 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, *child;
> -
> if (!(eb->args->flags & __EXEC_ENGINE_PINNED))
> return;
>
> eb->args->flags &= ~__EXEC_ENGINE_PINNED;
>
> - 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(&ce->timeline->mutex);
> -
> - intel_context_unpin(ce);
> + i915_eb_unpin_engine(eb->context);
> }
>
> static unsigned int
> @@ -2658,7 +2517,7 @@ eb_select_legacy_ring(struct i915_execbuffer *eb)
> static int
> eb_select_engine(struct i915_execbuffer *eb)
> {
> - struct intel_context *ce, *child;
> + struct intel_context *ce;
> unsigned int idx;
> int err;
>
> @@ -2683,36 +2542,10 @@ eb_select_engine(struct i915_execbuffer *eb)
> }
> 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)) {
> - err = intel_context_alloc_state(ce);
> - 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
> - * EIO if the GPU is already wedged.
> - */
> - err = intel_gt_terminally_wedged(ce->engine->gt);
> + err = i915_eb_select_engine(ce);
> if (err)
> goto err;
>
> - if (!i915_vm_tryget(ce->vm)) {
> - err = -ENOENT;
> - goto err;
> - }
> -
> eb->context = ce;
> eb->gt = ce->engine->gt;
>
> @@ -2721,12 +2554,9 @@ eb_select_engine(struct i915_execbuffer *eb)
> * during ww handling. The pool is destroyed when last pm reference
> * is dropped, which breaks our -EDEADLK handling.
> */
> - return err;
> + return 0;
>
> err:
> - intel_gt_pm_put(ce->engine->gt);
> - for_each_child(ce, child)
> - intel_context_put(child);
> intel_context_put(ce);
> return err;
> }
> @@ -2734,24 +2564,7 @@ eb_select_engine(struct i915_execbuffer *eb)
> static void
> eb_put_engine(struct i915_execbuffer *eb)
> {
> - struct intel_context *child;
> -
> - i915_vm_put(eb->context->vm);
> - intel_gt_pm_put(eb->gt);
> - for_each_child(eb->context, child)
> - intel_context_put(child);
> - intel_context_put(eb->context);
> -}
> -
> -static void
> -__free_fence_array(struct eb_fence *fences, unsigned int n)
> -{
> - while (n--) {
> - drm_syncobj_put(ptr_mask_bits(fences[n].syncobj, 2));
> - dma_fence_put(fences[n].dma_fence);
> - dma_fence_chain_free(fences[n].chain_fence);
> - }
> - kvfree(fences);
> + i915_eb_put_engine(eb->context);
> }
>
> static int
> @@ -2762,7 +2575,6 @@ add_timeline_fence_array(struct i915_execbuffer *eb,
> u64 __user *user_values;
> struct eb_fence *f;
> u64 nfences;
> - int err = 0;
>
> nfences = timeline_fences->fence_count;
> if (!nfences)
> @@ -2797,9 +2609,9 @@ add_timeline_fence_array(struct i915_execbuffer *eb,
>
> while (nfences--) {
> struct drm_i915_gem_exec_fence user_fence;
> - struct drm_syncobj *syncobj;
> - struct dma_fence *fence = NULL;
> + bool wait, signal;
> u64 point;
> + int ret;
>
> if (__copy_from_user(&user_fence,
> user_fences++,
> @@ -2812,75 +2624,16 @@ add_timeline_fence_array(struct i915_execbuffer *eb,
> if (__get_user(point, user_values++))
> return -EFAULT;
>
> - syncobj = drm_syncobj_find(eb->file, user_fence.handle);
> - if (!syncobj) {
> - drm_dbg(&eb->i915->drm,
> - "Invalid syncobj handle provided\n");
> - return -ENOENT;
> - }
> -
> - fence = drm_syncobj_fence_get(syncobj);
> -
> - if (!fence && user_fence.flags &&
> - !(user_fence.flags & I915_EXEC_FENCE_SIGNAL)) {
> - drm_dbg(&eb->i915->drm,
> - "Syncobj handle has no fence\n");
> - drm_syncobj_put(syncobj);
> - return -EINVAL;
> - }
> -
> - if (fence)
> - err = dma_fence_chain_find_seqno(&fence, point);
> -
> - if (err && !(user_fence.flags & I915_EXEC_FENCE_SIGNAL)) {
> - drm_dbg(&eb->i915->drm,
> - "Syncobj handle missing requested point %llu\n",
> - point);
> - dma_fence_put(fence);
> - drm_syncobj_put(syncobj);
> - return err;
> - }
> -
> - /*
> - * A point might have been signaled already and
> - * garbage collected from the timeline. In this case
> - * just ignore the point and carry on.
> - */
> - if (!fence && !(user_fence.flags & I915_EXEC_FENCE_SIGNAL)) {
> - drm_syncobj_put(syncobj);
> + wait = user_fence.flags & I915_EXEC_FENCE_WAIT;
> + signal = user_fence.flags & I915_EXEC_FENCE_SIGNAL;
> + ret = i915_eb_add_timeline_fence(eb->i915, eb->file,
> + user_fence.handle, point,
> + f, wait, signal);
> + if (ret < 0)
> + return ret;
> + else if (!ret)
> continue;
> - }
> -
> - /*
> - * For timeline syncobjs we need to preallocate chains for
> - * later signaling.
> - */
> - if (point != 0 && user_fence.flags & I915_EXEC_FENCE_SIGNAL) {
> - /*
> - * Waiting and signaling the same point (when point !=
> - * 0) would break the timeline.
> - */
> - if (user_fence.flags & I915_EXEC_FENCE_WAIT) {
> - drm_dbg(&eb->i915->drm,
> - "Trying to wait & signal the same timeline point.\n");
> - dma_fence_put(fence);
> - drm_syncobj_put(syncobj);
> - return -EINVAL;
> - }
> -
> - f->chain_fence = dma_fence_chain_alloc();
> - if (!f->chain_fence) {
> - drm_syncobj_put(syncobj);
> - dma_fence_put(fence);
> - return -ENOMEM;
> - }
> - } else {
> - f->chain_fence = NULL;
> - }
>
> - f->syncobj = ptr_pack_bits(syncobj, user_fence.flags, 2);
> - f->dma_fence = fence;
> - f->value = point;
> f++;
> eb->num_fences++;
> }
> @@ -2962,60 +2715,6 @@ static int add_fence_array(struct i915_execbuffer *eb)
> return 0;
> }
>
> -static void put_fence_array(struct eb_fence *fences, int num_fences)
> -{
> - if (fences)
> - __free_fence_array(fences, num_fences);
> -}
> -
> -static int
> -await_fence_array(struct i915_execbuffer *eb,
> - struct i915_request *rq)
> -{
> - unsigned int n;
> - int err;
> -
> - for (n = 0; n < eb->num_fences; n++) {
> - if (!eb->fences[n].dma_fence)
> - continue;
> -
> - err = i915_request_await_dma_fence(rq, eb->fences[n].dma_fence);
> - if (err < 0)
> - return err;
> - }
> -
> - return 0;
> -}
> -
> -static void signal_fence_array(const struct i915_execbuffer *eb,
> - struct dma_fence * const fence)
> -{
> - unsigned int n;
> -
> - for (n = 0; n < eb->num_fences; n++) {
> - struct drm_syncobj *syncobj;
> - unsigned int flags;
> -
> - syncobj = ptr_unpack_bits(eb->fences[n].syncobj, &flags, 2);
> - if (!(flags & I915_EXEC_FENCE_SIGNAL))
> - continue;
> -
> - if (eb->fences[n].chain_fence) {
> - drm_syncobj_add_point(syncobj,
> - eb->fences[n].chain_fence,
> - fence,
> - eb->fences[n].value);
> - /*
> - * The chain's ownership is transferred to the
> - * timeline.
> - */
> - eb->fences[n].chain_fence = NULL;
> - } else {
> - drm_syncobj_replace_fence(syncobj, fence);
> - }
> - }
> -}
> -
> static int
> parse_timeline_fences(struct i915_user_extension __user *ext, void *data)
> {
> @@ -3028,80 +2727,6 @@ parse_timeline_fences(struct i915_user_extension __user *ext, void *data)
> return add_timeline_fence_array(eb, &timeline_fences);
> }
>
> -static void retire_requests(struct intel_timeline *tl, struct i915_request *end)
> -{
> - struct i915_request *rq, *rn;
> -
> - list_for_each_entry_safe(rq, rn, &tl->requests, link)
> - if (rq == end || !i915_request_retire(rq))
> - break;
> -}
> -
> -static int eb_request_add(struct i915_execbuffer *eb, struct i915_request *rq,
> - int err, bool last_parallel)
> -{
> - struct intel_timeline * const tl = i915_request_timeline(rq);
> - struct i915_sched_attr attr = {};
> - struct i915_request *prev;
> -
> - lockdep_assert_held(&tl->mutex);
> - lockdep_unpin_lock(&tl->mutex, rq->cookie);
> -
> - trace_i915_request_add(rq);
> -
> - prev = __i915_request_commit(rq);
> -
> - /* Check that the context wasn't destroyed before submission */
> - if (likely(!intel_context_is_closed(eb->context))) {
> - attr = eb->gem_context->sched;
> - } else {
> - /* Serialise with context_close via the add_to_timeline */
> - i915_request_set_error_once(rq, -ENOENT);
> - __i915_request_skip(rq);
> - 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 */
> - if (prev)
> - retire_requests(tl, prev);
> -
> - mutex_unlock(&tl->mutex);
> -
> - 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,
> };
> @@ -3128,73 +2753,26 @@ 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));
> + struct dma_fence *fence;
>
> - 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;
> - __set_bit(I915_FENCE_FLAG_COMPOSITE,
> - &eb->requests[i]->fence.flags);
> - }
> -
> - 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]);
> + fence = i915_eb_composite_fence_create(eb->requests, eb->num_batches,
> + eb->context);
> + if (IS_ERR(fence))
> + return ERR_CAST(fence);
>
> if (out_fence_fd != -1) {
> - out_fence = sync_file_create(&fence_array->base);
> + out_fence = sync_file_create(fence);
> /* sync_file now owns fence_arry, drop creation ref */
> - dma_fence_put(&fence_array->base);
> + dma_fence_put(fence);
> if (!out_fence)
> return ERR_PTR(-ENOMEM);
> }
>
> - eb->composite_fence = &fence_array->base;
> + eb->composite_fence = fence;
>
> return out_fence;
> }
> @@ -3226,7 +2804,7 @@ eb_fences_add(struct i915_execbuffer *eb, struct i915_request *rq,
> }
>
> if (eb->fences) {
> - err = await_fence_array(eb, rq);
> + err = i915_eb_await_fence_array(eb->fences, eb->num_fences, rq);
> if (err)
> return ERR_PTR(err);
> }
> @@ -3244,23 +2822,6 @@ eb_fences_add(struct i915_execbuffer *eb, struct i915_request *rq,
> 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)
> @@ -3270,7 +2831,9 @@ eb_requests_create(struct i915_execbuffer *eb, struct dma_fence *in_fence,
>
> 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));
> + eb->requests[i] =
> + i915_request_create(i915_eb_find_context(eb->context,
> + i));
> if (IS_ERR(eb->requests[i])) {
> out_fence = ERR_CAST(eb->requests[i]);
> eb->requests[i] = NULL;
> @@ -3450,13 +3013,15 @@ i915_gem_do_execbuffer(struct drm_device *dev,
> err = eb_submit(&eb);
>
> err_request:
> - eb_requests_get(&eb);
> - err = eb_requests_add(&eb, err);
> + i915_eb_requests_get(eb.requests, eb.num_batches);
> + err = i915_eb_requests_add(eb.requests, eb.num_batches, eb.context,
> + eb.gem_context->sched, err);
>
> if (eb.fences)
> - signal_fence_array(&eb, eb.composite_fence ?
> - eb.composite_fence :
> - &eb.requests[0]->fence);
> + i915_eb_signal_fence_array(eb.fences, eb.num_fences,
> + eb.composite_fence ?
> + eb.composite_fence :
> + &eb.requests[0]->fence);
>
> if (out_fence) {
> if (err == 0) {
> @@ -3479,7 +3044,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
> if (!out_fence && eb.composite_fence)
> dma_fence_put(eb.composite_fence);
>
> - eb_requests_put(&eb);
> + i915_eb_requests_put(eb.requests, eb.num_batches);
>
> err_vma:
> eb_release_vmas(&eb, true);
> @@ -3500,7 +3065,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
> err_in_fence:
> dma_fence_put(in_fence);
> err_ext:
> - put_fence_array(eb.fences, eb.num_fences);
> + i915_eb_put_fence_array(eb.fences, eb.num_fences);
> return err;
> }
>
> --
> 2.21.0.rc0.32.g243a4c7e27
