return ret;
}
-static int logical_ring_wait_for_space(struct drm_i915_gem_request *req,
- int bytes)
-{
- struct intel_ringbuffer *ringbuf = req->ringbuf;
- struct intel_engine_cs *engine = req->engine;
- struct drm_i915_gem_request *target;
- unsigned space;
- int ret;
-
- if (intel_ring_space(ringbuf) >= bytes)
- return 0;
-
- /* The whole point of reserving space is to not wait! */
- WARN_ON(ringbuf->reserved_in_use);
-
- list_for_each_entry(target, &engine->request_list, list) {
- /*
- * The request queue is per-engine, so can contain requests
- * from multiple ringbuffers. Here, we must ignore any that
- * aren't from the ringbuffer we're considering.
- */
- if (target->ringbuf != ringbuf)
- continue;
-
- /* Would completion of this request free enough space? */
- space = __intel_ring_space(target->postfix, ringbuf->tail,
- ringbuf->size);
- if (space >= bytes)
- break;
- }
-
- if (WARN_ON(&target->list == &engine->request_list))
- return -ENOSPC;
-
- ret = i915_wait_request(target);
- if (ret)
- return ret;
-
- ringbuf->space = space;
- return 0;
-}
-
/*
* intel_logical_ring_advance_and_submit() - advance the tail and submit the workload
* @request: Request to advance the logical ringbuffer of.
return 0;
}
-static void __wrap_ring_buffer(struct intel_ringbuffer *ringbuf)
-{
- uint32_t __iomem *virt;
- int rem = ringbuf->size - ringbuf->tail;
-
- virt = ringbuf->virtual_start + ringbuf->tail;
- rem /= 4;
- while (rem--)
- iowrite32(MI_NOOP, virt++);
-
- ringbuf->tail = 0;
- intel_ring_update_space(ringbuf);
-}
-
-static int logical_ring_prepare(struct drm_i915_gem_request *req, int bytes)
-{
- struct intel_ringbuffer *ringbuf = req->ringbuf;
- int remain_usable = ringbuf->effective_size - ringbuf->tail;
- int remain_actual = ringbuf->size - ringbuf->tail;
- int ret, total_bytes, wait_bytes = 0;
- bool need_wrap = false;
-
- if (ringbuf->reserved_in_use)
- total_bytes = bytes;
- else
- total_bytes = bytes + ringbuf->reserved_size;
-
- if (unlikely(bytes > remain_usable)) {
- /*
- * Not enough space for the basic request. So need to flush
- * out the remainder and then wait for base + reserved.
- */
- wait_bytes = remain_actual + total_bytes;
- need_wrap = true;
- } else {
- if (unlikely(total_bytes > remain_usable)) {
- /*
- * The base request will fit but the reserved space
- * falls off the end. So don't need an immediate wrap
- * and only need to effectively wait for the reserved
- * size space from the start of ringbuffer.
- */
- wait_bytes = remain_actual + ringbuf->reserved_size;
- } else if (total_bytes > ringbuf->space) {
- /* No wrapping required, just waiting. */
- wait_bytes = total_bytes;
- }
- }
-
- if (wait_bytes) {
- ret = logical_ring_wait_for_space(req, wait_bytes);
- if (unlikely(ret))
- return ret;
-
- if (need_wrap)
- __wrap_ring_buffer(ringbuf);
- }
-
- return 0;
-}
-
-/**
- * intel_logical_ring_begin() - prepare the logical ringbuffer to accept some commands
- *
- * @req: The request to start some new work for
- * @num_dwords: number of DWORDs that we plan to write to the ringbuffer.
- *
- * The ringbuffer might not be ready to accept the commands right away (maybe it needs to
- * be wrapped, or wait a bit for the tail to be updated). This function takes care of that
- * and also preallocates a request (every workload submission is still mediated through
- * requests, same as it did with legacy ringbuffer submission).
- *
- * Return: non-zero if the ringbuffer is not ready to be written to.
- */
-int intel_logical_ring_begin(struct drm_i915_gem_request *req, int num_dwords)
-{
- int ret;
-
- ret = logical_ring_prepare(req, num_dwords * sizeof(uint32_t));
- if (ret)
- return ret;
-
- req->ringbuf->space -= num_dwords * sizeof(uint32_t);
- return 0;
-}
-
int intel_logical_ring_reserve_space(struct drm_i915_gem_request *request)
{
/*
*/
intel_ring_reserved_space_reserve(request->ringbuf, MIN_SPACE_FOR_ADD_REQUEST);
- return intel_logical_ring_begin(request, 0);
+ return intel_ring_begin(request, 0);
}
/**
if (engine == &dev_priv->engine[RCS] &&
instp_mode != dev_priv->relative_constants_mode) {
- ret = intel_logical_ring_begin(params->request, 4);
+ ret = intel_ring_begin(params->request, 4);
if (ret)
return ret;
if (ret)
return ret;
- ret = intel_logical_ring_begin(req, w->count * 2 + 2);
+ ret = intel_ring_begin(req, w->count * 2 + 2);
if (ret)
return ret;
const int num_lri_cmds = GEN8_LEGACY_PDPES * 2;
int i, ret;
- ret = intel_logical_ring_begin(req, num_lri_cmds * 2 + 2);
+ ret = intel_ring_begin(req, num_lri_cmds * 2 + 2);
if (ret)
return ret;
req->ctx->ppgtt->pd_dirty_rings &= ~intel_engine_flag(req->engine);
}
- ret = intel_logical_ring_begin(req, 4);
+ ret = intel_ring_begin(req, 4);
if (ret)
return ret;
uint32_t cmd;
int ret;
- ret = intel_logical_ring_begin(request, 4);
+ ret = intel_ring_begin(request, 4);
if (ret)
return ret;
vf_flush_wa = true;
}
- ret = intel_logical_ring_begin(request, vf_flush_wa ? 12 : 6);
+ ret = intel_ring_begin(request, vf_flush_wa ? 12 : 6);
if (ret)
return ret;
struct intel_ringbuffer *ringbuf = request->ringbuf;
int ret;
- ret = intel_logical_ring_begin(request, 6 + WA_TAIL_DWORDS);
+ ret = intel_ring_begin(request, 6 + WA_TAIL_DWORDS);
if (ret)
return ret;
struct intel_ringbuffer *ringbuf = request->ringbuf;
int ret;
- ret = intel_logical_ring_begin(request, 8 + WA_TAIL_DWORDS);
+ ret = intel_ring_begin(request, 8 + WA_TAIL_DWORDS);
if (ret)
return ret;
ringbuf->tail, ringbuf->size);
}
-int intel_ring_space(struct intel_ringbuffer *ringbuf)
-{
- intel_ring_update_space(ringbuf);
- return ringbuf->space;
-}
-
bool intel_engine_stopped(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->dev->dev_private;
engine->dev = NULL;
}
-static int ring_wait_for_space(struct intel_engine_cs *engine, int n)
-{
- struct intel_ringbuffer *ringbuf = engine->buffer;
- struct drm_i915_gem_request *request;
- unsigned space;
- int ret;
-
- if (intel_ring_space(ringbuf) >= n)
- return 0;
-
- /* The whole point of reserving space is to not wait! */
- WARN_ON(ringbuf->reserved_in_use);
-
- list_for_each_entry(request, &engine->request_list, list) {
- space = __intel_ring_space(request->postfix, ringbuf->tail,
- ringbuf->size);
- if (space >= n)
- break;
- }
-
- if (WARN_ON(&request->list == &engine->request_list))
- return -ENOSPC;
-
- ret = i915_wait_request(request);
- if (ret)
- return ret;
-
- ringbuf->space = space;
- return 0;
-}
-
-static void __wrap_ring_buffer(struct intel_ringbuffer *ringbuf)
-{
- uint32_t __iomem *virt;
- int rem = ringbuf->size - ringbuf->tail;
-
- virt = ringbuf->virtual_start + ringbuf->tail;
- rem /= 4;
- while (rem--)
- iowrite32(MI_NOOP, virt++);
-
- ringbuf->tail = 0;
- intel_ring_update_space(ringbuf);
-}
-
int intel_engine_idle(struct intel_engine_cs *engine)
{
struct drm_i915_gem_request *req;
void intel_ring_reserved_space_reserve(struct intel_ringbuffer *ringbuf, int size)
{
- WARN_ON(ringbuf->reserved_size);
- WARN_ON(ringbuf->reserved_in_use);
-
+ GEM_BUG_ON(ringbuf->reserved_size);
ringbuf->reserved_size = size;
}
void intel_ring_reserved_space_cancel(struct intel_ringbuffer *ringbuf)
{
- WARN_ON(ringbuf->reserved_in_use);
-
+ GEM_BUG_ON(!ringbuf->reserved_size);
ringbuf->reserved_size = 0;
- ringbuf->reserved_in_use = false;
}
void intel_ring_reserved_space_use(struct intel_ringbuffer *ringbuf)
{
- WARN_ON(ringbuf->reserved_in_use);
-
- ringbuf->reserved_in_use = true;
- ringbuf->reserved_tail = ringbuf->tail;
+ GEM_BUG_ON(!ringbuf->reserved_size);
+ ringbuf->reserved_size = 0;
}
void intel_ring_reserved_space_end(struct intel_ringbuffer *ringbuf)
{
- WARN_ON(!ringbuf->reserved_in_use);
- if (ringbuf->tail > ringbuf->reserved_tail) {
- WARN(ringbuf->tail > ringbuf->reserved_tail + ringbuf->reserved_size,
- "request reserved size too small: %d vs %d!\n",
- ringbuf->tail - ringbuf->reserved_tail, ringbuf->reserved_size);
- } else {
+ GEM_BUG_ON(ringbuf->reserved_size);
+}
+
+static int wait_for_space(struct drm_i915_gem_request *req, int bytes)
+{
+ struct intel_ringbuffer *ringbuf = req->ringbuf;
+ struct intel_engine_cs *engine = req->engine;
+ struct drm_i915_gem_request *target;
+
+ intel_ring_update_space(ringbuf);
+ if (ringbuf->space >= bytes)
+ return 0;
+
+ /*
+ * Space is reserved in the ringbuffer for finalising the request,
+ * as that cannot be allowed to fail. During request finalisation,
+ * reserved_space is set to 0 to stop the overallocation and the
+ * assumption is that then we never need to wait (which has the
+ * risk of failing with EINTR).
+ *
+ * See also i915_gem_request_alloc() and i915_add_request().
+ */
+ GEM_BUG_ON(!ringbuf->reserved_size);
+
+ list_for_each_entry(target, &engine->request_list, list) {
+ unsigned space;
+
/*
- * The ring was wrapped while the reserved space was in use.
- * That means that some unknown amount of the ring tail was
- * no-op filled and skipped. Thus simply adding the ring size
- * to the tail and doing the above space check will not work.
- * Rather than attempt to track how much tail was skipped,
- * it is much simpler to say that also skipping the sanity
- * check every once in a while is not a big issue.
+ * The request queue is per-engine, so can contain requests
+ * from multiple ringbuffers. Here, we must ignore any that
+ * aren't from the ringbuffer we're considering.
*/
+ if (target->ringbuf != ringbuf)
+ continue;
+
+ /* Would completion of this request free enough space? */
+ space = __intel_ring_space(target->postfix, ringbuf->tail,
+ ringbuf->size);
+ if (space >= bytes)
+ break;
}
- ringbuf->reserved_size = 0;
- ringbuf->reserved_in_use = false;
+ if (WARN_ON(&target->list == &engine->request_list))
+ return -ENOSPC;
+
+ return i915_wait_request(target);
}
-static int __intel_ring_prepare(struct intel_engine_cs *engine, int bytes)
+int intel_ring_begin(struct drm_i915_gem_request *req, int num_dwords)
{
- struct intel_ringbuffer *ringbuf = engine->buffer;
- int remain_usable = ringbuf->effective_size - ringbuf->tail;
+ struct intel_ringbuffer *ringbuf = req->ringbuf;
int remain_actual = ringbuf->size - ringbuf->tail;
- int ret, total_bytes, wait_bytes = 0;
+ int remain_usable = ringbuf->effective_size - ringbuf->tail;
+ int bytes = num_dwords * sizeof(u32);
+ int total_bytes, wait_bytes;
bool need_wrap = false;
- if (ringbuf->reserved_in_use)
- total_bytes = bytes;
- else
- total_bytes = bytes + ringbuf->reserved_size;
+ total_bytes = bytes + ringbuf->reserved_size;
if (unlikely(bytes > remain_usable)) {
/*
*/
wait_bytes = remain_actual + total_bytes;
need_wrap = true;
+ } else if (unlikely(total_bytes > remain_usable)) {
+ /*
+ * The base request will fit but the reserved space
+ * falls off the end. So we don't need an immediate wrap
+ * and only need to effectively wait for the reserved
+ * size space from the start of ringbuffer.
+ */
+ wait_bytes = remain_actual + ringbuf->reserved_size;
} else {
- if (unlikely(total_bytes > remain_usable)) {
- /*
- * The base request will fit but the reserved space
- * falls off the end. So don't need an immediate wrap
- * and only need to effectively wait for the reserved
- * size space from the start of ringbuffer.
- */
- wait_bytes = remain_actual + ringbuf->reserved_size;
- } else if (total_bytes > ringbuf->space) {
- /* No wrapping required, just waiting. */
- wait_bytes = total_bytes;
- }
+ /* No wrapping required, just waiting. */
+ wait_bytes = total_bytes;
}
- if (wait_bytes) {
- ret = ring_wait_for_space(engine, wait_bytes);
+ if (wait_bytes > ringbuf->space) {
+ int ret = wait_for_space(req, wait_bytes);
if (unlikely(ret))
return ret;
- if (need_wrap)
- __wrap_ring_buffer(ringbuf);
+ intel_ring_update_space(ringbuf);
}
- return 0;
-}
+ if (unlikely(need_wrap)) {
+ GEM_BUG_ON(remain_actual > ringbuf->space);
+ GEM_BUG_ON(ringbuf->tail + remain_actual > ringbuf->size);
-int intel_ring_begin(struct drm_i915_gem_request *req,
- int num_dwords)
-{
- struct intel_engine_cs *engine = req->engine;
- int ret;
-
- ret = __intel_ring_prepare(engine, num_dwords * sizeof(uint32_t));
- if (ret)
- return ret;
+ /* Fill the tail with MI_NOOP */
+ memset(ringbuf->virtual_start + ringbuf->tail,
+ 0, remain_actual);
+ ringbuf->tail = 0;
+ ringbuf->space -= remain_actual;
+ }
- engine->buffer->space -= num_dwords * sizeof(uint32_t);
+ ringbuf->space -= bytes;
+ GEM_BUG_ON(ringbuf->space < 0);
return 0;
}
projects / mirror_ubuntu-zesty-kernel.git / commitdiff