[PATCH 13/53] drm/i915: Add flag to i915_add_request() to skip the cache flush

John.C.Harrison
2015-02-19T17:18:21Z

From: John Harrison <John.C.Harrison@Intel.com>

In order to explcitly track all GPU work (and completely remove the outstanding
lazy request), it is necessary to add extra i915_add_request() calls to various
places. Some of these do not need the implicit cache flush done as part of the
standard batch buffer submission process.

This patch adds a flag to _add_request() to specify whether the flush is
required or not.

For: VIZ-5115
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
---
drivers/gpu/drm/i915/i915_drv.h | 7 +++++--
drivers/gpu/drm/i915/i915_gem.c | 25 +++++++++++--------------
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 2 +-
drivers/gpu/drm/i915/i915_gem_render_state.c | 2 +-
drivers/gpu/drm/i915/intel_lrc.c | 2 +-
5 files changed, 19 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 68d6dec..375d4f9 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2831,9 +2831,12 @@ int __must_check i915_gpu_idle(struct drm_device *dev);
int __must_check i915_gem_suspend(struct drm_device *dev);
int __i915_add_request(struct intel_engine_cs *ring,
struct drm_file *file,
- struct drm_i915_gem_object *batch_obj);
+ struct drm_i915_gem_object *batch_obj,
+ bool flush_caches);
#define i915_add_request(ring) \
- __i915_add_request(ring, NULL, NULL)
+ __i915_add_request(ring, NULL, NULL, true)
+#define i915_add_request_no_flush(ring) \
+ __i915_add_request(ring, NULL, NULL, false)
int __i915_wait_request(struct drm_i915_gem_request *req,
unsigned reset_counter,
bool interruptible,
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index cf959e3..4c29177 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2409,7 +2409,8 @@ i915_gem_get_seqno(struct drm_device *dev, u32 *seqno)

int __i915_add_request(struct intel_engine_cs *ring,
struct drm_file *file,
- struct drm_i915_gem_object *obj)
+ struct drm_i915_gem_object *obj,
+ bool flush_caches)
{
struct drm_i915_private *dev_priv = ring->dev->dev_private;
struct drm_i915_gem_request *request;
@@ -2434,12 +2435,11 @@ int __i915_add_request(struct intel_engine_cs *ring,
* is that the flush _must_ happen before the next request, no matter
* what.
*/
- if (i915.enable_execlists) {
- ret = logical_ring_flush_all_caches(ringbuf, request->ctx);
- if (ret)
- return ret;
- } else {
- ret = intel_ring_flush_all_caches(ring);
+ if (flush_caches) {
+ if (i915.enable_execlists)
+ ret = logical_ring_flush_all_caches(ringbuf, request->ctx);
+ else
+ ret = intel_ring_flush_all_caches(ring);
if (ret)
return ret;
}
@@ -2451,15 +2451,12 @@ int __i915_add_request(struct intel_engine_cs *ring,
*/
request->postfix = intel_ring_get_tail(ringbuf);

- if (i915.enable_execlists) {
+ if (i915.enable_execlists)
ret = ring->emit_request(ringbuf, request);
- if (ret)
- return ret;
- } else {
+ else
ret = ring->add_request(ring);
- if (ret)
- return ret;
- }
+ if (ret)
+ return ret;

request->head = request_start;
request->tail = intel_ring_get_tail(ringbuf);
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index f7c19bc..76f6dcf 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -997,7 +997,7 @@ i915_gem_execbuffer_retire_commands(struct i915_execbuffer_params *params)

/* Add a breadcrumb for the completion of the batch buffer */
return __i915_add_request(params->ring, params->file,
- params->batch_obj);
+ params->batch_obj, true);
}

static int
diff --git a/drivers/gpu/drm/i915/i915_gem_render_state.c b/drivers/gpu/drm/i915/i915_gem_render_state.c
index 521548a..aba39c3 100644
--- a/drivers/gpu/drm/i915/i915_gem_render_state.c
+++ b/drivers/gpu/drm/i915/i915_gem_render_state.c
@@ -173,7 +173,7 @@ int i915_gem_render_state_init(struct intel_engine_cs *ring)

i915_vma_move_to_active(i915_gem_obj_to_ggtt(so.obj), ring);

- ret = __i915_add_request(ring, NULL, so.obj);
+ ret = __i915_add_request(ring, NULL, so.obj, true);
/* __i915_add_request moves object to inactive if it fails */
out:
i915_gem_render_state_fini(&so);
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index bc3809e..4b42346 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1370,7 +1370,7 @@ static int intel_lr_context_render_state_init(struct intel_engine_cs *ring,

i915_vma_move_to_active(i915_gem_obj_to_ggtt(so.obj), ring);

- ret = __i915_add_request(ring, file, so.obj);
+ ret = __i915_add_request(ring, file, so.obj, true);
/* intel_logical_ring_add_request moves object to inactive if it
* fails */
out:
--
1.7.9.5