[CI 2/2] drm/i915: Initialize legacy semaphores from engine hw id indexed array

Tvrtko Ursulin
2016-08-16T16:05:34Z

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Build the legacy semaphore initialisation array using the engine
hardware ids instead of driver internal ones. This makes the
static array size dependent only on the number of gen6 semaphore
engines.

Also makes the per-engine semaphore wait and signal tables
hardware id indexed saving some more space.

v2: Refactor I915_GEN6_NUM_ENGINES to GEN6_SEMAPHORE_LAST. (Chris Wilson)
v3: More polish. (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/intel_ringbuffer.c | 55 +++++++++++++++++----------------
drivers/gpu/drm/i915/intel_ringbuffer.h | 7 +++--
2 files changed, 34 insertions(+), 28 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index fa22bd87bab0..12703ea27259 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1337,8 +1337,7 @@ static int gen6_signal(struct drm_i915_gem_request *req)
{
struct intel_ring *ring = req->ring;
struct drm_i915_private *dev_priv = req->i915;
- struct intel_engine_cs *useless;
- enum intel_engine_id id;
+ struct intel_engine_cs *engine;
int ret, num_rings;

num_rings = INTEL_INFO(dev_priv)->num_rings;
@@ -1346,9 +1345,13 @@ static int gen6_signal(struct drm_i915_gem_request *req)
if (ret)
return ret;

- for_each_engine_id(useless, dev_priv, id) {
- i915_reg_t mbox_reg = req->engine->semaphore.mbox.signal[id];
+ for_each_engine(engine, dev_priv) {
+ i915_reg_t mbox_reg;
+
+ if (!(BIT(engine->hw_id) & GEN6_SEMAPHORES_MASK))
+ continue;

+ mbox_reg = req->engine->semaphore.mbox.signal[engine->hw_id];
if (i915_mmio_reg_valid(mbox_reg)) {
intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
intel_ring_emit_reg(ring, mbox_reg);
@@ -1495,7 +1498,7 @@ gen6_ring_sync_to(struct drm_i915_gem_request *req,
u32 dw1 = MI_SEMAPHORE_MBOX |
MI_SEMAPHORE_COMPARE |
MI_SEMAPHORE_REGISTER;
- u32 wait_mbox = signal->engine->semaphore.mbox.wait[req->engine->id];
+ u32 wait_mbox = signal->engine->semaphore.mbox.wait[req->engine->hw_id];
int ret;

WARN_ON(wait_mbox == MI_SEMAPHORE_SYNC_INVALID);
@@ -2569,41 +2572,41 @@ static void intel_ring_init_semaphores(struct drm_i915_private *dev_priv,
* initialized as INVALID. Gen8 will initialize the
* sema between VCS2 and RCS later.
*/
- for (i = 0; i < I915_NUM_ENGINES; i++) {
+ for (i = 0; i < GEN6_NUM_SEMAPHORES; i++) {
static const struct {
u32 wait_mbox;
i915_reg_t mbox_reg;
- } sem_data[I915_NUM_ENGINES][I915_NUM_ENGINES] = {
- [RCS] = {
- [VCS] = { .wait_mbox = MI_SEMAPHORE_SYNC_RV, .mbox_reg = GEN6_VRSYNC },
- [BCS] = { .wait_mbox = MI_SEMAPHORE_SYNC_RB, .mbox_reg = GEN6_BRSYNC },
- [VECS] = { .wait_mbox = MI_SEMAPHORE_SYNC_RVE, .mbox_reg = GEN6_VERSYNC },
+ } sem_data[GEN6_NUM_SEMAPHORES][GEN6_NUM_SEMAPHORES] = {
+ [RCS_HW] = {
+ [VCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_RV, .mbox_reg = GEN6_VRSYNC },
+ [BCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_RB, .mbox_reg = GEN6_BRSYNC },
+ [VECS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_RVE, .mbox_reg = GEN6_VERSYNC },
},
- [VCS] = {
- [RCS] = { .wait_mbox = MI_SEMAPHORE_SYNC_VR, .mbox_reg = GEN6_RVSYNC },
- [BCS] = { .wait_mbox = MI_SEMAPHORE_SYNC_VB, .mbox_reg = GEN6_BVSYNC },
- [VECS] = { .wait_mbox = MI_SEMAPHORE_SYNC_VVE, .mbox_reg = GEN6_VEVSYNC },
+ [VCS_HW] = {
+ [RCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VR, .mbox_reg = GEN6_RVSYNC },
+ [BCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VB, .mbox_reg = GEN6_BVSYNC },
+ [VECS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VVE, .mbox_reg = GEN6_VEVSYNC },
},
- [BCS] = {
- [RCS] = { .wait_mbox = MI_SEMAPHORE_SYNC_BR, .mbox_reg = GEN6_RBSYNC },
- [VCS] = { .wait_mbox = MI_SEMAPHORE_SYNC_BV, .mbox_reg = GEN6_VBSYNC },
- [VECS] = { .wait_mbox = MI_SEMAPHORE_SYNC_BVE, .mbox_reg = GEN6_VEBSYNC },
+ [BCS_HW] = {
+ [RCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_BR, .mbox_reg = GEN6_RBSYNC },
+ [VCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_BV, .mbox_reg = GEN6_VBSYNC },
+ [VECS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_BVE, .mbox_reg = GEN6_VEBSYNC },
},
- [VECS] = {
- [RCS] = { .wait_mbox = MI_SEMAPHORE_SYNC_VER, .mbox_reg = GEN6_RVESYNC },
- [VCS] = { .wait_mbox = MI_SEMAPHORE_SYNC_VEV, .mbox_reg = GEN6_VVESYNC },
- [BCS] = { .wait_mbox = MI_SEMAPHORE_SYNC_VEB, .mbox_reg = GEN6_BVESYNC },
+ [VECS_HW] = {
+ [RCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VER, .mbox_reg = GEN6_RVESYNC },
+ [VCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VEV, .mbox_reg = GEN6_VVESYNC },
+ [BCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VEB, .mbox_reg = GEN6_BVESYNC },
},
};
u32 wait_mbox;
i915_reg_t mbox_reg;

- if (i == engine->id || i == VCS2) {
+ if (i == engine->hw_id) {
wait_mbox = MI_SEMAPHORE_SYNC_INVALID;
mbox_reg = GEN6_NOSYNC;
} else {
- wait_mbox = sem_data[engine->id][i].wait_mbox;
- mbox_reg = sem_data[engine->id][i].mbox_reg;
+ wait_mbox = sem_data[engine->hw_id][i].wait_mbox;
+ mbox_reg = sem_data[engine->hw_id][i].mbox_reg;
}

engine->semaphore.mbox.wait[i] = wait_mbox;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 9d723c24eeff..86612d502c65 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -278,11 +278,14 @@ struct intel_engine_cs {
u32 sync_seqno[I915_NUM_ENGINES-1];

union {
+#define GEN6_SEMAPHORE_LAST VECS_HW
+#define GEN6_NUM_SEMAPHORES (GEN6_SEMAPHORE_LAST + 1)
+#define GEN6_SEMAPHORES_MASK GENMASK(GEN6_SEMAPHORE_LAST, 0)
struct {
/* our mbox written by others */
- u32 wait[I915_NUM_ENGINES];
+ u32 wait[GEN6_NUM_SEMAPHORES];
/* mboxes this ring signals to */
- i915_reg_t signal[I915_NUM_ENGINES];
+ i915_reg_t signal[GEN6_NUM_SEMAPHORES];
} mbox;
u64 signal_ggtt[I915_NUM_ENGINES];
};
--
1.9.1