From ad776f8b09d66e0145479fdbde2a710e5892441f Mon Sep 17 00:00:00 2001 From: Ben Widawsky Date: Tue, 28 May 2013 19:22:18 -0700 Subject: [PATCH] drm/i915: Semaphore MBOX update generalization This replaces the existing MBOX update code with a more generalized calculation for emitting mbox updates. We also create a sentinel for doing the updates so we can more abstractly deal with the rings. When doing MBOX updates the code must be aware of the /other/ rings. Until now the platforms which supported semaphores had a fixed number of rings and so it made sense for the code to be very specialized (hardcoded). The patch does contain a functional change, but should have no behavioral changes. Signed-off-by: Ben Widawsky Reviewed-by: Damien Lespiau Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_reg.h | 1 + drivers/gpu/drm/i915/intel_ringbuffer.c | 43 +++++++++++++++++-------- drivers/gpu/drm/i915/intel_ringbuffer.h | 5 ++- 3 files changed, 34 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 6579d0c0d2f1..19f8e51d2bdc 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -593,6 +593,7 @@ #define GEN6_VRSYNC (RING_SYNC_1(GEN6_BSD_RING_BASE)) #define GEN6_VBSYNC (RING_SYNC_0(GEN6_BSD_RING_BASE)) #define GEN6_BRSYNC (RING_SYNC_0(BLT_RING_BASE)) +#define GEN6_NOSYNC 0 #define GEN6_BVSYNC (RING_SYNC_1(BLT_RING_BASE)) #define RING_MAX_IDLE(base) ((base)+0x54) #define RING_HWS_PGA(base) ((base)+0x80) diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 2d2a3622639c..5df179127e8b 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -582,9 +582,16 @@ static void update_mboxes(struct intel_ring_buffer *ring, u32 mmio_offset) { +/* NB: In order to be able to do semaphore MBOX updates for varying number + * of rings, it's easiest if we round up each individual update to a + * multiple of 2 (since ring updates must always be a multiple of 2) + * even though the actual update only requires 3 dwords. + */ +#define MBOX_UPDATE_DWORDS 4 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1)); intel_ring_emit(ring, mmio_offset); intel_ring_emit(ring, ring->outstanding_lazy_request); + intel_ring_emit(ring, MI_NOOP); } /** @@ -599,19 +606,24 @@ update_mboxes(struct intel_ring_buffer *ring, static int gen6_add_request(struct intel_ring_buffer *ring) { - u32 mbox1_reg; - u32 mbox2_reg; - int ret; + struct drm_device *dev = ring->dev; + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_ring_buffer *useless; + int i, ret; - ret = intel_ring_begin(ring, 10); + ret = intel_ring_begin(ring, ((I915_NUM_RINGS-1) * + MBOX_UPDATE_DWORDS) + + 4); if (ret) return ret; +#undef MBOX_UPDATE_DWORDS - mbox1_reg = ring->signal_mbox[0]; - mbox2_reg = ring->signal_mbox[1]; + for_each_ring(useless, dev_priv, i) { + u32 mbox_reg = ring->signal_mbox[i]; + if (mbox_reg != GEN6_NOSYNC) + update_mboxes(ring, mbox_reg); + } - update_mboxes(ring, mbox1_reg); - update_mboxes(ring, mbox2_reg); intel_ring_emit(ring, MI_STORE_DWORD_INDEX); intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT); intel_ring_emit(ring, ring->outstanding_lazy_request); @@ -1674,8 +1686,9 @@ int intel_init_render_ring_buffer(struct drm_device *dev) ring->semaphore_register[RCS] = MI_SEMAPHORE_SYNC_INVALID; ring->semaphore_register[VCS] = MI_SEMAPHORE_SYNC_RV; ring->semaphore_register[BCS] = MI_SEMAPHORE_SYNC_RB; - ring->signal_mbox[0] = GEN6_VRSYNC; - ring->signal_mbox[1] = GEN6_BRSYNC; + ring->signal_mbox[RCS] = GEN6_NOSYNC; + ring->signal_mbox[VCS] = GEN6_VRSYNC; + ring->signal_mbox[BCS] = GEN6_BRSYNC; } else if (IS_GEN5(dev)) { ring->add_request = pc_render_add_request; ring->flush = gen4_render_ring_flush; @@ -1833,8 +1846,9 @@ int intel_init_bsd_ring_buffer(struct drm_device *dev) ring->semaphore_register[RCS] = MI_SEMAPHORE_SYNC_VR; ring->semaphore_register[VCS] = MI_SEMAPHORE_SYNC_INVALID; ring->semaphore_register[BCS] = MI_SEMAPHORE_SYNC_VB; - ring->signal_mbox[0] = GEN6_RVSYNC; - ring->signal_mbox[1] = GEN6_BVSYNC; + ring->signal_mbox[RCS] = GEN6_RVSYNC; + ring->signal_mbox[VCS] = GEN6_NOSYNC; + ring->signal_mbox[BCS] = GEN6_BVSYNC; } else { ring->mmio_base = BSD_RING_BASE; ring->flush = bsd_ring_flush; @@ -1879,8 +1893,9 @@ int intel_init_blt_ring_buffer(struct drm_device *dev) ring->semaphore_register[RCS] = MI_SEMAPHORE_SYNC_BR; ring->semaphore_register[VCS] = MI_SEMAPHORE_SYNC_BV; ring->semaphore_register[BCS] = MI_SEMAPHORE_SYNC_INVALID; - ring->signal_mbox[0] = GEN6_RBSYNC; - ring->signal_mbox[1] = GEN6_VBSYNC; + ring->signal_mbox[RCS] = GEN6_RBSYNC; + ring->signal_mbox[VCS] = GEN6_VBSYNC; + ring->signal_mbox[BCS] = GEN6_NOSYNC; ring->init = init_ring_common; return intel_init_ring_buffer(dev, ring); diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h index 24268fbe6855..f55d92eb6c2a 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.h +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h @@ -105,9 +105,12 @@ struct intel_ring_buffer { int (*sync_to)(struct intel_ring_buffer *ring, struct intel_ring_buffer *to, u32 seqno); + /* our mbox written by others */ u32 semaphore_register[I915_NUM_RINGS]; - u32 signal_mbox[2]; /* mboxes this ring signals to */ + /* mboxes this ring signals to */ + u32 signal_mbox[I915_NUM_RINGS]; + /** * List of objects currently involved in rendering from the * ringbuffer. -- 2.30.2