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drm/i915/bdw: implement semaphore wait

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Semaphore waits use a new instruction, MI_SEMAPHORE_WAIT. The seqno to
wait on is all well defined by the table in the previous patch. There is
nothing else different from previous GEN's semaphore synchronization
code.

v2: Update macros to not require the other ring's ring->id (Chris)

v3: Add missing VCS2 gen8_ring_wait init besides
    s/ring_buffer/engine_cs (Rodrigo)

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky 2014-06-30 09:53:38 -07:00 committed by Daniel Vetter
parent 3e78998a58
commit 5ee426ca13
2 changed files with 33 additions and 5 deletions
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3
drivers/gpu/drm/i915/i915_reg.h
View file

@ -268,6 +268,9 @@
#define MI_RESTORE_INHIBIT (1<<0)
#define MI_SEMAPHORE_SIGNAL MI_INSTR(0x1b, 0) /* GEN8+ */
#define MI_SEMAPHORE_TARGET(engine) ((engine)<<15)
#define MI_SEMAPHORE_WAIT MI_INSTR(0x1c, 2) /* GEN8+ */
#define MI_SEMAPHORE_POLL (1<<15)
#define MI_SEMAPHORE_SAD_GTE_SDD (1<<12)
#define MI_STORE_DWORD_IMM MI_INSTR(0x20, 1)
#define MI_MEM_VIRTUAL (1 << 22) /* 965+ only */
#define MI_STORE_DWORD_INDEX MI_INSTR(0x21, 1)

35
drivers/gpu/drm/i915/intel_ringbuffer.c
View file

@ -832,6 +832,31 @@ static inline bool i915_gem_has_seqno_wrapped(struct drm_device *dev,
* @signaller - ring which has, or will signal
* @seqno - seqno which the waiter will block on
*/
static int
gen8_ring_sync(struct intel_engine_cs *waiter,
struct intel_engine_cs *signaller,
u32 seqno)
{
struct drm_i915_private *dev_priv = waiter->dev->dev_private;
int ret;
ret = intel_ring_begin(waiter, 4);
if (ret)
return ret;
intel_ring_emit(waiter, MI_SEMAPHORE_WAIT |
MI_SEMAPHORE_GLOBAL_GTT |
MI_SEMAPHORE_SAD_GTE_SDD);
intel_ring_emit(waiter, seqno);
intel_ring_emit(waiter,
lower_32_bits(GEN8_WAIT_OFFSET(waiter, signaller->id)));
intel_ring_emit(waiter,
upper_32_bits(GEN8_WAIT_OFFSET(waiter, signaller->id)));
intel_ring_advance(waiter);
return 0;
}
static int
gen6_ring_sync(struct intel_engine_cs *waiter,
struct intel_engine_cs *signaller,
@ -2056,7 +2081,7 @@ int intel_init_render_ring_buffer(struct drm_device *dev)
ring->set_seqno = ring_set_seqno;
if (i915_semaphore_is_enabled(dev)) {
WARN_ON(!dev_priv->semaphore_obj);
ring->semaphore.sync_to = gen6_ring_sync;
ring->semaphore.sync_to = gen8_ring_sync;
ring->semaphore.signal = gen8_rcs_signal;
GEN8_RING_SEMAPHORE_INIT;
}
@ -2267,7 +2292,7 @@ int intel_init_bsd_ring_buffer(struct drm_device *dev)
ring->dispatch_execbuffer =
gen8_ring_dispatch_execbuffer;
if (i915_semaphore_is_enabled(dev)) {
ring->semaphore.sync_to = gen6_ring_sync;
ring->semaphore.sync_to = gen8_ring_sync;
ring->semaphore.signal = gen8_xcs_signal;
GEN8_RING_SEMAPHORE_INIT;
}
@ -2343,8 +2368,8 @@ int intel_init_bsd2_ring_buffer(struct drm_device *dev)
ring->irq_put = gen8_ring_put_irq;
ring->dispatch_execbuffer =
gen8_ring_dispatch_execbuffer;
ring->semaphore.sync_to = gen6_ring_sync;
if (i915_semaphore_is_enabled(dev)) {
ring->semaphore.sync_to = gen8_ring_sync;
ring->semaphore.signal = gen8_xcs_signal;
GEN8_RING_SEMAPHORE_INIT;
}
@ -2374,7 +2399,7 @@ int intel_init_blt_ring_buffer(struct drm_device *dev)
ring->irq_put = gen8_ring_put_irq;
ring->dispatch_execbuffer = gen8_ring_dispatch_execbuffer;
if (i915_semaphore_is_enabled(dev)) {
ring->semaphore.sync_to = gen6_ring_sync;
ring->semaphore.sync_to = gen8_ring_sync;
ring->semaphore.signal = gen8_xcs_signal;
GEN8_RING_SEMAPHORE_INIT;
}
@ -2432,7 +2457,7 @@ int intel_init_vebox_ring_buffer(struct drm_device *dev)
ring->irq_put = gen8_ring_put_irq;
ring->dispatch_execbuffer = gen8_ring_dispatch_execbuffer;
if (i915_semaphore_is_enabled(dev)) {
ring->semaphore.sync_to = gen6_ring_sync;
ring->semaphore.sync_to = gen8_ring_sync;
ring->semaphore.signal = gen8_xcs_signal;
GEN8_RING_SEMAPHORE_INIT;
}