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drm/i915: Record space required for breadcrumb emission 

In the next patch, we will use deferred breadcrumb emission. That requires
reserving sufficient space in the ringbuffer to emit the breadcrumb, which
first requires us to know how large the breadcrumb is.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161028125858.23563-28-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-10-28 13:58:51 +01:00
parent 9b81d556b1
commit 98f29e8d90
4 changed files with 35 additions and 2 deletions
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1
drivers/gpu/drm/i915/i915_gem_request.c
View File

@ -434,6 +434,7 @@ i915_gem_request_alloc(struct intel_engine_cs *engine,
* away, e.g. because a GPU scheduler has deferred it.
*/
req->reserved_space = MIN_SPACE_FOR_ADD_REQUEST;
GEM_BUG_ON(req->reserved_space < engine->emit_breadcrumb_sz);
if (i915.enable_execlists)
ret = intel_logical_ring_alloc_request_extras(req);

6
drivers/gpu/drm/i915/intel_lrc.c
View File

@ -1590,6 +1590,8 @@ static int gen8_emit_breadcrumb(struct drm_i915_gem_request *request)
return intel_logical_ring_advance(request);
}
static const int gen8_emit_breadcrumb_sz = 6 + WA_TAIL_DWORDS;
static int gen8_emit_breadcrumb_render(struct drm_i915_gem_request *request)
{
struct intel_ring *ring = request->ring;
@ -1621,6 +1623,8 @@ static int gen8_emit_breadcrumb_render(struct drm_i915_gem_request *request)
return intel_logical_ring_advance(request);
}
static const int gen8_emit_breadcrumb_render_sz = 8 + WA_TAIL_DWORDS;
static int gen8_init_rcs_context(struct drm_i915_gem_request *req)
{
int ret;
@ -1695,6 +1699,7 @@ logical_ring_default_vfuncs(struct intel_engine_cs *engine)
engine->reset_hw = reset_common_ring;
engine->emit_flush = gen8_emit_flush;
engine->emit_breadcrumb = gen8_emit_breadcrumb;
engine->emit_breadcrumb_sz = gen8_emit_breadcrumb_sz;
engine->submit_request = execlists_submit_request;
engine->irq_enable = gen8_logical_ring_enable_irq;
@ -1817,6 +1822,7 @@ int logical_render_ring_init(struct intel_engine_cs *engine)
engine->init_context = gen8_init_rcs_context;
engine->emit_flush = gen8_emit_flush_render;
engine->emit_breadcrumb = gen8_emit_breadcrumb_render;
engine->emit_breadcrumb_sz = gen8_emit_breadcrumb_render_sz;
ret = intel_engine_create_scratch(engine, 4096);
if (ret)

29
drivers/gpu/drm/i915/intel_ringbuffer.c
View File

@ -1348,6 +1348,8 @@ static int i9xx_emit_breadcrumb(struct drm_i915_gem_request *req)
return 0;
}
static const int i9xx_emit_breadcrumb_sz = 4;
/**
* gen6_sema_emit_breadcrumb - Update the semaphore mailbox registers
*
@ -1401,6 +1403,8 @@ static int gen8_render_emit_breadcrumb(struct drm_i915_gem_request *req)
return 0;
}
static const int gen8_render_emit_breadcrumb_sz = 8;
/**
* intel_ring_sync - sync the waiter to the signaller on seqno
*
@ -2638,8 +2642,21 @@ static void intel_ring_default_vfuncs(struct drm_i915_private *dev_priv,
engine->reset_hw = reset_ring_common;
engine->emit_breadcrumb = i9xx_emit_breadcrumb;
if (i915.semaphores)
engine->emit_breadcrumb_sz = i9xx_emit_breadcrumb_sz;
if (i915.semaphores) {
int num_rings;
engine->emit_breadcrumb = gen6_sema_emit_breadcrumb;
num_rings = hweight32(INTEL_INFO(dev_priv)->ring_mask) - 1;
if (INTEL_GEN(dev_priv) >= 8) {
engine->emit_breadcrumb_sz += num_rings * 6;
} else {
engine->emit_breadcrumb_sz += num_rings * 3;
if (num_rings & 1)
engine->emit_breadcrumb_sz++;
}
}
engine->submit_request = i9xx_submit_request;
if (INTEL_GEN(dev_priv) >= 8)
@ -2667,9 +2684,17 @@ int intel_init_render_ring_buffer(struct intel_engine_cs *engine)
if (INTEL_GEN(dev_priv) >= 8) {
engine->init_context = intel_rcs_ctx_init;
engine->emit_breadcrumb = gen8_render_emit_breadcrumb;
engine->emit_breadcrumb_sz = gen8_render_emit_breadcrumb_sz;
engine->emit_flush = gen8_render_ring_flush;
if (i915.semaphores)
if (i915.semaphores) {
int num_rings;
engine->semaphore.signal = gen8_rcs_signal;
num_rings =
hweight32(INTEL_INFO(dev_priv)->ring_mask) - 1;
engine->emit_breadcrumb_sz += num_rings * 6;
}
} else if (INTEL_GEN(dev_priv) >= 6) {
engine->init_context = intel_rcs_ctx_init;
engine->emit_flush = gen7_render_ring_flush;

1
drivers/gpu/drm/i915/intel_ringbuffer.h
View File

@ -256,6 +256,7 @@ struct intel_engine_cs {
#define I915_DISPATCH_PINNED BIT(1)
#define I915_DISPATCH_RS BIT(2)
int (*emit_breadcrumb)(struct drm_i915_gem_request *req);
int emit_breadcrumb_sz;
/* Pass the request to the hardware queue (e.g. directly into
* the legacy ringbuffer or to the end of an execlist).