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drm/i915: Assert that the request->tail is always qword aligned 

The hardware requires that the tail pointer only advance in qword units,
so assert that the value we write is aligned to qwords, and similarly
enforce this restriction onto the request->tail.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170217163833.731-1-chris@chris-wilson.co.uk
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
This commit is contained in:
Chris Wilson 2017-02-17 16:38:33 +00:00
parent 8d8c386c38
commit 944a36d472
2 changed files with 7 additions and 0 deletions
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4
drivers/gpu/drm/i915/intel_lrc.c
View File

@ -325,6 +325,7 @@ static u64 execlists_update_context(struct drm_i915_gem_request *rq)
rq->ctx->ppgtt ?: rq->i915->mm.aliasing_ppgtt;
u32 *reg_state = ce->lrc_reg_state;
GEM_BUG_ON(!IS_ALIGNED(rq->tail, 8));
reg_state[CTX_RING_TAIL+1] = rq->tail;
/* True 32b PPGTT with dynamic page allocation: update PDP
@ -1283,6 +1284,7 @@ static void reset_common_ring(struct intel_engine_cs *engine,
/* Reset WaIdleLiteRestore:bdw,skl as well */
request->tail = request->wa_tail - WA_TAIL_DWORDS * sizeof(u32);
GEM_BUG_ON(!IS_ALIGNED(request->tail, 8));
}
static int intel_logical_ring_emit_pdps(struct drm_i915_gem_request *req)
@ -1494,6 +1496,7 @@ static void gen8_emit_breadcrumb(struct drm_i915_gem_request *request, u32 *cs)
*cs++ = MI_USER_INTERRUPT;
*cs++ = MI_NOOP;
request->tail = intel_ring_offset(request, cs);
GEM_BUG_ON(!IS_ALIGNED(request->tail, 8));
gen8_emit_wa_tail(request, cs);
}
@ -1521,6 +1524,7 @@ static void gen8_emit_breadcrumb_render(struct drm_i915_gem_request *request,
*cs++ = MI_USER_INTERRUPT;
*cs++ = MI_NOOP;
request->tail = intel_ring_offset(request, cs);
GEM_BUG_ON(!IS_ALIGNED(request->tail, 8));
gen8_emit_wa_tail(request, cs);
}

3
drivers/gpu/drm/i915/intel_ringbuffer.c
View File

@ -784,6 +784,7 @@ static void i9xx_submit_request(struct drm_i915_gem_request *request)
i915_gem_request_submit(request);
GEM_BUG_ON(!IS_ALIGNED(request->tail, 8));
I915_WRITE_TAIL(request->engine, request->tail);
}
@ -795,6 +796,7 @@ static void i9xx_emit_breadcrumb(struct drm_i915_gem_request *req, u32 *cs)
*cs++ = MI_USER_INTERRUPT;
req->tail = intel_ring_offset(req, cs);
GEM_BUG_ON(!IS_ALIGNED(req->tail, 8));
}
static const int i9xx_emit_breadcrumb_sz = 4;
@ -833,6 +835,7 @@ static void gen8_render_emit_breadcrumb(struct drm_i915_gem_request *req,
*cs++ = MI_NOOP;
req->tail = intel_ring_offset(req, cs);
GEM_BUG_ON(!IS_ALIGNED(req->tail, 8));
}
static const int gen8_render_emit_breadcrumb_sz = 8;