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vk: Make batch chain code gen-agnostic

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Since the extra dword in MI_BATCH_BUFFER_START added in gen8 is at the
end of the struct, we can emit the gen8 packet on all gens as long as we
set the instruction length correctly.

Signed-off-by: Kristian Høgsberg Kristensen <kristian.h.kristensen@intel.com>
This commit is contained in:
Kristian Høgsberg Kristensen 2015-08-19 14:33:22 -07:00
parent 25ab43ee8c
commit e43fc871be
1 changed files with 14 additions and 0 deletions
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14
src/vulkan/anv_batch_chain.c
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@ -398,7 +398,21 @@ anv_cmd_buffer_current_surface_relocs(struct anv_cmd_buffer *cmd_buffer)
static void
emit_batch_buffer_start(struct anv_batch *batch, struct anv_bo *bo, uint32_t offset)
{
/* In gen8+ the address field grew to two dwords to accomodate 48 bit
* offsets. The high 16 bits are in the last dword, so we can use the gen8
* version in either case, as long as we set the instruction length in the
* header accordingly. This means that we always emit three dwords here
* and all the padding and adjustment we do in this file works for all
* gens.
*/
const uint32_t gen7_length =
GEN7_MI_BATCH_BUFFER_START_length - GEN7_MI_BATCH_BUFFER_START_length_bias;
const uint32_t gen8_length =
GEN8_MI_BATCH_BUFFER_START_length - GEN8_MI_BATCH_BUFFER_START_length_bias;
anv_batch_emit(batch, GEN8_MI_BATCH_BUFFER_START,
.DwordLength = batch->device->info.gen < 8 ? gen7_length : gen8_length,
._2ndLevelBatchBuffer = _1stlevelbatch,
.AddressSpaceIndicator = ASI_PPGTT,
.BatchBufferStartAddress = { bo, offset });