After we take first 64KB page table entries. we would make sure
the global memory will not be allocated in the range [0, 64KB].
this is needed, so that we can easily differentiate local/global
address space.
Signed-off-by: Ruiling Song <ruiling.s...@intel.com>
---
src/intel/intel_gpgpu.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/src/intel/intel_gpgpu.c b/src/intel/intel_gpgpu.c
index 110c36f..935595e 100644
--- a/src/intel/intel_gpgpu.c
+++ b/src/intel/intel_gpgpu.c
@@ -953,8 +953,13 @@ intel_gpgpu_state_init(intel_gpgpu_t *gpgpu,
/* make sure aux buffer is page aligned */
size_aux = ALIGN(size_aux, 4096);
+ // we need to take the first 64KB page table entry, so that global memory and
+ // local memory address space are separated. we may need a better way to do
this.
+ if (size_aux < 64*1024) size_aux = 64*1024;
bo = dri_bo_alloc(gpgpu->drv->bufmgr, "AUX_BUFFER", size_aux, 4096);
+ drm_intel_bo_set_softpin_offset(bo, 0);
+
if (!bo || dri_bo_map(bo, 1) != 0) {
fprintf(stderr, "%s:%d: %s.\n", __FILE__, __LINE__, strerror(errno));
if (bo)
--
2.4.1
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