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i965: Fix BRW_MEMZONE_LOW_4G heap size.

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The STATE_BASE_ADDRESS "Size" fields can only hold 0xfffff in pages,
and 0xfffff * 4096 = 4294963200, which is 1 page shy of 4GB.

So we can't use the top page.

Fixes: 01058a5522 i965: Add virtual memory allocator infrastructure to brw_bufmgr.
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Kenneth Graunke 2019-04-26 17:09:11 -07:00
parent e8c74a1e16
commit 15f134c628
1 changed files with 4 additions and 1 deletions
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5
src/mesa/drivers/dri/i965/brw_bufmgr.c
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@ -1717,6 +1717,9 @@ brw_bufmgr_init(struct gen_device_info *devinfo, int fd)
const uint64_t _4GB = 4ull << 30;
/* The STATE_BASE_ADDRESS size field can only hold 1 page shy of 4GB */
const uint64_t _4GB_minus_1 = _4GB - PAGE_SIZE;
if (devinfo->gen >= 8 && gtt_size > _4GB) {
bufmgr->initial_kflags |= EXEC_OBJECT_SUPPORTS_48B_ADDRESS;
@ -1726,7 +1729,7 @@ brw_bufmgr_init(struct gen_device_info *devinfo, int fd)
bufmgr->initial_kflags |= EXEC_OBJECT_PINNED;
util_vma_heap_init(&bufmgr->vma_allocator[BRW_MEMZONE_LOW_4G],
PAGE_SIZE, _4GB);
PAGE_SIZE, _4GB_minus_1);
util_vma_heap_init(&bufmgr->vma_allocator[BRW_MEMZONE_OTHER],
1 * _4GB, gtt_size - 1 * _4GB);
} else if (devinfo->gen >= 10) {