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venus: only preserve 12 bits for VkBufferCreateFlagBits

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Save more bits to prepare for VkBufferUsageFlags2CreateInfo.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39339>
This commit is contained in:
Yiwei Zhang 2026-01-15 20:38:26 -08:00 • committed by Marge Bot
parent 197cb437cd
commit 25970096d4
1 changed files with 8 additions and 6 deletions
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14
src/virtio/vulkan/vn_buffer.c
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@ -19,7 +19,7 @@
/* buffer commands */
static inline uint64_t
static uint64_t
vn_buffer_get_cache_index(const VkBufferCreateInfo *create_info,
struct vn_buffer_reqs_cache *cache)
{
@ -29,13 +29,15 @@ vn_buffer_get_cache_index(const VkBufferCreateInfo *create_info,
*
* Combine sharing mode, flags and usage bits to form a unique index.
*
* Btw, we assume VkBufferCreateFlagBits won't exhaust all 32bits, at least
* no earlier than VkBufferUsageFlagBits.
*
* TODO: extend cache to cover VkBufferUsageFlags2CreateInfo (introduced in
* VK_KHR_maintenance5 and promoted to 1.4).
*/
assert(!(create_info->flags & 0x80000000));
/* Only 7 bits are taken for VkBufferCreateFlagBits as of spec 1.4.339. We
* preserve 12 bits for the create flags.
*/
if (create_info->flags & 0xFFFFF000)
return 0;
const bool is_exclusive =
create_info->sharingMode == VK_SHARING_MODE_EXCLUSIVE;
@ -45,7 +47,7 @@ vn_buffer_get_cache_index(const VkBufferCreateInfo *create_info,
if (create_info->size <= cache->max_buffer_size &&
create_info->pNext == NULL && (is_exclusive || is_concurrent)) {
return (uint64_t)is_concurrent << 63 |
(uint64_t)create_info->flags << 32 | create_info->usage;
(uint64_t)create_info->flags << 51 | create_info->usage;
}
/* index being zero suggests uncachable since usage must not be zero */