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venus: implement vn_buffer_get_max_buffer_size

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This change estimates the max_buffer_size with quick sort. Try to
avoid some traffic upon device creation time, but not worth adding a
buffer simple create api to avoid the extra requirement query traffic
since this is temporary.

Signed-off-by: Yiwei Zhang <zzyiwei@chromium.org>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Ryan Neph <ryanneph@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13428>
This commit is contained in:
Yiwei Zhang 2021-10-18 18:03:11 +00:00 • committed by Marge Bot
parent 13f2e50aee
commit a74f2495ca
1 changed files with 27 additions and 1 deletions
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28
src/virtio/vulkan/vn_buffer.c
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@ -43,7 +43,33 @@ static VkResult
vn_buffer_get_max_buffer_size(struct vn_device *dev,
uint64_t *out_max_buffer_size)
{
*out_max_buffer_size = 0;
/* XXX use VK_KHR_maintenance4 when available */
const VkAllocationCallbacks *alloc = &dev->base.base.alloc;
VkDevice dev_handle = vn_device_to_handle(dev);
VkBuffer buf_handle;
VkBufferCreateInfo create_info = {
.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
.usage = VK_BUFFER_USAGE_TRANSFER_SRC_BIT,
.sharingMode = VK_SHARING_MODE_EXCLUSIVE,
};
uint64_t max_buffer_size = 0;
uint8_t begin = 0;
uint8_t end = 64;
while (begin <= end) {
uint8_t mid = (begin + end) >> 1;
create_info.size = 1 << mid;
if (vn_CreateBuffer(dev_handle, &create_info, alloc, &buf_handle) ==
VK_SUCCESS) {
vn_DestroyBuffer(dev_handle, buf_handle, alloc);
max_buffer_size = create_info.size;
begin = mid + 1;
} else {
end = mid - 1;
}
}
*out_max_buffer_size = max_buffer_size;
return VK_SUCCESS;
}