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iris: Allow non-page-aligned userptr 

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15779>
This commit is contained in:
Jason Ekstrand 2022-04-06 14:22:23 -05:00 committed by Marge Bot
parent 27697ac20c
commit 5fd2f462fb
1 changed files with 15 additions and 2 deletions
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17
src/gallium/drivers/iris/iris_resource.c
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@ -1177,11 +1177,24 @@ iris_resource_from_user_memory(struct pipe_screen *pscreen,
assert(templ->target == PIPE_BUFFER);
/* The userptr ioctl only works on whole pages. Because we know that
* things will exist in memory at a page granularity, we can expand the
* range given by the client into the whole number of pages and use an
* offset on the resource to make it looks like it starts at the user's
* pointer.
*/
size_t page_size = getpagesize();
assert(util_is_power_of_two_nonzero(page_size));
size_t offset = (uintptr_t)user_memory & (page_size - 1);
void *mem_start = (char *)user_memory - offset;
size_t mem_size = offset + templ->width0;
mem_size = ALIGN_NPOT(mem_size, page_size);
res->internal_format = templ->format;
res->base.is_user_ptr = true;
res->bo = iris_bo_create_userptr(bufmgr, "user",
user_memory, templ->width0,
res->bo = iris_bo_create_userptr(bufmgr, "user", mem_start, mem_size,
IRIS_MEMZONE_OTHER);
res->offset = offset;
if (!res->bo) {
iris_resource_destroy(pscreen, &res->base.b);
return NULL;