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util: add os_map_memory_fd_placed for placed mapping support

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This completes the opaque fd api coverage, and is needed by lavapipe for
sparse binding support with opaque fd external memory.

Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38074>
This commit is contained in:
Yiwei Zhang 2025-10-27 20:39:15 -07:00 • committed by Marge Bot
parent 743b9a52d9
commit 8f7543e450
2 changed files with 25 additions and 0 deletions
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19
src/util/os_memory_fd.c
View file

@ -105,6 +105,25 @@ os_import_memory_fd(int fd, void **ptr, uint64_t *size, char const *driver_id)
return true;
}
/**
* Map memory from a file descriptor at placed address
*/
bool
os_map_memory_fd_placed(int fd, void *addr, uint64_t size, uint64_t offset,
char const *driver_id)
{
struct memory_header header;
if (!get_fd_header(fd, &header, driver_id))
return false;
if (header.size - header.offset < size + offset)
return false;
return mmap(addr, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, fd,
offset + header.offset) != MAP_FAILED;
}
/**
* Return memory on given byte alignment
*/

6
src/util/os_memory_fd.h
View file

@ -40,6 +40,12 @@
bool
os_import_memory_fd(int fd, void **ptr, uint64_t *size, char const *driver_id);
/**
* Map memory from a file descriptor at placed address
*/
bool
os_map_memory_fd_placed(int fd, void *addr, uint64_t size, uint64_t offset, char const *driver_id);
/**
* Return memory on given byte alignment
*/