kernel/linux.git/drivers/gpu/drm/ttm/Makefile, branch v6.18.22

drm/ttm: Provide a shmem backup implementation

2025-03-05T16:08:59+00:00

Provide a standalone shmem backup implementation. Given the ttm_backup interface, this could later on be extended to providing other backup implementation than shmem, with one use-case being GPU swapout to a user-provided fd. v5: - Fix a UAF. (kernel test robot, Dan Carptenter) v6: - Rename ttm_backup_shmem_copy_page() function argument (Matthew Brost) - Add some missing documentation v8: - Use folio_file_page to get to the page we want to writeback instead of using the first page of the folio. v13: - Remove the base class abstraction (Christian König) - Include ttm_backup_bytes_avail(). v14: - Fix kerneldoc for ttm_backup_bytes_avail() (0-day) - Work around casting of __randomize_layout struct pointer (0-day) v15: - Return negative error code from ttm_backup_backup_page() (Christian König) - Doc fixes. (Christian König). Cc: Christian König Cc: Somalapuram Amaranath Cc: Matthew Brost Cc: Signed-off-by: Thomas Hellström Reviewed-by: Matthew Brost Reviewed-by: Christian König Link: https://lore.kernel.org/intel-xe/20250305092220.123405-2-thomas.hellstrom@linux.intel.com

drm/ttm: Introduce KUnit test

2023-08-09T16:04:22+00:00

Add the initial version of unit tests for ttm_device struct, together with helper functions. Signed-off-by: Karolina Stolarek Reviewed-by: Christian König Link: https://patchwork.freedesktop.org/patch/msgid/3d1cc45c8a0cf536b92a850e0025f6c555de0169.1691487006.git.karolina.stolarek@intel.com Signed-off-by: Christian König

drm/ttm: add ttm_sys_manager v3

2021-05-03T10:50:41+00:00

Add a separate manager for the system domain and make function tables mandatory. v2: debug is still optional v3: return void during init Signed-off-by: Christian König Reviewed-by: Matthew Auld Link: https://patchwork.freedesktop.org/patch/msgid/20210430092508.60710-1-christian.koenig@amd.com

drm/ttm: move memory accounting into vmwgfx v4

2021-02-09T16:27:33+00:00

This is just another feature which is only used by VMWGFX, so move it into the driver instead. I've tried to add the accounting sysfs file to the kobject of the drm minor, but I'm not 100% sure if this works as expected. v2: fix typo in KFD and avoid 64bit divide v3: fix init order in VMWGFX v4: use pdev sysfs reference instead of drm Signed-off-by: Christian König Reviewed-by: Zack Rusin (v3) Tested-by: Nirmoy Das Link: https://patchwork.freedesktop.org/patch/msgid/20210208133226.36955-2-christian.koenig@amd.com

drm/ttm: device naming cleanup

2021-01-21T13:51:45+00:00

Rename ttm_bo_device to ttm_device. Rename ttm_bo_driver to ttm_device_funcs. Rename ttm_bo_global to ttm_global. Move global and device related functions to ttm_device.[ch]. No functional change. Signed-off-by: Christian König Acked-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/415222/

drm/ttm: nuke old page allocator

2020-10-29T14:57:57+00:00

Not used any more. Signed-off-by: Christian König Reviewed-by: Dave Airlie Reviewed-by: Madhav Chauhan Tested-by: Huang Rui Link: https://patchwork.freedesktop.org/patch/397087/?series=83051&rev=1

drm/ttm: new TT backend allocation pool v3

2020-10-29T14:52:51+00:00

This replaces the spaghetti code in the two existing page pools. First of all depending on the allocation size it is between 3 (1GiB) and 5 (1MiB) times faster than the old implementation. It makes better use of buddy pages to allow for larger physical contiguous allocations which should result in better TLB utilization at least for amdgpu. Instead of a completely braindead approach of filling the pool with one CPU while another one is trying to shrink it we only give back freed pages. This also results in much less locking contention and a trylock free MM shrinker callback, so we can guarantee that pages are given back to the system when needed. Downside of this is that it takes longer for many small allocations until the pool is filled up. We could address this, but I couldn't find an use case where this actually matters. We also don't bother freeing large chunks of pages any more since the CPU overhead in that path isn't really that important. The sysfs files are replaced with a single module parameter, allowing users to override how many pages should be globally pooled in TTM. This unfortunately breaks the UAPI slightly, but as far as we know nobody ever depended on this. Zeroing memory coming from the pool was handled inconsistently. The alloc_pages() based pool was zeroing it, the dma_alloc_attr() based one wasn't. For now the new implementation isn't zeroing pages from the pool either and only sets the __GFP_ZERO flag when necessary. The implementation has only 768 lines of code compared to the over 2600 of the old one, and also allows for saving quite a bunch of code in the drivers since we don't need specialized handling there any more based on kernel config. Additional to all of that there was a neat bug with IOMMU, coherent DMA mappings and huge pages which is now fixed in the new code as well. v2: make ttm_pool_apply_caching static as reported by the kernel bot, add some more checks v3: fix some more checkpatch.pl warnings Signed-off-by: Christian König Reviewed-by: Dave Airlie Reviewed-by: Madhav Chauhan Tested-by: Huang Rui Link: https://patchwork.freedesktop.org/patch/397080/?series=83051&rev=1

drm/ttm: give resource functions their own [ch] files

2020-08-12T13:51:03+00:00

This is a separate object we work within TTM. Signed-off-by: Christian König Reviewed-by: Dave Airlie Link: https://patchwork.freedesktop.org/patch/384338/?series=80346&rev=1

drm/ttm: rename bo manager to range manager.

2020-08-06T03:12:40+00:00

The generic manager is called the range manager now, rename the file and some internals. Reviewed-by: Christian König Reviewed-by: Ben Skeggs Signed-off-by: Dave Airlie Link: https://patchwork.freedesktop.org/patch/msgid/20200804025632.3868079-58-airlied@gmail.com

drm/ttm, drm/vmwgfx: Use a configuration option for the TTM dma page pool

2019-11-14T07:41:23+00:00

Drivers like vmwgfx may want to test whether the dma page pool is present or not. Since it's activated by default by TTM if compiled-in, define a hidden configuration option that the driver can test for. Cc: Christian König Signed-off-by: Thomas Hellstrom Reviewed-by: Christian König