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linux/include/drm/drm_suballoc.h

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drm/suballoc: Extract amdgpu_sa.c as generic suballocation helper Suballocating a buffer object is something that is not driver-specific and useful for many drivers. Use a slightly modified version of amdgpu_sa.c v2: - Style cleanups. - Added / Modified documentation. - Use u64 for the sizes and offset. The code dates back to 2012 and using unsigned int will probably soon come back to bite us. We can consider size_t as well for better 32-bit efficiency. - Add and document gfp, intr and align arguments to drm_suballoc_new(). - Use drm_printer for debug output. v3: - Remove stale author info (Christian König) v4: - Avoid 64-bit integer divisions (kernel test robot <lkp@intel.com>) - Use size_t rather than u64 for the managed range. (Thomas) Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Christian König <christian.koenig@amd.com> Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Acked-by: Alex Deucher <alexdeucher@gmail.com> Acked-by: Christian König <christian.koenig@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230224095152.30134-2-thomas.hellstrom@linux.intel.com
2023-02-24 10:51:50 +01:00
drm/suballoc: fix drm_suballoc.h kernel-doc Rename dma_fence to fence to match code. Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/36d18b315fd9a6788484667f644b3fea347fb007.1709749576.git.jani.nikula@intel.com
2024-03-06 20:31:19 +02:00
drm/suballoc: Extract amdgpu_sa.c as generic suballocation helper Suballocating a buffer object is something that is not driver-specific and useful for many drivers. Use a slightly modified version of amdgpu_sa.c v2: - Style cleanups. - Added / Modified documentation. - Use u64 for the sizes and offset. The code dates back to 2012 and using unsigned int will probably soon come back to bite us. We can consider size_t as well for better 32-bit efficiency. - Add and document gfp, intr and align arguments to drm_suballoc_new(). - Use drm_printer for debug output. v3: - Remove stale author info (Christian König) v4: - Avoid 64-bit integer divisions (kernel test robot <lkp@intel.com>) - Use size_t rather than u64 for the managed range. (Thomas) Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Christian König <christian.koenig@amd.com> Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Acked-by: Alex Deucher <alexdeucher@gmail.com> Acked-by: Christian König <christian.koenig@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230224095152.30134-2-thomas.hellstrom@linux.intel.com
2023-02-24 10:51:50 +01:00
drm/sa: Split drm_suballoc_new() into SA alloc and init helpers drm_suballoc_new() currently both allocates the SA object using kmalloc() and searches for a suitable hole in the sub-allocator for the requested size. If SA allocation is done by holding sub-allocator mutex, this design can lead to reclaim safety issues. By splitting the kmalloc() step outside of the critical section, we allow the memory allocation to use GFP_KERNEL (reclaim-safe) while ensuring that the initialization step that holds reclaim-tainted locks (sub-allocator mutex) operates in a reclaim-unsafe context with pre-allocated memory. This separation prevents potential deadlocks where memory reclaim could attempt to acquire locks that are already held during the sub-allocator operations. Signed-off-by: Satyanarayana K V P <satyanarayana.k.v.p@intel.com> Suggested-by: Matthew Brost <matthew.brost@intel.com> Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com> Cc: Michal Wajdeczko <michal.wajdeczko@intel.com> Cc: Matthew Auld <matthew.auld@intel.com> Cc: Christian König <christian.koenig@amd.com> Cc: dri-devel@lists.freedesktop.org Cc: Maarten Lankhorst <dev@lankhorst.se> Reviewed-by: Christian König <christian.koenig@amd.com> Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Matthew Brost <matthew.brost@intel.com> Acked-by: Maarten Lankhorst <dev@lankhorst.se> Signed-off-by: Matthew Brost <matthew.brost@intel.com> Link: https://patch.msgid.link/20260220055519.2485681-6-satyanarayana.k.v.p@intel.com
2026-02-20 05:55:21 +00:00
drm/suballoc: Extract amdgpu_sa.c as generic suballocation helper Suballocating a buffer object is something that is not driver-specific and useful for many drivers. Use a slightly modified version of amdgpu_sa.c v2: - Style cleanups. - Added / Modified documentation. - Use u64 for the sizes and offset. The code dates back to 2012 and using unsigned int will probably soon come back to bite us. We can consider size_t as well for better 32-bit efficiency. - Add and document gfp, intr and align arguments to drm_suballoc_new(). - Use drm_printer for debug output. v3: - Remove stale author info (Christian König) v4: - Avoid 64-bit integer divisions (kernel test robot <lkp@intel.com>) - Use size_t rather than u64 for the managed range. (Thomas) Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Christian König <christian.koenig@amd.com> Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Acked-by: Alex Deucher <alexdeucher@gmail.com> Acked-by: Christian König <christian.koenig@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230224095152.30134-2-thomas.hellstrom@linux.intel.com
2023-02-24 10:51:50 +01:00