This series: 1. Adds common drm-shmem memory shrinker 2. Enables shrinker for VirtIO-GPU driver 3. Switches Panfrost driver to the common shrinker 4. Fixes bugs and improves drm-shmem code Mesa: https://gitlab.freedesktop.org/digetx/mesa/-/commits/virgl-madvise IGT: https://gitlab.freedesktop.org/digetx/igt-gpu-tools/-/commits/virtio-madvise https://gitlab.freedesktop.org/digetx/igt-gpu-tools/-/commits/panfrost-madvise Changelog: v17:- Dropped patches that added new drm-shmem sgt flags, fixing dma-buf UAF in drm-prime error code path and preventing invalid page_count when GEM is freed. Will revist them later on and then factor them out into a seprate patchset. - Dropped patches that replaced drm_gem_shmem_free() with drm_gem_object_put(), they not needed anymore after changing drm_gem_shmem_free() to not touch reservation lock. - Addressed review comments from Boris Brezillon: - Added new patch to clean up error unwinding in drm_gem_shmem_vmap_locked() - Added new __drm_gem_shmem_put_pages() to let the callers to assert the held reservation lock themselves - Moved replacement of shmem->pages check with refcount_read() in drm_gem_shmem_free() to the shrinker addition patch - Improved commit message of the vmap_use_count patch - Added r-bs from Boris Brezillon that he gave to v16 v16:- Added more comments to the code for the new drm-shmem flags - Added r-bs from Boris Brezillon - Fixed typos and made impovements pointed out by Boris Brezillon - Replaced kref with refcount_t as was suggested by Boris Brezillon - Corrected placement of got_sgt flag in the Lima driver, also renamed flag to got_pages_sgt - Removed drm_gem_shmem_resv_assert_held() and made drm_gem_shmem_free() to free pages without a new func that doesn't touch resv lock, as was suggested by Boris Brezillon - Added pages_pin_count to drm_gem_shmem_print_info() v15:- Moved drm-shmem reference counters to use kref that allows to optimize unlocked functions, like was suggested by Boris Brezillon. - Changed drm/gem/shmem function names to use _locked postfix and dropped the _unlocked, making the naming scheme consistent across DRM code, like was suggested by Boris Brezillon. - Added patch that fixes UAF in drm-shmem for drivers that import dma-buf and then release buffer in the import error code path. - Added patch that makes drm-shmem use new flag for SGT's get_pages() refcounting, preventing unbalanced refcounting when GEM is freed. - Fixed guest blob pinning in virtio-gpu driver that was missed previously in the shrinker patch. - Moved VC4 and virtio-gpu drivers to use drm_gem_put() in GEM-creation error code paths, which is now required by drm-shmem and was missed in a previous patch versions. - Virtio-GPU now attaches shmem pages to host on first use and not when BO is created. In older patch versions there was a potential race condition in the BO creation code path where both get_sgt()+object_attach() should've been made under same resv lock, otherwise pages could be evicted before attachment is invoked. - Virtio-GPU and drm-shmem shrinker patches are split into smaller ones. v14:- All the prerequisite reservation locking patches landed upstream, previously were a part of this series in v13 and older. https://lore.kernel.org/dri-devel/20230529223935.2672495-1-dmitry.osipenko@xxxxxxxxxxxxx/ - Added patches to improve locked/unlocked function names, like was suggested by Boris Brezillon for v13. - Made all exported drm-shmem symbols GPL, like was previously discussed with Thomas Zimmermann on this series. - Improved virtio-gpu shrinker patch. Now it won't detach purged BO when userspace closes GEM. Crosvm (and not qemu) checks res_id on CMD_CTX_DETACH_RESOURCE and prints noisy error message if ID is invalid, which wasn't noticed before. v13:- Updated virtio-gpu shrinker patch to use drm_gem_shmem_object_pin() directly instead of drm_gem_pin() and dropped patch that exported drm_gem_pin() functions, like was requested by Thomas Zimmermann in v12. v12:- Fixed the "no previous prototype for function" warning reported by kernel build bot for v11. - Fixed the missing reservation lock reported by Intel CI for VGEM driver. Other drivers using drm-shmem were affected similarly to VGEM. The problem was in the dma-buf attachment code path that led to drm-shmem pinning function which assumed the held reservation lock by drm_gem_pin(). In the past that code path was causing trouble for i915 driver and we've changed the locking scheme for the attachment code path in the dma-buf core to let exporters to handle the locking themselves. After a closer investigation, I realized that my assumption about testing of dma-buf export code path using Panfrost driver was incorrect. Now I created additional local test to exrecise the Panfrost export path. I also reproduced the issue reported by the Intel CI for v10. It's all fixed now by making the drm_gem_shmem_pin() to take the resv lock by itself. - Patches are based on top of drm-tip, CC'd intel-gfx CI for testing. v11:- Rebased on a recent linux-next. Added new patch as a result: drm/shmem-helper: Export drm_gem_shmem_get_pages_sgt_locked() It's needed by the virtio-gpu driver to swap-in/unevict shmem object, previously get_pages_sgt() didn't use locking. - Separated the "Add memory shrinker" patch into smaller parts to ease the reviewing, as was requested by Thomas Zimmermann: drm/shmem-helper: Factor out pages alloc/release from drm_gem_shmem_get/put_pages() drm/shmem-helper: Add pages_pin_count field drm/shmem-helper: Switch drm_gem_shmem_vmap/vunmap to use pin/unpin drm/shmem-helper: Factor out unpinning part from drm_gem_shmem_purge() - Addessed the v10 review comments from Thomas Zimmermann: return errno instead of bool, sort code alphabetically, rename function and etc minor changes. - Added new patch to remove the "map->is_iomem" from drm-shmem, as was suggested by Thomas Zimmermann. - Added acks and r-b's that were given to v10. v10:- Was partially applied to misc-fixes/next. https://lore.kernel.org/dri-devel/6c16f303-81df-7ebe-85e9-51bb40a8b301@xxxxxxxxxxxxx/T/ Dmitry Osipenko (18): drm/gem: Change locked/unlocked postfix of drm_gem_v/unmap() function names drm/gem: Add _locked postfix to functions that have unlocked counterpart drm/shmem-helper: Make all exported symbols GPL drm/shmem-helper: Refactor locked/unlocked functions drm/shmem-helper: Remove obsoleted is_iomem test drm/shmem-helper: Add and use pages_pin_count drm/shmem-helper: Use refcount_t for pages_use_count drm/shmem-helper: Add and use lockless drm_gem_shmem_get_pages() drm/shmem-helper: Switch drm_gem_shmem_vmap/vunmap to use pin/unpin drm/shmem-helper: Use refcount_t for vmap_use_count drm/shmem-helper: Improve drm_gem_shmem_vmap_locked() error handling drm/shmem-helper: Prepare drm_gem_shmem_free() to shrinker addition drm/shmem-helper: Add memory shrinker drm/shmem-helper: Export drm_gem_shmem_get_pages_sgt_locked() drm/virtio: Pin display framebuffer BO drm/virtio: Attach shmem BOs dynamically drm/virtio: Support memory shrinking drm/panfrost: Switch to generic memory shrinker drivers/gpu/drm/drm_client.c | 6 +- drivers/gpu/drm/drm_gem.c | 26 +- drivers/gpu/drm/drm_gem_framebuffer_helper.c | 6 +- drivers/gpu/drm/drm_gem_shmem_helper.c | 588 +++++++++++++++--- drivers/gpu/drm/drm_internal.h | 4 +- drivers/gpu/drm/drm_prime.c | 4 +- drivers/gpu/drm/lima/lima_gem.c | 10 +- drivers/gpu/drm/lima/lima_sched.c | 4 +- drivers/gpu/drm/panfrost/Makefile | 1 - drivers/gpu/drm/panfrost/panfrost_device.h | 4 - drivers/gpu/drm/panfrost/panfrost_drv.c | 29 +- drivers/gpu/drm/panfrost/panfrost_dump.c | 4 +- drivers/gpu/drm/panfrost/panfrost_gem.c | 36 +- drivers/gpu/drm/panfrost/panfrost_gem.h | 9 - .../gpu/drm/panfrost/panfrost_gem_shrinker.c | 122 ---- drivers/gpu/drm/panfrost/panfrost_job.c | 18 +- drivers/gpu/drm/panfrost/panfrost_mmu.c | 4 +- drivers/gpu/drm/panfrost/panfrost_perfcnt.c | 6 +- drivers/gpu/drm/v3d/v3d_bo.c | 4 +- drivers/gpu/drm/virtio/virtgpu_drv.h | 22 +- drivers/gpu/drm/virtio/virtgpu_gem.c | 80 +++ drivers/gpu/drm/virtio/virtgpu_ioctl.c | 57 +- drivers/gpu/drm/virtio/virtgpu_kms.c | 8 + drivers/gpu/drm/virtio/virtgpu_object.c | 145 ++++- drivers/gpu/drm/virtio/virtgpu_plane.c | 17 +- drivers/gpu/drm/virtio/virtgpu_submit.c | 15 +- drivers/gpu/drm/virtio/virtgpu_vq.c | 40 ++ include/drm/drm_device.h | 10 +- include/drm/drm_gem.h | 6 +- include/drm/drm_gem_shmem_helper.h | 127 +++- include/uapi/drm/virtgpu_drm.h | 14 + 31 files changed, 1050 insertions(+), 376 deletions(-) delete mode 100644 drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c -- 2.41.0
