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Mon, 09 Feb 2026 13:32:45 +0000 From: Thomas Zimmermann To: boris.brezillon@collabora.com, loic.molinari@collabora.com, willy@infradead.org, frank.binns@imgtec.com, matt.coster@imgtec.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, airlied@gmail.com, simona@ffwll.ch Cc: dri-devel@lists.freedesktop.org, linux-mm@kvack.org, Thomas Zimmermann Subject: [PATCH v3 0/6] drm/gem-shmem: Track page accessed/dirty status Date: Mon, 9 Feb 2026 14:27:09 +0100 Message-ID: <20260209133241.238813-1-tzimmermann@suse.de> X-Mailer: git-send-email 2.52.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 5cuyffjmak4qx864k8wr13nqjfisitwc X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: CBBD840016 X-HE-Tag: 1770643967-60361 X-HE-Meta: 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 vPIrf9Em u8r1Wu38LFZ+J0UCGGbD4CKCAQ4/8QVdvoZ4io5c7aKLrBIp87Dbmtm4MrNVkIU0TZqIVxRrLvBIA5Kyc/nz2hyRQqTvSLZLr0WvAw/Mj/m1YkLwWCpRgd80TtYztE6d2/BfKSdsqYKy4rQZuBtBUYgUNQ7psChaoq0FQKP0iIyu6azbtR1KLrbGKi5NrVvkbJo+ktT7fj0/kx8hCsLtOn8zKfy7gQZGMtbVVRuInHnU2YDlObSjD3NvdKViLSybgBAlkZLviBcL8ZG8= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Track page access/dirty status in gem-shmem for better integration with the overall memory management. Gem-shmem has long had two flag bits in struct drm_gem_shmem_object, named pages_mark_accessed_on_put and pages_mark_dirty_on_put, but never used them much; except for some odd cases in drivers. Therefore pages in gem-shmem where never marked correctly. (Other DRM memory managers do some course-grain tracking at least). Patches 1 to 4 prepare the mmap page-fault handler for tracking page status easily. The pages are already available; only the mmap handling needs to be adapted. The way the shmem code interacts with huge-page support is also not optimal, hence refactor it slightly. Patch 5 adds tracking access and dirty status in mmap. With the earlier patches, this change simply falls into place. Patch 6 adds tracking access and dirty status in vmap. Because there's no fault handling here, we refer to the existing status bits in struct drm_gem_shmem_object. Each page's status will be updated by the page release in drm_gem_put_pages(). The imagination driver requires a small fix to make it work correctly. Tested with CONFIG_VM=y by running animations on DRM's bochs driver for several hours. This uses gem-shmem's mmap and vmap extensively. v3: - rewrite for VM_PFNMAP - do more preparational patches v2: - fix possible OOB access into page array (Matthew) - simplify fault-handler error handling (Boris) - simplify internal interfaces (Matthew) Thomas Zimmermann (6): drm/gem-shmem: Use obj directly where appropriate in fault handler drm/gem-shmem: Test for existence of page in mmap fault handler drm/gem-shmem: Return vm_fault_t from drm_gem_shmem_try_map_pmd() drm/gem-shmem: Refactor drm_gem_shmem_try_map_pmd() drm/gem-shmem: Track folio accessed/dirty status in mmap drm/gem-shmem: Track folio accessed/dirty status in vmap drivers/gpu/drm/drm_gem_shmem_helper.c | 77 ++++++++++++++++---------- drivers/gpu/drm/imagination/pvr_gem.c | 6 +- 2 files changed, 53 insertions(+), 30 deletions(-) base-commit: 0082025812a31eda451fb14f13f52683ed375c49 -- 2.52.0