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Wed, 04 Feb 2026 11:43:46 +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 v2 0/4] drm/gem-shmem: Track page accessed/dirty status Date: Wed, 4 Feb 2026 12:39:28 +0100 Message-ID: <20260204114341.195143-1-tzimmermann@suse.de> X-Mailer: git-send-email 2.52.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Action: no action X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 9844540005 X-Stat-Signature: n4esoc56gmfy6kk16w6i9bgc9joiegwf X-Rspam-User: X-HE-Tag: 1770205428-624525 X-HE-Meta: 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 Z6ovcqp7 X5e/QuUkPOjgE5L1JG4c/dfTfUiPRCYjvHUcxY1dldiSGpo9FikMsoiDfd4TCn7MUZBWkSilpxA0y593RqkbtNaNzGLBnPwYn3rUHncoR+aPr9n4l/7A+3Jlt0fuxdI+OL/6HMzq/7HwUIKDfpX8caIHcMxteif/B9nZflWWubCVKEEbqgQX5+UBhQMfjHMhl6Sf5Zx82rn5FqP2eCEoIvkiTd+CUE1ZPJu7zBAQa5OL6eEVtIbBv0XKwPNSAJQZ3v4ZJYtTrb0r5umg= 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 and 2 switch from PFN-based mapping to page mapping. The pages are already available; only the mmap handling needs to be adapted. Patch 3 adds tracking access and dirty status in mmap. Patch 4 adds tracking access and dirty status in vmap. Becasue 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. v2: - fix possible OOB access into page array (Matthew) - simplify fault-handler error handling (Boris) - simplify internal interfaces (Matthew) Thomas Zimmermann (4): drm/gem-shmem: Return vm_fault_t from drm_gem_shmem_try_map_pmd() drm/gem-shmem: Map pages in mmap fault handler 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, 57 insertions(+), 26 deletions(-) base-commit: 6e53f6296065672f8a0c7f98b4b6c409dac382b4 -- 2.52.0