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Wed, 25 Feb 2026 11:34:33 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 1kuxEUnenml+HwAAD6G6ig (envelope-from ); Wed, 25 Feb 2026 11:34:33 +0000 Message-ID: <04bc032c-3b6c-424c-b928-302a602d08bf@suse.de> Date: Wed, 25 Feb 2026 12:34:32 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 6/6] drm/gem-shmem: Track folio accessed/dirty status in vmap To: Frank Binns , Matt Coster , "simona@ffwll.ch" , "airlied@gmail.com" , "boris.brezillon@collabora.com" , "loic.molinari@collabora.com" , "willy@infradead.org" , "mripard@kernel.org" , "maarten.lankhorst@linux.intel.com" Cc: "dri-devel@lists.freedesktop.org" , "linux-mm@kvack.org" References: <20260209133241.238813-1-tzimmermann@suse.de> <20260209133241.238813-7-tzimmermann@suse.de> Content-Language: en-US From: Thomas Zimmermann Autocrypt: addr=tzimmermann@suse.de; keydata= xsBNBFs50uABCADEHPidWt974CaxBVbrIBwqcq/WURinJ3+2WlIrKWspiP83vfZKaXhFYsdg XH47fDVbPPj+d6tQrw5lPQCyqjwrCPYnq3WlIBnGPJ4/jreTL6V+qfKRDlGLWFjZcsrPJGE0 BeB5BbqP5erN1qylK9i3gPoQjXGhpBpQYwRrEyQyjuvk+Ev0K1Jc5tVDeJAuau3TGNgah4Yc hdHm3bkPjz9EErV85RwvImQ1dptvx6s7xzwXTgGAsaYZsL8WCwDaTuqFa1d1jjlaxg6+tZsB 9GluwvIhSezPgnEmimZDkGnZRRSFiGP8yjqTjjWuf0bSj5rUnTGiyLyRZRNGcXmu6hjlABEB AAHNJ1Rob21hcyBaaW1tZXJtYW5uIDx0emltbWVybWFubkBzdXNlLmRlPsLAjgQTAQgAOAIb AwULCQgHAgYVCgkICwIEFgIDAQIeAQIXgBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftODH AAoJEGgNwR1TC3ojx1wH/0hKGWugiqDgLNXLRD/4TfHBEKmxIrmfu9Z5t7vwUKfwhFL6hqvo lXPJJKQpQ2z8+X2vZm/slsLn7J1yjrOsoJhKABDi+3QWWSGkaGwRJAdPVVyJMfJRNNNIKwVb U6B1BkX2XDKDGffF4TxlOpSQzdtNI/9gleOoUA8+jy8knnDYzjBNOZqLG2FuTdicBXblz0Mf vg41gd9kCwYXDnD91rJU8tzylXv03E75NCaTxTM+FBXPmsAVYQ4GYhhgFt8S2UWMoaaABLDe 7l5FdnLdDEcbmd8uLU2CaG4W2cLrUaI4jz2XbkcPQkqTQ3EB67hYkjiEE6Zy3ggOitiQGcqp j//OwE0EWznS4AEIAMYmP4M/V+T5RY5at/g7rUdNsLhWv1APYrh9RQefODYHrNRHUE9eosYb T6XMryR9hT8XlGOYRwKWwiQBoWSDiTMo/Xi29jUnn4BXfI2px2DTXwc22LKtLAgTRjP+qbU6 3Y0xnQN29UGDbYgyyK51DW3H0If2a3JNsheAAK+Xc9baj0LGIc8T9uiEWHBnCH+RdhgATnWW GKdDegUR5BkDfDg5O/FISymJBHx2Dyoklv5g4BzkgqTqwmaYzsl8UxZKvbaxq0zbehDda8lv hFXodNFMAgTLJlLuDYOGLK2AwbrS3Sp0AEbkpdJBb44qVlGm5bApZouHeJ/+n+7r12+lqdsA EQEAAcLAdgQYAQgAIAIbDBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftOH6AAoJEGgNwR1T C3ojVSkIALpAPkIJPQoURPb1VWjh34l0HlglmYHvZszJWTXYwavHR8+k6Baa6H7ufXNQtThR yIxJrQLW6rV5lm7TjhffEhxVCn37+cg0zZ3j7zIsSS0rx/aMwi6VhFJA5hfn3T0TtrijKP4A SAQO9xD1Zk9/61JWk8OysuIh7MXkl0fxbRKWE93XeQBhIJHQfnc+YBLprdnxR446Sh8Wn/2D Ya8cavuWf2zrB6cZurs048xe0UbSW5AOSo4V9M0jzYI4nZqTmPxYyXbm30Kvmz0rYVRaitYJ 4kyYYMhuULvrJDMjZRvaNe52tkKAvMevcGdt38H4KSVXAylqyQOW5zvPc4/sq9c= In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Stat-Signature: dz1e4disq9f8mw769giwetd6cp4oh8gt X-Rspamd-Server: rspam11 X-Rspam-User: X-Rspamd-Queue-Id: 64930160004 X-HE-Tag: 1772019276-424226 X-HE-Meta: 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 430dKwkD 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Am 25.02.26 um 11:57 schrieb Frank Binns: > Hi Thomas, > > On Mon, 2026-02-09 at 14:27 +0100, Thomas Zimmermann wrote: >> On successful vmap, set the page_mark_accessed_on_put and _dirty_on_put >> flags in the gem-shmem object. Signals that the contained pages require >> LRU and dirty tracking when they are being released back to SHMEM. Clear >> these flags on put, so that the buffer remains quiet until the next call >> to vmap. There's no means of handling dirty status in vmap as there's no >> write-only mapping available. >> >> Both flags, _accessed_on_put and _dirty_on_put, have always been part of >> the gem-shmem object, but never used much. So most drivers did not track >> the page status correctly. >> >> Only the v3d and imagination drivers make limited use of _dirty_on_put. In >> the case of imagination, move the flag setting from init to cleanup. This >> ensures writeback of modified pages but does not interfere with the >> internal vmap/vunmap calls. V3d already implements this behaviour. >> >> Signed-off-by: Thomas Zimmermann >> Reviewed-by: Boris Brezillon # gem-shmem > The change to the imagination driver is: > > Acked-by: Frank Binns > Tested-by: Frank Binns Great, thanks a lot. > > Thanks > Frank > >> --- >> drivers/gpu/drm/drm_gem_shmem_helper.c | 4 ++++ >> drivers/gpu/drm/imagination/pvr_gem.c | 6 ++++-- >> 2 files changed, 8 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c >> index 0c86ad40a049..dda9af9bf5b3 100644 >> --- a/drivers/gpu/drm/drm_gem_shmem_helper.c >> +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c >> @@ -265,6 +265,8 @@ void drm_gem_shmem_put_pages_locked(struct drm_gem_shmem_object *shmem) >> shmem->pages_mark_dirty_on_put, >> shmem->pages_mark_accessed_on_put); >> shmem->pages = NULL; >> + shmem->pages_mark_accessed_on_put = false; >> + shmem->pages_mark_dirty_on_put = false; >> } >> } >> EXPORT_SYMBOL_GPL(drm_gem_shmem_put_pages_locked); >> @@ -397,6 +399,8 @@ int drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem, >> } else { >> iosys_map_set_vaddr(map, shmem->vaddr); >> refcount_set(&shmem->vmap_use_count, 1); >> + shmem->pages_mark_accessed_on_put = true; >> + shmem->pages_mark_dirty_on_put = true; >> } >> } >> >> diff --git a/drivers/gpu/drm/imagination/pvr_gem.c b/drivers/gpu/drm/imagination/pvr_gem.c >> index c07c9a915190..307b02c916d4 100644 >> --- a/drivers/gpu/drm/imagination/pvr_gem.c >> +++ b/drivers/gpu/drm/imagination/pvr_gem.c >> @@ -25,7 +25,10 @@ >> >> static void pvr_gem_object_free(struct drm_gem_object *obj) >> { >> - drm_gem_shmem_object_free(obj); >> + struct drm_gem_shmem_object *shmem_obj = to_drm_gem_shmem_obj(obj); >> + >> + shmem_obj->pages_mark_dirty_on_put = true; >> + drm_gem_shmem_free(shmem_obj); >> } >> >> static struct dma_buf *pvr_gem_export(struct drm_gem_object *obj, int flags) >> @@ -363,7 +366,6 @@ pvr_gem_object_create(struct pvr_device *pvr_dev, size_t size, u64 flags) >> if (IS_ERR(shmem_obj)) >> return ERR_CAST(shmem_obj); >> >> - shmem_obj->pages_mark_dirty_on_put = true; >> shmem_obj->map_wc = !(flags & PVR_BO_CPU_CACHED); >> pvr_obj = shmem_gem_to_pvr_gem(shmem_obj); >> pvr_obj->flags = flags; -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)