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Fri, 15 May 2026 12:09:20 +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 1KOhAvAMB2rQFwAAD6G6ig (envelope-from ); Fri, 15 May 2026 12:09:20 +0000 From: Thomas Zimmermann To: simona@ffwll.ch, airlied@gmail.com, mdaenzer@redhat.com, pekka.paalanen@collabora.com, jadahl@gmail.com, contact@emersion.fr, maarten.lankhorst@linux.intel.com, mripard@kernel.org Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-hyperv@vger.kernel.org, virtualization@lists.linux.dev, spice-devel@lists.freedesktop.org, Thomas Zimmermann Subject: [PATCH 0/9] drm: Limit DRM_IOCTL_WAIT_VBLANK to vblank interrupts Date: Fri, 15 May 2026 13:55:05 +0200 Message-ID: <20260515120916.333614-1-tzimmermann@suse.de> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Flag: NO X-Spam-Score: -2.80 X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_TWELVE(0.00)[14]; MIME_TRACE(0.00)[0:+]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.de:mid]; FUZZY_RATELIMITED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FREEMAIL_TO(0.00)[ffwll.ch,gmail.com,redhat.com,collabora.com,emersion.fr,linux.intel.com,kernel.org]; RCVD_TLS_ALL(0.00)[]; TO_DN_SOME(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FREEMAIL_ENVRCPT(0.00)[gmail.com] X-Spam-Level: DRM's WAIT_VBLANK ioctl synchronizes user-space clients to display refresh. This is meaningless with vblank timers, which run unrelated to the hardware's vblank. Disable the ioctl for simulated vblanks. Set DRM_VBLANK_FLAG_SIMULATED for CRTCs with simulated vblank events in all such drivers. The vblank timers of these devices still rate-limit the number of page-flip events to match the display refresh. According to maintainers, user-space compositors do not require the ioctl for rate-limitting display output. Weston and Kwin rely on page-flip events. Mutter uses and internal timer to limit the number of display updates per second. When testing with mutter and weston, the page-flip rate appears correct with the patch set applied. This change has been discussed at length on IRC recently. https://people.freedesktop.org/~cbrill/dri-log/?channel=dri-devel&highlight_names=&date=2026-05-08&show_html=true https://people.freedesktop.org/~cbrill/dri-log/?channel=dri-devel&highlight_names=&date=2026-05-12&show_html=true https://people.freedesktop.org/~cbrill/dri-log/?channel=dri-devel&highlight_names=&date=2026-05-13&show_html=true Thomas Zimmermann (9): drm/vblank: Add drmm_vblank_init() to indicate managed cleanup drm/vblank: Add DRM_VBLANK_FLAG_SIMULATED drm/amdgpu: vkms: Set DRM_VBLANK_FLAG_SIMULATED drm/bochs: Set DRM_VBLANK_FLAG_SIMULATED drm/cirrus: Set DRM_VBLANK_FLAG_SIMULATED drm/hypervdrm: Set DRM_VBLANK_FLAG_SIMULATED drm/qxl: Set DRM_VBLANK_FLAG_SIMULATED drm/virtgpu: Set DRM_VBLANK_FLAG_SIMULATED drm/vkms: Set DRM_VBLANK_FLAG_SIMULATED drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c | 3 ++- drivers/gpu/drm/drm_vblank.c | 19 ++++++++++++------- drivers/gpu/drm/drm_vblank_helper.c | 2 +- drivers/gpu/drm/hyperv/hyperv_drm_modeset.c | 2 +- drivers/gpu/drm/qxl/qxl_display.c | 2 +- drivers/gpu/drm/tiny/bochs.c | 2 +- drivers/gpu/drm/tiny/cirrus-qemu.c | 2 +- drivers/gpu/drm/virtio/virtgpu_display.c | 2 +- drivers/gpu/drm/vkms/vkms_drv.c | 4 ++-- include/drm/drm_crtc.h | 2 +- include/drm/drm_device.h | 2 +- include/drm/drm_vblank.h | 15 ++++++++++++++- 12 files changed, 38 insertions(+), 19 deletions(-) base-commit: 121c16f9d8c56ea07263df84ab971cc10870fe88 -- 2.54.0