Thomas Zimmermann 3603996432 drm/fbdev-dma: Add shadow buffering for deferred I/O ... DMA areas are not necessarily backed by struct page, so we cannot rely on it for deferred I/O. Allocate a shadow buffer for drivers that require deferred I/O and use it as framebuffer memory. Fixes driver errors about being "Unable to handle kernel NULL pointer dereference at virtual address" or "Unable to handle kernel paging request at virtual address". The patch splits drm_fbdev_dma_driver_fbdev_probe() in an initial allocation, which creates the DMA-backed buffer object, and a tail that sets up the fbdev data structures. There is a tail function for direct memory mappings and a tail function for deferred I/O with the shadow buffer. It is no longer possible to use deferred I/O without shadow buffer. It can be re-added if there exists a reliably test for usable struct page in the allocated DMA-backed buffer object. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reported-by: Nuno Gonçalves <nunojpg@gmail.com> CLoses: https://lore.kernel.org/dri-devel/CAEXMXLR55DziAMbv_+2hmLeH-jP96pmit6nhs6siB22cpQFr9w@mail.gmail.com/ Tested-by: Nuno Gonçalves <nunojpg@gmail.com> Fixes: 5ab91447aa ("drm/tiny/ili9225: Use fbdev-dma") Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: <stable@vger.kernel.org> # v6.11+ Reviewed-by: Simona Vetter <simona.vetter@ffwll.ch> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20241211090643.74250-1-tzimmermann@suse.de		2025-02-27 09:37:55 +01:00
..
amd	Linux 6.13	2025-01-23 14:42:21 +01:00
arm	Merge remote-tracking branch 'drm-misc/drm-misc-next-fixes' into drm-misc-fixes	2025-02-06 09:59:35 +01:00
armada	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
aspeed	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
ast	Merge remote-tracking branch 'drm-misc/drm-misc-next-fixes' into drm-misc-fixes	2025-02-06 09:59:35 +01:00
atmel-hlcdc	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
bridge	Linux 6.13	2025-01-23 14:42:21 +01:00
ci	drm/ci: remove update-xfails.py	2024-11-05 10:50:55 -03:00
clients	drm/log: select CONFIG_FONT_SUPPORT	2024-12-12 18:26:32 +01:00
display	drm: Fix DSC BPP increment decoding	2025-02-13 10:20:30 +02:00
etnaviv	- cleanups	2025-01-10 10:55:06 +10:00
exynos	ASoC: hdmi-codec: move no_capture_mute to struct hdmi_codec_pdata	2025-01-04 08:47:10 +02:00
fsl-dcu	drm/fsl-dcu: Include <linux/of.h>	2024-12-13 15:20:40 +01:00
gma500	drm: remove driver date from struct drm_driver and all drivers	2024-12-05 12:35:42 +02:00
gud	drm: remove driver date from struct drm_driver and all drivers	2024-12-05 12:35:42 +02:00
hisilicon	drm/hisilicon/hibmc: select CONFIG_DRM_DISPLAY_DP_HELPER	2025-02-09 03:56:34 +02:00
hyperv	drm: remove driver date from struct drm_driver and all drivers	2024-12-05 12:35:42 +02:00
i2c	ASoC: hdmi-codec: move no_capture_mute to struct hdmi_codec_pdata	2025-01-04 08:47:10 +02:00
i915	Linux 6.13	2025-01-23 14:42:21 +01:00
imagination	drm/imagination: remove unnecessary header include path	2025-02-26 09:54:57 +00:00
imx	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
ingenic	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
kmb	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
lib	drm/lib: Include <linux/prandom.h> instead of <linux/random.h>	2024-10-03 18:19:38 +02:00
lima	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
logicvc	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
loongson	drm: remove driver date from struct drm_driver and all drivers	2024-12-05 12:35:42 +02:00
mcde	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
mediatek	Linux 6.13	2025-01-23 14:42:21 +01:00
meson	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
mgag200	drm: remove driver date from struct drm_driver and all drivers	2024-12-05 12:35:42 +02:00
msm	Merge tag 'drm-msm-next-2025-01-07' of gitlab.freedesktop.org:drm/msm into drm-next	2025-01-13 11:14:07 +10:00
mxsfb	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
nouveau	drm/nouveau: Do not override forced connector status	2025-02-26 14:18:15 -05:00
omapdrm	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
panel	drm: panel: jd9365da-h3: fix reset signal polarity	2025-02-13 17:46:51 +01:00
panfrost	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
panthor	drm/panthor: avoid garbage value in panthor_ioctl_dev_query()	2025-02-07 17:31:59 +01:00
pl111	drm: remove driver date from struct drm_driver and all drivers	2024-12-05 12:35:42 +02:00
qxl	drm: remove driver date from struct drm_driver and all drivers	2024-12-05 12:35:42 +02:00
radeon	drm/radeon: use eld_mutex to protect access to connector->eld	2024-12-16 18:02:08 +02:00
renesas	drm/rcar-du: Add support for r8a779h0	2024-12-17 15:13:04 +02:00
rockchip	drm/rockchip: vop2: Support 32x8 superblock afbc	2025-01-05 17:00:06 +01:00
scheduler	drm/sched: Fix drm_sched_fini() docu generation	2024-12-19 16:03:56 +01:00
solomon	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
sprd	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
sti	ASoC: hdmi-codec: move no_capture_mute to struct hdmi_codec_pdata	2025-01-04 08:47:10 +02:00
stm	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
sun4i	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
tegra	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
tests	drm/tests: hdmi: Fix recursive locking	2025-02-06 14:07:56 +01:00
tidss	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
tilcdc	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
tiny	Merge remote-tracking branch 'drm-misc/drm-misc-next-fixes' into drm-misc-fixes	2025-02-06 09:59:35 +01:00
ttm	DMEM cgroup pull request	2025-01-11 07:20:29 +10:00
tve200	drm-misc-next for 6.14:	2024-12-13 08:48:09 +10:00
udl	drm: remove driver date from struct drm_driver and all drivers	2024-12-05 12:35:42 +02:00
v3d	drm/v3d: Assign job pointer to NULL before signaling the fence	2025-01-23 16:15:01 -03:00
vboxvideo	drm: remove driver date from struct drm_driver and all drivers	2024-12-05 12:35:42 +02:00
vc4	drm/vc4: hdmi: use drm_atomic_helper_connector_hdmi_hotplug()	2025-01-04 08:47:11 +02:00
vgem	drm: remove driver date from struct drm_driver and all drivers	2024-12-05 12:35:42 +02:00
virtio	drm/virtio: Fix UAF in virtgpu_dma_buf_free_obj()	2025-01-19 15:12:28 +03:00
vkms	drm/vkms: Round fixp2int conversion in lerp_u16	2025-02-25 16:15:55 +01:00
vmwgfx	Linux 6.13	2025-01-23 14:42:21 +01:00
xe	Linux 6.13	2025-01-23 14:42:21 +01:00
xen	drm: remove driver date from struct drm_driver and all drivers	2024-12-05 12:35:42 +02:00
xlnx	Merge remote-tracking branch 'drm-misc/drm-misc-next-fixes' into drm-misc-fixes	2025-02-06 09:59:35 +01:00
drm_atomic_helper.c	drm/panic: Fix uninitialized spinlock acquisition with CONFIG_DRM_PANIC=n	2024-09-16 19:03:29 -04:00
drm_atomic_state_helper.c
drm_atomic_uapi.c	drm: Consistently use struct drm_mode_rect for FB_DAMAGE_CLIPS	2024-09-25 12:35:05 +02:00
drm_atomic.c	drm/atomic: add interlaced and ycbcr_420 flags to connector's state dump	2024-10-24 22:42:25 +03:00
drm_auth.c
drm_blend.c
drm_bridge.c	drm/bridge: Prioritize supported_formats over ycbcr_420_allowed	2025-01-13 11:18:20 +02:00
drm_buddy.c	drm/buddy: Add start address support to trim function	2024-08-07 18:19:00 -04:00
drm_cache.c
drm_client_event.c	drm/client: Make client support optional	2024-10-18 09:23:03 +02:00
drm_client_modeset.c	drm/client: Handle tiled displays better	2025-01-21 11:41:05 +01:00
drm_client.c	drm/client: Move client event handlers to drm_client_event.c	2024-10-18 09:23:03 +02:00
drm_color_mgmt.c	minmax: add a few more MIN_T/MAX_T users	2024-07-28 13:41:14 -07:00
drm_connector.c	Linux 6.13	2025-01-23 14:42:21 +01:00
drm_crtc_helper_internal.h
drm_crtc_helper.c
drm_crtc_internal.h	drm/panic: Add a QR code panic screen	2024-08-23 16:55:35 +02:00
drm_crtc.c
drm_damage_helper.c
drm_debugfs_crc.c
drm_debugfs.c	drm/client: Make client support optional	2024-10-18 09:23:03 +02:00
drm_displayid_internal.h
drm_displayid.c	drm/edid: reduce DisplayID log spamming	2024-08-14 10:19:09 +03:00
drm_draw_internal.h	drm/panic: Move drawing functions to drm_draw	2024-12-10 14:36:41 +01:00
drm_draw.c	drm/panic: Move drawing functions to drm_draw	2024-12-10 14:36:41 +01:00
drm_drv.c	drm/drv: Add drmm managed registration helper for dmem cgroups.	2025-01-06 17:25:35 +01:00
drm_dumb_buffers.c
drm_edid_load.c
drm_edid.c	drm/connector: add mutex to protect ELD from concurrent access	2024-12-16 18:02:07 +02:00
drm_eld.c
drm_encoder_slave.c
drm_encoder.c
drm_exec.c	mm: kvmalloc: align kvrealloc() with krealloc()	2024-09-01 20:25:44 -07:00
drm_fb_dma_helper.c
drm_fb_helper.c	drm/modeset: Handle tiled displays in pan_display_atomic.	2025-01-21 11:39:34 +01:00
drm_fbdev_dma.c	drm/fbdev-dma: Add shadow buffering for deferred I/O	2025-02-27 09:37:55 +01:00
drm_fbdev_shmem.c	drm/fbdev-shmem: Remove obsolete setup function	2024-09-26 09:31:28 +02:00
drm_fbdev_ttm.c	drm/fbdev-ttm: Remove obsolete setup function	2024-09-26 09:31:29 +02:00
drm_file.c	drm: make drm-active- stats optional	2024-12-19 16:56:17 +01:00
drm_flip_work.c
drm_format_helper.c
drm_fourcc.c	drm/fbdev-helper: Move color-mode lookup into 4CC format helper	2024-09-26 08:27:49 +02:00
drm_framebuffer.c	- The series "resource: A couple of cleanups" from Andy Shevchenko	2024-11-25 16:09:48 -08:00
drm_gem_atomic_helper.c
drm_gem_dma_helper.c	module: Convert symbol namespace to string literal	2024-12-02 11:34:44 -08:00
drm_gem_framebuffer_helper.c	module: Convert symbol namespace to string literal	2024-12-02 11:34:44 -08:00
drm_gem_shmem_helper.c	module: Convert symbol namespace to string literal	2024-12-02 11:34:44 -08:00
drm_gem_ttm_helper.c
drm_gem_vram_helper.c	drm/gem-vram: Remove support for simple display pipelines	2024-09-06 14:41:38 +02:00
drm_gem.c	drm/gem: Create a drm_gem_object_init_with_mnt() function	2024-09-25 08:40:20 -03:00
drm_gpuvm.c
drm_internal.h	drm/client: Make client support optional	2024-10-18 09:23:03 +02:00
drm_ioc32.c
drm_ioctl.c	drm: add DRM_SET_CLIENT_NAME ioctl	2024-10-08 10:00:30 +02:00
drm_kms_helper_common.c
drm_lease.c
drm_managed.c
drm_mipi_dbi.c
drm_mipi_dsi.c	drm/mipi-dsi: fix kernel doc on mipi_dsi_compression_mode_multi	2024-10-10 14:22:43 +02:00
drm_mm.c	drm/mm: annotate drm_mm_node_scanned_block() with __maybe_unused	2024-09-04 12:15:46 +03:00
drm_mode_config.c	drm/connector: Add FIXME for GETRESOURCES ioctl wrt. uninited connectors	2024-12-17 15:43:04 +02:00
drm_mode_object.c	drm/tests: Add test for drm_framebuffer_free()	2024-09-11 14:17:11 +02:00
drm_modes.c	Linux 6.13-rc6	2025-01-10 14:24:17 +10:00
drm_modeset_helper.c	drm/client: Move suspend/resume into DRM client callbacks	2024-10-18 09:23:03 +02:00
drm_modeset_lock.c
drm_of.c	gpu: drm: replace of_graph_get_next_endpoint()	2024-11-12 13:05:35 +01:00
drm_panel_backlight_quirks.c	drm: panel-backlight-quirks: Add Framework 13 glossy and 2.8k panels	2024-11-21 09:28:15 -06:00
drm_panel_orientation_quirks.c	drm for 6.13-rc1	2024-11-21 14:56:17 -08:00
drm_panel.c	drm: Use of_property_present() for non-boolean properties	2025-01-03 11:17:09 -06:00
drm_panic_qr.rs	drm/panic: remove spurious empty line to clean warning	2024-12-10 00:32:38 +01:00
drm_panic.c	drm/panic: Move drawing functions to drm_draw	2024-12-10 14:36:41 +01:00
drm_pci.c
drm_plane_helper.c
drm_plane.c
drm_prime.c	module: Convert symbol namespace to string literal	2024-12-02 11:34:44 -08:00
drm_print.c	drm/print: add drm_print_hex_dump()	2024-12-10 14:08:40 +02:00
drm_privacy_screen_x86.c
drm_privacy_screen.c
drm_probe_helper.c	drm/client: Move client event handlers to drm_client_event.c	2024-10-18 09:23:03 +02:00
drm_property.c
drm_rect.c	drm: Fix kerneldoc for "Returns" section	2024-08-26 16:40:09 +02:00
drm_self_refresh_helper.c
drm_simple_kms_helper.c
drm_suballoc.c
drm_syncobj.c	fdget(), trivial conversions	2024-11-03 01:28:06 -05:00
drm_sysfs.c
drm_trace_points.c
drm_trace.h
drm_vblank_work.c
drm_vblank.c	drm: Fix kerneldoc for "Returns" section	2024-08-26 16:40:09 +02:00
drm_vma_manager.c
drm_writeback.c	drm/writeback: remove pointless enable_signaling implementation	2024-10-09 14:23:37 +02:00
Kconfig	Merge remote-tracking branch 'drm-misc/drm-misc-next-fixes' into drm-misc-fixes	2025-02-06 09:59:35 +01:00
Makefile	drm/panic: Move drawing functions to drm_draw	2024-12-10 14:36:41 +01:00