Merge tag 'drm-misc-next-2020-10-27' of git://anongit.freedesktop.org/drm/drm-misc into drm-next

drm-misc-next for 5.11:

UAPI Changes:

  - doc: rules for EBUSY on non-blocking commits; requirements for fourcc
    modifiers; on parsing EDID
  - fbdev/sbuslib: Remove unused FBIOSCURSOR32
  - fourcc: deprecate DRM_FORMAT_MOD_NONE
  - virtio: Support blob resources for memory allocations; Expose host-visible
    and cross-device features

Cross-subsystem Changes:

  - devicetree: Add vendor Prefix for Yes Optoelectronics, Shanghai Top Display
    Optoelectronics
  - dma-buf: Add struct dma_buf_map that stores DMA pointer and I/O-memory flag;
    dma_buf_vmap()/vunmap() return address in dma_buf_map; Use struct_size() macro

Core Changes:

  - atomic: pass full state to CRTC atomic enable/disable; warn for EBUSY during
    non-blocking commits
  - dp: Prepare for DP 2.0 DPCD
  - dp_mst: Receive extended DPCD caps
  - dma-buf: Documentation
  - doc: Format modifiers; dma-buf-map; Cleanups
  - fbdev: Don't use compat_alloc_user_space(); mark as orphaned
  - fb-helper: Take lock in drm_fb_helper_restore_work_fb()
  - gem: Convert implementation and drivers to GEM object functions, remove
    GEM callbacks from struct drm_driver (expect gem_prime_mmap)
  - panel: Cleanups
  - pci: Add legacy infix to drm_irq_by_busid()
  - sched: Avoid infinite waits in drm_sched_entity_destroy()
  - switcheroo: Cleanups
  - ttm: Remove AGP support; Don't modify caching during swapout; Major
    refactoring of the implementation and API that affects all depending
    drivers; Add ttm_bo_wait_ctx(); Add ttm_bo_pin()/unpin() in favor of
    TTM_PL_FLAG_NO_EVICT; Remove ttm_bo_create(); Remove fault_reserve_notify()
    callback; Push move() implementation into drivers; Remove TTM_PAGE_FLAG_WRITE;
    Replace caching flags with init-time cache setting; Push ttm_tt_bind() into
    drivers; Replace move_notify() with delete_mem_notify(); No overlapping memcpy();
    no more ttm_set_populated()
  - vram-helper: Fix BO top-down placement; TTM-related changes; Init GEM
    object functions with defaults; Default placement in system memory; Cleanups

Driver Changes:

  - amdgpu: Use GEM object functions
  - armada: Use GEM object functions
  - aspeed: Configure output via sysfs; Init struct drm_driver with
  - ast: Reload LUT after FB format changes
  - bridge: Add driver and DT bindings for anx7625; Cleanups
  - bridge/dw-hdmi: Constify ops
  - bridge/ti-sn65dsi86: Add retries for link training
  - bridge/lvds-codec: Add support for regulator
  - bridge/tc358768: Restore connector support DRM_GEM_CMA_DRIVEROPS; Cleanups
  - display/ti,j721e-dss: Add DT properies assigned-clocks, assigned-clocks-parent and
    dma-coherent
  - display/ti,am65s-dss: Add DT properies assigned-clocks, assigned-clocks-parent and
    dma-coherent
  - etnaviv: Use GEM object functions
  - exynos: Use GEM object functions
  - fbdev: Cleanups and compiler fixes throughout framebuffer drivers
  - fbdev/cirrusfb: Avoid division by 0
  - gma500: Use GEM object functions; Fix double-free of connector; Cleanups
  - hisilicon/hibmc: I2C-based DDC support; Use to_hibmc_drm_device(); Cleanups
  - i915: Use GEM object functions
  - imx/dcss: Init driver with DRM_GEM_CMA_DRIVER_OPS; Cleanups
  - ingenic: Reset pixel clock when parent clock changes; support reserved
    memory; Alloc F0 and F1 DMA channels at once; Support different pixel formats;
    Revert support for cached mmap buffers
    on F0/F1; support 30-bit/24-bit/8-bit-palette modes
  - komeda: Use DEFINE_SHOW_ATTRIBUTE
  - mcde: Detect platform_get_irq() errors
  - mediatek: Use GEM object functions
  - msm: Use GEM object functions
  - nouveau: Cleanups; TTM-related changes; Use GEM object functions
  - omapdrm: Use GEM object functions
  - panel: Add driver and DT bindings for Novatak nt36672a; Add driver and DT
    bindings for YTC700TLAG-05-201C; Add driver and DT bindings for TDO TL070WSH30;
    Cleanups
  - panel/mantix: Fix reset; Fix deref of NULL pointer in mantix_get_modes()
  - panel/otm8009a: Allow non-continuous dsi clock; Cleanups
  - panel/rm68200: Allow non-continuous dsi clock; Fix mode to 50 FPS
  - panfrost: Fix job timeout handling; Cleanups
  - pl111: Use GEM object functions
  - qxl: Cleanups; TTM-related changes; Pin new BOs with ttm_bo_init_reserved()
  - radeon: Cleanups; TTM-related changes; Use GEM object functions
  - rockchip: Use GEM object functions
  - shmobile: Cleanups
  - tegra: Use GEM object functions
  - tidss: Set drm_plane_helper_funcs.prepare_fb
  - tilcdc: Don't keep vblank interrupt enabled all the time
  - tve200: Detect platform_get_irq() errors
  - vc4: Use GEM object functions; Only register components once DSI is attached;
    Add Maxime as maintainer
  - vgem: Use GEM object functions
  - via: Simplify critical section in via_mem_alloc()
  - virtgpu: Use GEM object functions
  - virtio: Implement blob resources, host-visible and cross-device features;
    Support mapping of host-allocated resources; Use UUID APi; Cleanups
  - vkms: Use GEM object functions; Switch to SHMEM
  - vmwgfx: TTM-related changes; Inline ttm_bo_swapout_all()
  - xen: Use GEM object functions
  - xlnx: Use GEM object functions

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20201027100936.GA4858@linux-uq9g

1 files changed, 34 insertions, 5 deletions

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 58527f151984..b2d20eb6c807 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -281,6 +281,10 @@ EXPORT_SYMBOL(__drm_atomic_state_free);
  * needed. It will also grab the relevant CRTC lock to make sure that the state
  * is consistent.
  *
+ * WARNING: Drivers may only add new CRTC states to a @state if
+ * drm_atomic_state.allow_modeset is set, or if it's a driver-internal commit
+ * not created by userspace through an IOCTL call.
+ *
  * Returns:
  *
  * Either the allocated state or the error code encoded into the pointer. When
@@ -1262,10 +1266,15 @@ int drm_atomic_check_only(struct drm_atomic_state *state)
 	struct drm_crtc_state *new_crtc_state;
 	struct drm_connector *conn;
 	struct drm_connector_state *conn_state;
+	unsigned requested_crtc = 0;
+	unsigned affected_crtc = 0;
 	int i, ret = 0;
 
 	DRM_DEBUG_ATOMIC("checking %p\n", state);
 
+	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i)
+		requested_crtc |= drm_crtc_mask(crtc);
+
 	for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
 		ret = drm_atomic_plane_check(old_plane_state, new_plane_state);
 		if (ret) {
@@ -1313,6 +1322,26 @@ int drm_atomic_check_only(struct drm_atomic_state *state)
 		}
 	}
 
+	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i)
+		affected_crtc |= drm_crtc_mask(crtc);
+
+	/*
+	 * For commits that allow modesets drivers can add other CRTCs to the
+	 * atomic commit, e.g. when they need to reallocate global resources.
+	 * This can cause spurious EBUSY, which robs compositors of a very
+	 * effective sanity check for their drawing loop. Therefor only allow
+	 * drivers to add unrelated CRTC states for modeset commits.
+	 *
+	 * FIXME: Should add affected_crtc mask to the ATOMIC IOCTL as an output
+	 * so compositors know what's going on.
+	 */
+	if (affected_crtc != requested_crtc) {
+		DRM_DEBUG_ATOMIC("driver added CRTC to commit: requested 0x%x, affected 0x%0x\n",
+				 requested_crtc, affected_crtc);
+		WARN(!state->allow_modeset, "adding CRTC not allowed without modesets: requested 0x%x, affected 0x%0x\n",
+		     requested_crtc, affected_crtc);
+	}
+
 	return 0;
 }
 EXPORT_SYMBOL(drm_atomic_check_only);
@@ -1613,11 +1642,11 @@ static void __drm_state_dump(struct drm_device *dev, struct drm_printer *p,
  * to dmesg in case of error irq's.  (Hint, you probably want to
  * ratelimit this!)
  *
- * The caller must drm_modeset_lock_all(), or if this is called
- * from error irq handler, it should not be enabled by default.
- * (Ie. if you are debugging errors you might not care that this
- * is racey.  But calling this without all modeset locks held is
- * not inherently safe.)
+ * The caller must wrap this drm_modeset_lock_all_ctx() and
+ * drm_modeset_drop_locks(). If this is called from error irq handler, it should
+ * not be enabled by default - if you are debugging errors you might
+ * not care that this is racey, but calling this without all modeset locks held
+ * is inherently unsafe.
  */
 void drm_state_dump(struct drm_device *dev, struct drm_printer *p)
 {