Modesets require a buffer. The DRM backend tried to auto-enable
outputs when a CRTC becomes available in the past, but now that
fails because no buffer is available.
Instead of having this magic inside the DRM backend, a better
approach is to do it in the compositor or in an optional helper.
Previously, we were copying wlr_output_state on the stack and
patching it up to be guaranteed to have a proper drmModeModeInfo
stored in it (and not a custom mode). Also, we had a bunch of
helpers deriving DRM-specific information from the generic
wlr_output_state.
Copying the wlr_output_state worked fine so far, but with output
layers we'll be getting a wl_list in there. An empty wl_list stores
two pointers to itself, copying it on the stack blindly results in
infinite loops in wl_list_for_each.
To fix this, rework our DRM backend to stop copying wlr_output_state,
instead add a new struct wlr_drm_connector_state which holds both
the wlr_output_state and additional DRM-specific information.
Using GBM to import DRM dumb buffers tends to not work well. By
using GBM we're calling some driver-specific functions in Mesa.
These functions check whether Mesa can work with the buffer.
Sometimes Mesa has requirements which differ from DRM dumb buffers
and the GBM import will fail (e.g. on amdgpu).
Instead, drop GBM and use drmPrimeFDToHandle directly. But there's
a twist: BO handles are not ref'counted by the kernel and need to
be ref'counted in user-space [1]. libdrm usually performs this
bookkeeping and is used under-the-hood by Mesa.
We can't re-use libdrm for this task without using driver-specific
APIs. So let's just re-implement the ref'counting logic in wlroots.
The wlroots implementation is inspired from amdgpu's in libdrm [2].
Closes: https://github.com/swaywm/wlroots/issues/2916
[1]: https://gitlab.freedesktop.org/mesa/drm/-/merge_requests/110
[2]: 1a4c0ec9ae/amdgpu/handle_table.c
The Coordinated Video Timings (CVT) spec [1] defines two types of
timings: the "CVT standard CRT" timings and the "CVT reduced blanking"
timings (see section 3.6).
The standard CRT timings include pauses in the video stream to allow
CRT displays to reposition their electron beam at the end of each
horizontal scan line [2]. While this was desirable a few decades ago,
nowadays we can just generate a CVT reduced blanking timing by default.
wlroots users can still set full custom DRM modes via
wlr_drm_connector_add_mode.
[1]: https://glenwing.github.io/docs/VESA-CVT-1.2.pdf
[2]: https://en.wikipedia.org/wiki/Coordinated_Video_Timings#Reduced_blanking
To retrieve the formats, an allocated crtc is required. If there is no
currently no crtc available, try to allocate it. This reproducable by
having a disabled output and going through a suspend cycle with amdgpu.
On start CRTCs look like this:
00:00:00.588 [DEBUG] [wlr] [backend/drm/drm.c:1099] Reallocating CRTCs
00:00:00.588 [DEBUG] [wlr] [backend/drm/drm.c:1110] State before reallocation:
00:00:00.588 [DEBUG] [wlr] [backend/drm/drm.c:1116] 'DP-1' crtc=0 state=1 desired_enabled=1
00:00:00.588 [DEBUG] [wlr] [backend/drm/drm.c:1116] 'DP-2' crtc=1 state=1 desired_enabled=1
00:00:00.588 [DEBUG] [wlr] [backend/drm/drm.c:1116] 'HDMI-A-1' crtc=-1 state=0 desired_enabled=0
00:00:00.588 [DEBUG] [wlr] [backend/drm/drm.c:1116] 'HDMI-A-2' crtc=-1 state=0 desired_enabled=0
00:00:00.588 [DEBUG] [wlr] [backend/drm/drm.c:1116] 'DVI-D-1' crtc=-1 state=0 desired_enabled=0
00:00:00.588 [DEBUG] [wlr] [backend/drm/drm.c:1167] State after reallocation:
00:00:00.588 [DEBUG] [wlr] [backend/drm/drm.c:1174] 'DP-1' crtc=0 state=1 desired_enabled=1
00:00:00.588 [DEBUG] [wlr] [backend/drm/drm.c:1174] 'DP-2' crtc=1 state=1 desired_enabled=1
00:00:00.588 [DEBUG] [wlr] [backend/drm/drm.c:1174] 'HDMI-A-1' crtc=-1 state=0 desired_enabled=0
00:00:00.588 [DEBUG] [wlr] [backend/drm/drm.c:1174] 'HDMI-A-2' crtc=-1 state=0 desired_enabled=0
00:00:00.588 [DEBUG] [wlr] [backend/drm/drm.c:1174] 'DVI-D-1' crtc=-1 state=0 desired_enabled=0
where DP-1 is than disabled. After suspend/resume, allocation turns into:
00:30:22.680 [DEBUG] [wlr] [backend/drm/drm.c:1099] Reallocating CRTCs
00:30:22.680 [DEBUG] [wlr] [backend/drm/drm.c:1110] State before reallocation:
00:30:22.680 [DEBUG] [wlr] [backend/drm/drm.c:1116] 'DP-1' crtc=-1 state=1 desired_enabled=0
00:30:22.680 [DEBUG] [wlr] [backend/drm/drm.c:1116] 'DP-2' crtc=1 state=3 desired_enabled=1
00:30:22.680 [DEBUG] [wlr] [backend/drm/drm.c:1116] 'HDMI-A-1' crtc=-1 state=0 desired_enabled=0
00:30:22.680 [DEBUG] [wlr] [backend/drm/drm.c:1116] 'HDMI-A-2' crtc=-1 state=0 desired_enabled=0
00:30:22.680 [DEBUG] [wlr] [backend/drm/drm.c:1116] 'DVI-D-1' crtc=-1 state=0 desired_enabled=0
00:30:22.680 [DEBUG] [wlr] [backend/drm/drm.c:1167] State after reallocation:
00:30:22.680 [DEBUG] [wlr] [backend/drm/drm.c:1174] 'DP-1' crtc=-1 state=1 desired_enabled=0
00:30:22.680 [DEBUG] [wlr] [backend/drm/drm.c:1174] 'DP-2' crtc=1 state=3 desired_enabled=1
00:30:22.680 [DEBUG] [wlr] [backend/drm/drm.c:1174] 'HDMI-A-1' crtc=-1 state=0 desired_enabled=0
00:30:22.680 [DEBUG] [wlr] [backend/drm/drm.c:1174] 'HDMI-A-2' crtc=-1 state=0 desired_enabled=0
00:30:22.680 [DEBUG] [wlr] [backend/drm/drm.c:1174] 'DVI-D-1' crtc=-1 state=0 desired_enabled=0
where the crtc for DP-1 is now NULL. Trying to enable the output results
in:
10:43:36.906 [DEBUG] [sway/config/output.c:351] Turning on output DP-1
10:43:36.906 [DEBUG] [sway/config/output.c:360] Set preferred mode
10:43:36.906 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.906 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.906 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.906 [DEBUG] [sway/config/output.c:366] Preferred mode rejected, falling back to another mode
10:43:36.906 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.906 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.906 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.906 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.906 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.906 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.906 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.906 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.906 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.906 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.906 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.906 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.906 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.906 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.906 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.906 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.906 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.906 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.906 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.906 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.906 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.906 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.906 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.906 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.906 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.906 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.906 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.906 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.906 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.906 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.906 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.906 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.906 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.906 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.906 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.906 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.906 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.906 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.906 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.906 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.906 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.906 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.906 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.906 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.906 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.906 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [DEBUG] [sway/config/output.c:400] Auto-detected output scale: 1.000000
10:43:36.907 [DEBUG] [sway/config/output.c:430] Committing output DP-1
10:43:36.907 [DEBUG] [wlr] [backend/drm/drm.c:464] connector DP-1: Can't enable an output without a buffer
10:43:36.907 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
10:43:36.907 [ERROR] [wlr] [types/wlr_output.c:512] Failed to get primary display formats
10:43:36.907 [ERROR] [sway/config/output.c:435] Failed to commit output DP-1
where the primary format can't be queried since there is no crtc
allocated for the connector. Allocating the connector inside
drm_connector_get_primary_formats() fixes this issue. This is possible
since the only user of get_primary_formats() is the swapchain allocation
function, which is only called on output enable. Do the same thing for
the cursor formats in case the user queries them before the output is
enabled.
This allows the kernel to access our buffer damage. Some drivers
can take advantage of this, e.g. for PSR2 panels (Panel Self
Refresh) or for transfer over USB.
Closes: https://github.com/swaywm/wlroots/issues/1267
This reverts commit 85757665e6.
We now check if the output is enabled within wlr_output_send_frame, no
need to handle this explicitly in the DRM backend. This also fixes a
race which was introduced with this commit: if we schedule the flip,
disable and commit the output before the flip happens,
output.frame_pending will not be reset to false. We than always fail to
enable the output subsequently:
00:07:13.276 [INFO] [sway/commands.c:257] Handling command 'output DP-2 enable'
00:07:13.276 [DEBUG] [sway/commands.c:428] Subcommand: enable
00:07:13.276 [DEBUG] [sway/config/output.c:204] Merging on top of existing output config
00:07:13.276 [DEBUG] [sway/config/output.c:227] Config stored for output DP-2 (enabled: 1) (-1x-1@-1.000000Hz position 0,0 scale -1.000000 subpixel unknown transform -1) (bg /home/phoenix/Pictures/Wallpapers/mine/oper.jpg fill) (dpms 1) (max render time: -1)
00:07:13.276 [DEBUG] [sway/config/output.c:351] Turning on output DP-2
00:07:13.276 [DEBUG] [sway/config/output.c:360] Set preferred mode
00:07:13.276 [DEBUG] [wlr] [backend/drm/drm.c:465] connector DP-2: Can't enable an output without a buffer
00:07:13.276 [DEBUG] [wlr] [types/wlr_output.c:689] Attaching empty buffer to output for modeset
00:07:13.277 [DEBUG] [sway/config/output.c:329] Output DPI: 162.560000x161.364706
00:07:13.277 [DEBUG] [sway/config/output.c:400] Auto-detected output scale: 1.000000
00:07:13.277 [DEBUG] [sway/config/output.c:430] Committing output DP-2
00:07:13.277 [DEBUG] [wlr] [types/wlr_output.c:729] Tried to commit a buffer while a frame is pending
since the basic_output_test will always fail.
Reset frame_pending to false even if the output has been disabled in the
meantime.
Fixes https://github.com/swaywm/wlroots/issues/3109
When testing a modeset, make sure the caller has also provided a
buffer. This allows df0e75ba05 ("output: try skipping buffer
allocation if the backend allows it") to work as expected with the
DRM backend.
Closes: https://github.com/swaywm/wlroots/issues/3086
Unless we're dealing with a multi-GPU setup and the backend being
initialized is secondary, we don't need a renderer nor an allocator.
Stop initializing these.
Historically we haven't allowed direct scan-out for legacy KMS,
because legacy misses the functionality to make sure a buffer can
be scanned out. However with renderer v6 the backend can't figure
out anymore whether the buffer comes from its internal swap-chain,
because the backend doesn't have an internal swap-chain.
The legacy KMS API guarantees that the driver won't reject a buffer
as long as it's been allocated with the same parameters as the
previous one. Let's check this in legacy_crtc_test.
This is the cause of the spurious "drmHandleEvent failed" messages
at exit. restore_drm_outputs calls handle_drm_event in a loop without
checking whether the FD is readable, so drmHandleEvent ends up with a
short read (0 bytes) and returns an error.
The loop's goal is to wait for all queued page-flip events to complete,
to allow drmModeSetCrtc calls to succeed without EBUSY. The
drmModeSetCrtc calls are supposed to restore whatever KMS state we were
started with. But it's not clear from my PoV that restoring the KMS
state on exit is desirable.
KMS clients are supposed to save and restore the (full) KMS state on VT
switch, but not on exit. Leaving our KMS state on exit avoids unnecessary
modesets and allows flicker-free transitions between clients. See [1]
for more details, and note that with Pekka we've concluded that a new
flag to reset some KMS props to their default value on compositor
start-up is the best way forward. As a side note, Weston doesn't restore
the CRTC by does disable the cursor plane on exit (see
drm_output_deinit_planes, I still think disabling the cursor plane
shouldn't be necessary on exit).
Additionally, restore_drm_outputs only a subset of the KMS state.
Gamma and other atomic properties aren't accounted for. If the previous
KMS client had some outputs disabled, restore_drm_outputs would restore
a garbage mode.
[1]: https://blog.ffwll.ch/2016/01/vt-switching-with-atomic-modeset.html
wl_event_loop_add_fd was called with a NULL data argument, but the
function expects the data argument to be set to the wlr_drm_backend.
Fixes: 053ebe7c27 ("backend/drm: terminate display on drmHandleEvent failure")
Right now callers of drm_crtc_commit need to check whether the
interface is legacy or atomic before passing the TEST_ONLY flag.
Additionally, the fallbacks for legacy are in-place in the common
code.
Add a test_only arg to the crtc_commit hook. This way, there's no
risk to pass atomic-only flags to the legacy function (add an assert
to ensure this) and all of the legacy-specific logic can be put back
into legacy.c (done in next commit).
drm_surface_make_current and drm_surface_unset_current set implicit
state and are an unnecessary mid-layer. Prefer to use directly
wlr_renderer_begin_with_buffer, which automatically unsets the back
buffer on wlr_renderer_end.
I'd like to get rid of drm_surface_make_current once we stop using
it for the primary swapchain.
Some buffers need to be copied across GPUs. Such buffers need to be
allocated with a format and modifier suitable for both the source
and the destination.
When explicit modifiers aren't supported, we were forcing the buffers
to be allocated with a linear layout, because implicit modifiers
aren't portable across GPUs. All is well with this case.
When explicit modifiers are supported, we were advertising the whole
list of destination modifiers, in the hope that the source might
have some in common and might be able to allocate a buffer with a
more optimized layout. This works well if the source supports explicit
modifiers. However, if the source doesn't, then wlr_drm_format_intersect
will fallback to implicit modifiers, and everything goes boom: the
source uses a GPU-specific tiling and the destination interprets it
as linear.
To avoid this, just force linear unconditionally. We'll be able to
revert this once we have a good way to indicate that an implicit modifier
isn't supported in wlr_drm_format_set, see [1].
[1]: https://github.com/swaywm/wlroots/pull/2815
Closes: https://github.com/swaywm/wlroots/issues/3030
The previous fix tried to side-step cursor->pending_fb completely.
However that messes up our buffer locking mechanism.
Instead, stop clearing the pending cursor FB on a failed commit. The
pending cursor FB will remain for the next commit.
Fixes: 6c3d080e25 ("backend/drm: populate cursor plane's current_fb")
This reverts commit 6c3d080e25.
Populating wlr_drm_plane.current_fb messes up the buffer's locking.
The previous buffer is released while it's still being displayed
on-screen.
Custom backends and renderers need to implement
wlr_backend_impl.get_buffer_caps and
wlr_renderer_impl.get_render_buffer_caps. They can't if enum
wlr_buffer_cap isn't made public.
Right now, when a new output state field is added, all backends by
default won't reject it. This means we need to add new checks to
each and every backend when we introduce a new state field.
Instead, introduce a bitmask of supported output state fields in
each backend, and error out if the user has submitted an unknown
field.
Some fields don't need any backend involvment to work. These are
listed in WLR_OUTPUT_STATE_BACKEND_OPTIONAL as a convenience.
The set_cursor() hook is a little bit special: it's not really
synchronized to commit() or test(). Once set_cursor() returns true,
the new cursor is part of the current state.
This fixes a state where wlr_drm_connector.cursor_enabled is true
but there is no FB available. This is triggered by set_cursor()
followed by a failed commit(), which resets pending_fb.
We should definitely fix the output interface to make the cursor part
of the pending state, but that's a more involved change.
Instead of trying to perform a real modeset in init_renderer,
perform an atomic test-only commit to find out whether disabling
modifiers is necessary because of bandwidth limitations.
This decouples init_renderer from the actual commit, making it
possible to modeset an output with a user-supplied buffer instead
of a black frame.
We loose the ability to make sure the buffers coming from the
swapchain will work fine when using the legacy interface. This
can break i915 when atomic is disabled and modifiers enabled.
But i915 always has atomic (so the user must explicitly disable it
to run into potential bandwidth limitations) and is the only known
problematic driver.
Instead of passing a wlr_texture to the backend, directly pass a
wlr_buffer. Use get_cursor_size and get_cursor_formats to create
a wlr_buffer that can be used as a cursor.
We don't want to pass a wlr_texture because we want to remove as
many rendering bits from the backend as possible.
This new functions cleans up the common backend state. While this
currently only emits the destroy signal, this will also clean up
the renderer and allocator in upcoming patches.
Backend-initiated mode changes can use this function instead of
going through drm_connector_set_mode. drm_connector_set_mode becomes
a mere drm_connector_commit_state helper.
Replace it with a new drm_connector_state_is_modeset function that
decides whether a modeset is necessary directly from the
wlr_output_state which is going to be applied.
Populate the wlr_output_state when setting a mode. This will allow
drm_connector_set_mode to stop relying on ephemeral fields in
wlr_drm_crtc. Also drm_connector_set_mode will be able to apply
both a new buffer and a new mode atomically.
Stop assuming that the state to be applied is in output->pending in
crtc_commit. This will allow us to remove ephemeral fields in
wlr_drm_crtc, which are used scratch fields to stash temporary
per-commit data.
On multi-GPU setups, there is a primary DRM backend and secondary
DRM backends. wlr_backend_get_drm_fd will always return the parent
DRM FD even on secondary backends, so that users always use the
primary device for rendering.
However, for our internal rendering we want to use the secondary
device. Use allocator_autocreate_with_drm_fd to make sure the
allocator will create buffers on the secondary device.
We do something similar to ensure our internal rendering will
happen on the secondary device with renderer_autocreate_with_drm_fd.
Fixes: cc1b66364c ("backend: use wlr_allocator_autocreate")
This function is only required because the DRM backend still needs
to perform multi-GPU magic under-the-hood. Remove the wlr_ prefix
to make it clear it's not a candidate for being made public.
This reverts commit f9f90b4173.
gbm_bo_get_modifier may return a modifier in these cases:
- The kernel doesn't support modifiers but Mesa does
- WLR_DRM_NO_MODIFIERS=1 is set
However, in both of these cases, the gbm_bo has been allocated
without modifiers.
There is already a check in drm_fb_create for modifiers:
wlr_drm_format_set_has will make sure buffers with an explicit
modifier will be rejected if the DRM backend doesn't support them.
So no need for an additional check in get_fb_for_bo.
Closes: https://github.com/swaywm/wlroots/issues/2896
The previous code would always print "falling back to legacy method",
even if the format wasn't ARGB8888.
Drop get_fb_for_bo_legacy, since the code can just be inlined without
hurting readability.
Ideally we should only fallback to drmModeAddFB if the error code
indicates the BE failure, but the original PR [1] doesn't say what
error code is returned by the kernel.
[1]: https://github.com/swaywm/wlroots/pull/2569
We shouldn't strip a modifiers from buffers, because the will make
the kernel re-interpret the data as LINEAR on most drivers,
resulting in an incorrect output on screen.
PRIME support for buffer sharing has become mandatory since the renderer
rewrite. Make sure we check for the appropriate capabilities in backend,
allocator and renderer.
See also #2819.
Downgrade errors to DEBUG level, because drm_fb_create is used in
test_buffer, so errors aren't always fatal. Add ERROR logs at call
sites where a failure is fatal, to make it clear something wrong
happened.
If the import to KMS succeeds, we have a better chance to be able to
scan it out.
Importing is also necessary for test-only commits, which we want to
add in the future.
Compute only the transform matrix in the output. The projection matrix
will be calculated inside the gles2 renderer when we start rendering.
The goal is to help the pixman rendering process.
In 93cd3a79b2 ("backend/drm: stop using GBM flags"), we stopped
using the GBM_BO_USE_LINEAR flag in favor of a modifier list set
to { DRM_FORMAT_MOD_LINEAR }. However, the last argument of
drm_plane_init_surface disables modifiers -- so the buffer will just
get allocated with an implicit modifier, without necessarily being
LINEAR.
To fix this, allow modifiers when allocating the cursor buffers.
wlr_drm_plane.formats should already have the necessary LINEAR
restrictions.
Fixes: 93cd3a79b2 ("backend/drm: stop using GBM flags")
This allows a compositor to get a KMS connector object ID from a
wlr_output. The compositor can then query more information about
the connector via libdrm.
This gives more freedom to compositors and allows them to read
KMS properties that wlroots doesn't know about. For instance,
they could read the EDID or the suggested_{X,Y} properties and
change their output configuration based on that.
The subconnector property indicates the connector sub-type. This is
useful because that usually indicates what kind of connector the user
has plugged in to their monitor, e.g. a DisplayPort-to-DVI cable will
indicate a DVI subconnector. Also some laptops have non-DP connectors
that are internally linked to a DP port on the GPU.
Set the output description accordingly.
See https://drmdb.emersion.fr/properties/3233857728/subconnector
The new wlr_renderer_autocreate API is great for compositors, however
it causes some issues with DRM multi-GPU support.
A DRM child backend wants the compositor to use the parent GPU, so it
exposes the parent's DRM FD in get_drm_fd. However, in order to be able
to perform multi-GPU buffer copies, the child DRM backend still needs to
create a local renderer.
Use the new private wlr_renderer_autocreate_with_drm_fd function to
avoid creating a renderer for the parent GPU.
Fixes: e128e6c08d ("render: drop egl parameters from wlr_renderer_autocreate")
Instead of requiring callers to manually make the EGL context current
before binding a buffer and unsetting it after unbinding a buffer, do
it inside wlr_renderer_bind_buffer.
This hides renderer-specific implementation details inside the
wlr_renderer interface. Non-GLES2 renderers may not use EGL.
This removes all EGL dependencies from the backends.
References: https://github.com/swaywm/wlroots/issues/2618
References: https://github.com/swaywm/wlroots/pull/2615#issuecomment-756687006
Since 5b1b43c68c ("backend/drm: make wlr_drm_plane.{pending,queued,current}_fb
pointers"), current_fb can be NULL if there's no buffer. If current_fb
is not NULL, current_fb->wlr_buf is guaranteed to not be NULL.
Closes: https://github.com/swaywm/wlroots/issues/2634
Stop using wlr_drm_surface.{width,height} to figure out the size of a
gbm_bo. In the future we'll stop using wlr_drm_plane.surf, so these will
be zero. Instead, rely on gbm_bo_get_{width,height}.
Stop keeping track of buffers on the parent GPU when multi-GPU is used.
This removes support for export_dmabuf on secondary GPUs, but renderer
v6 will bring this back by managing the swapchains in wlr_output instead
of the backends.
wlr_drm_connector.crtc may be updated by the DRM backend while a
page-flip is pending. In this case, the page-flip handler won't be able
to find the right wlr_drm_connector from the CRTC ID.
Save the CRTC when performing a page-flip to ensure we always find the
right connector when we get the event.
When the session is inactive, we can't change the KMS state. Ignore
hotplug events so that compositors don't try to perform a modeset when
a connector is plugged in. We already re-scan connectors when the
session becomes active.
To test, run a wlroots compositor on VT 1, switch to VT 2, unplug a
connector, re-plug it, switch back to VT 1. Without this patch the
screen is black on VT 1.
References: https://github.com/swaywm/wlroots/issues/2370
This callback allowed compositors to customize the EGL config used by
the renderer. However with renderer v6 EGL configs aren't used anymore.
Instead, buffers are allocated via GBM and GL FBOs are rendered to. So
customizing the EGL config is a no-op.
We now properly mark the cursor plane's formats as linear-only, and we
now have a version of wlr_drm_format_intersect that handles the case of
linear-only formats and implicit modifiers.
We can remove the special drm_plane_init_surface flag we had for cursor
planes. This also allows us to use a non-linear layout for cursor planes
on drivers that support it.
Tested on amdgpu GFX9.
If the kernel driver doesn't support modifiers, it still expects cursor
FBs to have a LINEAR layout. See [1] for expectations for framebuffers
attached to the cursor plane.
[1]: https://patchwork.freedesktop.org/patch/408512/
Parse WLR_DRM_NO_MODIFIERS at startup. Don't parse IN_FORMATS when
WLR_DRM_NO_MODIFIERS is set, so that the legacy behaviour is better
reproduced.
When modifiers aren't supported, try the initial page-flip once only.
This was lost during the refactoring. We were previously calling
wlr_output_destroy, which destroyed the connector as well.
Fixes: 248c7787c7 ("backend/drm: refactor wlr_output destruction")
The DRM backend is a little special when it comes to wlr_outputs: the
wlr_drm_connectors are long-lived and are created even when no screen is
connected.
A wlr_drm_connector only advertises a wlr_output to the compositor when
a screen is connected. As such, most of wlr_output's state is invalid
when the connector is disconnected.
We want to stop using wlr_output state on disconnected connectors.
Introduce wlr_drm_connector.name which is always valid regardless of the
connector status to avoid reading wlr_output.name when disconnected.
Simplify and unify connector-specific logging with a new
wlr_drm_conn_log macro. This makes it easier to understand which
connector a failure is about, without having to explicitly integrate the
connector name in each log message.
The workaround is broken because drm_fb_acquire doesn't leave the EGL
context current anymore. We'll need to re-introduce it.
References: https://github.com/swaywm/wlroots/issues/2525
gbm_bo_create_with_modifiers doesn't take GBM flags, so our
wlr_gbm_allocator interface doesn't either. We were still internally
using GBM flags in the DRM backend, leading to awkward back-and-forth
conversions.
The only flag passed to drm_plane_init_surface was GBM_BO_USE_LINEAR, so
turn that into a bool to make sure other flags can't be passed in.
Move the "force linear" logic out of init_drm_surface, because the
supplied wlr_drm_format should already contain that information.
drm_fb_import_wlr may need to change the current EGL context. For
instance by calling drm_fb_clear, which calls wlr_buffer_unlock, which
may destroy a buffer if the cursor swapchain size has changed, which
calls gles2's destroy_buffer, which calls glDeleteFramebuffers.
Closes: https://github.com/swaywm/wlroots/issues/2479
This is just the vendor-agnostic define for the GBM platform. It has the
same value as EGL_PLATFORM_GBM_MESA, so should work with old drivers
that only offer the Mesa-vendored extension too.
On some platforms it's possible that the display engine supports
modifiers not supported by the render engine.
Query render formats and intersect them with plane formats to accommodate
for this.
After discussing with Pekka and Daniel on #dri-devel, we concluded [1]
that user-space shouldn't need to force-probe connectors. Force-probing
can take some time, so using drmModeGetConnectorCurrent can result in
faster start-up.
Users can manually trigger a force-probe if necessary:
echo detect | sudo tee /sys/class/drm/card0-DP-1/status
Or just by running a tool like drm_info.
A similar change has been submitted to Weston [2].
[1]: https://lists.freedesktop.org/archives/dri-devel/2020-November/287728.html
[2]: https://gitlab.freedesktop.org/wayland/weston/-/issues/437
Instead of operating on FDs in {open,close}_device, operate on
wlr_devices. This avoids the device lookup in wlr_session and allows
callers to have access to wlr_device fields.
For now, we use it to remove wlr_session_signal_add and replace it with
a more idiomatic wlr_session.events.change field. In the future, other
events will be added.
We would always return the GAMMA_LUT_SIZE property if available, and
only fall back to legacy gamma size otherwise. This leads to issues if
both are available in differs in size while we use the legacy backend.
Ensure that we only return the legacy size if we're using the legacy
backend.
Closes: https://github.com/swaywm/wlroots/issues/2429
When performing a modeset, the DRM backend will request a page-flip
event. However frame_pending wasn't set to true, so any subsequent
wlr_output_schedule_frame calls would imemdiately trigger a synthetic
frame event, asking the compositor to submit a new frame. Committing the
new frame fails with "a page-flip is already pending" error in the DRM
backend.
When an output is disabled one last pageflip will happen to disable it.
Currently this pageflip causes a frame event.
Since the output is disabled we don't want to send this frame event.
get_drm_prop_blob does not set path_len if it returns NULL. Check the
return value before path_len to avoid reading uninitialized memory.
(Granted, this doesn't change the logic at all, but it does make
Valgrind a bit happier.)
drm_connector_set_cursor wasn't checking the return value of the
drm_surface_make_current call. On failure, this results in a failed
assertion in wlr_renderer_begin (because no rendering context is
current).
The output backend API is now mostly state-less thanks to the atomic
hooks (commit and test). There is one exception though: attach_render.
This function makes the rendering context current. However sometimes the
compositor might decide not to render after attach_render (e.g. when
there's nothing new to render to the back buffer). Thus
wlr_output_rollback has been introduced to revert the pending state.
Because the output backend API is mostly state-less, the only thing
wlr_output_impl.rollback needs to do is revert the current rendering
context. Rename the function to rollback_render to make this clear. Add
a check in the common wlr_output code to only call rollback_render when
attach_buffer has been previously called.
On the long term, we'll be able to remove attach_render and
rollback_render together.
