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Currently we perform both short IRQ handling for DP, and connector
reprobing in the HPD IRQ handler. However since we need to grab
connection_mutex in order to reprobe a connector, in theory we could
accidentally block ourselves from handling any short IRQs until after a
modeset completes if a connector hotplug happens to occur in parallel
with a modeset.
I haven't seen this actually happen yet, but since we're cleaning up
nouveau's hotplug handling code anyway and we already have a hpd worker,
we can simply fix this by only relying on the HPD worker to actually
reprobe connectors when we receive a HPD IRQ. We also add a mask to
nouveau_drm to keep track of which connectors are waiting to be reprobed
in response to an HPD IRQ.
Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200826182456.322681-13-lyude@redhat.com
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First some backstory here: Currently, we keep track of whether or not
we've enabled MST or not by trying to piggy-back off the MST helpers.
This means that in order to check whether MST is enabled or not, we
actually need to grab drm_dp_mst_topology_mgr.lock.
Back when I originally wrote this, I did this piggy-backing with the
intention that I'd eventually be teaching our MST helpers how to recover
when an MST device has stopped responding, which in turn would require
the MST helpers having a way of disabling MST independently of the
driver. Note that this was before I reworked locking in the MST helpers,
so at the time we were sticking random things under &mgr->lock - which
grabbing this lock was meant to protect against.
This never came to fruition because doing such a reset safely turned out
to be a lot more painful and impossible then it sounds, and also just
risks us working around issues with our MST handlers that should be
properly fixed instead. Even if it did though, simply calling
drm_dp_mst_topology_mgr_set_mst() from the MST helpers (with the
exception of when we're tearing down our MST managers, that's always OK)
wouldn't have been a bad idea, since drivers like nouveau and i915 need
to do their own book keeping immediately after disabling MST.
So-implementing that would likely require adding a hook for
helper-triggered MST disables anyway.
So, fast forward to now - we want to start adding support for all of the
miscellaneous bits of the DP protocol (for both SST and MST) we're
missing before moving on to supporting more complicated features like
supporting different BPP values on MST, DSC, etc. Since many of these
features only exist on SST and make use of DP HPD IRQs, we want to be
able to atomically check whether we're servicing an MST IRQ or SST IRQ
in nouveau_connector_hotplug(). Currently we literally don't do this at
all, and just handle any kind of possible DP IRQ we could get including
ESIs - even if MST isn't actually enabled.
This would be very complicated and difficult to fix if we need to hold
&mgr->lock while handling SST IRQs to ensure that the MST topology
state doesn't change under us. What we really want here is to do our own
tracking of whether MST is enabled or not, similar to drivers like i915,
and define our own locking order to decomplicate things and avoid
hitting locking issues in the future.
So, let's do this by refactoring our MST probing/enabling code to use
our own MST bookkeeping, along with adding a lock for protecting DP
state that needs to be checked outside of our connector probing
functions. While we're at it, we also remove a bunch of unneeded steps
we perform when probing/enabling MST:
* Enabling bits in MSTM_CTRL before calling drm_dp_mst_topology_mgr_set_mst().
I don't think these ever actually did anything, since the nvif methods
for enabling MST don't actually do anything DPCD related and merely
indicate to nvkm that we've turned on MST.
* Checking the MSTM_CTRL bit is intact when checking the state of an
enabled MST topology in nv50_mstm_detect(). I just added this to be safe
originally, but now that we try reading the DPCD when probing DP
connectors it shouldn't be needed as that will abort our hotplug probing
if the device was removed well before we start checking for MST..
* All of the duplicate DPCD version checks.
This leaves us with much nicer looking code, a much more sensible
locking scheme, and an easy way of checking whether MST is enabled or
not for handling DP HPD IRQs.
v2:
* Get rid of accidental newlines
v4:
* Fix uninitialized usage of mstm in nv50_mstm_detect() - thanks kernel
bot!
Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200826182456.322681-9-lyude@redhat.com
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I need to backmerge 5.8 as I've got a bunch of fixes sitting
on an rc7 base that I want to land.
Signed-off-by: Dave Airlie <airlied@redhat.com>
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Accept the DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK()
family of modifiers to handle broken userspace
Xorg modesetting and Mesa drivers. Existing Mesa
drivers are still aware of only these older
format modifiers which do not differentiate
between different variations of the block linear
layout. When the format modifier support flag was
flipped in the nouveau kernel driver, the X.org
modesetting driver began attempting to use its
format modifier-enabled framebuffer path. Because
the set of format modifiers advertised by the
kernel prior to this change do not intersect with
the set of format modifiers advertised by Mesa,
allocating GBM buffers using format modifiers
fails and the modesetting driver falls back to
non-modifier allocation. However, it still later
queries the modifier of the GBM buffer when
creating its DRM-KMS framebuffer object, receives
the old-format modifier from Mesa, and attempts
to create a framebuffer with it. Since the kernel
is still not aware of these formats, this fails.
Userspace should not be attempting to query format
modifiers of GBM buffers allocated with a non-
format-modifier-aware allocation path, but to
avoid breaking existing userspace behavior, this
change accepts the old-style format modifiers when
creating framebuffers and applying them to planes
by translating them to the equivalent new-style
modifier. To accomplish this, some layout
parameters must be assumed to match properties of
the device targeted by the relevant ioctls. To
avoid perpetuating misuse of the old-style
modifiers, this change does not advertise support
for them. Doing so would imply compatibility
between devices with incompatible memory layouts.
Tested with Xorg 1.20 modesetting driver,
weston@c46c70dac84a4b3030cd05b380f9f410536690fc,
gnome & KDE wayland desktops from Ubuntu 18.04,
and sway 1.5
Reported-by: Kirill A. Shutemov <kirill@shutemov.name>
Fixes: fa4f4c213f5f ("drm/nouveau/kms: Support NVIDIA format modifiers")
Link: https://lkml.org/lkml/2020/6/30/1251
Signed-off-by: James Jones <jajones@nvidia.com>
Acked-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
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Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
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This introduces support for CRC readback on gf119+, using the
documentation generously provided to us by Nvidia:
https://github.com/NVIDIA/open-gpu-doc/blob/master/Display-CRC/display-crc.txt
We expose all available CRC sources. SF, SOR, PIOR, and DAC are exposed
through a single set of "outp" sources: outp-active/auto for a CRC of
the scanout region, outp-complete for a CRC of both the scanout and
blanking/sync region combined, and outp-inactive for a CRC of only the
blanking/sync region. For each source, nouveau selects the appropriate
tap point based on the output path in use. We also expose an "rg"
source, which allows for capturing CRCs of the scanout raster before
it's encoded into a video signal in the output path. This tap point is
referred to as the raster generator.
Note that while there's some other neat features that can be used with
CRC capture on nvidia hardware, like capturing from two CRC sources
simultaneously, I couldn't see any usecase for them and did not
implement them.
Nvidia only allows for accessing CRCs through a shared DMA region that
we program through the core EVO/NvDisplay channel which is referred to
as the notifier context. The notifier context is limited to either 255
(for Fermi-Pascal) or 2047 (Volta+) entries to store CRCs in, and
unfortunately the hardware simply drops CRCs and reports an overflow
once all available entries in the notifier context are filled.
Since the DRM CRC API and igt-gpu-tools don't expect there to be a limit
on how many CRCs can be captured, we work around this in nouveau by
allocating two separate notifier contexts for each head instead of one.
We schedule a vblank worker ahead of time so that once we start getting
close to filling up all of the available entries in the notifier
context, we can swap the currently used notifier context out with
another pre-prepared notifier context in a manner similar to page
flipping.
Unfortunately, the hardware only allows us to this by flushing two
separate updates on the core channel: one to release the current
notifier context handle, and one to program the next notifier context's
handle. When the hardware processes the first update, the CRC for the
current frame is lost. However, the second update can be flushed
immediately without waiting for the first to complete so that CRC
generation resumes on the next frame. According to Nvidia's hardware
engineers, there isn't any cleaner way of flipping notifier contexts
that would avoid this.
Since using vblank workers to swap out the notifier context will ensure
we can usually flush both updates to hardware within the timespan of a
single frame, we can also ensure that there will only be exactly one
frame lost between the first and second update being executed by the
hardware. This gives us the guarantee that we're always correctly
matching each CRC entry with it's respective frame even after a context
flip. And since IGT will retrieve the CRC entry for a frame by waiting
until it receives a CRC for any subsequent frames, this doesn't cause an
issue with any tests and is much simpler than trying to change the
current DRM API to accommodate.
In order to facilitate testing of correct handling of this limitation,
we also expose a debugfs interface to manually control the threshold for
when we start trying to flip the notifier context. We will use this in
igt to trigger a context flip for testing purposes without needing to
wait for the notifier to completely fill up. This threshold is reset
to the default value set by nouveau after each capture, and is exposed
in a separate folder within each CRTC's debugfs directory labelled
"nv_crc".
Changes since v1:
* Forgot to finish saving crc.h before saving, whoops. This just adds
some corrections to the empty function declarations that we use if
CONFIG_DEBUG_FS isn't enabled.
Changes since v2:
* Don't check return code from debugfs_create_dir() or
debugfs_create_file() - Greg K-H
Changes since v3:
(no functional changes)
* Fix SPDX license identifiers (checkpatch)
* s/uint32_t/u32/ (checkpatch)
* Fix indenting in switch cases (checkpatch)
Changes since v4:
* Remove unneeded param changes with nv50_head_flush_clr/set
* Rebase
Changes since v5:
* Remove set but unused variable (outp) in nv50_crc_atomic_check() -
Kbuild bot
Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Acked-by: Dave Airlie <airlied@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200627194657.156514-10-lyude@redhat.com
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drm-misc-next for v5.9:
UAPI Changes:
- Add DRM_MODE_TYPE_USERDEF for video modes specified in cmdline.
Cross-subsystem Changes:
- Assorted devicetree binding updates.
- Add might_sleep() to dma_fence_wait().
- Fix fbdev's get_user_pages_fast() handling, and use pin_user_pages.
- Small cleanup with IS_BUILTIN in video/fbdev drivers.
- Fix video/hdmi coding style for infoframe size.
Core Changes:
- Silence vblank output during init.
- Fix DP-MST corruption during send msg timeout.
- Clear leak in drm_gem_objecs_lookup().
- Make newlines work with force connector attribute.
- Fix module refcounting error in drm_encoder_slave, and use new i2c api.
- Header fix for drm_managed.c
- More struct_mutex removal for !legacy drivers:
- Remove gem_free_object()
- Removal of drm_gem_object_put_unlocked().
- Show current->comm alongside pid in debug printfs.
- Add drm_client_modeset_check() + drm_client_framebuffer_flush().
- Replace drm_fb_swab16 with drm_fb_swap that also supports 32-bits.
- Remove mode->vrefresh, and compactify drm_display_mode.
- Use drm_* macros for logging and warnings.
- Add WARN when drm_gem_get_pages is used on a private obj.
- Handle importing and imported dmabuf better in shmem helpers.
- Small fix for drm/mm hole size comparison, and remove invalid entry optimization.
- Add a drm/mm selftest.
- Set DSI connector type for DSI panels.
- Assorted small fixes and documentation updates.
- Fix DDI I2C device registration for MST ports, and flushing on destroy.
- Fix master_set return type, used by vmwgfx.
- Make the drm_set/drop_master ioctl symmetrical.
Driver Changes:
Allow iommu in the sun4i driver and use it for sun8i.
- Simplify backlight lookup for omap, amba-clcd and tilcdc.
- Hold reg_lock for rockchip.
- Add support for bridge gpio and lane reordering + polarity to ti-sn65dsi86, and fix clock choice.
- Small assorted fixes to tilcdc, vc4, i915, omap, fbdev/sm712fb, fbdev/pxafb, console/newport_con, msm, virtio, udl, malidp, hdlcd, bridge/ti-sn65dsi86, panfrost.
- Remove hw cursor support for mgag200, and use simple kms helper + shmem helpers.
- Add support for KOE Allow iommu in the sun4i driver and use it for sun8i.
- Simplify backlight lookup for omap, amba-clcd and tilcdc.
- Hold reg_lock for rockchip.
- Add support for bridge gpio and lane reordering + polarity to ti-sn65dsi86, and fix clock choice.
- Small assorted fixes to tilcdc, vc4 (multiple), i915.
- Remove hw cursor support for mgag200, and use simple kms helper + shmem helpers.
- Add support for KOE TX26D202VM0BWA panel.
- Use GEM CMA functions in arc, arm, atmel-hlcdc, fsi-dcu, hisilicon, imx, ingenic, komeda, malidp, mcde, meson, msxfb, rcar-du, shmobile, stm, sti, tilcdc, tve200, zte.
- Remove gem_print_info.
- Improve gem_create_object_helper so udl can use shmem helpers.
- Convert vc4 dt bindings to schemas, and add clock properties.
- Device initialization cleanups for mgag200.
- Add a workaround to fix DP-MST short pulses handling on broken hardware in i915.
- Allow build test compiling arm drivers.
- Use managed pci functions in mgag200 and ast.
- Use dev_groups in malidp.
- Add per pixel alpha support for PX30 VOP in rockchip.
- Silence deferred probe logs in panfrost.
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/001cd9a6-405d-4e29-43d8-354f53ae4e8b@linux.intel.com
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Allow setting the block layout of a nouveau FB
object using DRM format modifiers. When
specified, the format modifier block layout and
kind overrides the GEM buffer's implicit layout
and kind. The specified format modifier is
validated against the list of modifiers supported
by the target display hardware.
v2: Used Tesla family instead of NV50 chipset compare
v4: Do not cache kind, tile_mode in nouveau_framebuffer
v5: Resolved against nouveau_framebuffer cleanup
Signed-off-by: James Jones <jajones@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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Make sure framebuffer dimensions and tiling
parameters will not result in accesses beyond the
end of the GEM buffer they are bound to.
v3: Return EINVAL when creating FB against BO with
unsupported tiling
v5: Resolved against nouveau_framebuffer cleanup
Signed-off-by: James Jones <jajones@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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After its cleanup, struct nouveau_framebuffer is only a wrapper around
struct drm_framebuffer. Use the latter directly.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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The buffer object stored in nvbo is also available GEM object in obj[0]
of struct drm_framebuffer. Therefore remove nvbo in favor obj[0] and
replace all references accordingly. This may require an additional cast.
With this change we can already replace nouveau_user_framebuffer_destroy()
and nouveau_user_framebuffer_create_handle() with generic GEM helpers.
Calls to nouveau_framebuffer_new() receive a GEM object.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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Spelling out _unlocked for each and every driver is a annoying.
Especially if we consider how many drivers, do not know (or need to)
about the horror stories involving struct_mutex.
Just drop the suffix. It makes the API cleaner.
Done via the following script:
__from=drm_gem_object_put_unlocked
__to=drm_gem_object_put
for __file in $(git grep --name-only $__from); do
sed -i "s/$__from/$__to/g" $__file;
done
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20200515095118.2743122-26-emil.l.velikov@gmail.com
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VBLANK callbacks in struct drm_driver are deprecated in favor of
their equivalents in struct drm_crtc_funcs. Convert nouvean over.
v4:
* add argument names in function declaration
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200123135943.24140-10-tzimmermann@suse.de
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The callback struct drm_driver.get_scanout_position() is deprecated in
favor of struct drm_crtc_helper_funcs.get_scanout_position(). Convert
nouveau over.
v4:
* add argument names in function declaration
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200123135943.24140-9-tzimmermann@suse.de
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Currently, we enable hotplug detection only after we re-enable the
display. However, this is too late if we're planning on sending sideband
messages during the resume process - which we'll need to do in order to
reprobe the topology on resume.
So, enable hotplug events before reinitializing the display.
Cc: Juston Li <juston.li@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Harry Wentland <hwentlan@amd.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Sean Paul <sean@poorly.run>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191022023641.8026-11-lyude@redhat.com
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Drop use of the deprecated drmP.h file from drm/nouveau.
Build tested using allyesconfig and allmodconfig.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: nouveau@lists.freedesktop.org
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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Drop vma_node from ttm_buffer_object, use the gem struct
(base.vma_node) instead.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20190805140119.7337-9-kraxel@redhat.com
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Drop drm_gem_object from nouveau_bo, use the
ttm_buffer_object.base instead.
Build tested only.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Christian König <christian.koenig@amd.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20190805140119.7337-7-kraxel@redhat.com
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Commit 3a6536c51d5d ("drm/nouveau: Intercept ACPI_VIDEO_NOTIFY_PROBE")
added a definition of ACPI_VIDEO_NOTIFY_PROBE because <acpi/video.h> didn't
supply one. Later, commit eff4a751cce5 ("ACPI / video: Move
ACPI_VIDEO_NOTIFY_* defines to acpi/video.h") moved ACPI_VIDEO_NOTIFY_PROBE
and other definitions to <acpi/video.h>, so the copy in nouveau_display.c
is now unnecessary.
Remove the unnecessary definition from nouveau_display.c.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Hans de Goede <hdegoede@redhat.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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It has no relevance to the atomic path used by newer GPUs.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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It has no relevance to the atomic path used by newer GPUs.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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Having the probe helper stuff (which pretty much everyone needs) in
the drm_crtc_helper.h file (which atomic drivers should never need) is
confusing. Split them out.
To make sure I actually achieved the goal here I went through all
drivers. And indeed, all atomic drivers are now free of
drm_crtc_helper.h includes.
v2: Make it compile. There was so much compile fail on arm drivers
that I figured I'll better not include any of the acks on v1.
v3: Massive rebase because i915 has lost a lot of drmP.h includes, but
not all: Through drm_crtc_helper.h > drm_modeset_helper.h -> drmP.h
there was still one, which this patch largely removes. Which means
rolling out lots more includes all over.
This will also conflict with ongoing drmP.h cleanup by others I
expect.
v3: Rebase on top of atomic bochs.
v4: Review from Laurent for bridge/rcar/omap/shmob/core bits:
- (re)move some of the added includes, use the better include files in
other places (all suggested from Laurent adopted unchanged).
- sort alphabetically
v5: Actually try to sort them, and while at it, sort all the ones I
touch.
v6: Rebase onto i915 changes.
v7: Rebase once more.
Acked-by: Harry Wentland <harry.wentland@amd.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Acked-by: CK Hu <ck.hu@mediatek.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: virtualization@lists.linux-foundation.org
Cc: etnaviv@lists.freedesktop.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: intel-gfx@lists.freedesktop.org
Cc: linux-mediatek@lists.infradead.org
Cc: linux-amlogic@lists.infradead.org
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Cc: nouveau@lists.freedesktop.org
Cc: spice-devel@lists.freedesktop.org
Cc: amd-gfx@lists.freedesktop.org
Cc: linux-renesas-soc@vger.kernel.org
Cc: linux-rockchip@lists.infradead.org
Cc: linux-stm32@st-md-mailman.stormreply.com
Cc: linux-tegra@vger.kernel.org
Cc: xen-devel@lists.xen.org
Link: https://patchwork.freedesktop.org/patch/msgid/20190117210334.13234-1-daniel.vetter@ffwll.ch
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It's not a core function, and the matching atomic functions are also
not in the core. Plus the suspend/resume helper is also already there.
Needs a tiny bit of open-coding, but less midlayer beats that I think.
v2: Rebase onto ast (which gained a new user).
Cc: Sam Bobroff <sbobroff@linux.ibm.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Sean Paul <sean@poorly.run>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: "David (ChunMing) Zhou" <David1.Zhou@amd.com>
Cc: Rex Zhu <Rex.Zhu@amd.com>
Cc: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Cc: Huang Rui <ray.huang@amd.com>
Cc: Shaoyun Liu <Shaoyun.Liu@amd.com>
Cc: Monk Liu <Monk.Liu@amd.com>
Cc: nouveau@lists.freedesktop.org
Cc: amd-gfx@lists.freedesktop.org
Link: https://patchwork.freedesktop.org/patch/msgid/20181217194303.14397-4-daniel.vetter@ffwll.ch
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Currently module unloading is broken in nouveau due to a rather annoying
race condition resulting from nouveau_backlight.c having gone a bit
stale over time:
[ 1960.791143] ==================================================================
[ 1960.791394] BUG: KASAN: use-after-free in nouveau_backlight_exit+0x112/0x150 [nouveau]
[ 1960.791460] Read of size 4 at addr ffff88075accf350 by task zsh/11185
[ 1960.791521]
[ 1960.791545] CPU: 7 PID: 11185 Comm: zsh Kdump: loaded Tainted: G O 4.18.0Lyude-Test+ #4
[ 1960.791580] Hardware name: LENOVO 20EQS64N0B/20EQS64N0B, BIOS N1EET79W (1.52 ) 07/13/2018
[ 1960.791628] Call Trace:
[ 1960.791680] dump_stack+0xa4/0xfd
[ 1960.791721] print_address_description+0x71/0x239
[ 1960.791833] ? nouveau_backlight_exit+0x112/0x150 [nouveau]
[ 1960.791877] kasan_report.cold.6+0x242/0x2fe
[ 1960.791919] __asan_report_load4_noabort+0x19/0x20
[ 1960.792012] nouveau_backlight_exit+0x112/0x150 [nouveau]
[ 1960.792081] nouveau_display_destroy+0x76/0x150 [nouveau]
[ 1960.792150] nouveau_drm_device_fini+0xb7/0x190 [nouveau]
[ 1960.792265] nouveau_drm_device_remove+0x14b/0x1d0 [nouveau]
[ 1960.792347] ? nouveau_cli_work_queue+0x2e0/0x2e0 [nouveau]
[ 1960.792378] ? trace_hardirqs_on_caller+0x38b/0x570
[ 1960.792406] ? trace_hardirqs_on+0xd/0x10
[ 1960.792472] nouveau_drm_remove+0x37/0x50 [nouveau]
[ 1960.792502] pci_device_remove+0x112/0x2d0
[ 1960.792530] ? pcibios_free_irq+0x10/0x10
[ 1960.792558] ? kasan_check_write+0x14/0x20
[ 1960.792587] device_release_driver_internal+0x35c/0x650
[ 1960.792617] device_release_driver+0x12/0x20
[ 1960.792643] pci_stop_bus_device+0x172/0x1e0
[ 1960.792671] pci_stop_and_remove_bus_device_locked+0x1a/0x30
[ 1960.792715] remove_store+0xcb/0xe0
[ 1960.792753] ? sriov_numvfs_store+0x2e0/0x2e0
[ 1960.792779] ? __lock_is_held+0xb5/0x140
[ 1960.792808] ? component_add+0x530/0x530
[ 1960.792834] dev_attr_store+0x3f/0x70
[ 1960.792859] ? sysfs_file_ops+0x11d/0x170
[ 1960.792885] sysfs_kf_write+0x104/0x150
[ 1960.792915] ? sysfs_file_ops+0x170/0x170
[ 1960.792940] kernfs_fop_write+0x24f/0x400
[ 1960.792978] ? __lock_acquire+0x6ea/0x47f0
[ 1960.793021] __vfs_write+0xeb/0x760
[ 1960.793048] ? kernel_read+0x130/0x130
[ 1960.793076] ? __lock_is_held+0xb5/0x140
[ 1960.793107] ? rcu_read_lock_sched_held+0xdd/0x110
[ 1960.793135] ? rcu_sync_lockdep_assert+0x78/0xb0
[ 1960.793162] ? __sb_start_write+0x183/0x220
[ 1960.793189] vfs_write+0x14d/0x4a0
[ 1960.793229] ksys_write+0xd2/0x1b0
[ 1960.793255] ? __ia32_sys_read+0xb0/0xb0
[ 1960.793298] ? fput+0x1d/0x120
[ 1960.793324] ? filp_close+0xf3/0x130
[ 1960.793349] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[ 1960.793380] __x64_sys_write+0x73/0xb0
[ 1960.793407] do_syscall_64+0xaa/0x400
[ 1960.793433] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 1960.793460] RIP: 0033:0x7f59df433164
[ 1960.793486] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 8d 05 81 38 2d 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 49 89 d4 55 48 89 f5 53
[ 1960.793541] RSP: 002b:00007ffd70ee2fb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 1960.793576] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f59df433164
[ 1960.793620] RDX: 0000000000000002 RSI: 00005578088640c0 RDI: 0000000000000001
[ 1960.793665] RBP: 00005578088640c0 R08: 00007f59df7038c0 R09: 00007f59e0995b80
[ 1960.793696] R10: 000000000000000a R11: 0000000000000246 R12: 00007f59df702760
[ 1960.793730] R13: 0000000000000002 R14: 00007f59df6fd760 R15: 0000000000000002
[ 1960.793768]
[ 1960.793790] Allocated by task 11167:
[ 1960.793816] save_stack+0x43/0xd0
[ 1960.793841] kasan_kmalloc+0xc4/0xe0
[ 1960.793880] kasan_slab_alloc+0x11/0x20
[ 1960.793905] kmem_cache_alloc+0xd7/0x270
[ 1960.793944] getname_flags+0xbd/0x520
[ 1960.793969] user_path_at_empty+0x23/0x50
[ 1960.793994] do_faccessat+0x1fc/0x5d0
[ 1960.794018] __x64_sys_access+0x59/0x80
[ 1960.794043] do_syscall_64+0xaa/0x400
[ 1960.794067] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 1960.794093]
[ 1960.794127] Freed by task 11167:
[ 1960.794152] save_stack+0x43/0xd0
[ 1960.794190] __kasan_slab_free+0x139/0x190
[ 1960.794215] kasan_slab_free+0xe/0x10
[ 1960.794239] kmem_cache_free+0xcb/0x2c0
[ 1960.794264] putname+0xad/0xe0
[ 1960.794287] filename_lookup.part.59+0x1f1/0x360
[ 1960.794313] user_path_at_empty+0x3e/0x50
[ 1960.794338] do_faccessat+0x1fc/0x5d0
[ 1960.794362] __x64_sys_access+0x59/0x80
[ 1960.794393] do_syscall_64+0xaa/0x400
[ 1960.794421] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 1960.794461]
[ 1960.794483] The buggy address belongs to the object at ffff88075acceac0
[ 1960.794483] which belongs to the cache names_cache of size 4096
[ 1960.794540] The buggy address is located 2192 bytes inside of
[ 1960.794540] 4096-byte region [ffff88075acceac0, ffff88075accfac0)
[ 1960.794581] The buggy address belongs to the page:
[ 1960.794609] page:ffffea001d6b3200 count:1 mapcount:0 mapping:ffff880778e4b1c0 index:0x0 compound_mapcount: 0
[ 1960.794651] flags: 0x8000000000008100(slab|head)
[ 1960.794679] raw: 8000000000008100 ffffea001d39e808 ffffea001d39ea08 ffff880778e4b1c0
[ 1960.794739] raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
[ 1960.794785] page dumped because: kasan: bad access detected
[ 1960.794813]
[ 1960.794834] Memory state around the buggy address:
[ 1960.794861] ffff88075accf200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 1960.794894] ffff88075accf280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 1960.794925] >ffff88075accf300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 1960.794956] ^
[ 1960.794985] ffff88075accf380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 1960.795017] ffff88075accf400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 1960.795061] ==================================================================
[ 1960.795106] Disabling lock debugging due to kernel taint
[ 1960.795131] ------------[ cut here ]------------
[ 1960.795148] ida_remove called for id=1802201963 which is not allocated.
[ 1960.795193] WARNING: CPU: 7 PID: 11185 at lib/idr.c:521 ida_remove+0x184/0x210
[ 1960.795213] Modules linked in: nouveau(O) mxm_wmi ttm i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm joydev vfat fat intel_rapl x86_pkg_temp_thermal coretemp crc32_pclmul iTCO_wdt psmouse wmi_bmof mei_me tpm_tis mei tpm_tis_core tpm i2c_i801 thinkpad_acpi pcc_cpufreq crc32c_intel serio_raw xhci_pci xhci_hcd wmi video i2c_dev i2c_core
[ 1960.795305] CPU: 7 PID: 11185 Comm: zsh Kdump: loaded Tainted: G B O 4.18.0Lyude-Test+ #4
[ 1960.795330] Hardware name: LENOVO 20EQS64N0B/20EQS64N0B, BIOS N1EET79W (1.52 ) 07/13/2018
[ 1960.795352] RIP: 0010:ida_remove+0x184/0x210
[ 1960.795370] Code: 4c 89 f7 e8 ae c8 00 00 eb 22 41 83 c4 02 4c 89 e8 41 83 fc 3f 0f 86 64 ff ff ff 44 89 fe 48 c7 c7 20 94 1e 83 e8 54 ed 81 fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 48 01 c3 c7 03 00 00 00 00 c7
[ 1960.795402] RSP: 0018:ffff88074d4df7b8 EFLAGS: 00010082
[ 1960.795421] RAX: 0000000000000000 RBX: 1ffff100e9a9befa RCX: ffffffff81479975
[ 1960.795440] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88077c1de690
[ 1960.795460] RBP: ffff88074d4df878 R08: ffffed00ef83bcd3 R09: ffffed00ef83bcd2
[ 1960.795479] R10: ffffed00ef83bcd2 R11: ffff88077c1de697 R12: 000000000000036b
[ 1960.795498] R13: 0000000000000202 R14: ffffffffa0aa7fa0 R15: 000000006b6b6b6b
[ 1960.795518] FS: 00007f59e0995b80(0000) GS:ffff88077c1c0000(0000) knlGS:0000000000000000
[ 1960.795553] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1960.795571] CR2: 00007f59e09a2010 CR3: 00000004a1a70005 CR4: 00000000003606e0
[ 1960.795596] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1960.795629] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1960.795649] Call Trace:
[ 1960.795667] ? ida_destroy+0x1d0/0x1d0
[ 1960.795686] ? kasan_check_write+0x14/0x20
[ 1960.795704] ? do_raw_spin_lock+0xc2/0x1c0
[ 1960.795724] ida_simple_remove+0x26/0x40
[ 1960.795794] nouveau_backlight_exit+0x9d/0x150 [nouveau]
[ 1960.795867] nouveau_display_destroy+0x76/0x150 [nouveau]
[ 1960.795930] nouveau_drm_device_fini+0xb7/0x190 [nouveau]
[ 1960.795989] nouveau_drm_device_remove+0x14b/0x1d0 [nouveau]
[ 1960.796047] ? nouveau_cli_work_queue+0x2e0/0x2e0 [nouveau]
[ 1960.796067] ? trace_hardirqs_on_caller+0x38b/0x570
[ 1960.796089] ? trace_hardirqs_on+0xd/0x10
[ 1960.796146] nouveau_drm_remove+0x37/0x50 [nouveau]
[ 1960.796167] pci_device_remove+0x112/0x2d0
[ 1960.796186] ? pcibios_free_irq+0x10/0x10
[ 1960.796218] ? kasan_check_write+0x14/0x20
[ 1960.796237] device_release_driver_internal+0x35c/0x650
[ 1960.796257] device_release_driver+0x12/0x20
[ 1960.796289] pci_stop_bus_device+0x172/0x1e0
[ 1960.796308] pci_stop_and_remove_bus_device_locked+0x1a/0x30
[ 1960.796328] remove_store+0xcb/0xe0
[ 1960.796345] ? sriov_numvfs_store+0x2e0/0x2e0
[ 1960.796364] ? __lock_is_held+0xb5/0x140
[ 1960.796383] ? component_add+0x530/0x530
[ 1960.796401] dev_attr_store+0x3f/0x70
[ 1960.796419] ? sysfs_file_ops+0x11d/0x170
[ 1960.796436] sysfs_kf_write+0x104/0x150
[ 1960.796454] ? sysfs_file_ops+0x170/0x170
[ 1960.796471] kernfs_fop_write+0x24f/0x400
[ 1960.796488] ? __lock_acquire+0x6ea/0x47f0
[ 1960.796520] __vfs_write+0xeb/0x760
[ 1960.796538] ? kernel_read+0x130/0x130
[ 1960.796556] ? __lock_is_held+0xb5/0x140
[ 1960.796590] ? rcu_read_lock_sched_held+0xdd/0x110
[ 1960.796608] ? rcu_sync_lockdep_assert+0x78/0xb0
[ 1960.796626] ? __sb_start_write+0x183/0x220
[ 1960.796648] vfs_write+0x14d/0x4a0
[ 1960.796666] ksys_write+0xd2/0x1b0
[ 1960.796684] ? __ia32_sys_read+0xb0/0xb0
[ 1960.796701] ? fput+0x1d/0x120
[ 1960.796732] ? filp_close+0xf3/0x130
[ 1960.796749] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[ 1960.796768] __x64_sys_write+0x73/0xb0
[ 1960.796800] do_syscall_64+0xaa/0x400
[ 1960.796818] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 1960.796836] RIP: 0033:0x7f59df433164
[ 1960.796854] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 8d 05 81 38 2d 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 49 89 d4 55 48 89 f5 53
[ 1960.796884] RSP: 002b:00007ffd70ee2fb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 1960.796906] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f59df433164
[ 1960.796926] RDX: 0000000000000002 RSI: 00005578088640c0 RDI: 0000000000000001
[ 1960.796946] RBP: 00005578088640c0 R08: 00007f59df7038c0 R09: 00007f59e0995b80
[ 1960.796966] R10: 000000000000000a R11: 0000000000000246 R12: 00007f59df702760
[ 1960.796985] R13: 0000000000000002 R14: 00007f59df6fd760 R15: 0000000000000002
[ 1960.797008] irq event stamp: 509990
[ 1960.797026] hardirqs last enabled at (509989): [<ffffffff8119ff78>] flush_work+0x4b8/0x6d0
[ 1960.797063] hardirqs last disabled at (509990): [<ffffffff8297c395>] _raw_spin_lock_irqsave+0x25/0x60
[ 1960.797085] softirqs last enabled at (509744): [<ffffffff82c005ad>] __do_softirq+0x5ad/0x8c0
[ 1960.797121] softirqs last disabled at (509735): [<ffffffff8115aa15>] irq_exit+0x1a5/0x1e0
[ 1960.797142] ---[ end trace fb1342325f1846b8 ]---
While I haven't actually gone into the details of what's causing this to
happen (maybe the kernel removes the backlight device in the device core
before we get to it?), it doesn't really matter anyway because the way
nouveau handles backlights has long since been deprecated.
According to the documentation on the drm_connector->late_register()
hook, the ->late_register() hook should be used for adding extra
connector-related devices. Vice versa, the ->early_unregister() hook is
meant to be used for removing those devices.
So: gut nouveau_drm->bl_list and nouveau_drm->backlight, and replace
them with per-connector backlight structures. Additionally, move
backlight registration/teardown into the ->late_register() and
->early_unregister() hooks so that DRM can give us a chance to remove
the backlight before the connector is even removed. This appears to fix
the problem once and for all.
Changes since v2:
- Use NV_INFO_ONCE for printing GMUX information, since otherwise this
will end up printing that message for as many times as we have
connectors
Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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Currently, there's nothing in nouveau that actually cancels this work
struct. So, cancel it on suspend/unload. Otherwise, if we're unlucky
enough hpd_work might try to keep running up until the system is
suspended.
Signed-off-by: Lyude Paul <lyude@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
|
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On most systems with ACPI hotplugging support, it seems that we always
receive a hotplug event once we re-enable EC interrupts even if the GPU
hasn't even been resumed yet.
This can cause problems since even though we schedule hpd_work to handle
connector reprobing for us, hpd_work synchronizes on
pm_runtime_get_sync() to wait until the device is ready to perform
reprobing. Since runtime suspend/resume callbacks are disabled before
the PM core calls ->suspend(), any calls to pm_runtime_get_sync() during
this period will grab a runtime PM ref and return immediately with
-EACCES. Because we schedule hpd_work from our ACPI HPD handler, and
hpd_work synchronizes on pm_runtime_get_sync(), this causes us to launch
a connector reprobe immediately even if the GPU isn't actually resumed
just yet. This causes various warnings in dmesg and occasionally, also
prevents some displays connected to the dedicated GPU from coming back
up after suspend. Example:
usb 1-4: USB disconnect, device number 14
usb 1-4.1: USB disconnect, device number 15
WARNING: CPU: 0 PID: 838 at drivers/gpu/drm/nouveau/include/nvkm/subdev/i2c.h:170 nouveau_dp_detect+0x17e/0x370 [nouveau]
CPU: 0 PID: 838 Comm: kworker/0:6 Not tainted 4.17.14-201.Lyude.bz1477182.V3.fc28.x86_64 #1
Hardware name: LENOVO 20EQS64N00/20EQS64N00, BIOS N1EET77W (1.50 ) 03/28/2018
Workqueue: events nouveau_display_hpd_work [nouveau]
RIP: 0010:nouveau_dp_detect+0x17e/0x370 [nouveau]
RSP: 0018:ffffa15143933cf0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8cb4f656c400 RCX: 0000000000000000
RDX: ffffa1514500e4e4 RSI: ffffa1514500e4e4 RDI: 0000000001009002
RBP: ffff8cb4f4a8a800 R08: ffffa15143933cfd R09: ffffa15143933cfc
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8cb4fb57a000
R13: ffff8cb4fb57a000 R14: ffff8cb4f4a8f800 R15: ffff8cb4f656c418
FS: 0000000000000000(0000) GS:ffff8cb51f400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f78ec938000 CR3: 000000073720a003 CR4: 00000000003606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
? _cond_resched+0x15/0x30
nouveau_connector_detect+0x2ce/0x520 [nouveau]
? _cond_resched+0x15/0x30
? ww_mutex_lock+0x12/0x40
drm_helper_probe_detect_ctx+0x8b/0xe0 [drm_kms_helper]
drm_helper_hpd_irq_event+0xa8/0x120 [drm_kms_helper]
nouveau_display_hpd_work+0x2a/0x60 [nouveau]
process_one_work+0x187/0x340
worker_thread+0x2e/0x380
? pwq_unbound_release_workfn+0xd0/0xd0
kthread+0x112/0x130
? kthread_create_worker_on_cpu+0x70/0x70
ret_from_fork+0x35/0x40
Code: 4c 8d 44 24 0d b9 00 05 00 00 48 89 ef ba 09 00 00 00 be 01 00 00 00 e8 e1 09 f8 ff 85 c0 0f 85 b2 01 00 00 80 7c 24 0c 03 74 02 <0f> 0b 48 89 ef e8 b8 07 f8 ff f6 05 51 1b c8 ff 02 0f 84 72 ff
---[ end trace 55d811b38fc8e71a ]---
So, to fix this we attempt to grab a runtime PM reference in the ACPI
handler itself asynchronously. If the GPU is already awake (it will have
normal hotplugging at this point) or runtime PM callbacks are currently
disabled on the device, we drop our reference without updating the
autosuspend delay. We only schedule connector reprobes when we
successfully managed to queue up a resume request with our asynchronous
PM ref.
This also has the added benefit of preventing redundant connector
reprobes from ACPI while the GPU is runtime resumed!
Signed-off-by: Lyude Paul <lyude@redhat.com>
Cc: stable@vger.kernel.org
Cc: Karol Herbst <kherbst@redhat.com>
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1477182#c41
Signed-off-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
|
|
Currently, nouveau uses the generic drm_fb_helper_output_poll_changed()
function provided by DRM as it's output_poll_changed callback.
Unfortunately however, this function doesn't grab runtime PM references
early enough and even if it did-we can't block waiting for the device to
resume in output_poll_changed() since it's very likely that we'll need
to grab the fb_helper lock at some point during the runtime resume
process. This currently results in deadlocking like so:
[ 246.669625] INFO: task kworker/4:0:37 blocked for more than 120 seconds.
[ 246.673398] Not tainted 4.18.0-rc5Lyude-Test+ #2
[ 246.675271] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 246.676527] kworker/4:0 D 0 37 2 0x80000000
[ 246.677580] Workqueue: events output_poll_execute [drm_kms_helper]
[ 246.678704] Call Trace:
[ 246.679753] __schedule+0x322/0xaf0
[ 246.680916] schedule+0x33/0x90
[ 246.681924] schedule_preempt_disabled+0x15/0x20
[ 246.683023] __mutex_lock+0x569/0x9a0
[ 246.684035] ? kobject_uevent_env+0x117/0x7b0
[ 246.685132] ? drm_fb_helper_hotplug_event.part.28+0x20/0xb0 [drm_kms_helper]
[ 246.686179] mutex_lock_nested+0x1b/0x20
[ 246.687278] ? mutex_lock_nested+0x1b/0x20
[ 246.688307] drm_fb_helper_hotplug_event.part.28+0x20/0xb0 [drm_kms_helper]
[ 246.689420] drm_fb_helper_output_poll_changed+0x23/0x30 [drm_kms_helper]
[ 246.690462] drm_kms_helper_hotplug_event+0x2a/0x30 [drm_kms_helper]
[ 246.691570] output_poll_execute+0x198/0x1c0 [drm_kms_helper]
[ 246.692611] process_one_work+0x231/0x620
[ 246.693725] worker_thread+0x214/0x3a0
[ 246.694756] kthread+0x12b/0x150
[ 246.695856] ? wq_pool_ids_show+0x140/0x140
[ 246.696888] ? kthread_create_worker_on_cpu+0x70/0x70
[ 246.697998] ret_from_fork+0x3a/0x50
[ 246.699034] INFO: task kworker/0:1:60 blocked for more than 120 seconds.
[ 246.700153] Not tainted 4.18.0-rc5Lyude-Test+ #2
[ 246.701182] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 246.702278] kworker/0:1 D 0 60 2 0x80000000
[ 246.703293] Workqueue: pm pm_runtime_work
[ 246.704393] Call Trace:
[ 246.705403] __schedule+0x322/0xaf0
[ 246.706439] ? wait_for_completion+0x104/0x190
[ 246.707393] schedule+0x33/0x90
[ 246.708375] schedule_timeout+0x3a5/0x590
[ 246.709289] ? mark_held_locks+0x58/0x80
[ 246.710208] ? _raw_spin_unlock_irq+0x2c/0x40
[ 246.711222] ? wait_for_completion+0x104/0x190
[ 246.712134] ? trace_hardirqs_on_caller+0xf4/0x190
[ 246.713094] ? wait_for_completion+0x104/0x190
[ 246.713964] wait_for_completion+0x12c/0x190
[ 246.714895] ? wake_up_q+0x80/0x80
[ 246.715727] ? get_work_pool+0x90/0x90
[ 246.716649] flush_work+0x1c9/0x280
[ 246.717483] ? flush_workqueue_prep_pwqs+0x1b0/0x1b0
[ 246.718442] __cancel_work_timer+0x146/0x1d0
[ 246.719247] cancel_delayed_work_sync+0x13/0x20
[ 246.720043] drm_kms_helper_poll_disable+0x1f/0x30 [drm_kms_helper]
[ 246.721123] nouveau_pmops_runtime_suspend+0x3d/0xb0 [nouveau]
[ 246.721897] pci_pm_runtime_suspend+0x6b/0x190
[ 246.722825] ? pci_has_legacy_pm_support+0x70/0x70
[ 246.723737] __rpm_callback+0x7a/0x1d0
[ 246.724721] ? pci_has_legacy_pm_support+0x70/0x70
[ 246.725607] rpm_callback+0x24/0x80
[ 246.726553] ? pci_has_legacy_pm_support+0x70/0x70
[ 246.727376] rpm_suspend+0x142/0x6b0
[ 246.728185] pm_runtime_work+0x97/0xc0
[ 246.728938] process_one_work+0x231/0x620
[ 246.729796] worker_thread+0x44/0x3a0
[ 246.730614] kthread+0x12b/0x150
[ 246.731395] ? wq_pool_ids_show+0x140/0x140
[ 246.732202] ? kthread_create_worker_on_cpu+0x70/0x70
[ 246.732878] ret_from_fork+0x3a/0x50
[ 246.733768] INFO: task kworker/4:2:422 blocked for more than 120 seconds.
[ 246.734587] Not tainted 4.18.0-rc5Lyude-Test+ #2
[ 246.735393] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 246.736113] kworker/4:2 D 0 422 2 0x80000080
[ 246.736789] Workqueue: events_long drm_dp_mst_link_probe_work [drm_kms_helper]
[ 246.737665] Call Trace:
[ 246.738490] __schedule+0x322/0xaf0
[ 246.739250] schedule+0x33/0x90
[ 246.739908] rpm_resume+0x19c/0x850
[ 246.740750] ? finish_wait+0x90/0x90
[ 246.741541] __pm_runtime_resume+0x4e/0x90
[ 246.742370] nv50_disp_atomic_commit+0x31/0x210 [nouveau]
[ 246.743124] drm_atomic_commit+0x4a/0x50 [drm]
[ 246.743775] restore_fbdev_mode_atomic+0x1c8/0x240 [drm_kms_helper]
[ 246.744603] restore_fbdev_mode+0x31/0x140 [drm_kms_helper]
[ 246.745373] drm_fb_helper_restore_fbdev_mode_unlocked+0x54/0xb0 [drm_kms_helper]
[ 246.746220] drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper]
[ 246.746884] drm_fb_helper_hotplug_event.part.28+0x96/0xb0 [drm_kms_helper]
[ 246.747675] drm_fb_helper_output_poll_changed+0x23/0x30 [drm_kms_helper]
[ 246.748544] drm_kms_helper_hotplug_event+0x2a/0x30 [drm_kms_helper]
[ 246.749439] nv50_mstm_hotplug+0x15/0x20 [nouveau]
[ 246.750111] drm_dp_send_link_address+0x177/0x1c0 [drm_kms_helper]
[ 246.750764] drm_dp_check_and_send_link_address+0xa8/0xd0 [drm_kms_helper]
[ 246.751602] drm_dp_mst_link_probe_work+0x51/0x90 [drm_kms_helper]
[ 246.752314] process_one_work+0x231/0x620
[ 246.752979] worker_thread+0x44/0x3a0
[ 246.753838] kthread+0x12b/0x150
[ 246.754619] ? wq_pool_ids_show+0x140/0x140
[ 246.755386] ? kthread_create_worker_on_cpu+0x70/0x70
[ 246.756162] ret_from_fork+0x3a/0x50
[ 246.756847]
Showing all locks held in the system:
[ 246.758261] 3 locks held by kworker/4:0/37:
[ 246.759016] #0: 00000000f8df4d2d ((wq_completion)"events"){+.+.}, at: process_one_work+0x1b3/0x620
[ 246.759856] #1: 00000000e6065461 ((work_completion)(&(&dev->mode_config.output_poll_work)->work)){+.+.}, at: process_one_work+0x1b3/0x620
[ 246.760670] #2: 00000000cb66735f (&helper->lock){+.+.}, at: drm_fb_helper_hotplug_event.part.28+0x20/0xb0 [drm_kms_helper]
[ 246.761516] 2 locks held by kworker/0:1/60:
[ 246.762274] #0: 00000000fff6be0f ((wq_completion)"pm"){+.+.}, at: process_one_work+0x1b3/0x620
[ 246.762982] #1: 000000005ab44fb4 ((work_completion)(&dev->power.work)){+.+.}, at: process_one_work+0x1b3/0x620
[ 246.763890] 1 lock held by khungtaskd/64:
[ 246.764664] #0: 000000008cb8b5c3 (rcu_read_lock){....}, at: debug_show_all_locks+0x23/0x185
[ 246.765588] 5 locks held by kworker/4:2/422:
[ 246.766440] #0: 00000000232f0959 ((wq_completion)"events_long"){+.+.}, at: process_one_work+0x1b3/0x620
[ 246.767390] #1: 00000000bb59b134 ((work_completion)(&mgr->work)){+.+.}, at: process_one_work+0x1b3/0x620
[ 246.768154] #2: 00000000cb66735f (&helper->lock){+.+.}, at: drm_fb_helper_restore_fbdev_mode_unlocked+0x4c/0xb0 [drm_kms_helper]
[ 246.768966] #3: 000000004c8f0b6b (crtc_ww_class_acquire){+.+.}, at: restore_fbdev_mode_atomic+0x4b/0x240 [drm_kms_helper]
[ 246.769921] #4: 000000004c34a296 (crtc_ww_class_mutex){+.+.}, at: drm_modeset_backoff+0x8a/0x1b0 [drm]
[ 246.770839] 1 lock held by dmesg/1038:
[ 246.771739] 2 locks held by zsh/1172:
[ 246.772650] #0: 00000000836d0438 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40
[ 246.773680] #1: 000000001f4f4d48 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0xc1/0x870
[ 246.775522] =============================================
After trying dozens of different solutions, I found one very simple one
that should also have the benefit of preventing us from having to fight
locking for the rest of our lives. So, we work around these deadlocks by
deferring all fbcon hotplug events that happen after the runtime suspend
process starts until after the device is resumed again.
Changes since v7:
- Fixup commit message - Daniel Vetter
Changes since v6:
- Remove unused nouveau_fbcon_hotplugged_in_suspend() - Ilia
Changes since v5:
- Come up with the (hopefully final) solution for solving this dumb
problem, one that is a lot less likely to cause issues with locking in
the future. This should work around all deadlock conditions with fbcon
brought up thus far.
Changes since v4:
- Add nouveau_fbcon_hotplugged_in_suspend() to workaround deadlock
condition that Lukas described
- Just move all of this out of drm_fb_helper. It seems that other DRM
drivers have already figured out other workarounds for this. If other
drivers do end up needing this in the future, we can just move this
back into drm_fb_helper again.
Changes since v3:
- Actually check if fb_helper is NULL in both new helpers
- Actually check drm_fbdev_emulation in both new helpers
- Don't fire off a fb_helper hotplug unconditionally; only do it if
the following conditions are true (as otherwise, calling this in the
wrong spot will cause Bad Things to happen):
- fb_helper hotplug handling was actually inhibited previously
- fb_helper actually has a delayed hotplug pending
- fb_helper is actually bound
- fb_helper is actually initialized
- Add __must_check to drm_fb_helper_suspend_hotplug(). There's no
situation where a driver would actually want to use this without
checking the return value, so enforce that
- Rewrite and clarify the documentation for both helpers.
- Make sure to return true in the drm_fb_helper_suspend_hotplug() stub
that's provided in drm_fb_helper.h when CONFIG_DRM_FBDEV_EMULATION
isn't enabled
- Actually grab the toplevel fb_helper lock in
drm_fb_helper_resume_hotplug(), since it's possible other activity
(such as a hotplug) could be going on at the same time the driver
calls drm_fb_helper_resume_hotplug(). We need this to check whether or
not drm_fb_helper_hotplug_event() needs to be called anyway
Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Cc: stable@vger.kernel.org
Cc: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
|
|
Turns out this part is my fault for not noticing when reviewing
9a2eba337cace ("drm/nouveau: Fix drm poll_helper handling"). Currently
we call drm_kms_helper_poll_enable() from nouveau_display_hpd_work().
This makes basically no sense however, because that means we're calling
drm_kms_helper_poll_enable() every time we schedule the hotplug
detection work. This is also against the advice mentioned in
drm_kms_helper_poll_enable()'s documentation:
Note that calls to enable and disable polling must be strictly ordered,
which is automatically the case when they're only call from
suspend/resume callbacks.
Of course, hotplugs can't really be ordered. They could even happen
immediately after we called drm_kms_helper_poll_disable() in
nouveau_display_fini(), which can lead to all sorts of issues.
Additionally; enabling polling /after/ we call
drm_helper_hpd_irq_event() could also mean that we'd miss a hotplug
event anyway, since drm_helper_hpd_irq_event() wouldn't bother trying to
probe connectors so long as polling is disabled.
So; simply move this back into nouveau_display_init() again. The race
condition that both of these patches attempted to work around has
already been fixed properly in
d61a5c106351 ("drm/nouveau: Fix deadlock on runtime suspend")
Fixes: 9a2eba337cace ("drm/nouveau: Fix drm poll_helper handling")
Signed-off-by: Lyude Paul <lyude@redhat.com>
Acked-by: Karol Herbst <kherbst@redhat.com>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
|
|
rmk requested this for armada and I think we've had a few
conflicts build up.
Signed-off-by: Dave Airlie <airlied@redhat.com>
|
|
This patch unifies the naming of DRM functions for reference counting
of struct drm_gem_object. The resulting code is more aligned with the
rest of the Linux kernel interfaces.
Signed-off-by: Thomas Zimmermann <tdz@users.sourceforge.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
|
|
When MST and atomic were introduced to nouveau, another structure that
could contain a drm_connector embedded within it was introduced; struct
nv50_mstc. This meant that we no longer would be able to simply loop
through our connector list and assume that nouveau_connector() would
return a proper pointer for each connector, since the assertion that
all connectors coming from nouveau have a full nouveau_connector struct
became invalid.
Unfortunately, none of the actual code that looped through connectors
ever got updated, which means that we've been causing invalid memory
accesses for quite a while now.
An example that was caught by KASAN:
[ 201.038698] ==================================================================
[ 201.038792] BUG: KASAN: slab-out-of-bounds in nvif_notify_get+0x190/0x1a0 [nouveau]
[ 201.038797] Read of size 4 at addr ffff88076738c650 by task kworker/0:3/718
[ 201.038800]
[ 201.038822] CPU: 0 PID: 718 Comm: kworker/0:3 Tainted: G O 4.18.0-rc4Lyude-Test+ #1
[ 201.038825] Hardware name: LENOVO 20EQS64N0B/20EQS64N0B, BIOS N1EET78W (1.51 ) 05/18/2018
[ 201.038882] Workqueue: events nouveau_display_hpd_work [nouveau]
[ 201.038887] Call Trace:
[ 201.038894] dump_stack+0xa4/0xfd
[ 201.038900] print_address_description+0x71/0x239
[ 201.038929] ? nvif_notify_get+0x190/0x1a0 [nouveau]
[ 201.038935] kasan_report.cold.6+0x242/0x2fe
[ 201.038942] __asan_report_load4_noabort+0x19/0x20
[ 201.038970] nvif_notify_get+0x190/0x1a0 [nouveau]
[ 201.038998] ? nvif_notify_put+0x1f0/0x1f0 [nouveau]
[ 201.039003] ? kmsg_dump_rewind_nolock+0xe4/0xe4
[ 201.039049] nouveau_display_init.cold.12+0x34/0x39 [nouveau]
[ 201.039089] ? nouveau_user_framebuffer_create+0x120/0x120 [nouveau]
[ 201.039133] nouveau_display_resume+0x5c0/0x810 [nouveau]
[ 201.039173] ? nvkm_client_ioctl+0x20/0x20 [nouveau]
[ 201.039215] nouveau_do_resume+0x19f/0x570 [nouveau]
[ 201.039256] nouveau_pmops_runtime_resume+0xd8/0x2a0 [nouveau]
[ 201.039264] pci_pm_runtime_resume+0x130/0x250
[ 201.039269] ? pci_restore_standard_config+0x70/0x70
[ 201.039275] __rpm_callback+0x1f2/0x5d0
[ 201.039279] ? rpm_resume+0x560/0x18a0
[ 201.039283] ? pci_restore_standard_config+0x70/0x70
[ 201.039287] ? pci_restore_standard_config+0x70/0x70
[ 201.039291] ? pci_restore_standard_config+0x70/0x70
[ 201.039296] rpm_callback+0x175/0x210
[ 201.039300] ? pci_restore_standard_config+0x70/0x70
[ 201.039305] rpm_resume+0xcc3/0x18a0
[ 201.039312] ? rpm_callback+0x210/0x210
[ 201.039317] ? __pm_runtime_resume+0x9e/0x100
[ 201.039322] ? kasan_check_write+0x14/0x20
[ 201.039326] ? do_raw_spin_lock+0xc2/0x1c0
[ 201.039333] __pm_runtime_resume+0xac/0x100
[ 201.039374] nouveau_display_hpd_work+0x67/0x1f0 [nouveau]
[ 201.039380] process_one_work+0x7a0/0x14d0
[ 201.039388] ? cancel_delayed_work_sync+0x20/0x20
[ 201.039392] ? lock_acquire+0x113/0x310
[ 201.039398] ? kasan_check_write+0x14/0x20
[ 201.039402] ? do_raw_spin_lock+0xc2/0x1c0
[ 201.039409] worker_thread+0x86/0xb50
[ 201.039418] kthread+0x2e9/0x3a0
[ 201.039422] ? process_one_work+0x14d0/0x14d0
[ 201.039426] ? kthread_create_worker_on_cpu+0xc0/0xc0
[ 201.039431] ret_from_fork+0x3a/0x50
[ 201.039441]
[ 201.039444] Allocated by task 79:
[ 201.039449] save_stack+0x43/0xd0
[ 201.039452] kasan_kmalloc+0xc4/0xe0
[ 201.039456] kmem_cache_alloc_trace+0x10a/0x260
[ 201.039494] nv50_mstm_add_connector+0x9a/0x340 [nouveau]
[ 201.039504] drm_dp_add_port+0xff5/0x1fc0 [drm_kms_helper]
[ 201.039511] drm_dp_send_link_address+0x4a7/0x740 [drm_kms_helper]
[ 201.039518] drm_dp_check_and_send_link_address+0x1a7/0x210 [drm_kms_helper]
[ 201.039525] drm_dp_mst_link_probe_work+0x71/0xb0 [drm_kms_helper]
[ 201.039529] process_one_work+0x7a0/0x14d0
[ 201.039533] worker_thread+0x86/0xb50
[ 201.039537] kthread+0x2e9/0x3a0
[ 201.039541] ret_from_fork+0x3a/0x50
[ 201.039543]
[ 201.039546] Freed by task 0:
[ 201.039549] (stack is not available)
[ 201.039551]
[ 201.039555] The buggy address belongs to the object at ffff88076738c1a8
which belongs to the cache kmalloc-2048 of size 2048
[ 201.039559] The buggy address is located 1192 bytes inside of
2048-byte region [ffff88076738c1a8, ffff88076738c9a8)
[ 201.039563] The buggy address belongs to the page:
[ 201.039567] page:ffffea001d9ce200 count:1 mapcount:0 mapping:ffff88084000d0c0 index:0x0 compound_mapcount: 0
[ 201.039573] flags: 0x8000000000008100(slab|head)
[ 201.039578] raw: 8000000000008100 ffffea001da3be08 ffffea001da25a08 ffff88084000d0c0
[ 201.039582] raw: 0000000000000000 00000000000d000d 00000001ffffffff 0000000000000000
[ 201.039585] page dumped because: kasan: bad access detected
[ 201.039588]
[ 201.039591] Memory state around the buggy address:
[ 201.039594] ffff88076738c500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 201.039598] ffff88076738c580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 201.039601] >ffff88076738c600: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
[ 201.039604] ^
[ 201.039607] ffff88076738c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 201.039611] ffff88076738c700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 201.039613] ==================================================================
Signed-off-by: Lyude Paul <lyude@redhat.com>
Cc: stable@vger.kernel.org
Cc: Karol Herbst <karolherbst@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
|
|
Every codepath in nouveau that loops through the connector list
currently does so using the old method, which is prone to race
conditions from MST connectors being created and destroyed. This has
been causing a multitude of problems, including memory corruption from
trying to access connectors that have already been freed!
Signed-off-by: Lyude Paul <lyude@redhat.com>
Cc: stable@vger.kernel.org
Cc: Karol Herbst <karolherbst@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
|
|
This function is useful outside of DRM code.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
|
|
drm_property_add_enum() can calculate the index itself just fine,
so no point in having the caller pass it in.
Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: nouveau@lists.freedesktop.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180316190420.26734-1-ville.syrjala@linux.intel.com
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
|
|
This driver can use drm_fb_helper_output_poll_changed() instead of
its own nouveau_fbcon_output_poll_changed().
Cc: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20171205182504.41923-8-noralf@tronnes.org
|
|
Pre-nv50 YUV overlays have stringent requirements for working with the
internal machinery. Instead of rejecting these at update_plane time, we
should instead prevent the framebuffers from being created in the first
place.
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
|
|
Linux 4.13-rc5
There's a really nasty nouveau collision, hopefully someone can take a look
once I pushed this out.
|
|
These on()/off() calls should be done as a result of modesetting actions,
and as we shut down all heads already on unload/suspend, it's pointless
to call off() again.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
|
|
Required for Daniel's drm_vblank_cleanup cleanup
|
|
nouveau_display_vblank_fini is called in the load error path (where it
doesn't matter) and module unload (where vblanks have been shut down
correctly already through drm_vblank_off), we can drop it.
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: nouveau@lists.freedesktop.org
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170621082850.13224-8-daniel.vetter@ffwll.ch
|
|
Linux 4.12-rc3
Daniel has requested this for some drm-intel-next work.
|
|
Commit cae9ff036eea effectively disabled the drm poll_helper by checking
the wrong flag to see if the driver should enable the poll or not:
mode_config.poll_enabled is only set to true by poll_init and it is not
indicating if the poll is enabled or not.
nouveau_display_create() will initialize the poll and going to disable it
right away. After poll_init() the mode_config.poll_enabled will be true,
but the poll itself is disabled.
To avoid the race caused by calling the poll_enable() from different paths,
this patch will enable the poll from one place, in the
nouveau_display_hpd_work().
In case the pm_runtime is disabled we will enable the poll in
nouveau_drm_load() once.
Fixes: cae9ff036eea ("drm/nouveau: Don't enabling polling twice on runtime resume")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: Lyude <lyude@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
|
|
If we restrict this helper to only kms drivers (which is the case) we
can look up the correct mode easily ourselves. But it's a bit tricky:
- All legacy drivers look at crtc->hwmode. But that is updated already
at the beginning of the modeset helper, which means when we disable
a pipe. Hence the final timestamps might be a bit off. But since
this is an existing bug I'm not going to change it, but just try to
be bug-for-bug compatible with the current code. This only applies
to radeon&amdgpu.
- i915 tries to get it perfect by updating crtc->hwmode when the pipe
is off (i.e. vblank->enabled = false).
- All other atomic drivers look at crtc->state->adjusted_mode. Those
that look at state->requested_mode simply don't adjust their mode,
so it's the same. That has two problems: Accessing crtc->state from
interrupt handling code is unsafe, and it's updated before we shut
down the pipe. For nonblocking modesets it's even worse.
For atomic drivers try to implement what i915 does. To do that we add
a new hwmode field to the vblank structure, and update it from
drm_calc_timestamping_constants(). For atomic drivers that's called
from the right spot by the helper library already, so all fine. But
for safety let's enforce that.
For legacy driver this function is only called at the end (oh the
fun), which is broken, so again let's not bother and just stay
bug-for-bug compatible.
The benefit is that we can use drm_calc_vbltimestamp_from_scanoutpos
directly to implement ->get_vblank_timestamp in every driver, deleting
a lot of code.
v2: Completely new approach, trying to mimick the i915 solution.
v3: Fixup kerneldoc.
v4: Drop the WARN_ON to check that the vblank is off, atomic helpers
currently unconditionally call this. Recomputing the same stuff should
be harmless.
v5: Fix typos and move misplaced hunks to the right patches (Neil).
v6: Undo hunk movement (kbuild).
Cc: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Cc: Eric Anholt <eric@anholt.net>
Cc: Rob Clark <robdclark@gmail.com>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170509140329.24114-4-daniel.vetter@ffwll.ch
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It's overkill to have a flag parameter which is essentially used just
as a boolean. This takes care of core + adjusting drivers.
Adjusting the scanout position callback is a bit harder, since radeon
also supplies it's own driver-private flags in there.
v2: Fixup misplaced hunks (Neil).
v3: kbuild says v1 was better ...
Cc: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Cc: Eric Anholt <eric@anholt.net>
Cc: Rob Clark <robdclark@gmail.com>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170509140329.24114-2-daniel.vetter@ffwll.ch
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There's really no reason for anything more:
- Calling this while the crtc vblank stuff isn't set up is a driver
bug. Those places alrready DRM_ERROR.
- Calling this when the crtc is off is either a driver bug (calling
drm_crtc_handle_vblank at the wrong time) or a core bug (for
anything else). Again, we DRM_ERROR.
- EINVAL is checked at higher levels already, and if we'd use struct
drm_crtc * instead of (dev, pipe) it would be real obvious that
those are again core bugs.
The only valid failure mode is crap hardware that couldn't sample a
useful timestamp, to ask the core to just grab a not-so-accurate
timestamp. Bool is perfectly fine for that.
v2: Also fix up the one caller, I lost that in the shuffling (Jani).
v3: Fixup commit message (Neil).
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Cc: Eric Anholt <eric@anholt.net>
Cc: Rob Clark <robdclark@gmail.com>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170509140329.24114-1-daniel.vetter@ffwll.ch
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So far we only allowed for 1 retry and just failed the query
- and thereby high precision vblank timestamping - if we did
not get a reasonable result, as such a failure wasn't considered
all too horrible. There are a few NVidia gpu models out there which
may need a bit more than 1 retry to get a successful query result
under some conditions.
Since Linux 4.4 the update code for vblank counter and timestamp
in drm_update_vblank_count() changed so that the implementation
assumes that high precision vblank timestamping of a kms driver
either consistently succeeds or consistently fails for a given
video mode and encoder/connector combo. Iow. switching from success
to fail or vice versa on a modeset or connector change is ok, but
spurious temporary failure for a given setup can confuse the core
code and potentially cause bad miscounting of vblanks and confusion
or hangs in userspace clients which rely on vblank stuff, e.g.,
desktop compositors.
Therefore change the max retry count to a larger number - more than
any gpu so far is known to need to succeed, but still low enough
so that these queries which do also happen in vblank interrupt are
still fast enough to be not disastrously long if something would
go badly wrong with them.
As such sporadic retries only happen seldom even on affected gpu's,
this could mean a vblank irq could take a few dozen microseconds
longer every few hours of uptime -- better than a desktop compositor
randomly hanging every couple of hours or days of uptime in a hard
to reproduce manner.
Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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Again just going through the motions, no functional changes in here.
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Eric Anholt <eric@anholt.net>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>t
Link: http://patchwork.freedesktop.org/patch/msgid/20170322215058.8671-12-daniel.vetter@ffwll.ch
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The trouble here is that it does multiple atomic commits under one
drm_modeset_lock_all, which breaks the behind-the-scenes acquire
context magic that function pulls off. It's much better to have one
overall atomic commit. That we still have multiple atomic commits
prevents us from adding some pretty useful debug checks to the atomic
machinery.
Hence it is really a bad idea to call the legacy
drm_crtc_force_disable_all() function. There's 2 atomic drivers using
this still, nouveau and tinydrm. To fix this, introduce a new
drm_atomic_helper_shutdown() by extracting the code from i915.
While at it improve kernel-doc and catch future offenders by
sprinkling a WARN_ON into the legacy function. We should probably move
those into the legacy modeset helpers, too ...
v2: Make it compile on arm drivers too (Noralf).
v3: Correct kerneldoc to point at _disable_all().
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Acked-by: Noralf Trønnes <noralf@tronnes.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Noralf Trønnes <noralf@tronnes.org>
Cc: Ben Skeggs <bskeggs@redhat.com>
Tested-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170321164149.31531-1-daniel.vetter@ffwll.ch
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It seems that nouveau requires this, so best to do this in the helper.
This allows nouveau to use the atomic suspend helper.
Cc: nouveau@lists.freedesktop.org
Acked-by: Ben Skeggs <bskeggs@redhat.com> #irc
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1487685102-31991-2-git-send-email-maarten.lankhorst@linux.intel.com
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Lyude Paul
Dave Airlie
James Jones
Ben Skeggs
Thomas Zimmermann
Emil Velikov
Sam Ravnborg
Gerd Hoffmann
Bjorn Helgaas
Daniel Vetter
Thomas Zimmermann
Ville Syrjälä
Noralf Trønnes
Ilia Mirkin
Sean Paul
Peter Ujfalusi
Mario Kleiner
Maarten Lankhorst