bd738d859e
An unexpected modeset or connector detection by a user (user space or FB
console) during the initialization/shutdown sequence is possible either
via a hotplug IRQ handling work or via the connector sysfs
(status/detect) interface. These modesets/detections should be prevented
by disabling/flushing all related hotplug handling work and
unregistering the interfaces that can start them at the beginning of the
shutdown sequence. Some of this - disabling all related intel_hotplug
work - will be done by the next patch, but others - for instance
disabling the MST hotplug works - require a bigger rework.
It makes sense - for diagnostic purpose, even with all the above work and
interface disabled - to detect and reject any such user access. This
patch does that for modeset accesses and a follow-up patch for connector
detection.
During driver loading/unloading/system suspend/shutdown and during
system resume after calling intel_display_driver_disable_user_access()
or intel_display_driver_resume_access() correspondigly, the current
thread is allowed to modeset (as this thread requires to do an
initial/restoring modeset or a disabling modeset), other threads (the
user threads) are not allowed to modeset.
During driver loading/system resume after calling
intel_display_driver_enable_user_access() all threads are allowed to
modeset.
During driver unloading/system suspend/shutdown after calling
intel_display_driver_suspend_access() no threads are allowed to modeset
(as the HW got disabled and should stay in this state).
v2: Call intel_display_driver_suspend_access()/resume_access() only
for HAS_DISPLAY(). (CI)
v3: (Jouni)
- Add commit log comments explaining how the permission of modeset
changes during HW init/deinit wrt. to the current and other user
processes.
Link: https://patchwork.freedesktop.org/patch/msgid/20240104132335.2766434-1-imre.deak@intel.com
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
42 lines
1.7 KiB
C
42 lines
1.7 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright © 2022-2023 Intel Corporation
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*/
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#ifndef __INTEL_DISPLAY_DRIVER_H__
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#define __INTEL_DISPLAY_DRIVER_H__
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#include <linux/types.h>
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struct drm_atomic_state;
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struct drm_i915_private;
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struct drm_modeset_acquire_ctx;
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struct pci_dev;
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bool intel_display_driver_probe_defer(struct pci_dev *pdev);
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void intel_display_driver_init_hw(struct drm_i915_private *i915);
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void intel_display_driver_early_probe(struct drm_i915_private *i915);
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int intel_display_driver_probe_noirq(struct drm_i915_private *i915);
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int intel_display_driver_probe_nogem(struct drm_i915_private *i915);
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int intel_display_driver_probe(struct drm_i915_private *i915);
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void intel_display_driver_register(struct drm_i915_private *i915);
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void intel_display_driver_remove(struct drm_i915_private *i915);
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void intel_display_driver_remove_noirq(struct drm_i915_private *i915);
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void intel_display_driver_remove_nogem(struct drm_i915_private *i915);
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void intel_display_driver_unregister(struct drm_i915_private *i915);
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int intel_display_driver_suspend(struct drm_i915_private *i915);
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void intel_display_driver_resume(struct drm_i915_private *i915);
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/* interface for intel_display_reset.c */
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int __intel_display_driver_resume(struct drm_i915_private *i915,
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struct drm_atomic_state *state,
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struct drm_modeset_acquire_ctx *ctx);
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void intel_display_driver_enable_user_access(struct drm_i915_private *i915);
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void intel_display_driver_disable_user_access(struct drm_i915_private *i915);
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void intel_display_driver_suspend_access(struct drm_i915_private *i915);
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void intel_display_driver_resume_access(struct drm_i915_private *i915);
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bool intel_display_driver_check_access(struct drm_i915_private *i915);
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#endif /* __INTEL_DISPLAY_DRIVER_H__ */
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