214 lines
6.9 KiB
C
214 lines
6.9 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright © 2019 Intel Corporation
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*/
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#ifndef __INTEL_RUNTIME_PM_H__
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#define __INTEL_RUNTIME_PM_H__
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#include <linux/types.h>
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#include "display/intel_display.h"
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#include "intel_wakeref.h"
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#include "i915_utils.h"
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struct device;
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struct drm_i915_private;
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struct drm_printer;
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enum i915_drm_suspend_mode {
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I915_DRM_SUSPEND_IDLE,
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I915_DRM_SUSPEND_MEM,
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I915_DRM_SUSPEND_HIBERNATE,
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};
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/*
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* This struct helps tracking the state needed for runtime PM, which puts the
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* device in PCI D3 state. Notice that when this happens, nothing on the
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* graphics device works, even register access, so we don't get interrupts nor
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* anything else.
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*
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* Every piece of our code that needs to actually touch the hardware needs to
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* either call intel_runtime_pm_get or call intel_display_power_get with the
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* appropriate power domain.
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*
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* Our driver uses the autosuspend delay feature, which means we'll only really
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* suspend if we stay with zero refcount for a certain amount of time. The
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* default value is currently very conservative (see intel_runtime_pm_enable), but
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* it can be changed with the standard runtime PM files from sysfs.
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*
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* The irqs_disabled variable becomes true exactly after we disable the IRQs and
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* goes back to false exactly before we reenable the IRQs. We use this variable
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* to check if someone is trying to enable/disable IRQs while they're supposed
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* to be disabled. This shouldn't happen and we'll print some error messages in
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* case it happens.
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*
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* For more, read the Documentation/power/runtime_pm.txt.
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*/
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struct intel_runtime_pm {
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atomic_t wakeref_count;
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struct device *kdev; /* points to i915->drm.pdev->dev */
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bool available;
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bool suspended;
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bool irqs_enabled;
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#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM)
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/*
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* To aide detection of wakeref leaks and general misuse, we
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* track all wakeref holders. With manual markup (i.e. returning
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* a cookie to each rpm_get caller which they then supply to their
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* paired rpm_put) we can remove corresponding pairs of and keep
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* the array trimmed to active wakerefs.
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*/
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struct intel_runtime_pm_debug {
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spinlock_t lock;
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depot_stack_handle_t last_acquire;
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depot_stack_handle_t last_release;
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depot_stack_handle_t *owners;
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unsigned long count;
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} debug;
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#endif
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};
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#define BITS_PER_WAKEREF \
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BITS_PER_TYPE(struct_member(struct intel_runtime_pm, wakeref_count))
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#define INTEL_RPM_WAKELOCK_SHIFT (BITS_PER_WAKEREF / 2)
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#define INTEL_RPM_WAKELOCK_BIAS (1 << INTEL_RPM_WAKELOCK_SHIFT)
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#define INTEL_RPM_RAW_WAKEREF_MASK (INTEL_RPM_WAKELOCK_BIAS - 1)
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static inline int
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intel_rpm_raw_wakeref_count(int wakeref_count)
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{
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return wakeref_count & INTEL_RPM_RAW_WAKEREF_MASK;
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}
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static inline int
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intel_rpm_wakelock_count(int wakeref_count)
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{
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return wakeref_count >> INTEL_RPM_WAKELOCK_SHIFT;
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}
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static inline void
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assert_rpm_device_not_suspended(struct intel_runtime_pm *rpm)
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{
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WARN_ONCE(rpm->suspended,
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"Device suspended during HW access\n");
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}
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static inline void
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__assert_rpm_raw_wakeref_held(struct intel_runtime_pm *rpm, int wakeref_count)
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{
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assert_rpm_device_not_suspended(rpm);
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WARN_ONCE(!intel_rpm_raw_wakeref_count(wakeref_count),
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"RPM raw-wakeref not held\n");
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}
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static inline void
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__assert_rpm_wakelock_held(struct intel_runtime_pm *rpm, int wakeref_count)
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{
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__assert_rpm_raw_wakeref_held(rpm, wakeref_count);
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WARN_ONCE(!intel_rpm_wakelock_count(wakeref_count),
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"RPM wakelock ref not held during HW access\n");
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}
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static inline void
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assert_rpm_raw_wakeref_held(struct intel_runtime_pm *rpm)
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{
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__assert_rpm_raw_wakeref_held(rpm, atomic_read(&rpm->wakeref_count));
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}
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static inline void
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assert_rpm_wakelock_held(struct intel_runtime_pm *rpm)
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{
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__assert_rpm_wakelock_held(rpm, atomic_read(&rpm->wakeref_count));
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}
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/**
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* disable_rpm_wakeref_asserts - disable the RPM assert checks
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* @rpm: the intel_runtime_pm structure
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*
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* This function disable asserts that check if we hold an RPM wakelock
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* reference, while keeping the device-not-suspended checks still enabled.
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* It's meant to be used only in special circumstances where our rule about
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* the wakelock refcount wrt. the device power state doesn't hold. According
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* to this rule at any point where we access the HW or want to keep the HW in
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* an active state we must hold an RPM wakelock reference acquired via one of
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* the intel_runtime_pm_get() helpers. Currently there are a few special spots
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* where this rule doesn't hold: the IRQ and suspend/resume handlers, the
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* forcewake release timer, and the GPU RPS and hangcheck works. All other
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* users should avoid using this function.
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*
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* Any calls to this function must have a symmetric call to
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* enable_rpm_wakeref_asserts().
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*/
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static inline void
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disable_rpm_wakeref_asserts(struct intel_runtime_pm *rpm)
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{
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atomic_add(INTEL_RPM_WAKELOCK_BIAS + 1,
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&rpm->wakeref_count);
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}
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/**
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* enable_rpm_wakeref_asserts - re-enable the RPM assert checks
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* @rpm: the intel_runtime_pm structure
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*
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* This function re-enables the RPM assert checks after disabling them with
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* disable_rpm_wakeref_asserts. It's meant to be used only in special
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* circumstances otherwise its use should be avoided.
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*
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* Any calls to this function must have a symmetric call to
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* disable_rpm_wakeref_asserts().
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*/
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static inline void
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enable_rpm_wakeref_asserts(struct intel_runtime_pm *rpm)
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{
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atomic_sub(INTEL_RPM_WAKELOCK_BIAS + 1,
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&rpm->wakeref_count);
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}
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void intel_runtime_pm_init_early(struct intel_runtime_pm *rpm);
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void intel_runtime_pm_enable(struct intel_runtime_pm *rpm);
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void intel_runtime_pm_disable(struct intel_runtime_pm *rpm);
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void intel_runtime_pm_cleanup(struct intel_runtime_pm *rpm);
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intel_wakeref_t intel_runtime_pm_get(struct intel_runtime_pm *rpm);
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intel_wakeref_t intel_runtime_pm_get_if_in_use(struct intel_runtime_pm *rpm);
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intel_wakeref_t intel_runtime_pm_get_noresume(struct intel_runtime_pm *rpm);
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intel_wakeref_t intel_runtime_pm_get_raw(struct intel_runtime_pm *rpm);
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#define with_intel_runtime_pm(rpm, wf) \
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for ((wf) = intel_runtime_pm_get(rpm); (wf); \
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intel_runtime_pm_put((rpm), (wf)), (wf) = 0)
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#define with_intel_runtime_pm_if_in_use(rpm, wf) \
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for ((wf) = intel_runtime_pm_get_if_in_use(rpm); (wf); \
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intel_runtime_pm_put((rpm), (wf)), (wf) = 0)
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void intel_runtime_pm_put_unchecked(struct intel_runtime_pm *rpm);
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#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM)
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void intel_runtime_pm_put(struct intel_runtime_pm *rpm, intel_wakeref_t wref);
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#else
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static inline void
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intel_runtime_pm_put(struct intel_runtime_pm *rpm, intel_wakeref_t wref)
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{
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intel_runtime_pm_put_unchecked(rpm);
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}
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#endif
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void intel_runtime_pm_put_raw(struct intel_runtime_pm *rpm, intel_wakeref_t wref);
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#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM)
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void print_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm,
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struct drm_printer *p);
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#else
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static inline void print_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm,
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struct drm_printer *p)
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{
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}
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#endif
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#endif /* __INTEL_RUNTIME_PM_H__ */
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