/* i915_irq.c -- IRQ support for the I915 -*- linux-c -*- */ /* * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sub license, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice (including the * next paragraph) shall be included in all copies or substantial portions * of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * */ #define pr_fmt(fmt) … #include <linux/slab.h> #include <linux/sysrq.h> #include <drm/drm_drv.h> #include "display/intel_display_irq.h" #include "display/intel_hotplug.h" #include "display/intel_hotplug_irq.h" #include "display/intel_lpe_audio.h" #include "display/intel_psr_regs.h" #include "gt/intel_breadcrumbs.h" #include "gt/intel_gt.h" #include "gt/intel_gt_irq.h" #include "gt/intel_gt_pm_irq.h" #include "gt/intel_gt_regs.h" #include "gt/intel_rps.h" #include "i915_driver.h" #include "i915_drv.h" #include "i915_irq.h" #include "i915_reg.h" /** * DOC: interrupt handling * * These functions provide the basic support for enabling and disabling the * interrupt handling support. There's a lot more functionality in i915_irq.c * and related files, but that will be described in separate chapters. */ /* * Interrupt statistic for PMU. Increments the counter only if the * interrupt originated from the GPU so interrupts from a device which * shares the interrupt line are not accounted. */ static inline void pmu_irq_stats(struct drm_i915_private *i915, irqreturn_t res) { … } void gen3_irq_reset(struct intel_uncore *uncore, i915_reg_t imr, i915_reg_t iir, i915_reg_t ier) { … } static void gen2_irq_reset(struct intel_uncore *uncore) { … } /* * We should clear IMR at preinstall/uninstall, and just check at postinstall. */ void gen3_assert_iir_is_zero(struct intel_uncore *uncore, i915_reg_t reg) { … } static void gen2_assert_iir_is_zero(struct intel_uncore *uncore) { … } void gen3_irq_init(struct intel_uncore *uncore, i915_reg_t imr, u32 imr_val, i915_reg_t ier, u32 ier_val, i915_reg_t iir) { … } static void gen2_irq_init(struct intel_uncore *uncore, u32 imr_val, u32 ier_val) { … } /** * ivb_parity_work - Workqueue called when a parity error interrupt * occurred. * @work: workqueue struct * * Doesn't actually do anything except notify userspace. As a consequence of * this event, userspace should try to remap the bad rows since statistically * it is likely the same row is more likely to go bad again. */ static void ivb_parity_work(struct work_struct *work) { … } static irqreturn_t valleyview_irq_handler(int irq, void *arg) { … } static irqreturn_t cherryview_irq_handler(int irq, void *arg) { … } /* * To handle irqs with the minimum potential races with fresh interrupts, we: * 1 - Disable Master Interrupt Control. * 2 - Find the source(s) of the interrupt. * 3 - Clear the Interrupt Identity bits (IIR). * 4 - Process the interrupt(s) that had bits set in the IIRs. * 5 - Re-enable Master Interrupt Control. */ static irqreturn_t ilk_irq_handler(int irq, void *arg) { … } static inline u32 gen8_master_intr_disable(void __iomem * const regs) { … } static inline void gen8_master_intr_enable(void __iomem * const regs) { … } static irqreturn_t gen8_irq_handler(int irq, void *arg) { … } static inline u32 gen11_master_intr_disable(void __iomem * const regs) { … } static inline void gen11_master_intr_enable(void __iomem * const regs) { … } static irqreturn_t gen11_irq_handler(int irq, void *arg) { … } static inline u32 dg1_master_intr_disable(void __iomem * const regs) { … } static inline void dg1_master_intr_enable(void __iomem * const regs) { … } static irqreturn_t dg1_irq_handler(int irq, void *arg) { … } static void ibx_irq_reset(struct drm_i915_private *dev_priv) { … } /* drm_dma.h hooks */ static void ilk_irq_reset(struct drm_i915_private *dev_priv) { … } static void valleyview_irq_reset(struct drm_i915_private *dev_priv) { … } static void gen8_irq_reset(struct drm_i915_private *dev_priv) { … } static void gen11_irq_reset(struct drm_i915_private *dev_priv) { … } static void dg1_irq_reset(struct drm_i915_private *dev_priv) { … } static void cherryview_irq_reset(struct drm_i915_private *dev_priv) { … } static void ilk_irq_postinstall(struct drm_i915_private *dev_priv) { … } static void valleyview_irq_postinstall(struct drm_i915_private *dev_priv) { … } static void gen8_irq_postinstall(struct drm_i915_private *dev_priv) { … } static void gen11_irq_postinstall(struct drm_i915_private *dev_priv) { … } static void dg1_irq_postinstall(struct drm_i915_private *dev_priv) { … } static void cherryview_irq_postinstall(struct drm_i915_private *dev_priv) { … } static void i8xx_irq_reset(struct drm_i915_private *dev_priv) { … } static u32 i9xx_error_mask(struct drm_i915_private *i915) { … } static void i8xx_irq_postinstall(struct drm_i915_private *dev_priv) { … } static void i8xx_error_irq_ack(struct drm_i915_private *i915, u16 *eir, u16 *eir_stuck) { … } static void i8xx_error_irq_handler(struct drm_i915_private *dev_priv, u16 eir, u16 eir_stuck) { … } static void i9xx_error_irq_ack(struct drm_i915_private *dev_priv, u32 *eir, u32 *eir_stuck) { … } static void i9xx_error_irq_handler(struct drm_i915_private *dev_priv, u32 eir, u32 eir_stuck) { … } static irqreturn_t i8xx_irq_handler(int irq, void *arg) { … } static void i915_irq_reset(struct drm_i915_private *dev_priv) { … } static void i915_irq_postinstall(struct drm_i915_private *dev_priv) { … } static irqreturn_t i915_irq_handler(int irq, void *arg) { … } static void i965_irq_reset(struct drm_i915_private *dev_priv) { … } static u32 i965_error_mask(struct drm_i915_private *i915) { … } static void i965_irq_postinstall(struct drm_i915_private *dev_priv) { … } static irqreturn_t i965_irq_handler(int irq, void *arg) { … } /** * intel_irq_init - initializes irq support * @dev_priv: i915 device instance * * This function initializes all the irq support including work items, timers * and all the vtables. It does not setup the interrupt itself though. */ void intel_irq_init(struct drm_i915_private *dev_priv) { … } /** * intel_irq_fini - deinitializes IRQ support * @i915: i915 device instance * * This function deinitializes all the IRQ support. */ void intel_irq_fini(struct drm_i915_private *i915) { … } static irq_handler_t intel_irq_handler(struct drm_i915_private *dev_priv) { … } static void intel_irq_reset(struct drm_i915_private *dev_priv) { … } static void intel_irq_postinstall(struct drm_i915_private *dev_priv) { … } /** * intel_irq_install - enables the hardware interrupt * @dev_priv: i915 device instance * * This function enables the hardware interrupt handling, but leaves the hotplug * handling still disabled. It is called after intel_irq_init(). * * In the driver load and resume code we need working interrupts in a few places * but don't want to deal with the hassle of concurrent probe and hotplug * workers. Hence the split into this two-stage approach. */ int intel_irq_install(struct drm_i915_private *dev_priv) { … } /** * intel_irq_uninstall - finilizes all irq handling * @dev_priv: i915 device instance * * This stops interrupt and hotplug handling and unregisters and frees all * resources acquired in the init functions. */ void intel_irq_uninstall(struct drm_i915_private *dev_priv) { … } /** * intel_runtime_pm_disable_interrupts - runtime interrupt disabling * @dev_priv: i915 device instance * * This function is used to disable interrupts at runtime, both in the runtime * pm and the system suspend/resume code. */ void intel_runtime_pm_disable_interrupts(struct drm_i915_private *dev_priv) { … } /** * intel_runtime_pm_enable_interrupts - runtime interrupt enabling * @dev_priv: i915 device instance * * This function is used to enable interrupts at runtime, both in the runtime * pm and the system suspend/resume code. */ void intel_runtime_pm_enable_interrupts(struct drm_i915_private *dev_priv) { … } bool intel_irqs_enabled(struct drm_i915_private *dev_priv) { … } void intel_synchronize_irq(struct drm_i915_private *i915) { … } void intel_synchronize_hardirq(struct drm_i915_private *i915) { … }
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