linux/drivers/gpu/drm/vmwgfx/vmwgfx_irq.c

// SPDX-License-Identifier: GPL-2.0 OR MIT
/**************************************************************************
 *
 * Copyright 2009-2015 VMware, Inc., Palo Alto, CA., USA
 *
 * 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
 * THE COPYRIGHT HOLDERS, AUTHORS 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.
 *
 **************************************************************************/

#include <linux/pci.h>
#include <linux/sched/signal.h>

#include "vmwgfx_drv.h"

#define VMW_FENCE_WRAP …

static u32 vmw_irqflag_fence_goal(struct vmw_private *vmw)
{ … }

/**
 * vmw_thread_fn - Deferred (process context) irq handler
 *
 * @irq: irq number
 * @arg: Closure argument. Pointer to a struct drm_device cast to void *
 *
 * This function implements the deferred part of irq processing.
 * The function is guaranteed to run at least once after the
 * vmw_irq_handler has returned with IRQ_WAKE_THREAD.
 *
 */
static irqreturn_t vmw_thread_fn(int irq, void *arg)
{ … }

/**
 * vmw_irq_handler: irq handler
 *
 * @irq: irq number
 * @arg: Closure argument. Pointer to a struct drm_device cast to void *
 *
 * This function implements the quick part of irq processing.
 * The function performs fast actions like clearing the device interrupt
 * flags and also reasonably quick actions like waking processes waiting for
 * FIFO space. Other IRQ actions are deferred to the IRQ thread.
 */
static irqreturn_t vmw_irq_handler(int irq, void *arg)
{ … }

static bool vmw_fifo_idle(struct vmw_private *dev_priv, uint32_t seqno)
{ … }

void vmw_update_seqno(struct vmw_private *dev_priv)
{ … }

bool vmw_seqno_passed(struct vmw_private *dev_priv,
			 uint32_t seqno)
{ … }

int vmw_fallback_wait(struct vmw_private *dev_priv,
		      bool lazy,
		      bool fifo_idle,
		      uint32_t seqno,
		      bool interruptible,
		      unsigned long timeout)
{ … }

void vmw_generic_waiter_add(struct vmw_private *dev_priv,
			    u32 flag, int *waiter_count)
{ … }

void vmw_generic_waiter_remove(struct vmw_private *dev_priv,
			       u32 flag, int *waiter_count)
{ … }

void vmw_seqno_waiter_add(struct vmw_private *dev_priv)
{ … }

void vmw_seqno_waiter_remove(struct vmw_private *dev_priv)
{ … }

void vmw_goal_waiter_add(struct vmw_private *dev_priv)
{ … }

void vmw_goal_waiter_remove(struct vmw_private *dev_priv)
{ … }

static void vmw_irq_preinstall(struct drm_device *dev)
{ … }

void vmw_irq_uninstall(struct drm_device *dev)
{ … }

/**
 * vmw_irq_install - Install the irq handlers
 *
 * @dev_priv:  Pointer to the vmw_private device.
 * Return:  Zero if successful. Negative number otherwise.
 */
int vmw_irq_install(struct vmw_private *dev_priv)
{ … }