drivers/gpu/drm/radeon/radeon_irq_kms.c - linux - Git at Google

 /*
  * Copyright 2008 Advanced Micro Devices, Inc.
  * Copyright 2008 Red Hat Inc.
  * Copyright 2009 Jerome Glisse.
  *
  * 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, sublicense,
  * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
  *
  * Authors: Dave Airlie
  *          Alex Deucher
  *          Jerome Glisse
  */
 #include <drm/drmP.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/radeon_drm.h>
 #include "radeon_reg.h"
 #include "radeon.h"
 #include "atom.h"

 #include <linux/pm_runtime.h>

 #define RADEON_WAIT_IDLE_TIMEOUT 200

 /**
  * radeon_driver_irq_handler_kms - irq handler for KMS
  *
  * @int irq, void *arg: args
  *
  * This is the irq handler for the radeon KMS driver (all asics).
  * radeon_irq_process is a macro that points to the per-asic
  * irq handler callback.
  */
 irqreturn_t radeon_driver_irq_handler_kms(int irq, void *arg)
 {
 	struct drm_device *dev = (struct drm_device *) arg;
 	struct radeon_device *rdev = dev->dev_private;
 	irqreturn_t ret;

 	ret = radeon_irq_process(rdev);
 	if (ret == IRQ_HANDLED)
 		pm_runtime_mark_last_busy(dev->dev);
 	return ret;
 }

 /*
  * Handle hotplug events outside the interrupt handler proper.
  */
 /**
  * radeon_hotplug_work_func - display hotplug work handler
  *
  * @work: work struct
  *
  * This is the hot plug event work handler (all asics).
  * The work gets scheduled from the irq handler if there
  * was a hot plug interrupt.  It walks the connector table
  * and calls the hotplug handler for each one, then sends
  * a drm hotplug event to alert userspace.
  */
 static void radeon_hotplug_work_func(struct work_struct *work)
 {
 	struct radeon_device *rdev = container_of(work, struct radeon_device,
 						  hotplug_work);
 	struct drm_device *dev = rdev->ddev;
 	struct drm_mode_config *mode_config = &dev->mode_config;
 	struct drm_connector *connector;

 	if (mode_config->num_connector) {
 		list_for_each_entry(connector, &mode_config->connector_list, head)
 			radeon_connector_hotplug(connector);
 	}
 	/* Just fire off a uevent and let userspace tell us what to do */
 	drm_helper_hpd_irq_event(dev);
 }

 /**
  * radeon_irq_reset_work_func - execute gpu reset
  *
  * @work: work struct
  *
  * Execute scheduled gpu reset (cayman+).
  * This function is called when the irq handler
  * thinks we need a gpu reset.
  */
 static void radeon_irq_reset_work_func(struct work_struct *work)
 {
 	struct radeon_device *rdev = container_of(work, struct radeon_device,
 						  reset_work);

 	radeon_gpu_reset(rdev);
 }

 /**
  * radeon_driver_irq_preinstall_kms - drm irq preinstall callback
  *
  * @dev: drm dev pointer
  *
  * Gets the hw ready to enable irqs (all asics).
  * This function disables all interrupt sources on the GPU.
  */
 void radeon_driver_irq_preinstall_kms(struct drm_device *dev)
 {
 	struct radeon_device *rdev = dev->dev_private;
 	unsigned long irqflags;
 	unsigned i;

 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
 	/* Disable *all* interrupts */
 	for (i = 0; i < RADEON_NUM_RINGS; i++)
 		atomic_set(&rdev->irq.ring_int[i], 0);
 	rdev->irq.dpm_thermal = false;
 	for (i = 0; i < RADEON_MAX_HPD_PINS; i++)
 		rdev->irq.hpd[i] = false;
 	for (i = 0; i < RADEON_MAX_CRTCS; i++) {
 		rdev->irq.crtc_vblank_int[i] = false;
 		atomic_set(&rdev->irq.pflip[i], 0);
 		rdev->irq.afmt[i] = false;
 	}
 	radeon_irq_set(rdev);
 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 	/* Clear bits */
 	radeon_irq_process(rdev);
 }

 /**
  * radeon_driver_irq_postinstall_kms - drm irq preinstall callback
  *
  * @dev: drm dev pointer
  *
  * Handles stuff to be done after enabling irqs (all asics).
  * Returns 0 on success.
  */
 int radeon_driver_irq_postinstall_kms(struct drm_device *dev)
 {
 	dev->max_vblank_count = 0x001fffff;
 	return 0;
 }

 /**
  * radeon_driver_irq_uninstall_kms - drm irq uninstall callback
  *
  * @dev: drm dev pointer
  *
  * This function disables all interrupt sources on the GPU (all asics).
  */
 void radeon_driver_irq_uninstall_kms(struct drm_device *dev)
 {
 	struct radeon_device *rdev = dev->dev_private;
 	unsigned long irqflags;
 	unsigned i;

 	if (rdev == NULL) {
 		return;
 	}
 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
 	/* Disable *all* interrupts */
 	for (i = 0; i < RADEON_NUM_RINGS; i++)
 		atomic_set(&rdev->irq.ring_int[i], 0);
 	rdev->irq.dpm_thermal = false;
 	for (i = 0; i < RADEON_MAX_HPD_PINS; i++)
 		rdev->irq.hpd[i] = false;
 	for (i = 0; i < RADEON_MAX_CRTCS; i++) {
 		rdev->irq.crtc_vblank_int[i] = false;
 		atomic_set(&rdev->irq.pflip[i], 0);
 		rdev->irq.afmt[i] = false;
 	}
 	radeon_irq_set(rdev);
 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 }

 /**
  * radeon_msi_ok - asic specific msi checks
  *
  * @rdev: radeon device pointer
  *
  * Handles asic specific MSI checks to determine if
  * MSIs should be enabled on a particular chip (all asics).
  * Returns true if MSIs should be enabled, false if MSIs
  * should not be enabled.
  */
 static bool radeon_msi_ok(struct radeon_device *rdev)
 {
 	/* RV370/RV380 was first asic with MSI support */
 	if (rdev->family < CHIP_RV380)
 		return false;

 	/* MSIs don't work on AGP */
 	if (rdev->flags & RADEON_IS_AGP)
 		return false;

 	/* force MSI on */
 	if (radeon_msi == 1)
 		return true;
 	else if (radeon_msi == 0)
 		return false;

 	/* Quirks */
 	/* HP RS690 only seems to work with MSIs. */
 	if ((rdev->pdev->device == 0x791f) &&
 	    (rdev->pdev->subsystem_vendor == 0x103c) &&
 	    (rdev->pdev->subsystem_device == 0x30c2))
 		return true;

 	/* Dell RS690 only seems to work with MSIs. */
 	if ((rdev->pdev->device == 0x791f) &&
 	    (rdev->pdev->subsystem_vendor == 0x1028) &&
 	    (rdev->pdev->subsystem_device == 0x01fc))
 		return true;

 	/* Dell RS690 only seems to work with MSIs. */
 	if ((rdev->pdev->device == 0x791f) &&
 	    (rdev->pdev->subsystem_vendor == 0x1028) &&
 	    (rdev->pdev->subsystem_device == 0x01fd))
 		return true;

 	/* Gateway RS690 only seems to work with MSIs. */
 	if ((rdev->pdev->device == 0x791f) &&
 	    (rdev->pdev->subsystem_vendor == 0x107b) &&
 	    (rdev->pdev->subsystem_device == 0x0185))
 		return true;

 	/* try and enable MSIs by default on all RS690s */
 	if (rdev->family == CHIP_RS690)
 		return true;

 	/* RV515 seems to have MSI issues where it loses
 	 * MSI rearms occasionally. This leads to lockups and freezes.
 	 * disable it by default.
 	 */
 	if (rdev->family == CHIP_RV515)
 		return false;
 	if (rdev->flags & RADEON_IS_IGP) {
 		/* APUs work fine with MSIs */
 		if (rdev->family >= CHIP_PALM)
 			return true;
 		/* lots of IGPs have problems with MSIs */
 		return false;
 	}

 	return true;
 }

 /**
  * radeon_irq_kms_init - init driver interrupt info
  *
  * @rdev: radeon device pointer
  *
  * Sets up the work irq handlers, vblank init, MSIs, etc. (all asics).
  * Returns 0 for success, error for failure.
  */
 int radeon_irq_kms_init(struct radeon_device *rdev)
 {
 	int r = 0;

 	spin_lock_init(&rdev->irq.lock);
 	r = drm_vblank_init(rdev->ddev, rdev->num_crtc);
 	if (r) {
 		return r;
 	}
 	/* enable msi */
 	rdev->msi_enabled = 0;

 	if (radeon_msi_ok(rdev)) {
 		int ret = pci_enable_msi(rdev->pdev);
 		if (!ret) {
 			rdev->msi_enabled = 1;
 			dev_info(rdev->dev, "radeon: using MSI.\n");
 		}
 	}

 	INIT_WORK(&rdev->hotplug_work, radeon_hotplug_work_func);
 	INIT_WORK(&rdev->audio_work, r600_audio_update_hdmi);
 	INIT_WORK(&rdev->reset_work, radeon_irq_reset_work_func);

 	rdev->irq.installed = true;
 	r = drm_irq_install(rdev->ddev);
 	if (r) {
 		rdev->irq.installed = false;
 		flush_work(&rdev->hotplug_work);
 		return r;
 	}

 	DRM_INFO("radeon: irq initialized.\n");
 	return 0;
 }

 /**
  * radeon_irq_kms_fini - tear down driver interrupt info
  *
  * @rdev: radeon device pointer
  *
  * Tears down the work irq handlers, vblank handlers, MSIs, etc. (all asics).
  */
 void radeon_irq_kms_fini(struct radeon_device *rdev)
 {
 	drm_vblank_cleanup(rdev->ddev);
 	if (rdev->irq.installed) {
 		drm_irq_uninstall(rdev->ddev);
 		rdev->irq.installed = false;
 		if (rdev->msi_enabled)
 			pci_disable_msi(rdev->pdev);
 		flush_work(&rdev->hotplug_work);
 	}
 }

 /**
  * radeon_irq_kms_sw_irq_get - enable software interrupt
  *
  * @rdev: radeon device pointer
  * @ring: ring whose interrupt you want to enable
  *
  * Enables the software interrupt for a specific ring (all asics).
  * The software interrupt is generally used to signal a fence on
  * a particular ring.
  */
 void radeon_irq_kms_sw_irq_get(struct radeon_device *rdev, int ring)
 {
 	unsigned long irqflags;

 	if (!rdev->ddev->irq_enabled)
 		return;

 	if (atomic_inc_return(&rdev->irq.ring_int[ring]) == 1) {
 		spin_lock_irqsave(&rdev->irq.lock, irqflags);
 		radeon_irq_set(rdev);
 		spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 	}
 }

 /**
  * radeon_irq_kms_sw_irq_put - disable software interrupt
  *
  * @rdev: radeon device pointer
  * @ring: ring whose interrupt you want to disable
  *
  * Disables the software interrupt for a specific ring (all asics).
  * The software interrupt is generally used to signal a fence on
  * a particular ring.
  */
 void radeon_irq_kms_sw_irq_put(struct radeon_device *rdev, int ring)
 {
 	unsigned long irqflags;

 	if (!rdev->ddev->irq_enabled)
 		return;

 	if (atomic_dec_and_test(&rdev->irq.ring_int[ring])) {
 		spin_lock_irqsave(&rdev->irq.lock, irqflags);
 		radeon_irq_set(rdev);
 		spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 	}
 }

 /**
  * radeon_irq_kms_pflip_irq_get - enable pageflip interrupt
  *
  * @rdev: radeon device pointer
  * @crtc: crtc whose interrupt you want to enable
  *
  * Enables the pageflip interrupt for a specific crtc (all asics).
  * For pageflips we use the vblank interrupt source.
  */
 void radeon_irq_kms_pflip_irq_get(struct radeon_device *rdev, int crtc)
 {
 	unsigned long irqflags;

 	if (crtc < 0 || crtc >= rdev->num_crtc)
 		return;

 	if (!rdev->ddev->irq_enabled)
 		return;

 	if (atomic_inc_return(&rdev->irq.pflip[crtc]) == 1) {
 		spin_lock_irqsave(&rdev->irq.lock, irqflags);
 		radeon_irq_set(rdev);
 		spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 	}
 }

 /**
  * radeon_irq_kms_pflip_irq_put - disable pageflip interrupt
  *
  * @rdev: radeon device pointer
  * @crtc: crtc whose interrupt you want to disable
  *
  * Disables the pageflip interrupt for a specific crtc (all asics).
  * For pageflips we use the vblank interrupt source.
  */
 void radeon_irq_kms_pflip_irq_put(struct radeon_device *rdev, int crtc)
 {
 	unsigned long irqflags;

 	if (crtc < 0 || crtc >= rdev->num_crtc)
 		return;

 	if (!rdev->ddev->irq_enabled)
 		return;

 	if (atomic_dec_and_test(&rdev->irq.pflip[crtc])) {
 		spin_lock_irqsave(&rdev->irq.lock, irqflags);
 		radeon_irq_set(rdev);
 		spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 	}
 }

 /**
  * radeon_irq_kms_enable_afmt - enable audio format change interrupt
  *
  * @rdev: radeon device pointer
  * @block: afmt block whose interrupt you want to enable
  *
  * Enables the afmt change interrupt for a specific afmt block (all asics).
  */
 void radeon_irq_kms_enable_afmt(struct radeon_device *rdev, int block)
 {
 	unsigned long irqflags;

 	if (!rdev->ddev->irq_enabled)
 		return;

 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
 	rdev->irq.afmt[block] = true;
 	radeon_irq_set(rdev);
 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);

 }

 /**
  * radeon_irq_kms_disable_afmt - disable audio format change interrupt
  *
  * @rdev: radeon device pointer
  * @block: afmt block whose interrupt you want to disable
  *
  * Disables the afmt change interrupt for a specific afmt block (all asics).
  */
 void radeon_irq_kms_disable_afmt(struct radeon_device *rdev, int block)
 {
 	unsigned long irqflags;

 	if (!rdev->ddev->irq_enabled)
 		return;

 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
 	rdev->irq.afmt[block] = false;
 	radeon_irq_set(rdev);
 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 }

 /**
  * radeon_irq_kms_enable_hpd - enable hotplug detect interrupt
  *
  * @rdev: radeon device pointer
  * @hpd_mask: mask of hpd pins you want to enable.
  *
  * Enables the hotplug detect interrupt for a specific hpd pin (all asics).
  */
 void radeon_irq_kms_enable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
 {
 	unsigned long irqflags;
 	int i;

 	if (!rdev->ddev->irq_enabled)
 		return;

 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
 	for (i = 0; i < RADEON_MAX_HPD_PINS; ++i)
 		rdev->irq.hpd[i] |= !!(hpd_mask & (1 << i));
 	radeon_irq_set(rdev);
 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 }

 /**
  * radeon_irq_kms_disable_hpd - disable hotplug detect interrupt
  *
  * @rdev: radeon device pointer
  * @hpd_mask: mask of hpd pins you want to disable.
  *
  * Disables the hotplug detect interrupt for a specific hpd pin (all asics).
  */
 void radeon_irq_kms_disable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
 {
 	unsigned long irqflags;
 	int i;

 	if (!rdev->ddev->irq_enabled)
 		return;

 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
 	for (i = 0; i < RADEON_MAX_HPD_PINS; ++i)
 		rdev->irq.hpd[i] &= !(hpd_mask & (1 << i));
 	radeon_irq_set(rdev);
 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 }
	/*
	* Copyright 2008 Advanced Micro Devices, Inc.
	* Copyright 2008 Red Hat Inc.
	* Copyright 2009 Jerome Glisse.
	*
	* 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, sublicense,
	* 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 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 NONINFRINGEMENT. IN NO EVENT SHALL
	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
	*
	* Authors: Dave Airlie
	* Alex Deucher
	* Jerome Glisse
	*/
	#include <drm/drmP.h>
	#include <drm/drm_crtc_helper.h>
	#include <drm/radeon_drm.h>
	#include "radeon_reg.h"
	#include "radeon.h"
	#include "atom.h"

	#include <linux/pm_runtime.h>

	#define RADEON_WAIT_IDLE_TIMEOUT 200

	/**
	* radeon_driver_irq_handler_kms - irq handler for KMS
	*
	* @int irq, void *arg: args
	*
	* This is the irq handler for the radeon KMS driver (all asics).
	* radeon_irq_process is a macro that points to the per-asic
	* irq handler callback.
	*/
	irqreturn_t radeon_driver_irq_handler_kms(int irq, void *arg)
	{
	struct drm_device dev = (struct drm_device ) arg;
	struct radeon_device *rdev = dev->dev_private;
	irqreturn_t ret;

	ret = radeon_irq_process(rdev);
	if (ret == IRQ_HANDLED)
	pm_runtime_mark_last_busy(dev->dev);
	return ret;
	}

	/*
	* Handle hotplug events outside the interrupt handler proper.
	*/
	/**
	* radeon_hotplug_work_func - display hotplug work handler
	*
	* @work: work struct
	*
	* This is the hot plug event work handler (all asics).
	* The work gets scheduled from the irq handler if there
	* was a hot plug interrupt. It walks the connector table
	* and calls the hotplug handler for each one, then sends
	* a drm hotplug event to alert userspace.
	*/
	static void radeon_hotplug_work_func(struct work_struct *work)
	{
	struct radeon_device *rdev = container_of(work, struct radeon_device,
	hotplug_work);
	struct drm_device *dev = rdev->ddev;
	struct drm_mode_config *mode_config = &dev->mode_config;
	struct drm_connector *connector;

	if (mode_config->num_connector) {
	list_for_each_entry(connector, &mode_config->connector_list, head)
	radeon_connector_hotplug(connector);
	}
	/* Just fire off a uevent and let userspace tell us what to do */
	drm_helper_hpd_irq_event(dev);
	}

	/**
	* radeon_irq_reset_work_func - execute gpu reset
	*
	* @work: work struct
	*
	* Execute scheduled gpu reset (cayman+).
	* This function is called when the irq handler
	* thinks we need a gpu reset.
	*/
	static void radeon_irq_reset_work_func(struct work_struct *work)
	{
	struct radeon_device *rdev = container_of(work, struct radeon_device,
	reset_work);

	radeon_gpu_reset(rdev);
	}

	/**
	* radeon_driver_irq_preinstall_kms - drm irq preinstall callback
	*
	* @dev: drm dev pointer
	*
	* Gets the hw ready to enable irqs (all asics).
	* This function disables all interrupt sources on the GPU.
	*/
	void radeon_driver_irq_preinstall_kms(struct drm_device *dev)
	{
	struct radeon_device *rdev = dev->dev_private;
	unsigned long irqflags;
	unsigned i;

	spin_lock_irqsave(&rdev->irq.lock, irqflags);
	/* Disable all interrupts */
	for (i = 0; i < RADEON_NUM_RINGS; i++)
	atomic_set(&rdev->irq.ring_int[i], 0);
	rdev->irq.dpm_thermal = false;
	for (i = 0; i < RADEON_MAX_HPD_PINS; i++)
	rdev->irq.hpd[i] = false;
	for (i = 0; i < RADEON_MAX_CRTCS; i++) {
	rdev->irq.crtc_vblank_int[i] = false;
	atomic_set(&rdev->irq.pflip[i], 0);
	rdev->irq.afmt[i] = false;
	}
	radeon_irq_set(rdev);
	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
	/* Clear bits */
	radeon_irq_process(rdev);
	}

	/**
	* radeon_driver_irq_postinstall_kms - drm irq preinstall callback
	*
	* @dev: drm dev pointer
	*
	* Handles stuff to be done after enabling irqs (all asics).
	* Returns 0 on success.
	*/
	int radeon_driver_irq_postinstall_kms(struct drm_device *dev)
	{
	dev->max_vblank_count = 0x001fffff;
	return 0;
	}

	/**
	* radeon_driver_irq_uninstall_kms - drm irq uninstall callback
	*
	* @dev: drm dev pointer
	*
	* This function disables all interrupt sources on the GPU (all asics).
	*/
	void radeon_driver_irq_uninstall_kms(struct drm_device *dev)
	{
	struct radeon_device *rdev = dev->dev_private;
	unsigned long irqflags;
	unsigned i;

	if (rdev == NULL) {
	return;
	}
	spin_lock_irqsave(&rdev->irq.lock, irqflags);
	/* Disable all interrupts */
	for (i = 0; i < RADEON_NUM_RINGS; i++)
	atomic_set(&rdev->irq.ring_int[i], 0);
	rdev->irq.dpm_thermal = false;
	for (i = 0; i < RADEON_MAX_HPD_PINS; i++)
	rdev->irq.hpd[i] = false;
	for (i = 0; i < RADEON_MAX_CRTCS; i++) {
	rdev->irq.crtc_vblank_int[i] = false;
	atomic_set(&rdev->irq.pflip[i], 0);
	rdev->irq.afmt[i] = false;
	}
	radeon_irq_set(rdev);
	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
	}

	/**
	* radeon_msi_ok - asic specific msi checks
	*
	* @rdev: radeon device pointer
	*
	* Handles asic specific MSI checks to determine if
	* MSIs should be enabled on a particular chip (all asics).
	* Returns true if MSIs should be enabled, false if MSIs
	* should not be enabled.
	*/
	static bool radeon_msi_ok(struct radeon_device *rdev)
	{
	/* RV370/RV380 was first asic with MSI support */
	if (rdev->family < CHIP_RV380)
	return false;

	/* MSIs don't work on AGP */
	if (rdev->flags & RADEON_IS_AGP)
	return false;

	/* force MSI on */
	if (radeon_msi == 1)
	return true;
	else if (radeon_msi == 0)
	return false;

	/* Quirks */
	/* HP RS690 only seems to work with MSIs. */
	if ((rdev->pdev->device == 0x791f) &&
	(rdev->pdev->subsystem_vendor == 0x103c) &&
	(rdev->pdev->subsystem_device == 0x30c2))
	return true;

	/* Dell RS690 only seems to work with MSIs. */
	if ((rdev->pdev->device == 0x791f) &&
	(rdev->pdev->subsystem_vendor == 0x1028) &&
	(rdev->pdev->subsystem_device == 0x01fc))
	return true;

	/* Dell RS690 only seems to work with MSIs. */
	if ((rdev->pdev->device == 0x791f) &&
	(rdev->pdev->subsystem_vendor == 0x1028) &&
	(rdev->pdev->subsystem_device == 0x01fd))
	return true;

	/* Gateway RS690 only seems to work with MSIs. */
	if ((rdev->pdev->device == 0x791f) &&
	(rdev->pdev->subsystem_vendor == 0x107b) &&
	(rdev->pdev->subsystem_device == 0x0185))
	return true;

	/* try and enable MSIs by default on all RS690s */
	if (rdev->family == CHIP_RS690)
	return true;

	/* RV515 seems to have MSI issues where it loses
	* MSI rearms occasionally. This leads to lockups and freezes.
	* disable it by default.
	*/
	if (rdev->family == CHIP_RV515)
	return false;
	if (rdev->flags & RADEON_IS_IGP) {
	/* APUs work fine with MSIs */
	if (rdev->family >= CHIP_PALM)
	return true;
	/* lots of IGPs have problems with MSIs */
	return false;
	}

	return true;
	}

	/**
	* radeon_irq_kms_init - init driver interrupt info
	*
	* @rdev: radeon device pointer
	*
	* Sets up the work irq handlers, vblank init, MSIs, etc. (all asics).
	* Returns 0 for success, error for failure.
	*/
	int radeon_irq_kms_init(struct radeon_device *rdev)
	{
	int r = 0;

	spin_lock_init(&rdev->irq.lock);
	r = drm_vblank_init(rdev->ddev, rdev->num_crtc);
	if (r) {
	return r;
	}
	/* enable msi */
	rdev->msi_enabled = 0;

	if (radeon_msi_ok(rdev)) {
	int ret = pci_enable_msi(rdev->pdev);
	if (!ret) {
	rdev->msi_enabled = 1;
	dev_info(rdev->dev, "radeon: using MSI.\n");
	}
	}

	INIT_WORK(&rdev->hotplug_work, radeon_hotplug_work_func);
	INIT_WORK(&rdev->audio_work, r600_audio_update_hdmi);
	INIT_WORK(&rdev->reset_work, radeon_irq_reset_work_func);

	rdev->irq.installed = true;
	r = drm_irq_install(rdev->ddev);
	if (r) {
	rdev->irq.installed = false;
	flush_work(&rdev->hotplug_work);
	return r;
	}

	DRM_INFO("radeon: irq initialized.\n");
	return 0;
	}

	/**
	* radeon_irq_kms_fini - tear down driver interrupt info
	*
	* @rdev: radeon device pointer
	*
	* Tears down the work irq handlers, vblank handlers, MSIs, etc. (all asics).
	*/
	void radeon_irq_kms_fini(struct radeon_device *rdev)
	{
	drm_vblank_cleanup(rdev->ddev);
	if (rdev->irq.installed) {
	drm_irq_uninstall(rdev->ddev);
	rdev->irq.installed = false;
	if (rdev->msi_enabled)
	pci_disable_msi(rdev->pdev);
	flush_work(&rdev->hotplug_work);
	}
	}

	/**
	* radeon_irq_kms_sw_irq_get - enable software interrupt
	*
	* @rdev: radeon device pointer
	* @ring: ring whose interrupt you want to enable
	*
	* Enables the software interrupt for a specific ring (all asics).
	* The software interrupt is generally used to signal a fence on
	* a particular ring.
	*/
	void radeon_irq_kms_sw_irq_get(struct radeon_device *rdev, int ring)
	{
	unsigned long irqflags;

	if (!rdev->ddev->irq_enabled)
	return;

	if (atomic_inc_return(&rdev->irq.ring_int[ring]) == 1) {
	spin_lock_irqsave(&rdev->irq.lock, irqflags);
	radeon_irq_set(rdev);
	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
	}
	}

	/**
	* radeon_irq_kms_sw_irq_put - disable software interrupt
	*
	* @rdev: radeon device pointer
	* @ring: ring whose interrupt you want to disable
	*
	* Disables the software interrupt for a specific ring (all asics).
	* The software interrupt is generally used to signal a fence on
	* a particular ring.
	*/
	void radeon_irq_kms_sw_irq_put(struct radeon_device *rdev, int ring)
	{
	unsigned long irqflags;

	if (!rdev->ddev->irq_enabled)
	return;

	if (atomic_dec_and_test(&rdev->irq.ring_int[ring])) {
	spin_lock_irqsave(&rdev->irq.lock, irqflags);
	radeon_irq_set(rdev);
	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
	}
	}

	/**
	* radeon_irq_kms_pflip_irq_get - enable pageflip interrupt
	*
	* @rdev: radeon device pointer
	* @crtc: crtc whose interrupt you want to enable
	*
	* Enables the pageflip interrupt for a specific crtc (all asics).
	* For pageflips we use the vblank interrupt source.
	*/
	void radeon_irq_kms_pflip_irq_get(struct radeon_device *rdev, int crtc)
	{
	unsigned long irqflags;

	if (crtc < 0 \|\| crtc >= rdev->num_crtc)
	return;

	if (!rdev->ddev->irq_enabled)
	return;

	if (atomic_inc_return(&rdev->irq.pflip[crtc]) == 1) {
	spin_lock_irqsave(&rdev->irq.lock, irqflags);
	radeon_irq_set(rdev);
	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
	}
	}

	/**
	* radeon_irq_kms_pflip_irq_put - disable pageflip interrupt
	*
	* @rdev: radeon device pointer
	* @crtc: crtc whose interrupt you want to disable
	*
	* Disables the pageflip interrupt for a specific crtc (all asics).
	* For pageflips we use the vblank interrupt source.
	*/
	void radeon_irq_kms_pflip_irq_put(struct radeon_device *rdev, int crtc)
	{
	unsigned long irqflags;

	if (crtc < 0 \|\| crtc >= rdev->num_crtc)
	return;

	if (!rdev->ddev->irq_enabled)
	return;

	if (atomic_dec_and_test(&rdev->irq.pflip[crtc])) {
	spin_lock_irqsave(&rdev->irq.lock, irqflags);
	radeon_irq_set(rdev);
	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
	}
	}

	/**
	* radeon_irq_kms_enable_afmt - enable audio format change interrupt
	*
	* @rdev: radeon device pointer
	* @block: afmt block whose interrupt you want to enable
	*
	* Enables the afmt change interrupt for a specific afmt block (all asics).
	*/
	void radeon_irq_kms_enable_afmt(struct radeon_device *rdev, int block)
	{
	unsigned long irqflags;

	if (!rdev->ddev->irq_enabled)
	return;

	spin_lock_irqsave(&rdev->irq.lock, irqflags);
	rdev->irq.afmt[block] = true;
	radeon_irq_set(rdev);
	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);

	}

	/**
	* radeon_irq_kms_disable_afmt - disable audio format change interrupt
	*
	* @rdev: radeon device pointer
	* @block: afmt block whose interrupt you want to disable
	*
	* Disables the afmt change interrupt for a specific afmt block (all asics).
	*/
	void radeon_irq_kms_disable_afmt(struct radeon_device *rdev, int block)
	{
	unsigned long irqflags;

	if (!rdev->ddev->irq_enabled)
	return;

	spin_lock_irqsave(&rdev->irq.lock, irqflags);
	rdev->irq.afmt[block] = false;
	radeon_irq_set(rdev);
	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
	}

	/**
	* radeon_irq_kms_enable_hpd - enable hotplug detect interrupt
	*
	* @rdev: radeon device pointer
	* @hpd_mask: mask of hpd pins you want to enable.
	*
	* Enables the hotplug detect interrupt for a specific hpd pin (all asics).
	*/
	void radeon_irq_kms_enable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
	{
	unsigned long irqflags;
	int i;

	if (!rdev->ddev->irq_enabled)
	return;

	spin_lock_irqsave(&rdev->irq.lock, irqflags);
	for (i = 0; i < RADEON_MAX_HPD_PINS; ++i)
	rdev->irq.hpd[i] \|= !!(hpd_mask & (1 << i));
	radeon_irq_set(rdev);
	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
	}

	/**
	* radeon_irq_kms_disable_hpd - disable hotplug detect interrupt
	*
	* @rdev: radeon device pointer
	* @hpd_mask: mask of hpd pins you want to disable.
	*
	* Disables the hotplug detect interrupt for a specific hpd pin (all asics).
	*/
	void radeon_irq_kms_disable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
	{
	unsigned long irqflags;
	int i;

	if (!rdev->ddev->irq_enabled)
	return;

	spin_lock_irqsave(&rdev->irq.lock, irqflags);
	for (i = 0; i < RADEON_MAX_HPD_PINS; ++i)
	rdev->irq.hpd[i] &= !(hpd_mask & (1 << i));
	radeon_irq_set(rdev);
	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
	}