drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c - kernel/msm-5.4 - Gitiles

 /*
  * 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 <linux/irq.h>
 #include <drm/drmP.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/amdgpu_drm.h>
 #include "amdgpu.h"
 #include "amdgpu_ih.h"
 #include "atom.h"
 #include "amdgpu_connectors.h"
 #include "amdgpu_trace.h"

 #include <linux/pm_runtime.h>

 #ifdef CONFIG_DRM_AMD_DC
 #include "amdgpu_dm_irq.h"
 #endif

 #define AMDGPU_WAIT_IDLE_TIMEOUT 200

 /*
  * Handle hotplug events outside the interrupt handler proper.
  */
 /**
  * amdgpu_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 amdgpu_hotplug_work_func(struct work_struct *work)
 {
 	struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
 						  hotplug_work);
 	struct drm_device *dev = adev->ddev;
 	struct drm_mode_config *mode_config = &dev->mode_config;
 	struct drm_connector *connector;

 	mutex_lock(&mode_config->mutex);
 	list_for_each_entry(connector, &mode_config->connector_list, head)
 		amdgpu_connector_hotplug(connector);
 	mutex_unlock(&mode_config->mutex);
 	/* Just fire off a uevent and let userspace tell us what to do */
 	drm_helper_hpd_irq_event(dev);
 }

 /**
  * amdgpu_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 amdgpu_irq_reset_work_func(struct work_struct *work)
 {
 	struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
 						  reset_work);

 	if (!amdgpu_sriov_vf(adev))
 		amdgpu_device_gpu_recover(adev, NULL, false);
 }

 /* Disable *all* interrupts */
 void amdgpu_irq_disable_all(struct amdgpu_device *adev)
 {
 	unsigned long irqflags;
 	unsigned i, j, k;
 	int r;

 	spin_lock_irqsave(&adev->irq.lock, irqflags);
 	for (i = 0; i < AMDGPU_IH_CLIENTID_MAX; ++i) {
 		if (!adev->irq.client[i].sources)
 			continue;

 		for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
 			struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];

 			if (!src || !src->funcs->set || !src->num_types)
 				continue;

 			for (k = 0; k < src->num_types; ++k) {
 				atomic_set(&src->enabled_types[k], 0);
 				r = src->funcs->set(adev, src, k,
 						    AMDGPU_IRQ_STATE_DISABLE);
 				if (r)
 					DRM_ERROR("error disabling interrupt (%d)\n",
 						  r);
 			}
 		}
 	}
 	spin_unlock_irqrestore(&adev->irq.lock, irqflags);
 }

 /**
  * amdgpu_irq_handler - irq handler
  *
  * @int irq, void *arg: args
  *
  * This is the irq handler for the amdgpu driver (all asics).
  */
 irqreturn_t amdgpu_irq_handler(int irq, void *arg)
 {
 	struct drm_device *dev = (struct drm_device *) arg;
 	struct amdgpu_device *adev = dev->dev_private;
 	irqreturn_t ret;

 	ret = amdgpu_ih_process(adev);
 	if (ret == IRQ_HANDLED)
 		pm_runtime_mark_last_busy(dev->dev);
 	return ret;
 }

 /**
  * amdgpu_msi_ok - asic specific msi checks
  *
  * @adev: amdgpu 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 amdgpu_msi_ok(struct amdgpu_device *adev)
 {
 	/* force MSI on */
 	if (amdgpu_msi == 1)
 		return true;
 	else if (amdgpu_msi == 0)
 		return false;

 	return true;
 }

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

 	spin_lock_init(&adev->irq.lock);

 	/* enable msi */
 	adev->irq.msi_enabled = false;

 	if (amdgpu_msi_ok(adev)) {
 		int ret = pci_enable_msi(adev->pdev);
 		if (!ret) {
 			adev->irq.msi_enabled = true;
 			dev_dbg(adev->dev, "amdgpu: using MSI.\n");
 		}
 	}

 	if (!amdgpu_device_has_dc_support(adev)) {
 		if (!adev->enable_virtual_display)
 			/* Disable vblank irqs aggressively for power-saving */
 			/* XXX: can this be enabled for DC? */
 			adev->ddev->vblank_disable_immediate = true;

 		r = drm_vblank_init(adev->ddev, adev->mode_info.num_crtc);
 		if (r)
 			return r;

 		/* pre DCE11 */
 		INIT_WORK(&adev->hotplug_work,
 				amdgpu_hotplug_work_func);
 	}

 	INIT_WORK(&adev->reset_work, amdgpu_irq_reset_work_func);

 	adev->irq.installed = true;
 	r = drm_irq_install(adev->ddev, adev->ddev->pdev->irq);
 	if (r) {
 		adev->irq.installed = false;
 		if (!amdgpu_device_has_dc_support(adev))
 			flush_work(&adev->hotplug_work);
 		cancel_work_sync(&adev->reset_work);
 		return r;
 	}
 	adev->ddev->max_vblank_count = 0x00ffffff;

 	DRM_DEBUG("amdgpu: irq initialized.\n");
 	return 0;
 }

 /**
  * amdgpu_irq_fini - tear down driver interrupt info
  *
  * @adev: amdgpu device pointer
  *
  * Tears down the work irq handlers, vblank handlers, MSIs, etc. (all asics).
  */
 void amdgpu_irq_fini(struct amdgpu_device *adev)
 {
 	unsigned i, j;

 	if (adev->irq.installed) {
 		drm_irq_uninstall(adev->ddev);
 		adev->irq.installed = false;
 		if (adev->irq.msi_enabled)
 			pci_disable_msi(adev->pdev);
 		if (!amdgpu_device_has_dc_support(adev))
 			flush_work(&adev->hotplug_work);
 		cancel_work_sync(&adev->reset_work);
 	}

 	for (i = 0; i < AMDGPU_IH_CLIENTID_MAX; ++i) {
 		if (!adev->irq.client[i].sources)
 			continue;

 		for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
 			struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];

 			if (!src)
 				continue;

 			kfree(src->enabled_types);
 			src->enabled_types = NULL;
 			if (src->data) {
 				kfree(src->data);
 				kfree(src);
 				adev->irq.client[i].sources[j] = NULL;
 			}
 		}
 		kfree(adev->irq.client[i].sources);
 	}
 }

 /**
  * amdgpu_irq_add_id - register irq source
  *
  * @adev: amdgpu device pointer
  * @src_id: source id for this source
  * @source: irq source
  *
  */
 int amdgpu_irq_add_id(struct amdgpu_device *adev,
 		      unsigned client_id, unsigned src_id,
 		      struct amdgpu_irq_src *source)
 {
 	if (client_id >= AMDGPU_IH_CLIENTID_MAX)
 		return -EINVAL;

 	if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
 		return -EINVAL;

 	if (!source->funcs)
 		return -EINVAL;

 	if (!adev->irq.client[client_id].sources) {
 		adev->irq.client[client_id].sources =
 			kcalloc(AMDGPU_MAX_IRQ_SRC_ID,
 				sizeof(struct amdgpu_irq_src *),
 				GFP_KERNEL);
 		if (!adev->irq.client[client_id].sources)
 			return -ENOMEM;
 	}

 	if (adev->irq.client[client_id].sources[src_id] != NULL)
 		return -EINVAL;

 	if (source->num_types && !source->enabled_types) {
 		atomic_t *types;

 		types = kcalloc(source->num_types, sizeof(atomic_t),
 				GFP_KERNEL);
 		if (!types)
 			return -ENOMEM;

 		source->enabled_types = types;
 	}

 	adev->irq.client[client_id].sources[src_id] = source;
 	return 0;
 }

 /**
  * amdgpu_irq_dispatch - dispatch irq to IP blocks
  *
  * @adev: amdgpu device pointer
  * @entry: interrupt vector
  *
  * Dispatches the irq to the different IP blocks
  */
 void amdgpu_irq_dispatch(struct amdgpu_device *adev,
 			 struct amdgpu_iv_entry *entry)
 {
 	unsigned client_id = entry->client_id;
 	unsigned src_id = entry->src_id;
 	struct amdgpu_irq_src *src;
 	int r;

 	trace_amdgpu_iv(entry);

 	if (client_id >= AMDGPU_IH_CLIENTID_MAX) {
 		DRM_DEBUG("Invalid client_id in IV: %d\n", client_id);
 		return;
 	}

 	if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
 		DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
 		return;
 	}

 	if (adev->irq.virq[src_id]) {
 		generic_handle_irq(irq_find_mapping(adev->irq.domain, src_id));
 	} else {
 		if (!adev->irq.client[client_id].sources) {
 			DRM_DEBUG("Unregistered interrupt client_id: %d src_id: %d\n",
 				  client_id, src_id);
 			return;
 		}

 		src = adev->irq.client[client_id].sources[src_id];
 		if (!src) {
 			DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
 			return;
 		}

 		r = src->funcs->process(adev, src, entry);
 		if (r)
 			DRM_ERROR("error processing interrupt (%d)\n", r);
 	}
 }

 /**
  * amdgpu_irq_update - update hw interrupt state
  *
  * @adev: amdgpu device pointer
  * @src: interrupt src you want to enable
  * @type: type of interrupt you want to update
  *
  * Updates the interrupt state for a specific src (all asics).
  */
 int amdgpu_irq_update(struct amdgpu_device *adev,
 			     struct amdgpu_irq_src *src, unsigned type)
 {
 	unsigned long irqflags;
 	enum amdgpu_interrupt_state state;
 	int r;

 	spin_lock_irqsave(&adev->irq.lock, irqflags);

 	/* we need to determine after taking the lock, otherwise
 	   we might disable just enabled interrupts again */
 	if (amdgpu_irq_enabled(adev, src, type))
 		state = AMDGPU_IRQ_STATE_ENABLE;
 	else
 		state = AMDGPU_IRQ_STATE_DISABLE;

 	r = src->funcs->set(adev, src, type, state);
 	spin_unlock_irqrestore(&adev->irq.lock, irqflags);
 	return r;
 }

 void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
 {
 	int i, j, k;

 	for (i = 0; i < AMDGPU_IH_CLIENTID_MAX; ++i) {
 		if (!adev->irq.client[i].sources)
 			continue;

 		for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
 			struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];

 			if (!src)
 				continue;
 			for (k = 0; k < src->num_types; k++)
 				amdgpu_irq_update(adev, src, k);
 		}
 	}
 }

 /**
  * amdgpu_irq_get - enable interrupt
  *
  * @adev: amdgpu device pointer
  * @src: interrupt src you want to enable
  * @type: type of interrupt you want to enable
  *
  * Enables the interrupt type for a specific src (all asics).
  */
 int amdgpu_irq_get(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
 		   unsigned type)
 {
 	if (!adev->ddev->irq_enabled)
 		return -ENOENT;

 	if (type >= src->num_types)
 		return -EINVAL;

 	if (!src->enabled_types || !src->funcs->set)
 		return -EINVAL;

 	if (atomic_inc_return(&src->enabled_types[type]) == 1)
 		return amdgpu_irq_update(adev, src, type);

 	return 0;
 }

 /**
  * amdgpu_irq_put - disable interrupt
  *
  * @adev: amdgpu device pointer
  * @src: interrupt src you want to disable
  * @type: type of interrupt you want to disable
  *
  * Disables the interrupt type for a specific src (all asics).
  */
 int amdgpu_irq_put(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
 		   unsigned type)
 {
 	if (!adev->ddev->irq_enabled)
 		return -ENOENT;

 	if (type >= src->num_types)
 		return -EINVAL;

 	if (!src->enabled_types || !src->funcs->set)
 		return -EINVAL;

 	if (atomic_dec_and_test(&src->enabled_types[type]))
 		return amdgpu_irq_update(adev, src, type);

 	return 0;
 }

 /**
  * amdgpu_irq_enabled - test if irq is enabled or not
  *
  * @adev: amdgpu device pointer
  * @idx: interrupt src you want to test
  *
  * Tests if the given interrupt source is enabled or not
  */
 bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
 			unsigned type)
 {
 	if (!adev->ddev->irq_enabled)
 		return false;

 	if (type >= src->num_types)
 		return false;

 	if (!src->enabled_types || !src->funcs->set)
 		return false;

 	return !!atomic_read(&src->enabled_types[type]);
 }

 /* gen irq */
 static void amdgpu_irq_mask(struct irq_data *irqd)
 {
 	/* XXX */
 }

 static void amdgpu_irq_unmask(struct irq_data *irqd)
 {
 	/* XXX */
 }

 static struct irq_chip amdgpu_irq_chip = {
 	.name = "amdgpu-ih",
 	.irq_mask = amdgpu_irq_mask,
 	.irq_unmask = amdgpu_irq_unmask,
 };

 static int amdgpu_irqdomain_map(struct irq_domain *d,
 				unsigned int irq, irq_hw_number_t hwirq)
 {
 	if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
 		return -EPERM;

 	irq_set_chip_and_handler(irq,
 				 &amdgpu_irq_chip, handle_simple_irq);
 	return 0;
 }

 static const struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
 	.map = amdgpu_irqdomain_map,
 };

 /**
  * amdgpu_irq_add_domain - create a linear irq domain
  *
  * @adev: amdgpu device pointer
  *
  * Create an irq domain for GPU interrupt sources
  * that may be driven by another driver (e.g., ACP).
  */
 int amdgpu_irq_add_domain(struct amdgpu_device *adev)
 {
 	adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
 						 &amdgpu_hw_irqdomain_ops, adev);
 	if (!adev->irq.domain) {
 		DRM_ERROR("GPU irq add domain failed\n");
 		return -ENODEV;
 	}

 	return 0;
 }

 /**
  * amdgpu_irq_remove_domain - remove the irq domain
  *
  * @adev: amdgpu device pointer
  *
  * Remove the irq domain for GPU interrupt sources
  * that may be driven by another driver (e.g., ACP).
  */
 void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
 {
 	if (adev->irq.domain) {
 		irq_domain_remove(adev->irq.domain);
 		adev->irq.domain = NULL;
 	}
 }

 /**
  * amdgpu_irq_create_mapping - create a mapping between a domain irq and a
  *                             Linux irq
  *
  * @adev: amdgpu device pointer
  * @src_id: IH source id
  *
  * Create a mapping between a domain irq (GPU IH src id) and a Linux irq
  * Use this for components that generate a GPU interrupt, but are driven
  * by a different driver (e.g., ACP).
  * Returns the Linux irq.
  */
 unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id)
 {
 	adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);

 	return adev->irq.virq[src_id];
 }
	/*
	* 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 <linux/irq.h>
	#include <drm/drmP.h>
	#include <drm/drm_crtc_helper.h>
	#include <drm/amdgpu_drm.h>
	#include "amdgpu.h"
	#include "amdgpu_ih.h"
	#include "atom.h"
	#include "amdgpu_connectors.h"
	#include "amdgpu_trace.h"

	#include <linux/pm_runtime.h>

	#ifdef CONFIG_DRM_AMD_DC
	#include "amdgpu_dm_irq.h"
	#endif

	#define AMDGPU_WAIT_IDLE_TIMEOUT 200

	/*
	* Handle hotplug events outside the interrupt handler proper.
	*/
	/**
	* amdgpu_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 amdgpu_hotplug_work_func(struct work_struct *work)
	{
	struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
	hotplug_work);
	struct drm_device *dev = adev->ddev;
	struct drm_mode_config *mode_config = &dev->mode_config;
	struct drm_connector *connector;

	mutex_lock(&mode_config->mutex);
	list_for_each_entry(connector, &mode_config->connector_list, head)
	amdgpu_connector_hotplug(connector);
	mutex_unlock(&mode_config->mutex);
	/* Just fire off a uevent and let userspace tell us what to do */
	drm_helper_hpd_irq_event(dev);
	}

	/**
	* amdgpu_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 amdgpu_irq_reset_work_func(struct work_struct *work)
	{
	struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
	reset_work);

	if (!amdgpu_sriov_vf(adev))
	amdgpu_device_gpu_recover(adev, NULL, false);
	}

	/* Disable all interrupts */
	void amdgpu_irq_disable_all(struct amdgpu_device *adev)
	{
	unsigned long irqflags;
	unsigned i, j, k;
	int r;

	spin_lock_irqsave(&adev->irq.lock, irqflags);
	for (i = 0; i < AMDGPU_IH_CLIENTID_MAX; ++i) {
	if (!adev->irq.client[i].sources)
	continue;

	for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
	struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];

	if (!src \|\| !src->funcs->set \|\| !src->num_types)
	continue;

	for (k = 0; k < src->num_types; ++k) {
	atomic_set(&src->enabled_types[k], 0);
	r = src->funcs->set(adev, src, k,
	AMDGPU_IRQ_STATE_DISABLE);
	if (r)
	DRM_ERROR("error disabling interrupt (%d)\n",
	r);
	}
	}
	}
	spin_unlock_irqrestore(&adev->irq.lock, irqflags);
	}

	/**
	* amdgpu_irq_handler - irq handler
	*
	* @int irq, void *arg: args
	*
	* This is the irq handler for the amdgpu driver (all asics).
	*/
	irqreturn_t amdgpu_irq_handler(int irq, void *arg)
	{
	struct drm_device dev = (struct drm_device ) arg;
	struct amdgpu_device *adev = dev->dev_private;
	irqreturn_t ret;

	ret = amdgpu_ih_process(adev);
	if (ret == IRQ_HANDLED)
	pm_runtime_mark_last_busy(dev->dev);
	return ret;
	}

	/**
	* amdgpu_msi_ok - asic specific msi checks
	*
	* @adev: amdgpu 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 amdgpu_msi_ok(struct amdgpu_device *adev)
	{
	/* force MSI on */
	if (amdgpu_msi == 1)
	return true;
	else if (amdgpu_msi == 0)
	return false;

	return true;
	}

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

	spin_lock_init(&adev->irq.lock);

	/* enable msi */
	adev->irq.msi_enabled = false;

	if (amdgpu_msi_ok(adev)) {
	int ret = pci_enable_msi(adev->pdev);
	if (!ret) {
	adev->irq.msi_enabled = true;
	dev_dbg(adev->dev, "amdgpu: using MSI.\n");
	}
	}

	if (!amdgpu_device_has_dc_support(adev)) {
	if (!adev->enable_virtual_display)
	/* Disable vblank irqs aggressively for power-saving */
	/* XXX: can this be enabled for DC? */
	adev->ddev->vblank_disable_immediate = true;

	r = drm_vblank_init(adev->ddev, adev->mode_info.num_crtc);
	if (r)
	return r;

	/* pre DCE11 */
	INIT_WORK(&adev->hotplug_work,
	amdgpu_hotplug_work_func);
	}

	INIT_WORK(&adev->reset_work, amdgpu_irq_reset_work_func);

	adev->irq.installed = true;
	r = drm_irq_install(adev->ddev, adev->ddev->pdev->irq);
	if (r) {
	adev->irq.installed = false;
	if (!amdgpu_device_has_dc_support(adev))
	flush_work(&adev->hotplug_work);
	cancel_work_sync(&adev->reset_work);
	return r;
	}
	adev->ddev->max_vblank_count = 0x00ffffff;

	DRM_DEBUG("amdgpu: irq initialized.\n");
	return 0;
	}

	/**
	* amdgpu_irq_fini - tear down driver interrupt info
	*
	* @adev: amdgpu device pointer
	*
	* Tears down the work irq handlers, vblank handlers, MSIs, etc. (all asics).
	*/
	void amdgpu_irq_fini(struct amdgpu_device *adev)
	{
	unsigned i, j;

	if (adev->irq.installed) {
	drm_irq_uninstall(adev->ddev);
	adev->irq.installed = false;
	if (adev->irq.msi_enabled)
	pci_disable_msi(adev->pdev);
	if (!amdgpu_device_has_dc_support(adev))
	flush_work(&adev->hotplug_work);
	cancel_work_sync(&adev->reset_work);
	}

	for (i = 0; i < AMDGPU_IH_CLIENTID_MAX; ++i) {
	if (!adev->irq.client[i].sources)
	continue;

	for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
	struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];

	if (!src)
	continue;

	kfree(src->enabled_types);
	src->enabled_types = NULL;
	if (src->data) {
	kfree(src->data);
	kfree(src);
	adev->irq.client[i].sources[j] = NULL;
	}
	}
	kfree(adev->irq.client[i].sources);
	}
	}

	/**
	* amdgpu_irq_add_id - register irq source
	*
	* @adev: amdgpu device pointer
	* @src_id: source id for this source
	* @source: irq source
	*
	*/
	int amdgpu_irq_add_id(struct amdgpu_device *adev,
	unsigned client_id, unsigned src_id,
	struct amdgpu_irq_src *source)
	{
	if (client_id >= AMDGPU_IH_CLIENTID_MAX)
	return -EINVAL;

	if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
	return -EINVAL;

	if (!source->funcs)
	return -EINVAL;

	if (!adev->irq.client[client_id].sources) {
	adev->irq.client[client_id].sources =
	kcalloc(AMDGPU_MAX_IRQ_SRC_ID,
	sizeof(struct amdgpu_irq_src *),
	GFP_KERNEL);
	if (!adev->irq.client[client_id].sources)
	return -ENOMEM;
	}

	if (adev->irq.client[client_id].sources[src_id] != NULL)
	return -EINVAL;

	if (source->num_types && !source->enabled_types) {
	atomic_t *types;

	types = kcalloc(source->num_types, sizeof(atomic_t),
	GFP_KERNEL);
	if (!types)
	return -ENOMEM;

	source->enabled_types = types;
	}

	adev->irq.client[client_id].sources[src_id] = source;
	return 0;
	}

	/**
	* amdgpu_irq_dispatch - dispatch irq to IP blocks
	*
	* @adev: amdgpu device pointer
	* @entry: interrupt vector
	*
	* Dispatches the irq to the different IP blocks
	*/
	void amdgpu_irq_dispatch(struct amdgpu_device *adev,
	struct amdgpu_iv_entry *entry)
	{
	unsigned client_id = entry->client_id;
	unsigned src_id = entry->src_id;
	struct amdgpu_irq_src *src;
	int r;

	trace_amdgpu_iv(entry);

	if (client_id >= AMDGPU_IH_CLIENTID_MAX) {
	DRM_DEBUG("Invalid client_id in IV: %d\n", client_id);
	return;
	}

	if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
	DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
	return;
	}

	if (adev->irq.virq[src_id]) {
	generic_handle_irq(irq_find_mapping(adev->irq.domain, src_id));
	} else {
	if (!adev->irq.client[client_id].sources) {
	DRM_DEBUG("Unregistered interrupt client_id: %d src_id: %d\n",
	client_id, src_id);
	return;
	}

	src = adev->irq.client[client_id].sources[src_id];
	if (!src) {
	DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
	return;
	}

	r = src->funcs->process(adev, src, entry);
	if (r)
	DRM_ERROR("error processing interrupt (%d)\n", r);
	}
	}

	/**
	* amdgpu_irq_update - update hw interrupt state
	*
	* @adev: amdgpu device pointer
	* @src: interrupt src you want to enable
	* @type: type of interrupt you want to update
	*
	* Updates the interrupt state for a specific src (all asics).
	*/
	int amdgpu_irq_update(struct amdgpu_device *adev,
	struct amdgpu_irq_src *src, unsigned type)
	{
	unsigned long irqflags;
	enum amdgpu_interrupt_state state;
	int r;

	spin_lock_irqsave(&adev->irq.lock, irqflags);

	/* we need to determine after taking the lock, otherwise
	we might disable just enabled interrupts again */
	if (amdgpu_irq_enabled(adev, src, type))
	state = AMDGPU_IRQ_STATE_ENABLE;
	else
	state = AMDGPU_IRQ_STATE_DISABLE;

	r = src->funcs->set(adev, src, type, state);
	spin_unlock_irqrestore(&adev->irq.lock, irqflags);
	return r;
	}

	void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
	{
	int i, j, k;

	for (i = 0; i < AMDGPU_IH_CLIENTID_MAX; ++i) {
	if (!adev->irq.client[i].sources)
	continue;

	for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
	struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];

	if (!src)
	continue;
	for (k = 0; k < src->num_types; k++)
	amdgpu_irq_update(adev, src, k);
	}
	}
	}

	/**
	* amdgpu_irq_get - enable interrupt
	*
	* @adev: amdgpu device pointer
	* @src: interrupt src you want to enable
	* @type: type of interrupt you want to enable
	*
	* Enables the interrupt type for a specific src (all asics).
	*/
	int amdgpu_irq_get(struct amdgpu_device adev, struct amdgpu_irq_src src,
	unsigned type)
	{
	if (!adev->ddev->irq_enabled)
	return -ENOENT;

	if (type >= src->num_types)
	return -EINVAL;

	if (!src->enabled_types \|\| !src->funcs->set)
	return -EINVAL;

	if (atomic_inc_return(&src->enabled_types[type]) == 1)
	return amdgpu_irq_update(adev, src, type);

	return 0;
	}

	/**
	* amdgpu_irq_put - disable interrupt
	*
	* @adev: amdgpu device pointer
	* @src: interrupt src you want to disable
	* @type: type of interrupt you want to disable
	*
	* Disables the interrupt type for a specific src (all asics).
	*/
	int amdgpu_irq_put(struct amdgpu_device adev, struct amdgpu_irq_src src,
	unsigned type)
	{
	if (!adev->ddev->irq_enabled)
	return -ENOENT;

	if (type >= src->num_types)
	return -EINVAL;

	if (!src->enabled_types \|\| !src->funcs->set)
	return -EINVAL;

	if (atomic_dec_and_test(&src->enabled_types[type]))
	return amdgpu_irq_update(adev, src, type);

	return 0;
	}

	/**
	* amdgpu_irq_enabled - test if irq is enabled or not
	*
	* @adev: amdgpu device pointer
	* @idx: interrupt src you want to test
	*
	* Tests if the given interrupt source is enabled or not
	*/
	bool amdgpu_irq_enabled(struct amdgpu_device adev, struct amdgpu_irq_src src,
	unsigned type)
	{
	if (!adev->ddev->irq_enabled)
	return false;

	if (type >= src->num_types)
	return false;

	if (!src->enabled_types \|\| !src->funcs->set)
	return false;

	return !!atomic_read(&src->enabled_types[type]);
	}

	/* gen irq */
	static void amdgpu_irq_mask(struct irq_data *irqd)
	{
	/* XXX */
	}

	static void amdgpu_irq_unmask(struct irq_data *irqd)
	{
	/* XXX */
	}

	static struct irq_chip amdgpu_irq_chip = {
	.name = "amdgpu-ih",
	.irq_mask = amdgpu_irq_mask,
	.irq_unmask = amdgpu_irq_unmask,
	};

	static int amdgpu_irqdomain_map(struct irq_domain *d,
	unsigned int irq, irq_hw_number_t hwirq)
	{
	if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
	return -EPERM;

	irq_set_chip_and_handler(irq,
	&amdgpu_irq_chip, handle_simple_irq);
	return 0;
	}

	static const struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
	.map = amdgpu_irqdomain_map,
	};

	/**
	* amdgpu_irq_add_domain - create a linear irq domain
	*
	* @adev: amdgpu device pointer
	*
	* Create an irq domain for GPU interrupt sources
	* that may be driven by another driver (e.g., ACP).
	*/
	int amdgpu_irq_add_domain(struct amdgpu_device *adev)
	{
	adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
	&amdgpu_hw_irqdomain_ops, adev);
	if (!adev->irq.domain) {
	DRM_ERROR("GPU irq add domain failed\n");
	return -ENODEV;
	}

	return 0;
	}

	/**
	* amdgpu_irq_remove_domain - remove the irq domain
	*
	* @adev: amdgpu device pointer
	*
	* Remove the irq domain for GPU interrupt sources
	* that may be driven by another driver (e.g., ACP).
	*/
	void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
	{
	if (adev->irq.domain) {
	irq_domain_remove(adev->irq.domain);
	adev->irq.domain = NULL;
	}
	}

	/**
	* amdgpu_irq_create_mapping - create a mapping between a domain irq and a
	* Linux irq
	*
	* @adev: amdgpu device pointer
	* @src_id: IH source id
	*
	* Create a mapping between a domain irq (GPU IH src id) and a Linux irq
	* Use this for components that generate a GPU interrupt, but are driven
	* by a different driver (e.g., ACP).
	* Returns the Linux irq.
	*/
	unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id)
	{
	adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);

	return adev->irq.virq[src_id];
	}