// SPDX-License-Identifier: MIT/* * Copyright 2015 Advanced Micro Devices, Inc. * * 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: AMD * */ #include "dm_services_types.h"#include "dc.h" #include "amdgpu.h"#include "amdgpu_dm.h"#include "amdgpu_dm_irq.h" /** * DOC: overview * * DM provides another layer of IRQ management on top of what the base driver * already provides. This is something that could be cleaned up, and is a * future TODO item. * * The base driver provides IRQ source registration with DRM, handler * registration into the base driver's IRQ table, and a handler callback * amdgpu_irq_handler(), with which DRM calls on interrupts. This generic * handler looks up the IRQ table, and calls the respective * &amdgpu_irq_src_funcs.process hookups. * * What DM provides on top are two IRQ tables specifically for top-half and * bottom-half IRQ handling, with the bottom-half implementing workqueues: * * - &amdgpu_display_manager.irq_handler_list_high_tab * - &amdgpu_display_manager.irq_handler_list_low_tab * * They override the base driver's IRQ table, and the effect can be seen * in the hooks that DM provides for &amdgpu_irq_src_funcs.process. They * are all set to the DM generic handler amdgpu_dm_irq_handler(), which looks up * DM's IRQ tables. However, in order for base driver to recognize this hook, DM * still needs to register the IRQ with the base driver. See * dce110_register_irq_handlers() and dcn10_register_irq_handlers(). * * To expose DC's hardware interrupt toggle to the base driver, DM implements * &amdgpu_irq_src_funcs.set hooks. Base driver calls it through * amdgpu_irq_update() to enable or disable the interrupt. */ /****************************************************************************** * Private declarations. *****************************************************************************/ /** * struct amdgpu_dm_irq_handler_data - Data for DM interrupt handlers. * * @list: Linked list entry referencing the next/previous handler * @handler: Handler function * @handler_arg: Argument passed to the handler when triggered * @dm: DM which this handler belongs to * @irq_source: DC interrupt source that this handler is registered for * @work: work struct */struct amdgpu_dm_irq_handler_data {	struct list_head list;	interrupt_handler handler;	void *handler_arg; 	struct amdgpu_display_manager *dm;	/* DAL irq source which registered for this interrupt. */	enum dc_irq_source irq_source;	struct work_struct work;}; #define DM_IRQ_TABLE_LOCK(adev, flags) \	spin_lock_irqsave(&adev->dm.irq_handler_list_table_lock, flags) #define DM_IRQ_TABLE_UNLOCK(adev, flags) \	spin_unlock_irqrestore(&adev->dm.irq_handler_list_table_lock, flags) /****************************************************************************** * Private functions. *****************************************************************************/ static void init_handler_common_data(struct amdgpu_dm_irq_handler_data *hcd,				     void (*ih)(void *),				     void *args,				     struct amdgpu_display_manager *dm){	hcd->handler = ih;	hcd->handler_arg = args;	hcd->dm = dm;} /** * dm_irq_work_func() - Handle an IRQ outside of the interrupt handler proper. * * @work: work struct */static void dm_irq_work_func(struct work_struct *work){	struct amdgpu_dm_irq_handler_data *handler_data =		container_of(work, struct amdgpu_dm_irq_handler_data, work); 	handler_data->handler(handler_data->handler_arg); 	/* Call a DAL subcomponent which registered for interrupt notification	 * at INTERRUPT_LOW_IRQ_CONTEXT.	 * (The most common use is HPD interrupt)	 */} /* * Remove a handler and return a pointer to handler list from which the * handler was removed. */static struct list_head *remove_irq_handler(struct amdgpu_device *adev,					    void *ih,					    const struct dc_interrupt_params *int_params){	struct list_head *hnd_list;	struct list_head *entry, *tmp;	struct amdgpu_dm_irq_handler_data *handler;	unsigned long irq_table_flags;	bool handler_removed = false;	enum dc_irq_source irq_source; 	DM_IRQ_TABLE_LOCK(adev, irq_table_flags); 	irq_source = int_params->irq_source; 	switch (int_params->int_context) {	case INTERRUPT_HIGH_IRQ_CONTEXT:		hnd_list = &adev->dm.irq_handler_list_high_tab[irq_source];		break;	case INTERRUPT_LOW_IRQ_CONTEXT:	default:		hnd_list = &adev->dm.irq_handler_list_low_tab[irq_source];		break;	} 	list_for_each_safe(entry, tmp, hnd_list) { 		handler = list_entry(entry, struct amdgpu_dm_irq_handler_data,				     list); 		if (handler == NULL)			continue; 		if (ih == handler->handler) {			/* Found our handler. Remove it from the list. */			list_del(&handler->list);			handler_removed = true;			break;		}	} 	DM_IRQ_TABLE_UNLOCK(adev, irq_table_flags); 	if (handler_removed == false) {		/* Not necessarily an error - caller may not		 * know the context.		 */		return NULL;	} 	kfree(handler); 	DRM_DEBUG_KMS(	"DM_IRQ: removed irq handler: %p for: dal_src=%d, irq context=%d\n",		ih, int_params->irq_source, int_params->int_context); 	return hnd_list;} /** * unregister_all_irq_handlers() - Cleans up handlers from the DM IRQ table * @adev: The base driver device containing the DM device * * Go through low and high context IRQ tables and deallocate handlers. */static void unregister_all_irq_handlers(struct amdgpu_device *adev){	struct list_head *hnd_list_low;	struct list_head *hnd_list_high;	struct list_head *entry, *tmp;	struct amdgpu_dm_irq_handler_data *handler;	unsigned long irq_table_flags;	int i; 	DM_IRQ_TABLE_LOCK(adev, irq_table_flags); 	for (i = 0; i < DAL_IRQ_SOURCES_NUMBER; i++) {		hnd_list_low = &adev->dm.irq_handler_list_low_tab[i];		hnd_list_high = &adev->dm.irq_handler_list_high_tab[i]; 		list_for_each_safe(entry, tmp, hnd_list_low) { 			handler = list_entry(entry, struct amdgpu_dm_irq_handler_data,					     list); 			if (handler == NULL || handler->handler == NULL)				continue; 			list_del(&handler->list);			kfree(handler);		} 		list_for_each_safe(entry, tmp, hnd_list_high) { 			handler = list_entry(entry, struct amdgpu_dm_irq_handler_data,					     list); 			if (handler == NULL || handler->handler == NULL)				continue; 			list_del(&handler->list);			kfree(handler);		}	} 	DM_IRQ_TABLE_UNLOCK(adev, irq_table_flags);} static boolvalidate_irq_registration_params(struct dc_interrupt_params *int_params,				 void (*ih)(void *)){	if (NULL == int_params || NULL == ih) {		DRM_ERROR("DM_IRQ: invalid input!\n");		return false;	} 	if (int_params->int_context >= INTERRUPT_CONTEXT_NUMBER) {		DRM_ERROR("DM_IRQ: invalid context: %d!\n",				int_params->int_context);		return false;	} 	if (!DAL_VALID_IRQ_SRC_NUM(int_params->irq_source)) {		DRM_ERROR("DM_IRQ: invalid irq_source: %d!\n",				int_params->irq_source);		return false;	} 	return true;} static bool validate_irq_unregistration_params(enum dc_irq_source irq_source,					       irq_handler_idx handler_idx){	if (handler_idx == DAL_INVALID_IRQ_HANDLER_IDX) {		DRM_ERROR("DM_IRQ: invalid handler_idx==NULL!\n");		return false;	} 	if (!DAL_VALID_IRQ_SRC_NUM(irq_source)) {		DRM_ERROR("DM_IRQ: invalid irq_source:%d!\n", irq_source);		return false;	} 	return true;}/****************************************************************************** * Public functions. * * Note: caller is responsible for input validation. *****************************************************************************/ /** * amdgpu_dm_irq_register_interrupt() - Register a handler within DM. * @adev: The base driver device containing the DM device. * @int_params: Interrupt parameters containing the source, and handler context * @ih: Function pointer to the interrupt handler to register * @handler_args: Arguments passed to the handler when the interrupt occurs * * Register an interrupt handler for the given IRQ source, under the given * context. The context can either be high or low. High context handlers are * executed directly within ISR context, while low context is executed within a * workqueue, thereby allowing operations that sleep. * * Registered handlers are called in a FIFO manner, i.e. the most recently * registered handler will be called first. * * Return: Handler data &struct amdgpu_dm_irq_handler_data containing the IRQ *         source, handler function, and args */void *amdgpu_dm_irq_register_interrupt(struct amdgpu_device *adev,				       struct dc_interrupt_params *int_params,				       void (*ih)(void *),				       void *handler_args){	struct list_head *hnd_list;	struct amdgpu_dm_irq_handler_data *handler_data;	unsigned long irq_table_flags;	enum dc_irq_source irq_source; 	if (false == validate_irq_registration_params(int_params, ih))		return DAL_INVALID_IRQ_HANDLER_IDX; 	handler_data = kzalloc_obj(*handler_data);	if (!handler_data) {		DRM_ERROR("DM_IRQ: failed to allocate irq handler!\n");		return DAL_INVALID_IRQ_HANDLER_IDX;	} 	init_handler_common_data(handler_data, ih, handler_args, &adev->dm); 	irq_source = int_params->irq_source; 	handler_data->irq_source = irq_source; 	/* Lock the list, add the handler. */	DM_IRQ_TABLE_LOCK(adev, irq_table_flags); 	switch (int_params->int_context) {	case INTERRUPT_HIGH_IRQ_CONTEXT:		hnd_list = &adev->dm.irq_handler_list_high_tab[irq_source];		break;	case INTERRUPT_LOW_IRQ_CONTEXT:	default:		hnd_list = &adev->dm.irq_handler_list_low_tab[irq_source];		INIT_WORK(&handler_data->work, dm_irq_work_func);		break;	} 	list_add_tail(&handler_data->list, hnd_list); 	DM_IRQ_TABLE_UNLOCK(adev, irq_table_flags); 	/* This pointer will be stored by code which requested interrupt	 * registration.	 * The same pointer will be needed in order to unregister the	 * interrupt.	 */ 	DRM_DEBUG_KMS(		"DM_IRQ: added irq handler: %p for: dal_src=%d, irq context=%d\n",		handler_data,		irq_source,		int_params->int_context); 	return handler_data;} /** * amdgpu_dm_irq_unregister_interrupt() - Remove a handler from the DM IRQ table * @adev: The base driver device containing the DM device * @irq_source: IRQ source to remove the given handler from * @ih: Function pointer to the interrupt handler to unregister * * Go through both low and high context IRQ tables, and find the given handler * for the given irq source. If found, remove it. Otherwise, do nothing. */void amdgpu_dm_irq_unregister_interrupt(struct amdgpu_device *adev,					enum dc_irq_source irq_source,					void *ih){	struct list_head *handler_list;	struct dc_interrupt_params int_params;	int i; 	if (false == validate_irq_unregistration_params(irq_source, ih))		return; 	memset(&int_params, 0, sizeof(int_params)); 	int_params.irq_source = irq_source; 	for (i = 0; i < INTERRUPT_CONTEXT_NUMBER; i++) { 		int_params.int_context = i; 		handler_list = remove_irq_handler(adev, ih, &int_params); 		if (handler_list != NULL)			break;	} 	if (handler_list == NULL) {		/* If we got here, it means we searched all irq contexts		 * for this irq source, but the handler was not found.		 */		DRM_ERROR(		"DM_IRQ: failed to find irq handler:%p for irq_source:%d!\n",			ih, irq_source);	}} /** * amdgpu_dm_irq_init() - Initialize DM IRQ management * @adev:  The base driver device containing the DM device * * Initialize DM's high and low context IRQ tables. * * The N by M table contains N IRQ sources, with M * &struct amdgpu_dm_irq_handler_data hooked together in a linked list. The * list_heads are initialized here. When an interrupt n is triggered, all m * handlers are called in sequence, FIFO according to registration order. * * The low context table requires special steps to initialize, since handlers * will be deferred to a workqueue. See &struct irq_list_head. */int amdgpu_dm_irq_init(struct amdgpu_device *adev){	int src;	struct list_head *lh; 	DRM_DEBUG_KMS("DM_IRQ\n"); 	spin_lock_init(&adev->dm.irq_handler_list_table_lock); 	for (src = 0; src < DAL_IRQ_SOURCES_NUMBER; src++) {		/* low context handler list init */		lh = &adev->dm.irq_handler_list_low_tab[src];		INIT_LIST_HEAD(lh);		/* high context handler init */		INIT_LIST_HEAD(&adev->dm.irq_handler_list_high_tab[src]);	} 	return 0;} /** * amdgpu_dm_irq_fini() - Tear down DM IRQ management * @adev: The base driver device containing the DM device * * Flush all work within the low context IRQ table. */void amdgpu_dm_irq_fini(struct amdgpu_device *adev){	int src;	struct list_head *lh;	struct list_head *entry, *tmp;	struct amdgpu_dm_irq_handler_data *handler;	unsigned long irq_table_flags; 	DRM_DEBUG_KMS("DM_IRQ: releasing resources.\n");	for (src = 0; src < DAL_IRQ_SOURCES_NUMBER; src++) {		DM_IRQ_TABLE_LOCK(adev, irq_table_flags);		/* The handler was removed from the table,		 * it means it is safe to flush all the 'work'		 * (because no code can schedule a new one).		 */		lh = &adev->dm.irq_handler_list_low_tab[src];		DM_IRQ_TABLE_UNLOCK(adev, irq_table_flags); 		if (!list_empty(lh)) {			list_for_each_safe(entry, tmp, lh) {				handler = list_entry(					entry,					struct amdgpu_dm_irq_handler_data,					list);				flush_work(&handler->work);			}		}	}	/* Deallocate handlers from the table. */	unregister_all_irq_handlers(adev);} void amdgpu_dm_irq_suspend(struct amdgpu_device *adev){	struct drm_device *dev = adev_to_drm(adev);	int src;	struct list_head *hnd_list_h;	struct list_head *hnd_list_l;	unsigned long irq_table_flags;	struct list_head *entry, *tmp;	struct amdgpu_dm_irq_handler_data *handler; 	DM_IRQ_TABLE_LOCK(adev, irq_table_flags); 	DRM_DEBUG_KMS("DM_IRQ: suspend\n"); 	/**	 * Disable HW interrupt  for HPD and HPDRX only since FLIP and VBLANK	 * will be disabled from manage_dm_interrupts on disable CRTC.	 */	for (src = DC_IRQ_SOURCE_HPD1; src <= DC_IRQ_SOURCE_HPD6RX; src++) {		hnd_list_l = &adev->dm.irq_handler_list_low_tab[src];		hnd_list_h = &adev->dm.irq_handler_list_high_tab[src];		if (!list_empty(hnd_list_l) || !list_empty(hnd_list_h))			dc_interrupt_set(adev->dm.dc, src, false); 

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