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      1 /*	$NetBSD: qxl_irq.c,v 1.4 2021/12/18 23:45:42 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2013 Red Hat Inc.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     22  * OTHER DEALINGS IN THE SOFTWARE.
     23  *
     24  * Authors: Dave Airlie
     25  *          Alon Levy
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 __KERNEL_RCSID(0, "$NetBSD: qxl_irq.c,v 1.4 2021/12/18 23:45:42 riastradh Exp $");
     30 
     31 #include <linux/pci.h>
     32 
     33 #include <drm/drm_irq.h>
     34 
     35 #include "qxl_drv.h"
     36 
     37 irqreturn_t qxl_irq_handler(int irq, void *arg)
     38 {
     39 	struct drm_device *dev = (struct drm_device *) arg;
     40 	struct qxl_device *qdev = (struct qxl_device *)dev->dev_private;
     41 	uint32_t pending;
     42 
     43 	pending = xchg(&qdev->ram_header->int_pending, 0);
     44 
     45 	if (!pending)
     46 		return IRQ_NONE;
     47 
     48 	atomic_inc(&qdev->irq_received);
     49 
     50 	if (pending & QXL_INTERRUPT_DISPLAY) {
     51 		atomic_inc(&qdev->irq_received_display);
     52 		wake_up_all(&qdev->display_event);
     53 		qxl_queue_garbage_collect(qdev, false);
     54 	}
     55 	if (pending & QXL_INTERRUPT_CURSOR) {
     56 		atomic_inc(&qdev->irq_received_cursor);
     57 		wake_up_all(&qdev->cursor_event);
     58 	}
     59 	if (pending & QXL_INTERRUPT_IO_CMD) {
     60 		atomic_inc(&qdev->irq_received_io_cmd);
     61 		wake_up_all(&qdev->io_cmd_event);
     62 	}
     63 	if (pending & QXL_INTERRUPT_ERROR) {
     64 		/* TODO: log it, reset device (only way to exit this condition)
     65 		 * (do it a certain number of times, afterwards admit defeat,
     66 		 * to avoid endless loops).
     67 		 */
     68 		qdev->irq_received_error++;
     69 		DRM_WARN("driver is in bug mode\n");
     70 	}
     71 	if (pending & QXL_INTERRUPT_CLIENT_MONITORS_CONFIG) {
     72 		schedule_work(&qdev->client_monitors_config_work);
     73 	}
     74 	qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
     75 	outb(0, qdev->io_base + QXL_IO_UPDATE_IRQ);
     76 	return IRQ_HANDLED;
     77 }
     78 
     79 static void qxl_client_monitors_config_work_func(struct work_struct *work)
     80 {
     81 	struct qxl_device *qdev = container_of(work, struct qxl_device,
     82 					       client_monitors_config_work);
     83 
     84 	qxl_display_read_client_monitors_config(qdev);
     85 }
     86 
     87 int qxl_irq_init(struct qxl_device *qdev)
     88 {
     89 	int ret;
     90 
     91 	init_waitqueue_head(&qdev->display_event);
     92 	init_waitqueue_head(&qdev->cursor_event);
     93 	init_waitqueue_head(&qdev->io_cmd_event);
     94 	INIT_WORK(&qdev->client_monitors_config_work,
     95 		  qxl_client_monitors_config_work_func);
     96 	atomic_set(&qdev->irq_received, 0);
     97 	atomic_set(&qdev->irq_received_display, 0);
     98 	atomic_set(&qdev->irq_received_cursor, 0);
     99 	atomic_set(&qdev->irq_received_io_cmd, 0);
    100 	qdev->irq_received_error = 0;
    101 #ifdef __NetBSD__
    102 	ret = drm_irq_install(qdev->ddev);
    103 #else
    104 	ret = drm_irq_install(&qdev->ddev, qdev->ddev.pdev->irq);
    105 #endif
    106 	qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
    107 	if (unlikely(ret != 0)) {
    108 		DRM_ERROR("Failed installing irq: %d\n", ret);
    109 		return 1;
    110 	}
    111 	return 0;
    112 }
    113