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qxl_irq.c revision 1.1.1.1.6.2 
      1 /*
      2  * Copyright 2013 Red Hat Inc.
      3  *
      4  * Permission is hereby granted, free of charge, to any person obtaining a
      5  * copy of this software and associated documentation files (the "Software"),
      6  * to deal in the Software without restriction, including without limitation
      7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8  * and/or sell copies of the Software, and to permit persons to whom the
      9  * Software is furnished to do so, subject to the following conditions:
     10  *
     11  * The above copyright notice and this permission notice shall be included in
     12  * all copies or substantial portions of the Software.
     13  *
     14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     20  * OTHER DEALINGS IN THE SOFTWARE.
     21  *
     22  * Authors: Dave Airlie
     23  *          Alon Levy
     24  */
     25 
     26 #include "qxl_drv.h"
     27 
     28 irqreturn_t qxl_irq_handler(int irq, void *arg)
     29 {
     30 	struct drm_device *dev = (struct drm_device *) arg;
     31 	struct qxl_device *qdev = (struct qxl_device *)dev->dev_private;
     32 	uint32_t pending;
     33 
     34 	pending = xchg(&qdev->ram_header->int_pending, 0);
     35 
     36 	atomic_inc(&qdev->irq_received);
     37 
     38 	if (pending & QXL_INTERRUPT_DISPLAY) {
     39 		atomic_inc(&qdev->irq_received_display);
     40 		wake_up_all(&qdev->display_event);
     41 		qxl_queue_garbage_collect(qdev, false);
     42 	}
     43 	if (pending & QXL_INTERRUPT_CURSOR) {
     44 		atomic_inc(&qdev->irq_received_cursor);
     45 		wake_up_all(&qdev->cursor_event);
     46 	}
     47 	if (pending & QXL_INTERRUPT_IO_CMD) {
     48 		atomic_inc(&qdev->irq_received_io_cmd);
     49 		wake_up_all(&qdev->io_cmd_event);
     50 	}
     51 	if (pending & QXL_INTERRUPT_ERROR) {
     52 		/* TODO: log it, reset device (only way to exit this condition)
     53 		 * (do it a certain number of times, afterwards admit defeat,
     54 		 * to avoid endless loops).
     55 		 */
     56 		qdev->irq_received_error++;
     57 		qxl_io_log(qdev, "%s: driver is in bug mode.\n", __func__);
     58 	}
     59 	if (pending & QXL_INTERRUPT_CLIENT_MONITORS_CONFIG) {
     60 		qxl_io_log(qdev, "QXL_INTERRUPT_CLIENT_MONITORS_CONFIG\n");
     61 		schedule_work(&qdev->client_monitors_config_work);
     62 	}
     63 	qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
     64 	outb(0, qdev->io_base + QXL_IO_UPDATE_IRQ);
     65 	return IRQ_HANDLED;
     66 }
     67 
     68 static void qxl_client_monitors_config_work_func(struct work_struct *work)
     69 {
     70 	struct qxl_device *qdev = container_of(work, struct qxl_device,
     71 					       client_monitors_config_work);
     72 
     73 	qxl_display_read_client_monitors_config(qdev);
     74 }
     75 
     76 int qxl_irq_init(struct qxl_device *qdev)
     77 {
     78 	int ret;
     79 
     80 	init_waitqueue_head(&qdev->display_event);
     81 	init_waitqueue_head(&qdev->cursor_event);
     82 	init_waitqueue_head(&qdev->io_cmd_event);
     83 	INIT_WORK(&qdev->client_monitors_config_work,
     84 		  qxl_client_monitors_config_work_func);
     85 	atomic_set(&qdev->irq_received, 0);
     86 	atomic_set(&qdev->irq_received_display, 0);
     87 	atomic_set(&qdev->irq_received_cursor, 0);
     88 	atomic_set(&qdev->irq_received_io_cmd, 0);
     89 	qdev->irq_received_error = 0;
     90 	ret = drm_irq_install(qdev->ddev);
     91 	qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
     92 	if (unlikely(ret != 0)) {
     93 		DRM_ERROR("Failed installing irq: %d\n", ret);
     94 		return 1;
     95 	}
     96 	return 0;
     97 }
     98