drm/qxl/qxl_irq.c

0001 /*
0002  * Copyright 2013 Red Hat Inc.
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice shall be included in
0012  * all copies or substantial portions of the Software.
0013  *
0014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0017  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0018  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0020  * OTHER DEALINGS IN THE SOFTWARE.
0021  *
0022  * Authors: Dave Airlie
0023  *          Alon Levy
0024  */
0025
0026 #include <linux/pci.h>
0027
0028 #include <drm/drm_drv.h>
0029
0030 #include "qxl_drv.h"
0031
0032 static irqreturn_t qxl_irq_handler(int irq, void *arg)
0033 {
0034     struct drm_device *dev = (struct drm_device *) arg;
0035     struct qxl_device *qdev = to_qxl(dev);
0036     uint32_t pending;
0037
0038     pending = xchg(&qdev->ram_header->int_pending, 0);
0039
0040     if (!pending)
0041         return IRQ_NONE;
0042
0043     atomic_inc(&qdev->irq_received);
0044
0045     if (pending & QXL_INTERRUPT_DISPLAY) {
0046         atomic_inc(&qdev->irq_received_display);
0047         wake_up_all(&qdev->display_event);
0048         qxl_queue_garbage_collect(qdev, false);
0049     }
0050     if (pending & QXL_INTERRUPT_CURSOR) {
0051         atomic_inc(&qdev->irq_received_cursor);
0052         wake_up_all(&qdev->cursor_event);
0053     }
0054     if (pending & QXL_INTERRUPT_IO_CMD) {
0055         atomic_inc(&qdev->irq_received_io_cmd);
0056         wake_up_all(&qdev->io_cmd_event);
0057     }
0058     if (pending & QXL_INTERRUPT_ERROR) {
0059         /* TODO: log it, reset device (only way to exit this condition)
0060          * (do it a certain number of times, afterwards admit defeat,
0061          * to avoid endless loops).
0062          */
0063         qdev->irq_received_error++;
0064         DRM_WARN("driver is in bug mode\n");
0065     }
0066     if (pending & QXL_INTERRUPT_CLIENT_MONITORS_CONFIG) {
0067         schedule_work(&qdev->client_monitors_config_work);
0068     }
0069     qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
0070     outb(0, qdev->io_base + QXL_IO_UPDATE_IRQ);
0071     return IRQ_HANDLED;
0072 }
0073
0074 static void qxl_client_monitors_config_work_func(struct work_struct *work)
0075 {
0076     struct qxl_device *qdev = container_of(work, struct qxl_device,
0077                            client_monitors_config_work);
0078
0079     qxl_display_read_client_monitors_config(qdev);
0080 }
0081
0082 int qxl_irq_init(struct qxl_device *qdev)
0083 {
0084     struct drm_device *ddev = &qdev->ddev;
0085     struct pci_dev *pdev = to_pci_dev(ddev->dev);
0086     int ret;
0087
0088     init_waitqueue_head(&qdev->display_event);
0089     init_waitqueue_head(&qdev->cursor_event);
0090     init_waitqueue_head(&qdev->io_cmd_event);
0091     init_waitqueue_head(&qdev->release_event);
0092     INIT_WORK(&qdev->client_monitors_config_work,
0093           qxl_client_monitors_config_work_func);
0094     atomic_set(&qdev->irq_received, 0);
0095     atomic_set(&qdev->irq_received_display, 0);
0096     atomic_set(&qdev->irq_received_cursor, 0);
0097     atomic_set(&qdev->irq_received_io_cmd, 0);
0098     qdev->irq_received_error = 0;
0099     ret = request_irq(pdev->irq, qxl_irq_handler, IRQF_SHARED, ddev->driver->name, ddev);
0100     qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
0101     if (unlikely(ret != 0)) {
0102         DRM_ERROR("Failed installing irq: %d\n", ret);
0103         return 1;
0104     }
0105     return 0;
0106 }