qxl_irq.c

  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 <linux/pci.h>
 27
 28#include <drm/drm_drv.h>
 29#include <drm/drm_print.h>
 30
 31#include "qxl_drv.h"
 32
 33static irqreturn_t qxl_irq_handler(int irq, void *arg)
 34{
 35	struct drm_device *dev = (struct drm_device *) arg;
 36	struct qxl_device *qdev = to_qxl(dev);
 37	uint32_t pending;
 38
 39	pending = xchg(&qdev->ram_header->int_pending, 0);
 40
 41	if (!pending)
 42		return IRQ_NONE;
 43
 44	atomic_inc(&qdev->irq_received);
 45
 46	if (pending & QXL_INTERRUPT_DISPLAY) {
 47		atomic_inc(&qdev->irq_received_display);
 48		wake_up_all(&qdev->display_event);
 49		qxl_queue_garbage_collect(qdev, false);
 50	}
 51	if (pending & QXL_INTERRUPT_CURSOR) {
 52		atomic_inc(&qdev->irq_received_cursor);
 53		wake_up_all(&qdev->cursor_event);
 54	}
 55	if (pending & QXL_INTERRUPT_IO_CMD) {
 56		atomic_inc(&qdev->irq_received_io_cmd);
 57		wake_up_all(&qdev->io_cmd_event);
 58	}
 59	if (pending & QXL_INTERRUPT_ERROR) {
 60		/* TODO: log it, reset device (only way to exit this condition)
 61		 * (do it a certain number of times, afterwards admit defeat,
 62		 * to avoid endless loops).
 63		 */
 64		qdev->irq_received_error++;
 65		DRM_WARN("driver is in bug mode\n");
 66	}
 67	if (pending & QXL_INTERRUPT_CLIENT_MONITORS_CONFIG) {
 68		schedule_work(&qdev->client_monitors_config_work);
 69	}
 70	qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
 71	outb(0, qdev->io_base + QXL_IO_UPDATE_IRQ);
 72	return IRQ_HANDLED;
 73}
 74
 75static void qxl_client_monitors_config_work_func(struct work_struct *work)
 76{
 77	struct qxl_device *qdev = container_of(work, struct qxl_device,
 78					       client_monitors_config_work);
 79
 80	qxl_display_read_client_monitors_config(qdev);
 81}
 82
 83int qxl_irq_init(struct qxl_device *qdev)
 84{
 85	struct drm_device *ddev = &qdev->ddev;
 86	struct pci_dev *pdev = to_pci_dev(ddev->dev);
 87	int ret;
 88
 89	init_waitqueue_head(&qdev->display_event);
 90	init_waitqueue_head(&qdev->cursor_event);
 91	init_waitqueue_head(&qdev->io_cmd_event);
 92	init_waitqueue_head(&qdev->release_event);
 93	INIT_WORK(&qdev->client_monitors_config_work,
 94		  qxl_client_monitors_config_work_func);
 95	atomic_set(&qdev->irq_received, 0);
 96	atomic_set(&qdev->irq_received_display, 0);
 97	atomic_set(&qdev->irq_received_cursor, 0);
 98	atomic_set(&qdev->irq_received_io_cmd, 0);
 99	qdev->irq_received_error = 0;
100	ret = request_irq(pdev->irq, qxl_irq_handler, IRQF_SHARED, ddev->driver->name, ddev);
101	qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
102	if (unlikely(ret != 0)) {
103		DRM_ERROR("Failed installing irq: %d\n", ret);
104		return 1;
105	}
106	return 0;
107}