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fbb60fe35a
Return IRQ_NONE if it was not our irq. This is necessary for the case when qxl is sharing irq line with a device A in a crash kernel. If qxl is initialized before A and A's irq was raised during this gap, returning IRQ_HANDLED in this case will cause this irq to be raised again after EOI since kernel think it was handled but in fact it was not. Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
100 lines
3.3 KiB
C
100 lines
3.3 KiB
C
/*
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* Copyright 2013 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: Dave Airlie
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* Alon Levy
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*/
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#include "qxl_drv.h"
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irqreturn_t qxl_irq_handler(int irq, void *arg)
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{
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struct drm_device *dev = (struct drm_device *) arg;
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struct qxl_device *qdev = (struct qxl_device *)dev->dev_private;
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uint32_t pending;
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pending = xchg(&qdev->ram_header->int_pending, 0);
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if (!pending)
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return IRQ_NONE;
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atomic_inc(&qdev->irq_received);
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if (pending & QXL_INTERRUPT_DISPLAY) {
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atomic_inc(&qdev->irq_received_display);
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wake_up_all(&qdev->display_event);
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qxl_queue_garbage_collect(qdev, false);
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}
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if (pending & QXL_INTERRUPT_CURSOR) {
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atomic_inc(&qdev->irq_received_cursor);
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wake_up_all(&qdev->cursor_event);
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}
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if (pending & QXL_INTERRUPT_IO_CMD) {
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atomic_inc(&qdev->irq_received_io_cmd);
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wake_up_all(&qdev->io_cmd_event);
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}
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if (pending & QXL_INTERRUPT_ERROR) {
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/* TODO: log it, reset device (only way to exit this condition)
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* (do it a certain number of times, afterwards admit defeat,
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* to avoid endless loops).
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*/
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qdev->irq_received_error++;
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qxl_io_log(qdev, "%s: driver is in bug mode.\n", __func__);
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}
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if (pending & QXL_INTERRUPT_CLIENT_MONITORS_CONFIG) {
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qxl_io_log(qdev, "QXL_INTERRUPT_CLIENT_MONITORS_CONFIG\n");
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schedule_work(&qdev->client_monitors_config_work);
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}
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qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
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outb(0, qdev->io_base + QXL_IO_UPDATE_IRQ);
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return IRQ_HANDLED;
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}
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static void qxl_client_monitors_config_work_func(struct work_struct *work)
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{
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struct qxl_device *qdev = container_of(work, struct qxl_device,
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client_monitors_config_work);
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qxl_display_read_client_monitors_config(qdev);
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}
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int qxl_irq_init(struct qxl_device *qdev)
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{
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int ret;
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init_waitqueue_head(&qdev->display_event);
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init_waitqueue_head(&qdev->cursor_event);
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init_waitqueue_head(&qdev->io_cmd_event);
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INIT_WORK(&qdev->client_monitors_config_work,
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qxl_client_monitors_config_work_func);
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atomic_set(&qdev->irq_received, 0);
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atomic_set(&qdev->irq_received_display, 0);
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atomic_set(&qdev->irq_received_cursor, 0);
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atomic_set(&qdev->irq_received_io_cmd, 0);
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qdev->irq_received_error = 0;
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ret = drm_irq_install(qdev->ddev, qdev->ddev->pdev->irq);
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qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
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if (unlikely(ret != 0)) {
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DRM_ERROR("Failed installing irq: %d\n", ret);
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return 1;
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}
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return 0;
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}
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