Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / gpu / drm / qxl / qxl_irq.c

diff --git a/kernel/drivers/gpu/drm/qxl/qxl_irq.c b/kernel/drivers/gpu/drm/qxl/qxl_irq.c
new file mode 100644 (file)
index 0000000..0bf1e20
--- /dev/null
+++ b/kernel/drivers/gpu/drm/qxl/qxl_irq.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright 2013 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Dave Airlie
+ *          Alon Levy
+ */
+
+#include "qxl_drv.h"
+
+irqreturn_t qxl_irq_handler(int irq, void *arg)
+{
+       struct drm_device *dev = (struct drm_device *) arg;
+       struct qxl_device *qdev = (struct qxl_device *)dev->dev_private;
+       uint32_t pending;
+
+       pending = xchg(&qdev->ram_header->int_pending, 0);
+
+       if (!pending)
+               return IRQ_NONE;
+
+       atomic_inc(&qdev->irq_received);
+
+       if (pending & QXL_INTERRUPT_DISPLAY) {
+               atomic_inc(&qdev->irq_received_display);
+               wake_up_all(&qdev->display_event);
+               qxl_queue_garbage_collect(qdev, false);
+       }
+       if (pending & QXL_INTERRUPT_CURSOR) {
+               atomic_inc(&qdev->irq_received_cursor);
+               wake_up_all(&qdev->cursor_event);
+       }
+       if (pending & QXL_INTERRUPT_IO_CMD) {
+               atomic_inc(&qdev->irq_received_io_cmd);
+               wake_up_all(&qdev->io_cmd_event);
+       }
+       if (pending & QXL_INTERRUPT_ERROR) {
+               /* TODO: log it, reset device (only way to exit this condition)
+                * (do it a certain number of times, afterwards admit defeat,
+                * to avoid endless loops).
+                */
+               qdev->irq_received_error++;
+               qxl_io_log(qdev, "%s: driver is in bug mode.\n", __func__);
+       }
+       if (pending & QXL_INTERRUPT_CLIENT_MONITORS_CONFIG) {
+               qxl_io_log(qdev, "QXL_INTERRUPT_CLIENT_MONITORS_CONFIG\n");
+               schedule_work(&qdev->client_monitors_config_work);
+       }
+       qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
+       outb(0, qdev->io_base + QXL_IO_UPDATE_IRQ);
+       return IRQ_HANDLED;
+}
+
+static void qxl_client_monitors_config_work_func(struct work_struct *work)
+{
+       struct qxl_device *qdev = container_of(work, struct qxl_device,
+                                              client_monitors_config_work);
+
+       qxl_display_read_client_monitors_config(qdev);
+}
+
+int qxl_irq_init(struct qxl_device *qdev)
+{
+       int ret;
+
+       init_waitqueue_head(&qdev->display_event);
+       init_waitqueue_head(&qdev->cursor_event);
+       init_waitqueue_head(&qdev->io_cmd_event);
+       INIT_WORK(&qdev->client_monitors_config_work,
+                 qxl_client_monitors_config_work_func);
+       atomic_set(&qdev->irq_received, 0);
+       atomic_set(&qdev->irq_received_display, 0);
+       atomic_set(&qdev->irq_received_cursor, 0);
+       atomic_set(&qdev->irq_received_io_cmd, 0);
+       qdev->irq_received_error = 0;
+       ret = drm_irq_install(qdev->ddev, qdev->ddev->pdev->irq);
+       qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
+       if (unlikely(ret != 0)) {
+               DRM_ERROR("Failed installing irq: %d\n", ret);
+               return 1;
+       }
+       return 0;
+}