Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 261 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
new file mode 100644
index 000000000..3b04c2510
--- /dev/null
+++ b/drivers/gpu/drm/drm_irq.c
@@ -0,0 +1,261 @@
+/*
+ * drm_irq.c IRQ and vblank support
+ *
+ * \author Rickard E. (Rik) Faith <faith@valinux.com>
+ * \author Gareth Hughes <gareth@valinux.com>
+ *
+ * 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 (including the next
+ * paragraph) 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
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS 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.
+ */
+
+/*
+ * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
+ *
+ * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
+ * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
+ * All Rights Reserved.
+ *
+ * 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 (including the next
+ * paragraph) 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
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS 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.
+ */
+
+#include <drm/drm_irq.h>
+#include <drm/drmP.h>
+
+#include <linux/interrupt.h>	/* For task queue support */
+
+#include <linux/vgaarb.h>
+#include <linux/export.h>
+
+#include "drm_internal.h"
+
+/**
+ * DOC: irq helpers
+ *
+ * The DRM core provides very simple support helpers to enable IRQ handling on a
+ * device through the drm_irq_install() and drm_irq_uninstall() functions. This
+ * only supports devices with a single interrupt on the main device stored in
+ * &drm_device.dev and set as the device paramter in drm_dev_alloc().
+ *
+ * These IRQ helpers are strictly optional. Drivers which roll their own only
+ * need to set &drm_device.irq_enabled to signal the DRM core that vblank
+ * interrupts are working. Since these helpers don't automatically clean up the
+ * requested interrupt like e.g. devm_request_irq() they're not really
+ * recommended.
+ */
+
+/**
+ * drm_irq_install - install IRQ handler
+ * @dev: DRM device
+ * @irq: IRQ number to install the handler for
+ *
+ * Initializes the IRQ related data. Installs the handler, calling the driver
+ * &drm_driver.irq_preinstall and &drm_driver.irq_postinstall functions before
+ * and after the installation.
+ *
+ * This is the simplified helper interface provided for drivers with no special
+ * needs. Drivers which need to install interrupt handlers for multiple
+ * interrupts must instead set &drm_device.irq_enabled to signal the DRM core
+ * that vblank interrupts are available.
+ *
+ * @irq must match the interrupt number that would be passed to request_irq(),
+ * if called directly instead of using this helper function.
+ *
+ * &drm_driver.irq_handler is called to handle the registered interrupt.
+ *
+ * Returns:
+ * Zero on success or a negative error code on failure.
+ */
+int drm_irq_install(struct drm_device *dev, int irq)
+{
+	int ret;
+	unsigned long sh_flags = 0;
+
+	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
+		return -EINVAL;
+
+	if (irq == 0)
+		return -EINVAL;
+
+	/* Driver must have been initialized */
+	if (!dev->dev_private)
+		return -EINVAL;
+
+	if (dev->irq_enabled)
+		return -EBUSY;
+	dev->irq_enabled = true;
+
+	DRM_DEBUG("irq=%d\n", irq);
+
+	/* Before installing handler */
+	if (dev->driver->irq_preinstall)
+		dev->driver->irq_preinstall(dev);
+
+	/* Install handler */
+	if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
+		sh_flags = IRQF_SHARED;
+
+	ret = request_irq(irq, dev->driver->irq_handler,
+			  sh_flags, dev->driver->name, dev);
+
+	if (ret < 0) {
+		dev->irq_enabled = false;
+		return ret;
+	}
+
+	/* After installing handler */
+	if (dev->driver->irq_postinstall)
+		ret = dev->driver->irq_postinstall(dev);
+
+	if (ret < 0) {
+		dev->irq_enabled = false;
+		if (drm_core_check_feature(dev, DRIVER_LEGACY))
+			vga_client_register(dev->pdev, NULL, NULL, NULL);
+		free_irq(irq, dev);
+	} else {
+		dev->irq = irq;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL(drm_irq_install);
+
+/**
+ * drm_irq_uninstall - uninstall the IRQ handler
+ * @dev: DRM device
+ *
+ * Calls the driver's &drm_driver.irq_uninstall function and unregisters the IRQ
+ * handler.  This should only be called by drivers which used drm_irq_install()
+ * to set up their interrupt handler. Other drivers must only reset
+ * &drm_device.irq_enabled to false.
+ *
+ * Note that for kernel modesetting drivers it is a bug if this function fails.
+ * The sanity checks are only to catch buggy user modesetting drivers which call
+ * the same function through an ioctl.
+ *
+ * Returns:
+ * Zero on success or a negative error code on failure.
+ */
+int drm_irq_uninstall(struct drm_device *dev)
+{
+	unsigned long irqflags;
+	bool irq_enabled;
+	int i;
+
+	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
+		return -EINVAL;
+
+	irq_enabled = dev->irq_enabled;
+	dev->irq_enabled = false;
+
+	/*
+	 * Wake up any waiters so they don't hang. This is just to paper over
+	 * issues for UMS drivers which aren't in full control of their
+	 * vblank/irq handling. KMS drivers must ensure that vblanks are all
+	 * disabled when uninstalling the irq handler.
+	 */
+	if (dev->num_crtcs) {
+		spin_lock_irqsave(&dev->vbl_lock, irqflags);
+		for (i = 0; i < dev->num_crtcs; i++) {
+			struct drm_vblank_crtc *vblank = &dev->vblank[i];
+
+			if (!vblank->enabled)
+				continue;
+
+			WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET));
+
+			drm_vblank_disable_and_save(dev, i);
+			wake_up(&vblank->queue);
+		}
+		spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
+	}
+
+	if (!irq_enabled)
+		return -EINVAL;
+
+	DRM_DEBUG("irq=%d\n", dev->irq);
+
+	if (drm_core_check_feature(dev, DRIVER_LEGACY))
+		vga_client_register(dev->pdev, NULL, NULL, NULL);
+
+	if (dev->driver->irq_uninstall)
+		dev->driver->irq_uninstall(dev);
+
+	free_irq(dev->irq, dev);
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_irq_uninstall);
+
+int drm_legacy_irq_control(struct drm_device *dev, void *data,
+			   struct drm_file *file_priv)
+{
+	struct drm_control *ctl = data;
+	int ret = 0, irq;
+
+	/* if we haven't irq we fallback for compatibility reasons -
+	 * this used to be a separate function in drm_dma.h
+	 */
+
+	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
+		return 0;
+	if (!drm_core_check_feature(dev, DRIVER_LEGACY))
+		return 0;
+	/* UMS was only ever supported on pci devices. */
+	if (WARN_ON(!dev->pdev))
+		return -EINVAL;
+
+	switch (ctl->func) {
+	case DRM_INST_HANDLER:
+		irq = dev->pdev->irq;
+
+		if (dev->if_version < DRM_IF_VERSION(1, 2) &&
+		    ctl->irq != irq)
+			return -EINVAL;
+		mutex_lock(&dev->struct_mutex);
+		ret = drm_irq_install(dev, irq);
+		mutex_unlock(&dev->struct_mutex);
+
+		return ret;
+	case DRM_UNINST_HANDLER:
+		mutex_lock(&dev->struct_mutex);
+		ret = drm_irq_uninstall(dev);
+		mutex_unlock(&dev->struct_mutex);
+
+		return ret;
+	default:
+		return -EINVAL;
+	}
+}