Adding upstream version 5.10.209.upstream/5.10.209

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

1 files changed, 220 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_scatter.c b/drivers/gpu/drm/drm_scatter.c
new file mode 100644
index 000000000..f4e6184d1
--- /dev/null
+++ b/drivers/gpu/drm/drm_scatter.c
@@ -0,0 +1,220 @@
+/*
+ * \file drm_scatter.c
+ * IOCTLs to manage scatter/gather memory
+ *
+ * \author Gareth Hughes <gareth@valinux.com>
+ */
+
+/*
+ * Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com
+ *
+ * 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
+ * PRECISION INSIGHT 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 <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+
+#include <drm/drm.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_print.h>
+
+#include "drm_legacy.h"
+
+#define DEBUG_SCATTER 0
+
+static void drm_sg_cleanup(struct drm_sg_mem * entry)
+{
+	struct page *page;
+	int i;
+
+	for (i = 0; i < entry->pages; i++) {
+		page = entry->pagelist[i];
+		if (page)
+			ClearPageReserved(page);
+	}
+
+	vfree(entry->virtual);
+
+	kfree(entry->busaddr);
+	kfree(entry->pagelist);
+	kfree(entry);
+}
+
+void drm_legacy_sg_cleanup(struct drm_device *dev)
+{
+	if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg &&
+	    drm_core_check_feature(dev, DRIVER_LEGACY)) {
+		drm_sg_cleanup(dev->sg);
+		dev->sg = NULL;
+	}
+}
+#ifdef _LP64
+# define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1)))
+#else
+# define ScatterHandle(x) (unsigned int)(x)
+#endif
+
+int drm_legacy_sg_alloc(struct drm_device *dev, void *data,
+			struct drm_file *file_priv)
+{
+	struct drm_scatter_gather *request = data;
+	struct drm_sg_mem *entry;
+	unsigned long pages, i, j;
+
+	DRM_DEBUG("\n");
+
+	if (!drm_core_check_feature(dev, DRIVER_LEGACY))
+		return -EOPNOTSUPP;
+
+	if (!drm_core_check_feature(dev, DRIVER_SG))
+		return -EOPNOTSUPP;
+
+	if (request->size > SIZE_MAX - PAGE_SIZE)
+		return -EINVAL;
+
+	if (dev->sg)
+		return -EINVAL;
+
+	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+	if (!entry)
+		return -ENOMEM;
+
+	pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
+	DRM_DEBUG("size=%ld pages=%ld\n", request->size, pages);
+
+	entry->pages = pages;
+	entry->pagelist = kcalloc(pages, sizeof(*entry->pagelist), GFP_KERNEL);
+	if (!entry->pagelist) {
+		kfree(entry);
+		return -ENOMEM;
+	}
+
+	entry->busaddr = kcalloc(pages, sizeof(*entry->busaddr), GFP_KERNEL);
+	if (!entry->busaddr) {
+		kfree(entry->pagelist);
+		kfree(entry);
+		return -ENOMEM;
+	}
+
+	entry->virtual = vmalloc_32(pages << PAGE_SHIFT);
+	if (!entry->virtual) {
+		kfree(entry->busaddr);
+		kfree(entry->pagelist);
+		kfree(entry);
+		return -ENOMEM;
+	}
+
+	/* This also forces the mapping of COW pages, so our page list
+	 * will be valid.  Please don't remove it...
+	 */
+	memset(entry->virtual, 0, pages << PAGE_SHIFT);
+
+	entry->handle = ScatterHandle((unsigned long)entry->virtual);
+
+	DRM_DEBUG("handle  = %08lx\n", entry->handle);
+	DRM_DEBUG("virtual = %p\n", entry->virtual);
+
+	for (i = (unsigned long)entry->virtual, j = 0; j < pages;
+	     i += PAGE_SIZE, j++) {
+		entry->pagelist[j] = vmalloc_to_page((void *)i);
+		if (!entry->pagelist[j])
+			goto failed;
+		SetPageReserved(entry->pagelist[j]);
+	}
+
+	request->handle = entry->handle;
+
+	dev->sg = entry;
+
+#if DEBUG_SCATTER
+	/* Verify that each page points to its virtual address, and vice
+	 * versa.
+	 */
+	{
+		int error = 0;
+
+		for (i = 0; i < pages; i++) {
+			unsigned long *tmp;
+
+			tmp = page_address(entry->pagelist[i]);
+			for (j = 0;
+			     j < PAGE_SIZE / sizeof(unsigned long);
+			     j++, tmp++) {
+				*tmp = 0xcafebabe;
+			}
+			tmp = (unsigned long *)((u8 *) entry->virtual +
+						(PAGE_SIZE * i));
+			for (j = 0;
+			     j < PAGE_SIZE / sizeof(unsigned long);
+			     j++, tmp++) {
+				if (*tmp != 0xcafebabe && error == 0) {
+					error = 1;
+					DRM_ERROR("Scatter allocation error, "
+						  "pagelist does not match "
+						  "virtual mapping\n");
+				}
+			}
+			tmp = page_address(entry->pagelist[i]);
+			for (j = 0;
+			     j < PAGE_SIZE / sizeof(unsigned long);
+			     j++, tmp++) {
+				*tmp = 0;
+			}
+		}
+		if (error == 0)
+			DRM_ERROR("Scatter allocation matches pagelist\n");
+	}
+#endif
+
+	return 0;
+
+      failed:
+	drm_sg_cleanup(entry);
+	return -ENOMEM;
+}
+
+int drm_legacy_sg_free(struct drm_device *dev, void *data,
+		       struct drm_file *file_priv)
+{
+	struct drm_scatter_gather *request = data;
+	struct drm_sg_mem *entry;
+
+	if (!drm_core_check_feature(dev, DRIVER_LEGACY))
+		return -EOPNOTSUPP;
+
+	if (!drm_core_check_feature(dev, DRIVER_SG))
+		return -EOPNOTSUPP;
+
+	entry = dev->sg;
+	dev->sg = NULL;
+
+	if (!entry || entry->handle != request->handle)
+		return -EINVAL;
+
+	DRM_DEBUG("virtual  = %p\n", entry->virtual);
+
+	drm_sg_cleanup(entry);
+
+	return 0;
+}