1 files changed, 314 insertions, 0 deletions
diff --git a/nx-X11/extras/drm/shared-core/radeon_mem.c b/nx-X11/extras/drm/shared-core/radeon_mem.c
new file mode 100644
index 000000000..01048a5a3
--- /dev/null
+++ b/nx-X11/extras/drm/shared-core/radeon_mem.c
@@ -0,0 +1,314 @@
+/* radeon_mem.c -- Simple GART/fb memory manager for radeon -*- linux-c -*-
+ *
+ * Copyright (C) The Weather Channel, Inc.  2002.  All Rights Reserved.
+ *
+ * The Weather Channel (TM) funded Tungsten Graphics to develop the
+ * initial release of the Radeon 8500 driver under the XFree86 license.
+ * This notice must be preserved.
+ *
+ * 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.
+ *
+ * Authors:
+ *    Keith Whitwell <keith@tungstengraphics.com>
+ */
+
+#include "drmP.h"
+#include "drm.h"
+#include "radeon_drm.h"
+#include "radeon_drv.h"
+
+/* Very simple allocator for GART memory, working on a static range
+ * already mapped into each client's address space.
+ */
+
+static struct mem_block *split_block(struct mem_block *p, int start, int size,
+				     DRMFILE filp)
+{
+	/* Maybe cut off the start of an existing block */
+	if (start > p->start) {
+		struct mem_block *newblock =
+		    drm_alloc(sizeof(*newblock), DRM_MEM_BUFS);
+		if (!newblock)
+			goto out;
+		newblock->start = start;
+		newblock->size = p->size - (start - p->start);
+		newblock->filp = NULL;
+		newblock->next = p->next;
+		newblock->prev = p;
+		p->next->prev = newblock;
+		p->next = newblock;
+		p->size -= newblock->size;
+		p = newblock;
+	}
+
+	/* Maybe cut off the end of an existing block */
+	if (size < p->size) {
+		struct mem_block *newblock =
+		    drm_alloc(sizeof(*newblock), DRM_MEM_BUFS);
+		if (!newblock)
+			goto out;
+		newblock->start = start + size;
+		newblock->size = p->size - size;
+		newblock->filp = NULL;
+		newblock->next = p->next;
+		newblock->prev = p;
+		p->next->prev = newblock;
+		p->next = newblock;
+		p->size = size;
+	}
+
+      out:
+	/* Our block is in the middle */
+	p->filp = filp;
+	return p;
+}
+
+static struct mem_block *alloc_block(struct mem_block *heap, int size,
+				     int align2, DRMFILE filp)
+{
+	struct mem_block *p;
+	int mask = (1 << align2) - 1;
+
+	list_for_each(p, heap) {
+		int start = (p->start + mask) & ~mask;
+		if (p->filp == 0 && start + size <= p->start + p->size)
+			return split_block(p, start, size, filp);
+	}
+
+	return NULL;
+}
+
+static struct mem_block *find_block(struct mem_block *heap, int start)
+{
+	struct mem_block *p;
+
+	list_for_each(p, heap)
+		if (p->start == start)
+			return p;
+
+	return NULL;
+}
+
+static void free_block(struct mem_block *p)
+{
+	p->filp = NULL;
+
+	/* Assumes a single contiguous range.  Needs a special filp in
+	 * 'heap' to stop it being subsumed.
+	 */
+	if (p->next->filp == 0) {
+		struct mem_block *q = p->next;
+		p->size += q->size;
+		p->next = q->next;
+		p->next->prev = p;
+		drm_free(q, sizeof(*q), DRM_MEM_BUFS);
+	}
+
+	if (p->prev->filp == 0) {
+		struct mem_block *q = p->prev;
+		q->size += p->size;
+		q->next = p->next;
+		q->next->prev = q;
+		drm_free(p, sizeof(*q), DRM_MEM_BUFS);
+	}
+}
+
+/* Initialize.  How to check for an uninitialized heap?
+ */
+static int init_heap(struct mem_block **heap, int start, int size)
+{
+	struct mem_block *blocks = drm_alloc(sizeof(*blocks), DRM_MEM_BUFS);
+
+	if (!blocks)
+		return DRM_ERR(ENOMEM);
+
+	*heap = drm_alloc(sizeof(**heap), DRM_MEM_BUFS);
+	if (!*heap) {
+		drm_free(blocks, sizeof(*blocks), DRM_MEM_BUFS);
+		return DRM_ERR(ENOMEM);
+	}
+
+	blocks->start = start;
+	blocks->size = size;
+	blocks->filp = NULL;
+	blocks->next = blocks->prev = *heap;
+
+	memset(*heap, 0, sizeof(**heap));
+	(*heap)->filp = (DRMFILE) - 1;
+	(*heap)->next = (*heap)->prev = blocks;
+	return 0;
+}
+
+/* Free all blocks associated with the releasing file.
+ */
+void radeon_mem_release(DRMFILE filp, struct mem_block *heap)
+{
+	struct mem_block *p;
+
+	if (!heap || !heap->next)
+		return;
+
+	list_for_each(p, heap) {
+		if (p->filp == filp)
+			p->filp = NULL;
+	}
+
+	/* Assumes a single contiguous range.  Needs a special filp in
+	 * 'heap' to stop it being subsumed.
+	 */
+	list_for_each(p, heap) {
+		while (p->filp == 0 && p->next->filp == 0) {
+			struct mem_block *q = p->next;
+			p->size += q->size;
+			p->next = q->next;
+			p->next->prev = p;
+			drm_free(q, sizeof(*q), DRM_MEM_DRIVER);
+		}
+	}
+}
+
+/* Shutdown.
+ */
+void radeon_mem_takedown(struct mem_block **heap)
+{
+	struct mem_block *p;
+
+	if (!*heap)
+		return;
+
+	for (p = (*heap)->next; p != *heap;) {
+		struct mem_block *q = p;
+		p = p->next;
+		drm_free(q, sizeof(*q), DRM_MEM_DRIVER);
+	}
+
+	drm_free(*heap, sizeof(**heap), DRM_MEM_DRIVER);
+	*heap = NULL;
+}
+
+/* IOCTL HANDLERS */
+
+static struct mem_block **get_heap(drm_radeon_private_t * dev_priv, int region)
+{
+	switch (region) {
+	case RADEON_MEM_REGION_GART:
+		return &dev_priv->gart_heap;
+	case RADEON_MEM_REGION_FB:
+		return &dev_priv->fb_heap;
+	default:
+		return NULL;
+	}
+}
+
+int radeon_mem_alloc(DRM_IOCTL_ARGS)
+{
+	DRM_DEVICE;
+	drm_radeon_private_t *dev_priv = dev->dev_private;
+	drm_radeon_mem_alloc_t alloc;
+	struct mem_block *block, **heap;
+
+	if (!dev_priv) {
+		DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
+		return DRM_ERR(EINVAL);
+	}
+
+	DRM_COPY_FROM_USER_IOCTL(alloc, (drm_radeon_mem_alloc_t __user *) data,
+				 sizeof(alloc));
+
+	heap = get_heap(dev_priv, alloc.region);
+	if (!heap || !*heap)
+		return DRM_ERR(EFAULT);
+
+	/* Make things easier on ourselves: all allocations at least
+	 * 4k aligned.
+	 */
+	if (alloc.alignment < 12)
+		alloc.alignment = 12;
+
+	block = alloc_block(*heap, alloc.size, alloc.alignment, filp);
+
+	if (!block)
+		return DRM_ERR(ENOMEM);
+
+	if (DRM_COPY_TO_USER(alloc.region_offset, &block->start, sizeof(int))) {
+		DRM_ERROR("copy_to_user\n");
+		return DRM_ERR(EFAULT);
+	}
+
+	return 0;
+}
+
+int radeon_mem_free(DRM_IOCTL_ARGS)
+{
+	DRM_DEVICE;
+	drm_radeon_private_t *dev_priv = dev->dev_private;
+	drm_radeon_mem_free_t memfree;
+	struct mem_block *block, **heap;
+
+	if (!dev_priv) {
+		DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
+		return DRM_ERR(EINVAL);
+	}
+
+	DRM_COPY_FROM_USER_IOCTL(memfree, (drm_radeon_mem_free_t __user *) data,
+				 sizeof(memfree));
+
+	heap = get_heap(dev_priv, memfree.region);
+	if (!heap || !*heap)
+		return DRM_ERR(EFAULT);
+
+	block = find_block(*heap, memfree.region_offset);
+	if (!block)
+		return DRM_ERR(EFAULT);
+
+	if (block->filp != filp)
+		return DRM_ERR(EPERM);
+
+	free_block(block);
+	return 0;
+}
+
+int radeon_mem_init_heap(DRM_IOCTL_ARGS)
+{
+	DRM_DEVICE;
+	drm_radeon_private_t *dev_priv = dev->dev_private;
+	drm_radeon_mem_init_heap_t initheap;
+	struct mem_block **heap;
+
+	if (!dev_priv) {
+		DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
+		return DRM_ERR(EINVAL);
+	}
+
+	DRM_COPY_FROM_USER_IOCTL(initheap,
+				 (drm_radeon_mem_init_heap_t __user *) data,
+				 sizeof(initheap));
+
+	heap = get_heap(dev_priv, initheap.region);
+	if (!heap)
+		return DRM_ERR(EFAULT);
+
+	if (*heap) {
+		DRM_ERROR("heap already initialized?");
+		return DRM_ERR(EFAULT);
+	}
+
+	return init_heap(heap, initheap.start, initheap.size);
+}