drm: reorganise drm tree to be more future proof.

With the coming of kernel based modesetting and the memory manager stuff,
the everything in one directory approach was getting very ugly and
starting to be unmanageable.

This restructures the drm along the lines of other kernel components.

It creates a drivers/gpu/drm directory and moves the hw drivers into
subdirectores. It moves the includes into an include/drm, and
sets up the unifdef for the userspace headers we should be exporting.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 386 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_mem.c b/drivers/gpu/drm/i915/i915_mem.c
new file mode 100644
index 0000000..6126a60
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_mem.c
@@ -0,0 +1,386 @@
+/* i915_mem.c -- Simple agp/fb memory manager for i915 -*- linux-c -*-
+ */
+/*
+ * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * 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, sub license, 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS 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 "drmP.h"
+#include "drm.h"
+#include "i915_drm.h"
+#include "i915_drv.h"
+
+/* This memory manager is integrated into the global/local lru
+ * mechanisms used by the clients.  Specifically, it operates by
+ * setting the 'in_use' fields of the global LRU to indicate whether
+ * this region is privately allocated to a client.
+ *
+ * This does require the client to actually respect that field.
+ *
+ * Currently no effort is made to allocate 'private' memory in any
+ * clever way - the LRU information isn't used to determine which
+ * block to allocate, and the ring is drained prior to allocations --
+ * in other words allocation is expensive.
+ */
+static void mark_block(struct drm_device * dev, struct mem_block *p, int in_use)
+{
+	drm_i915_private_t *dev_priv = dev->dev_private;
+	drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
+	struct drm_tex_region *list;
+	unsigned shift, nr;
+	unsigned start;
+	unsigned end;
+	unsigned i;
+	int age;
+
+	shift = dev_priv->tex_lru_log_granularity;
+	nr = I915_NR_TEX_REGIONS;
+
+	start = p->start >> shift;
+	end = (p->start + p->size - 1) >> shift;
+
+	age = ++sarea_priv->texAge;
+	list = sarea_priv->texList;
+
+	/* Mark the regions with the new flag and update their age.  Move
+	 * them to head of list to preserve LRU semantics.
+	 */
+	for (i = start; i <= end; i++) {
+		list[i].in_use = in_use;
+		list[i].age = age;
+
+		/* remove_from_list(i)
+		 */
+		list[(unsigned)list[i].next].prev = list[i].prev;
+		list[(unsigned)list[i].prev].next = list[i].next;
+
+		/* insert_at_head(list, i)
+		 */
+		list[i].prev = nr;
+		list[i].next = list[nr].next;
+		list[(unsigned)list[nr].next].prev = i;
+		list[nr].next = i;
+	}
+}
+
+/* Very simple allocator for agp 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,
+				     struct drm_file *file_priv)
+{
+	/* Maybe cut off the start of an existing block */
+	if (start > p->start) {
+		struct mem_block *newblock =
+		    drm_alloc(sizeof(*newblock), DRM_MEM_BUFLISTS);
+		if (!newblock)
+			goto out;
+		newblock->start = start;
+		newblock->size = p->size - (start - p->start);
+		newblock->file_priv = 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_BUFLISTS);
+		if (!newblock)
+			goto out;
+		newblock->start = start + size;
+		newblock->size = p->size - size;
+		newblock->file_priv = 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->file_priv = file_priv;
+	return p;
+}
+
+static struct mem_block *alloc_block(struct mem_block *heap, int size,
+				     int align2, struct drm_file *file_priv)
+{
+	struct mem_block *p;
+	int mask = (1 << align2) - 1;
+
+	for (p = heap->next; p != heap; p = p->next) {
+		int start = (p->start + mask) & ~mask;
+		if (p->file_priv == NULL && start + size <= p->start + p->size)
+			return split_block(p, start, size, file_priv);
+	}
+
+	return NULL;
+}
+
+static struct mem_block *find_block(struct mem_block *heap, int start)
+{
+	struct mem_block *p;
+
+	for (p = heap->next; p != heap; p = p->next)
+		if (p->start == start)
+			return p;
+
+	return NULL;
+}
+
+static void free_block(struct mem_block *p)
+{
+	p->file_priv = NULL;
+
+	/* Assumes a single contiguous range.  Needs a special file_priv in
+	 * 'heap' to stop it being subsumed.
+	 */
+	if (p->next->file_priv == NULL) {
+		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_BUFLISTS);
+	}
+
+	if (p->prev->file_priv == NULL) {
+		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_BUFLISTS);
+	}
+}
+
+/* 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_BUFLISTS);
+
+	if (!blocks)
+		return -ENOMEM;
+
+	*heap = drm_alloc(sizeof(**heap), DRM_MEM_BUFLISTS);
+	if (!*heap) {
+		drm_free(blocks, sizeof(*blocks), DRM_MEM_BUFLISTS);
+		return -ENOMEM;
+	}
+
+	blocks->start = start;
+	blocks->size = size;
+	blocks->file_priv = NULL;
+	blocks->next = blocks->prev = *heap;
+
+	memset(*heap, 0, sizeof(**heap));
+	(*heap)->file_priv = (struct drm_file *) - 1;
+	(*heap)->next = (*heap)->prev = blocks;
+	return 0;
+}
+
+/* Free all blocks associated with the releasing file.
+ */
+void i915_mem_release(struct drm_device * dev, struct drm_file *file_priv,
+		      struct mem_block *heap)
+{
+	struct mem_block *p;
+
+	if (!heap || !heap->next)
+		return;
+
+	for (p = heap->next; p != heap; p = p->next) {
+		if (p->file_priv == file_priv) {
+			p->file_priv = NULL;
+			mark_block(dev, p, 0);
+		}
+	}
+
+	/* Assumes a single contiguous range.  Needs a special file_priv in
+	 * 'heap' to stop it being subsumed.
+	 */
+	for (p = heap->next; p != heap; p = p->next) {
+		while (p->file_priv == NULL && p->next->file_priv == NULL) {
+			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_BUFLISTS);
+		}
+	}
+}
+
+/* Shutdown.
+ */
+void i915_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_BUFLISTS);
+	}
+
+	drm_free(*heap, sizeof(**heap), DRM_MEM_BUFLISTS);
+	*heap = NULL;
+}
+
+static struct mem_block **get_heap(drm_i915_private_t * dev_priv, int region)
+{
+	switch (region) {
+	case I915_MEM_REGION_AGP:
+		return &dev_priv->agp_heap;
+	default:
+		return NULL;
+	}
+}
+
+/* IOCTL HANDLERS */
+
+int i915_mem_alloc(struct drm_device *dev, void *data,
+		   struct drm_file *file_priv)
+{
+	drm_i915_private_t *dev_priv = dev->dev_private;
+	drm_i915_mem_alloc_t *alloc = data;
+	struct mem_block *block, **heap;
+
+	if (!dev_priv) {
+		DRM_ERROR("called with no initialization\n");
+		return -EINVAL;
+	}
+
+	heap = get_heap(dev_priv, alloc->region);
+	if (!heap || !*heap)
+		return -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, file_priv);
+
+	if (!block)
+		return -ENOMEM;
+
+	mark_block(dev, block, 1);
+
+	if (DRM_COPY_TO_USER(alloc->region_offset, &block->start,
+			     sizeof(int))) {
+		DRM_ERROR("copy_to_user\n");
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+int i915_mem_free(struct drm_device *dev, void *data,
+		  struct drm_file *file_priv)
+{
+	drm_i915_private_t *dev_priv = dev->dev_private;
+	drm_i915_mem_free_t *memfree = data;
+	struct mem_block *block, **heap;
+
+	if (!dev_priv) {
+		DRM_ERROR("called with no initialization\n");
+		return -EINVAL;
+	}
+
+	heap = get_heap(dev_priv, memfree->region);
+	if (!heap || !*heap)
+		return -EFAULT;
+
+	block = find_block(*heap, memfree->region_offset);
+	if (!block)
+		return -EFAULT;
+
+	if (block->file_priv != file_priv)
+		return -EPERM;
+
+	mark_block(dev, block, 0);
+	free_block(block);
+	return 0;
+}
+
+int i915_mem_init_heap(struct drm_device *dev, void *data,
+		       struct drm_file *file_priv)
+{
+	drm_i915_private_t *dev_priv = dev->dev_private;
+	drm_i915_mem_init_heap_t *initheap = data;
+	struct mem_block **heap;
+
+	if (!dev_priv) {
+		DRM_ERROR("called with no initialization\n");
+		return -EINVAL;
+	}
+
+	heap = get_heap(dev_priv, initheap->region);
+	if (!heap)
+		return -EFAULT;
+
+	if (*heap) {
+		DRM_ERROR("heap already initialized?");
+		return -EFAULT;
+	}
+
+	return init_heap(heap, initheap->start, initheap->size);
+}
+
+int i915_mem_destroy_heap( struct drm_device *dev, void *data,
+			   struct drm_file *file_priv )
+{
+	drm_i915_private_t *dev_priv = dev->dev_private;
+	drm_i915_mem_destroy_heap_t *destroyheap = data;
+	struct mem_block **heap;
+
+	if ( !dev_priv ) {
+		DRM_ERROR( "called with no initialization\n" );
+		return -EINVAL;
+	}
+
+	heap = get_heap( dev_priv, destroyheap->region );
+	if (!heap) {
+		DRM_ERROR("get_heap failed");
+		return -EFAULT;
+	}
+
+	if (!*heap) {
+		DRM_ERROR("heap not initialized?");
+		return -EFAULT;
+	}
+
+	i915_mem_takedown( heap );
+	return 0;
+}