1 files changed, 162 insertions, 0 deletions

diff --git a/drivers/gpu/ion/ion_carveout_heap.c b/drivers/gpu/ion/ion_carveout_heap.c
new file mode 100644
index 00000000000..606adae13f4
--- /dev/null
+++ b/drivers/gpu/ion/ion_carveout_heap.c
@@ -0,0 +1,162 @@
+/*
+ * drivers/gpu/ion/ion_carveout_heap.c
+ *
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <linux/spinlock.h>
+
+#include <linux/err.h>
+#include <linux/genalloc.h>
+#include <linux/io.h>
+#include <linux/ion.h>
+#include <linux/mm.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include "ion_priv.h"
+
+#include <asm/mach/map.h>
+
+struct ion_carveout_heap {
+        struct ion_heap heap;
+        struct gen_pool *pool;
+        ion_phys_addr_t base;
+};
+
+ion_phys_addr_t ion_carveout_allocate(struct ion_heap *heap,
+                                      unsigned long size,
+                                      unsigned long align)
+{
+        struct ion_carveout_heap *carveout_heap =
+                container_of(heap, struct ion_carveout_heap, heap);
+        unsigned long offset = gen_pool_alloc(carveout_heap->pool, size);
+
+        if (!offset)
+                return ION_CARVEOUT_ALLOCATE_FAIL;
+
+        return offset;
+}
+
+void ion_carveout_free(struct ion_heap *heap, ion_phys_addr_t addr,
+                       unsigned long size)
+{
+        struct ion_carveout_heap *carveout_heap =
+                container_of(heap, struct ion_carveout_heap, heap);
+
+        if (addr == ION_CARVEOUT_ALLOCATE_FAIL)
+                return;
+        gen_pool_free(carveout_heap->pool, addr, size);
+}
+
+static int ion_carveout_heap_phys(struct ion_heap *heap,
+                                  struct ion_buffer *buffer,
+                                  ion_phys_addr_t *addr, size_t *len)
+{
+        *addr = buffer->priv_phys;
+        *len = buffer->size;
+        return 0;
+}
+
+static int ion_carveout_heap_allocate(struct ion_heap *heap,
+                                      struct ion_buffer *buffer,
+                                      unsigned long size, unsigned long align,
+                                      unsigned long flags)
+{
+        buffer->priv_phys = ion_carveout_allocate(heap, size, align);
+        return buffer->priv_phys == ION_CARVEOUT_ALLOCATE_FAIL ? -ENOMEM : 0;
+}
+
+static void ion_carveout_heap_free(struct ion_buffer *buffer)
+{
+        struct ion_heap *heap = buffer->heap;
+
+        ion_carveout_free(heap, buffer->priv_phys, buffer->size);
+        buffer->priv_phys = ION_CARVEOUT_ALLOCATE_FAIL;
+}
+
+struct scatterlist *ion_carveout_heap_map_dma(struct ion_heap *heap,
+                                              struct ion_buffer *buffer)
+{
+        return ERR_PTR(-EINVAL);
+}
+
+void ion_carveout_heap_unmap_dma(struct ion_heap *heap,
+                                 struct ion_buffer *buffer)
+{
+        return;
+}
+
+void *ion_carveout_heap_map_kernel(struct ion_heap *heap,
+                                   struct ion_buffer *buffer)
+{
+        return __arch_ioremap(buffer->priv_phys, buffer->size,
+                              MT_MEMORY_NONCACHED);
+}
+
+void ion_carveout_heap_unmap_kernel(struct ion_heap *heap,
+                                    struct ion_buffer *buffer)
+{
+        __arch_iounmap(buffer->vaddr);
+        buffer->vaddr = NULL;
+        return;
+}
+
+int ion_carveout_heap_map_user(struct ion_heap *heap, struct ion_buffer *buffer,
+                               struct vm_area_struct *vma)
+{
+        return remap_pfn_range(vma, vma->vm_start,
+                               __phys_to_pfn(buffer->priv_phys) + vma->vm_pgoff,
+                               buffer->size,
+                               pgprot_noncached(vma->vm_page_prot));
+}
+
+static struct ion_heap_ops carveout_heap_ops = {
+        .allocate = ion_carveout_heap_allocate,
+        .free = ion_carveout_heap_free,
+        .phys = ion_carveout_heap_phys,
+        .map_user = ion_carveout_heap_map_user,
+        .map_kernel = ion_carveout_heap_map_kernel,
+        .unmap_kernel = ion_carveout_heap_unmap_kernel,
+};
+
+struct ion_heap *ion_carveout_heap_create(struct ion_platform_heap *heap_data)
+{
+        struct ion_carveout_heap *carveout_heap;
+
+        carveout_heap = kzalloc(sizeof(struct ion_carveout_heap), GFP_KERNEL);
+        if (!carveout_heap)
+                return ERR_PTR(-ENOMEM);
+
+        carveout_heap->pool = gen_pool_create(12, -1);
+        if (!carveout_heap->pool) {
+                kfree(carveout_heap);
+                return ERR_PTR(-ENOMEM);
+        }
+        carveout_heap->base = heap_data->base;
+        gen_pool_add(carveout_heap->pool, carveout_heap->base, heap_data->size,
+                     -1);
+        carveout_heap->heap.ops = &carveout_heap_ops;
+        carveout_heap->heap.type = ION_HEAP_TYPE_CARVEOUT;
+
+        return &carveout_heap->heap;
+}
+
+void ion_carveout_heap_destroy(struct ion_heap *heap)
+{
+        struct ion_carveout_heap *carveout_heap =
+             container_of(heap, struct  ion_carveout_heap, heap);
+
+        gen_pool_destroy(carveout_heap->pool);
+        kfree(carveout_heap);
+        carveout_heap = NULL;
+}