gpu: ion: Add ION Memory Manager
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
[jstultz: Squished in Colin Cross' move to staging change,
also disables ION from the build, as it won't compile till
the end of the patchset]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
new file mode 100644
index 0000000..3daa1ee
--- /dev/null
+++ b/drivers/staging/android/ion/ion_system_heap.c
@@ -0,0 +1,198 @@
+/*
+ * drivers/staging/android/ion/ion_system_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/err.h>
+#include <linux/mm.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include "ion.h"
+#include "ion_priv.h"
+
+static int ion_system_heap_allocate(struct ion_heap *heap,
+ struct ion_buffer *buffer,
+ unsigned long size, unsigned long align,
+ unsigned long flags)
+{
+ buffer->priv_virt = vmalloc_user(size);
+ if (!buffer->priv_virt)
+ return -ENOMEM;
+ return 0;
+}
+
+void ion_system_heap_free(struct ion_buffer *buffer)
+{
+ vfree(buffer->priv_virt);
+}
+
+struct scatterlist *ion_system_heap_map_dma(struct ion_heap *heap,
+ struct ion_buffer *buffer)
+{
+ struct scatterlist *sglist;
+ struct page *page;
+ int i;
+ int npages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
+ void *vaddr = buffer->priv_virt;
+
+ sglist = vmalloc(npages * sizeof(struct scatterlist));
+ if (!sglist)
+ return ERR_PTR(-ENOMEM);
+ memset(sglist, 0, npages * sizeof(struct scatterlist));
+ sg_init_table(sglist, npages);
+ for (i = 0; i < npages; i++) {
+ page = vmalloc_to_page(vaddr);
+ if (!page)
+ goto end;
+ sg_set_page(&sglist[i], page, PAGE_SIZE, 0);
+ vaddr += PAGE_SIZE;
+ }
+ /* XXX do cache maintenance for dma? */
+ return sglist;
+end:
+ vfree(sglist);
+ return NULL;
+}
+
+void ion_system_heap_unmap_dma(struct ion_heap *heap,
+ struct ion_buffer *buffer)
+{
+ /* XXX undo cache maintenance for dma? */
+ if (buffer->sglist)
+ vfree(buffer->sglist);
+}
+
+void *ion_system_heap_map_kernel(struct ion_heap *heap,
+ struct ion_buffer *buffer)
+{
+ return buffer->priv_virt;
+}
+
+void ion_system_heap_unmap_kernel(struct ion_heap *heap,
+ struct ion_buffer *buffer)
+{
+}
+
+int ion_system_heap_map_user(struct ion_heap *heap, struct ion_buffer *buffer,
+ struct vm_area_struct *vma)
+{
+ return remap_vmalloc_range(vma, buffer->priv_virt, vma->vm_pgoff);
+}
+
+static struct ion_heap_ops vmalloc_ops = {
+ .allocate = ion_system_heap_allocate,
+ .free = ion_system_heap_free,
+ .map_dma = ion_system_heap_map_dma,
+ .unmap_dma = ion_system_heap_unmap_dma,
+ .map_kernel = ion_system_heap_map_kernel,
+ .unmap_kernel = ion_system_heap_unmap_kernel,
+ .map_user = ion_system_heap_map_user,
+};
+
+struct ion_heap *ion_system_heap_create(struct ion_platform_heap *unused)
+{
+ struct ion_heap *heap;
+
+ heap = kzalloc(sizeof(struct ion_heap), GFP_KERNEL);
+ if (!heap)
+ return ERR_PTR(-ENOMEM);
+ heap->ops = &vmalloc_ops;
+ heap->type = ION_HEAP_TYPE_SYSTEM;
+ return heap;
+}
+
+void ion_system_heap_destroy(struct ion_heap *heap)
+{
+ kfree(heap);
+}
+
+static int ion_system_contig_heap_allocate(struct ion_heap *heap,
+ struct ion_buffer *buffer,
+ unsigned long len,
+ unsigned long align,
+ unsigned long flags)
+{
+ buffer->priv_virt = kzalloc(len, GFP_KERNEL);
+ if (!buffer->priv_virt)
+ return -ENOMEM;
+ return 0;
+}
+
+void ion_system_contig_heap_free(struct ion_buffer *buffer)
+{
+ kfree(buffer->priv_virt);
+}
+
+static int ion_system_contig_heap_phys(struct ion_heap *heap,
+ struct ion_buffer *buffer,
+ ion_phys_addr_t *addr, size_t *len)
+{
+ *addr = virt_to_phys(buffer->priv_virt);
+ *len = buffer->size;
+ return 0;
+}
+
+struct scatterlist *ion_system_contig_heap_map_dma(struct ion_heap *heap,
+ struct ion_buffer *buffer)
+{
+ struct scatterlist *sglist;
+
+ sglist = vmalloc(sizeof(struct scatterlist));
+ if (!sglist)
+ return ERR_PTR(-ENOMEM);
+ sg_init_table(sglist, 1);
+ sg_set_page(sglist, virt_to_page(buffer->priv_virt), buffer->size, 0);
+ return sglist;
+}
+
+int ion_system_contig_heap_map_user(struct ion_heap *heap,
+ struct ion_buffer *buffer,
+ struct vm_area_struct *vma)
+{
+ unsigned long pfn = __phys_to_pfn(virt_to_phys(buffer->priv_virt));
+ return remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff,
+ vma->vm_end - vma->vm_start,
+ vma->vm_page_prot);
+
+}
+
+static struct ion_heap_ops kmalloc_ops = {
+ .allocate = ion_system_contig_heap_allocate,
+ .free = ion_system_contig_heap_free,
+ .phys = ion_system_contig_heap_phys,
+ .map_dma = ion_system_contig_heap_map_dma,
+ .unmap_dma = ion_system_heap_unmap_dma,
+ .map_kernel = ion_system_heap_map_kernel,
+ .unmap_kernel = ion_system_heap_unmap_kernel,
+ .map_user = ion_system_contig_heap_map_user,
+};
+
+struct ion_heap *ion_system_contig_heap_create(struct ion_platform_heap *unused)
+{
+ struct ion_heap *heap;
+
+ heap = kzalloc(sizeof(struct ion_heap), GFP_KERNEL);
+ if (!heap)
+ return ERR_PTR(-ENOMEM);
+ heap->ops = &kmalloc_ops;
+ heap->type = ION_HEAP_TYPE_SYSTEM_CONTIG;
+ return heap;
+}
+
+void ion_system_contig_heap_destroy(struct ion_heap *heap)
+{
+ kfree(heap);
+}
+