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staging: android: ion: Remove page faulting support 

The new method of syncing with dma_map means that the page faulting sync
implementation is no longer applicable. Remove it.

Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Laura Abbott 2017-04-03 11:57:49 -07:00 committed by Greg Kroah-Hartman
parent 2a55e7b5e5
commit 0499a61425
1 changed files with 0 additions and 117 deletions
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117
drivers/staging/android/ion/ion.c
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@ -42,37 +42,11 @@
#include "ion_priv.h"
#include "compat_ion.h"
bool ion_buffer_fault_user_mappings(struct ion_buffer *buffer)
{
return (buffer->flags & ION_FLAG_CACHED) &&
!(buffer->flags & ION_FLAG_CACHED_NEEDS_SYNC);
}
bool ion_buffer_cached(struct ion_buffer *buffer)
{
return !!(buffer->flags & ION_FLAG_CACHED);
}
static inline struct page *ion_buffer_page(struct page *page)
{
return (struct page *)((unsigned long)page & ~(1UL));
}
static inline bool ion_buffer_page_is_dirty(struct page *page)
{
return !!((unsigned long)page & 1UL);
}
static inline void ion_buffer_page_dirty(struct page **page)
{
*page = (struct page *)((unsigned long)(*page) | 1UL);
}
static inline void ion_buffer_page_clean(struct page **page)
{
*page = (struct page *)((unsigned long)(*page) & ~(1UL));
}
/* this function should only be called while dev->lock is held */
static void ion_buffer_add(struct ion_device *dev,
struct ion_buffer *buffer)
@ -140,25 +114,6 @@ static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
buffer->dev = dev;
buffer->size = len;
if (ion_buffer_fault_user_mappings(buffer)) {
int num_pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
struct scatterlist *sg;
int i, j, k = 0;
buffer->pages = vmalloc(sizeof(struct page *) * num_pages);
if (!buffer->pages) {
ret = -ENOMEM;
goto err1;
}
for_each_sg(table->sgl, sg, table->nents, i) {
struct page *page = sg_page(sg);
for (j = 0; j < sg->length / PAGE_SIZE; j++)
buffer->pages[k++] = page++;
}
}
buffer->dev = dev;
buffer->size = len;
INIT_LIST_HEAD(&buffer->vmas);
@ -924,69 +879,6 @@ void ion_pages_sync_for_device(struct device *dev, struct page *page,
dma_sync_sg_for_device(dev, &sg, 1, dir);
}
struct ion_vma_list {
struct list_head list;
struct vm_area_struct *vma;
};
static int ion_vm_fault(struct vm_fault *vmf)
{
struct ion_buffer *buffer = vmf->vma->vm_private_data;
unsigned long pfn;
int ret;
mutex_lock(&buffer->lock);
ion_buffer_page_dirty(buffer->pages + vmf->pgoff);
BUG_ON(!buffer->pages || !buffer->pages[vmf->pgoff]);
pfn = page_to_pfn(ion_buffer_page(buffer->pages[vmf->pgoff]));
ret = vm_insert_pfn(vmf->vma, vmf->address, pfn);
mutex_unlock(&buffer->lock);
if (ret)
return VM_FAULT_ERROR;
return VM_FAULT_NOPAGE;
}
static void ion_vm_open(struct vm_area_struct *vma)
{
struct ion_buffer *buffer = vma->vm_private_data;
struct ion_vma_list *vma_list;
vma_list = kmalloc(sizeof(*vma_list), GFP_KERNEL);
if (!vma_list)
return;
vma_list->vma = vma;
mutex_lock(&buffer->lock);
list_add(&vma_list->list, &buffer->vmas);
mutex_unlock(&buffer->lock);
pr_debug("%s: adding %p\n", __func__, vma);
}
static void ion_vm_close(struct vm_area_struct *vma)
{
struct ion_buffer *buffer = vma->vm_private_data;
struct ion_vma_list *vma_list, *tmp;
pr_debug("%s\n", __func__);
mutex_lock(&buffer->lock);
list_for_each_entry_safe(vma_list, tmp, &buffer->vmas, list) {
if (vma_list->vma != vma)
continue;
list_del(&vma_list->list);
kfree(vma_list);
pr_debug("%s: deleting %p\n", __func__, vma);
break;
}
mutex_unlock(&buffer->lock);
}
static const struct vm_operations_struct ion_vma_ops = {
.open = ion_vm_open,
.close = ion_vm_close,
.fault = ion_vm_fault,
};
static int ion_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
{
struct ion_buffer *buffer = dmabuf->priv;
@ -998,15 +890,6 @@ static int ion_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
return -EINVAL;
}
if (ion_buffer_fault_user_mappings(buffer)) {
vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND |
VM_DONTDUMP;
vma->vm_private_data = buffer;
vma->vm_ops = &ion_vma_ops;
ion_vm_open(vma);
return 0;
}
if (!(buffer->flags & ION_FLAG_CACHED))
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);