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binder: remove kernel vm_area for buffer space 

Remove the kernel's vm_area and the code that maps
buffer pages into it.

Signed-off-by: Todd Kjos <tkjos@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Todd Kjos 2019-02-08 10:35:18 -08:00 committed by Greg Kroah-Hartman
parent db6b0b810b
commit 880211667b
1 changed files with 2 additions and 38 deletions
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40
drivers/android/binder_alloc.c
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@ -265,16 +265,6 @@ static int binder_update_page_range(struct binder_alloc *alloc, int allocate,
page->alloc = alloc;
INIT_LIST_HEAD(&page->lru);
ret = map_kernel_range_noflush((unsigned long)page_addr,
PAGE_SIZE, PAGE_KERNEL,
&page->page_ptr);
flush_cache_vmap((unsigned long)page_addr,
(unsigned long)page_addr + PAGE_SIZE);
if (ret != 1) {
pr_err("%d: binder_alloc_buf failed to map page at %pK in kernel\n",
alloc->pid, page_addr);
goto err_map_kernel_failed;
}
user_page_addr =
(uintptr_t)page_addr + alloc->user_buffer_offset;
ret = vm_insert_page(vma, user_page_addr, page[0].page_ptr);
@ -314,8 +304,6 @@ static int binder_update_page_range(struct binder_alloc *alloc, int allocate,
continue;
err_vm_insert_page_failed:
unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
err_map_kernel_failed:
__free_page(page->page_ptr);
page->page_ptr = NULL;
err_alloc_page_failed:
@ -695,7 +683,6 @@ int binder_alloc_mmap_handler(struct binder_alloc *alloc,
struct vm_area_struct *vma)
{
int ret;
struct vm_struct *area;
const char *failure_string;
struct binder_buffer *buffer;
@ -706,28 +693,10 @@ int binder_alloc_mmap_handler(struct binder_alloc *alloc,
goto err_already_mapped;
}
area = get_vm_area(vma->vm_end - vma->vm_start, VM_ALLOC);
if (area == NULL) {
ret = -ENOMEM;
failure_string = "get_vm_area";
goto err_get_vm_area_failed;
}
alloc->buffer = area->addr;
alloc->user_buffer_offset =
vma->vm_start - (uintptr_t)alloc->buffer;
alloc->buffer = (void *)vma->vm_start;
alloc->user_buffer_offset = 0;
mutex_unlock(&binder_alloc_mmap_lock);
#ifdef CONFIG_CPU_CACHE_VIPT
if (cache_is_vipt_aliasing()) {
while (CACHE_COLOUR(
(vma->vm_start ^ (uint32_t)alloc->buffer))) {
pr_info("%s: %d %lx-%lx maps %pK bad alignment\n",
__func__, alloc->pid, vma->vm_start,
vma->vm_end, alloc->buffer);
vma->vm_start += PAGE_SIZE;
}
}
#endif
alloc->pages = kcalloc((vma->vm_end - vma->vm_start) / PAGE_SIZE,
sizeof(alloc->pages[0]),
GFP_KERNEL);
@ -760,9 +729,7 @@ int binder_alloc_mmap_handler(struct binder_alloc *alloc,
alloc->pages = NULL;
err_alloc_pages_failed:
mutex_lock(&binder_alloc_mmap_lock);
vfree(alloc->buffer);
alloc->buffer = NULL;
err_get_vm_area_failed:
err_already_mapped:
mutex_unlock(&binder_alloc_mmap_lock);
binder_alloc_debug(BINDER_DEBUG_USER_ERROR,
@ -821,12 +788,10 @@ void binder_alloc_deferred_release(struct binder_alloc *alloc)
"%s: %d: page %d at %pK %s\n",
__func__, alloc->pid, i, page_addr,
on_lru ? "on lru" : "active");
unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
__free_page(alloc->pages[i].page_ptr);
page_count++;
}
kfree(alloc->pages);
vfree(alloc->buffer);
}
mutex_unlock(&alloc->mutex);
if (alloc->vma_vm_mm)
@ -988,7 +953,6 @@ enum lru_status binder_alloc_free_page(struct list_head *item,
trace_binder_unmap_kernel_start(alloc, index);
unmap_kernel_range(page_addr, PAGE_SIZE);
__free_page(page->page_ptr);
page->page_ptr = NULL;