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usb: dwc2: Fix DMA alignment to start at allocated boundary

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The commit 3bc04e28a0 ("usb: dwc2: host: Get aligned DMA in a more
supported way") introduced a common way to align DMA allocations.
The code in the commit aligns the struct dma_aligned_buffer but the
actual DMA address pointed by data[0] gets aligned to an offset from
the allocated boundary by the kmalloc_ptr and the old_xfer_buffer
pointers.

This is against the recommendation in Documentation/DMA-API.txt which
states:

  Therefore, it is recommended that driver writers who don't take
  special care to determine the cache line size at run time only map
  virtual regions that begin and end on page boundaries (which are
  guaranteed also to be cache line boundaries).

The effect of this is that architectures with non-coherent DMA caches
may run into memory corruption or kernel crashes with Unhandled
kernel unaligned accesses exceptions.

Fix the alignment by positioning the DMA area in front of the allocation
and use memory at the end of the area for storing the orginal
transfer_buffer pointer. This may have the added benefit of increased
performance as the DMA area is now fully aligned on all architectures.

Tested with Lantiq xRX200 (MIPS) and RPi Model B Rev 2 (ARM).

Fixes: 3bc04e28a0 ("usb: dwc2: host: Get aligned DMA in a more supported way")
Cc: <stable@vger.kernel.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Antti Seppälä 2018-07-05 17:31:53 +03:00 committed by Felipe Balbi
parent 33d8a2f6ac
commit 56406e017a
1 changed files with 23 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
drivers/usb/dwc2/hcd.c
View File

@ -2665,34 +2665,29 @@ static int dwc2_alloc_split_dma_aligned_buf(struct dwc2_hsotg *hsotg,
#define DWC2_USB_DMA_ALIGN 4
struct dma_aligned_buffer {
void *kmalloc_ptr;
void *old_xfer_buffer;
u8 data[0];
};
static void dwc2_free_dma_aligned_buffer(struct urb *urb)
{
struct dma_aligned_buffer *temp;
void *stored_xfer_buffer;
if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
return;
temp = container_of(urb->transfer_buffer,
struct dma_aligned_buffer, data);
/* Restore urb->transfer_buffer from the end of the allocated area */
memcpy(&stored_xfer_buffer, urb->transfer_buffer +
urb->transfer_buffer_length, sizeof(urb->transfer_buffer));
if (usb_urb_dir_in(urb))
memcpy(temp->old_xfer_buffer, temp->data,
memcpy(stored_xfer_buffer, urb->transfer_buffer,
urb->transfer_buffer_length);
urb->transfer_buffer = temp->old_xfer_buffer;
kfree(temp->kmalloc_ptr);
kfree(urb->transfer_buffer);
urb->transfer_buffer = stored_xfer_buffer;
urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
}
static int dwc2_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags)
{
struct dma_aligned_buffer *temp, *kmalloc_ptr;
void *kmalloc_ptr;
size_t kmalloc_size;
if (urb->num_sgs || urb->sg ||
@ -2700,22 +2695,29 @@ static int dwc2_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags)
!((uintptr_t)urb->transfer_buffer & (DWC2_USB_DMA_ALIGN - 1)))
return 0;
/* Allocate a buffer with enough padding for alignment */
/*
* Allocate a buffer with enough padding for original transfer_buffer
* pointer. This allocation is guaranteed to be aligned properly for
* DMA
*/
kmalloc_size = urb->transfer_buffer_length +
sizeof(struct dma_aligned_buffer) + DWC2_USB_DMA_ALIGN - 1;
sizeof(urb->transfer_buffer);
kmalloc_ptr = kmalloc(kmalloc_size, mem_flags);
if (!kmalloc_ptr)
return -ENOMEM;
/* Position our struct dma_aligned_buffer such that data is aligned */
temp = PTR_ALIGN(kmalloc_ptr + 1, DWC2_USB_DMA_ALIGN) - 1;
temp->kmalloc_ptr = kmalloc_ptr;
temp->old_xfer_buffer = urb->transfer_buffer;
/*
* Position value of original urb->transfer_buffer pointer to the end
* of allocation for later referencing
*/
memcpy(kmalloc_ptr + urb->transfer_buffer_length,
&urb->transfer_buffer, sizeof(urb->transfer_buffer));
if (usb_urb_dir_out(urb))
memcpy(temp->data, urb->transfer_buffer,
memcpy(kmalloc_ptr, urb->transfer_buffer,
urb->transfer_buffer_length);
urb->transfer_buffer = temp->data;
urb->transfer_buffer = kmalloc_ptr;
urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;