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usb: add a hcd_uses_dma helper 

The USB buffer allocation code is the only place in the usb core (and in
fact the whole kernel) that uses is_device_dma_capable, while the URB
mapping code uses the uses_dma flag in struct usb_bus.  Switch the buffer
allocation to use the uses_dma flag used by the rest of the USB code,
and create a helper in hcd.h that checks this flag as well as the
CONFIG_HAS_DMA to simplify the caller a bit.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20190811080520.21712-3-hch@lst.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christoph Hellwig 2019-08-11 10:05:16 +02:00 committed by Greg Kroah-Hartman
parent dd3ecf17ba
commit edfbcb321f
5 changed files with 10 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/usb/core/buffer.c
View File

@ -66,9 +66,7 @@ int hcd_buffer_create(struct usb_hcd *hcd)
char name[16];
int i, size;
if (hcd->localmem_pool ||
!IS_ENABLED(CONFIG_HAS_DMA) ||
!is_device_dma_capable(hcd->self.sysdev))
if (hcd->localmem_pool || !hcd_uses_dma(hcd))
return 0;
for (i = 0; i < HCD_BUFFER_POOLS; i++) {
@ -129,8 +127,7 @@ void *hcd_buffer_alloc(
return gen_pool_dma_alloc(hcd->localmem_pool, size, dma);
/* some USB hosts just use PIO */
if (!IS_ENABLED(CONFIG_HAS_DMA) ||
!is_device_dma_capable(bus->sysdev)) {
if (!hcd_uses_dma(hcd)) {
*dma = ~(dma_addr_t) 0;
return kmalloc(size, mem_flags);
}
@ -160,8 +157,7 @@ void hcd_buffer_free(
return;
}
if (!IS_ENABLED(CONFIG_HAS_DMA) ||
!is_device_dma_capable(bus->sysdev)) {
if (!hcd_uses_dma(hcd)) {
kfree(addr);
return;
}

4
drivers/usb/core/hcd.c
View File

@ -1412,7 +1412,7 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
if (usb_endpoint_xfer_control(&urb->ep->desc)) {
if (hcd->self.uses_pio_for_control)
return ret;
if (IS_ENABLED(CONFIG_HAS_DMA) && hcd->self.uses_dma) {
if (hcd_uses_dma(hcd)) {
if (is_vmalloc_addr(urb->setup_packet)) {
WARN_ONCE(1, "setup packet is not dma capable\n");
return -EAGAIN;
@ -1446,7 +1446,7 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
if (urb->transfer_buffer_length != 0
&& !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) {
if (IS_ENABLED(CONFIG_HAS_DMA) && hcd->self.uses_dma) {
if (hcd_uses_dma(hcd)) {
if (urb->num_sgs) {
int n;

2
drivers/usb/dwc2/hcd.c
View File

@ -4608,7 +4608,7 @@ static int _dwc2_hcd_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
buf = urb->transfer_buffer;
if (hcd->self.uses_dma) {
if (hcd_uses_dma(hcd)) {
if (!buf && (urb->transfer_dma & 3)) {
dev_err(hsotg->dev,
"%s: unaligned transfer with no transfer_buffer",

2
include/linux/usb.h
View File

@ -1457,7 +1457,7 @@ typedef void (*usb_complete_t)(struct urb *);
* field rather than determining a dma address themselves.
*
* Note that transfer_buffer must still be set if the controller
* does not support DMA (as indicated by bus.uses_dma) and when talking
* does not support DMA (as indicated by hcd_uses_dma()) and when talking
* to root hub. If you have to trasfer between highmem zone and the device
* on such controller, create a bounce buffer or bail out with an error.
* If transfer_buffer cannot be set (is in highmem) and the controller is DMA

3
include/linux/usb/hcd.h
View File

@ -422,6 +422,9 @@ static inline bool hcd_periodic_completion_in_progress(struct usb_hcd *hcd,
return hcd->high_prio_bh.completing_ep == ep;
}
#define hcd_uses_dma(hcd) \
(IS_ENABLED(CONFIG_HAS_DMA) && (hcd)->self.uses_dma)
extern int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb);
extern int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
int status);