Messages in this thread Patch in this message | | | Date | Tue, 31 Oct 2023 03:54:02 +0000 | Subject | [PATCH] usb: gadget: Support transfers from device memory | From | Manan Aurora <> |
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USB gadget stack only supports usb_request objects that point to buffers located in memory. Support use cases where data is transferred from physical addresses in device mmio regions
Added a bit "pre_mapped" to usb_request to bypass dma_map_single and dma_map_sg for such requests
The caller must determine the dma address for the request before queuing it
Signed-off-by: Manan Aurora <maurora@google.com> --- drivers/usb/gadget/udc/core.c | 4 ++-- include/linux/usb/gadget.h | 1 + 2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index ded9531f141b..236165ba08f4 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -900,7 +900,7 @@ EXPORT_SYMBOL_GPL(usb_gadget_activate); int usb_gadget_map_request_by_dev(struct device *dev, struct usb_request *req, int is_in) { - if (req->length == 0) + if (req->pre_mapped || req->length == 0) return 0; if (req->num_sgs) { @@ -948,7 +948,7 @@ EXPORT_SYMBOL_GPL(usb_gadget_map_request); void usb_gadget_unmap_request_by_dev(struct device *dev, struct usb_request *req, int is_in) { - if (req->length == 0) + if (req->pre_mapped || req->length == 0) return; if (req->num_mapped_sgs) { diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index a771ccc038ac..6bc035439098 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -111,6 +111,7 @@ struct usb_request { unsigned zero:1; unsigned short_not_ok:1; unsigned dma_mapped:1; + unsigned pre_mapped:1; void (*complete)(struct usb_ep *ep, struct usb_request *req); -- 2.42.0.820.g83a721a137-goog
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