usb: dwc3: gadget: Misc fixes and cleanup
Subsystems (3)
Thinh Nguyen
maintainercover usb: dwc3: gadget: Misc fixes and cleanup
This series contains miscellaneous fixes and cleanup including the clearing of the ep0 flags and handling of SG for dwc3.
Thinh Nguyen (5):
usb: dwc3: ep0: Don't clear ep0 DWC3_EP_TRANSFER_STARTED
usb: dwc3: gadget: Fix checking for number of TRBs left
usb: dwc3: gadget: Fix looping of queued SG entries
usb: dwc3: gadget: Cleanup SG handling
usb: dwc3: gadget: Remove dwc3_request->needs_extra_trb
drivers/usb/dwc3/core.h | 6 ---- drivers/usb/dwc3/ep0.c | 2 +- drivers/usb/dwc3/gadget.c | 65 ++++++++++++--------------------------- 3 files changed, 21 insertions(+), 52 deletions(-)
base-commit: 528ea1aca24fba5616f397d43ccb2de99d2a41d7
Signature · 1 line
2.28.0
Thinh Nguyen
maintainerPATCH 1/5 usb: dwc3: ep0: Don't clear ep0 DWC3_EP_TRANSFER_STARTED
The driver cannot issue the End Transfer command to the SETUP transfer. Don't clear DWC3_EP_TRANSFER_STARTED flag to make sure that the driver won't send Start Transfer command again, which can cause no-resource error. For example this can occur if the host issues a reset to the device.
--- drivers/usb/dwc3/ep0.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
drivers/usb/dwc3/ep0.c +1 -1
@@ -232,7 +232,7 @@ void dwc3_ep0_stall_and_restart(struct dwc3 *dwc)/* stall is always issued on EP0 */ dep = dwc->eps[0 ];__dwc3_gadget_ep_set_halt (dep,1 , false); - dep->flags &=DWC3_EP_RESOURCE_ALLOCATED ; + dep->flags &=DWC3_EP_RESOURCE_ALLOCATED |DWC3_EP_TRANSFER_STARTED ; dep->flags |=DWC3_EP_ENABLED ; dwc->delayed_status = false;
Signature · 1 line
2.28.0
Thinh Nguyen
maintainerPATCH 2/5 usb: dwc3: gadget: Fix checking for number of TRBs left
In reply to Thinh NguyenThe check whether the TRB ring is full or empty in dwc3_calc_trbs_left() is insufficient. It assumes there are active TRBs if there's any request in the started_list. However, that's not the case for requests with a large SG list.
That is, if we have a single usb request that requires more TRBs than the total TRBs in the TRB ring, the queued TRBs will be available when all the TRBs in the ring are completed. But the request is only partially completed and remains in the started_list. With the current logic, the TRB ring is empty, but dwc3_calc_trbs_left() returns 0.
Fix this by additionally checking for the request->num_trbs for active TRB count.
--- drivers/usb/dwc3/gadget.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
drivers/usb/dwc3/gadget.c +6 -3
@@ -1230,11 +1230,14 @@ static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)* pending to be processed by the driver. */ if (dep->trb_enqueue == dep->trb_dequeue) { +struct dwc3_request *req; +/* -* If there is any request remained in the started_list at -* this point, that means there is no TRB available. +* If there is any request remained in the started_list with +* active TRBs at this point, then there is no TRB available. */ -if (!list_empty (&dep->started_list)) + req =next_request (&dep->started_list); +if (req && req->num_trbs)return 0 ;return DWC3_TRB_NUM -1 ;
Signature · 1 line
2.28.0
Thinh Nguyen
maintainerPATCH 3/5 usb: dwc3: gadget: Fix looping of queued SG entries
In reply to Thinh NguyenThe dwc3_request->num_queued_sgs is decremented on completion. If a partially completed request is handled, then the dwc3_request->num_queued_sgs no longer reflects the total number of num_queued_sgs (it would be cleared).
Correctly check the number of request SG entries remained to be prepare and queued. Failure to do this may cause null pointer dereference when accessing non-existent SG entry.
--- drivers/usb/dwc3/gadget.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
drivers/usb/dwc3/gadget.c +3 -3
@@ -1470,8 +1470,8 @@ static int dwc3_prepare_trbs_sg(struct dwc3_ep *dep,struct scatterlist *s;int i;unsigned int length = req->request.length; -unsigned int remaining = req->request.num_mapped_sgs - - req->num_queued_sgs; +unsigned int remaining = req->num_pending_sgs; +unsigned int num_queued_sgs = req->request.num_mapped_sgs - remaining;unsigned int num_trbs = req->num_trbs;bool needs_extra_trb =dwc3_needs_extra_trb (dep, req);
@@ -1479,7 +1479,7 @@ static int dwc3_prepare_trbs_sg(struct dwc3_ep *dep,* If we resume preparing the request, then get the remaining length of * the request and resume where we left off. */ -for_each_sg (req->request.sg, s, req->num_queued_sgs, i) +for_each_sg (req->request.sg, s, num_queued_sgs, i) length -=sg_dma_len (s);for_each_sg (sg, s, remaining, i) {
Signature · 1 line
2.28.0
Thinh Nguyen
maintainerPATCH 4/5 usb: dwc3: gadget: Cleanup SG handling
In reply to Thinh NguyenThe current logic in dwc3 driver is tracking req->num_queued_sgs and req->sg. But they can be checked base on the num_pending_sgs and num_trbs. They are redundant and can complicate the SG logic. Let's remove them.
--- drivers/usb/dwc3/core.h | 3 --- drivers/usb/dwc3/gadget.c | 42 +++++++-------------------------------- 2 files changed, 7 insertions(+), 38 deletions(-)
drivers/usb/dwc3/core.h +0 -3
@@ -941,10 +941,8 @@ struct dwc3_hwparams {* @request: struct usb_request to be transferred * @list: a list_head used for request queueing * @dep: struct dwc3_ep owning this request -* @sg: pointer to first incomplete sg * @start_sg: pointer to the sg which should be queued next * @num_pending_sgs: counter to pending sgs -* @num_queued_sgs: counter to the number of sgs which already got queued * @remaining: amount of data remaining * @status: internal dwc3 request status tracking * @epnum: endpoint number to which this request refers
@@ -964,7 +962,6 @@ struct dwc3_request {struct scatterlist *start_sg;unsigned int num_pending_sgs; -unsigned int num_queued_sgs;unsigned int remaining;unsigned int status;
drivers/usb/dwc3/gadget.c +7 -35
86 lines not on this page · raw message
Signature · 1 line
2.28.0
Thinh Nguyen
maintainerPATCH 5/5 usb: dwc3: gadget: Remove dwc3_request->needs_extra_trb
In reply to Thinh NguyenNow that we track TRBs base on request->num_trbs on reclaim, we don't need to save the dwc3_request->needs_extra_trb check. Remove it.
--- drivers/usb/dwc3/core.h | 3 --- drivers/usb/dwc3/gadget.c | 8 ++++---- 2 files changed, 4 insertions(+), 7 deletions(-)
drivers/usb/dwc3/core.h +0 -3
@@ -949,8 +949,6 @@ struct dwc3_hwparams {* @trb: pointer to struct dwc3_trb * @trb_dma: DMA address of @trb * @num_trbs: number of TRBs used by this request -* @needs_extra_trb: true when request needs one extra TRB (either due to ZLP -* or unaligned OUT) * @direction: IN or OUT direction flag * @mapped: true when request has been dma-mapped */
@@ -979,7 +977,6 @@ struct dwc3_request {unsigned int num_trbs; - unsigned int needs_extra_trb:1; unsigned int direction:1; unsigned int mapped:1; };
drivers/usb/dwc3/gadget.c +4 -4
@@ -197,7 +197,6 @@ static void dwc3_gadget_del_and_unmap_request(struct dwc3_ep *dep,list_del (&req->list); req->remaining =0 ; - req->needs_extra_trb = false; req->num_trbs =0 ;if (req->request.status == -EINPROGRESS )
@@ -1440,6 +1439,7 @@ static int dwc3_prepare_last_sg(struct dwc3_ep *dep,unsigned int maxp =usb_endpoint_maxp (dep->endpoint.desc);unsigned int rem = req->request.length % maxp;unsigned int num_trbs =1 ; +bool needs_extra_trb;if (dwc3_needs_extra_trb (dep, req)) num_trbs++;
@@ -1447,15 +1447,15 @@ static int dwc3_prepare_last_sg(struct dwc3_ep *dep,if (dwc3_calc_trbs_left (dep) < num_trbs)return 0 ; - req->needs_extra_trb = num_trbs >1 ; + needs_extra_trb = num_trbs >1 ;/* Prepare a normal TRB */ if (req->direction || req->request.length)dwc3_prepare_one_trb (dep, req, entry_length, - req->needs_extra_trb, node, false, false); + needs_extra_trb, node, false, false);/* Prepare extra TRBs for ZLP and MPS OUT transfer alignment */ -if ((!req->direction && !req->request.length) || req->needs_extra_trb) +if ((!req->direction && !req->request.length) || needs_extra_trb)dwc3_prepare_one_trb (dep, req, req->direction ?0 : maxp - rem, false,1 , true, false);
Signature · 1 line
2.28.0