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Date: Mon, 9 Jan 2023 05:47:49 +0000
From: Pawel Laszczak <pawell@...ence.com>
To: Peter Chen <peter.chen@...nel.org>
CC: "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH] usb: cdnsp: : add scatter gather support for ISOC
endpoint
>
>On 22-12-22 04:09:34, Pawel Laszczak wrote:
>> Patch implements scatter gather support for isochronous endpoint.
>> This fix is forced by 'commit e81e7f9a0eb9
>> ("usb: gadget: uvc: add scatter gather support")'.
>> After this fix CDNSP driver stop working with UVC class.
>>
>> cc: <stable@...r.kernel.org>
>> Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence
>> USBSSP DRD Driver")
>> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
>> ---
>> drivers/usb/cdns3/cdnsp-gadget.c | 2 +-
>> drivers/usb/cdns3/cdnsp-gadget.h | 4 +-
>> drivers/usb/cdns3/cdnsp-ring.c | 110 +++++++++++++++++--------------
>> 3 files changed, 63 insertions(+), 53 deletions(-)
>>
>> diff --git a/drivers/usb/cdns3/cdnsp-gadget.c
>> b/drivers/usb/cdns3/cdnsp-gadget.c
>> index a8640516c895..e81dca0e62a8 100644
>> --- a/drivers/usb/cdns3/cdnsp-gadget.c
>> +++ b/drivers/usb/cdns3/cdnsp-gadget.c
>> @@ -382,7 +382,7 @@ int cdnsp_ep_enqueue(struct cdnsp_ep *pep, struct
>cdnsp_request *preq)
>> ret = cdnsp_queue_bulk_tx(pdev, preq);
>> break;
>> case USB_ENDPOINT_XFER_ISOC:
>> - ret = cdnsp_queue_isoc_tx_prepare(pdev, preq);
>> + ret = cdnsp_queue_isoc_tx(pdev, preq);
>> }
>>
>> if (ret)
>> diff --git a/drivers/usb/cdns3/cdnsp-gadget.h
>> b/drivers/usb/cdns3/cdnsp-gadget.h
>> index f740fa6089d8..e1b5801fdddf 100644
>> --- a/drivers/usb/cdns3/cdnsp-gadget.h
>> +++ b/drivers/usb/cdns3/cdnsp-gadget.h
>> @@ -1532,8 +1532,8 @@ void cdnsp_queue_stop_endpoint(struct
>cdnsp_device *pdev,
>> unsigned int ep_index);
>> int cdnsp_queue_ctrl_tx(struct cdnsp_device *pdev, struct
>> cdnsp_request *preq); int cdnsp_queue_bulk_tx(struct cdnsp_device
>> *pdev, struct cdnsp_request *preq); -int
>cdnsp_queue_isoc_tx_prepare(struct cdnsp_device *pdev,
>> - struct cdnsp_request *preq);
>> +int cdnsp_queue_isoc_tx(struct cdnsp_device *pdev,
>> + struct cdnsp_request *preq);
>
>Why you re-name this function?
>
>Other changes are ok for me.
>
The function cdnsp_queue_isoc_tx_prepare has been removed and replaced
with cdnsp_queue_isoc_tx. I just add declaration of this function to header file.
Before change cdnsp_queue_isoc_tx was static function.
Regards,
Pawel
>> void cdnsp_queue_configure_endpoint(struct cdnsp_device *pdev,
>> dma_addr_t in_ctx_ptr);
>> void cdnsp_queue_reset_ep(struct cdnsp_device *pdev, unsigned int
>> ep_index); diff --git a/drivers/usb/cdns3/cdnsp-ring.c
>> b/drivers/usb/cdns3/cdnsp-ring.c index b23e543b3a3d..07f6068342d4
>> 100644
>> --- a/drivers/usb/cdns3/cdnsp-ring.c
>> +++ b/drivers/usb/cdns3/cdnsp-ring.c
>> @@ -1333,6 +1333,20 @@ static int cdnsp_handle_tx_event(struct
>cdnsp_device *pdev,
>> ep_ring->dequeue, td->last_trb,
>> ep_trb_dma);
>>
>> + desc = td->preq->pep->endpoint.desc;
>> +
>> + if (ep_seg) {
>> + ep_trb = &ep_seg->trbs[(ep_trb_dma - ep_seg->dma)
>> + / sizeof(*ep_trb)];
>> +
>> + trace_cdnsp_handle_transfer(ep_ring,
>> + (struct cdnsp_generic_trb *)ep_trb);
>> +
>> + if (pep->skip && usb_endpoint_xfer_isoc(desc) &&
>> + td->last_trb != ep_trb)
>> + return -EAGAIN;
>> + }
>> +
>> /*
>> * Skip the Force Stopped Event. The event_trb(ep_trb_dma)
>> * of FSE is not in the current TD pointed by ep_ring->dequeue
>@@
>> -1347,7 +1361,6 @@ static int cdnsp_handle_tx_event(struct cdnsp_device
>*pdev,
>> goto cleanup;
>> }
>>
>> - desc = td->preq->pep->endpoint.desc;
>> if (!ep_seg) {
>> if (!pep->skip || !usb_endpoint_xfer_isoc(desc)) {
>> /* Something is busted, give up! */ @@ -
>1374,12 +1387,6 @@ static
>> int cdnsp_handle_tx_event(struct cdnsp_device *pdev,
>> goto cleanup;
>> }
>>
>> - ep_trb = &ep_seg->trbs[(ep_trb_dma - ep_seg->dma)
>> - / sizeof(*ep_trb)];
>> -
>> - trace_cdnsp_handle_transfer(ep_ring,
>> - (struct cdnsp_generic_trb *)ep_trb);
>> -
>> if (cdnsp_trb_is_noop(ep_trb))
>> goto cleanup;
>>
>> @@ -1726,11 +1733,6 @@ static unsigned int count_sg_trbs_needed(struct
>cdnsp_request *preq)
>> return num_trbs;
>> }
>>
>> -static unsigned int count_isoc_trbs_needed(struct cdnsp_request
>> *preq) -{
>> - return cdnsp_count_trbs(preq->request.dma, preq->request.length);
>> -}
>> -
>> static void cdnsp_check_trb_math(struct cdnsp_request *preq, int
>> running_total) {
>> if (running_total != preq->request.length) @@ -2192,28 +2194,48 @@
>> static unsigned int }
>>
>> /* Queue function isoc transfer */
>> -static int cdnsp_queue_isoc_tx(struct cdnsp_device *pdev,
>> - struct cdnsp_request *preq)
>> +int cdnsp_queue_isoc_tx(struct cdnsp_device *pdev,
>> + struct cdnsp_request *preq)
>> {
>> - int trb_buff_len, td_len, td_remain_len, ret;
>> + unsigned int trb_buff_len, td_len, td_remain_len, block_len;
>> unsigned int burst_count, last_burst_pkt;
>> unsigned int total_pkt_count, max_pkt;
>> struct cdnsp_generic_trb *start_trb;
>> + struct scatterlist *sg = NULL;
>> bool more_trbs_coming = true;
>> struct cdnsp_ring *ep_ring;
>> + unsigned int num_sgs = 0;
>> int running_total = 0;
>> u32 field, length_field;
>> + u64 addr, send_addr;
>> int start_cycle;
>> int trbs_per_td;
>> - u64 addr;
>> - int i;
>> + int i, sent_len, ret;
>>
>> ep_ring = preq->pep->ring;
>> +
>> + td_len = preq->request.length;
>> +
>> + if (preq->request.num_sgs) {
>> + num_sgs = preq->request.num_sgs;
>> + sg = preq->request.sg;
>> + addr = (u64)sg_dma_address(sg);
>> + block_len = sg_dma_len(sg);
>> + trbs_per_td = count_sg_trbs_needed(preq);
>> + } else {
>> + addr = (u64)preq->request.dma;
>> + block_len = td_len;
>> + trbs_per_td = count_trbs_needed(preq);
>> + }
>> +
>> + ret = cdnsp_prepare_transfer(pdev, preq, trbs_per_td);
>> + if (ret)
>> + return ret;
>> +
>> start_trb = &ep_ring->enqueue->generic;
>> start_cycle = ep_ring->cycle_state;
>> - td_len = preq->request.length;
>> - addr = (u64)preq->request.dma;
>> td_remain_len = td_len;
>> + send_addr = addr;
>>
>> max_pkt = usb_endpoint_maxp(preq->pep->endpoint.desc);
>> total_pkt_count = DIV_ROUND_UP(td_len, max_pkt); @@ -2225,11
>+2247,6
>> @@ static int cdnsp_queue_isoc_tx(struct cdnsp_device *pdev,
>> burst_count = cdnsp_get_burst_count(pdev, preq, total_pkt_count);
>> last_burst_pkt = cdnsp_get_last_burst_packet_count(pdev, preq,
>> total_pkt_count);
>> - trbs_per_td = count_isoc_trbs_needed(preq);
>> -
>> - ret = cdnsp_prepare_transfer(pdev, preq, trbs_per_td);
>> - if (ret)
>> - goto cleanup;
>>
>> /*
>> * Set isoc specific data for the first TRB in a TD.
>> @@ -2248,6 +2265,7 @@ static int cdnsp_queue_isoc_tx(struct
>> cdnsp_device *pdev,
>>
>> /* Calculate TRB length. */
>> trb_buff_len = TRB_BUFF_LEN_UP_TO_BOUNDARY(addr);
>> + trb_buff_len = min(trb_buff_len, block_len);
>> if (trb_buff_len > td_remain_len)
>> trb_buff_len = td_remain_len;
>>
>> @@ -2256,7 +2274,8 @@ static int cdnsp_queue_isoc_tx(struct cdnsp_device
>*pdev,
>> trb_buff_len, td_len, preq,
>> more_trbs_coming, 0);
>>
>> - length_field = TRB_LEN(trb_buff_len) | TRB_INTR_TARGET(0);
>> + length_field = TRB_LEN(trb_buff_len) |
>TRB_TD_SIZE(remainder) |
>> + TRB_INTR_TARGET(0);
>>
>> /* Only first TRB is isoc, overwrite otherwise. */
>> if (i) {
>> @@ -2281,12 +2300,27 @@ static int cdnsp_queue_isoc_tx(struct
>cdnsp_device *pdev,
>> }
>>
>> cdnsp_queue_trb(pdev, ep_ring, more_trbs_coming,
>> - lower_32_bits(addr), upper_32_bits(addr),
>> + lower_32_bits(send_addr),
>upper_32_bits(send_addr),
>> length_field, field);
>>
>> running_total += trb_buff_len;
>> addr += trb_buff_len;
>> td_remain_len -= trb_buff_len;
>> +
>> + sent_len = trb_buff_len;
>> + while (sg && sent_len >= block_len) {
>> + /* New sg entry */
>> + --num_sgs;
>> + sent_len -= block_len;
>> + if (num_sgs != 0) {
>> + sg = sg_next(sg);
>> + block_len = sg_dma_len(sg);
>> + addr = (u64)sg_dma_address(sg);
>> + addr += sent_len;
>> + }
>> + }
>> + block_len -= sent_len;
>> + send_addr = addr;
>> }
>>
>> /* Check TD length */
>> @@ -2324,30 +2358,6 @@ static int cdnsp_queue_isoc_tx(struct
>cdnsp_device *pdev,
>> return ret;
>> }
>>
>> -int cdnsp_queue_isoc_tx_prepare(struct cdnsp_device *pdev,
>> - struct cdnsp_request *preq)
>> -{
>> - struct cdnsp_ring *ep_ring;
>> - u32 ep_state;
>> - int num_trbs;
>> - int ret;
>> -
>> - ep_ring = preq->pep->ring;
>> - ep_state = GET_EP_CTX_STATE(preq->pep->out_ctx);
>> - num_trbs = count_isoc_trbs_needed(preq);
>> -
>> - /*
>> - * Check the ring to guarantee there is enough room for the whole
>> - * request. Do not insert any td of the USB Request to the ring if the
>> - * check failed.
>> - */
>> - ret = cdnsp_prepare_ring(pdev, ep_ring, ep_state, num_trbs,
>GFP_ATOMIC);
>> - if (ret)
>> - return ret;
>> -
>> - return cdnsp_queue_isoc_tx(pdev, preq);
>> -}
>> -
>> /**** Command Ring Operations ****/
>> /*
>> * Generic function for queuing a command TRB on the command ring.
>> --
>> 2.25.1
>>
>
>--
>
>Thanks,
>Peter Chen
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