From: Felipe Balbi <balbi@kernel.org>
To: Anurag Kumar Vulisha <anuragku@xilinx.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Shuah Khan <shuah@kernel.org>,
Alan Stern <stern@rowland.harvard.edu>,
Johan Hovold <johan@kernel.org>,
Jaejoong Kim <climbbb.kim@gmail.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Roger Quadros <rogerq@ti.com>,
Manu Gautam <mgautam@codeaurora.org>,
"martin.petersen\@oracle.com" <martin.petersen@oracle.com>,
Bart Van Assche <bvanassche@acm.org>,
Mike Christie <mchristi@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
Colin Ian King <colin.king@canonical.com>
Cc: "linux-usb\@vger.kernel.org" <linux-usb@vger.kernel.org>,
"linux-kernel\@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"v.anuragkumar\@gmail.com" <v.anuragkumar@gmail.com>,
Thinh Nguyen <thinhn@synopsys.com>,
Tejas Joglekar <tejas.joglekar@synopsys.com>,
Ajay Yugalkishore Pandey <APANDEY@xilinx.com>
Subject: RE: [PATCH v7 09/10] usb: dwc3: Check for IOC/LST bit in both event->status and TRB->ctrl fields
Date: Mon, 10 Dec 2018 08:54:13 +0200 [thread overview]
Message-ID: <87pnu927oq.fsf@linux.intel.com> (raw)
In-Reply-To: <BL0PR02MB56331B2ECFFEB96A99936C32A7AB0@BL0PR02MB5633.namprd02.prod.outlook.com>
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Hi,
Anurag Kumar Vulisha <anuragku@xilinx.com> writes:
> HI Felipe,
>
>>-----Original Message-----
>>From: Felipe Balbi [mailto:balbi@kernel.org]
>>Sent: Friday, December 07, 2018 11:42 AM
>>To: Anurag Kumar Vulisha <anuragku@xilinx.com>; Greg Kroah-Hartman
>><gregkh@linuxfoundation.org>; Shuah Khan <shuah@kernel.org>; Alan Stern
>><stern@rowland.harvard.edu>; Johan Hovold <johan@kernel.org>; Jaejoong Kim
>><climbbb.kim@gmail.com>; Benjamin Herrenschmidt <benh@kernel.crashing.org>;
>>Roger Quadros <rogerq@ti.com>; Manu Gautam <mgautam@codeaurora.org>;
>>martin.petersen@oracle.com; Bart Van Assche <bvanassche@acm.org>; Mike
>>Christie <mchristi@redhat.com>; Matthew Wilcox <willy@infradead.org>; Colin Ian
>>King <colin.king@canonical.com>
>>Cc: linux-usb@vger.kernel.org; linux-kernel@vger.kernel.org;
>>v.anuragkumar@gmail.com; Thinh Nguyen <thinhn@synopsys.com>; Tejas Joglekar
>><tejas.joglekar@synopsys.com>; Ajay Yugalkishore Pandey <APANDEY@xilinx.com>
>>Subject: RE: [PATCH v7 09/10] usb: dwc3: Check for IOC/LST bit in both event->status
>>and TRB->ctrl fields
>>
>>
>>Hi,
>>
>>Anurag Kumar Vulisha <anuragku@xilinx.com> writes:
>>>>> @@ -2286,7 +2286,12 @@ static int
>>>>dwc3_gadget_ep_reclaim_completed_trb(struct dwc3_ep *dep,
>>>>> if (event->status & DEPEVT_STATUS_SHORT && !chain)
>>>>> return 1;
>>>>>
>>>>> - if (event->status & (DEPEVT_STATUS_IOC | DEPEVT_STATUS_LST))
>>>>> + if ((event->status & DEPEVT_STATUS_IOC) &&
>>>>> + (trb->ctrl & DWC3_TRB_CTRL_IOC))
>>>>> + return 1;
>>>>
>>>>this shouldn't be necessary. According to databook, event->status
>>>>contains the bits from the completed TRB. Which means that
>>>>event->status & IOC will always be equal to trb->ctrl & IOC.
>>>>
>>> Thanks for reviewing this patch. Lets consider an example where a
>>> request has num_sgs > 0 and each sg is mapped to a TRB and the last
>>> TRB has the IOC bit set. Once the controller is done with the
>>> transfer, it generates XferInProgress for the last TRB (since IOC bit
>>> is set). As a part of trb reclaim process
>>> dwc3_gadget_ep_reclaim_trb_sg() calls
>>> dwc3_gadget_ep_reclaim_completed_trb() for req->num_sgs times. Since
>>> the event already has the IOC bit set, the loop is exited from the
>>> loop at the very first TRB and the remaining TRBs (mapped to the sglist) are left
>>unhandled.
>>> To avoid this we modified the code to exit only if both TRB & event
>>> has the IOC bit set.
>>
>>Seems like IOC case should just test for chain flag as well:
>>
>
> Okay. Along with this logic the code for updating chain bit should also be modified I guess.
not really
> Since the IOC bit is also set when there are not enough TRBs available, the code should be
> modified to not set DWC3_TRB_CTRL_CHN bit when the IOC bit is set. I will update below
> changes along with your suggestions and resend the patches.
no. Actually I don't think we're allowed to split a scatter/gather like
that. I did that quite a while ago, but I don't think we're allowed to
do so. What we should do, in that case, is not even queue that request
until we have enough for all members of the scatter/gather. But that's a
separate patch, anyway.
--
balbi
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next prev parent reply other threads:[~2018-12-10 6:54 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-01 11:13 [PATCH v7 00/10] usb: dwc3: Fix broken BULK stream support to dwc3 gadget driver Anurag Kumar Vulisha
2018-12-01 11:13 ` [PATCH v7 01/10] usb: gadget: udc: Add timer support for usb requests Anurag Kumar Vulisha
2018-12-02 16:36 ` Alan Stern
2018-12-03 10:23 ` Anurag Kumar Vulisha
2018-12-03 14:51 ` Alan Stern
2018-12-03 16:05 ` Anurag Kumar Vulisha
2018-12-03 23:08 ` Alan Stern
2018-12-04 16:18 ` Anurag Kumar Vulisha
2018-12-04 16:46 ` Alan Stern
2018-12-04 19:07 ` Anurag Kumar Vulisha
2018-12-04 19:28 ` Alan Stern
2018-12-05 15:43 ` Anurag Kumar Vulisha
2018-12-07 6:05 ` Felipe Balbi
2018-12-07 17:09 ` Alan Stern
2018-12-12 15:11 ` Anurag Kumar Vulisha
2019-01-04 14:17 ` Anurag Kumar Vulisha
2018-12-01 11:13 ` [PATCH v7 02/10] usb: gadget: function: tcm: Add timeout for stream capable endpoints Anurag Kumar Vulisha
2018-12-01 11:13 ` [PATCH v7 03/10] usb: dwc3: gadget: handle stream events Anurag Kumar Vulisha
2018-12-01 11:13 ` [PATCH v7 04/10] usb: dwc3: update stream id in depcmd Anurag Kumar Vulisha
2018-12-01 11:13 ` [PATCH v7 05/10] usb: dwc3: make controller clear transfer resources after complete Anurag Kumar Vulisha
2018-12-05 9:01 ` Felipe Balbi
2018-12-05 19:05 ` Anurag Kumar Vulisha
2018-12-01 11:13 ` [PATCH v7 06/10] usb: dwc3: don't issue no-op trb for stream capable endpoints Anurag Kumar Vulisha
2018-12-01 11:13 ` [PATCH v7 07/10] usb: dwc3: check for requests in started list " Anurag Kumar Vulisha
2018-12-01 11:13 ` [PATCH v7 08/10] usb: dwc3: Correct the logic for checking TRB full in __dwc3_prepare_one_trb() Anurag Kumar Vulisha
2018-12-01 11:13 ` [PATCH v7 09/10] usb: dwc3: Check for IOC/LST bit in both event->status and TRB->ctrl fields Anurag Kumar Vulisha
2018-12-05 9:07 ` Felipe Balbi
2018-12-05 19:01 ` Anurag Kumar Vulisha
2018-12-07 6:11 ` Felipe Balbi
2018-12-08 19:03 ` Anurag Kumar Vulisha
2018-12-10 6:54 ` Felipe Balbi [this message]
2018-12-10 8:56 ` Anurag Kumar Vulisha
2018-12-10 9:03 ` Felipe Balbi
2018-12-01 11:13 ` [PATCH v7 10/10] usb: dwc3: Check MISSED ISOC bit only for ISOC endpoints Anurag Kumar Vulisha
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