Message-ID: <AM0PR06MB5602BA92755999C69F38D1E297A90@AM0PR06MB5602.eurprd06.prod.outlook.com>
Date:   Thu, 6 Dec 2018 23:09:37 +0000
From:   Maynard CABIENTE <maynard.cabiente@...itan.com>
To:     Minas Harutyunyan <minas.harutyunyan@...opsys.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: RE: [PATCH] usb: dwc2: Revert "usb: dwc2: Disable all EP's on
 disconnect"

Hi Minas,

I tried your new patch on top of the other 2 patches for a couple of days now and I do not see the issue that Marek encountered. Of course, I did not see it also on the original two patches you created. I also do not see the original FIFO map warning issue that I have with all 3 patches intact.

However, I do have 2 issues that I'm not certain if this was created by these patches or already there in the beginning (prior to applying all your 3 patches). Again my system is an Altera Cyclone V SoC FPGA running on linux kernel 4.14.44. We are using both USB HID and mass storage gadget. The 2 issues may occur when USB mass storage is in use.

First issue I am encountering is (sometimes continuous) multiple USB resets occurring when using the USB mass storage gadget. When I used a USB sniffer (Ellisys) to see the cause of the USB reset, I am seeing an out-of-order USB mass storage transfer. That is, the transfer is supposed to follow (1) Command Block Wrapper (CBW), (2) Data, (3) Command Status Wrapper (CSW). When the USB reset occur, I see either one of the following prior to the reset:

- Data comes in first before the CBW
- Request Sense CBW, Data then no CSW followed by a Test Unit Ready CBW and Data with no CSW again
- CBW, CSW and then Data

Second issue that I see is a deadlock then my system will reboot. This happens when I re-enable the USB mass storage gadget after disabling it before.

The two issues may not be related to your changes. I will revert back all your patches to see if the issue is present already. However, I will hit my original problem when I don't apply at least 2 of your patches, which is the WARNING: CPU: 0 PID: 0 at ../drivers/usb/dwc2/gadget.c:300 dwc2_hsotg_init_fifo+0x34/0x1b4.

I will get back to you once I test it without your patches.

Regards,
Maynard

On Tuesday, December 04, 2018 7:34 AM, Minas Harutyunyan wrote:
> On 11/23/2018 6:43 PM, Dan Carpenter wrote:
> > Ugh...  We also had a long thread about the v2 patch but it turns out
> > the list was not CC'd.  I should have checked for that.
> >
> > You have to pass a flag to say if the caller holds the lock or not...
> >
> > regards,
> > dan carpenter
> >
>
> Hi Dan, Marek, Maynard,
>
> Could you please apply bellow patch over follow patches:
>
> dccf1bad4be7 usb: dwc2: Disable all EP's on disconnect
> 6f774b501928 usb: dwc2: Fix ep disable spinlock flow.
>
> Please review and test. Feedback is appreciated :-)
>
> diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index
> 8eb25e3597b0..db438d13c36a 100644
> --- a/drivers/usb/dwc2/gadget.c
> +++ b/drivers/usb/dwc2/gadget.c
> @@ -3165,8 +3165,6 @@ static void kill_all_requests(struct dwc2_hsotg
> *hsotg,
>                  dwc2_hsotg_txfifo_flush(hsotg, ep->fifo_index);
>   }
>
> -static int dwc2_hsotg_ep_disable(struct usb_ep *ep);
> -
>   /**
>    * dwc2_hsotg_disconnect - disconnect service
>    * @hsotg: The device state.
> @@ -3185,12 +3183,13 @@ void dwc2_hsotg_disconnect(struct dwc2_hsotg
> *hsotg)
>          hsotg->connected = 0;
>          hsotg->test_mode = 0;
>
> -       /* all endpoints should be shutdown */
>          for (ep = 0; ep < hsotg->num_of_eps; ep++) {
>                  if (hsotg->eps_in[ep])
> -                       dwc2_hsotg_ep_disable(&hsotg->eps_in[ep]->ep);
> +                       kill_all_requests(hsotg, hsotg->eps_in[ep],
> +                                                         -ESHUTDOWN);
>                  if (hsotg->eps_out[ep])
> -                       dwc2_hsotg_ep_disable(&hsotg->eps_out[ep]->ep);
> +                       kill_all_requests(hsotg, hsotg->eps_out[ep],
> +                                                         -ESHUTDOWN);
>          }
>
>          call_gadget(hsotg, disconnect); @@ -3234,6 +3233,8 @@ static void
> dwc2_hsotg_irq_fifoempty(struct dwc2_hsotg *hsotg, bool periodic)
>                          GINTSTS_PTXFEMP |  \
>                          GINTSTS_RXFLVL)
>
> +static int dwc2_hsotg_ep_disable(struct usb_ep *ep);
> +
>   /**
>    * dwc2_hsotg_core_init - issue softreset to the core
>    * @hsotg: The device state
> @@ -3258,12 +3259,14 @@ void dwc2_hsotg_core_init_disconnected(struct
> dwc2_hsotg *hsotg,
>                          return;
>          } else {
>                  /* all endpoints should be shutdown */
> +               spin_unlock(&hsotg->lock);
>                  for (ep = 1; ep < hsotg->num_of_eps; ep++) {
>                          if (hsotg->eps_in[ep])
>
> dwc2_hsotg_ep_disable(&hsotg->eps_in[ep]->ep);
>                          if (hsotg->eps_out[ep])
>
> dwc2_hsotg_ep_disable(&hsotg->eps_out[ep]->ep);
>                  }
> +               spin_lock(&hsotg->lock);
>          }
>
>          /*
> @@ -4072,7 +4075,6 @@ static int dwc2_hsotg_ep_disable(struct usb_ep
> *ep)
>          unsigned long flags;
>          u32 epctrl_reg;
>          u32 ctrl;
> -       int locked;
>
>          dev_dbg(hsotg->dev, "%s(ep %p)\n", __func__, ep);
>
> @@ -4088,7 +4090,7 @@ static int dwc2_hsotg_ep_disable(struct usb_ep
> *ep)
>
>          epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index);
>
> -       locked = spin_trylock_irqsave(&hsotg->lock, flags);
> +       spin_lock_irqsave(&hsotg->lock, flags);
>
>          ctrl = dwc2_readl(hsotg, epctrl_reg);
>
> @@ -4112,8 +4114,7 @@ static int dwc2_hsotg_ep_disable(struct usb_ep
> *ep)
>          hs_ep->fifo_index = 0;
>          hs_ep->fifo_size = 0;
>
> -       if (locked)
> -               spin_unlock_irqrestore(&hsotg->lock, flags);
> +       spin_unlock_irqrestore(&hsotg->lock, flags);
>
>          return 0;
>   }
>
> Thanks,
> Minas

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