| Message ID | 20211021175807.23826-1-jackp@codeaurora.org (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [1/2] usb: dwc3: gadget: Skip resizing EP's TX FIFO if already resized | expand |
Sorry, disregard this. Forgot to update the patch subject with V3. Resending... On Thu, Oct 21, 2021 at 10:58:06AM -0700, Jack Pham wrote: > Some functions may dynamically enable and disable their endpoints > regularly throughout their operation, particularly when Set Interface > is employed to switch between Alternate Settings. For instance the > UAC2 function has its respective endpoints for playback & capture > associated with AltSetting 1, in which case those endpoints would not > get enabled until the host activates the AltSetting. And they > conversely become disabled when the interfaces' AltSetting 0 is > chosen. > > With the DWC3 FIFO resizing algorithm recently added, every > usb_ep_enable() call results in a call to resize that EP's TXFIFO, > but if the same endpoint is enabled again and again, this incorrectly > leads to FIFO RAM allocation exhaustion as the mechanism did not > account for the possibility that endpoints can be re-enabled many > times. > > Example log splat: > > dwc3 a600000.dwc3: Fifosize(3717) > RAM size(3462) ep3in depth:217973127 > configfs-gadget gadget: u_audio_start_capture:521 Error! > dwc3 a600000.dwc3: request 000000000be13e18 was not queued to ep3in > > Add another bit DWC3_EP_TXFIFO_RESIZED to dep->flags to keep track of > whether an EP had already been resized in the current configuration. > If so, bail out of dwc3_gadget_resize_tx_fifos() to avoid the > calculation error resulting from accumulating the EP's FIFO depth > repeatedly. This flag is retained across multiple ep_disable() and > ep_enable() calls and is cleared when GTXFIFOSIZn is reset in > dwc3_gadget_clear_tx_fifos() upon receiving the next Set Config. > > Fixes: 9f607a309fbe9 ("usb: dwc3: Resize TX FIFOs to meet EP bursting requirements") > Reviewed-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com> > Signed-off-by: Jack Pham <jackp@codeaurora.org> > --- > v3: Fixed macro definition alignment; added Thinh's reviewed-by. > > v2: Added explicit flag to dep->flags and check that instead of directly > reading the GTXFIFOSIZn register. > > drivers/usb/dwc3/core.h | 1 + > drivers/usb/dwc3/gadget.c | 8 +++++++- > 2 files changed, 8 insertions(+), 1 deletion(-) > > diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h > index 5612bfdf37da..0c100901a784 100644 > --- a/drivers/usb/dwc3/core.h > +++ b/drivers/usb/dwc3/core.h > @@ -723,6 +723,7 @@ struct dwc3_ep { > #define DWC3_EP_FORCE_RESTART_STREAM BIT(9) > #define DWC3_EP_FIRST_STREAM_PRIMED BIT(10) > #define DWC3_EP_PENDING_CLEAR_STALL BIT(11) > +#define DWC3_EP_TXFIFO_RESIZED BIT(12) > > /* This last one is specific to EP0 */ > #define DWC3_EP0_DIR_IN BIT(31) > diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c > index 4519d06c9ca2..ed97e47d3261 100644 > --- a/drivers/usb/dwc3/gadget.c > +++ b/drivers/usb/dwc3/gadget.c > @@ -702,6 +702,7 @@ void dwc3_gadget_clear_tx_fifos(struct dwc3 *dwc) > DWC31_GTXFIFOSIZ_TXFRAMNUM; > > dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(num >> 1), size); > + dep->flags &= ~DWC3_EP_TXFIFO_RESIZED; > } > dwc->num_ep_resized = 0; > } > @@ -747,6 +748,10 @@ static int dwc3_gadget_resize_tx_fifos(struct dwc3_ep *dep) > if (!usb_endpoint_dir_in(dep->endpoint.desc) || dep->number <= 1) > return 0; > > + /* bail if already resized */ > + if (dep->flags & DWC3_EP_TXFIFO_RESIZED) > + return 0; > + > ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7); > > if ((dep->endpoint.maxburst > 1 && > @@ -807,6 +812,7 @@ static int dwc3_gadget_resize_tx_fifos(struct dwc3_ep *dep) > } > > dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(dep->number >> 1), fifo_size); > + dep->flags |= DWC3_EP_TXFIFO_RESIZED; > dwc->num_ep_resized++; > > return 0; > @@ -995,7 +1001,7 @@ static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep) > > dep->stream_capable = false; > dep->type = 0; > - dep->flags = 0; > + dep->flags &= DWC3_EP_TXFIFO_RESIZED; > > return 0; > } > -- > 2.24.0 >
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 5612bfdf37da..0c100901a784 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -723,6 +723,7 @@ struct dwc3_ep { #define DWC3_EP_FORCE_RESTART_STREAM BIT(9) #define DWC3_EP_FIRST_STREAM_PRIMED BIT(10) #define DWC3_EP_PENDING_CLEAR_STALL BIT(11) +#define DWC3_EP_TXFIFO_RESIZED BIT(12) /* This last one is specific to EP0 */ #define DWC3_EP0_DIR_IN BIT(31) diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 4519d06c9ca2..ed97e47d3261 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -702,6 +702,7 @@ void dwc3_gadget_clear_tx_fifos(struct dwc3 *dwc) DWC31_GTXFIFOSIZ_TXFRAMNUM; dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(num >> 1), size); + dep->flags &= ~DWC3_EP_TXFIFO_RESIZED; } dwc->num_ep_resized = 0; } @@ -747,6 +748,10 @@ static int dwc3_gadget_resize_tx_fifos(struct dwc3_ep *dep) if (!usb_endpoint_dir_in(dep->endpoint.desc) || dep->number <= 1) return 0; + /* bail if already resized */ + if (dep->flags & DWC3_EP_TXFIFO_RESIZED) + return 0; + ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7); if ((dep->endpoint.maxburst > 1 && @@ -807,6 +812,7 @@ static int dwc3_gadget_resize_tx_fifos(struct dwc3_ep *dep) } dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(dep->number >> 1), fifo_size); + dep->flags |= DWC3_EP_TXFIFO_RESIZED; dwc->num_ep_resized++; return 0; @@ -995,7 +1001,7 @@ static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep) dep->stream_capable = false; dep->type = 0; - dep->flags = 0; + dep->flags &= DWC3_EP_TXFIFO_RESIZED; return 0; }
Some functions may dynamically enable and disable their endpoints regularly throughout their operation, particularly when Set Interface is employed to switch between Alternate Settings. For instance the UAC2 function has its respective endpoints for playback & capture associated with AltSetting 1, in which case those endpoints would not get enabled until the host activates the AltSetting. And they conversely become disabled when the interfaces' AltSetting 0 is chosen. With the DWC3 FIFO resizing algorithm recently added, every usb_ep_enable() call results in a call to resize that EP's TXFIFO, but if the same endpoint is enabled again and again, this incorrectly leads to FIFO RAM allocation exhaustion as the mechanism did not account for the possibility that endpoints can be re-enabled many times. Example log splat: dwc3 a600000.dwc3: Fifosize(3717) > RAM size(3462) ep3in depth:217973127 configfs-gadget gadget: u_audio_start_capture:521 Error! dwc3 a600000.dwc3: request 000000000be13e18 was not queued to ep3in Add another bit DWC3_EP_TXFIFO_RESIZED to dep->flags to keep track of whether an EP had already been resized in the current configuration. If so, bail out of dwc3_gadget_resize_tx_fifos() to avoid the calculation error resulting from accumulating the EP's FIFO depth repeatedly. This flag is retained across multiple ep_disable() and ep_enable() calls and is cleared when GTXFIFOSIZn is reset in dwc3_gadget_clear_tx_fifos() upon receiving the next Set Config. Fixes: 9f607a309fbe9 ("usb: dwc3: Resize TX FIFOs to meet EP bursting requirements") Reviewed-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com> Signed-off-by: Jack Pham <jackp@codeaurora.org> --- v3: Fixed macro definition alignment; added Thinh's reviewed-by. v2: Added explicit flag to dep->flags and check that instead of directly reading the GTXFIFOSIZn register. drivers/usb/dwc3/core.h | 1 + drivers/usb/dwc3/gadget.c | 8 +++++++- 2 files changed, 8 insertions(+), 1 deletion(-)