* [PATCH v9 1/1] usb: cdns3: allocate TX FIFO size according to composite EP number
@ 2022-05-09 16:40 Frank Li
2022-05-14 4:57 ` Peter Chen
0 siblings, 1 reply; 2+ messages in thread
From: Frank Li @ 2022-05-09 16:40 UTC (permalink / raw)
To: peter.chen, pawell, rogerq, a-govindraju, linux-usb, jun.li, lznuaa
Cc: gregkh, linux-kernel
Some devices have USB compositions which may require multiple endpoints.
To get better performance, need bigger CDNS3_EP_BUF_SIZE.
But bigger CDNS3_EP_BUF_SIZE may exceed total hardware FIFO size when
multiple endpoints.
By introducing the check_config() callback, calculate CDNS3_EP_BUF_SIZE.
Move CDNS3_EP_BUF_SIZE into cnds3_device: ep_buf_size
Combine CDNS3_EP_ISO_SS_BURST and CDNS3_EP_ISO_HS_MULT into
cnds3_device:ep_iso_burst
Using a simple algorithm to calculate ep_buf_size.
ep_buf_size = ep_iso_burst = (onchip_buffers - 2k) / (number of IN EP +
1).
Test at 8qxp:
Gadget ep_buf_size
RNDIS: 5
RNDIS+ACM: 3
Mass Storage + NCM + ACM 2
Previous CDNS3_EP_BUF_SIZE is 4, RNDIS + ACM will be failure because
exceed FIFO memory.
Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
Change from v8 to v9
fix typo in commit message
move max value check before cdns3_ep_onchip_buffer_reserve()
remove priv_dev->ep_buf_size = 1 and priv_dev->ep_iso_burst = 1;
Change from v2 to v8:
mistake pump version to v8
Change from v1 to v2:
Add safe check for mult, buffering and maxburst
drivers/usb/cdns3/cdns3-gadget.c | 47 +++++++++++++++++++++++++++++---
drivers/usb/cdns3/cdns3-gadget.h | 9 ++++--
2 files changed, 49 insertions(+), 7 deletions(-)
diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
index 1f3b4a1422126..3a3f323d9ce79 100644
--- a/drivers/usb/cdns3/cdns3-gadget.c
+++ b/drivers/usb/cdns3/cdns3-gadget.c
@@ -2050,7 +2050,7 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
u8 mult = 0;
int ret;
- buffering = CDNS3_EP_BUF_SIZE - 1;
+ buffering = priv_dev->ep_buf_size - 1;
cdns3_configure_dmult(priv_dev, priv_ep);
@@ -2069,7 +2069,7 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
break;
default:
ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_ISOC);
- mult = CDNS3_EP_ISO_HS_MULT - 1;
+ mult = priv_dev->ep_iso_burst - 1;
buffering = mult + 1;
}
@@ -2085,14 +2085,14 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
mult = 0;
max_packet_size = 1024;
if (priv_ep->type == USB_ENDPOINT_XFER_ISOC) {
- maxburst = CDNS3_EP_ISO_SS_BURST - 1;
+ maxburst = priv_dev->ep_iso_burst - 1;
buffering = (mult + 1) *
(maxburst + 1);
if (priv_ep->interval > 1)
buffering++;
} else {
- maxburst = CDNS3_EP_BUF_SIZE - 1;
+ maxburst = priv_dev->ep_buf_size - 1;
}
break;
default:
@@ -2107,6 +2107,10 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
else
priv_ep->trb_burst_size = 16;
+ mult = min_t(u8, mult, EP_CFG_MULT_MAX);
+ buffering = min_t(u8, buffering, EP_CFG_BUFFERING_MAX);
+ maxburst = min_t(u8, maxburst, EP_CFG_MAXBURST_MAX);
+
/* onchip buffer is only allocated before configuration */
if (!priv_dev->hw_configured_flag) {
ret = cdns3_ep_onchip_buffer_reserve(priv_dev, buffering + 1,
@@ -2970,6 +2974,40 @@ static int cdns3_gadget_udc_stop(struct usb_gadget *gadget)
return 0;
}
+/**
+ * cdns3_gadget_check_config - ensure cdns3 can support the USB configuration
+ * @gadget: pointer to the USB gadget
+ *
+ * Used to record the maximum number of endpoints being used in a USB composite
+ * device. (across all configurations) This is to be used in the calculation
+ * of the TXFIFO sizes when resizing internal memory for individual endpoints.
+ * It will help ensured that the resizing logic reserves enough space for at
+ * least one max packet.
+ */
+static int cdns3_gadget_check_config(struct usb_gadget *gadget)
+{
+ struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
+ struct usb_ep *ep;
+ int n_in = 0;
+ int total;
+
+ list_for_each_entry(ep, &gadget->ep_list, ep_list) {
+ if (ep->claimed && (ep->address & USB_DIR_IN))
+ n_in++;
+ }
+
+ /* 2KB are reserved for EP0, 1KB for out*/
+ total = 2 + n_in + 1;
+
+ if (total > priv_dev->onchip_buffers)
+ return -ENOMEM;
+
+ priv_dev->ep_buf_size = priv_dev->ep_iso_burst =
+ (priv_dev->onchip_buffers - 2) / (n_in + 1);
+
+ return 0;
+}
+
static const struct usb_gadget_ops cdns3_gadget_ops = {
.get_frame = cdns3_gadget_get_frame,
.wakeup = cdns3_gadget_wakeup,
@@ -2978,6 +3016,7 @@ static const struct usb_gadget_ops cdns3_gadget_ops = {
.udc_start = cdns3_gadget_udc_start,
.udc_stop = cdns3_gadget_udc_stop,
.match_ep = cdns3_gadget_match_ep,
+ .check_config = cdns3_gadget_check_config,
};
static void cdns3_free_all_eps(struct cdns3_device *priv_dev)
diff --git a/drivers/usb/cdns3/cdns3-gadget.h b/drivers/usb/cdns3/cdns3-gadget.h
index c5660f2c4293f..fbe4a8e3aa897 100644
--- a/drivers/usb/cdns3/cdns3-gadget.h
+++ b/drivers/usb/cdns3/cdns3-gadget.h
@@ -562,15 +562,18 @@ struct cdns3_usb_regs {
/* Max burst size (used only in SS mode). */
#define EP_CFG_MAXBURST_MASK GENMASK(11, 8)
#define EP_CFG_MAXBURST(p) (((p) << 8) & EP_CFG_MAXBURST_MASK)
+#define EP_CFG_MAXBURST_MAX 15
/* ISO max burst. */
#define EP_CFG_MULT_MASK GENMASK(15, 14)
#define EP_CFG_MULT(p) (((p) << 14) & EP_CFG_MULT_MASK)
+#define EP_CFG_MULT_MAX 2
/* ISO max burst. */
#define EP_CFG_MAXPKTSIZE_MASK GENMASK(26, 16)
#define EP_CFG_MAXPKTSIZE(p) (((p) << 16) & EP_CFG_MAXPKTSIZE_MASK)
/* Max number of buffered packets. */
#define EP_CFG_BUFFERING_MASK GENMASK(31, 27)
#define EP_CFG_BUFFERING(p) (((p) << 27) & EP_CFG_BUFFERING_MASK)
+#define EP_CFG_BUFFERING_MAX 15
/* EP_CMD - bitmasks */
/* Endpoint reset. */
@@ -1094,9 +1097,6 @@ struct cdns3_trb {
#define CDNS3_ENDPOINTS_MAX_COUNT 32
#define CDNS3_EP_ZLP_BUF_SIZE 1024
-#define CDNS3_EP_BUF_SIZE 4 /* KB */
-#define CDNS3_EP_ISO_HS_MULT 3
-#define CDNS3_EP_ISO_SS_BURST 3
#define CDNS3_MAX_NUM_DESCMISS_BUF 32
#define CDNS3_DESCMIS_BUF_SIZE 2048 /* Bytes */
#define CDNS3_WA2_NUM_BUFFERS 128
@@ -1333,6 +1333,9 @@ struct cdns3_device {
/*in KB */
u16 onchip_buffers;
u16 onchip_used_size;
+
+ u16 ep_buf_size;
+ u16 ep_iso_burst;
};
void cdns3_set_register_bit(void __iomem *ptr, u32 mask);
--
2.35.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v9 1/1] usb: cdns3: allocate TX FIFO size according to composite EP number
2022-05-09 16:40 [PATCH v9 1/1] usb: cdns3: allocate TX FIFO size according to composite EP number Frank Li
@ 2022-05-14 4:57 ` Peter Chen
0 siblings, 0 replies; 2+ messages in thread
From: Peter Chen @ 2022-05-14 4:57 UTC (permalink / raw)
To: Frank Li
Cc: pawell, rogerq, a-govindraju, linux-usb, jun.li, lznuaa, gregkh,
linux-kernel
On 22-05-09 11:40:55, Frank Li wrote:
> Some devices have USB compositions which may require multiple endpoints.
> To get better performance, need bigger CDNS3_EP_BUF_SIZE.
>
> But bigger CDNS3_EP_BUF_SIZE may exceed total hardware FIFO size when
> multiple endpoints.
>
> By introducing the check_config() callback, calculate CDNS3_EP_BUF_SIZE.
>
> Move CDNS3_EP_BUF_SIZE into cnds3_device: ep_buf_size
> Combine CDNS3_EP_ISO_SS_BURST and CDNS3_EP_ISO_HS_MULT into
> cnds3_device:ep_iso_burst
>
> Using a simple algorithm to calculate ep_buf_size.
> ep_buf_size = ep_iso_burst = (onchip_buffers - 2k) / (number of IN EP +
> 1).
>
> Test at 8qxp:
>
> Gadget ep_buf_size
>
> RNDIS: 5
> RNDIS+ACM: 3
> Mass Storage + NCM + ACM 2
>
> Previous CDNS3_EP_BUF_SIZE is 4, RNDIS + ACM will be failure because
> exceed FIFO memory.
>
> Signed-off-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Peter Chen <peter.chen@kernel.org>
Peter
> ---
> Change from v8 to v9
> fix typo in commit message
> move max value check before cdns3_ep_onchip_buffer_reserve()
> remove priv_dev->ep_buf_size = 1 and priv_dev->ep_iso_burst = 1;
>
> Change from v2 to v8:
> mistake pump version to v8
> Change from v1 to v2:
> Add safe check for mult, buffering and maxburst
>
> drivers/usb/cdns3/cdns3-gadget.c | 47 +++++++++++++++++++++++++++++---
> drivers/usb/cdns3/cdns3-gadget.h | 9 ++++--
> 2 files changed, 49 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
> index 1f3b4a1422126..3a3f323d9ce79 100644
> --- a/drivers/usb/cdns3/cdns3-gadget.c
> +++ b/drivers/usb/cdns3/cdns3-gadget.c
> @@ -2050,7 +2050,7 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
> u8 mult = 0;
> int ret;
>
> - buffering = CDNS3_EP_BUF_SIZE - 1;
> + buffering = priv_dev->ep_buf_size - 1;
>
> cdns3_configure_dmult(priv_dev, priv_ep);
>
> @@ -2069,7 +2069,7 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
> break;
> default:
> ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_ISOC);
> - mult = CDNS3_EP_ISO_HS_MULT - 1;
> + mult = priv_dev->ep_iso_burst - 1;
> buffering = mult + 1;
> }
>
> @@ -2085,14 +2085,14 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
> mult = 0;
> max_packet_size = 1024;
> if (priv_ep->type == USB_ENDPOINT_XFER_ISOC) {
> - maxburst = CDNS3_EP_ISO_SS_BURST - 1;
> + maxburst = priv_dev->ep_iso_burst - 1;
> buffering = (mult + 1) *
> (maxburst + 1);
>
> if (priv_ep->interval > 1)
> buffering++;
> } else {
> - maxburst = CDNS3_EP_BUF_SIZE - 1;
> + maxburst = priv_dev->ep_buf_size - 1;
> }
> break;
> default:
> @@ -2107,6 +2107,10 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
> else
> priv_ep->trb_burst_size = 16;
>
> + mult = min_t(u8, mult, EP_CFG_MULT_MAX);
> + buffering = min_t(u8, buffering, EP_CFG_BUFFERING_MAX);
> + maxburst = min_t(u8, maxburst, EP_CFG_MAXBURST_MAX);
> +
> /* onchip buffer is only allocated before configuration */
> if (!priv_dev->hw_configured_flag) {
> ret = cdns3_ep_onchip_buffer_reserve(priv_dev, buffering + 1,
> @@ -2970,6 +2974,40 @@ static int cdns3_gadget_udc_stop(struct usb_gadget *gadget)
> return 0;
> }
>
> +/**
> + * cdns3_gadget_check_config - ensure cdns3 can support the USB configuration
> + * @gadget: pointer to the USB gadget
> + *
> + * Used to record the maximum number of endpoints being used in a USB composite
> + * device. (across all configurations) This is to be used in the calculation
> + * of the TXFIFO sizes when resizing internal memory for individual endpoints.
> + * It will help ensured that the resizing logic reserves enough space for at
> + * least one max packet.
> + */
> +static int cdns3_gadget_check_config(struct usb_gadget *gadget)
> +{
> + struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
> + struct usb_ep *ep;
> + int n_in = 0;
> + int total;
> +
> + list_for_each_entry(ep, &gadget->ep_list, ep_list) {
> + if (ep->claimed && (ep->address & USB_DIR_IN))
> + n_in++;
> + }
> +
> + /* 2KB are reserved for EP0, 1KB for out*/
> + total = 2 + n_in + 1;
> +
> + if (total > priv_dev->onchip_buffers)
> + return -ENOMEM;
> +
> + priv_dev->ep_buf_size = priv_dev->ep_iso_burst =
> + (priv_dev->onchip_buffers - 2) / (n_in + 1);
> +
> + return 0;
> +}
> +
> static const struct usb_gadget_ops cdns3_gadget_ops = {
> .get_frame = cdns3_gadget_get_frame,
> .wakeup = cdns3_gadget_wakeup,
> @@ -2978,6 +3016,7 @@ static const struct usb_gadget_ops cdns3_gadget_ops = {
> .udc_start = cdns3_gadget_udc_start,
> .udc_stop = cdns3_gadget_udc_stop,
> .match_ep = cdns3_gadget_match_ep,
> + .check_config = cdns3_gadget_check_config,
> };
>
> static void cdns3_free_all_eps(struct cdns3_device *priv_dev)
> diff --git a/drivers/usb/cdns3/cdns3-gadget.h b/drivers/usb/cdns3/cdns3-gadget.h
> index c5660f2c4293f..fbe4a8e3aa897 100644
> --- a/drivers/usb/cdns3/cdns3-gadget.h
> +++ b/drivers/usb/cdns3/cdns3-gadget.h
> @@ -562,15 +562,18 @@ struct cdns3_usb_regs {
> /* Max burst size (used only in SS mode). */
> #define EP_CFG_MAXBURST_MASK GENMASK(11, 8)
> #define EP_CFG_MAXBURST(p) (((p) << 8) & EP_CFG_MAXBURST_MASK)
> +#define EP_CFG_MAXBURST_MAX 15
> /* ISO max burst. */
> #define EP_CFG_MULT_MASK GENMASK(15, 14)
> #define EP_CFG_MULT(p) (((p) << 14) & EP_CFG_MULT_MASK)
> +#define EP_CFG_MULT_MAX 2
> /* ISO max burst. */
> #define EP_CFG_MAXPKTSIZE_MASK GENMASK(26, 16)
> #define EP_CFG_MAXPKTSIZE(p) (((p) << 16) & EP_CFG_MAXPKTSIZE_MASK)
> /* Max number of buffered packets. */
> #define EP_CFG_BUFFERING_MASK GENMASK(31, 27)
> #define EP_CFG_BUFFERING(p) (((p) << 27) & EP_CFG_BUFFERING_MASK)
> +#define EP_CFG_BUFFERING_MAX 15
>
> /* EP_CMD - bitmasks */
> /* Endpoint reset. */
> @@ -1094,9 +1097,6 @@ struct cdns3_trb {
> #define CDNS3_ENDPOINTS_MAX_COUNT 32
> #define CDNS3_EP_ZLP_BUF_SIZE 1024
>
> -#define CDNS3_EP_BUF_SIZE 4 /* KB */
> -#define CDNS3_EP_ISO_HS_MULT 3
> -#define CDNS3_EP_ISO_SS_BURST 3
> #define CDNS3_MAX_NUM_DESCMISS_BUF 32
> #define CDNS3_DESCMIS_BUF_SIZE 2048 /* Bytes */
> #define CDNS3_WA2_NUM_BUFFERS 128
> @@ -1333,6 +1333,9 @@ struct cdns3_device {
> /*in KB */
> u16 onchip_buffers;
> u16 onchip_used_size;
> +
> + u16 ep_buf_size;
> + u16 ep_iso_burst;
> };
>
> void cdns3_set_register_bit(void __iomem *ptr, u32 mask);
> --
> 2.35.1
>
--
Thanks,
Peter Chen
^ permalink raw reply [flat|nested] 2+ messages in thread
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