usb: gadget: aspeed: improve vhub port irq handling
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Message ID 20200305023859.21057-1-rentao.bupt@gmail.com
State New
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Series
  • usb: gadget: aspeed: improve vhub port irq handling
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Commit Message

Tao Ren March 5, 2020, 2:38 a.m. UTC
From: Tao Ren <rentao.bupt@gmail.com>

This patch evaluates vhub ports' irq mask before going through per-port
irq handling one by one, which helps to speed up irq handling in case
there is no port interrupt.

Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
---
 drivers/usb/gadget/udc/aspeed-vhub/core.c | 11 ++++++-----
 drivers/usb/gadget/udc/aspeed-vhub/vhub.h |  8 ++++----
 2 files changed, 10 insertions(+), 9 deletions(-)

Comments

Benjamin Herrenschmidt March 5, 2020, 3:35 a.m. UTC | #1
On Wed, 2020-03-04 at 18:38 -0800, rentao.bupt@gmail.com wrote:
> From: Tao Ren <rentao.bupt@gmail.com>
> 
> This patch evaluates vhub ports' irq mask before going through per-
> port
> irq handling one by one, which helps to speed up irq handling in case
> there is no port interrupt.
> 
> Signed-off-by: Tao Ren <rentao.bupt@gmail.com>

Looks reasonable, but did you try a find_next_bit() loop and whether
that's faster ?

> ---
>  drivers/usb/gadget/udc/aspeed-vhub/core.c | 11 ++++++-----
>  drivers/usb/gadget/udc/aspeed-vhub/vhub.h |  8 ++++----
>  2 files changed, 10 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/core.c
> b/drivers/usb/gadget/udc/aspeed-vhub/core.c
> index f8d35dd60c34..a03e4e4ea401 100644
> --- a/drivers/usb/gadget/udc/aspeed-vhub/core.c
> +++ b/drivers/usb/gadget/udc/aspeed-vhub/core.c
> @@ -134,11 +134,11 @@ static irqreturn_t ast_vhub_irq(int irq, void
> *data)
>  	}
>  
>  	/* Handle device interrupts */
> -	for (i = 0; i < vhub->max_ports; i++) {
> -		u32 dev_mask = VHUB_IRQ_DEVICE1 << i;
> -
> -		if (istat & dev_mask)
> -			ast_vhub_dev_irq(&vhub->ports[i].dev);
> +	if (istat & vhub->port_irq_mask) {
> +		for (i = 0; i < vhub->max_ports; i++) {
> +			if (istat & VHUB_DEV_IRQ(i))
> +				ast_vhub_dev_irq(&vhub->ports[i].dev);
> +		}
>  	}
>  
>  	/* Handle top-level vHub EP0 interrupts */
> @@ -332,6 +332,7 @@ static int ast_vhub_probe(struct platform_device
> *pdev)
>  
>  	spin_lock_init(&vhub->lock);
>  	vhub->pdev = pdev;
> +	vhub->port_irq_mask = GENMASK(vhub->max_ports + 8, 9);
>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	vhub->regs = devm_ioremap_resource(&pdev->dev, res);
> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
> b/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
> index fac79ef6d669..e49924ec7e58 100644
> --- a/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
> +++ b/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
> @@ -54,10 +54,6 @@
>  #define VHUB_IRQ_USB_CMD_DEADLOCK		(1 << 18)
>  #define VHUB_IRQ_EP_POOL_NAK			(1 << 17)
>  #define VHUB_IRQ_EP_POOL_ACK_STALL		(1 << 16)
> -#define VHUB_IRQ_DEVICE5			(1 << 13)
> -#define VHUB_IRQ_DEVICE4			(1 << 12)
> -#define VHUB_IRQ_DEVICE3			(1 << 11)
> -#define VHUB_IRQ_DEVICE2			(1 << 10)
>  #define VHUB_IRQ_DEVICE1			(1 << 9)
>  #define VHUB_IRQ_BUS_RESUME			(1 << 8)
>  #define VHUB_IRQ_BUS_SUSPEND 			(1 << 7)
> @@ -70,6 +66,9 @@
>  #define VHUB_IRQ_HUB_EP0_SETUP			(1 << 0)
>  #define VHUB_IRQ_ACK_ALL			0x1ff
>  
> +/* Downstream device IRQ mask. */
> +#define VHUB_DEV_IRQ(n)				(VHUB_IRQ_DEVIC
> E1 << (n))
> +
>  /* SW reset reg */
>  #define VHUB_SW_RESET_EP_POOL			(1 << 9)
>  #define VHUB_SW_RESET_DMA_CONTROLLER		(1 << 8)
> @@ -402,6 +401,7 @@ struct ast_vhub {
>  	/* Per-port info */
>  	struct ast_vhub_port		*ports;
>  	u32				max_ports;
> +	u32				port_irq_mask;
>  
>  	/* Generic EP data structures */
>  	struct ast_vhub_ep		*epns;
Tao Ren March 5, 2020, 5:56 a.m. UTC | #2
On Thu, Mar 05, 2020 at 02:35:08PM +1100, Benjamin Herrenschmidt wrote:
> On Wed, 2020-03-04 at 18:38 -0800, rentao.bupt@gmail.com wrote:
> > From: Tao Ren <rentao.bupt@gmail.com>
> > 
> > This patch evaluates vhub ports' irq mask before going through per-
> > port
> > irq handling one by one, which helps to speed up irq handling in case
> > there is no port interrupt.
> > 
> > Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
> 
> Looks reasonable, but did you try a find_next_bit() loop and whether
> that's faster ?

Make sense. It should be more efficient especially when most ports are
idle (and I guess it's a common case). Will try and send out v2 soon.


Cheers,

Tao

Patch
diff mbox series

diff --git a/drivers/usb/gadget/udc/aspeed-vhub/core.c b/drivers/usb/gadget/udc/aspeed-vhub/core.c
index f8d35dd60c34..a03e4e4ea401 100644
--- a/drivers/usb/gadget/udc/aspeed-vhub/core.c
+++ b/drivers/usb/gadget/udc/aspeed-vhub/core.c
@@ -134,11 +134,11 @@  static irqreturn_t ast_vhub_irq(int irq, void *data)
 	}
 
 	/* Handle device interrupts */
-	for (i = 0; i < vhub->max_ports; i++) {
-		u32 dev_mask = VHUB_IRQ_DEVICE1 << i;
-
-		if (istat & dev_mask)
-			ast_vhub_dev_irq(&vhub->ports[i].dev);
+	if (istat & vhub->port_irq_mask) {
+		for (i = 0; i < vhub->max_ports; i++) {
+			if (istat & VHUB_DEV_IRQ(i))
+				ast_vhub_dev_irq(&vhub->ports[i].dev);
+		}
 	}
 
 	/* Handle top-level vHub EP0 interrupts */
@@ -332,6 +332,7 @@  static int ast_vhub_probe(struct platform_device *pdev)
 
 	spin_lock_init(&vhub->lock);
 	vhub->pdev = pdev;
+	vhub->port_irq_mask = GENMASK(vhub->max_ports + 8, 9);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	vhub->regs = devm_ioremap_resource(&pdev->dev, res);
diff --git a/drivers/usb/gadget/udc/aspeed-vhub/vhub.h b/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
index fac79ef6d669..e49924ec7e58 100644
--- a/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
+++ b/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
@@ -54,10 +54,6 @@ 
 #define VHUB_IRQ_USB_CMD_DEADLOCK		(1 << 18)
 #define VHUB_IRQ_EP_POOL_NAK			(1 << 17)
 #define VHUB_IRQ_EP_POOL_ACK_STALL		(1 << 16)
-#define VHUB_IRQ_DEVICE5			(1 << 13)
-#define VHUB_IRQ_DEVICE4			(1 << 12)
-#define VHUB_IRQ_DEVICE3			(1 << 11)
-#define VHUB_IRQ_DEVICE2			(1 << 10)
 #define VHUB_IRQ_DEVICE1			(1 << 9)
 #define VHUB_IRQ_BUS_RESUME			(1 << 8)
 #define VHUB_IRQ_BUS_SUSPEND 			(1 << 7)
@@ -70,6 +66,9 @@ 
 #define VHUB_IRQ_HUB_EP0_SETUP			(1 << 0)
 #define VHUB_IRQ_ACK_ALL			0x1ff
 
+/* Downstream device IRQ mask. */
+#define VHUB_DEV_IRQ(n)				(VHUB_IRQ_DEVICE1 << (n))
+
 /* SW reset reg */
 #define VHUB_SW_RESET_EP_POOL			(1 << 9)
 #define VHUB_SW_RESET_DMA_CONTROLLER		(1 << 8)
@@ -402,6 +401,7 @@  struct ast_vhub {
 	/* Per-port info */
 	struct ast_vhub_port		*ports;
 	u32				max_ports;
+	u32				port_irq_mask;
 
 	/* Generic EP data structures */
 	struct ast_vhub_ep		*epns;