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Date: Tue, 11 Oct 2022 13:34:33 -0500
From: Dan Vacura <w36195@...orola.com>
To: linux-usb@...r.kernel.org
Cc: Daniel Scally <dan.scally@...asonboard.com>,
Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
Dan Vacura <w36195@...orola.com>, stable@...r.kernel.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jonathan Corbet <corbet@....net>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Felipe Balbi <balbi@...nel.org>,
Paul Elder <paul.elder@...asonboard.com>,
Michael Grzeschik <m.grzeschik@...gutronix.de>,
linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: [PATCH v2 1/3] usb: gadget: uvc: make interrupt skip logic configurable
Some UDC hw may not support skipping interrupts, but still support the
request. Allow the interrupt frequency to be configurable to the user.
Default to not skip interrupts, a value of 0. This fixes a smmu panic
that is occurring on dwc3 hw.
Fixes: fc78941d8169 ("usb: gadget: uvc: decrease the interrupt load to a quarter")
Cc: <stable@...r.kernel.org>
Signed-off-by: Dan Vacura <w36195@...orola.com>
---
V1 -> V2:
- no change, new patch in series
Documentation/ABI/testing/configfs-usb-gadget-uvc | 1 +
Documentation/usb/gadget-testing.rst | 2 ++
drivers/usb/gadget/function/f_uvc.c | 3 +++
drivers/usb/gadget/function/u_uvc.h | 1 +
drivers/usb/gadget/function/uvc.h | 1 +
drivers/usb/gadget/function/uvc_configfs.c | 2 ++
drivers/usb/gadget/function/uvc_queue.c | 6 ++++++
drivers/usb/gadget/function/uvc_video.c | 3 ++-
8 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/Documentation/ABI/testing/configfs-usb-gadget-uvc b/Documentation/ABI/testing/configfs-usb-gadget-uvc
index 611b23e6488d..5dfaa3f7f6a4 100644
--- a/Documentation/ABI/testing/configfs-usb-gadget-uvc
+++ b/Documentation/ABI/testing/configfs-usb-gadget-uvc
@@ -8,6 +8,7 @@ Description: UVC function directory
streaming_maxpacket 1..1023 (fs), 1..3072 (hs/ss)
streaming_interval 1..16
function_name string [32]
+ req_int_skip_div unsigned int
=================== =============================
What: /config/usb-gadget/gadget/functions/uvc.name/control
diff --git a/Documentation/usb/gadget-testing.rst b/Documentation/usb/gadget-testing.rst
index 2278c9ffb74a..f9b5a09be1f4 100644
--- a/Documentation/usb/gadget-testing.rst
+++ b/Documentation/usb/gadget-testing.rst
@@ -794,6 +794,8 @@ The uvc function provides these attributes in its function directory:
sending or receiving when this configuration is
selected
function_name name of the interface
+ req_int_skip_div divisor of total requests to aid in calculating
+ interrupt frequency, 0 indicates all interrupt
=================== ================================================
There are also "control" and "streaming" subdirectories, each of which contain
diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
index 6e196e06181e..75f524c83996 100644
--- a/drivers/usb/gadget/function/f_uvc.c
+++ b/drivers/usb/gadget/function/f_uvc.c
@@ -655,6 +655,8 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
cpu_to_le16(max_packet_size * max_packet_mult *
(opts->streaming_maxburst + 1));
+ uvc->video.req_int_skip_div = opts->req_int_skip_div;
+
/* Allocate endpoints. */
ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep);
if (!ep) {
@@ -872,6 +874,7 @@ static struct usb_function_instance *uvc_alloc_inst(void)
opts->streaming_interval = 1;
opts->streaming_maxpacket = 1024;
+ opts->req_int_skip_div = 0;
snprintf(opts->function_name, sizeof(opts->function_name), "UVC Camera");
ret = uvcg_attach_configfs(opts);
diff --git a/drivers/usb/gadget/function/u_uvc.h b/drivers/usb/gadget/function/u_uvc.h
index 24b8681b0d6f..6f73bd5638ed 100644
--- a/drivers/usb/gadget/function/u_uvc.h
+++ b/drivers/usb/gadget/function/u_uvc.h
@@ -24,6 +24,7 @@ struct f_uvc_opts {
unsigned int streaming_interval;
unsigned int streaming_maxpacket;
unsigned int streaming_maxburst;
+ unsigned int req_int_skip_div;
unsigned int control_interface;
unsigned int streaming_interface;
diff --git a/drivers/usb/gadget/function/uvc.h b/drivers/usb/gadget/function/uvc.h
index 40226b1f7e14..53175cd564e5 100644
--- a/drivers/usb/gadget/function/uvc.h
+++ b/drivers/usb/gadget/function/uvc.h
@@ -107,6 +107,7 @@ struct uvc_video {
spinlock_t req_lock;
unsigned int req_int_count;
+ unsigned int req_int_skip_div;
void (*encode) (struct usb_request *req, struct uvc_video *video,
struct uvc_buffer *buf);
diff --git a/drivers/usb/gadget/function/uvc_configfs.c b/drivers/usb/gadget/function/uvc_configfs.c
index 4303a3283ba0..419e926ab57e 100644
--- a/drivers/usb/gadget/function/uvc_configfs.c
+++ b/drivers/usb/gadget/function/uvc_configfs.c
@@ -2350,6 +2350,7 @@ UVC_ATTR(f_uvc_opts_, cname, cname)
UVCG_OPTS_ATTR(streaming_interval, streaming_interval, 16);
UVCG_OPTS_ATTR(streaming_maxpacket, streaming_maxpacket, 3072);
UVCG_OPTS_ATTR(streaming_maxburst, streaming_maxburst, 15);
+UVCG_OPTS_ATTR(req_int_skip_div, req_int_skip_div, UINT_MAX);
#undef UVCG_OPTS_ATTR
@@ -2399,6 +2400,7 @@ static struct configfs_attribute *uvc_attrs[] = {
&f_uvc_opts_attr_streaming_interval,
&f_uvc_opts_attr_streaming_maxpacket,
&f_uvc_opts_attr_streaming_maxburst,
+ &f_uvc_opts_attr_req_int_skip_div,
&f_uvc_opts_string_attr_function_name,
NULL,
};
diff --git a/drivers/usb/gadget/function/uvc_queue.c b/drivers/usb/gadget/function/uvc_queue.c
index ec500ee499ee..872d545838ee 100644
--- a/drivers/usb/gadget/function/uvc_queue.c
+++ b/drivers/usb/gadget/function/uvc_queue.c
@@ -63,6 +63,12 @@ static int uvc_queue_setup(struct vb2_queue *vq,
*/
nreq = DIV_ROUND_UP(DIV_ROUND_UP(sizes[0], 2), req_size);
nreq = clamp(nreq, 4U, 64U);
+ if (0 == video->req_int_skip_div) {
+ video->req_int_skip_div = nreq;
+ } else {
+ video->req_int_skip_div =
+ min_t(unsigned int, nreq, video->req_int_skip_div);
+ }
video->uvc_num_requests = nreq;
return 0;
diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c
index bb037fcc90e6..241df42ce0ae 100644
--- a/drivers/usb/gadget/function/uvc_video.c
+++ b/drivers/usb/gadget/function/uvc_video.c
@@ -413,7 +413,8 @@ static void uvcg_video_pump(struct work_struct *work)
if (list_empty(&video->req_free) ||
buf->state == UVC_BUF_STATE_DONE ||
!(video->req_int_count %
- DIV_ROUND_UP(video->uvc_num_requests, 4))) {
+ DIV_ROUND_UP(video->uvc_num_requests,
+ video->req_int_skip_div))) {
video->req_int_count = 0;
req->no_interrupt = 0;
} else {
--
2.34.1
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