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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c1d5fb019f
There were reports that PWC-based webcams don't work at some embedded ARM platforms. [1] Isochronous transfer handler seems to work too long leading to the issues in MUSB USB host subsystem. Also note, that urb->giveback() handlers are still called with disabled interrupts. In order to be able to measure performance of PWC driver, traces are introduced in URB handler section. [1] https://www.spinics.net/lists/linux-usb/msg165735.html Signed-off-by: Matwey V. Kornilov <matwey@sai.msu.ru> Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#if !defined(_TRACE_PWC_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_PWC_H
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#include <linux/usb.h>
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#include <linux/tracepoint.h>
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM pwc
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TRACE_EVENT(pwc_handler_enter,
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TP_PROTO(struct urb *urb, struct pwc_device *pdev),
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TP_ARGS(urb, pdev),
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TP_STRUCT__entry(
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__field(struct urb*, urb)
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__field(struct pwc_frame_buf*, fbuf)
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__field(int, urb__status)
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__field(u32, urb__actual_length)
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__field(int, fbuf__filled)
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__string(name, pdev->v4l2_dev.name)
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),
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TP_fast_assign(
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__entry->urb = urb;
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__entry->fbuf = pdev->fill_buf;
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__entry->urb__status = urb->status;
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__entry->urb__actual_length = urb->actual_length;
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__entry->fbuf__filled = (pdev->fill_buf
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? pdev->fill_buf->filled : 0);
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__assign_str(name, pdev->v4l2_dev.name);
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),
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TP_printk("dev=%s (fbuf=%p filled=%d) urb=%p (status=%d actual_length=%u)",
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__get_str(name),
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__entry->fbuf,
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__entry->fbuf__filled,
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__entry->urb,
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__entry->urb__status,
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__entry->urb__actual_length)
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);
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TRACE_EVENT(pwc_handler_exit,
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TP_PROTO(struct urb *urb, struct pwc_device *pdev),
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TP_ARGS(urb, pdev),
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TP_STRUCT__entry(
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__field(struct urb*, urb)
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__field(struct pwc_frame_buf*, fbuf)
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__field(int, fbuf__filled)
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__string(name, pdev->v4l2_dev.name)
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),
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TP_fast_assign(
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__entry->urb = urb;
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__entry->fbuf = pdev->fill_buf;
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__entry->fbuf__filled = pdev->fill_buf->filled;
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__assign_str(name, pdev->v4l2_dev.name);
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),
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TP_printk(" dev=%s (fbuf=%p filled=%d) urb=%p",
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__get_str(name),
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__entry->fbuf,
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__entry->fbuf__filled,
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__entry->urb)
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);
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#endif /* _TRACE_PWC_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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