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usb: musb: add tracepoints for register access
This adds tracepoints to musb register read/write wrappers to get trace log for register access. The default tacepoint log prefix here would be musb_readX/writeX(), which is not much helpful. So this patch let the tracepoints use __buildin_return_address(0) to print the caller funciton name to provide more context of the register access. Signed-off-by: Bin Liu <b-liu@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
086b288282
commit
c74173fdd4
2 changed files with 103 additions and 3 deletions
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@ -102,6 +102,7 @@
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#include <linux/usb.h>
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#include "musb_core.h"
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#include "musb_trace.h"
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#define TA_WAIT_BCON(m) max_t(int, (m)->a_wait_bcon, OTG_TIME_A_WAIT_BCON)
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@ -258,31 +259,43 @@ static u32 musb_default_busctl_offset(u8 epnum, u16 offset)
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static u8 musb_default_readb(const void __iomem *addr, unsigned offset)
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{
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return __raw_readb(addr + offset);
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u8 data = __raw_readb(addr + offset);
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trace_musb_readb(__builtin_return_address(0), addr, offset, data);
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return data;
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}
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static void musb_default_writeb(void __iomem *addr, unsigned offset, u8 data)
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{
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trace_musb_writeb(__builtin_return_address(0), addr, offset, data);
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__raw_writeb(data, addr + offset);
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}
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static u16 musb_default_readw(const void __iomem *addr, unsigned offset)
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{
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return __raw_readw(addr + offset);
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u16 data = __raw_readw(addr + offset);
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trace_musb_readw(__builtin_return_address(0), addr, offset, data);
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return data;
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}
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static void musb_default_writew(void __iomem *addr, unsigned offset, u16 data)
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{
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trace_musb_writew(__builtin_return_address(0), addr, offset, data);
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__raw_writew(data, addr + offset);
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}
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static u32 musb_default_readl(const void __iomem *addr, unsigned offset)
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{
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return __raw_readl(addr + offset);
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u32 data = __raw_readl(addr + offset);
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trace_musb_readl(__builtin_return_address(0), addr, offset, data);
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return data;
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}
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static void musb_default_writel(void __iomem *addr, unsigned offset, u32 data)
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{
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trace_musb_writel(__builtin_return_address(0), addr, offset, data);
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__raw_writel(data, addr + offset);
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}
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@ -41,6 +41,93 @@ TRACE_EVENT(musb_log,
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TP_printk("%s: %s", __get_str(name), __get_str(msg))
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);
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DECLARE_EVENT_CLASS(musb_regb,
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TP_PROTO(void *caller, const void *addr, unsigned int offset, u8 data),
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TP_ARGS(caller, addr, offset, data),
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TP_STRUCT__entry(
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__field(void *, caller)
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__field(const void *, addr)
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__field(unsigned int, offset)
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__field(u8, data)
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),
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TP_fast_assign(
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__entry->caller = caller;
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__entry->addr = addr;
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__entry->offset = offset;
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__entry->data = data;
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),
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TP_printk("%pS: %p + %04x: %02x",
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__entry->caller, __entry->addr, __entry->offset, __entry->data)
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);
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DEFINE_EVENT(musb_regb, musb_readb,
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TP_PROTO(void *caller, const void *addr, unsigned int offset, u8 data),
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TP_ARGS(caller, addr, offset, data)
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);
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DEFINE_EVENT(musb_regb, musb_writeb,
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TP_PROTO(void *caller, const void *addr, unsigned int offset, u8 data),
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TP_ARGS(caller, addr, offset, data)
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);
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DECLARE_EVENT_CLASS(musb_regw,
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TP_PROTO(void *caller, const void *addr, unsigned int offset, u16 data),
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TP_ARGS(caller, addr, offset, data),
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TP_STRUCT__entry(
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__field(void *, caller)
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__field(const void *, addr)
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__field(unsigned int, offset)
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__field(u16, data)
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),
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TP_fast_assign(
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__entry->caller = caller;
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__entry->addr = addr;
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__entry->offset = offset;
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__entry->data = data;
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),
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TP_printk("%pS: %p + %04x: %04x",
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__entry->caller, __entry->addr, __entry->offset, __entry->data)
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);
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DEFINE_EVENT(musb_regw, musb_readw,
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TP_PROTO(void *caller, const void *addr, unsigned int offset, u16 data),
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TP_ARGS(caller, addr, offset, data)
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);
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DEFINE_EVENT(musb_regw, musb_writew,
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TP_PROTO(void *caller, const void *addr, unsigned int offset, u16 data),
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TP_ARGS(caller, addr, offset, data)
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);
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DECLARE_EVENT_CLASS(musb_regl,
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TP_PROTO(void *caller, const void *addr, unsigned int offset, u32 data),
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TP_ARGS(caller, addr, offset, data),
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TP_STRUCT__entry(
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__field(void *, caller)
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__field(const void *, addr)
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__field(unsigned int, offset)
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__field(u32, data)
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),
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TP_fast_assign(
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__entry->caller = caller;
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__entry->addr = addr;
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__entry->offset = offset;
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__entry->data = data;
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),
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TP_printk("%pS: %p + %04x: %08x",
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__entry->caller, __entry->addr, __entry->offset, __entry->data)
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);
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DEFINE_EVENT(musb_regl, musb_readl,
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TP_PROTO(void *caller, const void *addr, unsigned int offset, u32 data),
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TP_ARGS(caller, addr, offset, data)
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);
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DEFINE_EVENT(musb_regl, musb_writel,
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TP_PROTO(void *caller, const void *addr, unsigned int offset, u32 data),
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TP_ARGS(caller, addr, offset, data)
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);
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#endif /* __MUSB_TRACE_H */
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/* this part has to be here */
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