Re: [PATCHv5 3/4] tracing: Add register read/write tracing support
From: Arnd Bergmann <arnd@arndb.de>
Date: 2021-12-06 08:59:45
Also in:
linux-arm-msm, lkml
On Mon, Dec 6, 2021 at 9:28 AM Sai Prakash Ranjan [off-list ref] wrote:
quoted hunk ↗ jump to hunk
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index 420ff4bc67fd..9f55bcc51de1 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig@@ -95,6 +95,13 @@ config RING_BUFFER_ALLOW_SWAP Allow the use of ring_buffer_swap_cpu. Adds a very slight overhead to tracing when enabled. +config TRACE_MMIO_ACCESS + bool "Register read/write tracing" + depends on TRACING + help + Create tracepoints for MMIO read/write operations. These trace events + can be used for logging all MMIO read/write operations.
I think this needs a 'depends on ARCH_HAVE_TRACE_MMIO_ACCESS' or similar.
quoted hunk ↗ jump to hunk
+void log_read_mmio(u8 width, const volatile void __iomem *addr) +{ + trace_rwmmio_read(CALLER_ADDR0, CALLER_ADDR1, width, addr); +}
Here, it may be better to pass the caller address as an argument, I think
CALLER_ADDR1 is not always reliable, though it's possible that it is
in the configurations when this file gets enabled.
Arnd
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