On Mon, Nov 15, 2021 at 12:33 PM Sai Prakash Ranjan
<quic_saipraka@xxxxxxxxxxx> wrote:
> /*
> * Generic IO read/write. These perform native-endian accesses.
> */
> -#define __raw_writeb __raw_writeb
> -static inline void __raw_writeb(u8 val, volatile void __iomem *addr)
> +static inline void arch_raw_writeb(u8 val, volatile void __iomem *addr)
> {
> asm volatile("strb %w0, [%1]" : : "rZ" (val), "r" (addr));
> }
Woundn't removing the #define here will break the logic in
include/asm-generic/io.h,
making it fall back to the pointer-dereference version for the actual access?
> +#if IS_ENABLED(CONFIG_TRACE_MMIO_ACCESS) && !(defined(__DISABLE_TRACE_MMIO__))
> +DECLARE_TRACEPOINT(rwmmio_write);
> +DECLARE_TRACEPOINT(rwmmio_read);
> +
> +void log_write_mmio(const char *width, volatile void __iomem *addr);
> +void log_read_mmio(const char *width, const volatile void __iomem *addr);
> +
> +#define __raw_write(v, a, _l) ({ \
> + volatile void __iomem *_a = (a); \
> + if (tracepoint_enabled(rwmmio_write)) \
> + log_write_mmio(__stringify(write##_l), _a); \
> + arch_raw_write##_l((v), _a); \
> + })
This feels like it's getting too big to be inlined. Have you considered
integrating this with the lib/logic_iomem.c infrastructure instead?
That already provides a way to override MMIO areas, and it lets you do
the logging from a single place rather than having it duplicated in every
single caller. It also provides a way of filtering it based on the ioremap()
call.
Arnd
