Re: [PATCH 1/4] intel_reg_dumper: Add a single register decode mode

[Jani Nikula <jani.nikula@linux.intel.com>]

On Mon, 03 Sep 2012, Damien Lespiau <damien.lespiau@gmail.com> wrote:
> From: Damien Lespiau <damien.lespiau@intel.com>
>
> From time to time, one would like to decode a register value that have
> been captured at a certain point in time (and say printed out with a
> printk). intel_reg_dumper has all the knowledge to do that and this
> patch adds a way to ask it to decode a value.

Without further bikeshedding: the series reviewed, briefly tested, and
liked by me.

Jani.


>
> Example usage:
>
> $ ./tools/intel_reg_dumper PCH_PP_CONTROL 0xabcd0002
>        PCH_PP_CONTROL: 0xabcd0002 (blacklight disabled, power...
>
> v2: friendlier invocation (Chris Wilson)
> v3: remove unecessary casts and use strcasecmp (Jani Nikula)
>
> Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
> ---
>  tools/intel_reg_dumper.c |   97 +++++++++++++++++++++++++++++++++++++++------
>  1 files changed, 84 insertions(+), 13 deletions(-)
>
> diff --git a/tools/intel_reg_dumper.c b/tools/intel_reg_dumper.c
> index 7564cae..cc68985 100644
> --- a/tools/intel_reg_dumper.c
> +++ b/tools/intel_reg_dumper.c
> @@ -1911,26 +1911,31 @@ static struct reg_debug i945gm_mi_regs[] = {
>  	DEFINEREG(ECOSKPD),
>  };
>  
> +static void
> +_intel_dump_reg(struct reg_debug *reg, uint32_t val)
> +{
> +	char debug[1024];
> +
> +	if (reg->debug_output != NULL) {
> +		reg->debug_output(debug, sizeof(debug), reg->reg, val);
> +		printf("%30.30s: 0x%08x (%s)\n",
> +		       reg->name, val, debug);
> +	} else {
> +		printf("%30.30s: 0x%08x\n", reg->name, val);
> +	}
> +}
> +
>  #define intel_dump_regs(regs) _intel_dump_regs(regs, ARRAY_SIZE(regs))
>  
>  static void
>  _intel_dump_regs(struct reg_debug *regs, int count)
>  {
> -	char debug[1024];
>  	int i;
>  
>  	for (i = 0; i < count; i++) {
>  		uint32_t val = INREG(regs[i].reg);
>  
> -		if (regs[i].debug_output != NULL) {
> -			regs[i].debug_output(debug, sizeof(debug), regs[i].reg, val);
> -			printf("%30.30s: 0x%08x (%s)\n",
> -			       regs[i].name,
> -			       (unsigned int)val, debug);
> -		} else {
> -			printf("%30.30s: 0x%08x\n", regs[i].name,
> -			       (unsigned int)val);
> -		}
> +		_intel_dump_reg(&regs[i], val);
>  	}
>  }
>  
> @@ -1964,6 +1969,54 @@ static struct reg_debug gen6_rp_debug_regs[] = {
>  	DEFINEREG(GEN6_PMINTRMSK),
>  };
>  
> +#define DECLARE_REGS(r)	{ .regs = r, .count = ARRAY_SIZE(r) }
> +static struct {
> +	struct reg_debug *regs;
> +	int count;
> +} known_registers[] = {
> +	DECLARE_REGS(ironlake_debug_regs),
> +	DECLARE_REGS(i945gm_mi_regs),
> +	DECLARE_REGS(intel_debug_regs),
> +	DECLARE_REGS(gen6_rp_debug_regs),
> +	DECLARE_REGS(haswell_debug_regs)
> +};
> +#undef DECLARE_REGS
> +
> +static struct reg_debug *
> +find_register_by_name(struct reg_debug *regs, int count,
> +		      const char *name)
> +{
> +	int i;
> +
> +	for (i = 0; i < count; i++)
> +		if (strcasecmp(name, regs[i].name) == 0)
> +			return &regs[i];
> +
> +	return NULL;
> +}
> +
> +static void
> +decode_register(const char *name, uint32_t val)
> +{
> +	int i;
> +	struct reg_debug *reg = NULL;
> +
> +	for (i = 0; i < ARRAY_SIZE(known_registers); i++) {
> +		reg = find_register_by_name(known_registers[i].regs,
> +					    known_registers[i].count,
> +					    name);
> +		if (reg)
> +			break;
> +	}
> +
> +	if (!reg) {
> +		fprintf(stderr, "Unknown register: %s\n", name);
> +		return;
> +	}
> +
> +	_intel_dump_reg(reg, val);
> +}
> +
>  static void
>  intel_dump_other_regs(void)
>  {
> @@ -2172,6 +2225,7 @@ intel_dump_other_regs(void)
>  static void print_usage(void)
>  {
>  	printf("Usage: intel_reg_dumper [options] [file]\n"
> +	       "       intel_reg_dumper [options] register value\n"
>  	       "Options:\n"
>  	       "  -d id   when a dump file is used, use 'id' as device id (in "
>  	       "hex)\n"
> @@ -2181,8 +2235,9 @@ static void print_usage(void)
>  int main(int argc, char** argv)
>  {
>  	struct pci_device *pci_dev;
> -	int opt;
> -	char *file = NULL;
> +	int opt, n_args;
> +	char *file = NULL, *reg_name = NULL;
> +	uint32_t reg_val;
>  
>  	while ((opt = getopt(argc, argv, "d:h")) != -1) {
>  		switch (opt) {
> @@ -2197,8 +2252,24 @@ int main(int argc, char** argv)
>  			return 1;
>  		}
>  	}
> -	if (optind < argc)
> +
> +	n_args = argc - optind;
> +	if (n_args == 1) {
>  		file = argv[optind];
> +	} else if (n_args == 2) {
> +		reg_name = argv[optind];
> +		reg_val = strtoul(argv[optind + 1], NULL, 0);
> +	} else if (n_args) {
> +		print_usage();
> +		return 1;
> +	}
> +
> +	/* the tool operates in "single" mode, decode a single register given
> +	 * on the command line: intel_reg_dumper PCH_PP_CONTROL 0xabcd0002 */
> +	if (reg_name) {
> +		decode_register(reg_name, reg_val);
> +		return 0;
> +	}
>  
>  	if (file) {
>  		intel_map_file(file);
> -- 
> 1.7.7.5
>
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