On Fri, 31 Aug 2012, Damien Lespiau <damien.lespiau at gmail.com> wrote:
> From: Damien Lespiau <damien.lespiau at 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.
>
> Example usage:
>
> $ ./tools/intel_reg_dumper PCH_PP_CONTROL 0xabcd0002
> PCH_PP_CONTROL: 0xabcd0002 (blacklight disabled, power...
>
> v2: friendlier invocation (Chris Wilson)
>
> Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
> ---
> tools/intel_reg_dumper.c | 99 +++++++++++++++++++++++++++++++++++++++++-------
> 1 file changed, 86 insertions(+), 13 deletions(-)
>
> diff --git a/tools/intel_reg_dumper.c b/tools/intel_reg_dumper.c
> index b49d967..098affa 100644
> --- a/tools/intel_reg_dumper.c
> +++ b/tools/intel_reg_dumper.c
> @@ -1911,26 +1911,33 @@ 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,
> + (unsigned int)val, debug);
Is the cast really required? val is already unsigned. Ditto below in a
few places.
> + } else {
> + printf("%30.30s: 0x%08x\n", reg->name,
> + (unsigned int)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(®s[i], val);
> }
> }
>
> @@ -1964,6 +1971,54 @@ 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 (strcmp(name, regs[i].name) == 0)
> + return ®s[i];
strcasecmp for ease of use?
BR,
Jani.
> +
> + 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 +2227,7 @@ 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 +2237,9 @@ 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 +2254,24 @@ 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);
> --
> 1.7.11.4
>
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