diff options
Diffstat (limited to 'src/intel/common')
| -rw-r--r-- | src/intel/common/gen_device_info.c | 13 | ||||
| -rw-r--r-- | src/intel/common/gen_device_info.h | 24 |
2 files changed, 35 insertions, 2 deletions
diff --git a/src/intel/common/gen_device_info.c b/src/intel/common/gen_device_info.c index 9bf3cd5cc42..209b293e510 100644 --- a/src/intel/common/gen_device_info.c +++ b/src/intel/common/gen_device_info.c @@ -36,6 +36,7 @@ static const struct gen_device_info gen_device_info_i965 = { .urb = { .size = 256, }, + .timebase_scale = 80, }; static const struct gen_device_info gen_device_info_g4x = { @@ -51,6 +52,7 @@ static const struct gen_device_info gen_device_info_g4x = { .urb = { .size = 384, }, + .timebase_scale = 80, }; static const struct gen_device_info gen_device_info_ilk = { @@ -65,6 +67,7 @@ static const struct gen_device_info gen_device_info_ilk = { .urb = { .size = 1024, }, + .timebase_scale = 80, }; static const struct gen_device_info gen_device_info_snb_gt1 = { @@ -89,6 +92,7 @@ static const struct gen_device_info gen_device_info_snb_gt1 = { [MESA_SHADER_GEOMETRY] = 256, }, }, + .timebase_scale = 80, }; static const struct gen_device_info gen_device_info_snb_gt2 = { @@ -113,6 +117,7 @@ static const struct gen_device_info gen_device_info_snb_gt2 = { [MESA_SHADER_GEOMETRY] = 256, }, }, + .timebase_scale = 80, }; #define GEN7_FEATURES \ @@ -121,7 +126,8 @@ static const struct gen_device_info gen_device_info_snb_gt2 = { .must_use_separate_stencil = true, \ .has_llc = true, \ .has_pln = true, \ - .has_surface_tile_offset = true + .has_surface_tile_offset = true, \ + .timebase_scale = 80 static const struct gen_device_info gen_device_info_ivb_gt1 = { GEN7_FEATURES, .is_ivybridge = true, .gt = 1, @@ -287,7 +293,8 @@ static const struct gen_device_info gen_device_info_hsw_gt3 = { .max_tcs_threads = 504, \ .max_tes_threads = 504, \ .max_gs_threads = 504, \ - .max_wm_threads = 384 + .max_wm_threads = 384, \ + .timebase_scale = 80 static const struct gen_device_info gen_device_info_bdw_gt1 = { GEN8_FEATURES, .gt = 1, @@ -385,6 +392,7 @@ static const struct gen_device_info gen_device_info_chv = { .max_tcs_threads = 336, \ .max_tes_threads = 336, \ .max_cs_threads = 56, \ + .timebase_scale = 1000000000.0 / 12000000.0, \ .urb = { \ .size = 384, \ .min_entries = { \ @@ -410,6 +418,7 @@ static const struct gen_device_info gen_device_info_chv = { .max_tes_threads = 112, \ .max_gs_threads = 112, \ .max_cs_threads = 6 * 6, \ + .timebase_scale = 1000000000.0 / 19200123.0, \ .urb = { \ .size = 192, \ .min_entries = { \ diff --git a/src/intel/common/gen_device_info.h b/src/intel/common/gen_device_info.h index f0e8750d0ea..80676d0e003 100644 --- a/src/intel/common/gen_device_info.h +++ b/src/intel/common/gen_device_info.h @@ -147,6 +147,30 @@ struct gen_device_info */ unsigned max_entries[4]; } urb; + + /** + * For the longest time the timestamp frequency for Gen's timestamp counter + * could be assumed to be 12.5MHz, where the least significant bit neatly + * corresponded to 80 nanoseconds. + * + * Since Gen9 the numbers aren't so round, with a a frequency of 12MHz for + * SKL (or scale factor of 83.33333333) and a frequency of 19200123Hz for + * BXT. + * + * For simplicty to fit with the current code scaling by a single constant + * to map from raw timestamps to nanoseconds we now do the conversion in + * floating point instead of integer arithmetic. + * + * In general it's probably worth noting that the documented constants we + * have for the per-platform timestamp frequencies aren't perfect and + * shouldn't be trusted for scaling and comparing timestamps with a large + * delta. + * + * E.g. with crude testing on my system using the 'correct' scale factor I'm + * seeing a drift of ~2 milliseconds per second. + */ + double timebase_scale; + /** @} */ }; |