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344d1a4015
Prior to Skylake the Gen HW timestamps were driven by a 12.5MHz clock with the convenient property of being able to scale by an integer (80) to nanosecond units. For Skylake the frequency is 12MHz or a scale factor of 83.333333 This updates gen_device_info to track a floating point timebase_scale factor and makes corresponding _queryobj.c changes to no longer assume a scale factor of 80 works across all gens. Although the gen6_ code could have been been left alone, the changes keep the code more comparable, and it now shares a few utility functions for scaling raw timestamps and calculating deltas. The utility for calculating deltas takes into account 32 or 36bit overflow depending on the current kernel version. Note: this leaves the timestamp handling of ARB_query_buffer_object untouched, which continues to use an incorrect scale of 80 on Skylake for now. This is more awkward to solve since the scaling is currently done using a very limited uint64 ALU available to the command parser that doesn't support multiply or divide where it's already taking a large number of instructions just to effectively multiple by 80. This fixes piglit arb_timer_query-timestamp-get on Skylake v2: (Ken) Update timebase_scale for platforms past Skylake/Broxton too. Signed-off-by: Robert Bragg <robert@sixbynine.org> Reviewed-by: Matt Turner <mattst88@gmail.com> Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> |
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| .. | ||
| gen_debug.c | ||
| gen_debug.h | ||
| gen_device_info.c | ||
| gen_device_info.h | ||
| gen_l3_config.c | ||
| gen_l3_config.h | ||
| gen_sample_positions.h | ||
| gen_urb_config.c | ||