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drm/i915/perf: implement active wait for noa configurations

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NOA configuration take some amount of time to apply. That amount of
time depends on the size of the GT. There is no documented time for
this. For example, past experimentations with powergating
configuration changes seem to indicate a 60~70us delay. We go with
500us as default for now which should be over the required amount of
time (according to HW architects).

v2: Don't forget to save/restore registers used for the wait (Chris)

v3: Name used CS_GPR registers (Chris)
    Fix compile issue due to rebase (Lionel)

v4: Fix save/restore helpers (Umesh)

v5: Move noa_wait from drm_i915_private to i915_perf_stream (Lionel)

v6: Add missing struct declarations in i915_perf.h

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20191012072308.30312-2-chris@chris-wilson.co.uk
This commit is contained in:
Lionel Landwerlin
2019-10-12 08:23:07 +01:00
committed by Chris Wilson
parent 6a45008ab7
commit daed3e4439
8 changed files with 492 additions and 2 deletions
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32
drivers/gpu/drm/i915/i915_debugfs.c
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@@ -3590,6 +3590,37 @@ DEFINE_SIMPLE_ATTRIBUTE(i915_wedged_fops,
i915_wedged_get, i915_wedged_set,
"%llu\n");
static int
i915_perf_noa_delay_set(void *data, u64 val)
{
struct drm_i915_private *i915 = data;
const u32 clk = RUNTIME_INFO(i915)->cs_timestamp_frequency_khz;
/*
* This would lead to infinite waits as we're doing timestamp
* difference on the CS with only 32bits.
*/
if (val > mul_u32_u32(U32_MAX, clk))
return -EINVAL;
atomic64_set(&i915->perf.noa_programming_delay, val);
return 0;
}
static int
i915_perf_noa_delay_get(void *data, u64 *val)
{
struct drm_i915_private *i915 = data;
*val = atomic64_read(&i915->perf.noa_programming_delay);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(i915_perf_noa_delay_fops,
i915_perf_noa_delay_get,
i915_perf_noa_delay_set,
"%llu\n");
#define DROP_UNBOUND BIT(0)
#define DROP_BOUND BIT(1)
#define DROP_RETIRE BIT(2)
@@ -4345,6 +4376,7 @@ static const struct i915_debugfs_files {
const char *name;
const struct file_operations *fops;
} i915_debugfs_files[] = {
{"i915_perf_noa_delay", &i915_perf_noa_delay_fops},
{"i915_wedged", &i915_wedged_fops},
{"i915_cache_sharing", &i915_cache_sharing_fops},
{"i915_gem_drop_caches", &i915_drop_caches_fops},