From 61e258ee33328ea8dbd9208ad79d281693d5e0e4 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 2 Dec 2019 11:08:35 +0000 Subject: [PATCH] drm/i915/gt: Use soft-rc6 for w/a protection Now that we have soft-rc6 in place, we can use that instead of the forcewake to disable rc6 while active; preferred by a few microbenchmarks. Signed-off-by: Chris Wilson Acked-by: Andi Shyti Link: https://patchwork.freedesktop.org/patch/msgid/20191202110836.2342685-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/gt/intel_gt_pm.c | 8 -------- drivers/gpu/drm/i915/gt/intel_rc6.c | 19 +++++++++++++------ drivers/gpu/drm/i915/gt/intel_rc6.h | 1 - 3 files changed, 13 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_pm.c index 2000018b6464..ecde67a75e32 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c +++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c @@ -61,9 +61,6 @@ static int __gt_unpark(struct intel_wakeref *wf) gt->awake = intel_display_power_get(i915, POWER_DOMAIN_GT_IRQ); GEM_BUG_ON(!gt->awake); - if (NEEDS_RC6_CTX_CORRUPTION_WA(i915)) - intel_uncore_forcewake_get(gt->uncore, FORCEWAKE_ALL); - intel_rc6_unpark(>->rc6); intel_rps_unpark(>->rps); i915_pmu_gt_unparked(i915); @@ -91,11 +88,6 @@ static int __gt_park(struct intel_wakeref *wf) /* Everything switched off, flush any residual interrupt just in case */ intel_synchronize_irq(i915); - if (NEEDS_RC6_CTX_CORRUPTION_WA(i915)) { - intel_rc6_ctx_wa_check(>->rc6); - intel_uncore_forcewake_put(gt->uncore, FORCEWAKE_ALL); - } - GEM_BUG_ON(!wakeref); intel_display_power_put(i915, POWER_DOMAIN_GT_IRQ, wakeref); diff --git a/drivers/gpu/drm/i915/gt/intel_rc6.c b/drivers/gpu/drm/i915/gt/intel_rc6.c index c4379c49c20d..f58674f4aaec 100644 --- a/drivers/gpu/drm/i915/gt/intel_rc6.c +++ b/drivers/gpu/drm/i915/gt/intel_rc6.c @@ -527,26 +527,25 @@ void intel_rc6_ctx_wa_resume(struct intel_rc6 *rc6) * Check if an RC6 CTX corruption has happened since the last check and if so * disable RC6 and runtime power management. */ -void intel_rc6_ctx_wa_check(struct intel_rc6 *rc6) +static bool intel_rc6_ctx_wa_check(struct intel_rc6 *rc6) { struct drm_i915_private *i915 = rc6_to_i915(rc6); if (!NEEDS_RC6_CTX_CORRUPTION_WA(i915)) - return; + return false; if (rc6->ctx_corrupted) - return; + return false; if (!intel_rc6_ctx_corrupted(rc6)) - return; + return false; dev_notice(i915->drm.dev, "RC6 context corruption, disabling runtime power management\n"); - intel_rc6_disable(rc6); rc6->ctx_corrupted = true; - return; + return true; } static void __intel_rc6_disable(struct intel_rc6 *rc6) @@ -627,6 +626,9 @@ void intel_rc6_enable(struct intel_rc6 *rc6) else if (INTEL_GEN(i915) >= 6) gen6_rc6_enable(rc6); + if (NEEDS_RC6_CTX_CORRUPTION_WA(i915)) + rc6->ctl_enable = 0; + intel_uncore_forcewake_put(uncore, FORCEWAKE_ALL); /* rc6 is ready, runtime-pm is go! */ @@ -652,6 +654,11 @@ void intel_rc6_park(struct intel_rc6 *rc6) if (!rc6->enabled) return; + if (unlikely(intel_rc6_ctx_wa_check(rc6))) { + intel_rc6_disable(rc6); + return; + } + /* Turn off the HW timers and go directly to rc6 */ set(uncore, GEN6_RC_CONTROL, GEN6_RC_CTL_RC6_ENABLE); set(uncore, GEN6_RC_STATE, 0x4 << RC_SW_TARGET_STATE_SHIFT); diff --git a/drivers/gpu/drm/i915/gt/intel_rc6.h b/drivers/gpu/drm/i915/gt/intel_rc6.h index 20d740ff7e55..f2821576bfd3 100644 --- a/drivers/gpu/drm/i915/gt/intel_rc6.h +++ b/drivers/gpu/drm/i915/gt/intel_rc6.h @@ -25,7 +25,6 @@ void intel_rc6_disable(struct intel_rc6 *rc6); u64 intel_rc6_residency_ns(struct intel_rc6 *rc6, i915_reg_t reg); u64 intel_rc6_residency_us(struct intel_rc6 *rc6, i915_reg_t reg); -void intel_rc6_ctx_wa_check(struct intel_rc6 *rc6); void intel_rc6_ctx_wa_resume(struct intel_rc6 *rc6); #endif /* INTEL_RC6_H */