795 lines
22 KiB
C
795 lines
22 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright © 2019 Intel Corporation
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*/
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#include <linux/pm_runtime.h>
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#include "i915_drv.h"
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#include "i915_vgpu.h"
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#include "intel_gt.h"
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#include "intel_gt_pm.h"
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#include "intel_rc6.h"
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#include "intel_sideband.h"
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/**
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* DOC: RC6
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*
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* RC6 is a special power stage which allows the GPU to enter an very
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* low-voltage mode when idle, using down to 0V while at this stage. This
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* stage is entered automatically when the GPU is idle when RC6 support is
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* enabled, and as soon as new workload arises GPU wakes up automatically as
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* well.
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*
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* There are different RC6 modes available in Intel GPU, which differentiate
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* among each other with the latency required to enter and leave RC6 and
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* voltage consumed by the GPU in different states.
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*
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* The combination of the following flags define which states GPU is allowed
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* to enter, while RC6 is the normal RC6 state, RC6p is the deep RC6, and
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* RC6pp is deepest RC6. Their support by hardware varies according to the
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* GPU, BIOS, chipset and platform. RC6 is usually the safest one and the one
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* which brings the most power savings; deeper states save more power, but
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* require higher latency to switch to and wake up.
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*/
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static struct intel_gt *rc6_to_gt(struct intel_rc6 *rc6)
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{
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return container_of(rc6, struct intel_gt, rc6);
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}
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static struct intel_uncore *rc6_to_uncore(struct intel_rc6 *rc)
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{
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return rc6_to_gt(rc)->uncore;
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}
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static struct drm_i915_private *rc6_to_i915(struct intel_rc6 *rc)
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{
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return rc6_to_gt(rc)->i915;
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}
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static void set(struct intel_uncore *uncore, i915_reg_t reg, u32 val)
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{
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intel_uncore_write_fw(uncore, reg, val);
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}
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static void gen11_rc6_enable(struct intel_rc6 *rc6)
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{
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struct intel_gt *gt = rc6_to_gt(rc6);
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struct intel_uncore *uncore = gt->uncore;
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struct intel_engine_cs *engine;
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enum intel_engine_id id;
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u32 pg_enable;
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int i;
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/* 2b: Program RC6 thresholds.*/
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set(uncore, GEN6_RC6_WAKE_RATE_LIMIT, 54 << 16 | 85);
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set(uncore, GEN10_MEDIA_WAKE_RATE_LIMIT, 150);
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set(uncore, GEN6_RC_EVALUATION_INTERVAL, 125000); /* 12500 * 1280ns */
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set(uncore, GEN6_RC_IDLE_HYSTERSIS, 25); /* 25 * 1280ns */
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for_each_engine(engine, rc6_to_gt(rc6), id)
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set(uncore, RING_MAX_IDLE(engine->mmio_base), 10);
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set(uncore, GUC_MAX_IDLE_COUNT, 0xA);
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set(uncore, GEN6_RC_SLEEP, 0);
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set(uncore, GEN6_RC6_THRESHOLD, 50000); /* 50/125ms per EI */
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/*
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* 2c: Program Coarse Power Gating Policies.
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*
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* Bspec's guidance is to use 25us (really 25 * 1280ns) here. What we
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* use instead is a more conservative estimate for the maximum time
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* it takes us to service a CS interrupt and submit a new ELSP - that
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* is the time which the GPU is idle waiting for the CPU to select the
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* next request to execute. If the idle hysteresis is less than that
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* interrupt service latency, the hardware will automatically gate
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* the power well and we will then incur the wake up cost on top of
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* the service latency. A similar guide from plane_state is that we
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* do not want the enable hysteresis to less than the wakeup latency.
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*
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* igt/gem_exec_nop/sequential provides a rough estimate for the
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* service latency, and puts it under 10us for Icelake, similar to
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* Broadwell+, To be conservative, we want to factor in a context
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* switch on top (due to ksoftirqd).
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*/
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set(uncore, GEN9_MEDIA_PG_IDLE_HYSTERESIS, 60);
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set(uncore, GEN9_RENDER_PG_IDLE_HYSTERESIS, 60);
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/* 3a: Enable RC6 */
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rc6->ctl_enable =
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GEN6_RC_CTL_HW_ENABLE |
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GEN6_RC_CTL_RC6_ENABLE |
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GEN6_RC_CTL_EI_MODE(1);
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pg_enable =
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GEN9_RENDER_PG_ENABLE |
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GEN9_MEDIA_PG_ENABLE |
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GEN11_MEDIA_SAMPLER_PG_ENABLE;
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if (INTEL_GEN(gt->i915) >= 12) {
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for (i = 0; i < I915_MAX_VCS; i++)
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if (HAS_ENGINE(gt, _VCS(i)))
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pg_enable |= (VDN_HCP_POWERGATE_ENABLE(i) |
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VDN_MFX_POWERGATE_ENABLE(i));
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}
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set(uncore, GEN9_PG_ENABLE, pg_enable);
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}
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static void gen9_rc6_enable(struct intel_rc6 *rc6)
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{
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struct intel_uncore *uncore = rc6_to_uncore(rc6);
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struct intel_engine_cs *engine;
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enum intel_engine_id id;
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/* 2b: Program RC6 thresholds.*/
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if (INTEL_GEN(rc6_to_i915(rc6)) >= 10) {
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set(uncore, GEN6_RC6_WAKE_RATE_LIMIT, 54 << 16 | 85);
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set(uncore, GEN10_MEDIA_WAKE_RATE_LIMIT, 150);
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} else if (IS_SKYLAKE(rc6_to_i915(rc6))) {
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/*
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* WaRsDoubleRc6WrlWithCoarsePowerGating:skl Doubling WRL only
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* when CPG is enabled
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*/
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set(uncore, GEN6_RC6_WAKE_RATE_LIMIT, 108 << 16);
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} else {
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set(uncore, GEN6_RC6_WAKE_RATE_LIMIT, 54 << 16);
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}
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set(uncore, GEN6_RC_EVALUATION_INTERVAL, 125000); /* 12500 * 1280ns */
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set(uncore, GEN6_RC_IDLE_HYSTERSIS, 25); /* 25 * 1280ns */
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for_each_engine(engine, rc6_to_gt(rc6), id)
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set(uncore, RING_MAX_IDLE(engine->mmio_base), 10);
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set(uncore, GUC_MAX_IDLE_COUNT, 0xA);
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set(uncore, GEN6_RC_SLEEP, 0);
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/*
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* 2c: Program Coarse Power Gating Policies.
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*
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* Bspec's guidance is to use 25us (really 25 * 1280ns) here. What we
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* use instead is a more conservative estimate for the maximum time
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* it takes us to service a CS interrupt and submit a new ELSP - that
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* is the time which the GPU is idle waiting for the CPU to select the
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* next request to execute. If the idle hysteresis is less than that
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* interrupt service latency, the hardware will automatically gate
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* the power well and we will then incur the wake up cost on top of
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* the service latency. A similar guide from plane_state is that we
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* do not want the enable hysteresis to less than the wakeup latency.
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*
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* igt/gem_exec_nop/sequential provides a rough estimate for the
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* service latency, and puts it around 10us for Broadwell (and other
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* big core) and around 40us for Broxton (and other low power cores).
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* [Note that for legacy ringbuffer submission, this is less than 1us!]
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* However, the wakeup latency on Broxton is closer to 100us. To be
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* conservative, we have to factor in a context switch on top (due
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* to ksoftirqd).
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*/
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set(uncore, GEN9_MEDIA_PG_IDLE_HYSTERESIS, 250);
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set(uncore, GEN9_RENDER_PG_IDLE_HYSTERESIS, 250);
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/* 3a: Enable RC6 */
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set(uncore, GEN6_RC6_THRESHOLD, 37500); /* 37.5/125ms per EI */
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rc6->ctl_enable =
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GEN6_RC_CTL_HW_ENABLE |
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GEN6_RC_CTL_RC6_ENABLE |
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GEN6_RC_CTL_EI_MODE(1);
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/*
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* WaRsDisableCoarsePowerGating:skl,cnl
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* - Render/Media PG need to be disabled with RC6.
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*/
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if (!NEEDS_WaRsDisableCoarsePowerGating(rc6_to_i915(rc6)))
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set(uncore, GEN9_PG_ENABLE,
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GEN9_RENDER_PG_ENABLE | GEN9_MEDIA_PG_ENABLE);
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}
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static void gen8_rc6_enable(struct intel_rc6 *rc6)
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{
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struct intel_uncore *uncore = rc6_to_uncore(rc6);
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struct intel_engine_cs *engine;
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enum intel_engine_id id;
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/* 2b: Program RC6 thresholds.*/
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set(uncore, GEN6_RC6_WAKE_RATE_LIMIT, 40 << 16);
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set(uncore, GEN6_RC_EVALUATION_INTERVAL, 125000); /* 12500 * 1280ns */
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set(uncore, GEN6_RC_IDLE_HYSTERSIS, 25); /* 25 * 1280ns */
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for_each_engine(engine, rc6_to_gt(rc6), id)
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set(uncore, RING_MAX_IDLE(engine->mmio_base), 10);
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set(uncore, GEN6_RC_SLEEP, 0);
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set(uncore, GEN6_RC6_THRESHOLD, 625); /* 800us/1.28 for TO */
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/* 3: Enable RC6 */
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rc6->ctl_enable =
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GEN6_RC_CTL_HW_ENABLE |
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GEN7_RC_CTL_TO_MODE |
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GEN6_RC_CTL_RC6_ENABLE;
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}
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static void gen6_rc6_enable(struct intel_rc6 *rc6)
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{
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struct intel_uncore *uncore = rc6_to_uncore(rc6);
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struct drm_i915_private *i915 = rc6_to_i915(rc6);
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struct intel_engine_cs *engine;
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enum intel_engine_id id;
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u32 rc6vids, rc6_mask;
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int ret;
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set(uncore, GEN6_RC1_WAKE_RATE_LIMIT, 1000 << 16);
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set(uncore, GEN6_RC6_WAKE_RATE_LIMIT, 40 << 16 | 30);
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set(uncore, GEN6_RC6pp_WAKE_RATE_LIMIT, 30);
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set(uncore, GEN6_RC_EVALUATION_INTERVAL, 125000);
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set(uncore, GEN6_RC_IDLE_HYSTERSIS, 25);
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for_each_engine(engine, rc6_to_gt(rc6), id)
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set(uncore, RING_MAX_IDLE(engine->mmio_base), 10);
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set(uncore, GEN6_RC_SLEEP, 0);
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set(uncore, GEN6_RC1e_THRESHOLD, 1000);
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set(uncore, GEN6_RC6_THRESHOLD, 50000);
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set(uncore, GEN6_RC6p_THRESHOLD, 150000);
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set(uncore, GEN6_RC6pp_THRESHOLD, 64000); /* unused */
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/* We don't use those on Haswell */
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rc6_mask = GEN6_RC_CTL_RC6_ENABLE;
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if (HAS_RC6p(i915))
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rc6_mask |= GEN6_RC_CTL_RC6p_ENABLE;
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if (HAS_RC6pp(i915))
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rc6_mask |= GEN6_RC_CTL_RC6pp_ENABLE;
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rc6->ctl_enable =
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rc6_mask |
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GEN6_RC_CTL_EI_MODE(1) |
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GEN6_RC_CTL_HW_ENABLE;
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rc6vids = 0;
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ret = sandybridge_pcode_read(i915, GEN6_PCODE_READ_RC6VIDS,
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&rc6vids, NULL);
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if (IS_GEN(i915, 6) && ret) {
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drm_dbg(&i915->drm, "Couldn't check for BIOS workaround\n");
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} else if (IS_GEN(i915, 6) &&
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(GEN6_DECODE_RC6_VID(rc6vids & 0xff) < 450)) {
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drm_dbg(&i915->drm,
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"You should update your BIOS. Correcting minimum rc6 voltage (%dmV->%dmV)\n",
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GEN6_DECODE_RC6_VID(rc6vids & 0xff), 450);
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rc6vids &= 0xffff00;
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rc6vids |= GEN6_ENCODE_RC6_VID(450);
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ret = sandybridge_pcode_write(i915, GEN6_PCODE_WRITE_RC6VIDS, rc6vids);
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if (ret)
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drm_err(&i915->drm,
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"Couldn't fix incorrect rc6 voltage\n");
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}
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}
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/* Check that the pcbr address is not empty. */
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static int chv_rc6_init(struct intel_rc6 *rc6)
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{
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struct intel_uncore *uncore = rc6_to_uncore(rc6);
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struct drm_i915_private *i915 = rc6_to_i915(rc6);
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resource_size_t pctx_paddr, paddr;
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resource_size_t pctx_size = 32 * SZ_1K;
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u32 pcbr;
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pcbr = intel_uncore_read(uncore, VLV_PCBR);
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if ((pcbr >> VLV_PCBR_ADDR_SHIFT) == 0) {
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drm_dbg(&i915->drm, "BIOS didn't set up PCBR, fixing up\n");
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paddr = i915->dsm.end + 1 - pctx_size;
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GEM_BUG_ON(paddr > U32_MAX);
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pctx_paddr = (paddr & ~4095);
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intel_uncore_write(uncore, VLV_PCBR, pctx_paddr);
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}
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return 0;
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}
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static int vlv_rc6_init(struct intel_rc6 *rc6)
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{
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struct drm_i915_private *i915 = rc6_to_i915(rc6);
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struct intel_uncore *uncore = rc6_to_uncore(rc6);
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struct drm_i915_gem_object *pctx;
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resource_size_t pctx_paddr;
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resource_size_t pctx_size = 24 * SZ_1K;
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u32 pcbr;
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pcbr = intel_uncore_read(uncore, VLV_PCBR);
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if (pcbr) {
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/* BIOS set it up already, grab the pre-alloc'd space */
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resource_size_t pcbr_offset;
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pcbr_offset = (pcbr & ~4095) - i915->dsm.start;
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pctx = i915_gem_object_create_stolen_for_preallocated(i915,
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pcbr_offset,
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pctx_size);
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if (IS_ERR(pctx))
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return PTR_ERR(pctx);
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goto out;
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}
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drm_dbg(&i915->drm, "BIOS didn't set up PCBR, fixing up\n");
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/*
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* From the Gunit register HAS:
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* The Gfx driver is expected to program this register and ensure
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* proper allocation within Gfx stolen memory. For example, this
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* register should be programmed such than the PCBR range does not
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* overlap with other ranges, such as the frame buffer, protected
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* memory, or any other relevant ranges.
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*/
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pctx = i915_gem_object_create_stolen(i915, pctx_size);
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if (IS_ERR(pctx)) {
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drm_dbg(&i915->drm,
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"not enough stolen space for PCTX, disabling\n");
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return PTR_ERR(pctx);
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}
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GEM_BUG_ON(range_overflows_end_t(u64,
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i915->dsm.start,
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pctx->stolen->start,
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U32_MAX));
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pctx_paddr = i915->dsm.start + pctx->stolen->start;
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intel_uncore_write(uncore, VLV_PCBR, pctx_paddr);
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out:
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rc6->pctx = pctx;
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return 0;
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}
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static void chv_rc6_enable(struct intel_rc6 *rc6)
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{
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struct intel_uncore *uncore = rc6_to_uncore(rc6);
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struct intel_engine_cs *engine;
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enum intel_engine_id id;
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/* 2a: Program RC6 thresholds.*/
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set(uncore, GEN6_RC6_WAKE_RATE_LIMIT, 40 << 16);
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set(uncore, GEN6_RC_EVALUATION_INTERVAL, 125000); /* 12500 * 1280ns */
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set(uncore, GEN6_RC_IDLE_HYSTERSIS, 25); /* 25 * 1280ns */
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for_each_engine(engine, rc6_to_gt(rc6), id)
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set(uncore, RING_MAX_IDLE(engine->mmio_base), 10);
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set(uncore, GEN6_RC_SLEEP, 0);
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/* TO threshold set to 500 us (0x186 * 1.28 us) */
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set(uncore, GEN6_RC6_THRESHOLD, 0x186);
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/* Allows RC6 residency counter to work */
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set(uncore, VLV_COUNTER_CONTROL,
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_MASKED_BIT_ENABLE(VLV_COUNT_RANGE_HIGH |
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VLV_MEDIA_RC6_COUNT_EN |
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VLV_RENDER_RC6_COUNT_EN));
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/* 3: Enable RC6 */
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rc6->ctl_enable = GEN7_RC_CTL_TO_MODE;
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}
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static void vlv_rc6_enable(struct intel_rc6 *rc6)
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{
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struct intel_uncore *uncore = rc6_to_uncore(rc6);
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struct intel_engine_cs *engine;
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enum intel_engine_id id;
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set(uncore, GEN6_RC6_WAKE_RATE_LIMIT, 0x00280000);
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set(uncore, GEN6_RC_EVALUATION_INTERVAL, 125000);
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set(uncore, GEN6_RC_IDLE_HYSTERSIS, 25);
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for_each_engine(engine, rc6_to_gt(rc6), id)
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set(uncore, RING_MAX_IDLE(engine->mmio_base), 10);
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set(uncore, GEN6_RC6_THRESHOLD, 0x557);
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/* Allows RC6 residency counter to work */
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set(uncore, VLV_COUNTER_CONTROL,
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_MASKED_BIT_ENABLE(VLV_COUNT_RANGE_HIGH |
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VLV_MEDIA_RC0_COUNT_EN |
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VLV_RENDER_RC0_COUNT_EN |
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VLV_MEDIA_RC6_COUNT_EN |
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VLV_RENDER_RC6_COUNT_EN));
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rc6->ctl_enable =
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GEN7_RC_CTL_TO_MODE | VLV_RC_CTL_CTX_RST_PARALLEL;
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}
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static bool bxt_check_bios_rc6_setup(struct intel_rc6 *rc6)
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{
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struct intel_uncore *uncore = rc6_to_uncore(rc6);
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struct drm_i915_private *i915 = rc6_to_i915(rc6);
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u32 rc6_ctx_base, rc_ctl, rc_sw_target;
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bool enable_rc6 = true;
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rc_ctl = intel_uncore_read(uncore, GEN6_RC_CONTROL);
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rc_sw_target = intel_uncore_read(uncore, GEN6_RC_STATE);
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rc_sw_target &= RC_SW_TARGET_STATE_MASK;
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rc_sw_target >>= RC_SW_TARGET_STATE_SHIFT;
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drm_dbg(&i915->drm, "BIOS enabled RC states: "
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"HW_CTRL %s HW_RC6 %s SW_TARGET_STATE %x\n",
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onoff(rc_ctl & GEN6_RC_CTL_HW_ENABLE),
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onoff(rc_ctl & GEN6_RC_CTL_RC6_ENABLE),
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rc_sw_target);
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if (!(intel_uncore_read(uncore, RC6_LOCATION) & RC6_CTX_IN_DRAM)) {
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drm_dbg(&i915->drm, "RC6 Base location not set properly.\n");
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enable_rc6 = false;
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}
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/*
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* The exact context size is not known for BXT, so assume a page size
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* for this check.
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*/
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rc6_ctx_base =
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intel_uncore_read(uncore, RC6_CTX_BASE) & RC6_CTX_BASE_MASK;
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|
if (!(rc6_ctx_base >= i915->dsm_reserved.start &&
|
|
rc6_ctx_base + PAGE_SIZE < i915->dsm_reserved.end)) {
|
|
drm_dbg(&i915->drm, "RC6 Base address not as expected.\n");
|
|
enable_rc6 = false;
|
|
}
|
|
|
|
if (!((intel_uncore_read(uncore, PWRCTX_MAXCNT_RCSUNIT) & IDLE_TIME_MASK) > 1 &&
|
|
(intel_uncore_read(uncore, PWRCTX_MAXCNT_VCSUNIT0) & IDLE_TIME_MASK) > 1 &&
|
|
(intel_uncore_read(uncore, PWRCTX_MAXCNT_BCSUNIT) & IDLE_TIME_MASK) > 1 &&
|
|
(intel_uncore_read(uncore, PWRCTX_MAXCNT_VECSUNIT) & IDLE_TIME_MASK) > 1)) {
|
|
drm_dbg(&i915->drm,
|
|
"Engine Idle wait time not set properly.\n");
|
|
enable_rc6 = false;
|
|
}
|
|
|
|
if (!intel_uncore_read(uncore, GEN8_PUSHBUS_CONTROL) ||
|
|
!intel_uncore_read(uncore, GEN8_PUSHBUS_ENABLE) ||
|
|
!intel_uncore_read(uncore, GEN8_PUSHBUS_SHIFT)) {
|
|
drm_dbg(&i915->drm, "Pushbus not setup properly.\n");
|
|
enable_rc6 = false;
|
|
}
|
|
|
|
if (!intel_uncore_read(uncore, GEN6_GFXPAUSE)) {
|
|
drm_dbg(&i915->drm, "GFX pause not setup properly.\n");
|
|
enable_rc6 = false;
|
|
}
|
|
|
|
if (!intel_uncore_read(uncore, GEN8_MISC_CTRL0)) {
|
|
drm_dbg(&i915->drm, "GPM control not setup properly.\n");
|
|
enable_rc6 = false;
|
|
}
|
|
|
|
return enable_rc6;
|
|
}
|
|
|
|
static bool rc6_supported(struct intel_rc6 *rc6)
|
|
{
|
|
struct drm_i915_private *i915 = rc6_to_i915(rc6);
|
|
|
|
if (!HAS_RC6(i915))
|
|
return false;
|
|
|
|
if (intel_vgpu_active(i915))
|
|
return false;
|
|
|
|
if (is_mock_gt(rc6_to_gt(rc6)))
|
|
return false;
|
|
|
|
if (IS_GEN9_LP(i915) && !bxt_check_bios_rc6_setup(rc6)) {
|
|
drm_notice(&i915->drm,
|
|
"RC6 and powersaving disabled by BIOS\n");
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static void rpm_get(struct intel_rc6 *rc6)
|
|
{
|
|
GEM_BUG_ON(rc6->wakeref);
|
|
pm_runtime_get_sync(rc6_to_i915(rc6)->drm.dev);
|
|
rc6->wakeref = true;
|
|
}
|
|
|
|
static void rpm_put(struct intel_rc6 *rc6)
|
|
{
|
|
GEM_BUG_ON(!rc6->wakeref);
|
|
pm_runtime_put(rc6_to_i915(rc6)->drm.dev);
|
|
rc6->wakeref = false;
|
|
}
|
|
|
|
static bool pctx_corrupted(struct intel_rc6 *rc6)
|
|
{
|
|
struct drm_i915_private *i915 = rc6_to_i915(rc6);
|
|
|
|
if (!NEEDS_RC6_CTX_CORRUPTION_WA(i915))
|
|
return false;
|
|
|
|
if (intel_uncore_read(rc6_to_uncore(rc6), GEN8_RC6_CTX_INFO))
|
|
return false;
|
|
|
|
drm_notice(&i915->drm,
|
|
"RC6 context corruption, disabling runtime power management\n");
|
|
return true;
|
|
}
|
|
|
|
static void __intel_rc6_disable(struct intel_rc6 *rc6)
|
|
{
|
|
struct drm_i915_private *i915 = rc6_to_i915(rc6);
|
|
struct intel_uncore *uncore = rc6_to_uncore(rc6);
|
|
|
|
intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL);
|
|
if (INTEL_GEN(i915) >= 9)
|
|
set(uncore, GEN9_PG_ENABLE, 0);
|
|
set(uncore, GEN6_RC_CONTROL, 0);
|
|
set(uncore, GEN6_RC_STATE, 0);
|
|
intel_uncore_forcewake_put(uncore, FORCEWAKE_ALL);
|
|
}
|
|
|
|
void intel_rc6_init(struct intel_rc6 *rc6)
|
|
{
|
|
struct drm_i915_private *i915 = rc6_to_i915(rc6);
|
|
int err;
|
|
|
|
/* Disable runtime-pm until we can save the GPU state with rc6 pctx */
|
|
rpm_get(rc6);
|
|
|
|
if (!rc6_supported(rc6))
|
|
return;
|
|
|
|
if (IS_CHERRYVIEW(i915))
|
|
err = chv_rc6_init(rc6);
|
|
else if (IS_VALLEYVIEW(i915))
|
|
err = vlv_rc6_init(rc6);
|
|
else
|
|
err = 0;
|
|
|
|
/* Sanitize rc6, ensure it is disabled before we are ready. */
|
|
__intel_rc6_disable(rc6);
|
|
|
|
rc6->supported = err == 0;
|
|
}
|
|
|
|
void intel_rc6_sanitize(struct intel_rc6 *rc6)
|
|
{
|
|
memset(rc6->prev_hw_residency, 0, sizeof(rc6->prev_hw_residency));
|
|
|
|
if (rc6->enabled) { /* unbalanced suspend/resume */
|
|
rpm_get(rc6);
|
|
rc6->enabled = false;
|
|
}
|
|
|
|
if (rc6->supported)
|
|
__intel_rc6_disable(rc6);
|
|
}
|
|
|
|
void intel_rc6_enable(struct intel_rc6 *rc6)
|
|
{
|
|
struct drm_i915_private *i915 = rc6_to_i915(rc6);
|
|
struct intel_uncore *uncore = rc6_to_uncore(rc6);
|
|
|
|
if (!rc6->supported)
|
|
return;
|
|
|
|
GEM_BUG_ON(rc6->enabled);
|
|
|
|
intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL);
|
|
|
|
if (IS_CHERRYVIEW(i915))
|
|
chv_rc6_enable(rc6);
|
|
else if (IS_VALLEYVIEW(i915))
|
|
vlv_rc6_enable(rc6);
|
|
else if (INTEL_GEN(i915) >= 11)
|
|
gen11_rc6_enable(rc6);
|
|
else if (INTEL_GEN(i915) >= 9)
|
|
gen9_rc6_enable(rc6);
|
|
else if (IS_BROADWELL(i915))
|
|
gen8_rc6_enable(rc6);
|
|
else if (INTEL_GEN(i915) >= 6)
|
|
gen6_rc6_enable(rc6);
|
|
|
|
rc6->manual = rc6->ctl_enable & GEN6_RC_CTL_RC6_ENABLE;
|
|
if (NEEDS_RC6_CTX_CORRUPTION_WA(i915))
|
|
rc6->ctl_enable = 0;
|
|
|
|
intel_uncore_forcewake_put(uncore, FORCEWAKE_ALL);
|
|
|
|
if (unlikely(pctx_corrupted(rc6)))
|
|
return;
|
|
|
|
/* rc6 is ready, runtime-pm is go! */
|
|
rpm_put(rc6);
|
|
rc6->enabled = true;
|
|
}
|
|
|
|
void intel_rc6_unpark(struct intel_rc6 *rc6)
|
|
{
|
|
struct intel_uncore *uncore = rc6_to_uncore(rc6);
|
|
|
|
if (!rc6->enabled)
|
|
return;
|
|
|
|
/* Restore HW timers for automatic RC6 entry while busy */
|
|
set(uncore, GEN6_RC_CONTROL, rc6->ctl_enable);
|
|
}
|
|
|
|
void intel_rc6_park(struct intel_rc6 *rc6)
|
|
{
|
|
struct intel_uncore *uncore = rc6_to_uncore(rc6);
|
|
unsigned int target;
|
|
|
|
if (!rc6->enabled)
|
|
return;
|
|
|
|
if (unlikely(pctx_corrupted(rc6))) {
|
|
intel_rc6_disable(rc6);
|
|
return;
|
|
}
|
|
|
|
if (!rc6->manual)
|
|
return;
|
|
|
|
/* Turn off the HW timers and go directly to rc6 */
|
|
set(uncore, GEN6_RC_CONTROL, GEN6_RC_CTL_RC6_ENABLE);
|
|
|
|
if (HAS_RC6pp(rc6_to_i915(rc6)))
|
|
target = 0x6; /* deepest rc6 */
|
|
else if (HAS_RC6p(rc6_to_i915(rc6)))
|
|
target = 0x5; /* deep rc6 */
|
|
else
|
|
target = 0x4; /* normal rc6 */
|
|
set(uncore, GEN6_RC_STATE, target << RC_SW_TARGET_STATE_SHIFT);
|
|
}
|
|
|
|
void intel_rc6_disable(struct intel_rc6 *rc6)
|
|
{
|
|
if (!rc6->enabled)
|
|
return;
|
|
|
|
rpm_get(rc6);
|
|
rc6->enabled = false;
|
|
|
|
__intel_rc6_disable(rc6);
|
|
}
|
|
|
|
void intel_rc6_fini(struct intel_rc6 *rc6)
|
|
{
|
|
struct drm_i915_gem_object *pctx;
|
|
|
|
intel_rc6_disable(rc6);
|
|
|
|
pctx = fetch_and_zero(&rc6->pctx);
|
|
if (pctx)
|
|
i915_gem_object_put(pctx);
|
|
|
|
if (rc6->wakeref)
|
|
rpm_put(rc6);
|
|
}
|
|
|
|
static u64 vlv_residency_raw(struct intel_uncore *uncore, const i915_reg_t reg)
|
|
{
|
|
u32 lower, upper, tmp;
|
|
int loop = 2;
|
|
|
|
/*
|
|
* The register accessed do not need forcewake. We borrow
|
|
* uncore lock to prevent concurrent access to range reg.
|
|
*/
|
|
lockdep_assert_held(&uncore->lock);
|
|
|
|
/*
|
|
* vlv and chv residency counters are 40 bits in width.
|
|
* With a control bit, we can choose between upper or lower
|
|
* 32bit window into this counter.
|
|
*
|
|
* Although we always use the counter in high-range mode elsewhere,
|
|
* userspace may attempt to read the value before rc6 is initialised,
|
|
* before we have set the default VLV_COUNTER_CONTROL value. So always
|
|
* set the high bit to be safe.
|
|
*/
|
|
set(uncore, VLV_COUNTER_CONTROL,
|
|
_MASKED_BIT_ENABLE(VLV_COUNT_RANGE_HIGH));
|
|
upper = intel_uncore_read_fw(uncore, reg);
|
|
do {
|
|
tmp = upper;
|
|
|
|
set(uncore, VLV_COUNTER_CONTROL,
|
|
_MASKED_BIT_DISABLE(VLV_COUNT_RANGE_HIGH));
|
|
lower = intel_uncore_read_fw(uncore, reg);
|
|
|
|
set(uncore, VLV_COUNTER_CONTROL,
|
|
_MASKED_BIT_ENABLE(VLV_COUNT_RANGE_HIGH));
|
|
upper = intel_uncore_read_fw(uncore, reg);
|
|
} while (upper != tmp && --loop);
|
|
|
|
/*
|
|
* Everywhere else we always use VLV_COUNTER_CONTROL with the
|
|
* VLV_COUNT_RANGE_HIGH bit set - so it is safe to leave it set
|
|
* now.
|
|
*/
|
|
|
|
return lower | (u64)upper << 8;
|
|
}
|
|
|
|
u64 intel_rc6_residency_ns(struct intel_rc6 *rc6, const i915_reg_t reg)
|
|
{
|
|
struct drm_i915_private *i915 = rc6_to_i915(rc6);
|
|
struct intel_uncore *uncore = rc6_to_uncore(rc6);
|
|
u64 time_hw, prev_hw, overflow_hw;
|
|
unsigned int fw_domains;
|
|
unsigned long flags;
|
|
unsigned int i;
|
|
u32 mul, div;
|
|
|
|
if (!rc6->supported)
|
|
return 0;
|
|
|
|
/*
|
|
* Store previous hw counter values for counter wrap-around handling.
|
|
*
|
|
* There are only four interesting registers and they live next to each
|
|
* other so we can use the relative address, compared to the smallest
|
|
* one as the index into driver storage.
|
|
*/
|
|
i = (i915_mmio_reg_offset(reg) -
|
|
i915_mmio_reg_offset(GEN6_GT_GFX_RC6_LOCKED)) / sizeof(u32);
|
|
if (drm_WARN_ON_ONCE(&i915->drm, i >= ARRAY_SIZE(rc6->cur_residency)))
|
|
return 0;
|
|
|
|
fw_domains = intel_uncore_forcewake_for_reg(uncore, reg, FW_REG_READ);
|
|
|
|
spin_lock_irqsave(&uncore->lock, flags);
|
|
intel_uncore_forcewake_get__locked(uncore, fw_domains);
|
|
|
|
/* On VLV and CHV, residency time is in CZ units rather than 1.28us */
|
|
if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
|
|
mul = 1000000;
|
|
div = i915->czclk_freq;
|
|
overflow_hw = BIT_ULL(40);
|
|
time_hw = vlv_residency_raw(uncore, reg);
|
|
} else {
|
|
/* 833.33ns units on Gen9LP, 1.28us elsewhere. */
|
|
if (IS_GEN9_LP(i915)) {
|
|
mul = 10000;
|
|
div = 12;
|
|
} else {
|
|
mul = 1280;
|
|
div = 1;
|
|
}
|
|
|
|
overflow_hw = BIT_ULL(32);
|
|
time_hw = intel_uncore_read_fw(uncore, reg);
|
|
}
|
|
|
|
/*
|
|
* Counter wrap handling.
|
|
*
|
|
* But relying on a sufficient frequency of queries otherwise counters
|
|
* can still wrap.
|
|
*/
|
|
prev_hw = rc6->prev_hw_residency[i];
|
|
rc6->prev_hw_residency[i] = time_hw;
|
|
|
|
/* RC6 delta from last sample. */
|
|
if (time_hw >= prev_hw)
|
|
time_hw -= prev_hw;
|
|
else
|
|
time_hw += overflow_hw - prev_hw;
|
|
|
|
/* Add delta to RC6 extended raw driver copy. */
|
|
time_hw += rc6->cur_residency[i];
|
|
rc6->cur_residency[i] = time_hw;
|
|
|
|
intel_uncore_forcewake_put__locked(uncore, fw_domains);
|
|
spin_unlock_irqrestore(&uncore->lock, flags);
|
|
|
|
return mul_u64_u32_div(time_hw, mul, div);
|
|
}
|
|
|
|
u64 intel_rc6_residency_us(struct intel_rc6 *rc6, i915_reg_t reg)
|
|
{
|
|
return DIV_ROUND_UP_ULL(intel_rc6_residency_ns(rc6, reg), 1000);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
|
|
#include "selftest_rc6.c"
|
|
#endif
|