2 * SPDX-License-Identifier: MIT
4 * Copyright © 2019 Intel Corporation
7 #include <linux/pm_runtime.h>
10 #include "i915_vgpu.h"
12 #include "intel_gt_pm.h"
13 #include "intel_rc6.h"
14 #include "intel_sideband.h"
19 * RC6 is a special power stage which allows the GPU to enter an very
20 * low-voltage mode when idle, using down to 0V while at this stage. This
21 * stage is entered automatically when the GPU is idle when RC6 support is
22 * enabled, and as soon as new workload arises GPU wakes up automatically as
25 * There are different RC6 modes available in Intel GPU, which differentiate
26 * among each other with the latency required to enter and leave RC6 and
27 * voltage consumed by the GPU in different states.
29 * The combination of the following flags define which states GPU is allowed
30 * to enter, while RC6 is the normal RC6 state, RC6p is the deep RC6, and
31 * RC6pp is deepest RC6. Their support by hardware varies according to the
32 * GPU, BIOS, chipset and platform. RC6 is usually the safest one and the one
33 * which brings the most power savings; deeper states save more power, but
34 * require higher latency to switch to and wake up.
37 static struct intel_gt *rc6_to_gt(struct intel_rc6 *rc6)
39 return container_of(rc6, struct intel_gt, rc6);
42 static struct intel_uncore *rc6_to_uncore(struct intel_rc6 *rc)
44 return rc6_to_gt(rc)->uncore;
47 static struct drm_i915_private *rc6_to_i915(struct intel_rc6 *rc)
49 return rc6_to_gt(rc)->i915;
52 static inline void set(struct intel_uncore *uncore, i915_reg_t reg, u32 val)
54 intel_uncore_write_fw(uncore, reg, val);
57 static void gen11_rc6_enable(struct intel_rc6 *rc6)
59 struct intel_gt *gt = rc6_to_gt(rc6);
60 struct intel_uncore *uncore = gt->uncore;
61 struct intel_engine_cs *engine;
62 enum intel_engine_id id;
66 /* 2b: Program RC6 thresholds.*/
67 set(uncore, GEN6_RC6_WAKE_RATE_LIMIT, 54 << 16 | 85);
68 set(uncore, GEN10_MEDIA_WAKE_RATE_LIMIT, 150);
70 set(uncore, GEN6_RC_EVALUATION_INTERVAL, 125000); /* 12500 * 1280ns */
71 set(uncore, GEN6_RC_IDLE_HYSTERSIS, 25); /* 25 * 1280ns */
72 for_each_engine(engine, rc6_to_gt(rc6), id)
73 set(uncore, RING_MAX_IDLE(engine->mmio_base), 10);
75 set(uncore, GUC_MAX_IDLE_COUNT, 0xA);
77 set(uncore, GEN6_RC_SLEEP, 0);
79 set(uncore, GEN6_RC6_THRESHOLD, 50000); /* 50/125ms per EI */
82 * 2c: Program Coarse Power Gating Policies.
84 * Bspec's guidance is to use 25us (really 25 * 1280ns) here. What we
85 * use instead is a more conservative estimate for the maximum time
86 * it takes us to service a CS interrupt and submit a new ELSP - that
87 * is the time which the GPU is idle waiting for the CPU to select the
88 * next request to execute. If the idle hysteresis is less than that
89 * interrupt service latency, the hardware will automatically gate
90 * the power well and we will then incur the wake up cost on top of
91 * the service latency. A similar guide from plane_state is that we
92 * do not want the enable hysteresis to less than the wakeup latency.
94 * igt/gem_exec_nop/sequential provides a rough estimate for the
95 * service latency, and puts it under 10us for Icelake, similar to
96 * Broadwell+, To be conservative, we want to factor in a context
97 * switch on top (due to ksoftirqd).
99 set(uncore, GEN9_MEDIA_PG_IDLE_HYSTERESIS, 60);
100 set(uncore, GEN9_RENDER_PG_IDLE_HYSTERESIS, 60);
104 GEN6_RC_CTL_HW_ENABLE |
105 GEN6_RC_CTL_RC6_ENABLE |
106 GEN6_RC_CTL_EI_MODE(1);
109 GEN9_RENDER_PG_ENABLE |
110 GEN9_MEDIA_PG_ENABLE |
111 GEN11_MEDIA_SAMPLER_PG_ENABLE;
113 if (INTEL_GEN(gt->i915) >= 12) {
114 for (i = 0; i < I915_MAX_VCS; i++)
115 if (HAS_ENGINE(gt, _VCS(i)))
116 pg_enable |= (VDN_HCP_POWERGATE_ENABLE(i) |
117 VDN_MFX_POWERGATE_ENABLE(i));
120 set(uncore, GEN9_PG_ENABLE, pg_enable);
123 static void gen9_rc6_enable(struct intel_rc6 *rc6)
125 struct intel_uncore *uncore = rc6_to_uncore(rc6);
126 struct intel_engine_cs *engine;
127 enum intel_engine_id id;
129 /* 2b: Program RC6 thresholds.*/
130 if (INTEL_GEN(rc6_to_i915(rc6)) >= 10) {
131 set(uncore, GEN6_RC6_WAKE_RATE_LIMIT, 54 << 16 | 85);
132 set(uncore, GEN10_MEDIA_WAKE_RATE_LIMIT, 150);
133 } else if (IS_SKYLAKE(rc6_to_i915(rc6))) {
135 * WaRsDoubleRc6WrlWithCoarsePowerGating:skl Doubling WRL only
136 * when CPG is enabled
138 set(uncore, GEN6_RC6_WAKE_RATE_LIMIT, 108 << 16);
140 set(uncore, GEN6_RC6_WAKE_RATE_LIMIT, 54 << 16);
143 set(uncore, GEN6_RC_EVALUATION_INTERVAL, 125000); /* 12500 * 1280ns */
144 set(uncore, GEN6_RC_IDLE_HYSTERSIS, 25); /* 25 * 1280ns */
145 for_each_engine(engine, rc6_to_gt(rc6), id)
146 set(uncore, RING_MAX_IDLE(engine->mmio_base), 10);
148 set(uncore, GUC_MAX_IDLE_COUNT, 0xA);
150 set(uncore, GEN6_RC_SLEEP, 0);
153 * 2c: Program Coarse Power Gating Policies.
155 * Bspec's guidance is to use 25us (really 25 * 1280ns) here. What we
156 * use instead is a more conservative estimate for the maximum time
157 * it takes us to service a CS interrupt and submit a new ELSP - that
158 * is the time which the GPU is idle waiting for the CPU to select the
159 * next request to execute. If the idle hysteresis is less than that
160 * interrupt service latency, the hardware will automatically gate
161 * the power well and we will then incur the wake up cost on top of
162 * the service latency. A similar guide from plane_state is that we
163 * do not want the enable hysteresis to less than the wakeup latency.
165 * igt/gem_exec_nop/sequential provides a rough estimate for the
166 * service latency, and puts it around 10us for Broadwell (and other
167 * big core) and around 40us for Broxton (and other low power cores).
168 * [Note that for legacy ringbuffer submission, this is less than 1us!]
169 * However, the wakeup latency on Broxton is closer to 100us. To be
170 * conservative, we have to factor in a context switch on top (due
173 set(uncore, GEN9_MEDIA_PG_IDLE_HYSTERESIS, 250);
174 set(uncore, GEN9_RENDER_PG_IDLE_HYSTERESIS, 250);
177 set(uncore, GEN6_RC6_THRESHOLD, 37500); /* 37.5/125ms per EI */
181 GEN6_RC_CTL_HW_ENABLE |
182 GEN6_RC_CTL_RC6_ENABLE |
183 GEN6_RC_CTL_EI_MODE(1);
186 * WaRsDisableCoarsePowerGating:skl,cnl
187 * - Render/Media PG need to be disabled with RC6.
189 if (!NEEDS_WaRsDisableCoarsePowerGating(rc6_to_i915(rc6)))
190 set(uncore, GEN9_PG_ENABLE,
191 GEN9_RENDER_PG_ENABLE | GEN9_MEDIA_PG_ENABLE);
194 static void gen8_rc6_enable(struct intel_rc6 *rc6)
196 struct intel_uncore *uncore = rc6_to_uncore(rc6);
197 struct intel_engine_cs *engine;
198 enum intel_engine_id id;
200 /* 2b: Program RC6 thresholds.*/
201 set(uncore, GEN6_RC6_WAKE_RATE_LIMIT, 40 << 16);
202 set(uncore, GEN6_RC_EVALUATION_INTERVAL, 125000); /* 12500 * 1280ns */
203 set(uncore, GEN6_RC_IDLE_HYSTERSIS, 25); /* 25 * 1280ns */
204 for_each_engine(engine, rc6_to_gt(rc6), id)
205 set(uncore, RING_MAX_IDLE(engine->mmio_base), 10);
206 set(uncore, GEN6_RC_SLEEP, 0);
207 set(uncore, GEN6_RC6_THRESHOLD, 625); /* 800us/1.28 for TO */
211 GEN6_RC_CTL_HW_ENABLE |
212 GEN7_RC_CTL_TO_MODE |
213 GEN6_RC_CTL_RC6_ENABLE;
216 static void gen6_rc6_enable(struct intel_rc6 *rc6)
218 struct intel_uncore *uncore = rc6_to_uncore(rc6);
219 struct drm_i915_private *i915 = rc6_to_i915(rc6);
220 struct intel_engine_cs *engine;
221 enum intel_engine_id id;
222 u32 rc6vids, rc6_mask;
225 set(uncore, GEN6_RC1_WAKE_RATE_LIMIT, 1000 << 16);
226 set(uncore, GEN6_RC6_WAKE_RATE_LIMIT, 40 << 16 | 30);
227 set(uncore, GEN6_RC6pp_WAKE_RATE_LIMIT, 30);
228 set(uncore, GEN6_RC_EVALUATION_INTERVAL, 125000);
229 set(uncore, GEN6_RC_IDLE_HYSTERSIS, 25);
231 for_each_engine(engine, rc6_to_gt(rc6), id)
232 set(uncore, RING_MAX_IDLE(engine->mmio_base), 10);
234 set(uncore, GEN6_RC_SLEEP, 0);
235 set(uncore, GEN6_RC1e_THRESHOLD, 1000);
236 set(uncore, GEN6_RC6_THRESHOLD, 50000);
237 set(uncore, GEN6_RC6p_THRESHOLD, 150000);
238 set(uncore, GEN6_RC6pp_THRESHOLD, 64000); /* unused */
240 /* We don't use those on Haswell */
241 rc6_mask = GEN6_RC_CTL_RC6_ENABLE;
243 rc6_mask |= GEN6_RC_CTL_RC6p_ENABLE;
245 rc6_mask |= GEN6_RC_CTL_RC6pp_ENABLE;
248 GEN6_RC_CTL_EI_MODE(1) |
249 GEN6_RC_CTL_HW_ENABLE;
252 ret = sandybridge_pcode_read(i915, GEN6_PCODE_READ_RC6VIDS,
254 if (IS_GEN(i915, 6) && ret) {
255 drm_dbg(&i915->drm, "Couldn't check for BIOS workaround\n");
256 } else if (IS_GEN(i915, 6) &&
257 (GEN6_DECODE_RC6_VID(rc6vids & 0xff) < 450)) {
259 "You should update your BIOS. Correcting minimum rc6 voltage (%dmV->%dmV)\n",
260 GEN6_DECODE_RC6_VID(rc6vids & 0xff), 450);
262 rc6vids |= GEN6_ENCODE_RC6_VID(450);
263 ret = sandybridge_pcode_write(i915, GEN6_PCODE_WRITE_RC6VIDS, rc6vids);
266 "Couldn't fix incorrect rc6 voltage\n");
270 /* Check that the pcbr address is not empty. */
271 static int chv_rc6_init(struct intel_rc6 *rc6)
273 struct intel_uncore *uncore = rc6_to_uncore(rc6);
274 struct drm_i915_private *i915 = rc6_to_i915(rc6);
275 resource_size_t pctx_paddr, paddr;
276 resource_size_t pctx_size = 32 * SZ_1K;
279 pcbr = intel_uncore_read(uncore, VLV_PCBR);
280 if ((pcbr >> VLV_PCBR_ADDR_SHIFT) == 0) {
281 drm_dbg(&i915->drm, "BIOS didn't set up PCBR, fixing up\n");
282 paddr = i915->dsm.end + 1 - pctx_size;
283 GEM_BUG_ON(paddr > U32_MAX);
285 pctx_paddr = (paddr & ~4095);
286 intel_uncore_write(uncore, VLV_PCBR, pctx_paddr);
292 static int vlv_rc6_init(struct intel_rc6 *rc6)
294 struct drm_i915_private *i915 = rc6_to_i915(rc6);
295 struct intel_uncore *uncore = rc6_to_uncore(rc6);
296 struct drm_i915_gem_object *pctx;
297 resource_size_t pctx_paddr;
298 resource_size_t pctx_size = 24 * SZ_1K;
301 pcbr = intel_uncore_read(uncore, VLV_PCBR);
303 /* BIOS set it up already, grab the pre-alloc'd space */
304 resource_size_t pcbr_offset;
306 pcbr_offset = (pcbr & ~4095) - i915->dsm.start;
307 pctx = i915_gem_object_create_stolen_for_preallocated(i915,
311 return PTR_ERR(pctx);
316 drm_dbg(&i915->drm, "BIOS didn't set up PCBR, fixing up\n");
319 * From the Gunit register HAS:
320 * The Gfx driver is expected to program this register and ensure
321 * proper allocation within Gfx stolen memory. For example, this
322 * register should be programmed such than the PCBR range does not
323 * overlap with other ranges, such as the frame buffer, protected
324 * memory, or any other relevant ranges.
326 pctx = i915_gem_object_create_stolen(i915, pctx_size);
329 "not enough stolen space for PCTX, disabling\n");
330 return PTR_ERR(pctx);
333 GEM_BUG_ON(range_overflows_end_t(u64,
337 pctx_paddr = i915->dsm.start + pctx->stolen->start;
338 intel_uncore_write(uncore, VLV_PCBR, pctx_paddr);
345 static void chv_rc6_enable(struct intel_rc6 *rc6)
347 struct intel_uncore *uncore = rc6_to_uncore(rc6);
348 struct intel_engine_cs *engine;
349 enum intel_engine_id id;
351 /* 2a: Program RC6 thresholds.*/
352 set(uncore, GEN6_RC6_WAKE_RATE_LIMIT, 40 << 16);
353 set(uncore, GEN6_RC_EVALUATION_INTERVAL, 125000); /* 12500 * 1280ns */
354 set(uncore, GEN6_RC_IDLE_HYSTERSIS, 25); /* 25 * 1280ns */
356 for_each_engine(engine, rc6_to_gt(rc6), id)
357 set(uncore, RING_MAX_IDLE(engine->mmio_base), 10);
358 set(uncore, GEN6_RC_SLEEP, 0);
360 /* TO threshold set to 500 us (0x186 * 1.28 us) */
361 set(uncore, GEN6_RC6_THRESHOLD, 0x186);
363 /* Allows RC6 residency counter to work */
364 set(uncore, VLV_COUNTER_CONTROL,
365 _MASKED_BIT_ENABLE(VLV_COUNT_RANGE_HIGH |
366 VLV_MEDIA_RC6_COUNT_EN |
367 VLV_RENDER_RC6_COUNT_EN));
370 rc6->ctl_enable = GEN7_RC_CTL_TO_MODE;
373 static void vlv_rc6_enable(struct intel_rc6 *rc6)
375 struct intel_uncore *uncore = rc6_to_uncore(rc6);
376 struct intel_engine_cs *engine;
377 enum intel_engine_id id;
379 set(uncore, GEN6_RC6_WAKE_RATE_LIMIT, 0x00280000);
380 set(uncore, GEN6_RC_EVALUATION_INTERVAL, 125000);
381 set(uncore, GEN6_RC_IDLE_HYSTERSIS, 25);
383 for_each_engine(engine, rc6_to_gt(rc6), id)
384 set(uncore, RING_MAX_IDLE(engine->mmio_base), 10);
386 set(uncore, GEN6_RC6_THRESHOLD, 0x557);
388 /* Allows RC6 residency counter to work */
389 set(uncore, VLV_COUNTER_CONTROL,
390 _MASKED_BIT_ENABLE(VLV_COUNT_RANGE_HIGH |
391 VLV_MEDIA_RC0_COUNT_EN |
392 VLV_RENDER_RC0_COUNT_EN |
393 VLV_MEDIA_RC6_COUNT_EN |
394 VLV_RENDER_RC6_COUNT_EN));
397 GEN7_RC_CTL_TO_MODE | VLV_RC_CTL_CTX_RST_PARALLEL;
400 static bool bxt_check_bios_rc6_setup(struct intel_rc6 *rc6)
402 struct intel_uncore *uncore = rc6_to_uncore(rc6);
403 struct drm_i915_private *i915 = rc6_to_i915(rc6);
404 u32 rc6_ctx_base, rc_ctl, rc_sw_target;
405 bool enable_rc6 = true;
407 rc_ctl = intel_uncore_read(uncore, GEN6_RC_CONTROL);
408 rc_sw_target = intel_uncore_read(uncore, GEN6_RC_STATE);
409 rc_sw_target &= RC_SW_TARGET_STATE_MASK;
410 rc_sw_target >>= RC_SW_TARGET_STATE_SHIFT;
411 drm_dbg(&i915->drm, "BIOS enabled RC states: "
412 "HW_CTRL %s HW_RC6 %s SW_TARGET_STATE %x\n",
413 onoff(rc_ctl & GEN6_RC_CTL_HW_ENABLE),
414 onoff(rc_ctl & GEN6_RC_CTL_RC6_ENABLE),
417 if (!(intel_uncore_read(uncore, RC6_LOCATION) & RC6_CTX_IN_DRAM)) {
418 drm_dbg(&i915->drm, "RC6 Base location not set properly.\n");
423 * The exact context size is not known for BXT, so assume a page size
427 intel_uncore_read(uncore, RC6_CTX_BASE) & RC6_CTX_BASE_MASK;
428 if (!(rc6_ctx_base >= i915->dsm_reserved.start &&
429 rc6_ctx_base + PAGE_SIZE < i915->dsm_reserved.end)) {
430 drm_dbg(&i915->drm, "RC6 Base address not as expected.\n");
434 if (!((intel_uncore_read(uncore, PWRCTX_MAXCNT_RCSUNIT) & IDLE_TIME_MASK) > 1 &&
435 (intel_uncore_read(uncore, PWRCTX_MAXCNT_VCSUNIT0) & IDLE_TIME_MASK) > 1 &&
436 (intel_uncore_read(uncore, PWRCTX_MAXCNT_BCSUNIT) & IDLE_TIME_MASK) > 1 &&
437 (intel_uncore_read(uncore, PWRCTX_MAXCNT_VECSUNIT) & IDLE_TIME_MASK) > 1)) {
439 "Engine Idle wait time not set properly.\n");
443 if (!intel_uncore_read(uncore, GEN8_PUSHBUS_CONTROL) ||
444 !intel_uncore_read(uncore, GEN8_PUSHBUS_ENABLE) ||
445 !intel_uncore_read(uncore, GEN8_PUSHBUS_SHIFT)) {
446 drm_dbg(&i915->drm, "Pushbus not setup properly.\n");
450 if (!intel_uncore_read(uncore, GEN6_GFXPAUSE)) {
451 drm_dbg(&i915->drm, "GFX pause not setup properly.\n");
455 if (!intel_uncore_read(uncore, GEN8_MISC_CTRL0)) {
456 drm_dbg(&i915->drm, "GPM control not setup properly.\n");
463 static bool rc6_supported(struct intel_rc6 *rc6)
465 struct drm_i915_private *i915 = rc6_to_i915(rc6);
470 if (intel_vgpu_active(i915))
473 if (is_mock_gt(rc6_to_gt(rc6)))
476 if (IS_GEN9_LP(i915) && !bxt_check_bios_rc6_setup(rc6)) {
477 drm_notice(&i915->drm,
478 "RC6 and powersaving disabled by BIOS\n");
485 static void rpm_get(struct intel_rc6 *rc6)
487 GEM_BUG_ON(rc6->wakeref);
488 pm_runtime_get_sync(&rc6_to_i915(rc6)->drm.pdev->dev);
492 static void rpm_put(struct intel_rc6 *rc6)
494 GEM_BUG_ON(!rc6->wakeref);
495 pm_runtime_put(&rc6_to_i915(rc6)->drm.pdev->dev);
496 rc6->wakeref = false;
499 static bool pctx_corrupted(struct intel_rc6 *rc6)
501 struct drm_i915_private *i915 = rc6_to_i915(rc6);
503 if (!NEEDS_RC6_CTX_CORRUPTION_WA(i915))
506 if (intel_uncore_read(rc6_to_uncore(rc6), GEN8_RC6_CTX_INFO))
509 drm_notice(&i915->drm,
510 "RC6 context corruption, disabling runtime power management\n");
514 static void __intel_rc6_disable(struct intel_rc6 *rc6)
516 struct drm_i915_private *i915 = rc6_to_i915(rc6);
517 struct intel_uncore *uncore = rc6_to_uncore(rc6);
519 intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL);
520 if (INTEL_GEN(i915) >= 9)
521 set(uncore, GEN9_PG_ENABLE, 0);
522 set(uncore, GEN6_RC_CONTROL, 0);
523 set(uncore, GEN6_RC_STATE, 0);
524 intel_uncore_forcewake_put(uncore, FORCEWAKE_ALL);
527 void intel_rc6_init(struct intel_rc6 *rc6)
529 struct drm_i915_private *i915 = rc6_to_i915(rc6);
532 /* Disable runtime-pm until we can save the GPU state with rc6 pctx */
535 if (!rc6_supported(rc6))
538 if (IS_CHERRYVIEW(i915))
539 err = chv_rc6_init(rc6);
540 else if (IS_VALLEYVIEW(i915))
541 err = vlv_rc6_init(rc6);
545 /* Sanitize rc6, ensure it is disabled before we are ready. */
546 __intel_rc6_disable(rc6);
548 rc6->supported = err == 0;
551 void intel_rc6_sanitize(struct intel_rc6 *rc6)
553 memset(rc6->prev_hw_residency, 0, sizeof(rc6->prev_hw_residency));
555 if (rc6->enabled) { /* unbalanced suspend/resume */
557 rc6->enabled = false;
561 __intel_rc6_disable(rc6);
564 void intel_rc6_enable(struct intel_rc6 *rc6)
566 struct drm_i915_private *i915 = rc6_to_i915(rc6);
567 struct intel_uncore *uncore = rc6_to_uncore(rc6);
572 GEM_BUG_ON(rc6->enabled);
574 intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL);
576 if (IS_CHERRYVIEW(i915))
578 else if (IS_VALLEYVIEW(i915))
580 else if (INTEL_GEN(i915) >= 11)
581 gen11_rc6_enable(rc6);
582 else if (INTEL_GEN(i915) >= 9)
583 gen9_rc6_enable(rc6);
584 else if (IS_BROADWELL(i915))
585 gen8_rc6_enable(rc6);
586 else if (INTEL_GEN(i915) >= 6)
587 gen6_rc6_enable(rc6);
589 rc6->manual = rc6->ctl_enable & GEN6_RC_CTL_RC6_ENABLE;
590 if (NEEDS_RC6_CTX_CORRUPTION_WA(i915))
593 intel_uncore_forcewake_put(uncore, FORCEWAKE_ALL);
595 if (unlikely(pctx_corrupted(rc6)))
598 /* rc6 is ready, runtime-pm is go! */
603 void intel_rc6_unpark(struct intel_rc6 *rc6)
605 struct intel_uncore *uncore = rc6_to_uncore(rc6);
610 /* Restore HW timers for automatic RC6 entry while busy */
611 set(uncore, GEN6_RC_CONTROL, rc6->ctl_enable);
614 void intel_rc6_park(struct intel_rc6 *rc6)
616 struct intel_uncore *uncore = rc6_to_uncore(rc6);
622 if (unlikely(pctx_corrupted(rc6))) {
623 intel_rc6_disable(rc6);
630 /* Turn off the HW timers and go directly to rc6 */
631 set(uncore, GEN6_RC_CONTROL, GEN6_RC_CTL_RC6_ENABLE);
633 if (HAS_RC6pp(rc6_to_i915(rc6)))
634 target = 0x6; /* deepest rc6 */
635 else if (HAS_RC6p(rc6_to_i915(rc6)))
636 target = 0x5; /* deep rc6 */
638 target = 0x4; /* normal rc6 */
639 set(uncore, GEN6_RC_STATE, target << RC_SW_TARGET_STATE_SHIFT);
642 void intel_rc6_disable(struct intel_rc6 *rc6)
648 rc6->enabled = false;
650 __intel_rc6_disable(rc6);
653 void intel_rc6_fini(struct intel_rc6 *rc6)
655 struct drm_i915_gem_object *pctx;
657 intel_rc6_disable(rc6);
659 pctx = fetch_and_zero(&rc6->pctx);
661 i915_gem_object_put(pctx);
667 static u64 vlv_residency_raw(struct intel_uncore *uncore, const i915_reg_t reg)
669 u32 lower, upper, tmp;
673 * The register accessed do not need forcewake. We borrow
674 * uncore lock to prevent concurrent access to range reg.
676 lockdep_assert_held(&uncore->lock);
679 * vlv and chv residency counters are 40 bits in width.
680 * With a control bit, we can choose between upper or lower
681 * 32bit window into this counter.
683 * Although we always use the counter in high-range mode elsewhere,
684 * userspace may attempt to read the value before rc6 is initialised,
685 * before we have set the default VLV_COUNTER_CONTROL value. So always
686 * set the high bit to be safe.
688 set(uncore, VLV_COUNTER_CONTROL,
689 _MASKED_BIT_ENABLE(VLV_COUNT_RANGE_HIGH));
690 upper = intel_uncore_read_fw(uncore, reg);
694 set(uncore, VLV_COUNTER_CONTROL,
695 _MASKED_BIT_DISABLE(VLV_COUNT_RANGE_HIGH));
696 lower = intel_uncore_read_fw(uncore, reg);
698 set(uncore, VLV_COUNTER_CONTROL,
699 _MASKED_BIT_ENABLE(VLV_COUNT_RANGE_HIGH));
700 upper = intel_uncore_read_fw(uncore, reg);
701 } while (upper != tmp && --loop);
704 * Everywhere else we always use VLV_COUNTER_CONTROL with the
705 * VLV_COUNT_RANGE_HIGH bit set - so it is safe to leave it set
709 return lower | (u64)upper << 8;
712 u64 intel_rc6_residency_ns(struct intel_rc6 *rc6, const i915_reg_t reg)
714 struct drm_i915_private *i915 = rc6_to_i915(rc6);
715 struct intel_uncore *uncore = rc6_to_uncore(rc6);
716 u64 time_hw, prev_hw, overflow_hw;
717 unsigned int fw_domains;
726 * Store previous hw counter values for counter wrap-around handling.
728 * There are only four interesting registers and they live next to each
729 * other so we can use the relative address, compared to the smallest
730 * one as the index into driver storage.
732 i = (i915_mmio_reg_offset(reg) -
733 i915_mmio_reg_offset(GEN6_GT_GFX_RC6_LOCKED)) / sizeof(u32);
734 if (drm_WARN_ON_ONCE(&i915->drm, i >= ARRAY_SIZE(rc6->cur_residency)))
737 fw_domains = intel_uncore_forcewake_for_reg(uncore, reg, FW_REG_READ);
739 spin_lock_irqsave(&uncore->lock, flags);
740 intel_uncore_forcewake_get__locked(uncore, fw_domains);
742 /* On VLV and CHV, residency time is in CZ units rather than 1.28us */
743 if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
745 div = i915->czclk_freq;
746 overflow_hw = BIT_ULL(40);
747 time_hw = vlv_residency_raw(uncore, reg);
749 /* 833.33ns units on Gen9LP, 1.28us elsewhere. */
750 if (IS_GEN9_LP(i915)) {
758 overflow_hw = BIT_ULL(32);
759 time_hw = intel_uncore_read_fw(uncore, reg);
763 * Counter wrap handling.
765 * But relying on a sufficient frequency of queries otherwise counters
768 prev_hw = rc6->prev_hw_residency[i];
769 rc6->prev_hw_residency[i] = time_hw;
771 /* RC6 delta from last sample. */
772 if (time_hw >= prev_hw)
775 time_hw += overflow_hw - prev_hw;
777 /* Add delta to RC6 extended raw driver copy. */
778 time_hw += rc6->cur_residency[i];
779 rc6->cur_residency[i] = time_hw;
781 intel_uncore_forcewake_put__locked(uncore, fw_domains);
782 spin_unlock_irqrestore(&uncore->lock, flags);
784 return mul_u64_u32_div(time_hw, mul, div);
787 u64 intel_rc6_residency_us(struct intel_rc6 *rc6, i915_reg_t reg)
789 return DIV_ROUND_UP_ULL(intel_rc6_residency_ns(rc6, reg), 1000);
792 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
793 #include "selftest_rc6.c"