diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gt/intel_rps.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gt/intel_rps.c | 1872 |
1 files changed, 1872 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_rps.c b/drivers/gpu/drm/i915/gt/intel_rps.c new file mode 100644 index 000000000000..20d6ee148afc --- /dev/null +++ b/drivers/gpu/drm/i915/gt/intel_rps.c @@ -0,0 +1,1872 @@ +/* + * SPDX-License-Identifier: MIT + * + * Copyright © 2019 Intel Corporation + */ + +#include "i915_drv.h" +#include "intel_gt.h" +#include "intel_gt_irq.h" +#include "intel_gt_pm_irq.h" +#include "intel_rps.h" +#include "intel_sideband.h" +#include "../../../platform/x86/intel_ips.h" + +/* + * Lock protecting IPS related data structures + */ +static DEFINE_SPINLOCK(mchdev_lock); + +static struct intel_gt *rps_to_gt(struct intel_rps *rps) +{ + return container_of(rps, struct intel_gt, rps); +} + +static struct drm_i915_private *rps_to_i915(struct intel_rps *rps) +{ + return rps_to_gt(rps)->i915; +} + +static struct intel_uncore *rps_to_uncore(struct intel_rps *rps) +{ + return rps_to_gt(rps)->uncore; +} + +static u32 rps_pm_sanitize_mask(struct intel_rps *rps, u32 mask) +{ + return mask & ~rps->pm_intrmsk_mbz; +} + +static u32 rps_pm_mask(struct intel_rps *rps, u8 val) +{ + u32 mask = 0; + + /* We use UP_EI_EXPIRED interrupts for both up/down in manual mode */ + if (val > rps->min_freq_softlimit) + mask |= (GEN6_PM_RP_UP_EI_EXPIRED | + GEN6_PM_RP_DOWN_THRESHOLD | + GEN6_PM_RP_DOWN_TIMEOUT); + + if (val < rps->max_freq_softlimit) + mask |= GEN6_PM_RP_UP_EI_EXPIRED | GEN6_PM_RP_UP_THRESHOLD; + + mask &= rps->pm_events; + + return rps_pm_sanitize_mask(rps, ~mask); +} + +static void rps_reset_ei(struct intel_rps *rps) +{ + memset(&rps->ei, 0, sizeof(rps->ei)); +} + +static void rps_enable_interrupts(struct intel_rps *rps) +{ + struct intel_gt *gt = rps_to_gt(rps); + + rps_reset_ei(rps); + + if (IS_VALLEYVIEW(gt->i915)) + /* WaGsvRC0ResidencyMethod:vlv */ + rps->pm_events = GEN6_PM_RP_UP_EI_EXPIRED; + else + rps->pm_events = (GEN6_PM_RP_UP_THRESHOLD | + GEN6_PM_RP_DOWN_THRESHOLD | + GEN6_PM_RP_DOWN_TIMEOUT); + + spin_lock_irq(>->irq_lock); + gen6_gt_pm_enable_irq(gt, rps->pm_events); + spin_unlock_irq(>->irq_lock); + + intel_uncore_write(gt->uncore, GEN6_PMINTRMSK, + rps_pm_mask(rps, rps->cur_freq)); +} + +static void gen6_rps_reset_interrupts(struct intel_rps *rps) +{ + gen6_gt_pm_reset_iir(rps_to_gt(rps), GEN6_PM_RPS_EVENTS); +} + +static void gen11_rps_reset_interrupts(struct intel_rps *rps) +{ + while (gen11_gt_reset_one_iir(rps_to_gt(rps), 0, GEN11_GTPM)) + ; +} + +static void rps_reset_interrupts(struct intel_rps *rps) +{ + struct intel_gt *gt = rps_to_gt(rps); + + spin_lock_irq(>->irq_lock); + if (INTEL_GEN(gt->i915) >= 11) + gen11_rps_reset_interrupts(rps); + else + gen6_rps_reset_interrupts(rps); + + rps->pm_iir = 0; + spin_unlock_irq(>->irq_lock); +} + +static void rps_disable_interrupts(struct intel_rps *rps) +{ + struct intel_gt *gt = rps_to_gt(rps); + + rps->pm_events = 0; + + intel_uncore_write(gt->uncore, GEN6_PMINTRMSK, + rps_pm_sanitize_mask(rps, ~0u)); + + spin_lock_irq(>->irq_lock); + gen6_gt_pm_disable_irq(gt, GEN6_PM_RPS_EVENTS); + spin_unlock_irq(>->irq_lock); + + intel_synchronize_irq(gt->i915); + + /* + * Now that we will not be generating any more work, flush any + * outstanding tasks. As we are called on the RPS idle path, + * we will reset the GPU to minimum frequencies, so the current + * state of the worker can be discarded. + */ + cancel_work_sync(&rps->work); + + rps_reset_interrupts(rps); +} + +static const struct cparams { + u16 i; + u16 t; + u16 m; + u16 c; +} cparams[] = { + { 1, 1333, 301, 28664 }, + { 1, 1066, 294, 24460 }, + { 1, 800, 294, 25192 }, + { 0, 1333, 276, 27605 }, + { 0, 1066, 276, 27605 }, + { 0, 800, 231, 23784 }, +}; + +static void gen5_rps_init(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + struct intel_uncore *uncore = rps_to_uncore(rps); + u8 fmax, fmin, fstart; + u32 rgvmodectl; + int c_m, i; + + if (i915->fsb_freq <= 3200) + c_m = 0; + else if (i915->fsb_freq <= 4800) + c_m = 1; + else + c_m = 2; + + for (i = 0; i < ARRAY_SIZE(cparams); i++) { + if (cparams[i].i == c_m && cparams[i].t == i915->mem_freq) { + rps->ips.m = cparams[i].m; + rps->ips.c = cparams[i].c; + break; + } + } + + rgvmodectl = intel_uncore_read(uncore, MEMMODECTL); + + /* Set up min, max, and cur for interrupt handling */ + fmax = (rgvmodectl & MEMMODE_FMAX_MASK) >> MEMMODE_FMAX_SHIFT; + fmin = (rgvmodectl & MEMMODE_FMIN_MASK); + fstart = (rgvmodectl & MEMMODE_FSTART_MASK) >> + MEMMODE_FSTART_SHIFT; + DRM_DEBUG_DRIVER("fmax: %d, fmin: %d, fstart: %d\n", + fmax, fmin, fstart); + + rps->min_freq = fmax; + rps->max_freq = fmin; + + rps->idle_freq = rps->min_freq; + rps->cur_freq = rps->idle_freq; +} + +static unsigned long +__ips_chipset_val(struct intel_ips *ips) +{ + struct intel_uncore *uncore = + rps_to_uncore(container_of(ips, struct intel_rps, ips)); + unsigned long now = jiffies_to_msecs(jiffies), dt; + unsigned long result; + u64 total, delta; + + lockdep_assert_held(&mchdev_lock); + + /* + * Prevent division-by-zero if we are asking too fast. + * Also, we don't get interesting results if we are polling + * faster than once in 10ms, so just return the saved value + * in such cases. + */ + dt = now - ips->last_time1; + if (dt <= 10) + return ips->chipset_power; + + /* FIXME: handle per-counter overflow */ + total = intel_uncore_read(uncore, DMIEC); + total += intel_uncore_read(uncore, DDREC); + total += intel_uncore_read(uncore, CSIEC); + + delta = total - ips->last_count1; + + result = div_u64(div_u64(ips->m * delta, dt) + ips->c, 10); + + ips->last_count1 = total; + ips->last_time1 = now; + + ips->chipset_power = result; + + return result; +} + +static unsigned long ips_mch_val(struct intel_uncore *uncore) +{ + unsigned int m, x, b; + u32 tsfs; + + tsfs = intel_uncore_read(uncore, TSFS); + x = intel_uncore_read8(uncore, TR1); + + b = tsfs & TSFS_INTR_MASK; + m = (tsfs & TSFS_SLOPE_MASK) >> TSFS_SLOPE_SHIFT; + + return m * x / 127 - b; +} + +static int _pxvid_to_vd(u8 pxvid) +{ + if (pxvid == 0) + return 0; + + if (pxvid >= 8 && pxvid < 31) + pxvid = 31; + + return (pxvid + 2) * 125; +} + +static u32 pvid_to_extvid(struct drm_i915_private *i915, u8 pxvid) +{ + const int vd = _pxvid_to_vd(pxvid); + + if (INTEL_INFO(i915)->is_mobile) + return max(vd - 1125, 0); + + return vd; +} + +static void __gen5_ips_update(struct intel_ips *ips) +{ + struct intel_uncore *uncore = + rps_to_uncore(container_of(ips, struct intel_rps, ips)); + u64 now, delta, dt; + u32 count; + + lockdep_assert_held(&mchdev_lock); + + now = ktime_get_raw_ns(); + dt = now - ips->last_time2; + do_div(dt, NSEC_PER_MSEC); + + /* Don't divide by 0 */ + if (dt <= 10) + return; + + count = intel_uncore_read(uncore, GFXEC); + delta = count - ips->last_count2; + + ips->last_count2 = count; + ips->last_time2 = now; + + /* More magic constants... */ + ips->gfx_power = div_u64(delta * 1181, dt * 10); +} + +static void gen5_rps_update(struct intel_rps *rps) +{ + spin_lock_irq(&mchdev_lock); + __gen5_ips_update(&rps->ips); + spin_unlock_irq(&mchdev_lock); +} + +static bool gen5_rps_set(struct intel_rps *rps, u8 val) +{ + struct intel_uncore *uncore = rps_to_uncore(rps); + u16 rgvswctl; + + lockdep_assert_held(&mchdev_lock); + + rgvswctl = intel_uncore_read16(uncore, MEMSWCTL); + if (rgvswctl & MEMCTL_CMD_STS) { + DRM_DEBUG("gpu busy, RCS change rejected\n"); + return false; /* still busy with another command */ + } + + /* Invert the frequency bin into an ips delay */ + val = rps->max_freq - val; + val = rps->min_freq + val; + + rgvswctl = + (MEMCTL_CMD_CHFREQ << MEMCTL_CMD_SHIFT) | + (val << MEMCTL_FREQ_SHIFT) | + MEMCTL_SFCAVM; + intel_uncore_write16(uncore, MEMSWCTL, rgvswctl); + intel_uncore_posting_read16(uncore, MEMSWCTL); + + rgvswctl |= MEMCTL_CMD_STS; + intel_uncore_write16(uncore, MEMSWCTL, rgvswctl); + + return true; +} + +static unsigned long intel_pxfreq(u32 vidfreq) +{ + int div = (vidfreq & 0x3f0000) >> 16; + int post = (vidfreq & 0x3000) >> 12; + int pre = (vidfreq & 0x7); + + if (!pre) + return 0; + + return div * 133333 / (pre << post); +} + +static unsigned int init_emon(struct intel_uncore *uncore) +{ + u8 pxw[16]; + int i; + + /* Disable to program */ + intel_uncore_write(uncore, ECR, 0); + intel_uncore_posting_read(uncore, ECR); + + /* Program energy weights for various events */ + intel_uncore_write(uncore, SDEW, 0x15040d00); + intel_uncore_write(uncore, CSIEW0, 0x007f0000); + intel_uncore_write(uncore, CSIEW1, 0x1e220004); + intel_uncore_write(uncore, CSIEW2, 0x04000004); + + for (i = 0; i < 5; i++) + intel_uncore_write(uncore, PEW(i), 0); + for (i = 0; i < 3; i++) + intel_uncore_write(uncore, DEW(i), 0); + + /* Program P-state weights to account for frequency power adjustment */ + for (i = 0; i < 16; i++) { + u32 pxvidfreq = intel_uncore_read(uncore, PXVFREQ(i)); + unsigned int freq = intel_pxfreq(pxvidfreq); + unsigned int vid = + (pxvidfreq & PXVFREQ_PX_MASK) >> PXVFREQ_PX_SHIFT; + unsigned int val; + + val = vid * vid * freq / 1000 * 255; + val /= 127 * 127 * 900; + + pxw[i] = val; + } + /* Render standby states get 0 weight */ + pxw[14] = 0; + pxw[15] = 0; + + for (i = 0; i < 4; i++) { + intel_uncore_write(uncore, PXW(i), + pxw[i * 4 + 0] << 24 | + pxw[i * 4 + 1] << 16 | + pxw[i * 4 + 2] << 8 | + pxw[i * 4 + 3] << 0); + } + + /* Adjust magic regs to magic values (more experimental results) */ + intel_uncore_write(uncore, OGW0, 0); + intel_uncore_write(uncore, OGW1, 0); + intel_uncore_write(uncore, EG0, 0x00007f00); + intel_uncore_write(uncore, EG1, 0x0000000e); + intel_uncore_write(uncore, EG2, 0x000e0000); + intel_uncore_write(uncore, EG3, 0x68000300); + intel_uncore_write(uncore, EG4, 0x42000000); + intel_uncore_write(uncore, EG5, 0x00140031); + intel_uncore_write(uncore, EG6, 0); + intel_uncore_write(uncore, EG7, 0); + + for (i = 0; i < 8; i++) + intel_uncore_write(uncore, PXWL(i), 0); + + /* Enable PMON + select events */ + intel_uncore_write(uncore, ECR, 0x80000019); + + return intel_uncore_read(uncore, LCFUSE02) & LCFUSE_HIV_MASK; +} + +static bool gen5_rps_enable(struct intel_rps *rps) +{ + struct intel_uncore *uncore = rps_to_uncore(rps); + u8 fstart, vstart; + u32 rgvmodectl; + + spin_lock_irq(&mchdev_lock); + + rgvmodectl = intel_uncore_read(uncore, MEMMODECTL); + + /* Enable temp reporting */ + intel_uncore_write16(uncore, PMMISC, + intel_uncore_read16(uncore, PMMISC) | MCPPCE_EN); + intel_uncore_write16(uncore, TSC1, + intel_uncore_read16(uncore, TSC1) | TSE); + + /* 100ms RC evaluation intervals */ + intel_uncore_write(uncore, RCUPEI, 100000); + intel_uncore_write(uncore, RCDNEI, 100000); + + /* Set max/min thresholds to 90ms and 80ms respectively */ + intel_uncore_write(uncore, RCBMAXAVG, 90000); + intel_uncore_write(uncore, RCBMINAVG, 80000); + + intel_uncore_write(uncore, MEMIHYST, 1); + + /* Set up min, max, and cur for interrupt handling */ + fstart = (rgvmodectl & MEMMODE_FSTART_MASK) >> + MEMMODE_FSTART_SHIFT; + + vstart = (intel_uncore_read(uncore, PXVFREQ(fstart)) & + PXVFREQ_PX_MASK) >> PXVFREQ_PX_SHIFT; + + intel_uncore_write(uncore, + MEMINTREN, + MEMINT_CX_SUPR_EN | MEMINT_EVAL_CHG_EN); + + intel_uncore_write(uncore, VIDSTART, vstart); + intel_uncore_posting_read(uncore, VIDSTART); + + rgvmodectl |= MEMMODE_SWMODE_EN; + intel_uncore_write(uncore, MEMMODECTL, rgvmodectl); + + if (wait_for_atomic((intel_uncore_read(uncore, MEMSWCTL) & + MEMCTL_CMD_STS) == 0, 10)) + DRM_ERROR("stuck trying to change perf mode\n"); + mdelay(1); + + gen5_rps_set(rps, rps->cur_freq); + + rps->ips.last_count1 = intel_uncore_read(uncore, DMIEC); + rps->ips.last_count1 += intel_uncore_read(uncore, DDREC); + rps->ips.last_count1 += intel_uncore_read(uncore, CSIEC); + rps->ips.last_time1 = jiffies_to_msecs(jiffies); + + rps->ips.last_count2 = intel_uncore_read(uncore, GFXEC); + rps->ips.last_time2 = ktime_get_raw_ns(); + + spin_unlock_irq(&mchdev_lock); + + rps->ips.corr = init_emon(uncore); + + return true; +} + +static void gen5_rps_disable(struct intel_rps *rps) +{ + struct intel_uncore *uncore = rps_to_uncore(rps); + u16 rgvswctl; + + spin_lock_irq(&mchdev_lock); + + rgvswctl = intel_uncore_read16(uncore, MEMSWCTL); + + /* Ack interrupts, disable EFC interrupt */ + intel_uncore_write(uncore, MEMINTREN, + intel_uncore_read(uncore, MEMINTREN) & + ~MEMINT_EVAL_CHG_EN); + intel_uncore_write(uncore, MEMINTRSTS, MEMINT_EVAL_CHG); + intel_uncore_write(uncore, DEIER, + intel_uncore_read(uncore, DEIER) & ~DE_PCU_EVENT); + intel_uncore_write(uncore, DEIIR, DE_PCU_EVENT); + intel_uncore_write(uncore, DEIMR, + intel_uncore_read(uncore, DEIMR) | DE_PCU_EVENT); + + /* Go back to the starting frequency */ + gen5_rps_set(rps, rps->idle_freq); + mdelay(1); + rgvswctl |= MEMCTL_CMD_STS; + intel_uncore_write(uncore, MEMSWCTL, rgvswctl); + mdelay(1); + + spin_unlock_irq(&mchdev_lock); +} + +static u32 rps_limits(struct intel_rps *rps, u8 val) +{ + u32 limits; + + /* + * Only set the down limit when we've reached the lowest level to avoid + * getting more interrupts, otherwise leave this clear. This prevents a + * race in the hw when coming out of rc6: There's a tiny window where + * the hw runs at the minimal clock before selecting the desired + * frequency, if the down threshold expires in that window we will not + * receive a down interrupt. + */ + if (INTEL_GEN(rps_to_i915(rps)) >= 9) { + limits = rps->max_freq_softlimit << 23; + if (val <= rps->min_freq_softlimit) + limits |= rps->min_freq_softlimit << 14; + } else { + limits = rps->max_freq_softlimit << 24; + if (val <= rps->min_freq_softlimit) + limits |= rps->min_freq_softlimit << 16; + } + + return limits; +} + +static void rps_set_power(struct intel_rps *rps, int new_power) +{ + struct intel_uncore *uncore = rps_to_uncore(rps); + struct drm_i915_private *i915 = rps_to_i915(rps); + u32 threshold_up = 0, threshold_down = 0; /* in % */ + u32 ei_up = 0, ei_down = 0; + + lockdep_assert_held(&rps->power.mutex); + + if (new_power == rps->power.mode) + return; + + /* Note the units here are not exactly 1us, but 1280ns. */ + switch (new_power) { + case LOW_POWER: + /* Upclock if more than 95% busy over 16ms */ + ei_up = 16000; + threshold_up = 95; + + /* Downclock if less than 85% busy over 32ms */ + ei_down = 32000; + threshold_down = 85; + break; + + case BETWEEN: + /* Upclock if more than 90% busy over 13ms */ + ei_up = 13000; + threshold_up = 90; + + /* Downclock if less than 75% busy over 32ms */ + ei_down = 32000; + threshold_down = 75; + break; + + case HIGH_POWER: + /* Upclock if more than 85% busy over 10ms */ + ei_up = 10000; + threshold_up = 85; + + /* Downclock if less than 60% busy over 32ms */ + ei_down = 32000; + threshold_down = 60; + break; + } + + /* When byt can survive without system hang with dynamic + * sw freq adjustments, this restriction can be lifted. + */ + if (IS_VALLEYVIEW(i915)) + goto skip_hw_write; + + intel_uncore_write(uncore, GEN6_RP_UP_EI, + GT_INTERVAL_FROM_US(i915, ei_up)); + intel_uncore_write(uncore, GEN6_RP_UP_THRESHOLD, + GT_INTERVAL_FROM_US(i915, + ei_up * threshold_up / 100)); + + intel_uncore_write(uncore, GEN6_RP_DOWN_EI, + GT_INTERVAL_FROM_US(i915, ei_down)); + intel_uncore_write(uncore, GEN6_RP_DOWN_THRESHOLD, + GT_INTERVAL_FROM_US(i915, + ei_down * threshold_down / 100)); + + intel_uncore_write(uncore, GEN6_RP_CONTROL, + (INTEL_GEN(i915) > 9 ? 0 : GEN6_RP_MEDIA_TURBO) | + GEN6_RP_MEDIA_HW_NORMAL_MODE | + GEN6_RP_MEDIA_IS_GFX | + GEN6_RP_ENABLE | + GEN6_RP_UP_BUSY_AVG | + GEN6_RP_DOWN_IDLE_AVG); + +skip_hw_write: + rps->power.mode = new_power; + rps->power.up_threshold = threshold_up; + rps->power.down_threshold = threshold_down; +} + +static void gen6_rps_set_thresholds(struct intel_rps *rps, u8 val) +{ + int new_power; + + new_power = rps->power.mode; + switch (rps->power.mode) { + case LOW_POWER: + if (val > rps->efficient_freq + 1 && + val > rps->cur_freq) + new_power = BETWEEN; + break; + + case BETWEEN: + if (val <= rps->efficient_freq && + val < rps->cur_freq) + new_power = LOW_POWER; + else if (val >= rps->rp0_freq && + val > rps->cur_freq) + new_power = HIGH_POWER; + break; + + case HIGH_POWER: + if (val < (rps->rp1_freq + rps->rp0_freq) >> 1 && + val < rps->cur_freq) + new_power = BETWEEN; + break; + } + /* Max/min bins are special */ + if (val <= rps->min_freq_softlimit) + new_power = LOW_POWER; + if (val >= rps->max_freq_softlimit) + new_power = HIGH_POWER; + + mutex_lock(&rps->power.mutex); + if (rps->power.interactive) + new_power = HIGH_POWER; + rps_set_power(rps, new_power); + mutex_unlock(&rps->power.mutex); +} + +void intel_rps_mark_interactive(struct intel_rps *rps, bool interactive) +{ + mutex_lock(&rps->power.mutex); + if (interactive) { + if (!rps->power.interactive++ && rps->active) + rps_set_power(rps, HIGH_POWER); + } else { + GEM_BUG_ON(!rps->power.interactive); + rps->power.interactive--; + } + mutex_unlock(&rps->power.mutex); +} + +static int gen6_rps_set(struct intel_rps *rps, u8 val) +{ + struct intel_uncore *uncore = rps_to_uncore(rps); + struct drm_i915_private *i915 = rps_to_i915(rps); + u32 swreq; + + if (INTEL_GEN(i915) >= 9) + swreq = GEN9_FREQUENCY(val); + else if (IS_HASWELL(i915) || IS_BROADWELL(i915)) + swreq = HSW_FREQUENCY(val); + else + swreq = (GEN6_FREQUENCY(val) | + GEN6_OFFSET(0) | + GEN6_AGGRESSIVE_TURBO); + intel_uncore_write(uncore, GEN6_RPNSWREQ, swreq); + + return 0; +} + +static int vlv_rps_set(struct intel_rps *rps, u8 val) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + int err; + + vlv_punit_get(i915); + err = vlv_punit_write(i915, PUNIT_REG_GPU_FREQ_REQ, val); + vlv_punit_put(i915); + + return err; +} + +static int rps_set(struct intel_rps *rps, u8 val) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + int err; + + if (INTEL_GEN(i915) < 6) + return 0; + + if (val == rps->last_freq) + return 0; + + if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) + err = vlv_rps_set(rps, val); + else + err = gen6_rps_set(rps, val); + if (err) + return err; + + gen6_rps_set_thresholds(rps, val); + rps->last_freq = val; + + return 0; +} + +void intel_rps_unpark(struct intel_rps *rps) +{ + u8 freq; + + if (!rps->enabled) + return; + + /* + * Use the user's desired frequency as a guide, but for better + * performance, jump directly to RPe as our starting frequency. + */ + mutex_lock(&rps->lock); + rps->active = true; + freq = max(rps->cur_freq, rps->efficient_freq), + freq = clamp(freq, rps->min_freq_softlimit, rps->max_freq_softlimit); + intel_rps_set(rps, freq); + rps->last_adj = 0; + mutex_unlock(&rps->lock); + + if (INTEL_GEN(rps_to_i915(rps)) >= 6) + rps_enable_interrupts(rps); + + if (IS_GEN(rps_to_i915(rps), 5)) + gen5_rps_update(rps); +} + +void intel_rps_park(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + + if (!rps->enabled) + return; + + if (INTEL_GEN(i915) >= 6) + rps_disable_interrupts(rps); + + rps->active = false; + if (rps->last_freq <= rps->idle_freq) + return; + + /* + * The punit delays the write of the frequency and voltage until it + * determines the GPU is awake. During normal usage we don't want to + * waste power changing the frequency if the GPU is sleeping (rc6). + * However, the GPU and driver is now idle and we do not want to delay + * switching to minimum voltage (reducing power whilst idle) as we do + * not expect to be woken in the near future and so must flush the + * change by waking the device. + * + * We choose to take the media powerwell (either would do to trick the + * punit into committing the voltage change) as that takes a lot less + * power than the render powerwell. + */ + intel_uncore_forcewake_get(rps_to_uncore(rps), FORCEWAKE_MEDIA); + rps_set(rps, rps->idle_freq); + intel_uncore_forcewake_put(rps_to_uncore(rps), FORCEWAKE_MEDIA); +} + +void intel_rps_boost(struct i915_request *rq) +{ + struct intel_rps *rps = &rq->engine->gt->rps; + unsigned long flags; + + if (i915_request_signaled(rq) || !rps->active) + return; + + /* Serializes with i915_request_retire() */ + spin_lock_irqsave(&rq->lock, flags); + if (!i915_request_has_waitboost(rq) && + !dma_fence_is_signaled_locked(&rq->fence)) { + rq->flags |= I915_REQUEST_WAITBOOST; + + if (!atomic_fetch_inc(&rps->num_waiters) && + READ_ONCE(rps->cur_freq) < rps->boost_freq) + schedule_work(&rps->work); + + atomic_inc(&rps->boosts); + } + spin_unlock_irqrestore(&rq->lock, flags); +} + +int intel_rps_set(struct intel_rps *rps, u8 val) +{ + int err = 0; + + lockdep_assert_held(&rps->lock); + GEM_BUG_ON(val > rps->max_freq); + GEM_BUG_ON(val < rps->min_freq); + + if (rps->active) { + err = rps_set(rps, val); + + /* + * Make sure we continue to get interrupts + * until we hit the minimum or maximum frequencies. + */ + if (INTEL_GEN(rps_to_i915(rps)) >= 6) { + struct intel_uncore *uncore = rps_to_uncore(rps); + + intel_uncore_write(uncore, GEN6_RP_INTERRUPT_LIMITS, + rps_limits(rps, val)); + + intel_uncore_write(uncore, GEN6_PMINTRMSK, + rps_pm_mask(rps, val)); + } + } + + if (err == 0) + rps->cur_freq = val; + + return err; +} + +static void gen6_rps_init(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + struct intel_uncore *uncore = rps_to_uncore(rps); + + /* All of these values are in units of 50MHz */ + + /* static values from HW: RP0 > RP1 > RPn (min_freq) */ + if (IS_GEN9_LP(i915)) { + u32 rp_state_cap = intel_uncore_read(uncore, BXT_RP_STATE_CAP); + + rps->rp0_freq = (rp_state_cap >> 16) & 0xff; + rps->rp1_freq = (rp_state_cap >> 8) & 0xff; + rps->min_freq = (rp_state_cap >> 0) & 0xff; + } else { + u32 rp_state_cap = intel_uncore_read(uncore, GEN6_RP_STATE_CAP); + + rps->rp0_freq = (rp_state_cap >> 0) & 0xff; + rps->rp1_freq = (rp_state_cap >> 8) & 0xff; + rps->min_freq = (rp_state_cap >> 16) & 0xff; + } + + /* hw_max = RP0 until we check for overclocking */ + rps->max_freq = rps->rp0_freq; + + rps->efficient_freq = rps->rp1_freq; + if (IS_HASWELL(i915) || IS_BROADWELL(i915) || + IS_GEN9_BC(i915) || INTEL_GEN(i915) >= 10) { + u32 ddcc_status = 0; + + if (sandybridge_pcode_read(i915, + HSW_PCODE_DYNAMIC_DUTY_CYCLE_CONTROL, + &ddcc_status, NULL) == 0) + rps->efficient_freq = + clamp_t(u8, + (ddcc_status >> 8) & 0xff, + rps->min_freq, + rps->max_freq); + } + + if (IS_GEN9_BC(i915) || INTEL_GEN(i915) >= 10) { + /* Store the frequency values in 16.66 MHZ units, which is + * the natural hardware unit for SKL + */ + rps->rp0_freq *= GEN9_FREQ_SCALER; + rps->rp1_freq *= GEN9_FREQ_SCALER; + rps->min_freq *= GEN9_FREQ_SCALER; + rps->max_freq *= GEN9_FREQ_SCALER; + rps->efficient_freq *= GEN9_FREQ_SCALER; + } +} + +static bool rps_reset(struct intel_rps *rps) +{ + /* force a reset */ + rps->power.mode = -1; + rps->last_freq = -1; + + if (rps_set(rps, rps->min_freq)) { + DRM_ERROR("Failed to reset RPS to initial values\n"); + return false; + } + + rps->cur_freq = rps->min_freq; + return true; +} + +/* See the Gen9_GT_PM_Programming_Guide doc for the below */ +static bool gen9_rps_enable(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + struct intel_uncore *uncore = rps_to_uncore(rps); + + /* Program defaults and thresholds for RPS */ + if (IS_GEN(i915, 9)) + intel_uncore_write_fw(uncore, GEN6_RC_VIDEO_FREQ, + GEN9_FREQUENCY(rps->rp1_freq)); + + /* 1 second timeout */ + intel_uncore_write_fw(uncore, GEN6_RP_DOWN_TIMEOUT, + GT_INTERVAL_FROM_US(i915, 1000000)); + + intel_uncore_write_fw(uncore, GEN6_RP_IDLE_HYSTERSIS, 0xa); + + return rps_reset(rps); +} + +static bool gen8_rps_enable(struct intel_rps *rps) +{ + struct intel_uncore *uncore = rps_to_uncore(rps); + + intel_uncore_write_fw(uncore, GEN6_RC_VIDEO_FREQ, + HSW_FREQUENCY(rps->rp1_freq)); + + /* NB: Docs say 1s, and 1000000 - which aren't equivalent */ + intel_uncore_write_fw(uncore, GEN6_RP_DOWN_TIMEOUT, + 100000000 / 128); /* 1 second timeout */ + + intel_uncore_write_fw(uncore, GEN6_RP_IDLE_HYSTERSIS, 10); + + return rps_reset(rps); +} + +static bool gen6_rps_enable(struct intel_rps *rps) +{ + struct intel_uncore *uncore = rps_to_uncore(rps); + + /* Power down if completely idle for over 50ms */ + intel_uncore_write_fw(uncore, GEN6_RP_DOWN_TIMEOUT, 50000); + intel_uncore_write_fw(uncore, GEN6_RP_IDLE_HYSTERSIS, 10); + + return rps_reset(rps); +} + +static int chv_rps_max_freq(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + u32 val; + + val = vlv_punit_read(i915, FB_GFX_FMAX_AT_VMAX_FUSE); + + switch (RUNTIME_INFO(i915)->sseu.eu_total) { + case 8: + /* (2 * 4) config */ + val >>= FB_GFX_FMAX_AT_VMAX_2SS4EU_FUSE_SHIFT; + break; + case 12: + /* (2 * 6) config */ + val >>= FB_GFX_FMAX_AT_VMAX_2SS6EU_FUSE_SHIFT; + break; + case 16: + /* (2 * 8) config */ + default: + /* Setting (2 * 8) Min RP0 for any other combination */ + val >>= FB_GFX_FMAX_AT_VMAX_2SS8EU_FUSE_SHIFT; + break; + } + + return val & FB_GFX_FREQ_FUSE_MASK; +} + +static int chv_rps_rpe_freq(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + u32 val; + + val = vlv_punit_read(i915, PUNIT_GPU_DUTYCYCLE_REG); + val >>= PUNIT_GPU_DUTYCYCLE_RPE_FREQ_SHIFT; + + return val & PUNIT_GPU_DUTYCYCLE_RPE_FREQ_MASK; +} + +static int chv_rps_guar_freq(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + u32 val; + + val = vlv_punit_read(i915, FB_GFX_FMAX_AT_VMAX_FUSE); + + return val & FB_GFX_FREQ_FUSE_MASK; +} + +static u32 chv_rps_min_freq(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + u32 val; + + val = vlv_punit_read(i915, FB_GFX_FMIN_AT_VMIN_FUSE); + val >>= FB_GFX_FMIN_AT_VMIN_FUSE_SHIFT; + + return val & FB_GFX_FREQ_FUSE_MASK; +} + +static bool chv_rps_enable(struct intel_rps *rps) +{ + struct intel_uncore *uncore = rps_to_uncore(rps); + struct drm_i915_private *i915 = rps_to_i915(rps); + u32 val; + + /* 1: Program defaults and thresholds for RPS*/ + intel_uncore_write_fw(uncore, GEN6_RP_DOWN_TIMEOUT, 1000000); + intel_uncore_write_fw(uncore, GEN6_RP_UP_THRESHOLD, 59400); + intel_uncore_write_fw(uncore, GEN6_RP_DOWN_THRESHOLD, 245000); + intel_uncore_write_fw(uncore, GEN6_RP_UP_EI, 66000); + intel_uncore_write_fw(uncore, GEN6_RP_DOWN_EI, 350000); + + intel_uncore_write_fw(uncore, GEN6_RP_IDLE_HYSTERSIS, 10); + + /* 2: Enable RPS */ + intel_uncore_write_fw(uncore, GEN6_RP_CONTROL, + GEN6_RP_MEDIA_HW_NORMAL_MODE | + GEN6_RP_MEDIA_IS_GFX | + GEN6_RP_ENABLE | + GEN6_RP_UP_BUSY_AVG | + GEN6_RP_DOWN_IDLE_AVG); + + /* Setting Fixed Bias */ + vlv_punit_get(i915); + + val = VLV_OVERRIDE_EN | VLV_SOC_TDP_EN | CHV_BIAS_CPU_50_SOC_50; + vlv_punit_write(i915, VLV_TURBO_SOC_OVERRIDE, val); + + val = vlv_punit_read(i915, PUNIT_REG_GPU_FREQ_STS); + + vlv_punit_put(i915); + + /* RPS code assumes GPLL is used */ + WARN_ONCE((val & GPLLENABLE) == 0, "GPLL not enabled\n"); + + DRM_DEBUG_DRIVER("GPLL enabled? %s\n", yesno(val & GPLLENABLE)); + DRM_DEBUG_DRIVER("GPU status: 0x%08x\n", val); + + return rps_reset(rps); +} + +static int vlv_rps_guar_freq(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + u32 val, rp1; + + val = vlv_nc_read(i915, IOSF_NC_FB_GFX_FREQ_FUSE); + + rp1 = val & FB_GFX_FGUARANTEED_FREQ_FUSE_MASK; + rp1 >>= FB_GFX_FGUARANTEED_FREQ_FUSE_SHIFT; + + return rp1; +} + +static int vlv_rps_max_freq(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + u32 val, rp0; + + val = vlv_nc_read(i915, IOSF_NC_FB_GFX_FREQ_FUSE); + + rp0 = (val & FB_GFX_MAX_FREQ_FUSE_MASK) >> FB_GFX_MAX_FREQ_FUSE_SHIFT; + /* Clamp to max */ + rp0 = min_t(u32, rp0, 0xea); + + return rp0; +} + +static int vlv_rps_rpe_freq(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + u32 val, rpe; + + val = vlv_nc_read(i915, IOSF_NC_FB_GFX_FMAX_FUSE_LO); + rpe = (val & FB_FMAX_VMIN_FREQ_LO_MASK) >> FB_FMAX_VMIN_FREQ_LO_SHIFT; + val = vlv_nc_read(i915, IOSF_NC_FB_GFX_FMAX_FUSE_HI); + rpe |= (val & FB_FMAX_VMIN_FREQ_HI_MASK) << 5; + + return rpe; +} + +static int vlv_rps_min_freq(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + u32 val; + + val = vlv_punit_read(i915, PUNIT_REG_GPU_LFM) & 0xff; + /* + * According to the BYT Punit GPU turbo HAS 1.1.6.3 the minimum value + * for the minimum frequency in GPLL mode is 0xc1. Contrary to this on + * a BYT-M B0 the above register contains 0xbf. Moreover when setting + * a frequency Punit will not allow values below 0xc0. Clamp it 0xc0 + * to make sure it matches what Punit accepts. + */ + return max_t(u32, val, 0xc0); +} + +static bool vlv_rps_enable(struct intel_rps *rps) +{ + struct intel_uncore *uncore = rps_to_uncore(rps); + struct drm_i915_private *i915 = rps_to_i915(rps); + u32 val; + + intel_uncore_write_fw(uncore, GEN6_RP_DOWN_TIMEOUT, 1000000); + intel_uncore_write_fw(uncore, GEN6_RP_UP_THRESHOLD, 59400); + intel_uncore_write_fw(uncore, GEN6_RP_DOWN_THRESHOLD, 245000); + intel_uncore_write_fw(uncore, GEN6_RP_UP_EI, 66000); + intel_uncore_write_fw(uncore, GEN6_RP_DOWN_EI, 350000); + + intel_uncore_write_fw(uncore, GEN6_RP_IDLE_HYSTERSIS, 10); + + intel_uncore_write_fw(uncore, GEN6_RP_CONTROL, + GEN6_RP_MEDIA_TURBO | + GEN6_RP_MEDIA_HW_NORMAL_MODE | + GEN6_RP_MEDIA_IS_GFX | + GEN6_RP_ENABLE | + GEN6_RP_UP_BUSY_AVG | + GEN6_RP_DOWN_IDLE_CONT); + + vlv_punit_get(i915); + + /* Setting Fixed Bias */ + val = VLV_OVERRIDE_EN | VLV_SOC_TDP_EN | VLV_BIAS_CPU_125_SOC_875; + vlv_punit_write(i915, VLV_TURBO_SOC_OVERRIDE, val); + + val = vlv_punit_read(i915, PUNIT_REG_GPU_FREQ_STS); + + vlv_punit_put(i915); + + /* RPS code assumes GPLL is used */ + WARN_ONCE((val & GPLLENABLE) == 0, "GPLL not enabled\n"); + + DRM_DEBUG_DRIVER("GPLL enabled? %s\n", yesno(val & GPLLENABLE)); + DRM_DEBUG_DRIVER("GPU status: 0x%08x\n", val); + + return rps_reset(rps); +} + +static unsigned long __ips_gfx_val(struct intel_ips *ips) +{ + struct intel_rps *rps = container_of(ips, typeof(*rps), ips); + struct intel_uncore *uncore = rps_to_uncore(rps); + unsigned long t, corr, state1, corr2, state2; + u32 pxvid, ext_v; + + lockdep_assert_held(&mchdev_lock); + + pxvid = intel_uncore_read(uncore, PXVFREQ(rps->cur_freq)); + pxvid = (pxvid >> 24) & 0x7f; + ext_v = pvid_to_extvid(rps_to_i915(rps), pxvid); + + state1 = ext_v; + + /* Revel in the empirically derived constants */ + + /* Correction factor in 1/100000 units */ + t = ips_mch_val(uncore); + if (t > 80) + corr = t * 2349 + 135940; + else if (t >= 50) + corr = t * 964 + 29317; + else /* < 50 */ + corr = t * 301 + 1004; + + corr = corr * 150142 * state1 / 10000 - 78642; + corr /= 100000; + corr2 = corr * ips->corr; + + state2 = corr2 * state1 / 10000; + state2 /= 100; /* convert to mW */ + + __gen5_ips_update(ips); + + return ips->gfx_power + state2; +} + +void intel_rps_enable(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + struct intel_uncore *uncore = rps_to_uncore(rps); + + intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL); + if (IS_CHERRYVIEW(i915)) + rps->enabled = chv_rps_enable(rps); + else if (IS_VALLEYVIEW(i915)) + rps->enabled = vlv_rps_enable(rps); + else if (INTEL_GEN(i915) >= 9) + rps->enabled = gen9_rps_enable(rps); + else if (INTEL_GEN(i915) >= 8) + rps->enabled = gen8_rps_enable(rps); + else if (INTEL_GEN(i915) >= 6) + rps->enabled = gen6_rps_enable(rps); + else if (IS_IRONLAKE_M(i915)) + rps->enabled = gen5_rps_enable(rps); + intel_uncore_forcewake_put(uncore, FORCEWAKE_ALL); + if (!rps->enabled) + return; + + WARN_ON(rps->max_freq < rps->min_freq); + WARN_ON(rps->idle_freq > rps->max_freq); + + WARN_ON(rps->efficient_freq < rps->min_freq); + WARN_ON(rps->efficient_freq > rps->max_freq); +} + +static void gen6_rps_disable(struct intel_rps *rps) +{ + intel_uncore_write(rps_to_uncore(rps), GEN6_RP_CONTROL, 0); +} + +void intel_rps_disable(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + + rps->enabled = false; + + if (INTEL_GEN(i915) >= 6) + gen6_rps_disable(rps); + else if (IS_IRONLAKE_M(i915)) + gen5_rps_disable(rps); +} + +static int byt_gpu_freq(struct intel_rps *rps, int val) +{ + /* + * N = val - 0xb7 + * Slow = Fast = GPLL ref * N + */ + return DIV_ROUND_CLOSEST(rps->gpll_ref_freq * (val - 0xb7), 1000); +} + +static int byt_freq_opcode(struct intel_rps *rps, int val) +{ + return DIV_ROUND_CLOSEST(1000 * val, rps->gpll_ref_freq) + 0xb7; +} + +static int chv_gpu_freq(struct intel_rps *rps, int val) +{ + /* + * N = val / 2 + * CU (slow) = CU2x (fast) / 2 = GPLL ref * N / 2 + */ + return DIV_ROUND_CLOSEST(rps->gpll_ref_freq * val, 2 * 2 * 1000); +} + +static int chv_freq_opcode(struct intel_rps *rps, int val) +{ + /* CHV needs even values */ + return DIV_ROUND_CLOSEST(2 * 1000 * val, rps->gpll_ref_freq) * 2; +} + +int intel_gpu_freq(struct intel_rps *rps, int val) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + + if (INTEL_GEN(i915) >= 9) + return DIV_ROUND_CLOSEST(val * GT_FREQUENCY_MULTIPLIER, + GEN9_FREQ_SCALER); + else if (IS_CHERRYVIEW(i915)) + return chv_gpu_freq(rps, val); + else if (IS_VALLEYVIEW(i915)) + return byt_gpu_freq(rps, val); + else + return val * GT_FREQUENCY_MULTIPLIER; +} + +int intel_freq_opcode(struct intel_rps *rps, int val) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + + if (INTEL_GEN(i915) >= 9) + return DIV_ROUND_CLOSEST(val * GEN9_FREQ_SCALER, + GT_FREQUENCY_MULTIPLIER); + else if (IS_CHERRYVIEW(i915)) + return chv_freq_opcode(rps, val); + else if (IS_VALLEYVIEW(i915)) + return byt_freq_opcode(rps, val); + else + return DIV_ROUND_CLOSEST(val, GT_FREQUENCY_MULTIPLIER); +} + +static void vlv_init_gpll_ref_freq(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + + rps->gpll_ref_freq = + vlv_get_cck_clock(i915, "GPLL ref", + CCK_GPLL_CLOCK_CONTROL, + i915->czclk_freq); + + DRM_DEBUG_DRIVER("GPLL reference freq: %d kHz\n", rps->gpll_ref_freq); +} + +static void vlv_rps_init(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + u32 val; + + vlv_iosf_sb_get(i915, + BIT(VLV_IOSF_SB_PUNIT) | + BIT(VLV_IOSF_SB_NC) | + BIT(VLV_IOSF_SB_CCK)); + + vlv_init_gpll_ref_freq(rps); + + val = vlv_punit_read(i915, PUNIT_REG_GPU_FREQ_STS); + switch ((val >> 6) & 3) { + case 0: + case 1: + i915->mem_freq = 800; + break; + case 2: + i915->mem_freq = 1066; + break; + case 3: + i915->mem_freq = 1333; + break; + } + DRM_DEBUG_DRIVER("DDR speed: %d MHz\n", i915->mem_freq); + + rps->max_freq = vlv_rps_max_freq(rps); + rps->rp0_freq = rps->max_freq; + DRM_DEBUG_DRIVER("max GPU freq: %d MHz (%u)\n", + intel_gpu_freq(rps, rps->max_freq), + rps->max_freq); + + rps->efficient_freq = vlv_rps_rpe_freq(rps); + DRM_DEBUG_DRIVER("RPe GPU freq: %d MHz (%u)\n", + intel_gpu_freq(rps, rps->efficient_freq), + rps->efficient_freq); + + rps->rp1_freq = vlv_rps_guar_freq(rps); + DRM_DEBUG_DRIVER("RP1(Guar Freq) GPU freq: %d MHz (%u)\n", + intel_gpu_freq(rps, rps->rp1_freq), + rps->rp1_freq); + + rps->min_freq = vlv_rps_min_freq(rps); + DRM_DEBUG_DRIVER("min GPU freq: %d MHz (%u)\n", + intel_gpu_freq(rps, rps->min_freq), + rps->min_freq); + + vlv_iosf_sb_put(i915, + BIT(VLV_IOSF_SB_PUNIT) | + BIT(VLV_IOSF_SB_NC) | + BIT(VLV_IOSF_SB_CCK)); +} + +static void chv_rps_init(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + u32 val; + + vlv_iosf_sb_get(i915, + BIT(VLV_IOSF_SB_PUNIT) | + BIT(VLV_IOSF_SB_NC) | + BIT(VLV_IOSF_SB_CCK)); + + vlv_init_gpll_ref_freq(rps); + + val = vlv_cck_read(i915, CCK_FUSE_REG); + + switch ((val >> 2) & 0x7) { + case 3: + i915->mem_freq = 2000; + break; + default: + i915->mem_freq = 1600; + break; + } + DRM_DEBUG_DRIVER("DDR speed: %d MHz\n", i915->mem_freq); + + rps->max_freq = chv_rps_max_freq(rps); + rps->rp0_freq = rps->max_freq; + DRM_DEBUG_DRIVER("max GPU freq: %d MHz (%u)\n", + intel_gpu_freq(rps, rps->max_freq), + rps->max_freq); + + rps->efficient_freq = chv_rps_rpe_freq(rps); + DRM_DEBUG_DRIVER("RPe GPU freq: %d MHz (%u)\n", + intel_gpu_freq(rps, rps->efficient_freq), + rps->efficient_freq); + + rps->rp1_freq = chv_rps_guar_freq(rps); + DRM_DEBUG_DRIVER("RP1(Guar) GPU freq: %d MHz (%u)\n", + intel_gpu_freq(rps, rps->rp1_freq), + rps->rp1_freq); + + rps->min_freq = chv_rps_min_freq(rps); + DRM_DEBUG_DRIVER("min GPU freq: %d MHz (%u)\n", + intel_gpu_freq(rps, rps->min_freq), + rps->min_freq); + + vlv_iosf_sb_put(i915, + BIT(VLV_IOSF_SB_PUNIT) | + BIT(VLV_IOSF_SB_NC) | + BIT(VLV_IOSF_SB_CCK)); + + WARN_ONCE((rps->max_freq | rps->efficient_freq | rps->rp1_freq | + rps->min_freq) & 1, + "Odd GPU freq values\n"); +} + +static void vlv_c0_read(struct intel_uncore *uncore, struct intel_rps_ei *ei) +{ + ei->ktime = ktime_get_raw(); + ei->render_c0 = intel_uncore_read(uncore, VLV_RENDER_C0_COUNT); + ei->media_c0 = intel_uncore_read(uncore, VLV_MEDIA_C0_COUNT); +} + +static u32 vlv_wa_c0_ei(struct intel_rps *rps, u32 pm_iir) +{ + struct intel_uncore *uncore = rps_to_uncore(rps); + const struct intel_rps_ei *prev = &rps->ei; + struct intel_rps_ei now; + u32 events = 0; + + if ((pm_iir & GEN6_PM_RP_UP_EI_EXPIRED) == 0) + return 0; + + vlv_c0_read(uncore, &now); + + if (prev->ktime) { + u64 time, c0; + u32 render, media; + + time = ktime_us_delta(now.ktime, prev->ktime); + + time *= rps_to_i915(rps)->czclk_freq; + + /* Workload can be split between render + media, + * e.g. SwapBuffers being blitted in X after being rendered in + * mesa. To account for this we need to combine both engines + * into our activity counter. + */ + render = now.render_c0 - prev->render_c0; + media = now.media_c0 - prev->media_c0; + c0 = max(render, media); + c0 *= 1000 * 100 << 8; /* to usecs and scale to threshold% */ + + if (c0 > time * rps->power.up_threshold) + events = GEN6_PM_RP_UP_THRESHOLD; + else if (c0 < time * rps->power.down_threshold) + events = GEN6_PM_RP_DOWN_THRESHOLD; + } + + rps->ei = now; + return events; +} + +static void rps_work(struct work_struct *work) +{ + struct intel_rps *rps = container_of(work, typeof(*rps), work); + struct intel_gt *gt = rps_to_gt(rps); + bool client_boost = false; + int new_freq, adj, min, max; + u32 pm_iir = 0; + + spin_lock_irq(>->irq_lock); + pm_iir = fetch_and_zero(&rps->pm_iir); + client_boost = atomic_read(&rps->num_waiters); + spin_unlock_irq(>->irq_lock); + + /* Make sure we didn't queue anything we're not going to process. */ + if ((pm_iir & rps->pm_events) == 0 && !client_boost) + goto out; + + mutex_lock(&rps->lock); + + pm_iir |= vlv_wa_c0_ei(rps, pm_iir); + + adj = rps->last_adj; + new_freq = rps->cur_freq; + min = rps->min_freq_softlimit; + max = rps->max_freq_softlimit; + if (client_boost) + max = rps->max_freq; + if (client_boost && new_freq < rps->boost_freq) { + new_freq = rps->boost_freq; + adj = 0; + } else if (pm_iir & GEN6_PM_RP_UP_THRESHOLD) { + if (adj > 0) + adj *= 2; + else /* CHV needs even encode values */ + adj = IS_CHERRYVIEW(gt->i915) ? 2 : 1; + + if (new_freq >= rps->max_freq_softlimit) + adj = 0; + } else if (client_boost) { + adj = 0; + } else if (pm_iir & GEN6_PM_RP_DOWN_TIMEOUT) { + if (rps->cur_freq > rps->efficient_freq) + new_freq = rps->efficient_freq; + else if (rps->cur_freq > rps->min_freq_softlimit) + new_freq = rps->min_freq_softlimit; + adj = 0; + } else if (pm_iir & GEN6_PM_RP_DOWN_THRESHOLD) { + if (adj < 0) + adj *= 2; + else /* CHV needs even encode values */ + adj = IS_CHERRYVIEW(gt->i915) ? -2 : -1; + + if (new_freq <= rps->min_freq_softlimit) + adj = 0; + } else { /* unknown event */ + adj = 0; + } + + rps->last_adj = adj; + + /* + * Limit deboosting and boosting to keep ourselves at the extremes + * when in the respective power modes (i.e. slowly decrease frequencies + * while in the HIGH_POWER zone and slowly increase frequencies while + * in the LOW_POWER zone). On idle, we will hit the timeout and drop + * to the next level quickly, and conversely if busy we expect to + * hit a waitboost and rapidly switch into max power. + */ + if ((adj < 0 && rps->power.mode == HIGH_POWER) || + (adj > 0 && rps->power.mode == LOW_POWER)) + rps->last_adj = 0; + + /* sysfs frequency interfaces may have snuck in while servicing the + * interrupt + */ + new_freq += adj; + new_freq = clamp_t(int, new_freq, min, max); + + if (intel_rps_set(rps, new_freq)) { + DRM_DEBUG_DRIVER("Failed to set new GPU frequency\n"); + rps->last_adj = 0; + } + + mutex_unlock(&rps->lock); + +out: + spin_lock_irq(>->irq_lock); + gen6_gt_pm_unmask_irq(gt, rps->pm_events); + spin_unlock_irq(>->irq_lock); +} + +void gen11_rps_irq_handler(struct intel_rps *rps, u32 pm_iir) +{ + struct intel_gt *gt = rps_to_gt(rps); + const u32 events = rps->pm_events & pm_iir; + + lockdep_assert_held(>->irq_lock); + + if (unlikely(!events)) + return; + + gen6_gt_pm_mask_irq(gt, events); + + rps->pm_iir |= events; + schedule_work(&rps->work); +} + +void gen6_rps_irq_handler(struct intel_rps *rps, u32 pm_iir) +{ + struct intel_gt *gt = rps_to_gt(rps); + + if (pm_iir & rps->pm_events) { + spin_lock(>->irq_lock); + gen6_gt_pm_mask_irq(gt, pm_iir & rps->pm_events); + rps->pm_iir |= pm_iir & rps->pm_events; + schedule_work(&rps->work); + spin_unlock(>->irq_lock); + } + + if (INTEL_GEN(gt->i915) >= 8) + return; + + if (pm_iir & PM_VEBOX_USER_INTERRUPT) + intel_engine_breadcrumbs_irq(gt->engine[VECS0]); + + if (pm_iir & PM_VEBOX_CS_ERROR_INTERRUPT) + DRM_DEBUG("Command parser error, pm_iir 0x%08x\n", pm_iir); +} + +void gen5_rps_irq_handler(struct intel_rps *rps) +{ + struct intel_uncore *uncore = rps_to_uncore(rps); + u32 busy_up, busy_down, max_avg, min_avg; + u8 new_freq; + + spin_lock(&mchdev_lock); + + intel_uncore_write16(uncore, + MEMINTRSTS, + intel_uncore_read(uncore, MEMINTRSTS)); + + intel_uncore_write16(uncore, MEMINTRSTS, MEMINT_EVAL_CHG); + busy_up = intel_uncore_read(uncore, RCPREVBSYTUPAVG); + busy_down = intel_uncore_read(uncore, RCPREVBSYTDNAVG); + max_avg = intel_uncore_read(uncore, RCBMAXAVG); + min_avg = intel_uncore_read(uncore, RCBMINAVG); + + /* Handle RCS change request from hw */ + new_freq = rps->cur_freq; + if (busy_up > max_avg) + new_freq++; + else if (busy_down < min_avg) + new_freq--; + new_freq = clamp(new_freq, + rps->min_freq_softlimit, + rps->max_freq_softlimit); + + if (new_freq != rps->cur_freq && gen5_rps_set(rps, new_freq)) + rps->cur_freq = new_freq; + + spin_unlock(&mchdev_lock); +} + +void intel_rps_init_early(struct intel_rps *rps) +{ + mutex_init(&rps->lock); + mutex_init(&rps->power.mutex); + + INIT_WORK(&rps->work, rps_work); + + atomic_set(&rps->num_waiters, 0); +} + +void intel_rps_init(struct intel_rps *rps) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + + if (IS_CHERRYVIEW(i915)) + chv_rps_init(rps); + else if (IS_VALLEYVIEW(i915)) + vlv_rps_init(rps); + else if (INTEL_GEN(i915) >= 6) + gen6_rps_init(rps); + else if (IS_IRONLAKE_M(i915)) + gen5_rps_init(rps); + + /* Derive initial user preferences/limits from the hardware limits */ + rps->max_freq_softlimit = rps->max_freq; + rps->min_freq_softlimit = rps->min_freq; + + /* After setting max-softlimit, find the overclock max freq */ + if (IS_GEN(i915, 6) || IS_IVYBRIDGE(i915) || IS_HASWELL(i915)) { + u32 params = 0; + + sandybridge_pcode_read(i915, GEN6_READ_OC_PARAMS, + ¶ms, NULL); + if (params & BIT(31)) { /* OC supported */ + DRM_DEBUG_DRIVER("Overclocking supported, max: %dMHz, overclock: %dMHz\n", + (rps->max_freq & 0xff) * 50, + (params & 0xff) * 50); + rps->max_freq = params & 0xff; + } + } + + /* Finally allow us to boost to max by default */ + rps->boost_freq = rps->max_freq; + rps->idle_freq = rps->min_freq; + rps->cur_freq = rps->idle_freq; + + rps->pm_intrmsk_mbz = 0; + + /* + * SNB,IVB,HSW can while VLV,CHV may hard hang on looping batchbuffer + * if GEN6_PM_UP_EI_EXPIRED is masked. + * + * TODO: verify if this can be reproduced on VLV,CHV. + */ + if (INTEL_GEN(i915) <= 7) + rps->pm_intrmsk_mbz |= GEN6_PM_RP_UP_EI_EXPIRED; + + if (INTEL_GEN(i915) >= 8) + rps->pm_intrmsk_mbz |= GEN8_PMINTR_DISABLE_REDIRECT_TO_GUC; +} + +u32 intel_get_cagf(struct intel_rps *rps, u32 rpstat) +{ + struct drm_i915_private *i915 = rps_to_i915(rps); + u32 cagf; + + if (INTEL_GEN(i915) >= 9) + cagf = (rpstat & GEN9_CAGF_MASK) >> GEN9_CAGF_SHIFT; + else if (IS_HASWELL(i915) || IS_BROADWELL(i915)) + cagf = (rpstat & HSW_CAGF_MASK) >> HSW_CAGF_SHIFT; + else + cagf = (rpstat & GEN6_CAGF_MASK) >> GEN6_CAGF_SHIFT; + + return cagf; +} + +/* External interface for intel_ips.ko */ + +static struct drm_i915_private __rcu *ips_mchdev; + +/** + * Tells the intel_ips driver that the i915 driver is now loaded, if + * IPS got loaded first. + * + * This awkward dance is so that neither module has to depend on the + * other in order for IPS to do the appropriate communication of + * GPU turbo limits to i915. + */ +static void +ips_ping_for_i915_load(void) +{ + void (*link)(void); + + link = symbol_get(ips_link_to_i915_driver); + if (link) { + link(); + symbol_put(ips_link_to_i915_driver); + } +} + +void intel_rps_driver_register(struct intel_rps *rps) +{ + struct intel_gt *gt = rps_to_gt(rps); + + /* + * We only register the i915 ips part with intel-ips once everything is + * set up, to avoid intel-ips sneaking in and reading bogus values. + */ + if (IS_GEN(gt->i915, 5)) { + rcu_assign_pointer(ips_mchdev, gt->i915); + ips_ping_for_i915_load(); + } +} + +void intel_rps_driver_unregister(struct intel_rps *rps) +{ + rcu_assign_pointer(ips_mchdev, NULL); +} + +static struct drm_i915_private *mchdev_get(void) +{ + struct drm_i915_private *i915; + + rcu_read_lock(); + i915 = rcu_dereference(ips_mchdev); + if (!kref_get_unless_zero(&i915->drm.ref)) + i915 = NULL; + rcu_read_unlock(); + + return i915; +} + +/** + * i915_read_mch_val - return value for IPS use + * + * Calculate and return a value for the IPS driver to use when deciding whether + * we have thermal and power headroom to increase CPU or GPU power budget. + */ +unsigned long i915_read_mch_val(void) +{ + struct drm_i915_private *i915; + unsigned long chipset_val = 0; + unsigned long graphics_val = 0; + intel_wakeref_t wakeref; + + i915 = mchdev_get(); + if (!i915) + return 0; + + with_intel_runtime_pm(&i915->runtime_pm, wakeref) { + struct intel_ips *ips = &i915->gt.rps.ips; + + spin_lock_irq(&mchdev_lock); + chipset_val = __ips_chipset_val(ips); + graphics_val = __ips_gfx_val(ips); + spin_unlock_irq(&mchdev_lock); + } + + drm_dev_put(&i915->drm); + return chipset_val + graphics_val; +} +EXPORT_SYMBOL_GPL(i915_read_mch_val); + +/** + * i915_gpu_raise - raise GPU frequency limit + * + * Raise the limit; IPS indicates we have thermal headroom. + */ +bool i915_gpu_raise(void) +{ + struct drm_i915_private *i915; + struct intel_rps *rps; + + i915 = mchdev_get(); + if (!i915) + return false; + + rps = &i915->gt.rps; + + spin_lock_irq(&mchdev_lock); + if (rps->max_freq_softlimit < rps->max_freq) + rps->max_freq_softlimit++; + spin_unlock_irq(&mchdev_lock); + + drm_dev_put(&i915->drm); + return true; +} +EXPORT_SYMBOL_GPL(i915_gpu_raise); + +/** + * i915_gpu_lower - lower GPU frequency limit + * + * IPS indicates we're close to a thermal limit, so throttle back the GPU + * frequency maximum. + */ +bool i915_gpu_lower(void) +{ + struct drm_i915_private *i915; + struct intel_rps *rps; + + i915 = mchdev_get(); + if (!i915) + return false; + + rps = &i915->gt.rps; + + spin_lock_irq(&mchdev_lock); + if (rps->max_freq_softlimit > rps->min_freq) + rps->max_freq_softlimit--; + spin_unlock_irq(&mchdev_lock); + + drm_dev_put(&i915->drm); + return true; +} +EXPORT_SYMBOL_GPL(i915_gpu_lower); + +/** + * i915_gpu_busy - indicate GPU business to IPS + * + * Tell the IPS driver whether or not the GPU is busy. + */ +bool i915_gpu_busy(void) +{ + struct drm_i915_private *i915; + bool ret; + + i915 = mchdev_get(); + if (!i915) + return false; + + ret = i915->gt.awake; + + drm_dev_put(&i915->drm); + return ret; +} +EXPORT_SYMBOL_GPL(i915_gpu_busy); + +/** + * i915_gpu_turbo_disable - disable graphics turbo + * + * Disable graphics turbo by resetting the max frequency and setting the + * current frequency to the default. + */ +bool i915_gpu_turbo_disable(void) +{ + struct drm_i915_private *i915; + struct intel_rps *rps; + bool ret; + + i915 = mchdev_get(); + if (!i915) + return false; + + rps = &i915->gt.rps; + + spin_lock_irq(&mchdev_lock); + rps->max_freq_softlimit = rps->min_freq; + ret = gen5_rps_set(&i915->gt.rps, rps->min_freq); + spin_unlock_irq(&mchdev_lock); + + drm_dev_put(&i915->drm); + return ret; +} +EXPORT_SYMBOL_GPL(i915_gpu_turbo_disable); |