// SPDX-License-Identifier: MIT
/*
 * Copyright © 2019 Intel Corporation
 */

#include <drm/i915_drm.h>

#include "i915_drv.h"
#include "intel_breadcrumbs.h"
#include "intel_gt.h"
#include "intel_gt_clock_utils.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"

#define BUSY_MAX_EI     20u /* ms */

/*
 * 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 struct intel_guc_slpc *rps_to_slpc(struct intel_rps *rps)
{
        struct intel_gt *gt = rps_to_gt(rps);

        return &gt->uc.guc.slpc;
}

static bool rps_uses_slpc(struct intel_rps *rps)
{
        struct intel_gt *gt = rps_to_gt(rps);

        return intel_uc_uses_guc_slpc(&gt->uc);
}

static u32 rps_pm_sanitize_mask(struct intel_rps *rps, u32 mask)
{
        return mask & ~rps->pm_intrmsk_mbz;
}

static void set(struct intel_uncore *uncore, i915_reg_t reg, u32 val)
{
        intel_uncore_write_fw(uncore, reg, val);
}

static void rps_timer(struct timer_list *t)
{
        struct intel_rps *rps = from_timer(rps, t, timer);
        struct intel_engine_cs *engine;
        ktime_t dt, last, timestamp;
        enum intel_engine_id id;
        s64 max_busy[3] = {};

        timestamp = 0;
        for_each_engine(engine, rps_to_gt(rps), id) {
                s64 busy;
                int i;

                dt = intel_engine_get_busy_time(engine, &timestamp);
                last = engine->stats.rps;
                engine->stats.rps = dt;

                busy = ktime_to_ns(ktime_sub(dt, last));
                for (i = 0; i < ARRAY_SIZE(max_busy); i++) {
                        if (busy > max_busy[i])
                                swap(busy, max_busy[i]);
                }
        }
        last = rps->pm_timestamp;
        rps->pm_timestamp = timestamp;

        if (intel_rps_is_active(rps)) {
                s64 busy;
                int i;

                dt = ktime_sub(timestamp, last);

                /*
                 * Our goal is to evaluate each engine independently, so we run
                 * at the lowest clocks required to sustain the heaviest
                 * workload. However, a task may be split into sequential
                 * dependent operations across a set of engines, such that
                 * the independent contributions do not account for high load,
                 * but overall the task is GPU bound. For example, consider
                 * video decode on vcs followed by colour post-processing
                 * on vecs, followed by general post-processing on rcs.
                 * Since multi-engines being active does imply a single
                 * continuous workload across all engines, we hedge our
                 * bets by only contributing a factor of the distributed
                 * load into our busyness calculation.
                 */
                busy = max_busy[0];
                for (i = 1; i < ARRAY_SIZE(max_busy); i++) {
                        if (!max_busy[i])
                                break;

                        busy += div_u64(max_busy[i], 1 << i);
                }
                GT_TRACE(rps_to_gt(rps),
                         "busy:%lld [%d%%], max:[%lld, %lld, %lld], interval:%d\n",
                         busy, (int)div64_u64(100 * busy, dt),
                         max_busy[0], max_busy[1], max_busy[2],
                         rps->pm_interval);

                if (100 * busy > rps->power.up_threshold * dt &&
                    rps->cur_freq < rps->max_freq_softlimit) {
                        rps->pm_iir |= GEN6_PM_RP_UP_THRESHOLD;
                        rps->pm_interval = 1;
                        schedule_work(&rps->work);
                } else if (100 * busy < rps->power.down_threshold * dt &&
                           rps->cur_freq > rps->min_freq_softlimit) {
                        rps->pm_iir |= GEN6_PM_RP_DOWN_THRESHOLD;
                        rps->pm_interval = 1;
                        schedule_work(&rps->work);
                } else {
                        rps->last_adj = 0;
                }

                mod_timer(&rps->timer,
                          jiffies + msecs_to_jiffies(rps->pm_interval));
                rps->pm_interval = min(rps->pm_interval * 2, BUSY_MAX_EI);
        }
}

static void rps_start_timer(struct intel_rps *rps)
{
        rps->pm_timestamp = ktime_sub(ktime_get(), rps->pm_timestamp);
        rps->pm_interval = 1;
        mod_timer(&rps->timer, jiffies + 1);
}

static void rps_stop_timer(struct intel_rps *rps)
{
        del_timer_sync(&rps->timer);
        rps->pm_timestamp = ktime_sub(ktime_get(), rps->pm_timestamp);
        cancel_work_sync(&rps->work);
}

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);

        GEM_BUG_ON(rps_uses_slpc(rps));

        GT_TRACE(gt, "interrupts:on rps->pm_events: %x, rps_pm_mask:%x\n",
                 rps->pm_events, rps_pm_mask(rps, rps->last_freq));

        rps_reset_ei(rps);

        spin_lock_irq(&gt->irq_lock);
        gen6_gt_pm_enable_irq(gt, rps->pm_events);
        spin_unlock_irq(&gt->irq_lock);

        intel_uncore_write(gt->uncore,
                           GEN6_PMINTRMSK, rps_pm_mask(rps, rps->last_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(&gt->irq_lock);
        if (GRAPHICS_VER(gt->i915) >= 11)
                gen11_rps_reset_interrupts(rps);
        else
                gen6_rps_reset_interrupts(rps);

        rps->pm_iir = 0;
        spin_unlock_irq(&gt->irq_lock);
}

static void rps_disable_interrupts(struct intel_rps *rps)
{
        struct intel_gt *gt = rps_to_gt(rps);

        intel_uncore_write(gt->uncore,
                           GEN6_PMINTRMSK, rps_pm_sanitize_mask(rps, ~0u));

        spin_lock_irq(&gt->irq_lock);
        gen6_gt_pm_disable_irq(gt, GEN6_PM_RPS_EVENTS);
        spin_unlock_irq(&gt->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);
        GT_TRACE(gt, "interrupts:off\n");
}

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_dbg(&i915->drm, "fmax: %d, fmin: %d, fstart: %d\n",
                fmax, fmin, fstart);

        rps->min_freq = fmax;
        rps->efficient_freq = fstart;
        rps->max_freq = fmin;
}

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 unsigned int gen5_invert_freq(struct intel_rps *rps,
                                     unsigned int val)
{
        /* Invert the frequency bin into an ips delay */
        val = rps->max_freq - val;
        val = rps->min_freq + val;

        return val;
}

static int __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 -EBUSY; /* still busy with another command */
        }

        /* Invert the frequency bin into an ips delay */
        val = gen5_invert_freq(rps, 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 0;
}

static int gen5_rps_set(struct intel_rps *rps, u8 val)
{
        int err;

        spin_lock_irq(&mchdev_lock);
        err = __gen5_rps_set(rps, val);
        spin_unlock_irq(&mchdev_lock);

        return err;
}

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 drm_i915_private *i915 = rps_to_i915(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_err(&uncore->i915->drm,
                        "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_lock(&i915->irq_lock);
        ilk_enable_display_irq(i915, DE_PCU_EVENT);
        spin_unlock(&i915->irq_lock);

        spin_unlock_irq(&mchdev_lock);

        rps->ips.corr = init_emon(uncore);

        return true;
}

static void gen5_rps_disable(struct intel_rps *rps)
{
        struct drm_i915_private *i915 = rps_to_i915(rps);
        struct intel_uncore *uncore = rps_to_uncore(rps);
        u16 rgvswctl;

        spin_lock_irq(&mchdev_lock);

        spin_lock(&i915->irq_lock);
        ilk_disable_display_irq(i915, DE_PCU_EVENT);
        spin_unlock(&i915->irq_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);

        /* 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 (GRAPHICS_VER(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_gt *gt = rps_to_gt(rps);
        struct intel_uncore *uncore = gt->uncore;
        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;

        threshold_up = 95;
        threshold_down = 85;

        /* Note the units here are not exactly 1us, but 1280ns. */
        switch (new_power) {
        case LOW_POWER:
                ei_up = 16000;
                ei_down = 32000;
                break;

        case BETWEEN:
                ei_up = 13000;
                ei_down = 32000;
                break;

        case HIGH_POWER:
                ei_up = 10000;
                ei_down = 32000;
                break;
        }

        /* When byt can survive without system hang with dynamic
         * sw freq adjustments, this restriction can be lifted.
         */
        if (IS_VALLEYVIEW(gt->i915))
                goto skip_hw_write;

        GT_TRACE(gt,
                 "changing power mode [%d], up %d%% @ %dus, down %d%% @ %dus\n",
                 new_power, threshold_up, ei_up, threshold_down, ei_down);

        set(uncore, GEN6_RP_UP_EI,
            intel_gt_ns_to_pm_interval(gt, ei_up * 1000));
        set(uncore, GEN6_RP_UP_THRESHOLD,
            intel_gt_ns_to_pm_interval(gt, ei_up * threshold_up * 10));

        set(uncore, GEN6_RP_DOWN_EI,
            intel_gt_ns_to_pm_interval(gt, ei_down * 1000));
        set(uncore, GEN6_RP_DOWN_THRESHOLD,
            intel_gt_ns_to_pm_interval(gt, ei_down * threshold_down * 10));

        set(uncore, GEN6_RP_CONTROL,
            (GRAPHICS_VER(gt->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)
{
        GT_TRACE(rps_to_gt(rps), "mark interactive: %s\n", yesno(interactive));

        mutex_lock(&rps->power.mutex);
        if (interactive) {
                if (!rps->power.interactive++ && intel_rps_is_active(rps))
                        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;

        GEM_BUG_ON(rps_uses_slpc(rps));

        if (GRAPHICS_VER(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);
        set(uncore, GEN6_RPNSWREQ, swreq);

        GT_TRACE(rps_to_gt(rps), "set val:%x, freq:%d, swreq:%x\n",
                 val, intel_gpu_freq(rps, val), 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);

        GT_TRACE(rps_to_gt(rps), "set val:%x, freq:%d\n",
                 val, intel_gpu_freq(rps, val));

        return err;
}

static int rps_set(struct intel_rps *rps, u8 val, bool update)
{
        struct drm_i915_private *i915 = rps_to_i915(rps);
        int err;

        if (val == rps->last_freq)
                return 0;

        if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915))
                err = vlv_rps_set(rps, val);
        else if (GRAPHICS_VER(i915) >= 6)
                err = gen6_rps_set(rps, val);
        else
                err = gen5_rps_set(rps, val);
        if (err)
                return err;

        if (update && GRAPHICS_VER(i915) >= 6)
                gen6_rps_set_thresholds(rps, val);
        rps->last_freq = val;

        return 0;
}

void intel_rps_unpark(struct intel_rps *rps)
{
        if (!intel_rps_is_enabled(rps))
                return;

        GT_TRACE(rps_to_gt(rps), "unpark:%x\n", rps->cur_freq);

        /*
         * 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);

        intel_rps_set_active(rps);
        intel_rps_set(rps,
                      clamp(rps->cur_freq,
                            rps->min_freq_softlimit,
                            rps->max_freq_softlimit));

        mutex_unlock(&rps->lock);

        rps->pm_iir = 0;
        if (intel_rps_has_interrupts(rps))
                rps_enable_interrupts(rps);
        if (intel_rps_uses_timer(rps))
                rps_start_timer(rps);

        if (GRAPHICS_VER(rps_to_i915(rps)) == 5)
                gen5_rps_update(rps);
}

void intel_rps_park(struct intel_rps *rps)
{
        int adj;

        if (!intel_rps_is_enabled(rps))
                return;

        if (!intel_rps_clear_active(rps))
                return;

        if (intel_rps_uses_timer(rps))
                rps_stop_timer(rps);
        if (intel_rps_has_interrupts(rps))
                rps_disable_interrupts(rps);

        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, false);
        intel_uncore_forcewake_put(rps_to_uncore(rps), FORCEWAKE_MEDIA);

        /*
         * Since we will try and restart from the previously requested
         * frequency on unparking, treat this idle point as a downclock
         * interrupt and reduce the frequency for resume. If we park/unpark
         * more frequently than the rps worker can run, we will not respond
         * to any EI and never see a change in frequency.
         *
         * (Note we accommodate Cherryview's limitation of only using an
         * even bin by applying it to all.)
         */
        adj = rps->last_adj;
        if (adj < 0)
                adj *= 2;
        else /* CHV needs even encode values */
                adj = -2;
        rps->last_adj = adj;
        rps->cur_freq = max_t(int, rps->cur_freq + adj, rps->min_freq);
        if (rps->cur_freq < rps->efficient_freq) {
                rps->cur_freq = rps->efficient_freq;
                rps->last_adj = 0;
        }

        GT_TRACE(rps_to_gt(rps), "park:%x\n", rps->cur_freq);
}

void intel_rps_boost(struct i915_request *rq)
{
        if (i915_request_signaled(rq) || i915_request_has_waitboost(rq))
                return;

        /* Serializes with i915_request_retire() */
        if (!test_and_set_bit(I915_FENCE_FLAG_BOOST, &rq->fence.flags)) {
                struct intel_rps *rps = &READ_ONCE(rq->engine)->gt->rps;

                if (atomic_fetch_inc(&rps->num_waiters))
                        return;

                if (!intel_rps_is_active(rps))
                        return;

                GT_TRACE(rps_to_gt(rps), "boost fence:%llx:%llx\n",
                         rq->fence.context, rq->fence.seqno);

                if (READ_ONCE(rps->cur_freq) < rps->boost_freq)
                        schedule_work(&rps->work);

                WRITE_ONCE(rps->boosts, rps->boosts + 1); /* debug only */
        }
}

int intel_rps_set(struct intel_rps *rps, u8 val)
{
        int err;

        lockdep_assert_held(&rps->lock);
        GEM_BUG_ON(val > rps->max_freq);
        GEM_BUG_ON(val < rps->min_freq);

        if (intel_rps_is_active(rps)) {
                err = rps_set(rps, val, true);
                if (err)
                        return err;

                /*
                 * Make sure we continue to get interrupts
                 * until we hit the minimum or maximum frequencies.
                 */
                if (intel_rps_has_interrupts(rps)) {
                        struct intel_uncore *uncore = rps_to_uncore(rps);

                        set(uncore,
                            GEN6_RP_INTERRUPT_LIMITS, rps_limits(rps, val));

                        set(uncore, GEN6_PMINTRMSK, rps_pm_mask(rps, val));
                }
        }

        rps->cur_freq = val;
        return 0;
}

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) || GRAPHICS_VER(i915) >= 11) {
                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) || GRAPHICS_VER(i915) >= 11) {
                /* 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)
{
        struct drm_i915_private *i915 = rps_to_i915(rps);

        /* force a reset */
        rps->power.mode = -1;
        rps->last_freq = -1;

        if (rps_set(rps, rps->min_freq, true)) {
                drm_err(&i915->drm, "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 intel_gt *gt = rps_to_gt(rps);
        struct intel_uncore *uncore = gt->uncore;

        /* Program defaults and thresholds for RPS */
        if (GRAPHICS_VER(gt->i915) == 9)
                intel_uncore_write_fw(uncore, GEN6_RC_VIDEO_FREQ,
                                      GEN9_FREQUENCY(rps->rp1_freq));

        intel_uncore_write_fw(uncore, GEN6_RP_IDLE_HYSTERSIS, 0xa);

        rps->pm_events = GEN6_PM_RP_UP_THRESHOLD | GEN6_PM_RP_DOWN_THRESHOLD;

        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));

        intel_uncore_write_fw(uncore, GEN6_RP_IDLE_HYSTERSIS, 10);

        rps->pm_events = GEN6_PM_RP_UP_THRESHOLD | GEN6_PM_RP_DOWN_THRESHOLD;

        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);

        rps->pm_events = (GEN6_PM_RP_UP_THRESHOLD |
                          GEN6_PM_RP_DOWN_THRESHOLD |
                          GEN6_PM_RP_DOWN_TIMEOUT);

        return rps_reset(rps);
}

static int chv_rps_max_freq(struct intel_rps *rps)
{
        struct drm_i915_private *i915 = rps_to_i915(rps);
        struct intel_gt *gt = rps_to_gt(rps);
        u32 val;

        val = vlv_punit_read(i915, FB_GFX_FMAX_AT_VMAX_FUSE);

        switch (gt->info.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);

        rps->pm_events = (GEN6_PM_RP_UP_THRESHOLD |
                          GEN6_PM_RP_DOWN_THRESHOLD |
                          GEN6_PM_RP_DOWN_TIMEOUT);

        /* 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 */
        drm_WARN_ONCE(&i915->drm, (val & GPLLENABLE) == 0,
                      "GPLL not enabled\n");

        drm_dbg(&i915->drm, "GPLL enabled? %s\n", yesno(val & GPLLENABLE));
        drm_dbg(&i915->drm, "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);

        /* WaGsvRC0ResidencyMethod:vlv */
        rps->pm_events = GEN6_PM_RP_UP_EI_EXPIRED;

        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 */
        drm_WARN_ONCE(&i915->drm, (val & GPLLENABLE) == 0,
                      "GPLL not enabled\n");

        drm_dbg(&i915->drm, "GPLL enabled? %s\n", yesno(val & GPLLENABLE));
        drm_dbg(&i915->drm, "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 int t, state1, state2;
        u32 pxvid, ext_v;
        u64 corr, corr2;

        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 = div_u64(corr * 150142 * state1, 10000) - 78642;
        corr2 = div_u64(corr, 100000) * ips->corr;

        state2 = div_u64(corr2 * state1, 10000);
        state2 /= 100; /* convert to mW */

        __gen5_ips_update(ips);

        return ips->gfx_power + state2;
}

static bool has_busy_stats(struct intel_rps *rps)
{
        struct intel_engine_cs *engine;
        enum intel_engine_id id;

        for_each_engine(engine, rps_to_gt(rps), id) {
                if (!intel_engine_supports_stats(engine))
                        return false;
        }

        return true;
}

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);
        bool enabled = false;

        if (!HAS_RPS(i915))
                return;

        if (rps_uses_slpc(rps))
                return;

        intel_gt_check_clock_frequency(rps_to_gt(rps));

        intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL);
        if (rps->max_freq <= rps->min_freq)
                /* leave disabled, no room for dynamic reclocking */;
        else if (IS_CHERRYVIEW(i915))
                enabled = chv_rps_enable(rps);
        else if (IS_VALLEYVIEW(i915))
                enabled = vlv_rps_enable(rps);
        else if (GRAPHICS_VER(i915) >= 9)
                enabled = gen9_rps_enable(rps);
        else if (GRAPHICS_VER(i915) >= 8)
                enabled = gen8_rps_enable(rps);
        else if (GRAPHICS_VER(i915) >= 6)
                enabled = gen6_rps_enable(rps);
        else if (IS_IRONLAKE_M(i915))
                enabled = gen5_rps_enable(rps);
        else
                MISSING_CASE(GRAPHICS_VER(i915));
        intel_uncore_forcewake_put(uncore, FORCEWAKE_ALL);
        if (!enabled)
                return;

        GT_TRACE(rps_to_gt(rps),
                 "min:%x, max:%x, freq:[%d, %d]\n",
                 rps->min_freq, rps->max_freq,
                 intel_gpu_freq(rps, rps->min_freq),
                 intel_gpu_freq(rps, rps->max_freq));

        GEM_BUG_ON(rps->max_freq < rps->min_freq);
        GEM_BUG_ON(rps->idle_freq > rps->max_freq);

        GEM_BUG_ON(rps->efficient_freq < rps->min_freq);
        GEM_BUG_ON(rps->efficient_freq > rps->max_freq);

        if (has_busy_stats(rps))
                intel_rps_set_timer(rps);
        else if (GRAPHICS_VER(i915) >= 6)
                intel_rps_set_interrupts(rps);
        else
                /* Ironlake currently uses intel_ips.ko */ {}

        intel_rps_set_enabled(rps);
}

static void gen6_rps_disable(struct intel_rps *rps)
{
        set(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);

        intel_rps_clear_enabled(rps);
        intel_rps_clear_interrupts(rps);
        intel_rps_clear_timer(rps);

        if (GRAPHICS_VER(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 (GRAPHICS_VER(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 if (GRAPHICS_VER(i915) >= 6)
                return val * GT_FREQUENCY_MULTIPLIER;
        else
                return val;
}

int intel_freq_opcode(struct intel_rps *rps, int val)
{
        struct drm_i915_private *i915 = rps_to_i915(rps);

        if (GRAPHICS_VER(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 if (GRAPHICS_VER(i915) >= 6)
                return DIV_ROUND_CLOSEST(val, GT_FREQUENCY_MULTIPLIER);
        else
                return val;
}

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_dbg(&i915->drm, "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_dbg(&i915->drm, "DDR speed: %d MHz\n", i915->mem_freq);

        rps->max_freq = vlv_rps_max_freq(rps);
        rps->rp0_freq = rps->max_freq;
        drm_dbg(&i915->drm, "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_dbg(&i915->drm, "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_dbg(&i915->drm, "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_dbg(&i915->drm, "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_dbg(&i915->drm, "DDR speed: %d MHz\n", i915->mem_freq);

        rps->max_freq = chv_rps_max_freq(rps);
        rps->rp0_freq = rps->max_freq;
        drm_dbg(&i915->drm, "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_dbg(&i915->drm, "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_dbg(&i915->drm, "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_dbg(&i915->drm, "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));

        drm_WARN_ONCE(&i915->drm, (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);
        struct drm_i915_private *i915 = rps_to_i915(rps);
        bool client_boost = false;
        int new_freq, adj, min, max;
        u32 pm_iir = 0;

        spin_lock_irq(&gt->irq_lock);
        pm_iir = fetch_and_zero(&rps->pm_iir) & rps->pm_events;
        client_boost = atomic_read(&rps->num_waiters);
        spin_unlock_irq(&gt->irq_lock);

        /* Make sure we didn't queue anything we're not going to process. */
        if (!pm_iir && !client_boost)
                goto out;

        mutex_lock(&rps->lock);
        if (!intel_rps_is_active(rps)) {
                mutex_unlock(&rps->lock);
                return;
        }

        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;

        GT_TRACE(gt,
                 "pm_iir:%x, client_boost:%s, last:%d, cur:%x, min:%x, max:%x\n",
                 pm_iir, yesno(client_boost),
                 adj, new_freq, min, max);

        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;
        }

        /*
         * sysfs frequency limits 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_dbg(&i915->drm, "Failed to set new GPU frequency\n");
                adj = 0;
        }
        rps->last_adj = adj;

        mutex_unlock(&rps->lock);

out:
        spin_lock_irq(&gt->irq_lock);
        gen6_gt_pm_unmask_irq(gt, rps->pm_events);
        spin_unlock_irq(&gt->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(&gt->irq_lock);

        if (unlikely(!events))
                return;

        GT_TRACE(gt, "irq events:%x\n", events);

        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);
        u32 events;

        events = pm_iir & rps->pm_events;
        if (events) {
                spin_lock(&gt->irq_lock);

                GT_TRACE(gt, "irq events:%x\n", events);

                gen6_gt_pm_mask_irq(gt, events);
                rps->pm_iir |= events;

                schedule_work(&rps->work);
                spin_unlock(&gt->irq_lock);
        }

        if (GRAPHICS_VER(gt->i915) >= 8)
                return;

        if (pm_iir & PM_VEBOX_USER_INTERRUPT)
                intel_engine_cs_irq(gt->engine[VECS0], pm_iir >> 10);

        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);
        timer_setup(&rps->timer, rps_timer, 0);

        atomic_set(&rps->num_waiters, 0);
}

void intel_rps_init(struct intel_rps *rps)
{
        struct drm_i915_private *i915 = rps_to_i915(rps);

        if (rps_uses_slpc(rps))
                return;

        if (IS_CHERRYVIEW(i915))
                chv_rps_init(rps);
        else if (IS_VALLEYVIEW(i915))
                vlv_rps_init(rps);
        else if (GRAPHICS_VER(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 (GRAPHICS_VER(i915) == 6 || IS_IVYBRIDGE(i915) || IS_HASWELL(i915)) {
                u32 params = 0;

                sandybridge_pcode_read(i915, GEN6_READ_OC_PARAMS,
                                       &params, NULL);
                if (params & BIT(31)) { /* OC supported */
                        drm_dbg(&i915->drm,
                                "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;

        /* Start in the middle, from here we will autotune based on workload */
        rps->cur_freq = rps->efficient_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 (GRAPHICS_VER(i915) <= 7)
                rps->pm_intrmsk_mbz |= GEN6_PM_RP_UP_EI_EXPIRED;

        if (GRAPHICS_VER(i915) >= 8 && GRAPHICS_VER(i915) < 11)
                rps->pm_intrmsk_mbz |= GEN8_PMINTR_DISABLE_REDIRECT_TO_GUC;

        /* GuC needs ARAT expired interrupt unmasked */
        if (intel_uc_uses_guc_submission(&rps_to_gt(rps)->uc))
                rps->pm_intrmsk_mbz |= ARAT_EXPIRED_INTRMSK;
}

void intel_rps_sanitize(struct intel_rps *rps)
{
        if (rps_uses_slpc(rps))
                return;

        if (GRAPHICS_VER(rps_to_i915(rps)) >= 6)
                rps_disable_interrupts(rps);
}

u32 intel_rps_get_cagf(struct intel_rps *rps, u32 rpstat)
{
        struct drm_i915_private *i915 = rps_to_i915(rps);
        u32 cagf;

        if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915))
                cagf = (rpstat >> 8) & 0xff;
        else if (GRAPHICS_VER(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 if (GRAPHICS_VER(i915) >= 6)
                cagf = (rpstat & GEN6_CAGF_MASK) >> GEN6_CAGF_SHIFT;
        else
                cagf = gen5_invert_freq(rps, (rpstat & MEMSTAT_PSTATE_MASK) >>
                                        MEMSTAT_PSTATE_SHIFT);

        return cagf;
}

static u32 read_cagf(struct intel_rps *rps)
{
        struct drm_i915_private *i915 = rps_to_i915(rps);
        struct intel_uncore *uncore = rps_to_uncore(rps);
        u32 freq;

        if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
                vlv_punit_get(i915);
                freq = vlv_punit_read(i915, PUNIT_REG_GPU_FREQ_STS);
                vlv_punit_put(i915);
        } else if (GRAPHICS_VER(i915) >= 6) {
                freq = intel_uncore_read(uncore, GEN6_RPSTAT1);
        } else {
                freq = intel_uncore_read(uncore, MEMSTAT_ILK);
        }

        return intel_rps_get_cagf(rps, freq);
}

u32 intel_rps_read_actual_frequency(struct intel_rps *rps)
{
        struct intel_runtime_pm *rpm = rps_to_uncore(rps)->rpm;
        intel_wakeref_t wakeref;
        u32 freq = 0;

        with_intel_runtime_pm_if_in_use(rpm, wakeref)
                freq = intel_gpu_freq(rps, read_cagf(rps));

        return freq;
}

u32 intel_rps_read_punit_req(struct intel_rps *rps)
{
        struct intel_uncore *uncore = rps_to_uncore(rps);
        struct intel_runtime_pm *rpm = rps_to_uncore(rps)->rpm;
        intel_wakeref_t wakeref;
        u32 freq = 0;

        with_intel_runtime_pm_if_in_use(rpm, wakeref)
                freq = intel_uncore_read(uncore, GEN6_RPNSWREQ);

        return freq;
}

static u32 intel_rps_get_req(u32 pureq)
{
        u32 req = pureq >> GEN9_SW_REQ_UNSLICE_RATIO_SHIFT;

        return req;
}

u32 intel_rps_read_punit_req_frequency(struct intel_rps *rps)
{
        u32 freq = intel_rps_get_req(intel_rps_read_punit_req(rps));

        return intel_gpu_freq(rps, freq);
}

u32 intel_rps_get_requested_frequency(struct intel_rps *rps)
{
        if (rps_uses_slpc(rps))

                return intel_rps_read_punit_req_frequency(rps);
        else
                return intel_gpu_freq(rps, rps->cur_freq);
}

u32 intel_rps_get_max_frequency(struct intel_rps *rps)
{
        struct intel_guc_slpc *slpc = rps_to_slpc(rps);

        if (rps_uses_slpc(rps))
                return slpc->max_freq_softlimit;
        else
                return intel_gpu_freq(rps, rps->max_freq_softlimit);
}

u32 intel_rps_get_rp0_frequency(struct intel_rps *rps)
{
        struct intel_guc_slpc *slpc = rps_to_slpc(rps);

        if (rps_uses_slpc(rps))
                return slpc->rp0_freq;
        else
                return intel_gpu_freq(rps, rps->rp0_freq);
}

u32 intel_rps_get_rp1_frequency(struct intel_rps *rps)
{
        struct intel_guc_slpc *slpc = rps_to_slpc(rps);

        if (rps_uses_slpc(rps))
                return slpc->rp1_freq;
        else
                return intel_gpu_freq(rps, rps->rp1_freq);
}

u32 intel_rps_get_rpn_frequency(struct intel_rps *rps)
{
        struct intel_guc_slpc *slpc = rps_to_slpc(rps);

        if (rps_uses_slpc(rps))
                return slpc->min_freq;
        else
                return intel_gpu_freq(rps, rps->min_freq);
}

static int set_max_freq(struct intel_rps *rps, u32 val)
{
        struct drm_i915_private *i915 = rps_to_i915(rps);
        int ret = 0;

        mutex_lock(&rps->lock);

        val = intel_freq_opcode(rps, val);
        if (val < rps->min_freq ||
            val > rps->max_freq ||
            val < rps->min_freq_softlimit) {
                ret = -EINVAL;
                goto unlock;
        }

        if (val > rps->rp0_freq)
                drm_dbg(&i915->drm, "User requested overclocking to %d\n",
                        intel_gpu_freq(rps, val));

        rps->max_freq_softlimit = val;

        val = clamp_t(int, rps->cur_freq,
                      rps->min_freq_softlimit,
                      rps->max_freq_softlimit);

        /*
         * We still need *_set_rps to process the new max_delay and
         * update the interrupt limits and PMINTRMSK even though
         * frequency request may be unchanged.
         */
        intel_rps_set(rps, val);

unlock:
        mutex_unlock(&rps->lock);

        return ret;
}

int intel_rps_set_max_frequency(struct intel_rps *rps, u32 val)
{
        struct intel_guc_slpc *slpc = rps_to_slpc(rps);

        if (rps_uses_slpc(rps))
                return intel_guc_slpc_set_max_freq(slpc, val);
        else
                return set_max_freq(rps, val);
}

u32 intel_rps_get_min_frequency(struct intel_rps *rps)
{
        struct intel_guc_slpc *slpc = rps_to_slpc(rps);

        if (rps_uses_slpc(rps))
                return slpc->min_freq_softlimit;
        else
                return intel_gpu_freq(rps, rps->min_freq_softlimit);
}

static int set_min_freq(struct intel_rps *rps, u32 val)
{
        int ret = 0;

        mutex_lock(&rps->lock);

        val = intel_freq_opcode(rps, val);
        if (val < rps->min_freq ||
            val > rps->max_freq ||
            val > rps->max_freq_softlimit) {
                ret = -EINVAL;
                goto unlock;
        }

        rps->min_freq_softlimit = val;

        val = clamp_t(int, rps->cur_freq,
                      rps->min_freq_softlimit,
                      rps->max_freq_softlimit);

        /*
         * We still need *_set_rps to process the new min_delay and
         * update the interrupt limits and PMINTRMSK even though
         * frequency request may be unchanged.
         */
        intel_rps_set(rps, val);

unlock:
        mutex_unlock(&rps->lock);

        return ret;
}

int intel_rps_set_min_frequency(struct intel_rps *rps, u32 val)
{
        struct intel_guc_slpc *slpc = rps_to_slpc(rps);

        if (rps_uses_slpc(rps))
                return intel_guc_slpc_set_min_freq(slpc, val);
        else
                return set_min_freq(rps, val);
}

/* 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 (GRAPHICS_VER(gt->i915) == 5) {
                GEM_BUG_ON(ips_mchdev);
                rcu_assign_pointer(ips_mchdev, gt->i915);
                ips_ping_for_i915_load();
        }
}

void intel_rps_driver_unregister(struct intel_rps *rps)
{
        if (rcu_access_pointer(ips_mchdev) == rps_to_i915(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 (i915 && !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);

#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftest_rps.c"
#include "selftest_slpc.c"
#endif