/*
* SPDX-License-Identifier: MIT
*
* Copyright © 2019 Intel Corporation
*/
#include <drm/i915_drm.h>
#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 inline void set(struct intel_uncore *uncore, i915_reg_t reg, u32 val)
{
intel_uncore_write_fw(uncore, reg, val);
}
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 &= READ_ONCE(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);
u32 events;
rps_reset_ei(rps);
if (IS_VALLEYVIEW(gt->i915))
/* WaGsvRC0ResidencyMethod:vlv */
events = GEN6_PM_RP_UP_EI_EXPIRED;
else
events = (GEN6_PM_RP_UP_THRESHOLD |
GEN6_PM_RP_DOWN_THRESHOLD |
GEN6_PM_RP_DOWN_TIMEOUT);
WRITE_ONCE(rps->pm_events, events);
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->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(>->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);
WRITE_ONCE(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;
set(uncore, GEN6_RP_UP_EI, GT_INTERVAL_FROM_US(i915, ei_up));
set(uncore, GEN6_RP_UP_THRESHOLD,
GT_INTERVAL_FROM_US(i915, ei_up * threshold_up / 100));
set(uncore, GEN6_RP_DOWN_EI, GT_INTERVAL_FROM_US(i915, ei_down));
set(uncore, GEN6_RP_DOWN_THRESHOLD,
GT_INTERVAL_FROM_US(i915, ei_down * threshold_down / 100));
set(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++ && READ_ONCE(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);
set(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, bool update)
{
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;
if (update)
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);
WRITE_ONCE(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);
WRITE_ONCE(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, 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.)
*/
rps->cur_freq =
max_t(int, round_down(rps->cur_freq - 1, 2), rps->min_freq);
}
void intel_rps_boost(struct i915_request *rq)
{
struct intel_rps *rps = &READ_ONCE(rq->engine)->gt->rps;
unsigned long flags;
if (i915_request_signaled(rq) || !READ_ONCE(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)) {
set_bit(I915_FENCE_FLAG_BOOST, &rq->fence.flags);
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;
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, true);
if (err)
return err;
/*
* 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);
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) || 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, true)) {
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 */
drm_WARN_ONCE(&i915->drm, (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 */
drm_WARN_ONCE(&i915->drm, (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;
drm_WARN_ON(&i915->drm, rps->max_freq < rps->min_freq);
drm_WARN_ON(&i915->drm, rps->idle_freq > rps->max_freq);
drm_WARN_ON(&i915->drm, rps->efficient_freq < rps->min_freq);
drm_WARN_ON(&i915->drm, rps->efficient_freq > rps->max_freq);
}
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);
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));
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);
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) & READ_ONCE(rps->pm_events);
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 && !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);
u32 events;
events = pm_iir & READ_ONCE(rps->pm_events);
if (events) {
spin_lock(>->irq_lock);
gen6_gt_pm_mask_irq(gt, events);
rps->pm_iir |= 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_signal_breadcrumbs(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 && INTEL_GEN(i915) < 11)
rps->pm_intrmsk_mbz |= GEN8_PMINTR_DISABLE_REDIRECT_TO_GUC;
}
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 (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;
}
static u32 read_cagf(struct intel_rps *rps)
{
struct drm_i915_private *i915 = rps_to_i915(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 {
freq = intel_uncore_read(rps_to_gt(rps)->uncore, GEN6_RPSTAT1);
}
return intel_rps_get_cagf(rps, freq);
}
u32 intel_rps_read_actual_frequency(struct intel_rps *rps)
{
struct intel_runtime_pm *rpm = rps_to_gt(rps)->uncore->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;
}
/* 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)) {
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 (!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);
