Revert "drm/i915/bdw: BDW Software Turbo"
This reverts commit c76bb61a71083b2d90504cc6d0dda2047c5d63ca.
It's apparently too broken so that Rodrigo submitted a patch to add a
config option for it. Given that the design is also ... suboptimal and
that I've only merged this to get lead engineers and managers off my
back for one second let's just revert this.
/me puts on combat gear again
It was worth a shot ...
References: http://mid.mail-archive.com/1411686380-1953-1-git-send-email-rodrigo.vivi@intel.com
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Daisy Sun <daisy.sun@intel.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 17dfce0..32180ac 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -945,23 +945,6 @@
u32 media_c0;
};
-struct intel_rps_bdw_cal {
- u32 it_threshold_pct; /* interrupt, in percentage */
- u32 eval_interval; /* evaluation interval, in us */
- u32 last_ts;
- u32 last_c0;
- bool is_up;
-};
-
-struct intel_rps_bdw_turbo {
- struct intel_rps_bdw_cal up;
- struct intel_rps_bdw_cal down;
- struct timer_list flip_timer;
- u32 timeout;
- atomic_t flip_received;
- struct work_struct work_max_freq;
-};
-
struct intel_gen6_power_mgmt {
/* work and pm_iir are protected by dev_priv->irq_lock */
struct work_struct work;
@@ -995,9 +978,6 @@
bool enabled;
struct delayed_work delayed_resume_work;
- bool is_bdw_sw_turbo; /* Switch of BDW software turbo */
- struct intel_rps_bdw_turbo sw_turbo; /* Calculate RP interrupt timing */
-
/* manual wa residency calculations */
struct intel_rps_ei up_ei, down_ei;
@@ -2828,8 +2808,6 @@
extern bool ironlake_set_drps(struct drm_device *dev, u8 val);
extern void intel_init_pch_refclk(struct drm_device *dev);
extern void gen6_set_rps(struct drm_device *dev, u8 val);
-extern void bdw_software_turbo(struct drm_device *dev);
-extern void gen8_flip_interrupt(struct drm_device *dev);
extern void valleyview_set_rps(struct drm_device *dev, u8 val);
extern void intel_set_memory_cxsr(struct drm_i915_private *dev_priv,
bool enable);
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index c96ddc9..3201986 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1979,27 +1979,6 @@
res1, res2);
}
-void gen8_flip_interrupt(struct drm_device *dev)
-{
- struct drm_i915_private *dev_priv = dev->dev_private;
-
- if (!dev_priv->rps.is_bdw_sw_turbo)
- return;
-
- if(atomic_read(&dev_priv->rps.sw_turbo.flip_received)) {
- mod_timer(&dev_priv->rps.sw_turbo.flip_timer,
- usecs_to_jiffies(dev_priv->rps.sw_turbo.timeout) + jiffies);
- }
- else {
- dev_priv->rps.sw_turbo.flip_timer.expires =
- usecs_to_jiffies(dev_priv->rps.sw_turbo.timeout) + jiffies;
- add_timer(&dev_priv->rps.sw_turbo.flip_timer);
- atomic_set(&dev_priv->rps.sw_turbo.flip_received, true);
- }
-
- bdw_software_turbo(dev);
-}
-
/* The RPS events need forcewake, so we add them to a work queue and mask their
* IMR bits until the work is done. Other interrupts can be processed without
* the work queue. */
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index ad8179b..e887d4c 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5585,10 +5585,6 @@
#define GEN8_UCGCTL6 0x9430
#define GEN8_SDEUNIT_CLOCK_GATE_DISABLE (1<<14)
-#define TIMESTAMP_CTR 0x44070
-#define FREQ_1_28_US(us) (((us) * 100) >> 7)
-#define MCHBAR_PCU_C0 (MCHBAR_MIRROR_BASE_SNB + 0x5960)
-
#define GEN6_GFXPAUSE 0xA000
#define GEN6_RPNSWREQ 0xA008
#define GEN6_TURBO_DISABLE (1<<31)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index c5079f2..2d42580 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9926,9 +9926,6 @@
unsigned long flags;
int ret;
- //trigger software GT busyness calculation
- gen8_flip_interrupt(dev);
-
/*
* drm_mode_page_flip_ioctl() should already catch this, but double
* check to be safe. In the future we may enable pageflipping from
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 675e8a2..45f2aa0 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2285,6 +2285,7 @@
else
return 2;
}
+
static void intel_print_wm_latency(struct drm_device *dev,
const char *name,
const uint16_t wm[5])
@@ -3253,9 +3254,6 @@
{
int new_power;
- if (dev_priv->rps.is_bdw_sw_turbo)
- return;
-
new_power = dev_priv->rps.power;
switch (dev_priv->rps.power) {
case LOW_POWER:
@@ -3463,11 +3461,8 @@
valleyview_set_rps(dev_priv->dev, dev_priv->rps.min_freq_softlimit);
else if (IS_VALLEYVIEW(dev))
vlv_set_rps_idle(dev_priv);
- else if (!dev_priv->rps.is_bdw_sw_turbo
- || atomic_read(&dev_priv->rps.sw_turbo.flip_received)){
+ else
gen6_set_rps(dev_priv->dev, dev_priv->rps.min_freq_softlimit);
- }
-
dev_priv->rps.last_adj = 0;
}
mutex_unlock(&dev_priv->rps.hw_lock);
@@ -3481,11 +3476,8 @@
if (dev_priv->rps.enabled) {
if (IS_VALLEYVIEW(dev))
valleyview_set_rps(dev_priv->dev, dev_priv->rps.max_freq_softlimit);
- else if (!dev_priv->rps.is_bdw_sw_turbo
- || atomic_read(&dev_priv->rps.sw_turbo.flip_received)){
+ else
gen6_set_rps(dev_priv->dev, dev_priv->rps.max_freq_softlimit);
- }
-
dev_priv->rps.last_adj = 0;
}
mutex_unlock(&dev_priv->rps.hw_lock);
@@ -3520,26 +3512,21 @@
static void gen8_disable_rps_interrupts(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
- if (IS_BROADWELL(dev) && dev_priv->rps.is_bdw_sw_turbo){
- if (atomic_read(&dev_priv->rps.sw_turbo.flip_received))
- del_timer(&dev_priv->rps.sw_turbo.flip_timer);
- dev_priv-> rps.is_bdw_sw_turbo = false;
- } else {
- I915_WRITE(GEN6_PMINTRMSK, ~GEN8_PMINTR_REDIRECT_TO_NON_DISP);
- I915_WRITE(GEN8_GT_IER(2), I915_READ(GEN8_GT_IER(2)) &
- ~dev_priv->pm_rps_events);
- /* Complete PM interrupt masking here doesn't race with the rps work
- * item again unmasking PM interrupts because that is using a different
- * register (GEN8_GT_IMR(2)) to mask PM interrupts. The only risk is in
- * leaving stale bits in GEN8_GT_IIR(2) and GEN8_GT_IMR(2) which
- * gen8_enable_rps will clean up. */
- spin_lock_irq(&dev_priv->irq_lock);
- dev_priv->rps.pm_iir = 0;
- spin_unlock_irq(&dev_priv->irq_lock);
+ I915_WRITE(GEN6_PMINTRMSK, ~GEN8_PMINTR_REDIRECT_TO_NON_DISP);
+ I915_WRITE(GEN8_GT_IER(2), I915_READ(GEN8_GT_IER(2)) &
+ ~dev_priv->pm_rps_events);
+ /* Complete PM interrupt masking here doesn't race with the rps work
+ * item again unmasking PM interrupts because that is using a different
+ * register (GEN8_GT_IMR(2)) to mask PM interrupts. The only risk is in
+ * leaving stale bits in GEN8_GT_IIR(2) and GEN8_GT_IMR(2) which
+ * gen8_enable_rps will clean up. */
- I915_WRITE(GEN8_GT_IIR(2), dev_priv->pm_rps_events);
- }
+ spin_lock_irq(&dev_priv->irq_lock);
+ dev_priv->rps.pm_iir = 0;
+ spin_unlock_irq(&dev_priv->irq_lock);
+
+ I915_WRITE(GEN8_GT_IIR(2), dev_priv->pm_rps_events);
}
static void gen6_disable_rps_interrupts(struct drm_device *dev)
@@ -3697,111 +3684,13 @@
dev_priv->rps.min_freq_softlimit = dev_priv->rps.min_freq;
}
-static void bdw_sw_calculate_freq(struct drm_device *dev,
- struct intel_rps_bdw_cal *c, u32 *cur_time, u32 *c0)
-{
- struct drm_i915_private *dev_priv = dev->dev_private;
- u64 busy = 0;
- u32 busyness_pct = 0;
- u32 elapsed_time = 0;
- u16 new_freq = 0;
-
- if (!c || !cur_time || !c0)
- return;
-
- if (0 == c->last_c0)
- goto out;
-
- /* Check Evaluation interval */
- elapsed_time = *cur_time - c->last_ts;
- if (elapsed_time < c->eval_interval)
- return;
-
- mutex_lock(&dev_priv->rps.hw_lock);
-
- /*
- * c0 unit in 32*1.28 usec, elapsed_time unit in 1 usec.
- * Whole busyness_pct calculation should be
- * busy = ((u64)(*c0 - c->last_c0) << 5 << 7) / 100;
- * busyness_pct = (u32)(busy * 100 / elapsed_time);
- * The final formula is to simplify CPU calculation
- */
- busy = (u64)(*c0 - c->last_c0) << 12;
- do_div(busy, elapsed_time);
- busyness_pct = (u32)busy;
-
- if (c->is_up && busyness_pct >= c->it_threshold_pct)
- new_freq = (u16)dev_priv->rps.cur_freq + 3;
- if (!c->is_up && busyness_pct <= c->it_threshold_pct)
- new_freq = (u16)dev_priv->rps.cur_freq - 1;
-
- /* Adjust to new frequency busyness and compare with threshold */
- if (0 != new_freq) {
- if (new_freq > dev_priv->rps.max_freq_softlimit)
- new_freq = dev_priv->rps.max_freq_softlimit;
- else if (new_freq < dev_priv->rps.min_freq_softlimit)
- new_freq = dev_priv->rps.min_freq_softlimit;
-
- gen6_set_rps(dev, new_freq);
- }
-
- mutex_unlock(&dev_priv->rps.hw_lock);
-
-out:
- c->last_c0 = *c0;
- c->last_ts = *cur_time;
-}
-
-static void gen8_set_frequency_RP0(struct work_struct *work)
-{
- struct intel_rps_bdw_turbo *p_bdw_turbo =
- container_of(work, struct intel_rps_bdw_turbo, work_max_freq);
- struct intel_gen6_power_mgmt *p_power_mgmt =
- container_of(p_bdw_turbo, struct intel_gen6_power_mgmt, sw_turbo);
- struct drm_i915_private *dev_priv =
- container_of(p_power_mgmt, struct drm_i915_private, rps);
-
- mutex_lock(&dev_priv->rps.hw_lock);
- gen6_set_rps(dev_priv->dev, dev_priv->rps.rp0_freq);
- mutex_unlock(&dev_priv->rps.hw_lock);
-}
-
-static void flip_active_timeout_handler(unsigned long var)
-{
- struct drm_i915_private *dev_priv = (struct drm_i915_private *) var;
-
- del_timer(&dev_priv->rps.sw_turbo.flip_timer);
- atomic_set(&dev_priv->rps.sw_turbo.flip_received, false);
-
- queue_work(dev_priv->wq, &dev_priv->rps.sw_turbo.work_max_freq);
-}
-
-void bdw_software_turbo(struct drm_device *dev)
-{
- struct drm_i915_private *dev_priv = dev->dev_private;
-
- u32 current_time = I915_READ(TIMESTAMP_CTR); /* unit in usec */
- u32 current_c0 = I915_READ(MCHBAR_PCU_C0); /* unit in 32*1.28 usec */
-
- bdw_sw_calculate_freq(dev, &dev_priv->rps.sw_turbo.up,
- ¤t_time, ¤t_c0);
- bdw_sw_calculate_freq(dev, &dev_priv->rps.sw_turbo.down,
- ¤t_time, ¤t_c0);
-}
-
static void gen8_enable_rps(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_engine_cs *ring;
uint32_t rc6_mask = 0, rp_state_cap;
- uint32_t threshold_up_pct, threshold_down_pct;
- uint32_t ei_up, ei_down; /* up and down evaluation interval */
- u32 rp_ctl_flag;
int unused;
- /* Use software Turbo for BDW */
- dev_priv->rps.is_bdw_sw_turbo = IS_BROADWELL(dev);
-
/* 1a: Software RC state - RC0 */
I915_WRITE(GEN6_RC_STATE, 0);
@@ -3845,74 +3734,35 @@
HSW_FREQUENCY(dev_priv->rps.rp1_freq));
I915_WRITE(GEN6_RC_VIDEO_FREQ,
HSW_FREQUENCY(dev_priv->rps.rp1_freq));
- ei_up = 84480; /* 84.48ms */
- ei_down = 448000;
- threshold_up_pct = 90; /* x percent busy */
- threshold_down_pct = 70;
+ /* NB: Docs say 1s, and 1000000 - which aren't equivalent */
+ I915_WRITE(GEN6_RP_DOWN_TIMEOUT, 100000000 / 128); /* 1 second timeout */
- if (dev_priv->rps.is_bdw_sw_turbo) {
- dev_priv->rps.sw_turbo.up.it_threshold_pct = threshold_up_pct;
- dev_priv->rps.sw_turbo.up.eval_interval = ei_up;
- dev_priv->rps.sw_turbo.up.is_up = true;
- dev_priv->rps.sw_turbo.up.last_ts = 0;
- dev_priv->rps.sw_turbo.up.last_c0 = 0;
+ /* Docs recommend 900MHz, and 300 MHz respectively */
+ I915_WRITE(GEN6_RP_INTERRUPT_LIMITS,
+ dev_priv->rps.max_freq_softlimit << 24 |
+ dev_priv->rps.min_freq_softlimit << 16);
- dev_priv->rps.sw_turbo.down.it_threshold_pct = threshold_down_pct;
- dev_priv->rps.sw_turbo.down.eval_interval = ei_down;
- dev_priv->rps.sw_turbo.down.is_up = false;
- dev_priv->rps.sw_turbo.down.last_ts = 0;
- dev_priv->rps.sw_turbo.down.last_c0 = 0;
+ I915_WRITE(GEN6_RP_UP_THRESHOLD, 7600000 / 128); /* 76ms busyness per EI, 90% */
+ I915_WRITE(GEN6_RP_DOWN_THRESHOLD, 31300000 / 128); /* 313ms busyness per EI, 70%*/
+ I915_WRITE(GEN6_RP_UP_EI, 66000); /* 84.48ms, XXX: random? */
+ I915_WRITE(GEN6_RP_DOWN_EI, 350000); /* 448ms, XXX: random? */
- /* Start the timer to track if flip comes*/
- dev_priv->rps.sw_turbo.timeout = 200*1000; /* in us */
-
- init_timer(&dev_priv->rps.sw_turbo.flip_timer);
- dev_priv->rps.sw_turbo.flip_timer.function = flip_active_timeout_handler;
- dev_priv->rps.sw_turbo.flip_timer.data = (unsigned long) dev_priv;
- dev_priv->rps.sw_turbo.flip_timer.expires =
- usecs_to_jiffies(dev_priv->rps.sw_turbo.timeout) + jiffies;
- add_timer(&dev_priv->rps.sw_turbo.flip_timer);
- INIT_WORK(&dev_priv->rps.sw_turbo.work_max_freq, gen8_set_frequency_RP0);
-
- atomic_set(&dev_priv->rps.sw_turbo.flip_received, true);
- } else {
- /* NB: Docs say 1s, and 1000000 - which aren't equivalent
- * 1 second timeout*/
- I915_WRITE(GEN6_RP_DOWN_TIMEOUT, FREQ_1_28_US(1000000));
-
- /* Docs recommend 900MHz, and 300 MHz respectively */
- I915_WRITE(GEN6_RP_INTERRUPT_LIMITS,
- dev_priv->rps.max_freq_softlimit << 24 |
- dev_priv->rps.min_freq_softlimit << 16);
-
- I915_WRITE(GEN6_RP_UP_THRESHOLD,
- FREQ_1_28_US(ei_up * threshold_up_pct / 100));
- I915_WRITE(GEN6_RP_DOWN_THRESHOLD,
- FREQ_1_28_US(ei_down * threshold_down_pct / 100));
- I915_WRITE(GEN6_RP_UP_EI,
- FREQ_1_28_US(ei_up));
- I915_WRITE(GEN6_RP_DOWN_EI,
- FREQ_1_28_US(ei_down));
-
- I915_WRITE(GEN6_RP_IDLE_HYSTERSIS, 10);
- }
+ I915_WRITE(GEN6_RP_IDLE_HYSTERSIS, 10);
/* 5: Enable RPS */
- rp_ctl_flag = GEN6_RP_MEDIA_TURBO |
- GEN6_RP_MEDIA_HW_NORMAL_MODE |
- GEN6_RP_MEDIA_IS_GFX |
- GEN6_RP_UP_BUSY_AVG |
- GEN6_RP_DOWN_IDLE_AVG;
- if (!dev_priv->rps.is_bdw_sw_turbo)
- rp_ctl_flag |= GEN6_RP_ENABLE;
+ I915_WRITE(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_AVG);
- I915_WRITE(GEN6_RP_CONTROL, rp_ctl_flag);
+ /* 6: Ring frequency + overclocking (our driver does this later */
- /* 6: Ring frequency + overclocking
- * (our driver does this later */
gen6_set_rps(dev, (I915_READ(GEN6_GT_PERF_STATUS) & 0xff00) >> 8);
- if (!dev_priv->rps.is_bdw_sw_turbo)
- gen8_enable_rps_interrupts(dev);
+
+ gen8_enable_rps_interrupts(dev);
gen6_gt_force_wake_put(dev_priv, FORCEWAKE_ALL);
}
@@ -5386,8 +5236,6 @@
rps.delayed_resume_work.work);
struct drm_device *dev = dev_priv->dev;
- dev_priv->rps.is_bdw_sw_turbo = false;
-
mutex_lock(&dev_priv->rps.hw_lock);
if (IS_CHERRYVIEW(dev)) {