Re: [PATCH] drm/i915/bdw: BDW Software Turbo

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On Mon, 16 Jun 2014 13:13:38 -0700
Daisy Sun <daisy.sun@xxxxxxxxx> wrote:

> BDW supports GT C0 residency reporting in constant time unit. Driver calculates 
> GT utilization based on C0 residency and adjusts RP frequency up/down 
> accordingly.
> 
> Signed-off-by: Daisy Sun <daisy.sun@xxxxxxxxx>
> 
> ---
>  drivers/gpu/drm/i915/i915_drv.h      |  17 ++++
>  drivers/gpu/drm/i915/i915_irq.c      |  10 +++
>  drivers/gpu/drm/i915/i915_reg.h      |   4 +
>  drivers/gpu/drm/i915/intel_display.c |   2 +
>  drivers/gpu/drm/i915/intel_drv.h     |   1 +
>  drivers/gpu/drm/i915/intel_pm.c      | 148 +++++++++++++++++++++++++++++------
>  6 files changed, 158 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 6b0e174..3a52e84 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -880,6 +880,19 @@ struct vlv_s0ix_state {
>  	u32 clock_gate_dis2;
>  };
>  
> +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 intel_gen6_power_mgmt {
>  	/* work and pm_iir are protected by dev_priv->irq_lock */
>  	struct work_struct work;
> @@ -910,6 +923,9 @@ struct intel_gen6_power_mgmt {
>  	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  */
> +
>  	/*
>  	 * Protects RPS/RC6 register access and PCU communication.
>  	 * Must be taken after struct_mutex if nested.
> @@ -2579,6 +2595,7 @@ extern void intel_disable_fbc(struct drm_device *dev);
>  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 valleyview_set_rps(struct drm_device *dev, u8 val);
>  extern int valleyview_rps_max_freq(struct drm_i915_private *dev_priv);
>  extern int valleyview_rps_min_freq(struct drm_i915_private *dev_priv);
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index b10fbde..9ad1e93 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -1530,6 +1530,16 @@ static void i9xx_pipe_crc_irq_handler(struct drm_device *dev, enum pipe pipe)
>  				     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;
> +
> +	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 122ed3f..d929f3b 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5240,6 +5240,10 @@ enum punit_power_well {
>  #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 767ca96..2a45617 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -9176,6 +9176,8 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
>  	unsigned long flags;
>  	int ret;
>  
> +	gen8_flip_interrupt(dev);
> +
>  	/* Can't change pixel format via MI display flips. */
>  	if (fb->pixel_format != crtc->primary->fb->pixel_format)
>  		return -EINVAL;
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index acfc5c8..b8f375e 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -948,6 +948,7 @@ void ironlake_teardown_rc6(struct drm_device *dev);
>  void gen6_update_ring_freq(struct drm_device *dev);
>  void gen6_rps_idle(struct drm_i915_private *dev_priv);
>  void gen6_rps_boost(struct drm_i915_private *dev_priv);
> +void gen8_flip_interrupt(struct drm_device *dev);
>  void intel_aux_display_runtime_get(struct drm_i915_private *dev_priv);
>  void intel_aux_display_runtime_put(struct drm_i915_private *dev_priv);
>  void intel_runtime_pm_get(struct drm_i915_private *dev_priv);
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 7699d7a..880522d 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3011,6 +3011,9 @@ static void gen6_set_rps_thresholds(struct drm_i915_private *dev_priv, u8 val)
>  {
>  	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:
> @@ -3376,13 +3379,80 @@ static void parse_rp_state_cap(struct drm_i915_private *dev_priv, u32 rp_state_c
>  		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;
> +}
> +
> +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,
> +			&current_time, &current_c0);
> +	bdw_sw_calculate_freq(dev, &dev_priv->rps.sw_turbo.down,
> +			&current_time, &current_c0);
> +}
> +
>  static void gen8_enable_rps(struct drm_device *dev)
>  {
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	struct intel_ring_buffer *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);
>  
> @@ -3418,35 +3488,63 @@ static void gen8_enable_rps(struct drm_device *dev)
>  		   HSW_FREQUENCY(dev_priv->rps.rp1_freq));
>  	I915_WRITE(GEN6_RC_VIDEO_FREQ,
>  		   HSW_FREQUENCY(dev_priv->rps.rp1_freq));
> -	/* NB: Docs say 1s, and 1000000 - which aren't equivalent */
> -	I915_WRITE(GEN6_RP_DOWN_TIMEOUT, 100000000 / 128); /* 1 second timeout */
> -
> -	/* 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, 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? */
>  
> -	I915_WRITE(GEN6_RP_IDLE_HYSTERSIS, 10);
> +	ei_up = 84480; /* 84.48ms */
> +	ei_down = 448000;
> +	threshold_up_pct = 90; /* x percent busy */
> +	threshold_down_pct = 70;
> +
> +	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;
> +
> +		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;
> +	} 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));
>  
> -	/* 5: Enable RPS */
> -	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);
> +		/* 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);
>  
> -	/* 6: Ring frequency + overclocking (our driver does this later */
> +		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));
>  
> -	gen6_set_rps(dev, (I915_READ(GEN6_GT_PERF_STATUS) & 0xff00) >> 8);
> +		I915_WRITE(GEN6_RP_IDLE_HYSTERSIS, 10);
> +	}
>  
> -	gen6_enable_rps_interrupts(dev);
> +	/* 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, rp_ctl_flag);
> +
> +	/* 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)
> +		gen6_enable_rps_interrupts(dev);
>  
>  	gen6_gt_force_wake_put(dev_priv, FORCEWAKE_ALL);
>  }
> @@ -4628,6 +4726,8 @@ static void intel_gen6_powersave_work(struct work_struct *work)
>  			     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_VALLEYVIEW(dev)) {

https://bugs.freedesktop.org/show_bug.cgi?id=77869 looks like it's
potentially related, though that one affects HSW too, so not sure.

-- 
Jesse Barnes, Intel Open Source Technology Center
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