drm/i915: dynamic render p-state support for Sandy Bridge
Add an interrupt handler for switching graphics frequencies and handling
PM interrupts. This should allow for increased performance when busy
and lower power consumption when idle.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 864e75d..92f7578 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -797,15 +797,51 @@
struct drm_info_node *node = (struct drm_info_node *) m->private;
struct drm_device *dev = node->minor->dev;
drm_i915_private_t *dev_priv = dev->dev_private;
- u16 rgvswctl = I915_READ16(MEMSWCTL);
- u16 rgvstat = I915_READ16(MEMSTAT_ILK);
- seq_printf(m, "Requested P-state: %d\n", (rgvswctl >> 8) & 0xf);
- seq_printf(m, "Requested VID: %d\n", rgvswctl & 0x3f);
- seq_printf(m, "Current VID: %d\n", (rgvstat & MEMSTAT_VID_MASK) >>
- MEMSTAT_VID_SHIFT);
- seq_printf(m, "Current P-state: %d\n",
- (rgvstat & MEMSTAT_PSTATE_MASK) >> MEMSTAT_PSTATE_SHIFT);
+ if (IS_GEN5(dev)) {
+ u16 rgvswctl = I915_READ16(MEMSWCTL);
+ u16 rgvstat = I915_READ16(MEMSTAT_ILK);
+
+ seq_printf(m, "Requested P-state: %d\n", (rgvswctl >> 8) & 0xf);
+ seq_printf(m, "Requested VID: %d\n", rgvswctl & 0x3f);
+ seq_printf(m, "Current VID: %d\n", (rgvstat & MEMSTAT_VID_MASK) >>
+ MEMSTAT_VID_SHIFT);
+ seq_printf(m, "Current P-state: %d\n",
+ (rgvstat & MEMSTAT_PSTATE_MASK) >> MEMSTAT_PSTATE_SHIFT);
+ } else if (IS_GEN6(dev)) {
+ u32 gt_perf_status = I915_READ(GEN6_GT_PERF_STATUS);
+ u32 rp_state_limits = I915_READ(GEN6_RP_STATE_LIMITS);
+ u32 rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
+ int max_freq;
+
+ /* RPSTAT1 is in the GT power well */
+ __gen6_force_wake_get(dev_priv);
+
+ seq_printf(m, "GT_PERF_STATUS: 0x%08x\n", gt_perf_status);
+ seq_printf(m, "RPSTAT1: 0x%08x\n", I915_READ(GEN6_RPSTAT1));
+ seq_printf(m, "Render p-state ratio: %d\n",
+ (gt_perf_status & 0xff00) >> 8);
+ seq_printf(m, "Render p-state VID: %d\n",
+ gt_perf_status & 0xff);
+ seq_printf(m, "Render p-state limit: %d\n",
+ rp_state_limits & 0xff);
+
+ max_freq = (rp_state_cap & 0xff0000) >> 16;
+ seq_printf(m, "Lowest (RPN) frequency: %dMHz\n",
+ max_freq * 100);
+
+ max_freq = (rp_state_cap & 0xff00) >> 8;
+ seq_printf(m, "Nominal (RP1) frequency: %dMHz\n",
+ max_freq * 100);
+
+ max_freq = rp_state_cap & 0xff;
+ seq_printf(m, "Max non-overclocked (RP0) frequency: %dMHz\n",
+ max_freq * 100);
+
+ __gen6_force_wake_put(dev_priv);
+ } else {
+ seq_printf(m, "no P-state info available\n");
+ }
return 0;
}
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 53dfc83..2a653cc 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1264,6 +1264,7 @@
extern void intel_enable_fbc(struct drm_crtc *crtc, unsigned long interval);
extern bool intel_fbc_enabled(struct drm_device *dev);
extern bool ironlake_set_drps(struct drm_device *dev, u8 val);
+extern void gen6_set_rps(struct drm_device *dev, u8 val);
extern void intel_detect_pch (struct drm_device *dev);
extern int intel_trans_dp_port_sel (struct drm_crtc *crtc);
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index adf983f..0dadc02 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -397,11 +397,49 @@
jiffies + msecs_to_jiffies(DRM_I915_HANGCHECK_PERIOD));
}
+static void gen6_pm_irq_handler(struct drm_device *dev)
+{
+ drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
+ u8 new_delay = dev_priv->cur_delay;
+ u32 pm_iir;
+
+ pm_iir = I915_READ(GEN6_PMIIR);
+ if (!pm_iir)
+ return;
+
+ if (pm_iir & GEN6_PM_RP_UP_THRESHOLD) {
+ if (dev_priv->cur_delay != dev_priv->max_delay)
+ new_delay = dev_priv->cur_delay + 1;
+ if (new_delay > dev_priv->max_delay)
+ new_delay = dev_priv->max_delay;
+ } else if (pm_iir & (GEN6_PM_RP_DOWN_THRESHOLD | GEN6_PM_RP_DOWN_TIMEOUT)) {
+ if (dev_priv->cur_delay != dev_priv->min_delay)
+ new_delay = dev_priv->cur_delay - 1;
+ if (new_delay < dev_priv->min_delay) {
+ new_delay = dev_priv->min_delay;
+ I915_WRITE(GEN6_RP_INTERRUPT_LIMITS,
+ I915_READ(GEN6_RP_INTERRUPT_LIMITS) |
+ ((new_delay << 16) & 0x3f0000));
+ } else {
+ /* Make sure we continue to get down interrupts
+ * until we hit the minimum frequency */
+ I915_WRITE(GEN6_RP_INTERRUPT_LIMITS,
+ I915_READ(GEN6_RP_INTERRUPT_LIMITS) & ~0x3f0000);
+ }
+
+ }
+
+ gen6_set_rps(dev, new_delay);
+ dev_priv->cur_delay = new_delay;
+
+ I915_WRITE(GEN6_PMIIR, pm_iir);
+}
+
static irqreturn_t ironlake_irq_handler(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
int ret = IRQ_NONE;
- u32 de_iir, gt_iir, de_ier, pch_iir;
+ u32 de_iir, gt_iir, de_ier, pch_iir, pm_iir;
u32 hotplug_mask;
struct drm_i915_master_private *master_priv;
u32 bsd_usr_interrupt = GT_BSD_USER_INTERRUPT;
@@ -417,8 +455,10 @@
de_iir = I915_READ(DEIIR);
gt_iir = I915_READ(GTIIR);
pch_iir = I915_READ(SDEIIR);
+ pm_iir = I915_READ(GEN6_PMIIR);
- if (de_iir == 0 && gt_iir == 0 && pch_iir == 0)
+ if (de_iir == 0 && gt_iir == 0 && pch_iir == 0 &&
+ (!IS_GEN6(dev) || pm_iir == 0))
goto done;
if (HAS_PCH_CPT(dev))
@@ -470,6 +510,9 @@
i915_handle_rps_change(dev);
}
+ if (IS_GEN6(dev))
+ gen6_pm_irq_handler(dev);
+
/* should clear PCH hotplug event before clear CPU irq */
I915_WRITE(SDEIIR, pch_iir);
I915_WRITE(GTIIR, gt_iir);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index c2231f7..d60860e 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1188,6 +1188,10 @@
#define DDRMPLL1 0X12c20
#define PEG_BAND_GAP_DATA 0x14d68
+#define GEN6_GT_PERF_STATUS 0x145948
+#define GEN6_RP_STATE_LIMITS 0x145994
+#define GEN6_RP_STATE_CAP 0x145998
+
/*
* Logical Context regs
*/
@@ -3169,7 +3173,7 @@
#define FORCEWAKE 0xA18C
#define FORCEWAKE_ACK 0x130090
-#define GEN6_RC_NORMAL_FREQ 0xA008
+#define GEN6_RPNSWREQ 0xA008
#define GEN6_TURBO_DISABLE (1<<31)
#define GEN6_FREQUENCY(x) ((x)<<25)
#define GEN6_OFFSET(x) ((x)<<19)
@@ -3185,6 +3189,7 @@
#define GEN6_RC_CTL_HW_ENABLE (1<<31)
#define GEN6_RP_DOWN_TIMEOUT 0xA010
#define GEN6_RP_INTERRUPT_LIMITS 0xA014
+#define GEN6_RPSTAT1 0xA01C
#define GEN6_RP_CONTROL 0xA024
#define GEN6_RP_MEDIA_TURBO (1<<11)
#define GEN6_RP_USE_NORMAL_FREQ (1<<9)
@@ -3208,6 +3213,7 @@
#define GEN6_RC6_THRESHOLD 0xA0B8
#define GEN6_RC6p_THRESHOLD 0xA0BC
#define GEN6_RC6pp_THRESHOLD 0xA0C0
+#define GEN6_PMINTRMSK 0xA168
#define GEN6_PMISR 0x44020
#define GEN6_PMIMR 0x44024
diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c
index a311809..f623efd 100644
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -817,8 +817,10 @@
dev_priv->saveIMR = I915_READ(IMR);
}
- if (HAS_PCH_SPLIT(dev))
+ if (IS_IRONLAKE_M(dev))
ironlake_disable_drps(dev);
+ if (IS_GEN6(dev))
+ gen6_disable_rps(dev);
intel_disable_clock_gating(dev);
@@ -867,11 +869,14 @@
/* Clock gating state */
intel_enable_clock_gating(dev);
- if (HAS_PCH_SPLIT(dev)) {
+ if (IS_IRONLAKE_M(dev)) {
ironlake_enable_drps(dev);
intel_init_emon(dev);
}
+ if (IS_GEN6(dev))
+ gen6_enable_rps(dev_priv);
+
/* Cache mode state */
I915_WRITE (CACHE_MODE_0, dev_priv->saveCACHE_MODE_0 | 0xffff0000);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index c79bee4..8806596 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6021,6 +6021,25 @@
}
+void gen6_set_rps(struct drm_device *dev, u8 val)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ u32 swreq;
+
+ swreq = (val & 0x3ff) << 25;
+ I915_WRITE(GEN6_RPNSWREQ, swreq);
+}
+
+void gen6_disable_rps(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ I915_WRITE(GEN6_RPNSWREQ, 1 << 31);
+ I915_WRITE(GEN6_PMINTRMSK, 0xffffffff);
+ I915_WRITE(GEN6_PMIER, 0);
+ I915_WRITE(GEN6_PMIIR, I915_READ(GEN6_PMIIR));
+}
+
static unsigned long intel_pxfreq(u32 vidfreq)
{
unsigned long freq;
@@ -6107,7 +6126,7 @@
dev_priv->corr = (lcfuse & LCFUSE_HIV_MASK);
}
-static void gen6_enable_rc6(struct drm_i915_private *dev_priv)
+void gen6_enable_rps(struct drm_i915_private *dev_priv)
{
int i;
@@ -6120,7 +6139,7 @@
I915_WRITE(GEN6_RC_STATE, 0);
__gen6_force_wake_get(dev_priv);
- /* disable the counters and set determistic thresholds */
+ /* disable the counters and set deterministic thresholds */
I915_WRITE(GEN6_RC_CONTROL, 0);
I915_WRITE(GEN6_RC1_WAKE_RATE_LIMIT, 1000 << 16);
@@ -6144,7 +6163,7 @@
GEN6_RC_CTL_EI_MODE(1) |
GEN6_RC_CTL_HW_ENABLE);
- I915_WRITE(GEN6_RC_NORMAL_FREQ,
+ I915_WRITE(GEN6_RPNSWREQ,
GEN6_FREQUENCY(10) |
GEN6_OFFSET(0) |
GEN6_AGGRESSIVE_TURBO);
@@ -6189,6 +6208,9 @@
GEN6_PM_RP_DOWN_THRESHOLD |
GEN6_PM_RP_UP_EI_EXPIRED |
GEN6_PM_RP_DOWN_EI_EXPIRED);
+ I915_WRITE(GEN6_PMIMR, 0);
+ /* enable all PM interrupts */
+ I915_WRITE(GEN6_PMINTRMSK, 0);
__gen6_force_wake_put(dev_priv);
}
@@ -6381,9 +6403,6 @@
I915_READ(MCHBAR_RENDER_STANDBY) & ~RCX_SW_EXIT);
}
}
-
- if (IS_GEN6(dev))
- gen6_enable_rc6(dev_priv);
}
void intel_disable_clock_gating(struct drm_device *dev)
@@ -6657,6 +6676,9 @@
intel_init_emon(dev);
}
+ if (IS_GEN6(dev))
+ gen6_enable_rps(dev_priv);
+
INIT_WORK(&dev_priv->idle_work, intel_idle_update);
setup_timer(&dev_priv->idle_timer, intel_gpu_idle_timer,
(unsigned long)dev);
@@ -6690,6 +6712,8 @@
if (IS_IRONLAKE_M(dev))
ironlake_disable_drps(dev);
+ if (IS_GEN6(dev))
+ gen6_disable_rps(dev);
intel_disable_clock_gating(dev);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index acdea65..d782ad9 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -298,6 +298,8 @@
extern void intel_disable_clock_gating(struct drm_device *dev);
extern void ironlake_enable_drps(struct drm_device *dev);
extern void ironlake_disable_drps(struct drm_device *dev);
+extern void gen6_enable_rps(struct drm_i915_private *dev_priv);
+extern void gen6_disable_rps(struct drm_device *dev);
extern void intel_init_emon(struct drm_device *dev);
extern int intel_pin_and_fence_fb_obj(struct drm_device *dev,