[Intel-gfx] [RFC] drm/i915/vlv: allocate Gunit s0ix state on demand

[Jani Nikula]

Valleyview is the only platform that requires the Gunit s0ix save
state. Allocate it dynamically instead of burdening all platforms with
it in drm_i915_private.

Cc: Imre Deak <imre.deak at intel.com>
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 79 ++++++++++++++++++++++++++++++++-
 drivers/gpu/drm/i915/i915_drv.h | 64 +-------------------------
 2 files changed, 79 insertions(+), 64 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index efe904626bf5..c1483cd8e76c 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -2559,11 +2559,81 @@ static int i915_pm_restore(struct device *kdev)
  * a black-box for the driver. Further investigation is needed to reduce the
  * saved/restored registers even further, by following the same 3 criteria.
  */
+
+struct vlv_s0ix_state {
+	/* GAM */
+	u32 wr_watermark;
+	u32 gfx_prio_ctrl;
+	u32 arb_mode;
+	u32 gfx_pend_tlb0;
+	u32 gfx_pend_tlb1;
+	u32 lra_limits[GEN7_LRA_LIMITS_REG_NUM];
+	u32 media_max_req_count;
+	u32 gfx_max_req_count;
+	u32 render_hwsp;
+	u32 ecochk;
+	u32 bsd_hwsp;
+	u32 blt_hwsp;
+	u32 tlb_rd_addr;
+
+	/* MBC */
+	u32 g3dctl;
+	u32 gsckgctl;
+	u32 mbctl;
+
+	/* GCP */
+	u32 ucgctl1;
+	u32 ucgctl3;
+	u32 rcgctl1;
+	u32 rcgctl2;
+	u32 rstctl;
+	u32 misccpctl;
+
+	/* GPM */
+	u32 gfxpause;
+	u32 rpdeuhwtc;
+	u32 rpdeuc;
+	u32 ecobus;
+	u32 pwrdwnupctl;
+	u32 rp_down_timeout;
+	u32 rp_deucsw;
+	u32 rcubmabdtmr;
+	u32 rcedata;
+	u32 spare2gh;
+
+	/* Display 1 CZ domain */
+	u32 gt_imr;
+	u32 gt_ier;
+	u32 pm_imr;
+	u32 pm_ier;
+	u32 gt_scratch[GEN7_GT_SCRATCH_REG_NUM];
+
+	/* GT SA CZ domain */
+	u32 tilectl;
+	u32 gt_fifoctl;
+	u32 gtlc_wake_ctrl;
+	u32 gtlc_survive;
+	u32 pmwgicz;
+
+	/* Display 2 CZ domain */
+	u32 gu_ctl0;
+	u32 gu_ctl1;
+	u32 pcbr;
+	u32 clock_gate_dis2;
+};
+
 static void vlv_save_gunit_s0ix_state(struct drm_i915_private *dev_priv)
 {
-	struct vlv_s0ix_state *s = &dev_priv->vlv_s0ix_state;
+	struct vlv_s0ix_state *s = dev_priv->vlv_s0ix_state;
 	int i;
 
+	if (!s) {
+		s = devm_kmalloc(dev_priv->drm.dev, sizeof(*s), GFP_KERNEL);
+		if (!s)
+			return;
+		dev_priv->vlv_s0ix_state = s;
+	}
+
 	/* GAM 0x4000-0x4770 */
 	s->wr_watermark		= I915_READ(GEN7_WR_WATERMARK);
 	s->gfx_prio_ctrl	= I915_READ(GEN7_GFX_PRIO_CTRL);
@@ -2642,10 +2712,15 @@ static void vlv_save_gunit_s0ix_state(struct drm_i915_private *dev_priv)
 
 static void vlv_restore_gunit_s0ix_state(struct drm_i915_private *dev_priv)
 {
-	struct vlv_s0ix_state *s = &dev_priv->vlv_s0ix_state;
+	struct vlv_s0ix_state *s = dev_priv->vlv_s0ix_state;
 	u32 val;
 	int i;
 
+	if (!s) {
+		DRM_DEBUG_KMS("gunit restore without save state\n");
+		return;
+	}
+
 	/* GAM 0x4000-0x4770 */
 	I915_WRITE(GEN7_WR_WATERMARK,	s->wr_watermark);
 	I915_WRITE(GEN7_GFX_PRIO_CTRL,	s->gfx_prio_ctrl);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 7d424ddd3523..30e33103b845 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -580,67 +580,7 @@ struct i915_suspend_saved_registers {
 	u16 saveGCDGMBUS;
 };
 
-struct vlv_s0ix_state {
-	/* GAM */
-	u32 wr_watermark;
-	u32 gfx_prio_ctrl;
-	u32 arb_mode;
-	u32 gfx_pend_tlb0;
-	u32 gfx_pend_tlb1;
-	u32 lra_limits[GEN7_LRA_LIMITS_REG_NUM];
-	u32 media_max_req_count;
-	u32 gfx_max_req_count;
-	u32 render_hwsp;
-	u32 ecochk;
-	u32 bsd_hwsp;
-	u32 blt_hwsp;
-	u32 tlb_rd_addr;
-
-	/* MBC */
-	u32 g3dctl;
-	u32 gsckgctl;
-	u32 mbctl;
-
-	/* GCP */
-	u32 ucgctl1;
-	u32 ucgctl3;
-	u32 rcgctl1;
-	u32 rcgctl2;
-	u32 rstctl;
-	u32 misccpctl;
-
-	/* GPM */
-	u32 gfxpause;
-	u32 rpdeuhwtc;
-	u32 rpdeuc;
-	u32 ecobus;
-	u32 pwrdwnupctl;
-	u32 rp_down_timeout;
-	u32 rp_deucsw;
-	u32 rcubmabdtmr;
-	u32 rcedata;
-	u32 spare2gh;
-
-	/* Display 1 CZ domain */
-	u32 gt_imr;
-	u32 gt_ier;
-	u32 pm_imr;
-	u32 pm_ier;
-	u32 gt_scratch[GEN7_GT_SCRATCH_REG_NUM];
-
-	/* GT SA CZ domain */
-	u32 tilectl;
-	u32 gt_fifoctl;
-	u32 gtlc_wake_ctrl;
-	u32 gtlc_survive;
-	u32 pmwgicz;
-
-	/* Display 2 CZ domain */
-	u32 gu_ctl0;
-	u32 gu_ctl1;
-	u32 pcbr;
-	u32 clock_gate_dis2;
-};
+struct vlv_s0ix_state;
 
 struct intel_rps_ei {
 	ktime_t ktime;
@@ -1601,7 +1541,7 @@ struct drm_i915_private {
 	u32 suspend_count;
 	bool power_domains_suspended;
 	struct i915_suspend_saved_registers regfile;
-	struct vlv_s0ix_state vlv_s0ix_state;
+	struct vlv_s0ix_state *vlv_s0ix_state;
 
 	enum {
 		I915_SAGV_UNKNOWN = 0,
-- 
2.20.1