[PATCH 4/4] drm/i915: BIOS and power context stolen mem handling for VLV

[Jesse Barnes <jbarnes@virtuousgeek.org>]

But we need to get the right stolen base and make pre-allocated objects
for BIOS stuff so we don't clobber it.  If the BIOS hasn't allocated a
power context, we allocate one here too, from stolen space as required
by the docs.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---
 drivers/gpu/drm/i915/i915_drv.h        |    2 +
 drivers/gpu/drm/i915/i915_gem_stolen.c |   78 +++++++++++++++++++++++++++++++-
 drivers/gpu/drm/i915/i915_reg.h        |    1 +
 3 files changed, 80 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 3ac71db..5e9ea36 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1055,6 +1055,8 @@ typedef struct drm_i915_private {
 
 	struct i915_gpu_error gpu_error;
 
+	struct drm_i915_gem_object *vlv_pctx;
+
 	/* list of fbdev register on this device */
 	struct intel_fbdev *fbdev;
 
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index 67d3510..c06056a 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -62,7 +62,10 @@ static unsigned long i915_stolen_to_physical(struct drm_device *dev)
 	 * its value of TOLUD.
 	 */
 	base = 0;
-	if (INTEL_INFO(dev)->gen >= 6) {
+	if (IS_VALLEYVIEW(dev)) {
+		pci_read_config_dword(pdev, 0x5c, &base);
+		base &= ((1<<19) - 1);
+	} if (INTEL_INFO(dev)->gen >= 6) {
 		/* Read Base Data of Stolen Memory Register (BDSM) directly.
 		 * Note that there is also a MCHBAR miror at 0x1080c0 or
 		 * we could use device 2:0x5c instead.
@@ -172,14 +175,82 @@ void i915_gem_stolen_cleanup_compression(struct drm_device *dev)
 	dev_priv->cfb_size = 0;
 }
 
+static void valleyview_setup_pctx(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct drm_i915_gem_object *pctx;
+	unsigned long pctx_paddr;
+	u32 pcbr;
+	int pctx_size = 24*1024;
+
+	pcbr = I915_READ(VLV_PCBR);
+	if (pcbr) {
+		/* BIOS set it up already, grab the pre-alloc'd space */
+		int pcbr_offset;
+
+		pcbr_offset = (pcbr & (~4095)) - dev_priv->mm.stolen_base;
+		pctx = i915_gem_object_create_stolen_for_preallocated(dev_priv->dev,
+								      pcbr_offset,
+								      pcbr_offset,
+								      pctx_size);
+		/* We don't need to track it since we don't own it */
+		return;
+	}
+
+	/*
+	 * From the Gunit register HAS:
+	 * The Gfx driver is expected to program this register and ensure
+	 * proper allocation within Gfx stolen memory.  For example, this
+	 * register should be programmed such than the PCBR range does not
+	 * overlap with other ranges, such as the frame buffer, protected
+	 * memory, or any other relevant ranges.
+	 */
+	pctx = i915_gem_object_create_stolen(dev, pctx_size);
+	if (!pctx) {
+		DRM_DEBUG("not enough stolen space for PCTX, disabling\n");
+		return;
+	}
+
+	dev_priv->vlv_pctx = pctx;
+	pctx_paddr = dev_priv->mm.stolen_base + pctx->stolen->start;
+	I915_WRITE(VLV_PCBR, pctx_paddr);
+}
+
+static void valleyview_cleanup_pctx(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+
+	if (!dev_priv->vlv_pctx)
+		return;
+
+	i915_gem_object_release_stolen(dev_priv->vlv_pctx);
+	I915_WRITE(VLV_PCBR, 0);
+}
+
 void i915_gem_cleanup_stolen(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
 	i915_gem_stolen_cleanup_compression(dev);
+	if (IS_VALLEYVIEW(dev))
+		valleyview_cleanup_pctx(dev);
 	drm_mm_takedown(&dev_priv->mm.stolen);
 }
 
+/* On VLV make sure we create pre-alloc'd objects for BIOS bits */
+static void valleyview_init_bios_stolen(struct drm_i915_private *dev_priv)
+{
+	struct drm_i915_gem_object *bios_stolen;
+	int bios_offset;
+
+	/* Top 1M of stolen space is used by firmware */
+	bios_offset = dev_priv->gtt.stolen_size - 1024*1024;
+	bios_stolen = i915_gem_object_create_stolen_for_preallocated(dev_priv->dev,
+								     bios_offset,
+								     bios_offset,
+								     1024*1024);
+}
+
 int i915_gem_init_stolen(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -194,6 +265,11 @@ int i915_gem_init_stolen(struct drm_device *dev)
 	/* Basic memrange allocator for stolen space */
 	drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size);
 
+	if (IS_VALLEYVIEW(dev)) {
+		valleyview_init_bios_stolen(dev_priv);
+		valleyview_setup_pctx(dev);
+	}
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index b5d87bd..1cc43ce 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -700,6 +700,7 @@
 #define VLV_IIR		(VLV_DISPLAY_BASE + 0x20a4)
 #define VLV_IMR		(VLV_DISPLAY_BASE + 0x20a8)
 #define VLV_ISR		(VLV_DISPLAY_BASE + 0x20ac)
+#define VLV_PCBR	(VLV_DISPLAY_BASE + 0x2120)
 #define   I915_PIPE_CONTROL_NOTIFY_INTERRUPT		(1<<18)
 #define   I915_DISPLAY_PORT_INTERRUPT			(1<<17)
 #define   I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT	(1<<15)
-- 
1.7.10.4