From f7180349fde6947e229ecde17215c2984e6e883b Mon Sep 17 00:00:00 2001
From: Zou Nan hai <nanhai.zou@intel.com>
Date: Mon, 4 Dec 2006 15:48:04 +0800
Subject: i915: ARB_Occlusion_query(MMIO ioctl) support.

This adds a new ioctl for passing counter information from the chip back to
applications, these counters include the data needed to perform OC.
---
 shared-core/i915_dma.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++
 shared-core/i915_drm.h | 29 ++++++++++++++++++++++++++
 2 files changed, 85 insertions(+)

diff --git a/shared-core/i915_dma.c b/shared-core/i915_dma.c
index 3373f1b0..943a1772 100644
--- a/shared-core/i915_dma.c
+++ b/shared-core/i915_dma.c
@@ -775,6 +775,61 @@ static int i915_setparam(DRM_IOCTL_ARGS)
 	return 0;
 }
 
+drm_i915_mmio_entry_t mmio_table[] = {
+	[MMIO_REGS_PS_DEPTH_COUNT] = {
+		I915_MMIO_MAY_READ|I915_MMIO_MAY_WRITE,
+		0x2350,
+		8
+	}	
+};
+
+static int mmio_table_size = sizeof(mmio_table)/sizeof(drm_i915_mmio_entry_t);
+
+static int i915_mmio(DRM_IOCTL_ARGS)
+{
+	char buf[32];
+	DRM_DEVICE;
+	drm_i915_private_t *dev_priv = dev->dev_private;
+	drm_i915_mmio_entry_t *e;	 
+	drm_i915_mmio_t mmio;
+	void __iomem *base;
+	if (!dev_priv) {
+		DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
+		return DRM_ERR(EINVAL);
+	}
+	DRM_COPY_FROM_USER_IOCTL(mmio, (drm_i915_setparam_t __user *) data,
+				 sizeof(mmio));
+
+	if (mmio.reg >= mmio_table_size)
+		return DRM_ERR(EINVAL);
+
+	e = &mmio_table[mmio.reg];
+	base = dev_priv->mmio_map->handle + e->offset;
+
+        switch (mmio.read_write) {
+		case I915_MMIO_READ:
+			if (!(e->flag & I915_MMIO_MAY_READ))
+				return DRM_ERR(EINVAL);
+			memcpy_fromio(buf, base, e->size);
+			if (DRM_COPY_TO_USER(mmio.data, buf, e->size)) {
+				DRM_ERROR("DRM_COPY_TO_USER failed\n");
+				return DRM_ERR(EFAULT);
+			}
+			break;
+
+		case I915_MMIO_WRITE:
+			if (!(e->flag & I915_MMIO_MAY_WRITE))
+				return DRM_ERR(EINVAL);
+			if(DRM_COPY_FROM_USER(buf, mmio.data, e->size)) {
+				DRM_ERROR("DRM_COPY_TO_USER failed\n");
+				return DRM_ERR(EFAULT);
+			}
+			memcpy_toio(base, buf, e->size);
+			break;
+	}
+	return 0;
+}
+
 int i915_driver_load(drm_device_t *dev, unsigned long flags)
 {
 	/* i915 has 4 more counters */
@@ -824,6 +879,7 @@ drm_ioctl_desc_t i915_ioctls[] = {
 	[DRM_IOCTL_NR(DRM_I915_SET_VBLANK_PIPE)] = { i915_vblank_pipe_set, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY },
 	[DRM_IOCTL_NR(DRM_I915_GET_VBLANK_PIPE)] = { i915_vblank_pipe_get, DRM_AUTH },
 	[DRM_IOCTL_NR(DRM_I915_VBLANK_SWAP)] = {i915_vblank_swap, DRM_AUTH},
+	[DRM_IOCTL_NR(DRM_I915_MMIO)] = {i915_mmio, DRM_AUTH},
 };
 
 int i915_max_ioctl = DRM_ARRAY_SIZE(i915_ioctls);
diff --git a/shared-core/i915_drm.h b/shared-core/i915_drm.h
index 9eec109e..22a81d14 100644
--- a/shared-core/i915_drm.h
+++ b/shared-core/i915_drm.h
@@ -152,6 +152,7 @@ typedef struct _drm_i915_sarea {
 #define DRM_I915_SET_VBLANK_PIPE	0x0d
 #define DRM_I915_GET_VBLANK_PIPE	0x0e
 #define DRM_I915_VBLANK_SWAP	0x0f
+#define DRM_I915_MMIO		0x10
 
 #define DRM_IOCTL_I915_INIT		DRM_IOW( DRM_COMMAND_BASE + DRM_I915_INIT, drm_i915_init_t)
 #define DRM_IOCTL_I915_FLUSH		DRM_IO ( DRM_COMMAND_BASE + DRM_I915_FLUSH)
@@ -273,4 +274,32 @@ typedef struct drm_i915_vblank_swap {
 	unsigned int sequence;
 } drm_i915_vblank_swap_t;
 
+#define I915_MMIO_READ 	0
+#define I915_MMIO_WRITE 1
+
+#define I915_MMIO_MAY_READ  	0x1
+#define I915_MMIO_MAY_WRITE  	0x2
+
+#define MMIO_REGS_IA_PRIMATIVES_COUNT		0
+#define MMIO_REGS_IA_VERTICES_COUNT		1
+#define MMIO_REGS_VS_INVOCATION_COUNT		2
+#define MMIO_REGS_GS_PRIMITIVES_COUNT		3
+#define MMIO_REGS_GS_INVOCATION_COUNT		4
+#define MMIO_REGS_CL_PRIMITIVES_COUNT		5
+#define MMIO_REGS_CL_INVOCATION_COUNT		6
+#define MMIO_REGS_PS_INVOCATION_COUNT		7
+#define MMIO_REGS_PS_DEPTH_COUNT		8
+
+typedef struct drm_i915_mmio_entry {
+	unsigned int flag;
+	unsigned int offset;
+	unsigned int size;
+}drm_i915_mmio_entry_t;
+
+typedef struct drm_i915_mmio {
+	unsigned int read_write:1;
+	unsigned int reg:31;
+	void __user *data;	
+} drm_i915_mmio_t;
+
 #endif				/* _I915_DRM_H_ */
-- 
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