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-rw-r--r--linux-core/Makefile.kernel3
-rw-r--r--linux-core/i915_gem.c15
-rw-r--r--linux-core/i915_gem_tiling.c290
-rw-r--r--shared-core/i915_dma.c10
-rw-r--r--shared-core/i915_drm.h64
-rw-r--r--shared-core/i915_drv.h29
6 files changed, 403 insertions, 8 deletions
diff --git a/linux-core/Makefile.kernel b/linux-core/Makefile.kernel
index 82d200b3..abfad0a1 100644
--- a/linux-core/Makefile.kernel
+++ b/linux-core/Makefile.kernel
@@ -20,7 +20,8 @@ r128-objs := r128_drv.o r128_cce.o r128_state.o r128_irq.o
mga-objs := mga_drv.o mga_dma.o mga_state.o mga_warp.o mga_irq.o
i810-objs := i810_drv.o i810_dma.o
i915-objs := i915_drv.o i915_dma.o i915_irq.o i915_mem.o i915_fence.o \
- i915_buffer.o i915_compat.o i915_execbuf.o i915_gem.o
+ i915_buffer.o i915_compat.o i915_execbuf.o \
+ i915_gem.o i915_gem_tiling.o
nouveau-objs := nouveau_drv.o nouveau_state.o nouveau_fifo.o nouveau_mem.o \
nouveau_object.o nouveau_irq.o nouveau_notifier.o nouveau_swmthd.o \
nouveau_sgdma.o nouveau_dma.o nouveau_bo.o nouveau_fence.o \
diff --git a/linux-core/i915_gem.c b/linux-core/i915_gem.c
index 446c9ba9..236203a5 100644
--- a/linux-core/i915_gem.c
+++ b/linux-core/i915_gem.c
@@ -2702,3 +2702,18 @@ i915_gem_lastclose(struct drm_device *dev)
mutex_unlock(&dev->struct_mutex);
}
+
+void i915_gem_load(struct drm_device *dev)
+{
+ drm_i915_private_t *dev_priv = dev->dev_private;
+
+ INIT_LIST_HEAD(&dev_priv->mm.active_list);
+ INIT_LIST_HEAD(&dev_priv->mm.flushing_list);
+ INIT_LIST_HEAD(&dev_priv->mm.inactive_list);
+ INIT_LIST_HEAD(&dev_priv->mm.request_list);
+ INIT_DELAYED_WORK(&dev_priv->mm.retire_work,
+ i915_gem_retire_work_handler);
+ dev_priv->mm.next_gem_seqno = 1;
+
+ i915_gem_detect_bit_6_swizzle(dev);
+}
diff --git a/linux-core/i915_gem_tiling.c b/linux-core/i915_gem_tiling.c
new file mode 100644
index 00000000..d66276d6
--- /dev/null
+++ b/linux-core/i915_gem_tiling.c
@@ -0,0 +1,290 @@
+/*
+ * Copyright © 2008 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ * Eric Anholt <eric@anholt.net>
+ *
+ */
+
+#include "drmP.h"
+#include "drm.h"
+#include "i915_drm.h"
+#include "i915_drv.h"
+
+/** @file i915_gem_tiling.c
+ *
+ * Support for managing tiling state of buffer objects.
+ *
+ * The idea behind tiling is to increase cache hit rates by rearranging
+ * pixel data so that a group of pixel accesses are in the same cacheline.
+ * Performance improvement from doing this on the back/depth buffer are on
+ * the order of 30%.
+ *
+ * Intel architectures make this somewhat more complicated, though, by
+ * adjustments made to addressing of data when the memory is in interleaved
+ * mode (matched pairs of DIMMS) to improve memory bandwidth.
+ * For interleaved memory, the CPU sends every sequential 64 bytes
+ * to an alternate memory channel so it can get the bandwidth from both.
+ *
+ * The GPU also rearranges its accesses for increased bandwidth to interleaved
+ * memory, and it matches what the CPU does for non-tiled. However, when tiled
+ * it does it a little differently, since one walks addresses not just in the
+ * X direction but also Y. So, along with alternating channels when bit
+ * 6 of the address flips, it also alternates when other bits flip -- Bits 9
+ * (every 512 bytes, an X tile scanline) and 10 (every two X tile scanlines)
+ * are common to both the 915 and 965-class hardware.
+ *
+ * The CPU also sometimes XORs in higher bits as well, to improve
+ * bandwidth doing strided access like we do so frequently in graphics. This
+ * is called "Channel XOR Randomization" in the MCH documentation. The result
+ * is that the CPU is XORing in either bit 11 or bit 17 to bit 6 of its address
+ * decode.
+ *
+ * All of this bit 6 XORing has an effect on our memory management,
+ * as we need to make sure that the 3d driver can correctly address object
+ * contents.
+ *
+ * If we don't have interleaved memory, all tiling is safe and no swizzling is
+ * required.
+ *
+ * When bit 17 is XORed in, we simply refuse to tile at all. Bit
+ * 17 is not just a page offset, so as we page an objet out and back in,
+ * individual pages in it will have different bit 17 addresses, resulting in
+ * each 64 bytes being swapped with its neighbor!
+ *
+ * Otherwise, if interleaved, we have to tell the 3d driver what the address
+ * swizzling it needs to do is, since it's writing with the CPU to the pages
+ * (bit 6 and potentially bit 11 XORed in), and the GPU is reading from the
+ * pages (bit 6, 9, and 10 XORed in), resulting in a cumulative bit swizzling
+ * required by the CPU of XORing in bit 6, 9, 10, and potentially 11, in order
+ * to match what the GPU expects.
+ */
+
+/**
+ * Detects bit 6 swizzling of address lookup between IGD access and CPU
+ * access through main memory.
+ */
+void
+i915_gem_detect_bit_6_swizzle(struct drm_device *dev)
+{
+ drm_i915_private_t *dev_priv = dev->dev_private;
+ struct pci_dev *bridge;
+ uint32_t swizzle_x = I915_BIT_6_SWIZZLE_UNKNOWN;
+ uint32_t swizzle_y = I915_BIT_6_SWIZZLE_UNKNOWN;
+ int mchbar_offset;
+ volatile char *mchbar;
+ int ret;
+
+ bridge = pci_get_bus_and_slot(0, PCI_DEVFN(0,0));
+ if (bridge == NULL) {
+ DRM_ERROR("Couldn't get bridge device\n");
+ return;
+ }
+
+ ret = pci_enable_device(bridge);
+ if (ret != 0) {
+ DRM_ERROR("pci_enable_device failed: %d\n", ret);
+ return;
+ }
+
+ if (IS_I965G(dev))
+ mchbar_offset = 0x48;
+ else
+ mchbar_offset = 0x44;
+
+ /* Use resource 2 for our BAR that's stashed in a nonstandard location,
+ * since the bridge would only ever use standard BARs 0-1 (though it
+ * doesn't anyway)
+ */
+ pci_read_base(bridge, mchbar_offset, &bridge->resource[2]);
+
+ mchbar = ioremap(pci_resource_start(bridge, 2),
+ pci_resource_len(bridge, 2));
+ if (mchbar == NULL) {
+ DRM_ERROR("Couldn't map MCHBAR to determine tile swizzling\n");
+ return;
+ }
+
+ if (IS_I965G(dev) && !IS_I965GM(dev)) {
+ uint32_t chdecmisc;
+
+ /* On the 965, channel interleave appears to be determined by
+ * the flex bit. If flex is set, then the ranks (sides of a
+ * DIMM) of memory will be "stacked" (physical addresses walk
+ * through one rank then move on to the next, flipping channels
+ * or not depending on rank configuration). The GPU in this
+ * case does exactly the same addressing as the CPU.
+ *
+ * Unlike the 945, channel randomization based does not
+ * appear to be available.
+ *
+ * XXX: While the G965 doesn't appear to do any interleaving
+ * when the DIMMs are not exactly matched, the G4x chipsets
+ * might be for "L-shaped" configurations, and will need to be
+ * detected.
+ *
+ * L-shaped configuration:
+ *
+ * +-----+
+ * | |
+ * |DIMM2| <-- non-interleaved
+ * +-----+
+ * +-----+ +-----+
+ * | | | |
+ * |DIMM0| |DIMM1| <-- interleaved area
+ * +-----+ +-----+
+ */
+ chdecmisc = readb(mchbar + CHDECMISC);
+
+ if (chdecmisc & CHDECMISC_FLEXMEMORY) {
+ swizzle_x = I915_BIT_6_SWIZZLE_NONE;
+ swizzle_y = I915_BIT_6_SWIZZLE_NONE;
+ } else {
+ swizzle_x = I915_BIT_6_SWIZZLE_9_10;
+ swizzle_y = I915_BIT_6_SWIZZLE_9;
+ }
+ } else if (IS_I9XX(dev)){
+ uint32_t dcc;
+
+ /* On 915-945 and GM965, channel interleave by the CPU is
+ * determined by DCC. The CPU will alternate based on bit 6
+ * in interleaved mode, and the GPU will then also alternate
+ * on bit 6, 9, and 10 for X, but the CPU may also optionally
+ * alternate based on bit 17 (XOR not disabled and XOR
+ * bit == 17).
+ */
+ dcc = readl(mchbar + DCC);
+ switch (dcc & DCC_ADDRESSING_MODE_MASK) {
+ case DCC_ADDRESSING_MODE_SINGLE_CHANNEL:
+ case DCC_ADDRESSING_MODE_DUAL_CHANNEL_ASYMMETRIC:
+ swizzle_x = I915_BIT_6_SWIZZLE_NONE;
+ swizzle_y = I915_BIT_6_SWIZZLE_NONE;
+ break;
+ case DCC_ADDRESSING_MODE_DUAL_CHANNEL_INTERLEAVED:
+ if (IS_I915G(dev) || IS_I915GM(dev) ||
+ dcc & DCC_CHANNEL_XOR_DISABLE) {
+ swizzle_x = I915_BIT_6_SWIZZLE_9_10;
+ swizzle_y = I915_BIT_6_SWIZZLE_9;
+ } else if (IS_I965GM(dev)) {
+ /* GM965 only does bit 11-based channel
+ * randomization
+ */
+ swizzle_x = I915_BIT_6_SWIZZLE_9_10_11;
+ swizzle_y = I915_BIT_6_SWIZZLE_9_11;
+ } else {
+ /* Bit 17 or perhaps other swizzling */
+ swizzle_x = I915_BIT_6_SWIZZLE_UNKNOWN;
+ swizzle_y = I915_BIT_6_SWIZZLE_UNKNOWN;
+ }
+ break;
+ }
+ }
+
+ iounmap(mchbar);
+
+ dev_priv->mm.bit_6_swizzle_x = swizzle_x;
+ dev_priv->mm.bit_6_swizzle_y = swizzle_y;
+}
+
+/**
+ * Sets the tiling mode of an object, returning the required swizzling of
+ * bit 6 of addresses in the object.
+ */
+int
+i915_gem_set_tiling(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_i915_gem_set_tiling *args = data;
+ drm_i915_private_t *dev_priv = dev->dev_private;
+ struct drm_gem_object *obj;
+ struct drm_i915_gem_object *obj_priv;
+
+ obj = drm_gem_object_lookup(dev, file_priv, args->handle);
+ if (obj == NULL)
+ return -EINVAL;
+ obj_priv = obj->driver_private;
+
+ mutex_lock(&dev->struct_mutex);
+
+ if (args->tiling_mode == I915_TILING_NONE) {
+ obj_priv->tiling_mode = I915_TILING_NONE;
+ args->swizzle_mode = I915_BIT_6_SWIZZLE_NONE;
+ } else {
+ if (args->tiling_mode == I915_TILING_X)
+ args->swizzle_mode = dev_priv->mm.bit_6_swizzle_x;
+ else
+ args->swizzle_mode = dev_priv->mm.bit_6_swizzle_y;
+ /* If we can't handle the swizzling, make it untiled. */
+ if (args->swizzle_mode == I915_BIT_6_SWIZZLE_UNKNOWN) {
+ args->tiling_mode = I915_TILING_NONE;
+ args->swizzle_mode = I915_BIT_6_SWIZZLE_NONE;
+ }
+ }
+ obj_priv->tiling_mode = args->tiling_mode;
+
+ mutex_unlock(&dev->struct_mutex);
+
+ drm_gem_object_unreference(obj);
+
+ return 0;
+}
+
+/**
+ * Returns the current tiling mode and required bit 6 swizzling for the object.
+ */
+int
+i915_gem_get_tiling(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_i915_gem_get_tiling *args = data;
+ drm_i915_private_t *dev_priv = dev->dev_private;
+ struct drm_gem_object *obj;
+ struct drm_i915_gem_object *obj_priv;
+
+ obj = drm_gem_object_lookup(dev, file_priv, args->handle);
+ if (obj == NULL)
+ return -EINVAL;
+ obj_priv = obj->driver_private;
+
+ mutex_lock(&dev->struct_mutex);
+
+ args->tiling_mode = obj_priv->tiling_mode;
+ switch (obj_priv->tiling_mode) {
+ case I915_TILING_X:
+ args->swizzle_mode = dev_priv->mm.bit_6_swizzle_x;
+ break;
+ case I915_TILING_Y:
+ args->swizzle_mode = dev_priv->mm.bit_6_swizzle_y;
+ break;
+ case I915_TILING_NONE:
+ args->swizzle_mode = I915_BIT_6_SWIZZLE_NONE;
+ break;
+ default:
+ DRM_ERROR("unknown tiling mode\n");
+ }
+
+ mutex_unlock(&dev->struct_mutex);
+
+ drm_gem_object_unreference(obj);
+
+ return 0;
+}
diff --git a/shared-core/i915_dma.c b/shared-core/i915_dma.c
index 6ee3d19f..c9a9d800 100644
--- a/shared-core/i915_dma.c
+++ b/shared-core/i915_dma.c
@@ -1068,13 +1068,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
ret = drm_addmap(dev, base, size, _DRM_REGISTERS,
_DRM_KERNEL | _DRM_DRIVER, &dev_priv->mmio_map);
- INIT_LIST_HEAD(&dev_priv->mm.active_list);
- INIT_LIST_HEAD(&dev_priv->mm.flushing_list);
- INIT_LIST_HEAD(&dev_priv->mm.inactive_list);
- INIT_LIST_HEAD(&dev_priv->mm.request_list);
- INIT_DELAYED_WORK(&dev_priv->mm.retire_work,
- i915_gem_retire_work_handler);
- dev_priv->mm.next_gem_seqno = 1;
+ i915_gem_load(dev);
#ifdef __linux__
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
@@ -1217,6 +1211,8 @@ struct drm_ioctl_desc i915_ioctls[] = {
DRM_IOCTL_DEF(DRM_I915_GEM_MMAP, i915_gem_mmap_ioctl, 0),
DRM_IOCTL_DEF(DRM_I915_GEM_SET_DOMAIN, i915_gem_set_domain_ioctl, 0),
DRM_IOCTL_DEF(DRM_I915_GEM_SW_FINISH, i915_gem_sw_finish_ioctl, 0),
+ DRM_IOCTL_DEF(DRM_I915_GEM_SET_TILING, i915_gem_set_tiling, 0),
+ DRM_IOCTL_DEF(DRM_I915_GEM_GET_TILING, i915_gem_get_tiling, 0),
};
int i915_max_ioctl = DRM_ARRAY_SIZE(i915_ioctls);
diff --git a/shared-core/i915_drm.h b/shared-core/i915_drm.h
index fde474d7..9feffeb5 100644
--- a/shared-core/i915_drm.h
+++ b/shared-core/i915_drm.h
@@ -190,6 +190,8 @@ typedef struct drm_i915_sarea {
#define DRM_I915_GEM_MMAP 0x1e
#define DRM_I915_GEM_SET_DOMAIN 0x1f
#define DRM_I915_GEM_SW_FINISH 0x20
+#define DRM_I915_GEM_SET_TILING 0x21
+#define DRM_I915_GEM_GET_TILING 0x22
#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)
@@ -223,6 +225,8 @@ typedef struct drm_i915_sarea {
#define DRM_IOCTL_I915_GEM_MMAP DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_MMAP, struct drm_i915_gem_mmap)
#define DRM_IOCTL_I915_GEM_SET_DOMAIN DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_SET_DOMAIN, struct drm_i915_gem_set_domain)
#define DRM_IOCTL_I915_GEM_SW_FINISH DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_SW_FINISH, struct drm_i915_gem_sw_finish)
+#define DRM_IOCTL_I915_GEM_SET_TILING DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_SET_TILING, struct drm_i915_gem_set_tiling)
+#define DRM_IOCTL_I915_GEM_GET_TILING DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_GET_TILING, struct drm_i915_gem_get_tiling)
/* Asynchronous page flipping:
*/
@@ -651,4 +655,64 @@ struct drm_i915_gem_busy {
uint32_t busy;
};
+#define I915_TILING_NONE 0
+#define I915_TILING_X 1
+#define I915_TILING_Y 2
+
+#define I915_BIT_6_SWIZZLE_NONE 0
+#define I915_BIT_6_SWIZZLE_9 1
+#define I915_BIT_6_SWIZZLE_9_10 2
+#define I915_BIT_6_SWIZZLE_9_11 3
+#define I915_BIT_6_SWIZZLE_9_10_11 4
+/* Not seen by userland */
+#define I915_BIT_6_SWIZZLE_UNKNOWN 5
+
+struct drm_i915_gem_set_tiling {
+ /** Handle of the buffer to have its tiling state updated */
+ uint32_t handle;
+
+ /**
+ * Tiling mode for the object (I915_TILING_NONE, I915_TILING_X,
+ * I915_TILING_Y).
+ *
+ * This value is to be set on request, and will be updated by the
+ * kernel on successful return with the actual chosen tiling layout.
+ *
+ * The tiling mode may be demoted to I915_TILING_NONE when the system
+ * has bit 6 swizzling that can't be managed correctly by GEM.
+ *
+ * Buffer contents become undefined when changing tiling_mode.
+ */
+ uint32_t tiling_mode;
+
+ /**
+ * Stride in bytes for the object when in I915_TILING_X or
+ * I915_TILING_Y.
+ */
+ uint32_t stride;
+
+ /**
+ * Returned address bit 6 swizzling required for CPU access through
+ * mmap mapping.
+ */
+ uint32_t swizzle_mode;
+};
+
+struct drm_i915_gem_get_tiling {
+ /** Handle of the buffer to get tiling state for. */
+ uint32_t handle;
+
+ /**
+ * Current tiling mode for the object (I915_TILING_NONE, I915_TILING_X,
+ * I915_TILING_Y).
+ */
+ uint32_t tiling_mode;
+
+ /**
+ * Returned address bit 6 swizzling required for CPU access through
+ * mmap mapping.
+ */
+ uint32_t swizzle_mode;
+};
+
#endif /* _I915_DRM_H_ */
diff --git a/shared-core/i915_drv.h b/shared-core/i915_drv.h
index 0df5af9c..a9a431c4 100644
--- a/shared-core/i915_drv.h
+++ b/shared-core/i915_drv.h
@@ -316,6 +316,11 @@ typedef struct drm_i915_private {
* every pending request fail
*/
int wedged;
+
+ /** Bit 6 swizzling required for X tiling */
+ uint32_t bit_6_swizzle_x;
+ /** Bit 6 swizzling required for Y tiling */
+ uint32_t bit_6_swizzle_y;
} mm;
} drm_i915_private_t;
@@ -376,6 +381,9 @@ struct drm_i915_gem_object {
/** Breadcrumb of last rendering to the buffer. */
uint32_t last_rendering_seqno;
+
+ /** Current tiling mode for the object. */
+ uint32_t tiling_mode;
};
/**
@@ -517,6 +525,11 @@ int i915_gem_entervt_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
int i915_gem_leavevt_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
+int i915_gem_set_tiling(struct drm_device *dev, void *data,
+ struct drm_file *file_priv);
+int i915_gem_get_tiling(struct drm_device *dev, void *data,
+ struct drm_file *file_priv);
+void i915_gem_load(struct drm_device *dev);
int i915_gem_proc_init(struct drm_minor *minor);
void i915_gem_proc_cleanup(struct drm_minor *minor);
int i915_gem_init_object(struct drm_gem_object *obj);
@@ -529,6 +542,9 @@ void i915_gem_retire_requests(struct drm_device *dev);
void i915_gem_retire_work_handler(struct work_struct *work);
#endif
+/* i915_gem_tiling.c */
+void i915_gem_detect_bit_6_swizzle(struct drm_device *dev);
+
#ifdef __linux__
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
extern void intel_init_chipset_flush_compat(struct drm_device *dev);
@@ -585,6 +601,19 @@ void i915_ring_validate(struct drm_device *dev, const char *func, int line);
extern int i915_wait_ring(struct drm_device * dev, int n, const char *caller);
+/* MCH MMIO space */
+/** 915-945 and GM965 MCH register controlling DRAM channel access */
+#define DCC 0x200
+#define DCC_ADDRESSING_MODE_SINGLE_CHANNEL (0 << 0)
+#define DCC_ADDRESSING_MODE_DUAL_CHANNEL_ASYMMETRIC (1 << 0)
+#define DCC_ADDRESSING_MODE_DUAL_CHANNEL_INTERLEAVED (2 << 0)
+#define DCC_ADDRESSING_MODE_MASK (3 << 0)
+#define DCC_CHANNEL_XOR_DISABLE (1 << 10)
+
+/** 965 MCH register controlling DRAM channel configuration */
+#define CHDECMISC 0x111
+#define CHDECMISC_FLEXMEMORY (1 << 1)
+
/* Extended config space */
#define LBB 0xf4