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/*

 * 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 

 *

 */

#include 

#include 

#include 

#include 

#include "i915_drv.h"

/**

 * DOC: buffer object tiling

 *

 * i915_gem_set_tiling() and i915_gem_get_tiling() is the userspace interface to

 * declare fence register requirements.

 *

 * In principle GEM doesn't care at all about the internal data layout of an

 * object, and hence it also doesn't care about tiling or swizzling. There's two

 * exceptions:

 *

 * - For X and Y tiling the hardware provides detilers for CPU access, so called

 *   fences. Since there's only a limited amount of them the kernel must manage

 *   these, and therefore userspace must tell the kernel the object tiling if it

 *   wants to use fences for detiling.

 * - On gen3 and gen4 platforms have a swizzling pattern for tiled objects which

 *   depends upon the physical page frame number. When swapping such objects the

 *   page frame number might change and the kernel must be able to fix this up

 *   and hence now the tiling. Note that on a subset of platforms with

 *   asymmetric memory channel population the swizzling pattern changes in an

 *   unknown way, and for those the kernel simply forbids swapping completely.

 *

 * Since neither of this applies for new tiling layouts on modern platforms like

 * W, Ys and Yf tiling GEM only allows object tiling to be set to X or Y tiled.

 * Anything else can be handled in userspace entirely without the kernel's

 * invovlement.

 */

/* Check pitch constriants for all chips & tiling formats */

static bool

i915_tiling_ok(struct drm_device *dev, int stride, int size, int tiling_mode)

{

	int tile_width;

	/* Linear is always fine */

	if (tiling_mode == I915_TILING_NONE)

		return true;

	if (IS_GEN2(dev) ||

	    (tiling_mode == I915_TILING_Y && HAS_128_BYTE_Y_TILING(dev)))

		tile_width = 128;

	else

		tile_width = 512;

	/* check maximum stride & object size */

	/* i965+ stores the end address of the gtt mapping in the fence

	 * reg, so dont bother to check the size */

	if (INTEL_INFO(dev)->gen >= 7) {

		if (stride / 128 > GEN7_FENCE_MAX_PITCH_VAL)

			return false;

	} else if (INTEL_INFO(dev)->gen >= 4) {

		if (stride / 128 > I965_FENCE_MAX_PITCH_VAL)

			return false;

	} else {

		if (stride > 8192)

			return false;

		if (IS_GEN3(dev)) {

			if (size > I830_FENCE_MAX_SIZE_VAL << 20)

				return false;

		} else {

			if (size > I830_FENCE_MAX_SIZE_VAL << 19)

				return false;

		}

	}

	if (stride < tile_width)

		return false;

	/* 965+ just needs multiples of tile width */

	if (INTEL_INFO(dev)->gen >= 4) {

		if (stride & (tile_width - 1))

			return false;

		return true;

	}

	/* Pre-965 needs power of two tile widths */

	if (stride & (stride - 1))

		return false;

	return true;

}

/* Is the current GTT allocation valid for the change in tiling? */

static bool

i915_gem_object_fence_ok(struct drm_i915_gem_object *obj, int tiling_mode)

{

	u32 size;

	if (tiling_mode == I915_TILING_NONE)

		return true;

	if (INTEL_INFO(obj->base.dev)->gen >= 4)

		return true;

	if (INTEL_INFO(obj->base.dev)->gen == 3) {

		if (i915_gem_obj_ggtt_offset(obj) & ~I915_FENCE_START_MASK)

			return false;

	} else {

		if (i915_gem_obj_ggtt_offset(obj) & ~I830_FENCE_START_MASK)

			return false;

	}

	size = i915_gem_get_gtt_size(obj->base.dev, obj->base.size, tiling_mode);

	if (i915_gem_obj_ggtt_size(obj) != size)

		return false;

	if (i915_gem_obj_ggtt_offset(obj) & (size - 1))

		return false;

	return true;

}

/**

 * i915_gem_set_tiling - IOCTL handler to set tiling mode

 * @dev: DRM device

 * @data: data pointer for the ioctl

 * @file: DRM file for the ioctl call

 *

 * Sets the tiling mode of an object, returning the required swizzling of

 * bit 6 of addresses in the object.

 *

 * Called by the user via ioctl.

 *

 * Returns:

 * Zero on success, negative errno on failure.

 */

int

i915_gem_set_tiling(struct drm_device *dev, void *data,

		   struct drm_file *file)

{

	struct drm_i915_gem_set_tiling *args = data;

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct drm_i915_gem_object *obj;

	int ret = 0;

	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));

	if (&obj->base == NULL)

		return -ENOENT;

	if (!i915_tiling_ok(dev,

			    args->stride, obj->base.size, args->tiling_mode)) {

		drm_gem_object_unreference_unlocked(&obj->base);

		return -EINVAL;

	}

	mutex_lock(&dev->struct_mutex);

	if (obj->pin_display || obj->framebuffer_references) {

		ret = -EBUSY;

		goto err;

	}

	if (args->tiling_mode == I915_TILING_NONE) {

		args->swizzle_mode = I915_BIT_6_SWIZZLE_NONE;

		args->stride = 0;

	} 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;

		/* Hide bit 17 swizzling from the user.  This prevents old Mesa

		 * from aborting the application on sw fallbacks to bit 17,

		 * and we use the pread/pwrite bit17 paths to swizzle for it.

		 * If there was a user that was relying on the swizzle

		 * information for drm_intel_bo_map()ed reads/writes this would

		 * break it, but we don't have any of those.

		 */

		if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_17)

			args->swizzle_mode = I915_BIT_6_SWIZZLE_9;

		if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_10_17)

			args->swizzle_mode = I915_BIT_6_SWIZZLE_9_10;

		/* 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;

			args->stride = 0;

		}

	}

	if (args->tiling_mode != obj->tiling_mode ||

	    args->stride != obj->stride) {

		/* We need to rebind the object if its current allocation

		 * no longer meets the alignment restrictions for its new

		 * tiling mode. Otherwise we can just leave it alone, but

		 * need to ensure that any fence register is updated before

		 * the next fenced (either through the GTT or by the BLT unit

		 * on older GPUs) access.

		 *

		 * After updating the tiling parameters, we then flag whether

		 * we need to update an associated fence register. Note this

		 * has to also include the unfenced register the GPU uses

		 * whilst executing a fenced command for an untiled object.

		 */

		if (obj->map_and_fenceable &&

		    !i915_gem_object_fence_ok(obj, args->tiling_mode))

			ret = i915_gem_object_ggtt_unbind(obj);

		if (ret == 0) {

			if (obj->pages &&

			    obj->madv == I915_MADV_WILLNEED &&

			    dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES) {

				if (args->tiling_mode == I915_TILING_NONE)

					i915_gem_object_unpin_pages(obj);

				if (obj->tiling_mode == I915_TILING_NONE)

					i915_gem_object_pin_pages(obj);

			}

			obj->fence_dirty =

				obj->last_fenced_req ||

				obj->fence_reg != I915_FENCE_REG_NONE;

			obj->tiling_mode = args->tiling_mode;

			obj->stride = args->stride;

			/* Force the fence to be reacquired for GTT access */

			i915_gem_release_mmap(obj);

		}

	}

	/* we have to maintain this existing ABI... */

	args->stride = obj->stride;

	args->tiling_mode = obj->tiling_mode;

	/* Try to preallocate memory required to save swizzling on put-pages */

	if (i915_gem_object_needs_bit17_swizzle(obj)) {

		if (obj->bit_17 == NULL) {

			obj->bit_17 = kcalloc(BITS_TO_LONGS(obj->base.size >> PAGE_SHIFT),

					      sizeof(long), GFP_KERNEL);

		}

	} else {

		kfree(obj->bit_17);

		obj->bit_17 = NULL;

	}

err:

	drm_gem_object_unreference(&obj->base);

	mutex_unlock(&dev->struct_mutex);

	return ret;

}

/**

 * i915_gem_get_tiling - IOCTL handler to get tiling mode

 * @dev: DRM device

 * @data: data pointer for the ioctl

 * @file: DRM file for the ioctl call

 *

 * Returns the current tiling mode and required bit 6 swizzling for the object.

 *

 * Called by the user via ioctl.

 *

 * Returns:

 * Zero on success, negative errno on failure.

 */

int

i915_gem_get_tiling(struct drm_device *dev, void *data,

		   struct drm_file *file)

{

	struct drm_i915_gem_get_tiling *args = data;

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct drm_i915_gem_object *obj;

	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));

	if (&obj->base == NULL)

		return -ENOENT;

	mutex_lock(&dev->struct_mutex);

	args->tiling_mode = obj->tiling_mode;

	switch (obj->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");

	}

	/* Hide bit 17 from the user -- see comment in i915_gem_set_tiling */

	if (dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES)

		args->phys_swizzle_mode = I915_BIT_6_SWIZZLE_UNKNOWN;

	else

		args->phys_swizzle_mode = args->swizzle_mode;

	if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_17)

		args->swizzle_mode = I915_BIT_6_SWIZZLE_9;

	if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_10_17)

		args->swizzle_mode = I915_BIT_6_SWIZZLE_9_10;

	drm_gem_object_unreference(&obj->base);

	mutex_unlock(&dev->struct_mutex);

	return 0;

}