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/*

 * Copyright © 2010 Daniel Vetter

 *

 * 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.

 *

 */

#include 

#include 

#include "i915_drv.h"

#include "i915_trace.h"

#include "intel_drv.h"

#define AGP_USER_TYPES          (1 << 16)

#define AGP_USER_MEMORY         (AGP_USER_TYPES)

#define AGP_USER_CACHED_MEMORY  (AGP_USER_TYPES + 1)

/* PPGTT support for Sandybdrige/Gen6 and later */

static void i915_ppgtt_clear_range(struct i915_hw_ppgtt *ppgtt,

				   unsigned first_entry,

				   unsigned num_entries)

{

	uint32_t *pt_vaddr;

	uint32_t scratch_pte;

	unsigned act_pd = first_entry / I915_PPGTT_PT_ENTRIES;

	unsigned first_pte = first_entry % I915_PPGTT_PT_ENTRIES;

	unsigned last_pte, i;

	scratch_pte = GEN6_PTE_ADDR_ENCODE(ppgtt->scratch_page_dma_addr);

	scratch_pte |= GEN6_PTE_VALID | GEN6_PTE_CACHE_LLC;

    pt_vaddr = AllocKernelSpace(4096);

    if(pt_vaddr != NULL)

    {

        while (num_entries)

        {

            last_pte = first_pte + num_entries;

            if (last_pte > I915_PPGTT_PT_ENTRIES)

                last_pte = I915_PPGTT_PT_ENTRIES;

            MapPage(pt_vaddr,ppgtt->pt_pages[act_pd], 3);

            for (i = first_pte; i < last_pte; i++)

                pt_vaddr[i] = scratch_pte;

            num_entries -= last_pte - first_pte;

            first_pte = 0;

            act_pd++;

        }

        FreeKernelSpace(pt_vaddr);

    };

}

int i915_gem_init_aliasing_ppgtt(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct i915_hw_ppgtt *ppgtt;

	unsigned first_pd_entry_in_global_pt;

	int i;

	int ret = -ENOMEM;

	/* ppgtt PDEs reside in the global gtt pagetable, which has 512*1024

	 * entries. For aliasing ppgtt support we just steal them at the end for

	 * now. */

	first_pd_entry_in_global_pt = dev_priv->mm.gtt->gtt_total_entries - I915_PPGTT_PD_ENTRIES;

	ppgtt = kzalloc(sizeof(*ppgtt), GFP_KERNEL);

	if (!ppgtt)

		return ret;

	ppgtt->num_pd_entries = I915_PPGTT_PD_ENTRIES;

    ppgtt->pt_pages = kzalloc(sizeof(dma_addr_t)*ppgtt->num_pd_entries,

				  GFP_KERNEL);

	if (!ppgtt->pt_pages)

		goto err_ppgtt;

	for (i = 0; i < ppgtt->num_pd_entries; i++) {

        ppgtt->pt_pages[i] = AllocPage();

		if (!ppgtt->pt_pages[i])

			goto err_pt_alloc;

	}

/*

	if (dev_priv->mm.gtt->needs_dmar) {

		ppgtt->pt_dma_addr = kzalloc(sizeof(dma_addr_t)

						*ppgtt->num_pd_entries,

					     GFP_KERNEL);

		if (!ppgtt->pt_dma_addr)

			goto err_pt_alloc;

		for (i = 0; i < ppgtt->num_pd_entries; i++) {

			dma_addr_t pt_addr;

			pt_addr = pci_map_page(dev->pdev, ppgtt->pt_pages[i],

					       0, 4096,

					       PCI_DMA_BIDIRECTIONAL);

			if (pci_dma_mapping_error(dev->pdev,

						  pt_addr)) {

				ret = -EIO;

				goto err_pd_pin;

			}

			ppgtt->pt_dma_addr[i] = pt_addr;

		}

	}

*/

	ppgtt->scratch_page_dma_addr = dev_priv->mm.gtt->scratch_page_dma;

	i915_ppgtt_clear_range(ppgtt, 0,

			       ppgtt->num_pd_entries*I915_PPGTT_PT_ENTRIES);

	ppgtt->pd_offset = (first_pd_entry_in_global_pt)*sizeof(uint32_t);

	dev_priv->mm.aliasing_ppgtt = ppgtt;

	return 0;

err_pd_pin:

//   if (ppgtt->pt_dma_addr) {

//       for (i--; i >= 0; i--)

//           pci_unmap_page(dev->pdev, ppgtt->pt_dma_addr[i],

//                      4096, PCI_DMA_BIDIRECTIONAL);

//   }

err_pt_alloc:

//   kfree(ppgtt->pt_dma_addr);

	for (i = 0; i < ppgtt->num_pd_entries; i++) {

		if (ppgtt->pt_pages[i])

            FreePage(ppgtt->pt_pages[i]);

	}

	kfree(ppgtt->pt_pages);

err_ppgtt:

	kfree(ppgtt);

	return ret;

}

void i915_gem_cleanup_aliasing_ppgtt(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct i915_hw_ppgtt *ppgtt = dev_priv->mm.aliasing_ppgtt;

	int i;

	if (!ppgtt)

		return;

//   if (ppgtt->pt_dma_addr) {

//       for (i = 0; i < ppgtt->num_pd_entries; i++)

//           pci_unmap_page(dev->pdev, ppgtt->pt_dma_addr[i],

//                      4096, PCI_DMA_BIDIRECTIONAL);

//   }

//   kfree(ppgtt->pt_dma_addr);

	for (i = 0; i < ppgtt->num_pd_entries; i++)

        FreePage(ppgtt->pt_pages[i]);

	kfree(ppgtt->pt_pages);

	kfree(ppgtt);

}

static void i915_ppgtt_insert_sg_entries(struct i915_hw_ppgtt *ppgtt,

                     const struct pagelist *pages,

					 unsigned first_entry,

					 uint32_t pte_flags)

{

	uint32_t *pt_vaddr, pte;

	unsigned act_pd = first_entry / I915_PPGTT_PT_ENTRIES;

	unsigned first_pte = first_entry % I915_PPGTT_PT_ENTRIES;

    unsigned i, j;

	dma_addr_t page_addr;

	i = 0;

    pt_vaddr = AllocKernelSpace(4096);

    if( pt_vaddr != NULL)

    {

        while (i < pages->nents)

        {

            MapPage(pt_vaddr, ppgtt->pt_pages[act_pd], 3);

            for (j = first_pte; j < I915_PPGTT_PT_ENTRIES; j++, i++) {

                page_addr = pages->page[i];

                pte = GEN6_PTE_ADDR_ENCODE(page_addr);

                pt_vaddr[j] = pte | pte_flags;

            }

            first_pte = 0;

            act_pd++;

        }

        FreeKernelSpace(pt_vaddr);

    };

}

void i915_ppgtt_bind_object(struct i915_hw_ppgtt *ppgtt,

			    struct drm_i915_gem_object *obj,

			    enum i915_cache_level cache_level)

{

	uint32_t pte_flags = GEN6_PTE_VALID;

	switch (cache_level) {

	case I915_CACHE_LLC_MLC:

		pte_flags |= GEN6_PTE_CACHE_LLC_MLC;

		break;

	case I915_CACHE_LLC:

		pte_flags |= GEN6_PTE_CACHE_LLC;

		break;

	case I915_CACHE_NONE:

		if (IS_HASWELL(obj->base.dev))

			pte_flags |= HSW_PTE_UNCACHED;

		else

			pte_flags |= GEN6_PTE_UNCACHED;

		break;

	default:

		BUG();

	}

	i915_ppgtt_insert_sg_entries(ppgtt,

                     &obj->pages,

				     obj->gtt_space->start >> PAGE_SHIFT,

				     pte_flags);

}

void i915_ppgtt_unbind_object(struct i915_hw_ppgtt *ppgtt,

			      struct drm_i915_gem_object *obj)

{

	i915_ppgtt_clear_range(ppgtt,

			       obj->gtt_space->start >> PAGE_SHIFT,

			       obj->base.size >> PAGE_SHIFT);

}

/* XXX kill agp_type! */

static unsigned int cache_level_to_agp_type(struct drm_device *dev,

					    enum i915_cache_level cache_level)

{

	switch (cache_level) {

	case I915_CACHE_LLC_MLC:

		if (INTEL_INFO(dev)->gen >= 6)

			return AGP_USER_CACHED_MEMORY_LLC_MLC;

		/* Older chipsets do not have this extra level of CPU

		 * cacheing, so fallthrough and request the PTE simply

		 * as cached.

		 */

	case I915_CACHE_LLC:

		return AGP_USER_CACHED_MEMORY;

	default:

	case I915_CACHE_NONE:

		return AGP_USER_MEMORY;