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/*

 * Copyright 2008 Advanced Micro Devices, Inc.

 * Copyright 2008 Red Hat Inc.

 * Copyright 2009 Jerome Glisse.

 *

 * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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: Dave Airlie

 *          Alex Deucher

 *          Jerome Glisse

 */

#include 

#include 

#include "radeon.h"

static inline void *

pci_alloc_consistent(struct pci_dev *hwdev, size_t size,

                      addr_t *dma_handle)

{

    size = (size + 0x7FFF) & ~0x7FFF;

    *dma_handle = AllocPages(size >> 12);

    return (void*)MapIoMem(*dma_handle, size, PG_SW+PG_NOCACHE);

}

/*

 * GART

 * The GART (Graphics Aperture Remapping Table) is an aperture

 * in the GPU's address space.  System pages can be mapped into

 * the aperture and look like contiguous pages from the GPU's

 * perspective.  A page table maps the pages in the aperture

 * to the actual backing pages in system memory.

 *

 * Radeon GPUs support both an internal GART, as described above,

 * and AGP.  AGP works similarly, but the GART table is configured

 * and maintained by the northbridge rather than the driver.

 * Radeon hw has a separate AGP aperture that is programmed to

 * point to the AGP aperture provided by the northbridge and the

 * requests are passed through to the northbridge aperture.

 * Both AGP and internal GART can be used at the same time, however

 * that is not currently supported by the driver.

 *

 * This file handles the common internal GART management.

 */

/*

 * Common GART table functions.

 */

/**

 * radeon_gart_table_ram_alloc - allocate system ram for gart page table

 *

 * @rdev: radeon_device pointer

 *

 * Allocate system memory for GART page table

 * (r1xx-r3xx, non-pcie r4xx, rs400).  These asics require the

 * gart table to be in system memory.

 * Returns 0 for success, -ENOMEM for failure.

 */

int radeon_gart_table_ram_alloc(struct radeon_device *rdev)

{

	void *ptr;

    ptr = pci_alloc_consistent(rdev->pdev, rdev->gart.table_size,

                  &rdev->gart.table_addr);

	if (ptr == NULL) {

		return -ENOMEM;

	}

#ifdef CONFIG_X86

	if (rdev->family == CHIP_RS400 || rdev->family == CHIP_RS480 ||

	    rdev->family == CHIP_RS690 || rdev->family == CHIP_RS740) {

		set_memory_uc((unsigned long)ptr,

			      rdev->gart.table_size >> PAGE_SHIFT);

	}

#endif

	rdev->gart.ptr = ptr;

	memset((void *)rdev->gart.ptr, 0, rdev->gart.table_size);

	return 0;

}

/**

 * radeon_gart_table_ram_free - free system ram for gart page table

 *

 * @rdev: radeon_device pointer

 *

 * Free system memory for GART page table

 * (r1xx-r3xx, non-pcie r4xx, rs400).  These asics require the

 * gart table to be in system memory.

 */

void radeon_gart_table_ram_free(struct radeon_device *rdev)

{

	if (rdev->gart.ptr == NULL) {

		return;

	}

#ifdef CONFIG_X86

	if (rdev->family == CHIP_RS400 || rdev->family == CHIP_RS480 ||

	    rdev->family == CHIP_RS690 || rdev->family == CHIP_RS740) {

		set_memory_wb((unsigned long)rdev->gart.ptr,

			      rdev->gart.table_size >> PAGE_SHIFT);

	}

#endif

	rdev->gart.ptr = NULL;

	rdev->gart.table_addr = 0;

}

/**

 * radeon_gart_table_vram_alloc - allocate vram for gart page table

 *

 * @rdev: radeon_device pointer

 *

 * Allocate video memory for GART page table

 * (pcie r4xx, r5xx+).  These asics require the

 * gart table to be in video memory.

 * Returns 0 for success, error for failure.

 */

int radeon_gart_table_vram_alloc(struct radeon_device *rdev)

{

    int r;

	if (rdev->gart.robj == NULL) {

		r = radeon_bo_create(rdev, rdev->gart.table_size,

				     PAGE_SIZE, true, RADEON_GEM_DOMAIN_VRAM,

				     0, NULL, NULL, &rdev->gart.robj);

        if (r) {

            return r;

        }

    }

	return 0;

}

/**

 * radeon_gart_table_vram_pin - pin gart page table in vram

 *

 * @rdev: radeon_device pointer

 *

 * Pin the GART page table in vram so it will not be moved

 * by the memory manager (pcie r4xx, r5xx+).  These asics require the

 * gart table to be in video memory.

 * Returns 0 for success, error for failure.

 */

int radeon_gart_table_vram_pin(struct radeon_device *rdev)

{

	uint64_t gpu_addr;

	int r;

	r = radeon_bo_reserve(rdev->gart.robj, false);

	if (unlikely(r != 0))

		return r;

	r = radeon_bo_pin(rdev->gart.robj,

                  RADEON_GEM_DOMAIN_VRAM, &gpu_addr);

    if (r) {

		radeon_bo_unreserve(rdev->gart.robj);

        return r;

    }

	r = radeon_bo_kmap(rdev->gart.robj, &rdev->gart.ptr);

	if (r)

		radeon_bo_unpin(rdev->gart.robj);

	radeon_bo_unreserve(rdev->gart.robj);

	rdev->gart.table_addr = gpu_addr;

    return r;

}

/**

 * radeon_gart_table_vram_unpin - unpin gart page table in vram

 *

 * @rdev: radeon_device pointer

 *

 * Unpin the GART page table in vram (pcie r4xx, r5xx+).

 * These asics require the gart table to be in video memory.

 */

void radeon_gart_table_vram_unpin(struct radeon_device *rdev)

{

	int r;

	if (rdev->gart.robj == NULL) {

		return;

	}

	r = radeon_bo_reserve(rdev->gart.robj, false);

	if (likely(r == 0)) {

		radeon_bo_kunmap(rdev->gart.robj);

		radeon_bo_unpin(rdev->gart.robj);

		radeon_bo_unreserve(rdev->gart.robj);

		rdev->gart.ptr = NULL;

	}

}

/**

 * radeon_gart_table_vram_free - free gart page table vram

 *

 * @rdev: radeon_device pointer

 *

 * Free the video memory used for the GART page table

 * (pcie r4xx, r5xx+).  These asics require the gart table to

 * be in video memory.

 */

void radeon_gart_table_vram_free(struct radeon_device *rdev)

{

	if (rdev->gart.robj == NULL) {

		return;

	}

	radeon_bo_unref(&rdev->gart.robj);

}

/*

 * Common gart functions.

 */

/**

 * radeon_gart_unbind - unbind pages from the gart page table

 *

 * @rdev: radeon_device pointer

 * @offset: offset into the GPU's gart aperture

 * @pages: number of pages to unbind

 *

 * Unbinds the requested pages from the gart page table and

 * replaces them with the dummy page (all asics).

 */

void radeon_gart_unbind(struct radeon_device *rdev, unsigned offset,

			int pages)

{

	unsigned t;

	unsigned p;

	int i, j;

	u64 page_base;

	if (!rdev->gart.ready) {

		WARN(1, "trying to unbind memory from uninitialized GART !\n");

		return;

	}

	t = offset / RADEON_GPU_PAGE_SIZE;

	p = t / (PAGE_SIZE / RADEON_GPU_PAGE_SIZE);

	for (i = 0; i < pages; i++, p++) {

		if (rdev->gart.pages[p]) {

			rdev->gart.pages[p] = NULL;

			rdev->gart.pages_addr[p] = rdev->dummy_page.addr;

			page_base = rdev->gart.pages_addr[p];

			for (j = 0; j < (PAGE_SIZE / RADEON_GPU_PAGE_SIZE); j++, t++) {

				if (rdev->gart.ptr) {

					radeon_gart_set_page(rdev, t, page_base,

							     RADEON_GART_PAGE_DUMMY);

				}

				page_base += RADEON_GPU_PAGE_SIZE;

			}

		}

	}

	mb();

	radeon_gart_tlb_flush(rdev);

}

/**

 * radeon_gart_bind - bind pages into the gart page table

 *

 * @rdev: radeon_device pointer

 * @offset: offset into the GPU's gart aperture

 * @pages: number of pages to bind

 * @pagelist: pages to bind

 * @dma_addr: DMA addresses of pages

 * @flags: RADEON_GART_PAGE_* flags

 *

 * Binds the requested pages to the gart page table

 * (all asics).

 * Returns 0 for success, -EINVAL for failure.

 */

int radeon_gart_bind(struct radeon_device *rdev, unsigned offset,

		     int pages, struct page **pagelist, dma_addr_t *dma_addr,

		     uint32_t flags)

{

    unsigned t;

    unsigned p;

    uint64_t page_base;

    int i, j;

    if (!rdev->gart.ready) {

		WARN(1, "trying to bind memory to uninitialized GART !\n");

        return -EINVAL;

    }

	t = offset / RADEON_GPU_PAGE_SIZE;

	p = t / (PAGE_SIZE / RADEON_GPU_PAGE_SIZE);

    for (i = 0; i < pages; i++, p++) {

		rdev->gart.pages_addr[p] = dma_addr[i];

        rdev->gart.pages[p] = pagelist[i];

		if (rdev->gart.ptr) {

		page_base = rdev->gart.pages_addr[p];

		for (j = 0; j < (PAGE_SIZE / RADEON_GPU_PAGE_SIZE); j++, t++) {

				radeon_gart_set_page(rdev, t, page_base, flags);

			page_base += RADEON_GPU_PAGE_SIZE;

        }

    }

	}

    mb();

    radeon_gart_tlb_flush(rdev);

    return 0;

}

/**

 * radeon_gart_init - init the driver info for managing the gart

 *

 * @rdev: radeon_device pointer

 *

 * Allocate the dummy page and init the gart driver info (all asics).

 * Returns 0 for success, error for failure.

 */

int radeon_gart_init(struct radeon_device *rdev)

{

	int r, i;

    if (rdev->gart.pages) {

        return 0;

    }

	/* We need PAGE_SIZE >= RADEON_GPU_PAGE_SIZE */

	if (PAGE_SIZE < RADEON_GPU_PAGE_SIZE) {

        DRM_ERROR("Page size is smaller than GPU page size!\n");

        return -EINVAL;

    }

	r = radeon_dummy_page_init(rdev);

	if (r)

		return r;

    /* Compute table size */

    rdev->gart.num_cpu_pages = rdev->mc.gtt_size / PAGE_SIZE;

	rdev->gart.num_gpu_pages = rdev->mc.gtt_size / RADEON_GPU_PAGE_SIZE;

    DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n",

         rdev->gart.num_cpu_pages, rdev->gart.num_gpu_pages);

    /* Allocate pages table */

	rdev->gart.pages = vzalloc(sizeof(void *) * rdev->gart.num_cpu_pages);

    if (rdev->gart.pages == NULL) {

		radeon_gart_fini(rdev);

        return -ENOMEM;

    }

	rdev->gart.pages_addr = vzalloc(sizeof(dma_addr_t) *

					rdev->gart.num_cpu_pages);

    if (rdev->gart.pages_addr == NULL) {

		radeon_gart_fini(rdev);

        return -ENOMEM;

    }

	/* set GART entry to point to the dummy page by default */

	for (i = 0; i < rdev->gart.num_cpu_pages; i++) {

		rdev->gart.pages_addr[i] = rdev->dummy_page.addr;

	}

    return 0;

}

/**

 * radeon_gart_fini - tear down the driver info for managing the gart

 *

 * @rdev: radeon_device pointer

 *

 * Tear down the gart driver info and free the dummy page (all asics).

 */

void radeon_gart_fini(struct radeon_device *rdev)

{

	if (rdev->gart.pages && rdev->gart.pages_addr && rdev->gart.ready) {

		/* unbind pages */

		radeon_gart_unbind(rdev, 0, rdev->gart.num_cpu_pages);

	}

	rdev->gart.ready = false;

	vfree(rdev->gart.pages);

	vfree(rdev->gart.pages_addr);

	rdev->gart.pages = NULL;

	rdev->gart.pages_addr = NULL;

	radeon_dummy_page_fini(rdev);

}