First Support on Ginger and OMAP TI

[linux-ginger.git] / arch / powerpc / platforms / ps3 / mm.c

/*
 *  PS3 address space management.
 *
 *  Copyright (C) 2006 Sony Computer Entertainment Inc.
 *  Copyright 2006 Sony Corp.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/memory_hotplug.h>
#include <linux/lmb.h>

#include <asm/cell-regs.h>
#include <asm/firmware.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <asm/lv1call.h>

#include "platform.h"

#if defined(DEBUG)
#define DBG udbg_printf
#else
#define DBG pr_debug
#endif

enum {
#if defined(CONFIG_PS3_DYNAMIC_DMA)
        USE_DYNAMIC_DMA = 1,
#else
        USE_DYNAMIC_DMA = 0,
#endif
};

enum {
        PAGE_SHIFT_4K = 12U,
        PAGE_SHIFT_64K = 16U,
        PAGE_SHIFT_16M = 24U,
};

static unsigned long make_page_sizes(unsigned long a, unsigned long b)
{
        return (a << 56) | (b << 48);
}

enum {
        ALLOCATE_MEMORY_TRY_ALT_UNIT = 0X04,
        ALLOCATE_MEMORY_ADDR_ZERO = 0X08,
};

/* valid htab sizes are {18,19,20} = 256K, 512K, 1M */

enum {
        HTAB_SIZE_MAX = 20U, /* HV limit of 1MB */
        HTAB_SIZE_MIN = 18U, /* CPU limit of 256KB */
};

/*============================================================================*/
/* virtual address space routines                                             */
/*============================================================================*/

/**
 * struct mem_region - memory region structure
 * @base: base address
 * @size: size in bytes
 * @offset: difference between base and rm.size
 */

struct mem_region {
        u64 base;
        u64 size;
        unsigned long offset;
};

/**
 * struct map - address space state variables holder
 * @total: total memory available as reported by HV
 * @vas_id - HV virtual address space id
 * @htab_size: htab size in bytes
 *
 * The HV virtual address space (vas) allows for hotplug memory regions.
 * Memory regions can be created and destroyed in the vas at runtime.
 * @rm: real mode (bootmem) region
 * @r1: hotplug memory region(s)
 *
 * ps3 addresses
 * virt_addr: a cpu 'translated' effective address
 * phys_addr: an address in what Linux thinks is the physical address space
 * lpar_addr: an address in the HV virtual address space
 * bus_addr: an io controller 'translated' address on a device bus
 */

struct map {
        u64 total;
        u64 vas_id;
        u64 htab_size;
        struct mem_region rm;
        struct mem_region r1;
};

#define debug_dump_map(x) _debug_dump_map(x, __func__, __LINE__)
static void __maybe_unused _debug_dump_map(const struct map *m,
        const char *func, int line)
{
        DBG("%s:%d: map.total     = %llxh\n", func, line, m->total);
        DBG("%s:%d: map.rm.size   = %llxh\n", func, line, m->rm.size);
        DBG("%s:%d: map.vas_id    = %llu\n", func, line, m->vas_id);
        DBG("%s:%d: map.htab_size = %llxh\n", func, line, m->htab_size);
        DBG("%s:%d: map.r1.base   = %llxh\n", func, line, m->r1.base);
        DBG("%s:%d: map.r1.offset = %lxh\n", func, line, m->r1.offset);
        DBG("%s:%d: map.r1.size   = %llxh\n", func, line, m->r1.size);
}

static struct map map;

/**
 * ps3_mm_phys_to_lpar - translate a linux physical address to lpar address
 * @phys_addr: linux physical address
 */

unsigned long ps3_mm_phys_to_lpar(unsigned long phys_addr)
{
        BUG_ON(is_kernel_addr(phys_addr));
        return (phys_addr < map.rm.size || phys_addr >= map.total)
                ? phys_addr : phys_addr + map.r1.offset;
}

EXPORT_SYMBOL(ps3_mm_phys_to_lpar);

/**
 * ps3_mm_vas_create - create the virtual address space
 */

void __init ps3_mm_vas_create(unsigned long* htab_size)
{
        int result;
        u64 start_address;
        u64 size;
        u64 access_right;
        u64 max_page_size;
        u64 flags;

        result = lv1_query_logical_partition_address_region_info(0,
                &start_address, &size, &access_right, &max_page_size,
                &flags);

        if (result) {
                DBG("%s:%d: lv1_query_logical_partition_address_region_info "
                        "failed: %s\n", __func__, __LINE__,
                        ps3_result(result));
                goto fail;
        }

        if (max_page_size < PAGE_SHIFT_16M) {
                DBG("%s:%d: bad max_page_size %llxh\n", __func__, __LINE__,
                        max_page_size);
                goto fail;
        }

        BUILD_BUG_ON(CONFIG_PS3_HTAB_SIZE > HTAB_SIZE_MAX);
        BUILD_BUG_ON(CONFIG_PS3_HTAB_SIZE < HTAB_SIZE_MIN);

        result = lv1_construct_virtual_address_space(CONFIG_PS3_HTAB_SIZE,
                        2, make_page_sizes(PAGE_SHIFT_16M, PAGE_SHIFT_64K),
                        &map.vas_id, &map.htab_size);

        if (result) {
                DBG("%s:%d: lv1_construct_virtual_address_space failed: %s\n",
                        __func__, __LINE__, ps3_result(result));
                goto fail;
        }

        result = lv1_select_virtual_address_space(map.vas_id);

        if (result) {
                DBG("%s:%d: lv1_select_virtual_address_space failed: %s\n",
                        __func__, __LINE__, ps3_result(result));
                goto fail;
        }

        *htab_size = map.htab_size;

        debug_dump_map(&map);

        return;

fail:
        panic("ps3_mm_vas_create failed");
}

/**
 * ps3_mm_vas_destroy -
 */

void ps3_mm_vas_destroy(void)
{
        int result;

        DBG("%s:%d: map.vas_id    = %llu\n", __func__, __LINE__, map.vas_id);

        if (map.vas_id) {
                result = lv1_select_virtual_address_space(0);
                BUG_ON(result);
                result = lv1_destruct_virtual_address_space(map.vas_id);
                BUG_ON(result);
                map.vas_id = 0;
        }
}

/*============================================================================*/
/* memory hotplug routines                                                    */
/*============================================================================*/

/**
 * ps3_mm_region_create - create a memory region in the vas
 * @r: pointer to a struct mem_region to accept initialized values
 * @size: requested region size
 *
 * This implementation creates the region with the vas large page size.
 * @size is rounded down to a multiple of the vas large page size.
 */

static int ps3_mm_region_create(struct mem_region *r, unsigned long size)
{
        int result;
        u64 muid;

        r->size = _ALIGN_DOWN(size, 1 << PAGE_SHIFT_16M);

        DBG("%s:%d requested  %lxh\n", __func__, __LINE__, size);
        DBG("%s:%d actual     %llxh\n", __func__, __LINE__, r->size);
        DBG("%s:%d difference %llxh (%lluMB)\n", __func__, __LINE__,
                size - r->size, (size - r->size) / 1024 / 1024);

        if (r->size == 0) {
                DBG("%s:%d: size == 0\n", __func__, __LINE__);
                result = -1;
                goto zero_region;
        }

        result = lv1_allocate_memory(r->size, PAGE_SHIFT_16M, 0,
                ALLOCATE_MEMORY_TRY_ALT_UNIT, &r->base, &muid);

        if (result || r->base < map.rm.size) {
                DBG("%s:%d: lv1_allocate_memory failed: %s\n",
                        __func__, __LINE__, ps3_result(result));
                goto zero_region;
        }

        r->offset = r->base - map.rm.size;
        return result;

zero_region:
        r->size = r->base = r->offset = 0;
        return result;
}

/**
 * ps3_mm_region_destroy - destroy a memory region
 * @r: pointer to struct mem_region
 */

static void ps3_mm_region_destroy(struct mem_region *r)
{
        int result;

        DBG("%s:%d: r->base = %llxh\n", __func__, __LINE__, r->base);
        if (r->base) {
                result = lv1_release_memory(r->base);
                BUG_ON(result);
                r->size = r->base = r->offset = 0;
                map.total = map.rm.size;
        }
}

/**
 * ps3_mm_add_memory - hot add memory
 */

static int __init ps3_mm_add_memory(void)
{
        int result;
        unsigned long start_addr;
        unsigned long start_pfn;
        unsigned long nr_pages;

        if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
                return -ENODEV;

        BUG_ON(!mem_init_done);

        start_addr = map.rm.size;
        start_pfn = start_addr >> PAGE_SHIFT;
        nr_pages = (map.r1.size + PAGE_SIZE - 1) >> PAGE_SHIFT;

        DBG("%s:%d: start_addr %lxh, start_pfn %lxh, nr_pages %lxh\n",
                __func__, __LINE__, start_addr, start_pfn, nr_pages);

        result = add_memory(0, start_addr, map.r1.size);

        if (result) {
                pr_err("%s:%d: add_memory failed: (%d)\n",
                        __func__, __LINE__, result);
                return result;
        }

        lmb_add(start_addr, map.r1.size);
        lmb_analyze();

        result = online_pages(start_pfn, nr_pages);

        if (result)
                pr_err("%s:%d: online_pages failed: (%d)\n",
                        __func__, __LINE__, result);

        return result;
}

device_initcall(ps3_mm_add_memory);

/*============================================================================*/
/* dma routines                                                               */
/*============================================================================*/

/**
 * dma_sb_lpar_to_bus - Translate an lpar address to ioc mapped bus address.
 * @r: pointer to dma region structure
 * @lpar_addr: HV lpar address
 */

static unsigned long dma_sb_lpar_to_bus(struct ps3_dma_region *r,
        unsigned long lpar_addr)
{
        if (lpar_addr >= map.rm.size)
                lpar_addr -= map.r1.offset;
        BUG_ON(lpar_addr < r->offset);
        BUG_ON(lpar_addr >= r->offset + r->len);
        return r->bus_addr + lpar_addr - r->offset;
}

#define dma_dump_region(_a) _dma_dump_region(_a, __func__, __LINE__)
static void  __maybe_unused _dma_dump_region(const struct ps3_dma_region *r,
        const char *func, int line)
{
        DBG("%s:%d: dev        %llu:%llu\n", func, line, r->dev->bus_id,
                r->dev->dev_id);
        DBG("%s:%d: page_size  %u\n", func, line, r->page_size);
        DBG("%s:%d: bus_addr   %lxh\n", func, line, r->bus_addr);
        DBG("%s:%d: len        %lxh\n", func, line, r->len);
        DBG("%s:%d: offset     %lxh\n", func, line, r->offset);
}

  /**
 * dma_chunk - A chunk of dma pages mapped by the io controller.
 * @region - The dma region that owns this chunk.
 * @lpar_addr: Starting lpar address of the area to map.
 * @bus_addr: Starting ioc bus address of the area to map.
 * @len: Length in bytes of the area to map.
 * @link: A struct list_head used with struct ps3_dma_region.chunk_list, the
 * list of all chuncks owned by the region.
 *
 * This implementation uses a very simple dma page manager
 * based on the dma_chunk structure.  This scheme assumes
 * that all drivers use very well behaved dma ops.
 */

struct dma_chunk {
        struct ps3_dma_region *region;
        unsigned long lpar_addr;
        unsigned long bus_addr;
        unsigned long len;
        struct list_head link;
        unsigned int usage_count;
};

#define dma_dump_chunk(_a) _dma_dump_chunk(_a, __func__, __LINE__)
static void _dma_dump_chunk (const struct dma_chunk* c, const char* func,
        int line)
{
        DBG("%s:%d: r.dev        %llu:%llu\n", func, line,
                c->region->dev->bus_id, c->region->dev->dev_id);
        DBG("%s:%d: r.bus_addr   %lxh\n", func, line, c->region->bus_addr);
        DBG("%s:%d: r.page_size  %u\n", func, line, c->region->page_size);
        DBG("%s:%d: r.len        %lxh\n", func, line, c->region->len);
        DBG("%s:%d: r.offset     %lxh\n", func, line, c->region->offset);
        DBG("%s:%d: c.lpar_addr  %lxh\n", func, line, c->lpar_addr);
        DBG("%s:%d: c.bus_addr   %lxh\n", func, line, c->bus_addr);
        DBG("%s:%d: c.len        %lxh\n", func, line, c->len);
}

static struct dma_chunk * dma_find_chunk(struct ps3_dma_region *r,
        unsigned long bus_addr, unsigned long len)
{
        struct dma_chunk *c;
        unsigned long aligned_bus = _ALIGN_DOWN(bus_addr, 1 << r->page_size);
        unsigned long aligned_len = _ALIGN_UP(len+bus_addr-aligned_bus,
                                              1 << r->page_size);

        list_for_each_entry(c, &r->chunk_list.head, link) {
                /* intersection */
                if (aligned_bus >= c->bus_addr &&
                    aligned_bus + aligned_len <= c->bus_addr + c->len)
                        return c;

                /* below */
                if (aligned_bus + aligned_len <= c->bus_addr)
                        continue;

                /* above */
                if (aligned_bus >= c->bus_addr + c->len)
                        continue;

                /* we don't handle the multi-chunk case for now */
                dma_dump_chunk(c);
                BUG();
        }
        return NULL;
}

static struct dma_chunk *dma_find_chunk_lpar(struct ps3_dma_region *r,
        unsigned long lpar_addr, unsigned long len)
{
        struct dma_chunk *c;
        unsigned long aligned_lpar = _ALIGN_DOWN(lpar_addr, 1 << r->page_size);
        unsigned long aligned_len = _ALIGN_UP(len + lpar_addr - aligned_lpar,
                                              1 << r->page_size);

        list_for_each_entry(c, &r->chunk_list.head, link) {
                /* intersection */
                if (c->lpar_addr <= aligned_lpar &&
                    aligned_lpar < c->lpar_addr + c->len) {
                        if (aligned_lpar + aligned_len <= c->lpar_addr + c->len)
                                return c;
                        else {
                                dma_dump_chunk(c);
                                BUG();
                        }
                }
                /* below */
                if (aligned_lpar + aligned_len <= c->lpar_addr) {
                        continue;
                }
                /* above */
                if (c->lpar_addr + c->len <= aligned_lpar) {
                        continue;
                }
        }
        return NULL;
}

static int dma_sb_free_chunk(struct dma_chunk *c)
{
        int result = 0;

        if (c->bus_addr) {
                result = lv1_unmap_device_dma_region(c->region->dev->bus_id,
                        c->region->dev->dev_id, c->bus_addr, c->len);
                BUG_ON(result);
        }

        kfree(c);
        return result;
}

static int dma_ioc0_free_chunk(struct dma_chunk *c)
{
        int result = 0;
        int iopage;
        unsigned long offset;
        struct ps3_dma_region *r = c->region;

        DBG("%s:start\n", __func__);
        for (iopage = 0; iopage < (c->len >> r->page_size); iopage++) {
                offset = (1 << r->page_size) * iopage;
                /* put INVALID entry */
                result = lv1_put_iopte(0,
                                       c->bus_addr + offset,
                                       c->lpar_addr + offset,
                                       r->ioid,
                                       0);
                DBG("%s: bus=%#lx, lpar=%#lx, ioid=%d\n", __func__,
                    c->bus_addr + offset,
                    c->lpar_addr + offset,
                    r->ioid);

                if (result) {
                        DBG("%s:%d: lv1_put_iopte failed: %s\n", __func__,
                            __LINE__, ps3_result(result));
                }
        }
        kfree(c);
        DBG("%s:end\n", __func__);
        return result;
}

/**
 * dma_sb_map_pages - Maps dma pages into the io controller bus address space.
 * @r: Pointer to a struct ps3_dma_region.
 * @phys_addr: Starting physical address of the area to map.
 * @len: Length in bytes of the area to map.
 * c_out: A pointer to receive an allocated struct dma_chunk for this area.
 *
 * This is the lowest level dma mapping routine, and is the one that will
 * make the HV call to add the pages into the io controller address space.
 */

static int dma_sb_map_pages(struct ps3_dma_region *r, unsigned long phys_addr,
            unsigned long len, struct dma_chunk **c_out, u64 iopte_flag)
{
        int result;
        struct dma_chunk *c;

        c = kzalloc(sizeof(struct dma_chunk), GFP_ATOMIC);

        if (!c) {
                result = -ENOMEM;
                goto fail_alloc;
        }

        c->region = r;
        c->lpar_addr = ps3_mm_phys_to_lpar(phys_addr);
        c->bus_addr = dma_sb_lpar_to_bus(r, c->lpar_addr);
        c->len = len;

        BUG_ON(iopte_flag != 0xf800000000000000UL);
        result = lv1_map_device_dma_region(c->region->dev->bus_id,
                                           c->region->dev->dev_id, c->lpar_addr,
                                           c->bus_addr, c->len, iopte_flag);
        if (result) {
                DBG("%s:%d: lv1_map_device_dma_region failed: %s\n",
                        __func__, __LINE__, ps3_result(result));
                goto fail_map;
        }

        list_add(&c->link, &r->chunk_list.head);

        *c_out = c;
        return 0;

fail_map:
        kfree(c);
fail_alloc:
        *c_out = NULL;
        DBG(" <- %s:%d\n", __func__, __LINE__);
        return result;
}

static int dma_ioc0_map_pages(struct ps3_dma_region *r, unsigned long phys_addr,
                              unsigned long len, struct dma_chunk **c_out,
                              u64 iopte_flag)
{
        int result;
        struct dma_chunk *c, *last;
        int iopage, pages;
        unsigned long offset;

        DBG(KERN_ERR "%s: phy=%#lx, lpar%#lx, len=%#lx\n", __func__,
            phys_addr, ps3_mm_phys_to_lpar(phys_addr), len);
        c = kzalloc(sizeof(struct dma_chunk), GFP_ATOMIC);

        if (!c) {
                result = -ENOMEM;
                goto fail_alloc;
        }

        c->region = r;
        c->len = len;
        c->lpar_addr = ps3_mm_phys_to_lpar(phys_addr);
        /* allocate IO address */
        if (list_empty(&r->chunk_list.head)) {
                /* first one */
                c->bus_addr = r->bus_addr;
        } else {
                /* derive from last bus addr*/
                last  = list_entry(r->chunk_list.head.next,
                                   struct dma_chunk, link);
                c->bus_addr = last->bus_addr + last->len;
                DBG("%s: last bus=%#lx, len=%#lx\n", __func__,
                    last->bus_addr, last->len);
        }

        /* FIXME: check whether length exceeds region size */

        /* build ioptes for the area */
        pages = len >> r->page_size;
        DBG("%s: pgsize=%#x len=%#lx pages=%#x iopteflag=%#llx\n", __func__,
            r->page_size, r->len, pages, iopte_flag);
        for (iopage = 0; iopage < pages; iopage++) {
                offset = (1 << r->page_size) * iopage;
                result = lv1_put_iopte(0,
                                       c->bus_addr + offset,
                                       c->lpar_addr + offset,
                                       r->ioid,
                                       iopte_flag);
                if (result) {
                        pr_warning("%s:%d: lv1_put_iopte failed: %s\n",
                                   __func__, __LINE__, ps3_result(result));
                        goto fail_map;
                }
                DBG("%s: pg=%d bus=%#lx, lpar=%#lx, ioid=%#x\n", __func__,
                    iopage, c->bus_addr + offset, c->lpar_addr + offset,
                    r->ioid);
        }

        /* be sure that last allocated one is inserted at head */
        list_add(&c->link, &r->chunk_list.head);

        *c_out = c;
        DBG("%s: end\n", __func__);
        return 0;

fail_map:
        for (iopage--; 0 <= iopage; iopage--) {
                lv1_put_iopte(0,
                              c->bus_addr + offset,
                              c->lpar_addr + offset,
                              r->ioid,
                              0);
        }
        kfree(c);
fail_alloc:
        *c_out = NULL;
        return result;
}

/**
 * dma_sb_region_create - Create a device dma region.
 * @r: Pointer to a struct ps3_dma_region.
 *
 * This is the lowest level dma region create routine, and is the one that
 * will make the HV call to create the region.
 */

static int dma_sb_region_create(struct ps3_dma_region *r)
{
        int result;
        u64 bus_addr;

        DBG(" -> %s:%d:\n", __func__, __LINE__);

        BUG_ON(!r);

        if (!r->dev->bus_id) {
                pr_info("%s:%d: %llu:%llu no dma\n", __func__, __LINE__,
                        r->dev->bus_id, r->dev->dev_id);
                return 0;
        }

        DBG("%s:%u: len = 0x%lx, page_size = %u, offset = 0x%lx\n", __func__,
            __LINE__, r->len, r->page_size, r->offset);

        BUG_ON(!r->len);
        BUG_ON(!r->page_size);
        BUG_ON(!r->region_ops);

        INIT_LIST_HEAD(&r->chunk_list.head);
        spin_lock_init(&r->chunk_list.lock);

        result = lv1_allocate_device_dma_region(r->dev->bus_id, r->dev->dev_id,
                roundup_pow_of_two(r->len), r->page_size, r->region_type,
                &bus_addr);
        r->bus_addr = bus_addr;

        if (result) {
                DBG("%s:%d: lv1_allocate_device_dma_region failed: %s\n",
                        __func__, __LINE__, ps3_result(result));
                r->len = r->bus_addr = 0;
        }

        return result;
}

static int dma_ioc0_region_create(struct ps3_dma_region *r)
{
        int result;
        u64 bus_addr;

        INIT_LIST_HEAD(&r->chunk_list.head);
        spin_lock_init(&r->chunk_list.lock);

        result = lv1_allocate_io_segment(0,
                                         r->len,
                                         r->page_size,
                                         &bus_addr);
        r->bus_addr = bus_addr;
        if (result) {
                DBG("%s:%d: lv1_allocate_io_segment failed: %s\n",
                        __func__, __LINE__, ps3_result(result));
                r->len = r->bus_addr = 0;
        }
        DBG("%s: len=%#lx, pg=%d, bus=%#lx\n", __func__,
            r->len, r->page_size, r->bus_addr);
        return result;
}

/**
 * dma_region_free - Free a device dma region.
 * @r: Pointer to a struct ps3_dma_region.
 *
 * This is the lowest level dma region free routine, and is the one that
 * will make the HV call to free the region.
 */

static int dma_sb_region_free(struct ps3_dma_region *r)
{
        int result;
        struct dma_chunk *c;
        struct dma_chunk *tmp;

        BUG_ON(!r);

        if (!r->dev->bus_id) {
                pr_info("%s:%d: %llu:%llu no dma\n", __func__, __LINE__,
                        r->dev->bus_id, r->dev->dev_id);
                return 0;
        }

        list_for_each_entry_safe(c, tmp, &r->chunk_list.head, link) {
                list_del(&c->link);
                dma_sb_free_chunk(c);
        }

        result = lv1_free_device_dma_region(r->dev->bus_id, r->dev->dev_id,
                r->bus_addr);

        if (result)
                DBG("%s:%d: lv1_free_device_dma_region failed: %s\n",
                        __func__, __LINE__, ps3_result(result));

        r->bus_addr = 0;

        return result;
}

static int dma_ioc0_region_free(struct ps3_dma_region *r)
{
        int result;
        struct dma_chunk *c, *n;

        DBG("%s: start\n", __func__);
        list_for_each_entry_safe(c, n, &r->chunk_list.head, link) {
                list_del(&c->link);
                dma_ioc0_free_chunk(c);
        }

        result = lv1_release_io_segment(0, r->bus_addr);

        if (result)
                DBG("%s:%d: lv1_free_device_dma_region failed: %s\n",
                        __func__, __LINE__, ps3_result(result));

        r->bus_addr = 0;
        DBG("%s: end\n", __func__);

        return result;
}

/**
 * dma_sb_map_area - Map an area of memory into a device dma region.
 * @r: Pointer to a struct ps3_dma_region.
 * @virt_addr: Starting virtual address of the area to map.
 * @len: Length in bytes of the area to map.
 * @bus_addr: A pointer to return the starting ioc bus address of the area to
 * map.
 *
 * This is the common dma mapping routine.
 */

static int dma_sb_map_area(struct ps3_dma_region *r, unsigned long virt_addr,
           unsigned long len, dma_addr_t *bus_addr,
           u64 iopte_flag)
{
        int result;
        unsigned long flags;
        struct dma_chunk *c;
        unsigned long phys_addr = is_kernel_addr(virt_addr) ? __pa(virt_addr)
                : virt_addr;
        unsigned long aligned_phys = _ALIGN_DOWN(phys_addr, 1 << r->page_size);
        unsigned long aligned_len = _ALIGN_UP(len + phys_addr - aligned_phys,
                                              1 << r->page_size);
        *bus_addr = dma_sb_lpar_to_bus(r, ps3_mm_phys_to_lpar(phys_addr));

        if (!USE_DYNAMIC_DMA) {
                unsigned long lpar_addr = ps3_mm_phys_to_lpar(phys_addr);
                DBG(" -> %s:%d\n", __func__, __LINE__);
                DBG("%s:%d virt_addr %lxh\n", __func__, __LINE__,
                        virt_addr);
                DBG("%s:%d phys_addr %lxh\n", __func__, __LINE__,
                        phys_addr);
                DBG("%s:%d lpar_addr %lxh\n", __func__, __LINE__,
                        lpar_addr);
                DBG("%s:%d len       %lxh\n", __func__, __LINE__, len);
                DBG("%s:%d bus_addr  %llxh (%lxh)\n", __func__, __LINE__,
                *bus_addr, len);
        }

        spin_lock_irqsave(&r->chunk_list.lock, flags);
        c = dma_find_chunk(r, *bus_addr, len);

        if (c) {
                DBG("%s:%d: reusing mapped chunk", __func__, __LINE__);
                dma_dump_chunk(c);
                c->usage_count++;
                spin_unlock_irqrestore(&r->chunk_list.lock, flags);
                return 0;
        }

        result = dma_sb_map_pages(r, aligned_phys, aligned_len, &c, iopte_flag);

        if (result) {
                *bus_addr = 0;
                DBG("%s:%d: dma_sb_map_pages failed (%d)\n",
                        __func__, __LINE__, result);
                spin_unlock_irqrestore(&r->chunk_list.lock, flags);
                return result;
        }

        c->usage_count = 1;

        spin_unlock_irqrestore(&r->chunk_list.lock, flags);
        return result;
}

static int dma_ioc0_map_area(struct ps3_dma_region *r, unsigned long virt_addr,
             unsigned long len, dma_addr_t *bus_addr,
             u64 iopte_flag)
{
        int result;
        unsigned long flags;
        struct dma_chunk *c;
        unsigned long phys_addr = is_kernel_addr(virt_addr) ? __pa(virt_addr)
                : virt_addr;
        unsigned long aligned_phys = _ALIGN_DOWN(phys_addr, 1 << r->page_size);
        unsigned long aligned_len = _ALIGN_UP(len + phys_addr - aligned_phys,
                                              1 << r->page_size);

        DBG(KERN_ERR "%s: vaddr=%#lx, len=%#lx\n", __func__,
            virt_addr, len);
        DBG(KERN_ERR "%s: ph=%#lx a_ph=%#lx a_l=%#lx\n", __func__,
            phys_addr, aligned_phys, aligned_len);

        spin_lock_irqsave(&r->chunk_list.lock, flags);
        c = dma_find_chunk_lpar(r, ps3_mm_phys_to_lpar(phys_addr), len);

        if (c) {
                /* FIXME */
                BUG();
                *bus_addr = c->bus_addr + phys_addr - aligned_phys;
                c->usage_count++;
                spin_unlock_irqrestore(&r->chunk_list.lock, flags);
                return 0;
        }

        result = dma_ioc0_map_pages(r, aligned_phys, aligned_len, &c,
                                    iopte_flag);

        if (result) {
                *bus_addr = 0;
                DBG("%s:%d: dma_ioc0_map_pages failed (%d)\n",
                        __func__, __LINE__, result);
                spin_unlock_irqrestore(&r->chunk_list.lock, flags);
                return result;
        }
        *bus_addr = c->bus_addr + phys_addr - aligned_phys;
        DBG("%s: va=%#lx pa=%#lx a_pa=%#lx bus=%#llx\n", __func__,
            virt_addr, phys_addr, aligned_phys, *bus_addr);
        c->usage_count = 1;

        spin_unlock_irqrestore(&r->chunk_list.lock, flags);
        return result;
}

/**
 * dma_sb_unmap_area - Unmap an area of memory from a device dma region.
 * @r: Pointer to a struct ps3_dma_region.
 * @bus_addr: The starting ioc bus address of the area to unmap.
 * @len: Length in bytes of the area to unmap.
 *
 * This is the common dma unmap routine.
 */

static int dma_sb_unmap_area(struct ps3_dma_region *r, dma_addr_t bus_addr,
        unsigned long len)
{
        unsigned long flags;
        struct dma_chunk *c;

        spin_lock_irqsave(&r->chunk_list.lock, flags);
        c = dma_find_chunk(r, bus_addr, len);

        if (!c) {
                unsigned long aligned_bus = _ALIGN_DOWN(bus_addr,
                        1 << r->page_size);
                unsigned long aligned_len = _ALIGN_UP(len + bus_addr
                        - aligned_bus, 1 << r->page_size);
                DBG("%s:%d: not found: bus_addr %llxh\n",
                        __func__, __LINE__, bus_addr);
                DBG("%s:%d: not found: len %lxh\n",
                        __func__, __LINE__, len);
                DBG("%s:%d: not found: aligned_bus %lxh\n",
                        __func__, __LINE__, aligned_bus);
                DBG("%s:%d: not found: aligned_len %lxh\n",
                        __func__, __LINE__, aligned_len);
                BUG();
        }

        c->usage_count--;

        if (!c->usage_count) {
                list_del(&c->link);
                dma_sb_free_chunk(c);
        }

        spin_unlock_irqrestore(&r->chunk_list.lock, flags);
        return 0;
}

static int dma_ioc0_unmap_area(struct ps3_dma_region *r,
                        dma_addr_t bus_addr, unsigned long len)
{
        unsigned long flags;
        struct dma_chunk *c;

        DBG("%s: start a=%#llx l=%#lx\n", __func__, bus_addr, len);
        spin_lock_irqsave(&r->chunk_list.lock, flags);
        c = dma_find_chunk(r, bus_addr, len);

        if (!c) {
                unsigned long aligned_bus = _ALIGN_DOWN(bus_addr,
                                                        1 << r->page_size);
                unsigned long aligned_len = _ALIGN_UP(len + bus_addr
                                                      - aligned_bus,
                                                      1 << r->page_size);
                DBG("%s:%d: not found: bus_addr %llxh\n",
                    __func__, __LINE__, bus_addr);
                DBG("%s:%d: not found: len %lxh\n",
                    __func__, __LINE__, len);
                DBG("%s:%d: not found: aligned_bus %lxh\n",
                    __func__, __LINE__, aligned_bus);
                DBG("%s:%d: not found: aligned_len %lxh\n",
                    __func__, __LINE__, aligned_len);
                BUG();
        }

        c->usage_count--;

        if (!c->usage_count) {
                list_del(&c->link);
                dma_ioc0_free_chunk(c);
        }

        spin_unlock_irqrestore(&r->chunk_list.lock, flags);
        DBG("%s: end\n", __func__);
        return 0;
}

/**
 * dma_sb_region_create_linear - Setup a linear dma mapping for a device.
 * @r: Pointer to a struct ps3_dma_region.
 *
 * This routine creates an HV dma region for the device and maps all available
 * ram into the io controller bus address space.
 */

static int dma_sb_region_create_linear(struct ps3_dma_region *r)
{
        int result;
        unsigned long virt_addr, len;
        dma_addr_t tmp;

        if (r->len > 16*1024*1024) {    /* FIXME: need proper fix */
                /* force 16M dma pages for linear mapping */
                if (r->page_size != PS3_DMA_16M) {
                        pr_info("%s:%d: forcing 16M pages for linear map\n",
                                __func__, __LINE__);
                        r->page_size = PS3_DMA_16M;
                        r->len = _ALIGN_UP(r->len, 1 << r->page_size);
                }
        }

        result = dma_sb_region_create(r);
        BUG_ON(result);

        if (r->offset < map.rm.size) {
                /* Map (part of) 1st RAM chunk */
                virt_addr = map.rm.base + r->offset;
                len = map.rm.size - r->offset;
                if (len > r->len)
                        len = r->len;
                result = dma_sb_map_area(r, virt_addr, len, &tmp,
                        CBE_IOPTE_PP_W | CBE_IOPTE_PP_R | CBE_IOPTE_SO_RW |
                        CBE_IOPTE_M);
                BUG_ON(result);
        }

        if (r->offset + r->len > map.rm.size) {
                /* Map (part of) 2nd RAM chunk */
                virt_addr = map.rm.size;
                len = r->len;
                if (r->offset >= map.rm.size)
                        virt_addr += r->offset - map.rm.size;
                else
                        len -= map.rm.size - r->offset;
                result = dma_sb_map_area(r, virt_addr, len, &tmp,
                        CBE_IOPTE_PP_W | CBE_IOPTE_PP_R | CBE_IOPTE_SO_RW |
                        CBE_IOPTE_M);
                BUG_ON(result);
        }

        return result;
}

/**
 * dma_sb_region_free_linear - Free a linear dma mapping for a device.
 * @r: Pointer to a struct ps3_dma_region.
 *
 * This routine will unmap all mapped areas and free the HV dma region.
 */

static int dma_sb_region_free_linear(struct ps3_dma_region *r)
{
        int result;
        dma_addr_t bus_addr;
        unsigned long len, lpar_addr;

        if (r->offset < map.rm.size) {
                /* Unmap (part of) 1st RAM chunk */
                lpar_addr = map.rm.base + r->offset;
                len = map.rm.size - r->offset;
                if (len > r->len)
                        len = r->len;
                bus_addr = dma_sb_lpar_to_bus(r, lpar_addr);
                result = dma_sb_unmap_area(r, bus_addr, len);
                BUG_ON(result);
        }

        if (r->offset + r->len > map.rm.size) {
                /* Unmap (part of) 2nd RAM chunk */
                lpar_addr = map.r1.base;
                len = r->len;
                if (r->offset >= map.rm.size)
                        lpar_addr += r->offset - map.rm.size;
                else
                        len -= map.rm.size - r->offset;
                bus_addr = dma_sb_lpar_to_bus(r, lpar_addr);
                result = dma_sb_unmap_area(r, bus_addr, len);
                BUG_ON(result);
        }

        result = dma_sb_region_free(r);
        BUG_ON(result);

        return result;
}

/**
 * dma_sb_map_area_linear - Map an area of memory into a device dma region.
 * @r: Pointer to a struct ps3_dma_region.
 * @virt_addr: Starting virtual address of the area to map.
 * @len: Length in bytes of the area to map.
 * @bus_addr: A pointer to return the starting ioc bus address of the area to
 * map.
 *
 * This routine just returns the corresponding bus address.  Actual mapping
 * occurs in dma_region_create_linear().
 */

static int dma_sb_map_area_linear(struct ps3_dma_region *r,
        unsigned long virt_addr, unsigned long len, dma_addr_t *bus_addr,
        u64 iopte_flag)
{
        unsigned long phys_addr = is_kernel_addr(virt_addr) ? __pa(virt_addr)
                : virt_addr;
        *bus_addr = dma_sb_lpar_to_bus(r, ps3_mm_phys_to_lpar(phys_addr));
        return 0;
}

/**
 * dma_unmap_area_linear - Unmap an area of memory from a device dma region.
 * @r: Pointer to a struct ps3_dma_region.
 * @bus_addr: The starting ioc bus address of the area to unmap.
 * @len: Length in bytes of the area to unmap.
 *
 * This routine does nothing.  Unmapping occurs in dma_sb_region_free_linear().
 */

static int dma_sb_unmap_area_linear(struct ps3_dma_region *r,
        dma_addr_t bus_addr, unsigned long len)
{
        return 0;
};

static const struct ps3_dma_region_ops ps3_dma_sb_region_ops =  {
        .create = dma_sb_region_create,
        .free = dma_sb_region_free,
        .map = dma_sb_map_area,
        .unmap = dma_sb_unmap_area
};

static const struct ps3_dma_region_ops ps3_dma_sb_region_linear_ops = {
        .create = dma_sb_region_create_linear,
        .free = dma_sb_region_free_linear,
        .map = dma_sb_map_area_linear,
        .unmap = dma_sb_unmap_area_linear
};

static const struct ps3_dma_region_ops ps3_dma_ioc0_region_ops = {
        .create = dma_ioc0_region_create,
        .free = dma_ioc0_region_free,
        .map = dma_ioc0_map_area,
        .unmap = dma_ioc0_unmap_area
};

int ps3_dma_region_init(struct ps3_system_bus_device *dev,
        struct ps3_dma_region *r, enum ps3_dma_page_size page_size,
        enum ps3_dma_region_type region_type, void *addr, unsigned long len)
{
        unsigned long lpar_addr;

        lpar_addr = addr ? ps3_mm_phys_to_lpar(__pa(addr)) : 0;

        r->dev = dev;
        r->page_size = page_size;
        r->region_type = region_type;
        r->offset = lpar_addr;
        if (r->offset >= map.rm.size)
                r->offset -= map.r1.offset;
        r->len = len ? len : _ALIGN_UP(map.total, 1 << r->page_size);

        switch (dev->dev_type) {
        case PS3_DEVICE_TYPE_SB:
                r->region_ops =  (USE_DYNAMIC_DMA)
                        ? &ps3_dma_sb_region_ops
                        : &ps3_dma_sb_region_linear_ops;
                break;
        case PS3_DEVICE_TYPE_IOC0:
                r->region_ops = &ps3_dma_ioc0_region_ops;
                break;
        default:
                BUG();
                return -EINVAL;
        }
        return 0;
}
EXPORT_SYMBOL(ps3_dma_region_init);

int ps3_dma_region_create(struct ps3_dma_region *r)
{
        BUG_ON(!r);
        BUG_ON(!r->region_ops);
        BUG_ON(!r->region_ops->create);
        return r->region_ops->create(r);
}
EXPORT_SYMBOL(ps3_dma_region_create);

int ps3_dma_region_free(struct ps3_dma_region *r)
{
        BUG_ON(!r);
        BUG_ON(!r->region_ops);
        BUG_ON(!r->region_ops->free);
        return r->region_ops->free(r);
}
EXPORT_SYMBOL(ps3_dma_region_free);

int ps3_dma_map(struct ps3_dma_region *r, unsigned long virt_addr,
        unsigned long len, dma_addr_t *bus_addr,
        u64 iopte_flag)
{
        return r->region_ops->map(r, virt_addr, len, bus_addr, iopte_flag);
}

int ps3_dma_unmap(struct ps3_dma_region *r, dma_addr_t bus_addr,
        unsigned long len)
{
        return r->region_ops->unmap(r, bus_addr, len);
}

/*============================================================================*/
/* system startup routines                                                    */
/*============================================================================*/

/**
 * ps3_mm_init - initialize the address space state variables
 */

void __init ps3_mm_init(void)
{
        int result;

        DBG(" -> %s:%d\n", __func__, __LINE__);

        result = ps3_repository_read_mm_info(&map.rm.base, &map.rm.size,
                &map.total);

        if (result)
                panic("ps3_repository_read_mm_info() failed");

        map.rm.offset = map.rm.base;
        map.vas_id = map.htab_size = 0;

        /* this implementation assumes map.rm.base is zero */

        BUG_ON(map.rm.base);
        BUG_ON(!map.rm.size);


        /* arrange to do this in ps3_mm_add_memory */
        ps3_mm_region_create(&map.r1, map.total - map.rm.size);

        /* correct map.total for the real total amount of memory we use */
        map.total = map.rm.size + map.r1.size;

        DBG(" <- %s:%d\n", __func__, __LINE__);
}

/**
 * ps3_mm_shutdown - final cleanup of address space
 */

void ps3_mm_shutdown(void)
{
        ps3_mm_region_destroy(&map.r1);
}