Staging: android: Remove pmem driver
Shuah Khan [Fri, 27 Jan 2012 18:40:10 +0000 (11:40 -0700)]
Addroid pmem driver is no longer used in any of the Android products.
This patch removes pmem driver from Android staging area

Reference: https://lkml.org/lkml/2012/1/23/183

Signed-off-by: Shuah Khan <shuahkhan@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/android/Kconfig
drivers/staging/android/Makefile
drivers/staging/android/android_pmem.h [deleted file]
drivers/staging/android/pmem.c [deleted file]

index becf711..94cb2ac 100644 (file)
@@ -99,10 +99,6 @@ config ANDROID_LOW_MEMORY_KILLER
        ---help---
          Register processes to be killed when memory is low
 
-config ANDROID_PMEM
-       bool "Android pmem allocator"
-       depends on ARM
-
 source "drivers/staging/android/switch/Kconfig"
 
 endif # if ANDROID
index eaed1ff..5fcc24f 100644 (file)
@@ -5,5 +5,4 @@ obj-$(CONFIG_ANDROID_RAM_CONSOLE)       += ram_console.o
 obj-$(CONFIG_ANDROID_TIMED_OUTPUT)     += timed_output.o
 obj-$(CONFIG_ANDROID_TIMED_GPIO)       += timed_gpio.o
 obj-$(CONFIG_ANDROID_LOW_MEMORY_KILLER)        += lowmemorykiller.o
-obj-$(CONFIG_ANDROID_PMEM)             += pmem.o
 obj-$(CONFIG_ANDROID_SWITCH)           += switch/
diff --git a/drivers/staging/android/android_pmem.h b/drivers/staging/android/android_pmem.h
deleted file mode 100644 (file)
index f633621..0000000
+++ /dev/null
@@ -1,93 +0,0 @@
-/* include/linux/android_pmem.h
- *
- * Copyright (C) 2007 Google, Inc.
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * 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.
- *
- */
-
-#ifndef _ANDROID_PMEM_H_
-#define _ANDROID_PMEM_H_
-
-#define PMEM_IOCTL_MAGIC 'p'
-#define PMEM_GET_PHYS          _IOW(PMEM_IOCTL_MAGIC, 1, unsigned int)
-#define PMEM_MAP               _IOW(PMEM_IOCTL_MAGIC, 2, unsigned int)
-#define PMEM_GET_SIZE          _IOW(PMEM_IOCTL_MAGIC, 3, unsigned int)
-#define PMEM_UNMAP             _IOW(PMEM_IOCTL_MAGIC, 4, unsigned int)
-/* This ioctl will allocate pmem space, backing the file, it will fail
- * if the file already has an allocation, pass it the len as the argument
- * to the ioctl */
-#define PMEM_ALLOCATE          _IOW(PMEM_IOCTL_MAGIC, 5, unsigned int)
-/* This will connect a one pmem file to another, pass the file that is already
- * backed in memory as the argument to the ioctl
- */
-#define PMEM_CONNECT           _IOW(PMEM_IOCTL_MAGIC, 6, unsigned int)
-/* Returns the total size of the pmem region it is sent to as a pmem_region
- * struct (with offset set to 0). 
- */
-#define PMEM_GET_TOTAL_SIZE    _IOW(PMEM_IOCTL_MAGIC, 7, unsigned int)
-#define PMEM_CACHE_FLUSH       _IOW(PMEM_IOCTL_MAGIC, 8, unsigned int)
-
-struct android_pmem_platform_data
-{
-       const char* name;
-       /* starting physical address of memory region */
-       unsigned long start;
-       /* size of memory region */
-       unsigned long size;
-       /* set to indicate the region should not be managed with an allocator */
-       unsigned no_allocator;
-       /* set to indicate maps of this region should be cached, if a mix of
-        * cached and uncached is desired, set this and open the device with
-        * O_SYNC to get an uncached region */
-       unsigned cached;
-       /* The MSM7k has bits to enable a write buffer in the bus controller*/
-       unsigned buffered;
-};
-
-struct pmem_region {
-       unsigned long offset;
-       unsigned long len;
-};
-
-#ifdef CONFIG_ANDROID_PMEM
-int is_pmem_file(struct file *file);
-int get_pmem_file(int fd, unsigned long *start, unsigned long *vstart,
-                 unsigned long *end, struct file **filp);
-int get_pmem_user_addr(struct file *file, unsigned long *start,
-                      unsigned long *end);
-void put_pmem_file(struct file* file);
-void flush_pmem_file(struct file *file, unsigned long start, unsigned long len);
-int pmem_setup(struct android_pmem_platform_data *pdata,
-              long (*ioctl)(struct file *, unsigned int, unsigned long),
-              int (*release)(struct inode *, struct file *));
-int pmem_remap(struct pmem_region *region, struct file *file,
-              unsigned operation);
-
-#else
-static inline int is_pmem_file(struct file *file) { return 0; }
-static inline int get_pmem_file(int fd, unsigned long *start,
-                               unsigned long *vstart, unsigned long *end,
-                               struct file **filp) { return -ENOSYS; }
-static inline int get_pmem_user_addr(struct file *file, unsigned long *start,
-                                    unsigned long *end) { return -ENOSYS; }
-static inline void put_pmem_file(struct file* file) { return; }
-static inline void flush_pmem_file(struct file *file, unsigned long start,
-                                  unsigned long len) { return; }
-static inline int pmem_setup(struct android_pmem_platform_data *pdata,
-             long (*ioctl)(struct file *, unsigned int, unsigned long),
-             int (*release)(struct inode *, struct file *)) { return -ENOSYS; }
-
-static inline int pmem_remap(struct pmem_region *region, struct file *file,
-                            unsigned operation) { return -ENOSYS; }
-#endif
-
-#endif //_ANDROID_PPP_H_
-
diff --git a/drivers/staging/android/pmem.c b/drivers/staging/android/pmem.c
deleted file mode 100644 (file)
index 7d97032..0000000
+++ /dev/null
@@ -1,1345 +0,0 @@
-/* pmem.c
- *
- * Copyright (C) 2007 Google, Inc.
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * 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.
- *
- */
-
-#include <linux/miscdevice.h>
-#include <linux/platform_device.h>
-#include <linux/fs.h>
-#include <linux/file.h>
-#include <linux/mm.h>
-#include <linux/list.h>
-#include <linux/mutex.h>
-#include <linux/debugfs.h>
-#include <linux/mempolicy.h>
-#include <linux/sched.h>
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <asm/cacheflush.h>
-#include "android_pmem.h"
-
-#define PMEM_MAX_DEVICES 10
-#define PMEM_MAX_ORDER 128
-#define PMEM_MIN_ALLOC PAGE_SIZE
-
-#define PMEM_DEBUG 1
-
-/* indicates that a refernce to this file has been taken via get_pmem_file,
- * the file should not be released until put_pmem_file is called */
-#define PMEM_FLAGS_BUSY 0x1
-/* indicates that this is a suballocation of a larger master range */
-#define PMEM_FLAGS_CONNECTED 0x1 << 1
-/* indicates this is a master and not a sub allocation and that it is mmaped */
-#define PMEM_FLAGS_MASTERMAP 0x1 << 2
-/* submap and unsubmap flags indicate:
- * 00: subregion has never been mmaped
- * 10: subregion has been mmaped, reference to the mm was taken
- * 11: subretion has ben released, refernece to the mm still held
- * 01: subretion has been released, reference to the mm has been released
- */
-#define PMEM_FLAGS_SUBMAP 0x1 << 3
-#define PMEM_FLAGS_UNSUBMAP 0x1 << 4
-
-
-struct pmem_data {
-       /* in alloc mode: an index into the bitmap
-        * in no_alloc mode: the size of the allocation */
-       int index;
-       /* see flags above for descriptions */
-       unsigned int flags;
-       /* protects this data field, if the mm_mmap sem will be held at the
-        * same time as this sem, the mm sem must be taken first (as this is
-        * the order for vma_open and vma_close ops */
-       struct rw_semaphore sem;
-       /* info about the mmaping process */
-       struct vm_area_struct *vma;
-       /* task struct of the mapping process */
-       struct task_struct *task;
-       /* process id of teh mapping process */
-       pid_t pid;
-       /* file descriptor of the master */
-       int master_fd;
-       /* file struct of the master */
-       struct file *master_file;
-       /* a list of currently available regions if this is a suballocation */
-       struct list_head region_list;
-       /* a linked list of data so we can access them for debugging */
-       struct list_head list;
-#if PMEM_DEBUG
-       int ref;
-#endif
-};
-
-struct pmem_bits {
-       unsigned allocated:1;           /* 1 if allocated, 0 if free */
-       unsigned order:7;               /* size of the region in pmem space */
-};
-
-struct pmem_region_node {
-       struct pmem_region region;
-       struct list_head list;
-};
-
-#define PMEM_DEBUG_MSGS 0
-#if PMEM_DEBUG_MSGS
-#define DLOG(fmt,args...) \
-       do { printk(KERN_INFO "[%s:%s:%d] "fmt, __FILE__, __func__, __LINE__, \
-                   ##args); } \
-       while (0)
-#else
-#define DLOG(x...) do {} while (0)
-#endif
-
-struct pmem_info {
-       struct miscdevice dev;
-       /* physical start address of the remaped pmem space */
-       unsigned long base;
-       /* vitual start address of the remaped pmem space */
-       unsigned char __iomem *vbase;
-       /* total size of the pmem space */
-       unsigned long size;
-       /* number of entries in the pmem space */
-       unsigned long num_entries;
-       /* pfn of the garbage page in memory */
-       unsigned long garbage_pfn;
-       /* index of the garbage page in the pmem space */
-       int garbage_index;
-       /* the bitmap for the region indicating which entries are allocated
-        * and which are free */
-       struct pmem_bits *bitmap;
-       /* indicates the region should not be managed with an allocator */
-       unsigned no_allocator;
-       /* indicates maps of this region should be cached, if a mix of
-        * cached and uncached is desired, set this and open the device with
-        * O_SYNC to get an uncached region */
-       unsigned cached;
-       unsigned buffered;
-       /* in no_allocator mode the first mapper gets the whole space and sets
-        * this flag */
-       unsigned allocated;
-       /* for debugging, creates a list of pmem file structs, the
-        * data_list_lock should be taken before pmem_data->sem if both are
-        * needed */
-       struct mutex data_list_lock;
-       struct list_head data_list;
-       /* pmem_sem protects the bitmap array
-        * a write lock should be held when modifying entries in bitmap
-        * a read lock should be held when reading data from bits or
-        * dereferencing a pointer into bitmap
-        *
-        * pmem_data->sem protects the pmem data of a particular file
-        * Many of the function that require the pmem_data->sem have a non-
-        * locking version for when the caller is already holding that sem.
-        *
-        * IF YOU TAKE BOTH LOCKS TAKE THEM IN THIS ORDER:
-        * down(pmem_data->sem) => down(bitmap_sem)
-        */
-       struct rw_semaphore bitmap_sem;
-
-       long (*ioctl)(struct file *, unsigned int, unsigned long);
-       int (*release)(struct inode *, struct file *);
-};
-
-static struct pmem_info pmem[PMEM_MAX_DEVICES];
-static int id_count;
-
-#define PMEM_IS_FREE(id, index) !(pmem[id].bitmap[index].allocated)
-#define PMEM_ORDER(id, index) pmem[id].bitmap[index].order
-#define PMEM_BUDDY_INDEX(id, index) (index ^ (1 << PMEM_ORDER(id, index)))
-#define PMEM_NEXT_INDEX(id, index) (index + (1 << PMEM_ORDER(id, index)))
-#define PMEM_OFFSET(index) (index * PMEM_MIN_ALLOC)
-#define PMEM_START_ADDR(id, index) (PMEM_OFFSET(index) + pmem[id].base)
-#define PMEM_LEN(id, index) ((1 << PMEM_ORDER(id, index)) * PMEM_MIN_ALLOC)
-#define PMEM_END_ADDR(id, index) (PMEM_START_ADDR(id, index) + \
-       PMEM_LEN(id, index))
-#define PMEM_START_VADDR(id, index) (PMEM_OFFSET(id, index) + pmem[id].vbase)
-#define PMEM_END_VADDR(id, index) (PMEM_START_VADDR(id, index) + \
-       PMEM_LEN(id, index))
-#define PMEM_REVOKED(data) (data->flags & PMEM_FLAGS_REVOKED)
-#define PMEM_IS_PAGE_ALIGNED(addr) (!((addr) & (~PAGE_MASK)))
-#define PMEM_IS_SUBMAP(data) ((data->flags & PMEM_FLAGS_SUBMAP) && \
-       (!(data->flags & PMEM_FLAGS_UNSUBMAP)))
-
-static int pmem_release(struct inode *, struct file *);
-static int pmem_mmap(struct file *, struct vm_area_struct *);
-static int pmem_open(struct inode *, struct file *);
-static long pmem_ioctl(struct file *, unsigned int, unsigned long);
-
-struct file_operations pmem_fops = {
-       .release = pmem_release,
-       .mmap = pmem_mmap,
-       .open = pmem_open,
-       .unlocked_ioctl = pmem_ioctl,
-};
-
-static int get_id(struct file *file)
-{
-       return MINOR(file->f_dentry->d_inode->i_rdev);
-}
-
-int is_pmem_file(struct file *file)
-{
-       int id;
-
-       if (unlikely(!file || !file->f_dentry || !file->f_dentry->d_inode))
-               return 0;
-       id = get_id(file);
-       if (unlikely(id >= PMEM_MAX_DEVICES))
-               return 0;
-       if (unlikely(file->f_dentry->d_inode->i_rdev !=
-            MKDEV(MISC_MAJOR, pmem[id].dev.minor)))
-               return 0;
-       return 1;
-}
-
-static int has_allocation(struct file *file)
-{
-       struct pmem_data *data;
-       /* check is_pmem_file first if not accessed via pmem_file_ops */
-
-       if (unlikely(!file->private_data))
-               return 0;
-       data = (struct pmem_data *)file->private_data;
-       if (unlikely(data->index < 0))
-               return 0;
-       return 1;
-}
-
-static int is_master_owner(struct file *file)
-{
-       struct file *master_file;
-       struct pmem_data *data;
-       int put_needed, ret = 0;
-
-       if (!is_pmem_file(file) || !has_allocation(file))
-               return 0;
-       data = (struct pmem_data *)file->private_data;
-       if (PMEM_FLAGS_MASTERMAP & data->flags)
-               return 1;
-       master_file = fget_light(data->master_fd, &put_needed);
-       if (master_file && data->master_file == master_file)
-               ret = 1;
-       fput_light(master_file, put_needed);
-       return ret;
-}
-
-static int pmem_free(int id, int index)
-{
-       /* caller should hold the write lock on pmem_sem! */
-       int buddy, curr = index;
-       DLOG("index %d\n", index);
-
-       if (pmem[id].no_allocator) {
-               pmem[id].allocated = 0;
-               return 0;
-       }
-       /* clean up the bitmap, merging any buddies */
-       pmem[id].bitmap[curr].allocated = 0;
-       /* find a slots buddy Buddy# = Slot# ^ (1 << order)
-        * if the buddy is also free merge them
-        * repeat until the buddy is not free or end of the bitmap is reached
-        */
-       do {
-               buddy = PMEM_BUDDY_INDEX(id, curr);
-               if (PMEM_IS_FREE(id, buddy) &&
-                               PMEM_ORDER(id, buddy) == PMEM_ORDER(id, curr)) {
-                       PMEM_ORDER(id, buddy)++;
-                       PMEM_ORDER(id, curr)++;
-                       curr = min(buddy, curr);
-               } else {
-                       break;
-               }
-       } while (curr < pmem[id].num_entries);
-
-       return 0;
-}
-
-static void pmem_revoke(struct file *file, struct pmem_data *data);
-
-static int pmem_release(struct inode *inode, struct file *file)
-{
-       struct pmem_data *data = (struct pmem_data *)file->private_data;
-       struct pmem_region_node *region_node;
-       struct list_head *elt, *elt2;
-       int id = get_id(file), ret = 0;
-
-
-       mutex_lock(&pmem[id].data_list_lock);
-       /* if this file is a master, revoke all the memory in the connected
-        *  files */
-       if (PMEM_FLAGS_MASTERMAP & data->flags) {
-               struct pmem_data *sub_data;
-               list_for_each(elt, &pmem[id].data_list) {
-                       sub_data = list_entry(elt, struct pmem_data, list);
-                       down_read(&sub_data->sem);
-                       if (PMEM_IS_SUBMAP(sub_data) &&
-                           file == sub_data->master_file) {
-                               up_read(&sub_data->sem);
-                               pmem_revoke(file, sub_data);
-                       }  else
-                               up_read(&sub_data->sem);
-               }
-       }
-       list_del(&data->list);
-       mutex_unlock(&pmem[id].data_list_lock);
-
-
-       down_write(&data->sem);
-
-       /* if its not a conencted file and it has an allocation, free it */
-       if (!(PMEM_FLAGS_CONNECTED & data->flags) && has_allocation(file)) {
-               down_write(&pmem[id].bitmap_sem);
-               ret = pmem_free(id, data->index);
-               up_write(&pmem[id].bitmap_sem);
-       }
-
-       /* if this file is a submap (mapped, connected file), downref the
-        * task struct */
-       if (PMEM_FLAGS_SUBMAP & data->flags)
-               if (data->task) {
-                       put_task_struct(data->task);
-                       data->task = NULL;
-               }
-
-       file->private_data = NULL;
-
-       list_for_each_safe(elt, elt2, &data->region_list) {
-               region_node = list_entry(elt, struct pmem_region_node, list);
-               list_del(elt);
-               kfree(region_node);
-       }
-       BUG_ON(!list_empty(&data->region_list));
-
-       up_write(&data->sem);
-       kfree(data);
-       if (pmem[id].release)
-               ret = pmem[id].release(inode, file);
-
-       return ret;
-}
-
-static int pmem_open(struct inode *inode, struct file *file)
-{
-       struct pmem_data *data;
-       int id = get_id(file);
-       int ret = 0;
-
-       DLOG("current %u file %p(%d)\n", current->pid, file, file_count(file));
-       /* setup file->private_data to indicate its unmapped */
-       /*  you can only open a pmem device one time */
-       if (file->private_data != NULL)
-               return -1;
-       data = kmalloc(sizeof(struct pmem_data), GFP_KERNEL);
-       if (!data) {
-               printk("pmem: unable to allocate memory for pmem metadata.");
-               return -1;
-       }
-       data->flags = 0;
-       data->index = -1;
-       data->task = NULL;
-       data->vma = NULL;
-       data->pid = 0;
-       data->master_file = NULL;
-#if PMEM_DEBUG
-       data->ref = 0;
-#endif
-       INIT_LIST_HEAD(&data->region_list);
-       init_rwsem(&data->sem);
-
-       file->private_data = data;
-       INIT_LIST_HEAD(&data->list);
-
-       mutex_lock(&pmem[id].data_list_lock);
-       list_add(&data->list, &pmem[id].data_list);
-       mutex_unlock(&pmem[id].data_list_lock);
-       return ret;
-}
-
-static unsigned long pmem_order(unsigned long len)
-{
-       int i;
-
-       len = (len + PMEM_MIN_ALLOC - 1)/PMEM_MIN_ALLOC;
-       len--;
-       for (i = 0; i < sizeof(len)*8; i++)
-               if (len >> i == 0)
-                       break;
-       return i;
-}
-
-static int pmem_allocate(int id, unsigned long len)
-{
-       /* caller should hold the write lock on pmem_sem! */
-       /* return the corresponding pdata[] entry */
-       int curr = 0;
-       int end = pmem[id].num_entries;
-       int best_fit = -1;
-       unsigned long order = pmem_order(len);
-
-       if (pmem[id].no_allocator) {
-               DLOG("no allocator");
-               if ((len > pmem[id].size) || pmem[id].allocated)
-                       return -1;
-               pmem[id].allocated = 1;
-               return len;
-       }
-
-       if (order > PMEM_MAX_ORDER)
-               return -1;
-       DLOG("order %lx\n", order);
-
-       /* look through the bitmap:
-        *      if you find a free slot of the correct order use it
-        *      otherwise, use the best fit (smallest with size > order) slot
-        */
-       while (curr < end) {
-               if (PMEM_IS_FREE(id, curr)) {
-                       if (PMEM_ORDER(id, curr) == (unsigned char)order) {
-                               /* set the not free bit and clear others */
-                               best_fit = curr;
-                               break;
-                       }
-                       if (PMEM_ORDER(id, curr) > (unsigned char)order &&
-                           (best_fit < 0 ||
-                            PMEM_ORDER(id, curr) < PMEM_ORDER(id, best_fit)))
-                               best_fit = curr;
-               }
-               curr = PMEM_NEXT_INDEX(id, curr);
-       }
-
-       /* if best_fit < 0, there are no suitable slots,
-        * return an error
-        */
-       if (best_fit < 0) {
-               printk("pmem: no space left to allocate!\n");
-               return -1;
-       }
-
-       /* now partition the best fit:
-        *      split the slot into 2 buddies of order - 1
-        *      repeat until the slot is of the correct order
-        */
-       while (PMEM_ORDER(id, best_fit) > (unsigned char)order) {
-               int buddy;
-               PMEM_ORDER(id, best_fit) -= 1;
-               buddy = PMEM_BUDDY_INDEX(id, best_fit);
-               PMEM_ORDER(id, buddy) = PMEM_ORDER(id, best_fit);
-       }
-       pmem[id].bitmap[best_fit].allocated = 1;
-       return best_fit;
-}
-
-static pgprot_t pmem_access_prot(struct file *file, pgprot_t vma_prot)
-{
-       int id = get_id(file);
-#ifdef pgprot_noncached
-       if (pmem[id].cached == 0 || file->f_flags & O_SYNC)
-               return pgprot_noncached(vma_prot);
-#endif
-#ifdef pgprot_ext_buffered
-       else if (pmem[id].buffered)
-               return pgprot_ext_buffered(vma_prot);
-#endif
-       return vma_prot;
-}
-
-static unsigned long pmem_start_addr(int id, struct pmem_data *data)
-{
-       if (pmem[id].no_allocator)
-               return PMEM_START_ADDR(id, 0);
-       else
-               return PMEM_START_ADDR(id, data->index);
-
-}
-
-static void *pmem_start_vaddr(int id, struct pmem_data *data)
-{
-       return pmem_start_addr(id, data) - pmem[id].base + pmem[id].vbase;
-}
-
-static unsigned long pmem_len(int id, struct pmem_data *data)
-{
-       if (pmem[id].no_allocator)
-               return data->index;
-       else
-               return PMEM_LEN(id, data->index);
-}
-
-static int pmem_map_garbage(int id, struct vm_area_struct *vma,
-                           struct pmem_data *data, unsigned long offset,
-                           unsigned long len)
-{
-       int i, garbage_pages = len >> PAGE_SHIFT;
-
-       vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP | VM_SHARED | VM_WRITE;
-       for (i = 0; i < garbage_pages; i++) {
-               if (vm_insert_pfn(vma, vma->vm_start + offset + (i * PAGE_SIZE),
-                   pmem[id].garbage_pfn))
-                       return -EAGAIN;
-       }
-       return 0;
-}
-
-static int pmem_unmap_pfn_range(int id, struct vm_area_struct *vma,
-                               struct pmem_data *data, unsigned long offset,
-                               unsigned long len)
-{
-       int garbage_pages;
-       DLOG("unmap offset %lx len %lx\n", offset, len);
-
-       BUG_ON(!PMEM_IS_PAGE_ALIGNED(len));
-
-       garbage_pages = len >> PAGE_SHIFT;
-       zap_page_range(vma, vma->vm_start + offset, len, NULL);
-       pmem_map_garbage(id, vma, data, offset, len);
-       return 0;
-}
-
-static int pmem_map_pfn_range(int id, struct vm_area_struct *vma,
-                             struct pmem_data *data, unsigned long offset,
-                             unsigned long len)
-{
-       DLOG("map offset %lx len %lx\n", offset, len);
-       BUG_ON(!PMEM_IS_PAGE_ALIGNED(vma->vm_start));
-       BUG_ON(!PMEM_IS_PAGE_ALIGNED(vma->vm_end));
-       BUG_ON(!PMEM_IS_PAGE_ALIGNED(len));
-       BUG_ON(!PMEM_IS_PAGE_ALIGNED(offset));
-
-       if (io_remap_pfn_range(vma, vma->vm_start + offset,
-               (pmem_start_addr(id, data) + offset) >> PAGE_SHIFT,
-               len, vma->vm_page_prot)) {
-               return -EAGAIN;
-       }
-       return 0;
-}
-
-static int pmem_remap_pfn_range(int id, struct vm_area_struct *vma,
-                             struct pmem_data *data, unsigned long offset,
-                             unsigned long len)
-{
-       /* hold the mm semp for the vma you are modifying when you call this */
-       BUG_ON(!vma);
-       zap_page_range(vma, vma->vm_start + offset, len, NULL);
-       return pmem_map_pfn_range(id, vma, data, offset, len);
-}
-
-static void pmem_vma_open(struct vm_area_struct *vma)
-{
-       struct file *file = vma->vm_file;
-       struct pmem_data *data = file->private_data;
-       int id = get_id(file);
-       /* this should never be called as we don't support copying pmem
-        * ranges via fork */
-       BUG_ON(!has_allocation(file));
-       down_write(&data->sem);
-       /* remap the garbage pages, forkers don't get access to the data */
-       pmem_unmap_pfn_range(id, vma, data, 0, vma->vm_start - vma->vm_end);
-       up_write(&data->sem);
-}
-
-static void pmem_vma_close(struct vm_area_struct *vma)
-{
-       struct file *file = vma->vm_file;
-       struct pmem_data *data = file->private_data;
-
-       DLOG("current %u ppid %u file %p count %d\n", current->pid,
-            current->parent->pid, file, file_count(file));
-       if (unlikely(!is_pmem_file(file) || !has_allocation(file))) {
-               printk(KERN_WARNING "pmem: something is very wrong, you are "
-                      "closing a vm backing an allocation that doesn't "
-                      "exist!\n");
-               return;
-       }
-       down_write(&data->sem);
-       if (data->vma == vma) {
-               data->vma = NULL;
-               if ((data->flags & PMEM_FLAGS_CONNECTED) &&
-                   (data->flags & PMEM_FLAGS_SUBMAP))
-                       data->flags |= PMEM_FLAGS_UNSUBMAP;
-       }
-       /* the kernel is going to free this vma now anyway */
-       up_write(&data->sem);
-}
-
-static struct vm_operations_struct vm_ops = {
-       .open = pmem_vma_open,
-       .close = pmem_vma_close,
-};
-
-static int pmem_mmap(struct file *file, struct vm_area_struct *vma)
-{
-       struct pmem_data *data;
-       int index;
-       unsigned long vma_size =  vma->vm_end - vma->vm_start;
-       int ret = 0, id = get_id(file);
-
-       if (vma->vm_pgoff || !PMEM_IS_PAGE_ALIGNED(vma_size)) {
-#if PMEM_DEBUG
-               printk(KERN_ERR "pmem: mmaps must be at offset zero, aligned"
-                               " and a multiple of pages_size.\n");
-#endif
-               return -EINVAL;
-       }
-
-       data = (struct pmem_data *)file->private_data;
-       down_write(&data->sem);
-       /* check this file isn't already mmaped, for submaps check this file
-        * has never been mmaped */
-       if ((data->flags & PMEM_FLAGS_SUBMAP) ||
-           (data->flags & PMEM_FLAGS_UNSUBMAP)) {
-#if PMEM_DEBUG
-               printk(KERN_ERR "pmem: you can only mmap a pmem file once, "
-                      "this file is already mmaped. %x\n", data->flags);
-#endif
-               ret = -EINVAL;
-               goto error;
-       }
-       /* if file->private_data == unalloced, alloc*/
-       if (data && data->index == -1) {
-               down_write(&pmem[id].bitmap_sem);
-               index = pmem_allocate(id, vma->vm_end - vma->vm_start);
-               up_write(&pmem[id].bitmap_sem);
-               data->index = index;
-       }
-       /* either no space was available or an error occured */
-       if (!has_allocation(file)) {
-               ret = -EINVAL;
-               printk("pmem: could not find allocation for map.\n");
-               goto error;
-       }
-
-       if (pmem_len(id, data) < vma_size) {
-#if PMEM_DEBUG
-               printk(KERN_WARNING "pmem: mmap size [%lu] does not match"
-                      "size of backing region [%lu].\n", vma_size,
-                      pmem_len(id, data));
-#endif
-               ret = -EINVAL;
-               goto error;
-       }
-
-       vma->vm_pgoff = pmem_start_addr(id, data) >> PAGE_SHIFT;
-       vma->vm_page_prot = pmem_access_prot(file, vma->vm_page_prot);
-
-       if (data->flags & PMEM_FLAGS_CONNECTED) {
-               struct pmem_region_node *region_node;
-               struct list_head *elt;
-               if (pmem_map_garbage(id, vma, data, 0, vma_size)) {
-                       printk("pmem: mmap failed in kernel!\n");
-                       ret = -EAGAIN;
-                       goto error;
-               }
-               list_for_each(elt, &data->region_list) {
-                       region_node = list_entry(elt, struct pmem_region_node,
-                                                list);
-                       DLOG("remapping file: %p %lx %lx\n", file,
-                               region_node->region.offset,
-                               region_node->region.len);
-                       if (pmem_remap_pfn_range(id, vma, data,
-                                                region_node->region.offset,
-                                                region_node->region.len)) {
-                               ret = -EAGAIN;
-                               goto error;
-                       }
-               }
-               data->flags |= PMEM_FLAGS_SUBMAP;
-               get_task_struct(current->group_leader);
-               data->task = current->group_leader;
-               data->vma = vma;
-#if PMEM_DEBUG
-               data->pid = current->pid;
-#endif
-               DLOG("submmapped file %p vma %p pid %u\n", file, vma,
-                    current->pid);
-       } else {
-               if (pmem_map_pfn_range(id, vma, data, 0, vma_size)) {
-                       printk(KERN_INFO "pmem: mmap failed in kernel!\n");
-                       ret = -EAGAIN;
-                       goto error;
-               }
-               data->flags |= PMEM_FLAGS_MASTERMAP;
-               data->pid = current->pid;
-       }
-       vma->vm_ops = &vm_ops;
-error:
-       up_write(&data->sem);
-       return ret;
-}
-
-/* the following are the api for accessing pmem regions by other drivers
- * from inside the kernel */
-int get_pmem_user_addr(struct file *file, unsigned long *start,
-                  unsigned long *len)
-{
-       struct pmem_data *data;
-       if (!is_pmem_file(file) || !has_allocation(file)) {
-#if PMEM_DEBUG
-               printk(KERN_INFO "pmem: requested pmem data from invalid"
-                                 "file.\n");
-#endif
-               return -1;
-       }
-       data = (struct pmem_data *)file->private_data;
-       down_read(&data->sem);
-       if (data->vma) {
-               *start = data->vma->vm_start;
-               *len = data->vma->vm_end - data->vma->vm_start;
-       } else {
-               *start = 0;
-               *len = 0;
-       }
-       up_read(&data->sem);
-       return 0;
-}
-
-int get_pmem_addr(struct file *file, unsigned long *start,
-                 unsigned long *vstart, unsigned long *len)
-{
-       struct pmem_data *data;
-       int id;
-
-       if (!is_pmem_file(file) || !has_allocation(file)) {
-               return -1;
-       }
-
-       data = (struct pmem_data *)file->private_data;
-       if (data->index == -1) {
-#if PMEM_DEBUG
-               printk(KERN_INFO "pmem: requested pmem data from file with no "
-                      "allocation.\n");
-               return -1;
-#endif
-       }
-       id = get_id(file);
-
-       down_read(&data->sem);
-       *start = pmem_start_addr(id, data);
-       *len = pmem_len(id, data);
-       *vstart = (unsigned long)pmem_start_vaddr(id, data);
-       up_read(&data->sem);
-#if PMEM_DEBUG
-       down_write(&data->sem);
-       data->ref++;
-       up_write(&data->sem);
-#endif
-       return 0;
-}
-
-int get_pmem_file(int fd, unsigned long *start, unsigned long *vstart,
-                 unsigned long *len, struct file **filp)
-{
-       struct file *file;
-
-       file = fget(fd);
-       if (unlikely(file == NULL)) {
-               printk(KERN_INFO "pmem: requested data from file descriptor "
-                      "that doesn't exist.");
-               return -1;
-       }
-
-       if (get_pmem_addr(file, start, vstart, len))
-               goto end;
-
-       if (filp)
-               *filp = file;
-       return 0;
-end:
-       fput(file);
-       return -1;
-}
-
-void put_pmem_file(struct file *file)
-{
-       struct pmem_data *data;
-       int id;
-
-       if (!is_pmem_file(file))
-               return;
-       id = get_id(file);
-       data = (struct pmem_data *)file->private_data;
-#if PMEM_DEBUG
-       down_write(&data->sem);
-       if (data->ref == 0) {
-               printk("pmem: pmem_put > pmem_get %s (pid %d)\n",
-                      pmem[id].dev.name, data->pid);
-               BUG();
-       }
-       data->ref--;
-       up_write(&data->sem);
-#endif
-       fput(file);
-}
-
-void flush_pmem_file(struct file *file, unsigned long offset, unsigned long len)
-{
-       struct pmem_data *data;
-       int id;
-       void *vaddr;
-       struct pmem_region_node *region_node;
-       struct list_head *elt;
-       void *flush_start, *flush_end;
-
-       if (!is_pmem_file(file) || !has_allocation(file)) {
-               return;
-       }
-
-       id = get_id(file);
-       data = (struct pmem_data *)file->private_data;
-       if (!pmem[id].cached || file->f_flags & O_SYNC)
-               return;
-
-       down_read(&data->sem);
-       vaddr = pmem_start_vaddr(id, data);
-       /* if this isn't a submmapped file, flush the whole thing */
-       if (unlikely(!(data->flags & PMEM_FLAGS_CONNECTED))) {
-               dmac_flush_range(vaddr, vaddr + pmem_len(id, data));
-               goto end;
-       }
-       /* otherwise, flush the region of the file we are drawing */
-       list_for_each(elt, &data->region_list) {
-               region_node = list_entry(elt, struct pmem_region_node, list);
-               if ((offset >= region_node->region.offset) &&
-                   ((offset + len) <= (region_node->region.offset +
-                       region_node->region.len))) {
-                       flush_start = vaddr + region_node->region.offset;
-                       flush_end = flush_start + region_node->region.len;
-                       dmac_flush_range(flush_start, flush_end);
-                       break;
-               }
-       }
-end:
-       up_read(&data->sem);
-}
-
-static int pmem_connect(unsigned long connect, struct file *file)
-{
-       struct pmem_data *data = (struct pmem_data *)file->private_data;
-       struct pmem_data *src_data;
-       struct file *src_file;
-       int ret = 0, put_needed;
-
-       down_write(&data->sem);
-       /* retrieve the src file and check it is a pmem file with an alloc */
-       src_file = fget_light(connect, &put_needed);
-       DLOG("connect %p to %p\n", file, src_file);
-       if (!src_file) {
-               printk("pmem: src file not found!\n");
-               ret = -EINVAL;
-               goto err_no_file;
-       }
-       if (unlikely(!is_pmem_file(src_file) || !has_allocation(src_file))) {
-               printk(KERN_INFO "pmem: src file is not a pmem file or has no "
-                      "alloc!\n");
-               ret = -EINVAL;
-               goto err_bad_file;
-       }
-       src_data = (struct pmem_data *)src_file->private_data;
-
-       if (has_allocation(file) && (data->index != src_data->index)) {
-               printk("pmem: file is already mapped but doesn't match this"
-                      " src_file!\n");
-               ret = -EINVAL;
-               goto err_bad_file;
-       }
-       data->index = src_data->index;
-       data->flags |= PMEM_FLAGS_CONNECTED;
-       data->master_fd = connect;
-       data->master_file = src_file;
-
-err_bad_file:
-       fput_light(src_file, put_needed);
-err_no_file:
-       up_write(&data->sem);
-       return ret;
-}
-
-static void pmem_unlock_data_and_mm(struct pmem_data *data,
-                                   struct mm_struct *mm)
-{
-       up_write(&data->sem);
-       if (mm != NULL) {
-               up_write(&mm->mmap_sem);
-               mmput(mm);
-       }
-}
-
-static int pmem_lock_data_and_mm(struct file *file, struct pmem_data *data,
-                                struct mm_struct **locked_mm)
-{
-       int ret = 0;
-       struct mm_struct *mm = NULL;
-       *locked_mm = NULL;
-lock_mm:
-       down_read(&data->sem);
-       if (PMEM_IS_SUBMAP(data)) {
-               mm = get_task_mm(data->task);
-               if (!mm) {
-#if PMEM_DEBUG
-                       printk("pmem: can't remap task is gone!\n");
-#endif
-                       up_read(&data->sem);
-                       return -1;
-               }
-       }
-       up_read(&data->sem);
-
-       if (mm)
-               down_write(&mm->mmap_sem);
-
-       down_write(&data->sem);
-       /* check that the file didn't get mmaped before we could take the
-        * data sem, this should be safe b/c you can only submap each file
-        * once */
-       if (PMEM_IS_SUBMAP(data) && !mm) {
-               pmem_unlock_data_and_mm(data, mm);
-               up_write(&data->sem);
-               goto lock_mm;
-       }
-       /* now check that vma.mm is still there, it could have been
-        * deleted by vma_close before we could get the data->sem */
-       if ((data->flags & PMEM_FLAGS_UNSUBMAP) && (mm != NULL)) {
-               /* might as well release this */
-               if (data->flags & PMEM_FLAGS_SUBMAP) {
-                       put_task_struct(data->task);
-                       data->task = NULL;
-                       /* lower the submap flag to show the mm is gone */
-                       data->flags &= ~(PMEM_FLAGS_SUBMAP);
-               }
-               pmem_unlock_data_and_mm(data, mm);
-               return -1;
-       }
-       *locked_mm = mm;
-       return ret;
-}
-
-int pmem_remap(struct pmem_region *region, struct file *file,
-                     unsigned operation)
-{
-       int ret;
-       struct pmem_region_node *region_node;
-       struct mm_struct *mm = NULL;
-       struct list_head *elt, *elt2;
-       int id = get_id(file);
-       struct pmem_data *data = (struct pmem_data *)file->private_data;
-
-       /* pmem region must be aligned on a page boundry */
-       if (unlikely(!PMEM_IS_PAGE_ALIGNED(region->offset) ||
-                !PMEM_IS_PAGE_ALIGNED(region->len))) {
-#if PMEM_DEBUG
-               printk("pmem: request for unaligned pmem suballocation "
-                      "%lx %lx\n", region->offset, region->len);
-#endif
-               return -EINVAL;
-       }
-
-       /* if userspace requests a region of len 0, there's nothing to do */
-       if (region->len == 0)
-               return 0;
-
-       /* lock the mm and data */
-       ret = pmem_lock_data_and_mm(file, data, &mm);
-       if (ret)
-               return 0;
-
-       /* only the owner of the master file can remap the client fds
-        * that back in it */
-       if (!is_master_owner(file)) {
-#if PMEM_DEBUG
-               printk("pmem: remap requested from non-master process\n");
-#endif
-               ret = -EINVAL;
-               goto err;
-       }
-
-       /* check that the requested range is within the src allocation */
-       if (unlikely((region->offset > pmem_len(id, data)) ||
-                    (region->len > pmem_len(id, data)) ||
-                    (region->offset + region->len > pmem_len(id, data)))) {
-#if PMEM_DEBUG
-               printk(KERN_INFO "pmem: suballoc doesn't fit in src_file!\n");
-#endif
-               ret = -EINVAL;
-               goto err;
-       }
-
-       if (operation == PMEM_MAP) {
-               region_node = kmalloc(sizeof(struct pmem_region_node),
-                             GFP_KERNEL);
-               if (!region_node) {
-                       ret = -ENOMEM;
-#if PMEM_DEBUG
-                       printk(KERN_INFO "No space to allocate metadata!");
-#endif
-                       goto err;
-               }
-               region_node->region = *region;
-               list_add(&region_node->list, &data->region_list);
-       } else if (operation == PMEM_UNMAP) {
-               int found = 0;
-               list_for_each_safe(elt, elt2, &data->region_list) {
-                       region_node = list_entry(elt, struct pmem_region_node,
-                                     list);
-                       if (region->len == 0 ||
-                           (region_node->region.offset == region->offset &&
-                           region_node->region.len == region->len)) {
-                               list_del(elt);
-                               kfree(region_node);
-                               found = 1;
-                       }
-               }
-               if (!found) {
-#if PMEM_DEBUG
-                       printk("pmem: Unmap region does not map any mapped "
-                               "region!");
-#endif
-                       ret = -EINVAL;
-                       goto err;
-               }
-       }
-
-       if (data->vma && PMEM_IS_SUBMAP(data)) {
-               if (operation == PMEM_MAP)
-                       ret = pmem_remap_pfn_range(id, data->vma, data,
-                                                  region->offset, region->len);
-               else if (operation == PMEM_UNMAP)
-                       ret = pmem_unmap_pfn_range(id, data->vma, data,
-                                                  region->offset, region->len);
-       }
-
-err:
-       pmem_unlock_data_and_mm(data, mm);
-       return ret;
-}
-
-static void pmem_revoke(struct file *file, struct pmem_data *data)
-{
-       struct pmem_region_node *region_node;
-       struct list_head *elt, *elt2;
-       struct mm_struct *mm = NULL;
-       int id = get_id(file);
-       int ret = 0;
-
-       data->master_file = NULL;
-       ret = pmem_lock_data_and_mm(file, data, &mm);
-       /* if lock_data_and_mm fails either the task that mapped the fd, or
-        * the vma that mapped it have already gone away, nothing more
-        * needs to be done */
-       if (ret)
-               return;
-       /* unmap everything */
-       /* delete the regions and region list nothing is mapped any more */
-       if (data->vma)
-               list_for_each_safe(elt, elt2, &data->region_list) {
-                       region_node = list_entry(elt, struct pmem_region_node,
-                                                list);
-                       pmem_unmap_pfn_range(id, data->vma, data,
-                                            region_node->region.offset,
-                                            region_node->region.len);
-                       list_del(elt);
-                       kfree(region_node);
-       }
-       /* delete the master file */
-       pmem_unlock_data_and_mm(data, mm);
-}
-
-static void pmem_get_size(struct pmem_region *region, struct file *file)
-{
-       struct pmem_data *data = (struct pmem_data *)file->private_data;
-       int id = get_id(file);
-
-       if (!has_allocation(file)) {
-               region->offset = 0;
-               region->len = 0;
-               return;
-       } else {
-               region->offset = pmem_start_addr(id, data);
-               region->len = pmem_len(id, data);
-       }
-       DLOG("offset %lx len %lx\n", region->offset, region->len);
-}
-
-
-static long pmem_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
-       struct pmem_data *data;
-       int id = get_id(file);
-
-       switch (cmd) {
-       case PMEM_GET_PHYS:
-               {
-                       struct pmem_region region;
-                       DLOG("get_phys\n");
-                       if (!has_allocation(file)) {
-                               region.offset = 0;
-                               region.len = 0;
-                       } else {
-                               data = (struct pmem_data *)file->private_data;
-                               region.offset = pmem_start_addr(id, data);
-                               region.len = pmem_len(id, data);
-                       }
-                       printk(KERN_INFO "pmem: request for physical address of pmem region "
-                                       "from process %d.\n", current->pid);
-                       if (copy_to_user((void __user *)arg, &region,
-                                               sizeof(struct pmem_region)))
-                               return -EFAULT;
-                       break;
-               }
-       case PMEM_MAP:
-               {
-                       struct pmem_region region;
-                       if (copy_from_user(&region, (void __user *)arg,
-                                               sizeof(struct pmem_region)))
-                               return -EFAULT;
-                       data = (struct pmem_data *)file->private_data;
-                       return pmem_remap(&region, file, PMEM_MAP);
-               }
-               break;
-       case PMEM_UNMAP:
-               {
-                       struct pmem_region region;
-                       if (copy_from_user(&region, (void __user *)arg,
-                                               sizeof(struct pmem_region)))
-                               return -EFAULT;
-                       data = (struct pmem_data *)file->private_data;
-                       return pmem_remap(&region, file, PMEM_UNMAP);
-                       break;
-               }
-       case PMEM_GET_SIZE:
-               {
-                       struct pmem_region region;
-                       DLOG("get_size\n");
-                       pmem_get_size(&region, file);
-                       if (copy_to_user((void __user *)arg, &region,
-                                               sizeof(struct pmem_region)))
-                               return -EFAULT;
-                       break;
-               }
-       case PMEM_GET_TOTAL_SIZE:
-               {
-                       struct pmem_region region;
-                       DLOG("get total size\n");
-                       region.offset = 0;
-                       get_id(file);
-                       region.len = pmem[id].size;
-                       if (copy_to_user((void __user *)arg, &region,
-                                               sizeof(struct pmem_region)))
-                               return -EFAULT;
-                       break;
-               }
-       case PMEM_ALLOCATE:
-               {
-                       if (has_allocation(file))
-                               return -EINVAL;
-                       data = (struct pmem_data *)file->private_data;
-                       data->index = pmem_allocate(id, arg);
-                       break;
-               }
-       case PMEM_CONNECT:
-               DLOG("connect\n");
-               return pmem_connect(arg, file);
-               break;
-       case PMEM_CACHE_FLUSH:
-               {
-                       struct pmem_region region;
-                       DLOG("flush\n");
-                       if (copy_from_user(&region, (void __user *)arg,
-                                          sizeof(struct pmem_region)))
-                               return -EFAULT;
-                       flush_pmem_file(file, region.offset, region.len);
-                       break;
-               }
-       default:
-               if (pmem[id].ioctl)
-                       return pmem[id].ioctl(file, cmd, arg);
-               return -EINVAL;
-       }
-       return 0;
-}
-
-#if PMEM_DEBUG
-static ssize_t debug_open(struct inode *inode, struct file *file)
-{
-       file->private_data = inode->i_private;
-       return 0;
-}
-
-static ssize_t debug_read(struct file *file, char __user *buf, size_t count,
-                         loff_t *ppos)
-{
-       struct list_head *elt, *elt2;
-       struct pmem_data *data;
-       struct pmem_region_node *region_node;
-       int id = (int)file->private_data;
-       const int debug_bufmax = 4096;
-       static char buffer[4096];
-       int n = 0;
-
-       DLOG("debug open\n");
-       n = scnprintf(buffer, debug_bufmax,
-                     "pid #: mapped regions (offset, len) (offset,len)...\n");
-
-       mutex_lock(&pmem[id].data_list_lock);
-       list_for_each(elt, &pmem[id].data_list) {
-               data = list_entry(elt, struct pmem_data, list);
-               down_read(&data->sem);
-               n += scnprintf(buffer + n, debug_bufmax - n, "pid %u:",
-                               data->pid);
-               list_for_each(elt2, &data->region_list) {
-                       region_node = list_entry(elt2, struct pmem_region_node,
-                                     list);
-                       n += scnprintf(buffer + n, debug_bufmax - n,
-                                       "(%lx,%lx) ",
-                                       region_node->region.offset,
-                                       region_node->region.len);
-               }
-               n += scnprintf(buffer + n, debug_bufmax - n, "\n");
-               up_read(&data->sem);
-       }
-       mutex_unlock(&pmem[id].data_list_lock);
-
-       n++;
-       buffer[n] = 0;
-       return simple_read_from_buffer(buf, count, ppos, buffer, n);
-}
-
-static struct file_operations debug_fops = {
-       .read = debug_read,
-       .open = debug_open,
-};
-#endif
-
-#if 0
-static struct miscdevice pmem_dev = {
-       .name = "pmem",
-       .fops = &pmem_fops,
-};
-#endif
-
-int pmem_setup(struct android_pmem_platform_data *pdata,
-              long (*ioctl)(struct file *, unsigned int, unsigned long),
-              int (*release)(struct inode *, struct file *))
-{
-       int err = 0;
-       int i, index = 0;
-       int id = id_count;
-       id_count++;
-
-       pmem[id].no_allocator = pdata->no_allocator;
-       pmem[id].cached = pdata->cached;
-       pmem[id].buffered = pdata->buffered;
-       pmem[id].base = pdata->start;
-       pmem[id].size = pdata->size;
-       pmem[id].ioctl = ioctl;
-       pmem[id].release = release;
-       init_rwsem(&pmem[id].bitmap_sem);
-       mutex_init(&pmem[id].data_list_lock);
-       INIT_LIST_HEAD(&pmem[id].data_list);
-       pmem[id].dev.name = pdata->name;
-       pmem[id].dev.minor = id;
-       pmem[id].dev.fops = &pmem_fops;
-       printk(KERN_INFO "%s: %d init\n", pdata->name, pdata->cached);
-
-       err = misc_register(&pmem[id].dev);
-       if (err) {
-               printk(KERN_ALERT "Unable to register pmem driver!\n");
-               goto err_cant_register_device;
-       }
-       pmem[id].num_entries = pmem[id].size / PMEM_MIN_ALLOC;
-
-       pmem[id].bitmap = kmalloc(pmem[id].num_entries *
-                                 sizeof(struct pmem_bits), GFP_KERNEL);
-       if (!pmem[id].bitmap)
-               goto err_no_mem_for_metadata;
-
-       memset(pmem[id].bitmap, 0, sizeof(struct pmem_bits) *
-                                         pmem[id].num_entries);
-
-       for (i = sizeof(pmem[id].num_entries) * 8 - 1; i >= 0; i--) {
-               if ((pmem[id].num_entries) &  1<<i) {
-                       PMEM_ORDER(id, index) = i;
-                       index = PMEM_NEXT_INDEX(id, index);
-               }
-       }
-
-       if (pmem[id].cached)
-               pmem[id].vbase = ioremap_cached(pmem[id].base,
-                                               pmem[id].size);
-#ifdef ioremap_ext_buffered
-       else if (pmem[id].buffered)
-               pmem[id].vbase = ioremap_ext_buffered(pmem[id].base,
-                                                     pmem[id].size);
-#endif
-       else
-               pmem[id].vbase = ioremap(pmem[id].base, pmem[id].size);
-
-       if (pmem[id].vbase == 0)
-               goto error_cant_remap;
-
-       pmem[id].garbage_pfn = page_to_pfn(alloc_page(GFP_KERNEL));
-       if (pmem[id].no_allocator)
-               pmem[id].allocated = 0;
-
-#if PMEM_DEBUG
-       debugfs_create_file(pdata->name, S_IFREG | S_IRUGO, NULL, (void *)id,
-                           &debug_fops);
-#endif
-       return 0;
-error_cant_remap:
-       kfree(pmem[id].bitmap);
-err_no_mem_for_metadata:
-       misc_deregister(&pmem[id].dev);
-err_cant_register_device:
-       return -1;
-}
-
-static int pmem_probe(struct platform_device *pdev)
-{
-       struct android_pmem_platform_data *pdata;
-
-       if (!pdev || !pdev->dev.platform_data) {
-               printk(KERN_ALERT "Unable to probe pmem!\n");
-               return -1;
-       }
-       pdata = pdev->dev.platform_data;
-       return pmem_setup(pdata, NULL, NULL);
-}
-
-
-static int pmem_remove(struct platform_device *pdev)
-{
-       int id = pdev->id;
-       __free_page(pfn_to_page(pmem[id].garbage_pfn));
-       misc_deregister(&pmem[id].dev);
-       return 0;
-}
-
-static struct platform_driver pmem_driver = {
-       .probe = pmem_probe,
-       .remove = pmem_remove,
-       .driver = { .name = "android_pmem" }
-};
-
-
-static int __init pmem_init(void)
-{
-       return platform_driver_register(&pmem_driver);
-}
-
-static void __exit pmem_exit(void)
-{
-       platform_driver_unregister(&pmem_driver);
-}
-
-module_init(pmem_init);
-module_exit(pmem_exit);
-