Messages in this thread | | | Date | Fri, 27 Jan 2012 09:53:38 -0800 | Subject | Re: [PATCH] Staging: android: Remove pmem driver | From | Dima Zavin <> |
| |
Acked-by: Dima Zavin <dima@android.com>
On Thu, Jan 26, 2012 at 12:01 PM, Shuah Khan <shuahkhan@gmail.com> wrote: > 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> > > --- > drivers/staging/android/Kconfig | 4 - > drivers/staging/android/Makefile | 1 - > drivers/staging/android/android_pmem.h | 93 --- > drivers/staging/android/pmem.c | 1345 > -------------------------------- > 4 files changed, 0 insertions(+), 1443 deletions(-) > delete mode 100644 drivers/staging/android/android_pmem.h > delete mode 100644 drivers/staging/android/pmem.c > > diff --git a/drivers/staging/android/Kconfig > b/drivers/staging/android/Kconfig > index becf711..94cb2ac 100644 > --- a/drivers/staging/android/Kconfig > +++ b/drivers/staging/android/Kconfig > @@ -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 > diff --git a/drivers/staging/android/Makefile > b/drivers/staging/android/Makefile > index eaed1ff..5fcc24f 100644 > --- a/drivers/staging/android/Makefile > +++ b/drivers/staging/android/Makefile > @@ -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 > index f633621..0000000 > --- a/drivers/staging/android/android_pmem.h > +++ /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 > index 7d97032..0000000 > --- a/drivers/staging/android/pmem.c > +++ /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(®ion_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, ®ion, > - sizeof(struct pmem_region))) > - return -EFAULT; > - break; > - } > - case PMEM_MAP: > - { > - struct pmem_region region; > - if (copy_from_user(®ion, (void __user *)arg, > - sizeof(struct pmem_region))) > - return -EFAULT; > - data = (struct pmem_data *)file->private_data; > - return pmem_remap(®ion, file, PMEM_MAP); > - } > - break; > - case PMEM_UNMAP: > - { > - struct pmem_region region; > - if (copy_from_user(®ion, (void __user *)arg, > - sizeof(struct pmem_region))) > - return -EFAULT; > - data = (struct pmem_data *)file->private_data; > - return pmem_remap(®ion, file, PMEM_UNMAP); > - break; > - } > - case PMEM_GET_SIZE: > - { > - struct pmem_region region; > - DLOG("get_size\n"); > - pmem_get_size(®ion, file); > - if (copy_to_user((void __user *)arg, ®ion, > - 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, ®ion, > - 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(®ion, (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); > - > -- > 1.7.0.4 > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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