cregit-Linux how code gets into the kernel

Release 4.10 drivers/block/z2ram.c

Directory: drivers/block
/*
** z2ram - Amiga pseudo-driver to access 16bit-RAM in ZorroII space
**         as a block device, to be used as a RAM disk or swap space
** 
** Copyright (C) 1994 by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
**
** ++Geert: support for zorro_unused_z2ram, better range checking
** ++roman: translate accesses via an array
** ++Milan: support for ChipRAM usage
** ++yambo: converted to 2.0 kernel
** ++yambo: modularized and support added for 3 minor devices including:
**          MAJOR  MINOR  DESCRIPTION
**          -----  -----  ----------------------------------------------
**          37     0       Use Zorro II and Chip ram
**          37     1       Use only Zorro II ram
**          37     2       Use only Chip ram
**          37     4-7     Use memory list entry 1-4 (first is 0)
** ++jskov: support for 1-4th memory list entry.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation.  This software is provided "as is" without express or
** implied warranty.
*/


#define DEVICE_NAME "Z2RAM"

#include <linux/major.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/bitops.h>
#include <linux/mutex.h>
#include <linux/slab.h>

#include <asm/setup.h>
#include <asm/amigahw.h>
#include <asm/pgtable.h>

#include <linux/zorro.h>



#define Z2MINOR_COMBINED      (0)

#define Z2MINOR_Z2ONLY        (1)

#define Z2MINOR_CHIPONLY      (2)

#define Z2MINOR_MEMLIST1      (4)

#define Z2MINOR_MEMLIST2      (5)

#define Z2MINOR_MEMLIST3      (6)

#define Z2MINOR_MEMLIST4      (7)

#define Z2MINOR_COUNT         (8) 
/* Move this down when adding a new minor */


#define Z2RAM_CHUNK1024       ( Z2RAM_CHUNKSIZE >> 10 )

static DEFINE_MUTEX(z2ram_mutex);

static u_long *z2ram_map    = NULL;

static u_long z2ram_size    = 0;

static int z2_count         = 0;

static int chip_count       = 0;

static int list_count       = 0;

static int current_device   = -1;

static DEFINE_SPINLOCK(z2ram_lock);


static struct gendisk *z2ram_gendisk;


static void do_z2_request(struct request_queue *q) { struct request *req; req = blk_fetch_request(q); while (req) { unsigned long start = blk_rq_pos(req) << 9; unsigned long len = blk_rq_cur_bytes(req); int err = 0; if (start + len > z2ram_size) { pr_err(DEVICE_NAME ": bad access: block=%llu, " "count=%u\n", (unsigned long long)blk_rq_pos(req), blk_rq_cur_sectors(req)); err = -EIO; goto done; } while (len) { unsigned long addr = start & Z2RAM_CHUNKMASK; unsigned long size = Z2RAM_CHUNKSIZE - addr; void *buffer = bio_data(req->bio); if (len < size) size = len; addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ]; if (rq_data_dir(req) == READ) memcpy(buffer, (char *)addr, size); else memcpy((char *)addr, buffer, size); start += size; len -= size; } done: if (!__blk_end_request_cur(req, err)) req = blk_fetch_request(q); } }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git10550.24%213.33%
tejun heotejun heo3717.70%533.33%
al viroal viro2612.44%213.33%
geert uytterhoevengeert uytterhoeven188.61%16.67%
jens axboejens axboe178.13%320.00%
roman zippelroman zippel31.44%16.67%
alan coxalan cox31.44%16.67%
Total209100.00%15100.00%


static void get_z2ram( void ) { int i; for ( i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++ ) { if ( test_bit( i, zorro_unused_z2ram ) ) { z2_count++; z2ram_map[z2ram_size++] = (unsigned long)ZTWO_VADDR(Z2RAM_START) + (i << Z2RAM_CHUNKSHIFT); clear_bit( i, zorro_unused_z2ram ); } } return; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git6794.37%150.00%
geert uytterhoevengeert uytterhoeven45.63%150.00%
Total71100.00%2100.00%


static void get_chipram( void ) { while ( amiga_chip_avail() > ( Z2RAM_CHUNKSIZE * 4 ) ) { chip_count++; z2ram_map[ z2ram_size ] = (u_long)amiga_chip_alloc( Z2RAM_CHUNKSIZE, "z2ram" ); if ( z2ram_map[ z2ram_size ] == 0 ) { break; } z2ram_size++; } return; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git55100.00%2100.00%
Total55100.00%2100.00%


static int z2_open(struct block_device *bdev, fmode_t mode) { int device; int max_z2_map = ( Z2RAM_SIZE / Z2RAM_CHUNKSIZE ) * sizeof( z2ram_map[0] ); int max_chip_map = ( amiga_chip_size / Z2RAM_CHUNKSIZE ) * sizeof( z2ram_map[0] ); int rc = -ENOMEM; device = MINOR(bdev->bd_dev); mutex_lock(&z2ram_mutex); if ( current_device != -1 && current_device != device ) { rc = -EBUSY; goto err_out; } if ( current_device == -1 ) { z2_count = 0; chip_count = 0; list_count = 0; z2ram_size = 0; /* Use a specific list entry. */ if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) { int index = device - Z2MINOR_MEMLIST1 + 1; unsigned long size, paddr, vaddr; if (index >= m68k_realnum_memory) { printk( KERN_ERR DEVICE_NAME ": no such entry in z2ram_map\n" ); goto err_out; } paddr = m68k_memory[index].addr; size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1); #ifdef __powerpc__ /* FIXME: ioremap doesn't build correct memory tables. */ { vfree(vmalloc (size)); } vaddr = (unsigned long) __ioremap (paddr, size, _PAGE_WRITETHRU); #else vaddr = (unsigned long)z_remap_nocache_nonser(paddr, size); #endif z2ram_map = kmalloc((size/Z2RAM_CHUNKSIZE)*sizeof(z2ram_map[0]), GFP_KERNEL); if ( z2ram_map == NULL ) { printk( KERN_ERR DEVICE_NAME ": cannot get mem for z2ram_map\n" ); goto err_out; } while (size) { z2ram_map[ z2ram_size++ ] = vaddr; size -= Z2RAM_CHUNKSIZE; vaddr += Z2RAM_CHUNKSIZE; list_count++; } if ( z2ram_size != 0 ) printk( KERN_INFO DEVICE_NAME ": using %iK List Entry %d Memory\n", list_count * Z2RAM_CHUNK1024, index ); } else switch ( device ) { case Z2MINOR_COMBINED: z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL ); if ( z2ram_map == NULL ) { printk( KERN_ERR DEVICE_NAME ": cannot get mem for z2ram_map\n" ); goto err_out; } get_z2ram(); get_chipram(); if ( z2ram_size != 0 ) printk( KERN_INFO DEVICE_NAME ": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n", z2_count * Z2RAM_CHUNK1024, chip_count * Z2RAM_CHUNK1024, ( z2_count + chip_count ) * Z2RAM_CHUNK1024 ); break; case Z2MINOR_Z2ONLY: z2ram_map = kmalloc( max_z2_map, GFP_KERNEL ); if ( z2ram_map == NULL ) { printk( KERN_ERR DEVICE_NAME ": cannot get mem for z2ram_map\n" ); goto err_out; } get_z2ram(); if ( z2ram_size != 0 ) printk( KERN_INFO DEVICE_NAME ": using %iK of Zorro II RAM\n", z2_count * Z2RAM_CHUNK1024 ); break; case Z2MINOR_CHIPONLY: z2ram_map = kmalloc( max_chip_map, GFP_KERNEL ); if ( z2ram_map == NULL ) { printk( KERN_ERR DEVICE_NAME ": cannot get mem for z2ram_map\n" ); goto err_out; } get_chipram(); if ( z2ram_size != 0 ) printk( KERN_INFO DEVICE_NAME ": using %iK Chip RAM\n", chip_count * Z2RAM_CHUNK1024 ); break; default: rc = -ENODEV; goto err_out; break; } if ( z2ram_size == 0 ) { printk( KERN_NOTICE DEVICE_NAME ": no unused ZII/Chip RAM found\n" ); goto err_out_kfree; } current_device = device; z2ram_size <<= Z2RAM_CHUNKSHIFT; set_capacity(z2ram_gendisk, z2ram_size >> 9); } mutex_unlock(&z2ram_mutex); return 0; err_out_kfree: kfree(z2ram_map); err_out: mutex_unlock(&z2ram_mutex); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git49190.42%440.00%
geert uytterhoevengeert uytterhoeven213.87%110.00%
arnd bergmannarnd bergmann183.31%220.00%
al viroal viro122.21%220.00%
roman zippelroman zippel10.18%110.00%
Total543100.00%10100.00%


static void z2_release(struct gendisk *disk, fmode_t mode) { mutex_lock(&z2ram_mutex); if ( current_device == -1 ) { mutex_unlock(&z2ram_mutex); return; } mutex_unlock(&z2ram_mutex); /* * FIXME: unmap memory */ }

Contributors

PersonTokensPropCommitsCommitProp
arnd bergmannarnd bergmann2046.51%228.57%
geert uytterhoevengeert uytterhoeven1534.88%114.29%
al viroal viro613.95%228.57%
pre-gitpre-git24.65%228.57%
Total43100.00%7100.00%

static const struct block_device_operations z2_fops = { .owner = THIS_MODULE, .open = z2_open, .release = z2_release, };
static struct kobject *z2_find(dev_t dev, int *part, void *data) { *part = 0; return get_disk(z2ram_gendisk); }

Contributors

PersonTokensPropCommitsCommitProp
geert uytterhoevengeert uytterhoeven2996.67%150.00%
al viroal viro13.33%150.00%
Total30100.00%2100.00%

static struct request_queue *z2_queue;
static int __init z2_init(void) { int ret; if (!MACH_IS_AMIGA) return -ENODEV; ret = -EBUSY; if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME)) goto err; ret = -ENOMEM; z2ram_gendisk = alloc_disk(1); if (!z2ram_gendisk) goto out_disk; z2_queue = blk_init_queue(do_z2_request, &z2ram_lock); if (!z2_queue) goto out_queue; z2ram_gendisk->major = Z2RAM_MAJOR; z2ram_gendisk->first_minor = 0; z2ram_gendisk->fops = &z2_fops; sprintf(z2ram_gendisk->disk_name, "z2ram"); z2ram_gendisk->queue = z2_queue; add_disk(z2ram_gendisk); blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE, z2_find, NULL, NULL); return 0; out_queue: put_disk(z2ram_gendisk); out_disk: unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); err: return ret; }

Contributors

PersonTokensPropCommitsCommitProp
geert uytterhoevengeert uytterhoeven9660.38%220.00%
jens axboejens axboe5333.33%110.00%
al viroal viro53.14%440.00%
christoph hellwigchristoph hellwig31.89%110.00%
pre-gitpre-git21.26%220.00%
Total159100.00%10100.00%


static void __exit z2_exit(void) { int i, j; blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT); unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); del_gendisk(z2ram_gendisk); put_disk(z2ram_gendisk); blk_cleanup_queue(z2_queue); if ( current_device != -1 ) { i = 0; for ( j = 0 ; j < z2_count; j++ ) { set_bit( i++, zorro_unused_z2ram ); } for ( j = 0 ; j < chip_count; j++ ) { if ( z2ram_map[ i ] ) { amiga_chip_free( (void *) z2ram_map[ i++ ] ); } } if ( z2ram_map != NULL ) { kfree( z2ram_map ); } } return; }

Contributors

PersonTokensPropCommitsCommitProp
geert uytterhoevengeert uytterhoeven12290.37%114.29%
pre-gitpre-git53.70%114.29%
al viroal viro42.96%228.57%
christoph hellwigchristoph hellwig21.48%114.29%
akinobu mitaakinobu mita10.74%114.29%
zhao leizhao lei10.74%114.29%
Total135100.00%7100.00%

module_init(z2_init); module_exit(z2_exit); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git82758.12%817.78%
geert uytterhoevengeert uytterhoeven33423.47%511.11%
al viroal viro815.69%1124.44%
jens axboejens axboe714.99%48.89%
arnd bergmannarnd bergmann473.30%24.44%
tejun heotejun heo402.81%613.33%
christoph hellwigchristoph hellwig50.35%12.22%
roman zippelroman zippel40.28%12.22%
thomas gleixnerthomas gleixner40.28%12.22%
alan coxalan cox30.21%12.22%
adrian bunkadrian bunk20.14%12.22%
linus torvaldslinus torvalds20.14%12.22%
zhao leizhao lei10.07%12.22%
akinobu mitaakinobu mita10.07%12.22%
alexey dobriyanalexey dobriyan10.07%12.22%
Total1423100.00%45100.00%
Directory: drivers/block
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