mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 02:23:16 +00:00
1ebe2e5f9d
All modern drivers can support extra partitions using the extended dev_t. In fact except for the ioctl method drivers never even see partitions in normal operation. So remove the GENHD_FL_EXT_DEVT and allow extra partitions for all block devices that do support partitions, and require those that do not support partitions to explicit disallow them using GENHD_FL_NO_PART. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20211122130625.1136848-12-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
416 lines
9.2 KiB
C
416 lines
9.2 KiB
C
/*
|
|
** 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/blk-mq.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/pgtable.h>
|
|
|
|
#include <asm/setup.h>
|
|
#include <asm/amigahw.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[Z2MINOR_COUNT];
|
|
|
|
static blk_status_t z2_queue_rq(struct blk_mq_hw_ctx *hctx,
|
|
const struct blk_mq_queue_data *bd)
|
|
{
|
|
struct request *req = bd->rq;
|
|
unsigned long start = blk_rq_pos(req) << 9;
|
|
unsigned long len = blk_rq_cur_bytes(req);
|
|
|
|
blk_mq_start_request(req);
|
|
|
|
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));
|
|
return BLK_STS_IOERR;
|
|
}
|
|
|
|
spin_lock_irq(&z2ram_lock);
|
|
|
|
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;
|
|
}
|
|
|
|
spin_unlock_irq(&z2ram_lock);
|
|
blk_mq_end_request(req, BLK_STS_OK);
|
|
return BLK_STS_OK;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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_wt(paddr, size);
|
|
|
|
#else
|
|
vaddr =
|
|
(unsigned long)z_remap_nocache_nonser(paddr, size);
|
|
#endif
|
|
z2ram_map =
|
|
kmalloc_array(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)
|
|
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)
|
|
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[device], z2ram_size >> 9);
|
|
}
|
|
|
|
mutex_unlock(&z2ram_mutex);
|
|
return 0;
|
|
|
|
err_out_kfree:
|
|
kfree(z2ram_map);
|
|
err_out:
|
|
mutex_unlock(&z2ram_mutex);
|
|
return rc;
|
|
}
|
|
|
|
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
|
|
*/
|
|
}
|
|
|
|
static const struct block_device_operations z2_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = z2_open,
|
|
.release = z2_release,
|
|
};
|
|
|
|
static struct blk_mq_tag_set tag_set;
|
|
|
|
static const struct blk_mq_ops z2_mq_ops = {
|
|
.queue_rq = z2_queue_rq,
|
|
};
|
|
|
|
static int z2ram_register_disk(int minor)
|
|
{
|
|
struct gendisk *disk;
|
|
int err;
|
|
|
|
disk = blk_mq_alloc_disk(&tag_set, NULL);
|
|
if (IS_ERR(disk))
|
|
return PTR_ERR(disk);
|
|
|
|
disk->major = Z2RAM_MAJOR;
|
|
disk->first_minor = minor;
|
|
disk->minors = 1;
|
|
disk->flags |= GENHD_FL_NO_PART;
|
|
disk->fops = &z2_fops;
|
|
if (minor)
|
|
sprintf(disk->disk_name, "z2ram%d", minor);
|
|
else
|
|
sprintf(disk->disk_name, "z2ram");
|
|
|
|
z2ram_gendisk[minor] = disk;
|
|
err = add_disk(disk);
|
|
if (err)
|
|
blk_cleanup_disk(disk);
|
|
return err;
|
|
}
|
|
|
|
static int __init z2_init(void)
|
|
{
|
|
int ret, i;
|
|
|
|
if (!MACH_IS_AMIGA)
|
|
return -ENODEV;
|
|
|
|
if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
|
|
return -EBUSY;
|
|
|
|
tag_set.ops = &z2_mq_ops;
|
|
tag_set.nr_hw_queues = 1;
|
|
tag_set.nr_maps = 1;
|
|
tag_set.queue_depth = 16;
|
|
tag_set.numa_node = NUMA_NO_NODE;
|
|
tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
|
|
ret = blk_mq_alloc_tag_set(&tag_set);
|
|
if (ret)
|
|
goto out_unregister_blkdev;
|
|
|
|
for (i = 0; i < Z2MINOR_COUNT; i++) {
|
|
ret = z2ram_register_disk(i);
|
|
if (ret && i == 0)
|
|
goto out_free_tagset;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_free_tagset:
|
|
blk_mq_free_tag_set(&tag_set);
|
|
out_unregister_blkdev:
|
|
unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit z2_exit(void)
|
|
{
|
|
int i, j;
|
|
|
|
unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
|
|
|
|
for (i = 0; i < Z2MINOR_COUNT; i++) {
|
|
del_gendisk(z2ram_gendisk[i]);
|
|
blk_cleanup_queue(z2ram_gendisk[i]->queue);
|
|
put_disk(z2ram_gendisk[i]);
|
|
}
|
|
blk_mq_free_tag_set(&tag_set);
|
|
|
|
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;
|
|
}
|
|
|
|
module_init(z2_init);
|
|
module_exit(z2_exit);
|
|
MODULE_LICENSE("GPL");
|