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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <linux/ata.h>#include <linux/blk-mq.h>#include <linux/slab.h>#include <linux/module.h>
#include <asm/lv1call.h>#include <asm/ps3stor.h>#include <asm/firmware.h>
#define DEVICE_NAME "ps3disk"
#define BOUNCE_SIZE (64*1024)
#define PS3DISK_MAX_DISKS 16#define PS3DISK_MINORS 16
#define PS3DISK_NAME "ps3d%c"
struct ps3disk_private { spinlock_t lock; /* Request queue spinlock */ struct blk_mq_tag_set tag_set; struct gendisk *gendisk; unsigned int blocking_factor; struct request *req; u64 raw_capacity; unsigned char model[ATA_ID_PROD_LEN+1];};
#define LV1_STORAGE_SEND_ATA_COMMAND (2)#define LV1_STORAGE_ATA_HDDOUT (0x23)
struct lv1_ata_cmnd_block { u16 features; u16 sector_count; u16 LBA_low; u16 LBA_mid; u16 LBA_high; u8 device; u8 command; u32 is_ext; u32 proto; u32 in_out; u32 size; u64 buffer; u32 arglen;};
enum lv1_ata_proto { NON_DATA_PROTO = 0, PIO_DATA_IN_PROTO = 1, PIO_DATA_OUT_PROTO = 2, DMA_PROTO = 3};
enum lv1_ata_in_out { DIR_WRITE = 0, /* memory -> device */ DIR_READ = 1 /* device -> memory */};
static int ps3disk_major;
static const struct block_device_operations ps3disk_fops = { .owner = THIS_MODULE,};
static void ps3disk_scatter_gather(struct ps3_storage_device *dev, struct request *req, int gather){ unsigned int offset = 0; struct req_iterator iter; struct bio_vec bvec;
rq_for_each_segment(bvec, req, iter) { dev_dbg(&dev->sbd.core, "%s:%u: %u sectors from %llu\n", __func__, __LINE__, bio_sectors(iter.bio), iter.bio->bi_iter.bi_sector); if (gather) memcpy_from_bvec(dev->bounce_buf + offset, &bvec); else memcpy_to_bvec(&bvec, dev->bounce_buf + offset); offset += bvec.bv_len; }}
static blk_status_t ps3disk_submit_request_sg(struct ps3_storage_device *dev, struct request *req){ struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); int write = rq_data_dir(req), res; const char *op = write ? "write" : "read"; u64 start_sector, sectors; unsigned int region_id = dev->regions[dev->region_idx].id;
#ifdef DEBUG unsigned int n = 0; struct bio_vec bv; struct req_iterator iter;
rq_for_each_segment(bv, req, iter) n++; dev_dbg(&dev->sbd.core, "%s:%u: %s req has %u bvecs for %u sectors\n", __func__, __LINE__, op, n, blk_rq_sectors(req));#endif
start_sector = blk_rq_pos(req) * priv->blocking_factor; sectors = blk_rq_sectors(req) * priv->blocking_factor; dev_dbg(&dev->sbd.core, "%s:%u: %s %llu sectors starting at %llu\n", __func__, __LINE__, op, sectors, start_sector);
if (write) { ps3disk_scatter_gather(dev, req, 1);
res = lv1_storage_write(dev->sbd.dev_id, region_id, start_sector, sectors, 0, dev->bounce_lpar, &dev->tag); } else { res = lv1_storage_read(dev->sbd.dev_id, region_id, start_sector, sectors, 0, dev->bounce_lpar, &dev->tag); } if (res) { dev_err(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__, __LINE__, op, res); return BLK_STS_IOERR; }
priv->req = req; return BLK_STS_OK;}
static blk_status_t ps3disk_submit_flush_request(struct ps3_storage_device *dev, struct request *req){ struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); u64 res;
dev_dbg(&dev->sbd.core, "%s:%u: flush request\n", __func__, __LINE__);
res = lv1_storage_send_device_command(dev->sbd.dev_id, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0, &dev->tag); if (res) { dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n", __func__, __LINE__, res); return BLK_STS_IOERR; }
priv->req = req; return BLK_STS_OK;}
static blk_status_t ps3disk_do_request(struct ps3_storage_device *dev, struct request *req){ dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
switch (req_op(req)) { case REQ_OP_FLUSH: return ps3disk_submit_flush_request(dev, req); case REQ_OP_READ: case REQ_OP_WRITE: return ps3disk_submit_request_sg(dev, req); default: blk_dump_rq_flags(req, DEVICE_NAME " bad request"); return BLK_STS_IOERR; }}
static blk_status_t ps3disk_queue_rq(struct blk_mq_hw_ctx *hctx, const struct blk_mq_queue_data *bd){ struct request_queue *q = hctx->queue; struct ps3_storage_device *dev = q->queuedata; struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); blk_status_t ret;
blk_mq_start_request(bd->rq);
spin_lock_irq(&priv->lock); ret = ps3disk_do_request(dev, bd->rq); spin_unlock_irq(&priv->lock);
return ret;}
static irqreturn_t ps3disk_interrupt(int irq, void *data){ struct ps3_storage_device *dev = data; struct ps3disk_private *priv; struct request *req; int res, read; blk_status_t error; u64 tag, status; const char *op;
res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
if (tag != dev->tag) dev_err(&dev->sbd.core, "%s:%u: tag mismatch, got %llx, expected %llx\n", __func__, __LINE__, tag, dev->tag);
if (res) { dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n", __func__, __LINE__, res, status); return IRQ_HANDLED; }
priv = ps3_system_bus_get_drvdata(&dev->sbd); req = priv->req; if (!req) { dev_dbg(&dev->sbd.core, "%s:%u non-block layer request completed\n", __func__, __LINE__); dev->lv1_status = status; complete(&dev->done); return IRQ_HANDLED; }
if (req_op(req) == REQ_OP_FLUSH) { read = 0; op = "flush"; } else { read = !rq_data_dir(req); op = read ? "read" : "write"; } if (status) { dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__, __LINE__, op, status); error = BLK_STS_IOERR; } else { dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__, __LINE__, op); error = 0; if (read) ps3disk_scatter_gather(dev, req, 0); }
spin_lock(&priv->lock); priv->req = NULL; blk_mq_end_request(req, error); spin_unlock(&priv->lock);
blk_mq_run_hw_queues(priv->gendisk->queue, true); return IRQ_HANDLED;}
static int ps3disk_sync_cache(struct ps3_storage_device *dev){ u64 res;
dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);
res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0); if (res) { dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n", __func__, __LINE__, res); return -EIO; } return 0;}
/* ATA helpers copied from drivers/ata/libata-core.c */
static void swap_buf_le16(u16 *buf, unsigned int buf_words){#ifdef __BIG_ENDIAN unsigned int i;
for (i = 0; i < buf_words; i++) buf[i] = le16_to_cpu(buf[i]);#endif /* __BIG_ENDIAN */}
static u64 ata_id_n_sectors(const u16 *id){ if (ata_id_has_lba(id)) { if (ata_id_has_lba48(id)) return ata_id_u64(id, 100); else return ata_id_u32(id, 60); } else { if (ata_id_current_chs_valid(id)) return ata_id_u32(id, 57); else return id[1] * id[3] * id[6]; }}
static void ata_id_string(const u16 *id, unsigned char *s, unsigned int ofs, unsigned int len){ unsigned int c;
while (len > 0) { c = id[ofs] >> 8; *s = c; s++;
c = id[ofs] & 0xff; *s = c; s++;
ofs++; len -= 2; }}
static void ata_id_c_string(const u16 *id, unsigned char *s, unsigned int ofs, unsigned int len){ unsigned char *p;
WARN_ON(!(len & 1));
ata_id_string(id, s, ofs, len - 1);
p = s + strnlen(s, len - 1); while (p > s && p[-1] == ' ') p--; *p = '\0';}
static int ps3disk_identify(struct ps3_storage_device *dev){ struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); struct lv1_ata_cmnd_block ata_cmnd; u16 *id = dev->bounce_buf; u64 res;
dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);
memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block)); ata_cmnd.command = ATA_CMD_ID_ATA; ata_cmnd.sector_count = 1; ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2; ata_cmnd.buffer = dev->bounce_lpar; ata_cmnd.proto = PIO_DATA_IN_PROTO; ata_cmnd.in_out = DIR_READ;
res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND, ps3_mm_phys_to_lpar(__pa(&ata_cmnd)), sizeof(ata_cmnd), ata_cmnd.buffer, ata_cmnd.arglen); if (res) { dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%llx\n", __func__, __LINE__, res); return -EIO; }
swap_buf_le16(id, ATA_ID_WORDS);
/* All we're interested in are raw capacity and model name */ priv->raw_capacity = ata_id_n_sectors(id); ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model)); return 0;}
static unsigned long ps3disk_mask;
static DEFINE_MUTEX(ps3disk_mask_mutex);
static const struct blk_mq_ops ps3disk_mq_ops = { .queue_rq = ps3disk_queue_rq,};
static int ps3disk_probe(struct ps3_system_bus_device *_dev){ struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core); struct ps3disk_private *priv; int error; unsigned int devidx; struct queue_limits lim = { .logical_block_size = dev->blk_size, .max_hw_sectors = BOUNCE_SIZE >> 9, .max_segments = -1, .max_segment_size = BOUNCE_SIZE, .dma_alignment = dev->blk_size - 1, .features = BLK_FEAT_WRITE_CACHE | BLK_FEAT_ROTATIONAL, }; struct gendisk *gendisk;
if (dev->blk_size < 512) { dev_err(&dev->sbd.core, "%s:%u: cannot handle block size %llu\n", __func__, __LINE__, dev->blk_size); return -EINVAL; }
BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG); mutex_lock(&ps3disk_mask_mutex); devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS); if (devidx >= PS3DISK_MAX_DISKS) { dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__, __LINE__); mutex_unlock(&ps3disk_mask_mutex); return -ENOSPC; } __set_bit(devidx, &ps3disk_mask); mutex_unlock(&ps3disk_mask_mutex);
priv = kzalloc_obj(*priv); if (!priv) { error = -ENOMEM; goto fail; }
ps3_system_bus_set_drvdata(_dev, priv); spin_lock_init(&priv->lock);
dev->bounce_size = BOUNCE_SIZE; dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA); if (!dev->bounce_buf) { error = -ENOMEM; goto fail_free_priv; }
error = ps3stor_setup(dev, ps3disk_interrupt); if (error) goto fail_free_bounce;
ps3disk_identify(dev);
error = blk_mq_alloc_sq_tag_set(&priv->tag_set, &ps3disk_mq_ops, 1, 0); if (error) goto fail_teardown;
gendisk = blk_mq_alloc_disk(&priv->tag_set, &lim, dev); if (IS_ERR(gendisk)) { dev_err(&dev->sbd.core, "%s:%u: blk_mq_alloc_disk failed\n", __func__, __LINE__); error = PTR_ERR(gendisk); goto fail_free_tag_set; }
priv->gendisk = gendisk; gendisk->major = ps3disk_major; gendisk->first_minor = devidx * PS3DISK_MINORS; gendisk->minors = PS3DISK_MINORS; gendisk->fops = &ps3disk_fops; gendisk->private_data = dev; snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME, devidx+'a'); priv->blocking_factor = dev->blk_size >> 9; set_capacity(gendisk, dev->regions[dev->region_idx].size*priv->blocking_factor);
dev_info(&dev->sbd.core, "%s is a %s (%llu MiB total, %llu MiB for OtherOS)\n", gendisk->disk_name, priv->model, priv->raw_capacity >> 11, get_capacity(gendisk) >> 11);
error = device_add_disk(&dev->sbd.core, gendisk, NULL); if (error) goto fail_cleanup_disk;
return 0;fail_cleanup_disk: put_disk(gendisk);fail_free_tag_set: blk_mq_free_tag_set(&priv->tag_set);fail_teardown: ps3stor_teardown(dev);fail_free_bounce: kfree(dev->bounce_buf);fail_free_priv: kfree(priv); ps3_system_bus_set_drvdata(_dev, NULL);fail: mutex_lock(&ps3disk_mask_mutex); __clear_bit(devidx, &ps3disk_mask); mutex_unlock(&ps3disk_mask_mutex); return error;}
static void ps3disk_remove(struct ps3_system_bus_device *_dev){ struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core); struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
mutex_lock(&ps3disk_mask_mutex); __clear_bit(MINOR(disk_devt(priv->gendisk)) / PS3DISK_MINORS, &ps3disk_mask); mutex_unlock(&ps3disk_mask_mutex); del_gendisk(priv->gendisk); put_disk(priv->gendisk); blk_mq_free_tag_set(&priv->tag_set); dev_notice(&dev->sbd.core, "Synchronizing disk cache\n"); ps3disk_sync_cache(dev); ps3stor_teardown(dev); kfree(dev->bounce_buf); kfree(priv); ps3_system_bus_set_drvdata(_dev, NULL);}
static struct ps3_system_bus_driver ps3disk = { .match_id = PS3_MATCH_ID_STOR_DISK, .core.name = DEVICE_NAME, .core.owner = THIS_MODULE, .probe = ps3disk_probe, .remove = ps3disk_remove, .shutdown = ps3disk_remove,};
static int __init ps3disk_init(void){ int error;
if (!firmware_has_feature(FW_FEATURE_PS3_LV1)) return -ENODEV;
error = register_blkdev(0, DEVICE_NAME); if (error <= 0) { printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__, __LINE__, error); return error; } ps3disk_major = error;
pr_info("%s:%u: registered block device major %d\n", __func__, __LINE__, ps3disk_major);
error = ps3_system_bus_driver_register(&ps3disk); if (error) unregister_blkdev(ps3disk_major, DEVICE_NAME);
return error;}
static void __exit ps3disk_exit(void){ ps3_system_bus_driver_unregister(&ps3disk); unregister_blkdev(ps3disk_major, DEVICE_NAME);}
module_init(ps3disk_init);module_exit(ps3disk_exit);
MODULE_LICENSE("GPL");MODULE_DESCRIPTION("PS3 Disk Storage Driver");MODULE_AUTHOR("Sony Corporation");MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK);