cregit-Linux how code gets into the kernel

Release 4.7 drivers/block/ps3disk.c

Directory: drivers/block
/*
 * PS3 Disk Storage Driver
 *
 * Copyright (C) 2007 Sony Computer Entertainment Inc.
 * Copyright 2007 Sony Corp.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published
 * by the Free Software Foundation; version 2 of the License.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/ata.h>
#include <linux/blkdev.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 request_queue *queue;
	
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; unsigned int i = 0; size_t size; void *buf; rq_for_each_segment(bvec, req, iter) { unsigned long flags; dev_dbg(&dev->sbd.core, "%s:%u: bio %u: %u sectors from %lu\n", __func__, __LINE__, i, bio_sectors(iter.bio), iter.bio->bi_iter.bi_sector); size = bvec.bv_len; buf = bvec_kmap_irq(&bvec, &flags); if (gather) memcpy(dev->bounce_buf+offset, buf, size); else memcpy(buf, dev->bounce_buf+offset, size); offset += size; flush_kernel_dcache_page(bvec.bv_page); bvec_kunmap_irq(buf, &flags); i++; } }

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geert uytterhoevengeert uytterhoeven13180.37%116.67%
neil brownneil brown2515.34%116.67%
kent overstreetkent overstreet63.68%350.00%
dan carpenterdan carpenter10.61%116.67%
Total163100.00%6100.00%


static int 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); __blk_end_request_all(req, -EIO); return 0; } priv->req = req; return 1; }

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geert uytterhoevengeert uytterhoeven26290.66%222.22%
tejun heotejun heo134.50%444.44%
neil brownneil brown103.46%111.11%
roel kluinroel kluin31.04%111.11%
stephen rothwellstephen rothwell10.35%111.11%
Total289100.00%9100.00%


static int 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); __blk_end_request_all(req, -EIO); return 0; } priv->req = req; return 1; }

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geert uytterhoevengeert uytterhoeven11194.07%233.33%
tejun heotejun heo32.54%233.33%
roel kluinroel kluin32.54%116.67%
stephen rothwellstephen rothwell10.85%116.67%
Total118100.00%6100.00%


static void ps3disk_do_request(struct ps3_storage_device *dev, struct request_queue *q) { struct request *req; dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__); while ((req = blk_fetch_request(q))) { if (req->cmd_flags & REQ_FLUSH) { if (ps3disk_submit_flush_request(dev, req)) break; } else if (req->cmd_type == REQ_TYPE_FS) { if (ps3disk_submit_request_sg(dev, req)) break; } else { blk_dump_rq_flags(req, DEVICE_NAME " bad request"); __blk_end_request_all(req, -EIO); continue; } } }

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geert uytterhoevengeert uytterhoeven9888.29%114.29%
fujita tomonorifujita tomonori65.41%114.29%
tejun heotejun heo43.60%342.86%
jens axboejens axboe21.80%114.29%
christoph hellwigchristoph hellwig10.90%114.29%
Total111100.00%7100.00%


static void ps3disk_request(struct request_queue *q) { struct ps3_storage_device *dev = q->queuedata; struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); if (priv->req) { dev_dbg(&dev->sbd.core, "%s:%u busy\n", __func__, __LINE__); return; } ps3disk_do_request(dev, q); }

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geert uytterhoevengeert uytterhoeven6092.31%250.00%
roel kluinroel kluin34.62%125.00%
jens axboejens axboe23.08%125.00%
Total65100.00%4100.00%


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, 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->cmd_flags & REQ_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 = -EIO; } 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); __blk_end_request_all(req, error); priv->req = NULL; ps3disk_do_request(dev, priv->queue); spin_unlock(&priv->lock); return IRQ_HANDLED; }

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geert uytterhoevengeert uytterhoeven30994.79%228.57%
kiyoshi uedakiyoshi ueda72.15%114.29%
roel kluinroel kluin30.92%114.29%
fujita tomonorifujita tomonori30.92%114.29%
stephen rothwellstephen rothwell30.92%114.29%
tejun heotejun heo10.31%114.29%
Total326100.00%7100.00%


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; }

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geert uytterhoevengeert uytterhoeven7798.72%150.00%
stephen rothwellstephen rothwell11.28%150.00%
Total78100.00%2100.00%

/* 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 */ }

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geert uytterhoevengeert uytterhoeven50100.00%1100.00%
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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]; } }

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geert uytterhoevengeert uytterhoeven79100.00%1100.00%
Total79100.00%1100.00%


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; } }

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geert uytterhoevengeert uytterhoeven77100.00%1100.00%
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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'; }

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geert uytterhoevengeert uytterhoeven87100.00%1100.00%
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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; }

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geert uytterhoevengeert uytterhoeven20698.10%250.00%
roel kluinroel kluin31.43%125.00%
stephen rothwellstephen rothwell10.48%125.00%
Total210100.00%4100.00%

static unsigned long ps3disk_mask; static DEFINE_MUTEX(ps3disk_mask_mutex);
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 request_queue *queue; 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(sizeof(*priv), GFP_KERNEL); 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); queue = blk_init_queue(ps3disk_request, &priv->lock); if (!queue) { dev_err(&dev->sbd.core, "%s:%u: blk_init_queue failed\n", __func__, __LINE__); error = -ENOMEM; goto fail_teardown; } priv->queue = queue; queue->queuedata = dev; blk_queue_bounce_limit(queue, BLK_BOUNCE_HIGH); blk_queue_max_hw_sectors(queue, dev->bounce_size >> 9); blk_queue_segment_boundary(queue, -1UL); blk_queue_dma_alignment(queue, dev->blk_size-1); blk_queue_logical_block_size(queue, dev->blk_size); blk_queue_write_cache(queue, true, false); blk_queue_max_segments(queue, -1); blk_queue_max_segment_size(queue, dev->bounce_size); gendisk = alloc_disk(PS3DISK_MINORS); if (!gendisk) { dev_err(&dev->sbd.core, "%s:%u: alloc_disk failed\n", __func__, __LINE__); error = -ENOMEM; goto fail_cleanup_queue; } priv->gendisk = gendisk; gendisk->major = ps3disk_major; gendisk->first_minor = devidx * PS3DISK_MINORS; gendisk->fops = &ps3disk_fops; gendisk->queue = queue; gendisk->private_data = dev; gendisk->driverfs_dev = &dev->sbd.core; 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, %lu MiB for OtherOS)\n", gendisk->disk_name, priv->model, priv->raw_capacity >> 11, get_capacity(gendisk) >> 11); add_disk(gendisk); return 0; fail_cleanup_queue: blk_cleanup_queue(queue); 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; }

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geert uytterhoevengeert uytterhoeven60097.24%225.00%
roel kluinroel kluin81.30%112.50%
jens axboejens axboe40.65%112.50%
martin k. petersenmartin k. petersen30.49%337.50%
stephen rothwellstephen rothwell20.32%112.50%
Total617100.00%8100.00%


static int 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); blk_cleanup_queue(priv->queue); put_disk(priv->gendisk); 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); return 0; }

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geert uytterhoevengeert uytterhoeven11990.15%250.00%
roel kluinroel kluin75.30%125.00%
tejun heotejun heo64.55%125.00%
Total132100.00%4100.00%

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; }

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geert uytterhoevengeert uytterhoeven93100.00%1100.00%
Total93100.00%1100.00%


static void __exit ps3disk_exit(void) { ps3_system_bus_driver_unregister(&ps3disk); unregister_blkdev(ps3disk_major, DEVICE_NAME); }

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geert uytterhoevengeert uytterhoeven22100.00%1100.00%
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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);

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geert uytterhoevengeert uytterhoeven264294.87%27.41%
neil brownneil brown351.26%13.70%
roel kluinroel kluin301.08%13.70%
tejun heotejun heo301.08%829.63%
stephen rothwellstephen rothwell90.32%13.70%
fujita tomonorifujita tomonori90.32%13.70%
jens axboejens axboe80.29%27.41%
kiyoshi uedakiyoshi ueda70.25%13.70%
kent overstreetkent overstreet60.22%311.11%
paul gortmakerpaul gortmaker30.11%13.70%
martin k. petersenmartin k. petersen30.11%311.11%
christoph hellwigchristoph hellwig10.04%13.70%
alexey dobriyanalexey dobriyan10.04%13.70%
dan carpenterdan carpenter10.04%13.70%
Total2785100.00%27100.00%
Directory: drivers/block
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