cregit-Linux how code gets into the kernel

Release 4.7 drivers/block/sunvdc.c

Directory: drivers/block
/* sunvdc.c: Sun LDOM Virtual Disk Client.
 *
 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <linux/genhd.h>
#include <linux/cdrom.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/scatterlist.h>

#include <asm/vio.h>
#include <asm/ldc.h>


#define DRV_MODULE_NAME		"sunvdc"

#define PFX DRV_MODULE_NAME ": "

#define DRV_MODULE_VERSION	"1.2"

#define DRV_MODULE_RELDATE	"November 24, 2014"


static char version[] =
	DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
MODULE_DESCRIPTION("Sun LDOM virtual disk client driver");
MODULE_LICENSE("GPL");

MODULE_VERSION(DRV_MODULE_VERSION);


#define VDC_TX_RING_SIZE	512


#define WAITING_FOR_LINK_UP	0x01

#define WAITING_FOR_TX_SPACE	0x02

#define WAITING_FOR_GEN_CMD	0x04

#define WAITING_FOR_ANY		-1


static struct workqueue_struct *sunvdc_wq;


struct vdc_req_entry {
	
struct request		*req;
};


struct vdc_port {
	
struct vio_driver_state	vio;

	
struct gendisk		*disk;

	
struct vdc_completion	*cmp;

	
u64			req_id;
	
u64			seq;
	
struct vdc_req_entry	rq_arr[VDC_TX_RING_SIZE];

	
unsigned long		ring_cookies;

	
u64			max_xfer_size;
	
u32			vdisk_block_size;

	
u64			ldc_timeout;
	
struct timer_list	ldc_reset_timer;
	
struct work_struct	ldc_reset_work;

	/* The server fills these in for us in the disk attribute
         * ACK packet.
         */
	
u64			operations;
	
u32			vdisk_size;
	
u8			vdisk_type;
	
u8			vdisk_mtype;

	
char			disk_name[32];
};

static void vdc_ldc_reset(struct vdc_port *port);
static void vdc_ldc_reset_work(struct work_struct *work);
static void vdc_ldc_reset_timer(unsigned long _arg);


static inline struct vdc_port *to_vdc_port(struct vio_driver_state *vio) { return container_of(vio, struct vdc_port, vio); }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller25100.00%1100.00%
Total25100.00%1100.00%

/* Ordered from largest major to lowest */ static struct vio_version vdc_versions[] = { { .major = 1, .minor = 1 }, { .major = 1, .minor = 0 }, };
static inline int vdc_version_supported(struct vdc_port *port, u16 major, u16 minor) { return port->vio.ver.major == major && port->vio.ver.minor >= minor; }

Contributors

PersonTokensPropCommitsCommitProp
allen paisallen pais39100.00%1100.00%
Total39100.00%1100.00%

#define VDCBLK_NAME "vdisk" static int vdc_major; #define PARTITION_SHIFT 3
static inline u32 vdc_tx_dring_avail(struct vio_dring_state *dr) { return vio_dring_avail(dr, VDC_TX_RING_SIZE); }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller20100.00%1100.00%
Total20100.00%1100.00%


static int vdc_getgeo(struct block_device *bdev, struct hd_geometry *geo) { struct gendisk *disk = bdev->bd_disk; sector_t nsect = get_capacity(disk); sector_t cylinders = nsect; geo->heads = 0xff; geo->sectors = 0x3f; sector_div(cylinders, geo->heads * geo->sectors); geo->cylinders = cylinders; if ((sector_t)(geo->cylinders + 1) * geo->heads * geo->sectors < nsect) geo->cylinders = 0xffff; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
allen paisallen pais5352.48%150.00%
david s. millerdavid s. miller4847.52%150.00%
Total101100.00%2100.00%

/* Add ioctl/CDROM_GET_CAPABILITY to support cdrom_id in udev * when vdisk_mtype is VD_MEDIA_TYPE_CD or VD_MEDIA_TYPE_DVD. * Needed to be able to install inside an ldom from an iso image. */
static int vdc_ioctl(struct block_device *bdev, fmode_t mode, unsigned command, unsigned long argument) { int i; struct gendisk *disk; switch (command) { case CDROMMULTISESSION: pr_debug(PFX "Multisession CDs not supported\n"); for (i = 0; i < sizeof(struct cdrom_multisession); i++) if (put_user(0, (char __user *)(argument + i))) return -EFAULT; return 0; case CDROM_GET_CAPABILITY: disk = bdev->bd_disk; if (bdev->bd_disk && (disk->flags & GENHD_FL_CD)) return 0; return -EINVAL; default: pr_debug(PFX "ioctl %08x not supported\n", command); return -EINVAL; } }

Contributors

PersonTokensPropCommitsCommitProp
allen paisallen pais129100.00%1100.00%
Total129100.00%1100.00%

static const struct block_device_operations vdc_fops = { .owner = THIS_MODULE, .getgeo = vdc_getgeo, .ioctl = vdc_ioctl, };
static void vdc_blk_queue_start(struct vdc_port *port) { struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; /* restart blk queue when ring is half emptied. also called after * handshake completes, so check for initial handshake before we've * allocated a disk. */ if (port->disk && blk_queue_stopped(port->disk->queue) && vdc_tx_dring_avail(dr) * 100 / VDC_TX_RING_SIZE >= 50) { blk_start_queue(port->disk->queue); } }

Contributors

PersonTokensPropCommitsCommitProp
dwight engendwight engen64100.00%1100.00%
Total64100.00%1100.00%


static void vdc_finish(struct vio_driver_state *vio, int err, int waiting_for) { if (vio->cmp && (waiting_for == -1 || vio->cmp->waiting_for == waiting_for)) { vio->cmp->err = err; complete(&vio->cmp->com); vio->cmp = NULL; } }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller64100.00%1100.00%
Total64100.00%1100.00%


static void vdc_handshake_complete(struct vio_driver_state *vio) { struct vdc_port *port = to_vdc_port(vio); del_timer(&port->ldc_reset_timer); vdc_finish(vio, 0, WAITING_FOR_LINK_UP); vdc_blk_queue_start(port); }

Contributors

PersonTokensPropCommitsCommitProp
dwight engendwight engen2353.49%150.00%
david s. millerdavid s. miller2046.51%150.00%
Total43100.00%2100.00%


static int vdc_handle_unknown(struct vdc_port *port, void *arg) { struct vio_msg_tag *pkt = arg; printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n", pkt->type, pkt->stype, pkt->stype_env, pkt->sid); printk(KERN_ERR PFX "Resetting connection.\n"); ldc_disconnect(port->vio.lp); return -ECONNRESET; }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller55100.00%1100.00%
Total55100.00%1100.00%


static int vdc_send_attr(struct vio_driver_state *vio) { struct vdc_port *port = to_vdc_port(vio); struct vio_disk_attr_info pkt; memset(&pkt, 0, sizeof(pkt)); pkt.tag.type = VIO_TYPE_CTRL; pkt.tag.stype = VIO_SUBTYPE_INFO; pkt.tag.stype_env = VIO_ATTR_INFO; pkt.tag.sid = vio_send_sid(vio); pkt.xfer_mode = VIO_DRING_MODE; pkt.vdisk_block_size = port->vdisk_block_size; pkt.max_xfer_size = port->max_xfer_size; viodbg(HS, "SEND ATTR xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n", pkt.xfer_mode, pkt.vdisk_block_size, pkt.max_xfer_size); return vio_ldc_send(&port->vio, &pkt, sizeof(pkt)); }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller13099.24%150.00%
sam ravnborgsam ravnborg10.76%150.00%
Total131100.00%2100.00%


static int vdc_handle_attr(struct vio_driver_state *vio, void *arg) { struct vdc_port *port = to_vdc_port(vio); struct vio_disk_attr_info *pkt = arg; viodbg(HS, "GOT ATTR stype[0x%x] ops[%llx] disk_size[%llu] disk_type[%x] " "mtype[0x%x] xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n", pkt->tag.stype, pkt->operations, pkt->vdisk_size, pkt->vdisk_type, pkt->vdisk_mtype, pkt->xfer_mode, pkt->vdisk_block_size, pkt->max_xfer_size); if (pkt->tag.stype == VIO_SUBTYPE_ACK) { switch (pkt->vdisk_type) { case VD_DISK_TYPE_DISK: case VD_DISK_TYPE_SLICE: break; default: printk(KERN_ERR PFX "%s: Bogus vdisk_type 0x%x\n", vio->name, pkt->vdisk_type); return -ECONNRESET; } if (pkt->vdisk_block_size > port->vdisk_block_size) { printk(KERN_ERR PFX "%s: BLOCK size increased " "%u --> %u\n", vio->name, port->vdisk_block_size, pkt->vdisk_block_size); return -ECONNRESET; } port->operations = pkt->operations; port->vdisk_type = pkt->vdisk_type; if (vdc_version_supported(port, 1, 1)) { port->vdisk_size = pkt->vdisk_size; port->vdisk_mtype = pkt->vdisk_mtype; } if (pkt->max_xfer_size < port->max_xfer_size) port->max_xfer_size = pkt->max_xfer_size; port->vdisk_block_size = pkt->vdisk_block_size; return 0; } else { printk(KERN_ERR PFX "%s: Attribute NACK\n", vio->name); return -ECONNRESET; } }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller20587.61%133.33%
allen paisallen pais2811.97%133.33%
sam ravnborgsam ravnborg10.43%133.33%
Total234100.00%3100.00%


static void vdc_end_special(struct vdc_port *port, struct vio_disk_desc *desc) { int err = desc->status; vdc_finish(&port->vio, -err, WAITING_FOR_GEN_CMD); }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller36100.00%1100.00%
Total36100.00%1100.00%


static void vdc_end_one(struct vdc_port *port, struct vio_dring_state *dr, unsigned int index) { struct vio_disk_desc *desc = vio_dring_entry(dr, index); struct vdc_req_entry *rqe = &port->rq_arr[index]; struct request *req; if (unlikely(desc->hdr.state != VIO_DESC_DONE)) return; ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies); desc->hdr.state = VIO_DESC_FREE; dr->cons = vio_dring_next(dr, index); req = rqe->req; if (req == NULL) { vdc_end_special(port, desc); return; } rqe->req = NULL; __blk_end_request(req, (desc->status ? -EIO : 0), desc->size); vdc_blk_queue_start(port); }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller13990.85%120.00%
kiyoshi uedakiyoshi ueda74.58%120.00%
dwight engendwight engen63.92%240.00%
tejun heotejun heo10.65%120.00%
Total153100.00%5100.00%


static int vdc_ack(struct vdc_port *port, void *msgbuf) { struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; struct vio_dring_data *pkt = msgbuf; if (unlikely(pkt->dring_ident != dr->ident || pkt->start_idx != pkt->end_idx || pkt->start_idx >= VDC_TX_RING_SIZE)) return 0; vdc_end_one(port, dr, pkt->start_idx); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller81100.00%1100.00%
Total81100.00%1100.00%


static int vdc_nack(struct vdc_port *port, void *msgbuf) { /* XXX Implement me XXX */ return 0; }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller19100.00%1100.00%
Total19100.00%1100.00%


static void vdc_event(void *arg, int event) { struct vdc_port *port = arg; struct vio_driver_state *vio = &port->vio; unsigned long flags; int err; spin_lock_irqsave(&vio->lock, flags); if (unlikely(event == LDC_EVENT_RESET)) { vio_link_state_change(vio, event); queue_work(sunvdc_wq, &port->ldc_reset_work); goto out; } if (unlikely(event == LDC_EVENT_UP)) { vio_link_state_change(vio, event); goto out; } if (unlikely(event != LDC_EVENT_DATA_READY)) { pr_warn(PFX "Unexpected LDC event %d\n", event); goto out; } err = 0; while (1) { union { struct vio_msg_tag tag; u64 raw[8]; } msgbuf; err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf)); if (unlikely(err < 0)) { if (err == -ECONNRESET) vio_conn_reset(vio); break; } if (err == 0) break; viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n", msgbuf.tag.type, msgbuf.tag.stype, msgbuf.tag.stype_env, msgbuf.tag.sid); err = vio_validate_sid(vio, &msgbuf.tag); if (err < 0) break; if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) { if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) err = vdc_ack(port, &msgbuf); else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) err = vdc_nack(port, &msgbuf); else err = vdc_handle_unknown(port, &msgbuf); } else if (msgbuf.tag.type == VIO_TYPE_CTRL) { err = vio_control_pkt_engine(vio, &msgbuf); } else { err = vdc_handle_unknown(port, &msgbuf); } if (err < 0) break; } if (err < 0) vdc_finish(&port->vio, err, WAITING_FOR_ANY); out: spin_unlock_irqrestore(&vio->lock, flags); }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller34890.62%150.00%
dwight engendwight engen369.38%150.00%
Total384100.00%2100.00%


static int __vdc_tx_trigger(struct vdc_port *port) { struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; struct vio_dring_data hdr = { .tag = { .type = VIO_TYPE_DATA, .stype = VIO_SUBTYPE_INFO, .stype_env = VIO_DRING_DATA, .sid = vio_send_sid(&port->vio), }, .dring_ident = dr->ident, .start_idx = dr->prod, .end_idx = dr->prod, }; int err, delay; hdr.seq = dr->snd_nxt; delay = 1; do { err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); if (err > 0) { dr->snd_nxt++; break; } udelay(delay); if ((delay <<= 1) > 128) delay = 128; } while (err == -EAGAIN); if (err == -ENOTCONN) vdc_ldc_reset(port); return err; }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller16693.26%150.00%
dwight engendwight engen126.74%150.00%
Total178100.00%2100.00%


static int __send_request(struct request *req) { struct vdc_port *port = req->rq_disk->private_data; struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; struct scatterlist sg[port->ring_cookies]; struct vdc_req_entry *rqe; struct vio_disk_desc *desc; unsigned int map_perm; int nsg, err, i; u64 len; u8 op; map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO; if (rq_data_dir(req) == READ) { map_perm |= LDC_MAP_W; op = VD_OP_BREAD; } else { map_perm |= LDC_MAP_R; op = VD_OP_BWRITE; } sg_init_table(sg, port->ring_cookies); nsg = blk_rq_map_sg(req->q, req, sg); len = 0; for (i = 0; i < nsg; i++) len += sg[i].length; desc = vio_dring_cur(dr); err = ldc_map_sg(port->vio.lp, sg, nsg, desc->cookies, port->ring_cookies, map_perm); if (err < 0) { printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err); return err; } rqe = &port->rq_arr[dr->prod]; rqe->req = req; desc->hdr.ack = VIO_ACK_ENABLE; desc->req_id = port->req_id; desc->operation = op; if (port->vdisk_type == VD_DISK_TYPE_DISK) { desc->slice = 0xff; } else { desc->slice = 0; } desc->status = ~0; desc->offset = (blk_rq_pos(req) << 9) / port->vdisk_block_size; desc->size = len; desc->ncookies = err; /* This has to be a non-SMP write barrier because we are writing * to memory which is shared with the peer LDOM. */ wmb(); desc->hdr.state = VIO_DESC_READY; err = __vdc_tx_trigger(port); if (err < 0) { printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err); } else { port->req_id++; dr->prod = vio_dring_next(dr, dr->prod); } return err; }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller35395.41%240.00%
jens axboejens axboe92.43%120.00%
dwight engendwight engen51.35%120.00%
tejun heotejun heo30.81%120.00%
Total370100.00%5100.00%


static void do_vdc_request(struct request_queue *rq) { struct request *req; while ((req = blk_peek_request(rq)) != NULL) { struct vdc_port *port; struct vio_dring_state *dr; port = req->rq_disk->private_data; dr = &port->vio.drings[VIO_DRIVER_TX_RING]; if (unlikely(vdc_tx_dring_avail(dr) < 1)) goto wait; blk_start_request(req); if (__send_request(req) < 0) { blk_requeue_request(rq, req); wait: /* Avoid pointless unplugs. */ blk_stop_queue(rq); break; } } }

Contributors

PersonTokensPropCommitsCommitProp
dwight engendwight engen7468.52%133.33%
david s. millerdavid s. miller3229.63%133.33%
jens axboejens axboe21.85%133.33%
Total108100.00%3100.00%


static int generic_request(struct vdc_port *port, u8 op, void *buf, int len) { struct vio_dring_state *dr; struct vio_completion comp; struct vio_disk_desc *desc; unsigned int map_perm; unsigned long flags; int op_len, err; void *req_buf; if (!(((u64)1 << (u64)op) & port->operations)) return -EOPNOTSUPP; switch (op) { case VD_OP_BREAD: case VD_OP_BWRITE: default: return -EINVAL; case VD_OP_FLUSH: op_len = 0; map_perm = 0; break; case VD_OP_GET_WCE: op_len = sizeof(u32); map_perm = LDC_MAP_W; break; case VD_OP_SET_WCE: op_len = sizeof(u32); map_perm = LDC_MAP_R; break; case VD_OP_GET_VTOC: op_len = sizeof(struct vio_disk_vtoc); map_perm = LDC_MAP_W; break; case VD_OP_SET_VTOC: op_len = sizeof(struct vio_disk_vtoc); map_perm = LDC_MAP_R; break; case VD_OP_GET_DISKGEOM: op_len = sizeof(struct vio_disk_geom); map_perm = LDC_MAP_W; break; case VD_OP_SET_DISKGEOM: op_len = sizeof(struct vio_disk_geom); map_perm = LDC_MAP_R; break; case VD_OP_SCSICMD: op_len = 16; map_perm = LDC_MAP_RW; break; case VD_OP_GET_DEVID: op_len = sizeof(struct vio_disk_devid); map_perm = LDC_MAP_W; break; case VD_OP_GET_EFI: case VD_OP_SET_EFI: return -EOPNOTSUPP; break; }; map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO; op_len = (op_len + 7) & ~7; req_buf = kzalloc(op_len, GFP_KERNEL); if (!req_buf) return -ENOMEM; if (len > op_len) len = op_len; if (map_perm & LDC_MAP_R) memcpy(req_buf, buf, len); spin_lock_irqsave(&port->vio.lock, flags); dr = &port->vio.drings[VIO_DRIVER_TX_RING]; /* XXX If we want to use this code generically we have to * XXX handle TX ring exhaustion etc. */ desc = vio_dring_cur(dr); err = ldc_map_single(port->vio.lp, req_buf, op_len, desc->cookies, port->ring_cookies, map_perm); if (err < 0) { spin_unlock_irqrestore(&port->vio.lock, flags); kfree(req_buf); return err; } init_completion(&comp.com); comp.waiting_for = WAITING_FOR_GEN_CMD; port->vio.cmp = &comp; desc->hdr.ack = VIO_ACK_ENABLE; desc->req_id = port->req_id; desc->operation = op; desc->slice = 0; desc->status = ~0; desc->offset = 0; desc->size = op_len; desc->ncookies = err; /* This has to be a non-SMP write barrier because we are writing * to memory which is shared with the peer LDOM. */ wmb(); desc->hdr.state = VIO_DESC_READY; err = __vdc_tx_trigger(port); if (err >= 0) { port->req_id++; dr->prod = vio_dring_next(dr, dr->prod); spin_unlock_irqrestore(&port->vio.lock, flags); wait_for_completion(&comp.com); err = comp.err; } else { port->vio.cmp = NULL; spin_unlock_irqrestore(&port->vio.lock, flags); } if (map_perm & LDC_MAP_W) memcpy(buf, req_buf, len); kfree(req_buf); return err; }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller57599.14%150.00%
dwight engendwight engen50.86%150.00%
Total580100.00%2100.00%


static int vdc_alloc_tx_ring(struct vdc_port *port) { struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; unsigned long len, entry_size; int ncookies; void *dring; entry_size = sizeof(struct vio_disk_desc) + (sizeof(struct ldc_trans_cookie) * port->ring_cookies); len = (VDC_TX_RING_SIZE * entry_size); ncookies = VIO_MAX_RING_COOKIES; dring = ldc_alloc_exp_dring(port->vio.lp, len, dr->cookies, &ncookies, (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW)); if (IS_ERR(dring)) return PTR_ERR(dring); dr->base = dring; dr->entry_size = entry_size; dr->num_entries = VDC_TX_RING_SIZE; dr->prod = dr->cons = 0; dr->pending = VDC_TX_RING_SIZE; dr->ncookies = ncookies; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller155100.00%1100.00%
Total155100.00%1100.00%


static void vdc_free_tx_ring(struct vdc_port *port) { struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; if (dr->base) { ldc_free_exp_dring(port->vio.lp, dr->base, (dr->entry_size * dr->num_entries), dr->cookies, dr->ncookies); dr->base = NULL; dr->entry_size = 0; dr->num_entries = 0; dr->pending = 0; dr->ncookies = 0; } }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller95100.00%1100.00%
Total95100.00%1100.00%


static int vdc_port_up(struct vdc_port *port) { struct vio_completion comp; init_completion(&comp.com); comp.err = 0; comp.waiting_for = WAITING_FOR_LINK_UP; port->vio.cmp = &comp; vio_port_up(&port->vio); wait_for_completion(&comp.com); return comp.err; }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller6396.92%150.00%
dwight engendwight engen23.08%150.00%
Total65100.00%2100.00%


static void vdc_port_down(struct vdc_port *port) { ldc_disconnect(port->vio.lp); ldc_unbind(port->vio.lp); vdc_free_tx_ring(port); vio_ldc_free(&port->vio); }

Contributors

PersonTokensPropCommitsCommitProp
dwight engendwight engen3788.10%150.00%
allen paisallen pais511.90%150.00%
Total42100.00%2100.00%


static int probe_disk(struct vdc_port *port) { struct request_queue *q; struct gendisk *g; int err; err = vdc_port_up(port); if (err) return err; if (vdc_version_supported(port, 1, 1)) { /* vdisk_size should be set during the handshake, if it wasn't * then the underlying disk is reserved by another system */ if (port->vdisk_size == -1) return -ENODEV; } else { struct vio_disk_geom geom; err = generic_request(port, VD_OP_GET_DISKGEOM, &geom, sizeof(geom)); if (err < 0) { printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns " "error %d\n", err); return err; } port->vdisk_size = ((u64)geom.num_cyl * (u64)geom.num_hd * (u64)geom.num_sec); } q = blk_init_queue(do_vdc_request, &port->vio.lock); if (!q) { printk(KERN_ERR PFX "%s: Could not allocate queue.\n", port->vio.name); return -ENOMEM; } g = alloc_disk(1 << PARTITION_SHIFT); if (!g) { printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n", port->vio.name); blk_cleanup_queue(q); return -ENOMEM; } port->disk = g; /* Each segment in a request is up to an aligned page in size. */ blk_queue_segment_boundary(q, PAGE_SIZE - 1); blk_queue_max_segment_size(q, PAGE_SIZE); blk_queue_max_segments(q, port->ring_cookies); blk_queue_max_hw_sectors(q, port->max_xfer_size); g->major = vdc_major; g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT; strcpy(g->disk_name, port->disk_name); g->fops = &vdc_fops; g->queue = q; g->private_data = port; g->driverfs_dev = &port->vio.vdev->dev; set_capacity(g, port->vdisk_size); if (vdc_version_supported(port, 1, 1)) { switch (port->vdisk_mtype) { case VD_MEDIA_TYPE_CD: pr_info(PFX "Virtual CDROM %s\n", port->disk_name); g->flags |= GENHD_FL_CD; g->flags |= GENHD_FL_REMOVABLE; set_disk_ro(g, 1); break; case VD_MEDIA_TYPE_DVD: pr_info(PFX "Virtual DVD %s\n", port->disk_name); g->flags |= GENHD_FL_CD; g->flags |= GENHD_FL_REMOVABLE; set_disk_ro(g, 1); break; case VD_MEDIA_TYPE_FIXED: pr_info(PFX "Virtual Hard disk %s\n", port->disk_name); break; } } pr_info(PFX "%s: %u sectors (%u MB) protocol %d.%d\n", g->disk_name, port->vdisk_size, (port->vdisk_size >> (20 - 9)), port->vio.ver.major, port->vio.ver.minor); add_disk(g); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller24051.50%225.00%
allen paisallen pais15132.40%225.00%
dwight engendwight engen7315.67%225.00%
martin k. petersenmartin k. petersen20.43%225.00%
Total466100.00%8100.00%

static struct ldc_channel_config vdc_ldc_cfg = { .event = vdc_event, .mtu = 64, .mode = LDC_MODE_UNRELIABLE, }; static struct vio_driver_ops vdc_vio_ops = { .send_attr = vdc_send_attr, .handle_attr = vdc_handle_attr, .handshake_complete = vdc_handshake_complete, };
static void print_version(void) { static int version_printed; if (version_printed++ == 0) printk(KERN_INFO "%s", version); }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller27100.00%1100.00%
Total27100.00%1100.00%


static int vdc_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) { struct mdesc_handle *hp; struct vdc_port *port; int err; const u64 *ldc_timeout; print_version(); hp = mdesc_grab(); err = -ENODEV; if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) { printk(KERN_ERR PFX "Port id [%llu] too large.\n", vdev->dev_no); goto err_out_release_mdesc; } port = kzalloc(sizeof(*port), GFP_KERNEL); err = -ENOMEM; if (!port) { printk(KERN_ERR PFX "Cannot allocate vdc_port.\n"); goto err_out_release_mdesc; } if (vdev->dev_no >= 26) snprintf(port->disk_name, sizeof(port->disk_name), VDCBLK_NAME "%c%c", 'a' + ((int)vdev->dev_no / 26) - 1, 'a' + ((int)vdev->dev_no % 26)); else snprintf(port->disk_name, sizeof(port->disk_name), VDCBLK_NAME "%c", 'a' + ((int)vdev->dev_no % 26)); port->vdisk_size = -1; /* Actual wall time may be double due to do_generic_file_read() doing * a readahead I/O first, and once that fails it will try to read a * single page. */ ldc_timeout = mdesc_get_property(hp, vdev->mp, "vdc-timeout", NULL); port->ldc_timeout = ldc_timeout ? *ldc_timeout : 0; setup_timer(&port->ldc_reset_timer, vdc_ldc_reset_timer, (unsigned long)port); INIT_WORK(&port->ldc_reset_work, vdc_ldc_reset_work); err = vio_driver_init(&port->vio, vdev, VDEV_DISK, vdc_versions, ARRAY_SIZE(vdc_versions), &vdc_vio_ops, port->disk_name); if (err) goto err_out_free_port; port->vdisk_block_size = 512; port->max_xfer_size = ((128 * 1024) / port->vdisk_block_size); port->ring_cookies = ((port->max_xfer_size * port->vdisk_block_size) / PAGE_SIZE) + 2; err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port); if (err) goto err_out_free_port; err = vdc_alloc_tx_ring(port); if (err) goto err_out_free_ldc; err = probe_disk(port); if (err) goto err_out_free_tx_ring; dev_set_drvdata(&vdev->dev, port); mdesc_release(hp); return 0; err_out_free_tx_ring: vdc_free_tx_ring(port); err_out_free_ldc: vio_ldc_free(&port->vio); err_out_free_port: kfree(port); err_out_release_mdesc: mdesc_release(hp); return err; }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller36884.79%457.14%
dwight engendwight engen5813.36%114.29%
allen paisallen pais71.61%114.29%
sam ravnborgsam ravnborg10.23%114.29%
Total434100.00%7100.00%


static int vdc_port_remove(struct vio_dev *vdev) { struct vdc_port *port = dev_get_drvdata(&vdev->dev); if (port) { unsigned long flags; spin_lock_irqsave(&port->vio.lock, flags); blk_stop_queue(port->disk->queue); spin_unlock_irqrestore(&port->vio.lock, flags); flush_work(&port->ldc_reset_work); del_timer_sync(&port->ldc_reset_timer); del_timer_sync(&port->vio.timer); del_gendisk(port->disk); blk_cleanup_queue(port->disk->queue); put_disk(port->disk); port->disk = NULL; vdc_free_tx_ring(port); vio_ldc_free(&port->vio); dev_set_drvdata(&vdev->dev, NULL); kfree(port); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
dwight engendwight engen8253.59%266.67%
david s. millerdavid s. miller7146.41%133.33%
Total153100.00%3100.00%


static void vdc_requeue_inflight(struct vdc_port *port) { struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; u32 idx; for (idx = dr->cons; idx != dr->prod; idx = vio_dring_next(dr, idx)) { struct vio_disk_desc *desc = vio_dring_entry(dr, idx); struct vdc_req_entry *rqe = &port->rq_arr[idx]; struct request *req; ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies); desc->hdr.state = VIO_DESC_FREE; dr->cons = vio_dring_next(dr, idx); req = rqe->req; if (req == NULL) { vdc_end_special(port, desc); continue; } rqe->req = NULL; blk_requeue_request(port->disk->queue, req); } }

Contributors

PersonTokensPropCommitsCommitProp
dwight engendwight engen14591.19%150.00%
david s. millerdavid s. miller148.81%150.00%
Total159100.00%2100.00%


static void vdc_queue_drain(struct vdc_port *port) { struct request *req; while ((req = blk_fetch_request(port->disk->queue)) != NULL) __blk_end_request_all(req, -EIO); }

Contributors

PersonTokensPropCommitsCommitProp
dwight engendwight engen41100.00%1100.00%
Total41100.00%1100.00%


static void vdc_ldc_reset_timer(unsigned long _arg) { struct vdc_port *port = (struct vdc_port *) _arg; struct vio_driver_state *vio = &port->vio; unsigned long flags; spin_lock_irqsave(&vio->lock, flags); if (!(port->vio.hs_state & VIO_HS_COMPLETE)) { pr_warn(PFX "%s ldc down %llu seconds, draining queue\n", port->disk_name, port->ldc_timeout); vdc_queue_drain(port); vdc_blk_queue_start(port); } spin_unlock_irqrestore(&vio->lock, flags); }

Contributors

PersonTokensPropCommitsCommitProp
dwight engendwight engen95100.00%1100.00%
Total95100.00%1100.00%


static void vdc_ldc_reset_work(struct work_struct *work) { struct vdc_port *port; struct vio_driver_state *vio; unsigned long flags; port = container_of(work, struct vdc_port, ldc_reset_work); vio = &port->vio; spin_lock_irqsave(&vio->lock, flags); vdc_ldc_reset(port); spin_unlock_irqrestore(&vio->lock, flags); }

Contributors

PersonTokensPropCommitsCommitProp
dwight engendwight engen69100.00%1100.00%
Total69100.00%1100.00%


static void vdc_ldc_reset(struct vdc_port *port) { int err; assert_spin_locked(&port->vio.lock); pr_warn(PFX "%s ldc link reset\n", port->disk_name); blk_stop_queue(port->disk->queue); vdc_requeue_inflight(port); vdc_port_down(port); err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port); if (err) { pr_err(PFX "%s vio_ldc_alloc:%d\n", port->disk_name, err); return; } err = vdc_alloc_tx_ring(port); if (err) { pr_err(PFX "%s vio_alloc_tx_ring:%d\n", port->disk_name, err); goto err_free_ldc; } if (port->ldc_timeout) mod_timer(&port->ldc_reset_timer, round_jiffies(jiffies + HZ * port->ldc_timeout)); mod_timer(&port->vio.timer, round_jiffies(jiffies + HZ)); return; err_free_ldc: vio_ldc_free(&port->vio); }

Contributors

PersonTokensPropCommitsCommitProp
dwight engendwight engen168100.00%1100.00%
Total168100.00%1100.00%

static const struct vio_device_id vdc_port_match[] = { { .type = "vdc-port", }, {}, }; MODULE_DEVICE_TABLE(vio, vdc_port_match); static struct vio_driver vdc_port_driver = { .id_table = vdc_port_match, .probe = vdc_port_probe, .remove = vdc_port_remove, .name = "vdc_port", };
static int __init vdc_init(void) { int err; sunvdc_wq = alloc_workqueue("sunvdc", 0, 0); if (!sunvdc_wq) return -ENOMEM; err = register_blkdev(0, VDCBLK_NAME); if (err < 0) goto out_free_wq; vdc_major = err; err = vio_register_driver(&vdc_port_driver); if (err) goto out_unregister_blkdev; return 0; out_unregister_blkdev: unregister_blkdev(vdc_major, VDCBLK_NAME); vdc_major = 0; out_free_wq: destroy_workqueue(sunvdc_wq); return err; }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller6871.58%266.67%
dwight engendwight engen2728.42%133.33%
Total95100.00%3100.00%


static void __exit vdc_exit(void) { vio_unregister_driver(&vdc_port_driver); unregister_blkdev(vdc_major, VDCBLK_NAME); destroy_workqueue(sunvdc_wq); }

Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller2281.48%150.00%
dwight engendwight engen518.52%150.00%
Total27100.00%2100.00%

module_init(vdc_init); module_exit(vdc_exit);

Overall Contributors

PersonTokensPropCommitsCommitProp
david s. millerdavid s. miller373370.25%729.17%
dwight engendwight engen111621.00%520.83%
allen paisallen pais4368.20%28.33%
jens axboejens axboe110.21%28.33%
kiyoshi uedakiyoshi ueda70.13%14.17%
tejun heotejun heo40.08%28.33%
sam ravnborgsam ravnborg30.06%14.17%
martin k. petersenmartin k. petersen20.04%28.33%
alexey dobriyanalexey dobriyan10.02%14.17%
benjamin herrenschmidtbenjamin herrenschmidt10.02%14.17%
greg kroah-hartmangreg kroah-hartman0.00%00.00%
Total5314100.00%24100.00%
Directory: drivers/block
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
{% endraw %}