| /* 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/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 "1.0" |
| #define DRV_MODULE_RELDATE "June 25, 2007" |
| |
| static char version[] __devinitdata = |
| 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 256 |
| |
| #define WAITING_FOR_LINK_UP 0x01 |
| #define WAITING_FOR_TX_SPACE 0x02 |
| #define WAITING_FOR_GEN_CMD 0x04 |
| #define WAITING_FOR_ANY -1 |
| |
| 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; |
| |
| /* The server fills these in for us in the disk attribute |
| * ACK packet. |
| */ |
| u64 operations; |
| u32 vdisk_size; |
| u8 vdisk_type; |
| |
| char disk_name[32]; |
| |
| struct vio_disk_geom geom; |
| struct vio_disk_vtoc label; |
| }; |
| |
| static inline struct vdc_port *to_vdc_port(struct vio_driver_state *vio) |
| { |
| return container_of(vio, struct vdc_port, vio); |
| } |
| |
| /* Ordered from largest major to lowest */ |
| static struct vio_version vdc_versions[] = { |
| { .major = 1, .minor = 0 }, |
| }; |
| |
| #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); |
| } |
| |
| static int vdc_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
| { |
| struct gendisk *disk = bdev->bd_disk; |
| struct vdc_port *port = disk->private_data; |
| |
| geo->heads = (u8) port->geom.num_hd; |
| geo->sectors = (u8) port->geom.num_sec; |
| geo->cylinders = port->geom.num_cyl; |
| |
| return 0; |
| } |
| |
| static struct block_device_operations vdc_fops = { |
| .owner = THIS_MODULE, |
| .getgeo = vdc_getgeo, |
| }; |
| |
| 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; |
| } |
| } |
| |
| static void vdc_handshake_complete(struct vio_driver_state *vio) |
| { |
| vdc_finish(vio, 0, WAITING_FOR_LINK_UP); |
| } |
| |
| 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; |
| } |
| |
| 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)); |
| } |
| |
| 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] " |
| "xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n", |
| pkt->tag.stype, pkt->operations, |
| pkt->vdisk_size, pkt->vdisk_type, |
| 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_size = pkt->vdisk_size; |
| port->vdisk_type = pkt->vdisk_type; |
| 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; |
| } |
| } |
| |
| 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); |
| } |
| |
| 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 = (index + 1) & (VDC_TX_RING_SIZE - 1); |
| |
| 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); |
| |
| if (blk_queue_stopped(port->disk->queue)) |
| blk_start_queue(port->disk->queue); |
| } |
| |
| 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; |
| } |
| |
| static int vdc_nack(struct vdc_port *port, void *msgbuf) |
| { |
| /* XXX Implement me XXX */ |
| return 0; |
| } |
| |
| 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 || |
| event == LDC_EVENT_UP)) { |
| vio_link_state_change(vio, event); |
| spin_unlock_irqrestore(&vio->lock, flags); |
| return; |
| } |
| |
| if (unlikely(event != LDC_EVENT_DATA_READY)) { |
| printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event); |
| spin_unlock_irqrestore(&vio->lock, flags); |
| return; |
| } |
| |
| 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); |
| spin_unlock_irqrestore(&vio->lock, flags); |
| } |
| |
| 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); |
| |
| return err; |
| } |
| |
| 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; |
| |
| if (unlikely(vdc_tx_dring_avail(dr) < 1)) { |
| blk_stop_queue(port->disk->queue); |
| err = -ENOMEM; |
| goto out; |
| } |
| |
| 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 = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1); |
| } |
| out: |
| |
| return err; |
| } |
| |
| static void do_vdc_request(struct request_queue *q) |
| { |
| while (1) { |
| struct request *req = elv_next_request(q); |
| |
| if (!req) |
| break; |
| |
| blkdev_dequeue_request(req); |
| if (__send_request(req) < 0) |
| __blk_end_request_all(req, -EIO); |
| } |
| } |
| |
| 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 - 1)) & 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 = ∁ |
| |
| 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 = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1); |
| 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; |
| } |
| |
| static int __devinit 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; |
| } |
| |
| 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; |
| } |
| } |
| |
| static int probe_disk(struct vdc_port *port) |
| { |
| struct vio_completion comp; |
| struct request_queue *q; |
| struct gendisk *g; |
| int err; |
| |
| init_completion(&comp.com); |
| comp.err = 0; |
| comp.waiting_for = WAITING_FOR_LINK_UP; |
| port->vio.cmp = ∁ |
| |
| vio_port_up(&port->vio); |
| |
| wait_for_completion(&comp.com); |
| if (comp.err) |
| return comp.err; |
| |
| err = generic_request(port, VD_OP_GET_VTOC, |
| &port->label, sizeof(port->label)); |
| if (err < 0) { |
| printk(KERN_ERR PFX "VD_OP_GET_VTOC returns error %d\n", err); |
| return err; |
| } |
| |
| err = generic_request(port, VD_OP_GET_DISKGEOM, |
| &port->geom, sizeof(port->geom)); |
| if (err < 0) { |
| printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns " |
| "error %d\n", err); |
| return err; |
| } |
| |
| port->vdisk_size = ((u64)port->geom.num_cyl * |
| (u64)port->geom.num_hd * |
| (u64)port->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; |
| |
| blk_queue_max_hw_segments(q, port->ring_cookies); |
| blk_queue_max_phys_segments(q, port->ring_cookies); |
| blk_queue_max_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); |
| |
| printk(KERN_INFO PFX "%s: %u sectors (%u MB)\n", |
| g->disk_name, |
| port->vdisk_size, (port->vdisk_size >> (20 - 9))); |
| |
| add_disk(g); |
| |
| return 0; |
| } |
| |
| 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 __devinit print_version(void) |
| { |
| static int version_printed; |
| |
| if (version_printed++ == 0) |
| printk(KERN_INFO "%s", version); |
| } |
| |
| static int __devinit vdc_port_probe(struct vio_dev *vdev, |
| const struct vio_device_id *id) |
| { |
| struct mdesc_handle *hp; |
| struct vdc_port *port; |
| int err; |
| |
| 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)); |
| |
| 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; |
| } |
| |
| static int vdc_port_remove(struct vio_dev *vdev) |
| { |
| struct vdc_port *port = dev_get_drvdata(&vdev->dev); |
| |
| if (port) { |
| del_timer_sync(&port->vio.timer); |
| |
| vdc_free_tx_ring(port); |
| vio_ldc_free(&port->vio); |
| |
| dev_set_drvdata(&vdev->dev, NULL); |
| |
| kfree(port); |
| } |
| return 0; |
| } |
| |
| 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, |
| .driver = { |
| .name = "vdc_port", |
| .owner = THIS_MODULE, |
| } |
| }; |
| |
| static int __init vdc_init(void) |
| { |
| int err; |
| |
| err = register_blkdev(0, VDCBLK_NAME); |
| if (err < 0) |
| goto out_err; |
| |
| 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_err: |
| return err; |
| } |
| |
| static void __exit vdc_exit(void) |
| { |
| vio_unregister_driver(&vdc_port_driver); |
| unregister_blkdev(vdc_major, VDCBLK_NAME); |
| } |
| |
| module_init(vdc_init); |
| module_exit(vdc_exit); |