| /* -*- linux-c -*- |
| * viodasd.c |
| * Authors: Dave Boutcher <boutcher@us.ibm.com> |
| * Ryan Arnold <ryanarn@us.ibm.com> |
| * Colin Devilbiss <devilbis@us.ibm.com> |
| * Stephen Rothwell <sfr@au1.ibm.com> |
| * |
| * (C) Copyright 2000-2004 IBM Corporation |
| * |
| * 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; either version 2 of the |
| * License, or (at your option) any later version. |
| * |
| * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| * This routine provides access to disk space (termed "DASD" in historical |
| * IBM terms) owned and managed by an OS/400 partition running on the |
| * same box as this Linux partition. |
| * |
| * All disk operations are performed by sending messages back and forth to |
| * the OS/400 partition. |
| */ |
| #include <linux/major.h> |
| #include <linux/fs.h> |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/blkdev.h> |
| #include <linux/genhd.h> |
| #include <linux/hdreg.h> |
| #include <linux/errno.h> |
| #include <linux/init.h> |
| #include <linux/string.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/completion.h> |
| #include <linux/device.h> |
| #include <linux/kernel.h> |
| |
| #include <asm/uaccess.h> |
| #include <asm/vio.h> |
| #include <asm/iSeries/HvTypes.h> |
| #include <asm/iSeries/HvLpEvent.h> |
| #include <asm/iSeries/HvLpConfig.h> |
| #include <asm/iSeries/vio.h> |
| |
| MODULE_DESCRIPTION("iSeries Virtual DASD"); |
| MODULE_AUTHOR("Dave Boutcher"); |
| MODULE_LICENSE("GPL"); |
| |
| /* |
| * We only support 7 partitions per physical disk....so with minor |
| * numbers 0-255 we get a maximum of 32 disks. |
| */ |
| #define VIOD_GENHD_NAME "iseries/vd" |
| #define VIOD_GENHD_DEVFS_NAME "iseries/disc" |
| |
| #define VIOD_VERS "1.64" |
| |
| #define VIOD_KERN_WARNING KERN_WARNING "viod: " |
| #define VIOD_KERN_INFO KERN_INFO "viod: " |
| |
| enum { |
| PARTITION_SHIFT = 3, |
| MAX_DISKNO = HVMAXARCHITECTEDVIRTUALDISKS, |
| MAX_DISK_NAME = sizeof(((struct gendisk *)0)->disk_name) |
| }; |
| |
| static DEFINE_SPINLOCK(viodasd_spinlock); |
| |
| #define VIOMAXREQ 16 |
| #define VIOMAXBLOCKDMA 12 |
| |
| #define DEVICE_NO(cell) ((struct viodasd_device *)(cell) - &viodasd_devices[0]) |
| |
| struct open_data { |
| u64 disk_size; |
| u16 max_disk; |
| u16 cylinders; |
| u16 tracks; |
| u16 sectors; |
| u16 bytes_per_sector; |
| }; |
| |
| struct rw_data { |
| u64 offset; |
| struct { |
| u32 token; |
| u32 reserved; |
| u64 len; |
| } dma_info[VIOMAXBLOCKDMA]; |
| }; |
| |
| struct vioblocklpevent { |
| struct HvLpEvent event; |
| u32 reserved; |
| u16 version; |
| u16 sub_result; |
| u16 disk; |
| u16 flags; |
| union { |
| struct open_data open_data; |
| struct rw_data rw_data; |
| u64 changed; |
| } u; |
| }; |
| |
| #define vioblockflags_ro 0x0001 |
| |
| enum vioblocksubtype { |
| vioblockopen = 0x0001, |
| vioblockclose = 0x0002, |
| vioblockread = 0x0003, |
| vioblockwrite = 0x0004, |
| vioblockflush = 0x0005, |
| vioblockcheck = 0x0007 |
| }; |
| |
| struct viodasd_waitevent { |
| struct completion com; |
| int rc; |
| u16 sub_result; |
| int max_disk; /* open */ |
| }; |
| |
| static const struct vio_error_entry viodasd_err_table[] = { |
| { 0x0201, EINVAL, "Invalid Range" }, |
| { 0x0202, EINVAL, "Invalid Token" }, |
| { 0x0203, EIO, "DMA Error" }, |
| { 0x0204, EIO, "Use Error" }, |
| { 0x0205, EIO, "Release Error" }, |
| { 0x0206, EINVAL, "Invalid Disk" }, |
| { 0x0207, EBUSY, "Cant Lock" }, |
| { 0x0208, EIO, "Already Locked" }, |
| { 0x0209, EIO, "Already Unlocked" }, |
| { 0x020A, EIO, "Invalid Arg" }, |
| { 0x020B, EIO, "Bad IFS File" }, |
| { 0x020C, EROFS, "Read Only Device" }, |
| { 0x02FF, EIO, "Internal Error" }, |
| { 0x0000, 0, NULL }, |
| }; |
| |
| /* |
| * Figure out the biggest I/O request (in sectors) we can accept |
| */ |
| #define VIODASD_MAXSECTORS (4096 / 512 * VIOMAXBLOCKDMA) |
| |
| /* |
| * Number of disk I/O requests we've sent to OS/400 |
| */ |
| static int num_req_outstanding; |
| |
| /* |
| * This is our internal structure for keeping track of disk devices |
| */ |
| struct viodasd_device { |
| u16 cylinders; |
| u16 tracks; |
| u16 sectors; |
| u16 bytes_per_sector; |
| u64 size; |
| int read_only; |
| spinlock_t q_lock; |
| struct gendisk *disk; |
| struct device *dev; |
| } viodasd_devices[MAX_DISKNO]; |
| |
| /* |
| * External open entry point. |
| */ |
| static int viodasd_open(struct inode *ino, struct file *fil) |
| { |
| struct viodasd_device *d = ino->i_bdev->bd_disk->private_data; |
| HvLpEvent_Rc hvrc; |
| struct viodasd_waitevent we; |
| u16 flags = 0; |
| |
| if (d->read_only) { |
| if ((fil != NULL) && (fil->f_mode & FMODE_WRITE)) |
| return -EROFS; |
| flags = vioblockflags_ro; |
| } |
| |
| init_completion(&we.com); |
| |
| /* Send the open event to OS/400 */ |
| hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, |
| HvLpEvent_Type_VirtualIo, |
| viomajorsubtype_blockio | vioblockopen, |
| HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, |
| viopath_sourceinst(viopath_hostLp), |
| viopath_targetinst(viopath_hostLp), |
| (u64)(unsigned long)&we, VIOVERSION << 16, |
| ((u64)DEVICE_NO(d) << 48) | ((u64)flags << 32), |
| 0, 0, 0); |
| if (hvrc != 0) { |
| printk(VIOD_KERN_WARNING "HV open failed %d\n", (int)hvrc); |
| return -EIO; |
| } |
| |
| wait_for_completion(&we.com); |
| |
| /* Check the return code */ |
| if (we.rc != 0) { |
| const struct vio_error_entry *err = |
| vio_lookup_rc(viodasd_err_table, we.sub_result); |
| |
| printk(VIOD_KERN_WARNING |
| "bad rc opening disk: %d:0x%04x (%s)\n", |
| (int)we.rc, we.sub_result, err->msg); |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * External release entry point. |
| */ |
| static int viodasd_release(struct inode *ino, struct file *fil) |
| { |
| struct viodasd_device *d = ino->i_bdev->bd_disk->private_data; |
| HvLpEvent_Rc hvrc; |
| |
| /* Send the event to OS/400. We DON'T expect a response */ |
| hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, |
| HvLpEvent_Type_VirtualIo, |
| viomajorsubtype_blockio | vioblockclose, |
| HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck, |
| viopath_sourceinst(viopath_hostLp), |
| viopath_targetinst(viopath_hostLp), |
| 0, VIOVERSION << 16, |
| ((u64)DEVICE_NO(d) << 48) /* | ((u64)flags << 32) */, |
| 0, 0, 0); |
| if (hvrc != 0) |
| printk(VIOD_KERN_WARNING "HV close call failed %d\n", |
| (int)hvrc); |
| return 0; |
| } |
| |
| |
| /* External ioctl entry point. |
| */ |
| static int viodasd_ioctl(struct inode *ino, struct file *fil, |
| unsigned int cmd, unsigned long arg) |
| { |
| unsigned char sectors; |
| unsigned char heads; |
| unsigned short cylinders; |
| struct hd_geometry *geo; |
| struct gendisk *gendisk; |
| struct viodasd_device *d; |
| |
| switch (cmd) { |
| case HDIO_GETGEO: |
| geo = (struct hd_geometry *)arg; |
| if (geo == NULL) |
| return -EINVAL; |
| if (!access_ok(VERIFY_WRITE, geo, sizeof(*geo))) |
| return -EFAULT; |
| gendisk = ino->i_bdev->bd_disk; |
| d = gendisk->private_data; |
| sectors = d->sectors; |
| if (sectors == 0) |
| sectors = 32; |
| heads = d->tracks; |
| if (heads == 0) |
| heads = 64; |
| cylinders = d->cylinders; |
| if (cylinders == 0) |
| cylinders = get_capacity(gendisk) / (sectors * heads); |
| if (__put_user(sectors, &geo->sectors) || |
| __put_user(heads, &geo->heads) || |
| __put_user(cylinders, &geo->cylinders) || |
| __put_user(get_start_sect(ino->i_bdev), &geo->start)) |
| return -EFAULT; |
| return 0; |
| } |
| |
| return -EINVAL; |
| } |
| |
| /* |
| * Our file operations table |
| */ |
| static struct block_device_operations viodasd_fops = { |
| .owner = THIS_MODULE, |
| .open = viodasd_open, |
| .release = viodasd_release, |
| .ioctl = viodasd_ioctl, |
| }; |
| |
| /* |
| * End a request |
| */ |
| static void viodasd_end_request(struct request *req, int uptodate, |
| int num_sectors) |
| { |
| if (end_that_request_first(req, uptodate, num_sectors)) |
| return; |
| add_disk_randomness(req->rq_disk); |
| end_that_request_last(req); |
| } |
| |
| /* |
| * Send an actual I/O request to OS/400 |
| */ |
| static int send_request(struct request *req) |
| { |
| u64 start; |
| int direction; |
| int nsg; |
| u16 viocmd; |
| HvLpEvent_Rc hvrc; |
| struct vioblocklpevent *bevent; |
| struct scatterlist sg[VIOMAXBLOCKDMA]; |
| int sgindex; |
| int statindex; |
| struct viodasd_device *d; |
| unsigned long flags; |
| |
| start = (u64)req->sector << 9; |
| |
| if (rq_data_dir(req) == READ) { |
| direction = DMA_FROM_DEVICE; |
| viocmd = viomajorsubtype_blockio | vioblockread; |
| statindex = 0; |
| } else { |
| direction = DMA_TO_DEVICE; |
| viocmd = viomajorsubtype_blockio | vioblockwrite; |
| statindex = 1; |
| } |
| |
| d = req->rq_disk->private_data; |
| |
| /* Now build the scatter-gather list */ |
| nsg = blk_rq_map_sg(req->q, req, sg); |
| nsg = dma_map_sg(d->dev, sg, nsg, direction); |
| |
| spin_lock_irqsave(&viodasd_spinlock, flags); |
| num_req_outstanding++; |
| |
| /* This optimization handles a single DMA block */ |
| if (nsg == 1) |
| hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, |
| HvLpEvent_Type_VirtualIo, viocmd, |
| HvLpEvent_AckInd_DoAck, |
| HvLpEvent_AckType_ImmediateAck, |
| viopath_sourceinst(viopath_hostLp), |
| viopath_targetinst(viopath_hostLp), |
| (u64)(unsigned long)req, VIOVERSION << 16, |
| ((u64)DEVICE_NO(d) << 48), start, |
| ((u64)sg_dma_address(&sg[0])) << 32, |
| sg_dma_len(&sg[0])); |
| else { |
| bevent = (struct vioblocklpevent *) |
| vio_get_event_buffer(viomajorsubtype_blockio); |
| if (bevent == NULL) { |
| printk(VIOD_KERN_WARNING |
| "error allocating disk event buffer\n"); |
| goto error_ret; |
| } |
| |
| /* |
| * Now build up the actual request. Note that we store |
| * the pointer to the request in the correlation |
| * token so we can match the response up later |
| */ |
| memset(bevent, 0, sizeof(struct vioblocklpevent)); |
| bevent->event.xFlags.xValid = 1; |
| bevent->event.xFlags.xFunction = HvLpEvent_Function_Int; |
| bevent->event.xFlags.xAckInd = HvLpEvent_AckInd_DoAck; |
| bevent->event.xFlags.xAckType = HvLpEvent_AckType_ImmediateAck; |
| bevent->event.xType = HvLpEvent_Type_VirtualIo; |
| bevent->event.xSubtype = viocmd; |
| bevent->event.xSourceLp = HvLpConfig_getLpIndex(); |
| bevent->event.xTargetLp = viopath_hostLp; |
| bevent->event.xSizeMinus1 = |
| offsetof(struct vioblocklpevent, u.rw_data.dma_info) + |
| (sizeof(bevent->u.rw_data.dma_info[0]) * nsg) - 1; |
| bevent->event.xSourceInstanceId = |
| viopath_sourceinst(viopath_hostLp); |
| bevent->event.xTargetInstanceId = |
| viopath_targetinst(viopath_hostLp); |
| bevent->event.xCorrelationToken = (u64)req; |
| bevent->version = VIOVERSION; |
| bevent->disk = DEVICE_NO(d); |
| bevent->u.rw_data.offset = start; |
| |
| /* |
| * Copy just the dma information from the sg list |
| * into the request |
| */ |
| for (sgindex = 0; sgindex < nsg; sgindex++) { |
| bevent->u.rw_data.dma_info[sgindex].token = |
| sg_dma_address(&sg[sgindex]); |
| bevent->u.rw_data.dma_info[sgindex].len = |
| sg_dma_len(&sg[sgindex]); |
| } |
| |
| /* Send the request */ |
| hvrc = HvCallEvent_signalLpEvent(&bevent->event); |
| vio_free_event_buffer(viomajorsubtype_blockio, bevent); |
| } |
| |
| if (hvrc != HvLpEvent_Rc_Good) { |
| printk(VIOD_KERN_WARNING |
| "error sending disk event to OS/400 (rc %d)\n", |
| (int)hvrc); |
| goto error_ret; |
| } |
| spin_unlock_irqrestore(&viodasd_spinlock, flags); |
| return 0; |
| |
| error_ret: |
| num_req_outstanding--; |
| spin_unlock_irqrestore(&viodasd_spinlock, flags); |
| dma_unmap_sg(d->dev, sg, nsg, direction); |
| return -1; |
| } |
| |
| /* |
| * This is the external request processing routine |
| */ |
| static void do_viodasd_request(request_queue_t *q) |
| { |
| struct request *req; |
| |
| /* |
| * If we already have the maximum number of requests |
| * outstanding to OS/400 just bail out. We'll come |
| * back later. |
| */ |
| while (num_req_outstanding < VIOMAXREQ) { |
| req = elv_next_request(q); |
| if (req == NULL) |
| return; |
| /* dequeue the current request from the queue */ |
| blkdev_dequeue_request(req); |
| /* check that request contains a valid command */ |
| if (!blk_fs_request(req)) { |
| viodasd_end_request(req, 0, req->hard_nr_sectors); |
| continue; |
| } |
| /* Try sending the request */ |
| if (send_request(req) != 0) |
| viodasd_end_request(req, 0, req->hard_nr_sectors); |
| } |
| } |
| |
| /* |
| * Probe a single disk and fill in the viodasd_device structure |
| * for it. |
| */ |
| static void probe_disk(struct viodasd_device *d) |
| { |
| HvLpEvent_Rc hvrc; |
| struct viodasd_waitevent we; |
| int dev_no = DEVICE_NO(d); |
| struct gendisk *g; |
| struct request_queue *q; |
| u16 flags = 0; |
| |
| retry: |
| init_completion(&we.com); |
| |
| /* Send the open event to OS/400 */ |
| hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, |
| HvLpEvent_Type_VirtualIo, |
| viomajorsubtype_blockio | vioblockopen, |
| HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, |
| viopath_sourceinst(viopath_hostLp), |
| viopath_targetinst(viopath_hostLp), |
| (u64)(unsigned long)&we, VIOVERSION << 16, |
| ((u64)dev_no << 48) | ((u64)flags<< 32), |
| 0, 0, 0); |
| if (hvrc != 0) { |
| printk(VIOD_KERN_WARNING "bad rc on HV open %d\n", (int)hvrc); |
| return; |
| } |
| |
| wait_for_completion(&we.com); |
| |
| if (we.rc != 0) { |
| if (flags != 0) |
| return; |
| /* try again with read only flag set */ |
| flags = vioblockflags_ro; |
| goto retry; |
| } |
| if (we.max_disk > (MAX_DISKNO - 1)) { |
| static int warned; |
| |
| if (warned == 0) { |
| warned++; |
| printk(VIOD_KERN_INFO |
| "Only examining the first %d " |
| "of %d disks connected\n", |
| MAX_DISKNO, we.max_disk + 1); |
| } |
| } |
| |
| /* Send the close event to OS/400. We DON'T expect a response */ |
| hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, |
| HvLpEvent_Type_VirtualIo, |
| viomajorsubtype_blockio | vioblockclose, |
| HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck, |
| viopath_sourceinst(viopath_hostLp), |
| viopath_targetinst(viopath_hostLp), |
| 0, VIOVERSION << 16, |
| ((u64)dev_no << 48) | ((u64)flags << 32), |
| 0, 0, 0); |
| if (hvrc != 0) { |
| printk(VIOD_KERN_WARNING |
| "bad rc sending event to OS/400 %d\n", (int)hvrc); |
| return; |
| } |
| /* create the request queue for the disk */ |
| spin_lock_init(&d->q_lock); |
| q = blk_init_queue(do_viodasd_request, &d->q_lock); |
| if (q == NULL) { |
| printk(VIOD_KERN_WARNING "cannot allocate queue for disk %d\n", |
| dev_no); |
| return; |
| } |
| g = alloc_disk(1 << PARTITION_SHIFT); |
| if (g == NULL) { |
| printk(VIOD_KERN_WARNING |
| "cannot allocate disk structure for disk %d\n", |
| dev_no); |
| blk_cleanup_queue(q); |
| return; |
| } |
| |
| d->disk = g; |
| blk_queue_max_hw_segments(q, VIOMAXBLOCKDMA); |
| blk_queue_max_phys_segments(q, VIOMAXBLOCKDMA); |
| blk_queue_max_sectors(q, VIODASD_MAXSECTORS); |
| g->major = VIODASD_MAJOR; |
| g->first_minor = dev_no << PARTITION_SHIFT; |
| if (dev_no >= 26) |
| snprintf(g->disk_name, sizeof(g->disk_name), |
| VIOD_GENHD_NAME "%c%c", |
| 'a' + (dev_no / 26) - 1, 'a' + (dev_no % 26)); |
| else |
| snprintf(g->disk_name, sizeof(g->disk_name), |
| VIOD_GENHD_NAME "%c", 'a' + (dev_no % 26)); |
| snprintf(g->devfs_name, sizeof(g->devfs_name), |
| "%s%d", VIOD_GENHD_DEVFS_NAME, dev_no); |
| g->fops = &viodasd_fops; |
| g->queue = q; |
| g->private_data = d; |
| g->driverfs_dev = d->dev; |
| set_capacity(g, d->size >> 9); |
| |
| printk(VIOD_KERN_INFO "disk %d: %lu sectors (%lu MB) " |
| "CHS=%d/%d/%d sector size %d%s\n", |
| dev_no, (unsigned long)(d->size >> 9), |
| (unsigned long)(d->size >> 20), |
| (int)d->cylinders, (int)d->tracks, |
| (int)d->sectors, (int)d->bytes_per_sector, |
| d->read_only ? " (RO)" : ""); |
| |
| /* register us in the global list */ |
| add_disk(g); |
| } |
| |
| /* returns the total number of scatterlist elements converted */ |
| static int block_event_to_scatterlist(const struct vioblocklpevent *bevent, |
| struct scatterlist *sg, int *total_len) |
| { |
| int i, numsg; |
| const struct rw_data *rw_data = &bevent->u.rw_data; |
| static const int offset = |
| offsetof(struct vioblocklpevent, u.rw_data.dma_info); |
| static const int element_size = sizeof(rw_data->dma_info[0]); |
| |
| numsg = ((bevent->event.xSizeMinus1 + 1) - offset) / element_size; |
| if (numsg > VIOMAXBLOCKDMA) |
| numsg = VIOMAXBLOCKDMA; |
| |
| *total_len = 0; |
| memset(sg, 0, sizeof(sg[0]) * VIOMAXBLOCKDMA); |
| |
| for (i = 0; (i < numsg) && (rw_data->dma_info[i].len > 0); ++i) { |
| sg_dma_address(&sg[i]) = rw_data->dma_info[i].token; |
| sg_dma_len(&sg[i]) = rw_data->dma_info[i].len; |
| *total_len += rw_data->dma_info[i].len; |
| } |
| return i; |
| } |
| |
| /* |
| * Restart all queues, starting with the one _after_ the disk given, |
| * thus reducing the chance of starvation of higher numbered disks. |
| */ |
| static void viodasd_restart_all_queues_starting_from(int first_index) |
| { |
| int i; |
| |
| for (i = first_index + 1; i < MAX_DISKNO; ++i) |
| if (viodasd_devices[i].disk) |
| blk_run_queue(viodasd_devices[i].disk->queue); |
| for (i = 0; i <= first_index; ++i) |
| if (viodasd_devices[i].disk) |
| blk_run_queue(viodasd_devices[i].disk->queue); |
| } |
| |
| /* |
| * For read and write requests, decrement the number of outstanding requests, |
| * Free the DMA buffers we allocated. |
| */ |
| static int viodasd_handle_read_write(struct vioblocklpevent *bevent) |
| { |
| int num_sg, num_sect, pci_direction, total_len; |
| struct request *req; |
| struct scatterlist sg[VIOMAXBLOCKDMA]; |
| struct HvLpEvent *event = &bevent->event; |
| unsigned long irq_flags; |
| struct viodasd_device *d; |
| int error; |
| spinlock_t *qlock; |
| |
| num_sg = block_event_to_scatterlist(bevent, sg, &total_len); |
| num_sect = total_len >> 9; |
| if (event->xSubtype == (viomajorsubtype_blockio | vioblockread)) |
| pci_direction = DMA_FROM_DEVICE; |
| else |
| pci_direction = DMA_TO_DEVICE; |
| req = (struct request *)bevent->event.xCorrelationToken; |
| d = req->rq_disk->private_data; |
| |
| dma_unmap_sg(d->dev, sg, num_sg, pci_direction); |
| |
| /* |
| * Since this is running in interrupt mode, we need to make sure |
| * we're not stepping on any global I/O operations |
| */ |
| spin_lock_irqsave(&viodasd_spinlock, irq_flags); |
| num_req_outstanding--; |
| spin_unlock_irqrestore(&viodasd_spinlock, irq_flags); |
| |
| error = event->xRc != HvLpEvent_Rc_Good; |
| if (error) { |
| const struct vio_error_entry *err; |
| err = vio_lookup_rc(viodasd_err_table, bevent->sub_result); |
| printk(VIOD_KERN_WARNING "read/write error %d:0x%04x (%s)\n", |
| event->xRc, bevent->sub_result, err->msg); |
| num_sect = req->hard_nr_sectors; |
| } |
| qlock = req->q->queue_lock; |
| spin_lock_irqsave(qlock, irq_flags); |
| viodasd_end_request(req, !error, num_sect); |
| spin_unlock_irqrestore(qlock, irq_flags); |
| |
| /* Finally, try to get more requests off of this device's queue */ |
| viodasd_restart_all_queues_starting_from(DEVICE_NO(d)); |
| |
| return 0; |
| } |
| |
| /* This routine handles incoming block LP events */ |
| static void handle_block_event(struct HvLpEvent *event) |
| { |
| struct vioblocklpevent *bevent = (struct vioblocklpevent *)event; |
| struct viodasd_waitevent *pwe; |
| |
| if (event == NULL) |
| /* Notification that a partition went away! */ |
| return; |
| /* First, we should NEVER get an int here...only acks */ |
| if (event->xFlags.xFunction == HvLpEvent_Function_Int) { |
| printk(VIOD_KERN_WARNING |
| "Yikes! got an int in viodasd event handler!\n"); |
| if (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) { |
| event->xRc = HvLpEvent_Rc_InvalidSubtype; |
| HvCallEvent_ackLpEvent(event); |
| } |
| } |
| |
| switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) { |
| case vioblockopen: |
| /* |
| * Handle a response to an open request. We get all the |
| * disk information in the response, so update it. The |
| * correlation token contains a pointer to a waitevent |
| * structure that has a completion in it. update the |
| * return code in the waitevent structure and post the |
| * completion to wake up the guy who sent the request |
| */ |
| pwe = (struct viodasd_waitevent *)event->xCorrelationToken; |
| pwe->rc = event->xRc; |
| pwe->sub_result = bevent->sub_result; |
| if (event->xRc == HvLpEvent_Rc_Good) { |
| const struct open_data *data = &bevent->u.open_data; |
| struct viodasd_device *device = |
| &viodasd_devices[bevent->disk]; |
| device->read_only = |
| bevent->flags & vioblockflags_ro; |
| device->size = data->disk_size; |
| device->cylinders = data->cylinders; |
| device->tracks = data->tracks; |
| device->sectors = data->sectors; |
| device->bytes_per_sector = data->bytes_per_sector; |
| pwe->max_disk = data->max_disk; |
| } |
| complete(&pwe->com); |
| break; |
| case vioblockclose: |
| break; |
| case vioblockread: |
| case vioblockwrite: |
| viodasd_handle_read_write(bevent); |
| break; |
| |
| default: |
| printk(VIOD_KERN_WARNING "invalid subtype!"); |
| if (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) { |
| event->xRc = HvLpEvent_Rc_InvalidSubtype; |
| HvCallEvent_ackLpEvent(event); |
| } |
| } |
| } |
| |
| /* |
| * Get the driver to reprobe for more disks. |
| */ |
| static ssize_t probe_disks(struct device_driver *drv, const char *buf, |
| size_t count) |
| { |
| struct viodasd_device *d; |
| |
| for (d = viodasd_devices; d < &viodasd_devices[MAX_DISKNO]; d++) { |
| if (d->disk == NULL) |
| probe_disk(d); |
| } |
| return count; |
| } |
| static DRIVER_ATTR(probe, S_IWUSR, NULL, probe_disks); |
| |
| static int viodasd_probe(struct vio_dev *vdev, const struct vio_device_id *id) |
| { |
| struct viodasd_device *d = &viodasd_devices[vdev->unit_address]; |
| |
| d->dev = &vdev->dev; |
| probe_disk(d); |
| if (d->disk == NULL) |
| return -ENODEV; |
| return 0; |
| } |
| |
| static int viodasd_remove(struct vio_dev *vdev) |
| { |
| struct viodasd_device *d; |
| |
| d = &viodasd_devices[vdev->unit_address]; |
| if (d->disk) { |
| del_gendisk(d->disk); |
| blk_cleanup_queue(d->disk->queue); |
| put_disk(d->disk); |
| d->disk = NULL; |
| } |
| d->dev = NULL; |
| return 0; |
| } |
| |
| /** |
| * viodasd_device_table: Used by vio.c to match devices that we |
| * support. |
| */ |
| static struct vio_device_id viodasd_device_table[] __devinitdata = { |
| { "viodasd", "" }, |
| { "", "" } |
| }; |
| |
| MODULE_DEVICE_TABLE(vio, viodasd_device_table); |
| static struct vio_driver viodasd_driver = { |
| .id_table = viodasd_device_table, |
| .probe = viodasd_probe, |
| .remove = viodasd_remove, |
| .driver = { |
| .name = "viodasd", |
| } |
| }; |
| |
| /* |
| * Initialize the whole device driver. Handle module and non-module |
| * versions |
| */ |
| static int __init viodasd_init(void) |
| { |
| int rc; |
| |
| /* Try to open to our host lp */ |
| if (viopath_hostLp == HvLpIndexInvalid) |
| vio_set_hostlp(); |
| |
| if (viopath_hostLp == HvLpIndexInvalid) { |
| printk(VIOD_KERN_WARNING "invalid hosting partition\n"); |
| return -EIO; |
| } |
| |
| printk(VIOD_KERN_INFO "vers " VIOD_VERS ", hosting partition %d\n", |
| viopath_hostLp); |
| |
| /* register the block device */ |
| if (register_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME)) { |
| printk(VIOD_KERN_WARNING |
| "Unable to get major number %d for %s\n", |
| VIODASD_MAJOR, VIOD_GENHD_NAME); |
| return -EIO; |
| } |
| /* Actually open the path to the hosting partition */ |
| if (viopath_open(viopath_hostLp, viomajorsubtype_blockio, |
| VIOMAXREQ + 2)) { |
| printk(VIOD_KERN_WARNING |
| "error opening path to host partition %d\n", |
| viopath_hostLp); |
| unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME); |
| return -EIO; |
| } |
| |
| /* Initialize our request handler */ |
| vio_setHandler(viomajorsubtype_blockio, handle_block_event); |
| |
| rc = vio_register_driver(&viodasd_driver); |
| if (rc == 0) |
| driver_create_file(&viodasd_driver.driver, &driver_attr_probe); |
| return rc; |
| } |
| module_init(viodasd_init); |
| |
| void viodasd_exit(void) |
| { |
| driver_remove_file(&viodasd_driver.driver, &driver_attr_probe); |
| vio_unregister_driver(&viodasd_driver); |
| vio_clearHandler(viomajorsubtype_blockio); |
| unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME); |
| viopath_close(viopath_hostLp, viomajorsubtype_blockio, VIOMAXREQ + 2); |
| } |
| |
| module_exit(viodasd_exit); |