diff options
Diffstat (limited to 'drivers/block/cciss_scsi.c')
| -rw-r--r-- | drivers/block/cciss_scsi.c | 1657 |
1 files changed, 1657 insertions, 0 deletions
diff --git a/drivers/block/cciss_scsi.c b/drivers/block/cciss_scsi.c new file mode 100644 index 0000000..a3fd87b --- /dev/null +++ b/drivers/block/cciss_scsi.c @@ -0,0 +1,1657 @@ +/* + * Disk Array driver for HP Smart Array controllers, SCSI Tape module. + * (C) Copyright 2001, 2007 Hewlett-Packard Development Company, L.P. + * + * 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., 59 Temple Place, Suite 300, Boston, MA + * 02111-1307, USA. + * + * Questions/Comments/Bugfixes to iss_storagedev@hp.com + * + * Author: Stephen M. Cameron + */ +#ifdef CONFIG_CISS_SCSI_TAPE + +/* Here we have code to present the driver as a scsi driver + as it is simultaneously presented as a block driver. The + reason for doing this is to allow access to SCSI tape drives + through the array controller. Note in particular, neither + physical nor logical disks are presented through the scsi layer. */ + +#include <linux/timer.h> +#include <linux/completion.h> +#include <linux/slab.h> +#include <linux/string.h> + +#include <asm/atomic.h> + +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_host.h> + +#include "cciss_scsi.h" + +#define CCISS_ABORT_MSG 0x00 +#define CCISS_RESET_MSG 0x01 + +/* some prototypes... */ +static int sendcmd( + __u8 cmd, + int ctlr, + void *buff, + size_t size, + unsigned int use_unit_num, /* 0: address the controller, + 1: address logical volume log_unit, + 2: address is in scsi3addr */ + unsigned int log_unit, + __u8 page_code, + unsigned char *scsi3addr, + int cmd_type); + + +static int cciss_scsi_proc_info( + struct Scsi_Host *sh, + char *buffer, /* data buffer */ + char **start, /* where data in buffer starts */ + off_t offset, /* offset from start of imaginary file */ + int length, /* length of data in buffer */ + int func); /* 0 == read, 1 == write */ + +static int cciss_scsi_queue_command (struct scsi_cmnd *cmd, + void (* done)(struct scsi_cmnd *)); +static int cciss_eh_device_reset_handler(struct scsi_cmnd *); +static int cciss_eh_abort_handler(struct scsi_cmnd *); + +static struct cciss_scsi_hba_t ccissscsi[MAX_CTLR] = { + { .name = "cciss0", .ndevices = 0 }, + { .name = "cciss1", .ndevices = 0 }, + { .name = "cciss2", .ndevices = 0 }, + { .name = "cciss3", .ndevices = 0 }, + { .name = "cciss4", .ndevices = 0 }, + { .name = "cciss5", .ndevices = 0 }, + { .name = "cciss6", .ndevices = 0 }, + { .name = "cciss7", .ndevices = 0 }, +}; + +static struct scsi_host_template cciss_driver_template = { + .module = THIS_MODULE, + .name = "cciss", + .proc_name = "cciss", + .proc_info = cciss_scsi_proc_info, + .queuecommand = cciss_scsi_queue_command, + .can_queue = SCSI_CCISS_CAN_QUEUE, + .this_id = 7, + .sg_tablesize = MAXSGENTRIES, + .cmd_per_lun = 1, + .use_clustering = DISABLE_CLUSTERING, + /* Can't have eh_bus_reset_handler or eh_host_reset_handler for cciss */ + .eh_device_reset_handler= cciss_eh_device_reset_handler, + .eh_abort_handler = cciss_eh_abort_handler, +}; + +#pragma pack(1) +struct cciss_scsi_cmd_stack_elem_t { + CommandList_struct cmd; + ErrorInfo_struct Err; + __u32 busaddr; + __u32 pad; +}; + +#pragma pack() + +#define CMD_STACK_SIZE (SCSI_CCISS_CAN_QUEUE * \ + CCISS_MAX_SCSI_DEVS_PER_HBA + 2) + // plus two for init time usage + +#pragma pack(1) +struct cciss_scsi_cmd_stack_t { + struct cciss_scsi_cmd_stack_elem_t *pool; + struct cciss_scsi_cmd_stack_elem_t *elem[CMD_STACK_SIZE]; + dma_addr_t cmd_pool_handle; + int top; +}; +#pragma pack() + +struct cciss_scsi_adapter_data_t { + struct Scsi_Host *scsi_host; + struct cciss_scsi_cmd_stack_t cmd_stack; + int registered; + spinlock_t lock; // to protect ccissscsi[ctlr]; +}; + +#define CPQ_TAPE_LOCK(ctlr, flags) spin_lock_irqsave( \ + &(((struct cciss_scsi_adapter_data_t *) \ + hba[ctlr]->scsi_ctlr)->lock), flags); +#define CPQ_TAPE_UNLOCK(ctlr, flags) spin_unlock_irqrestore( \ + &(((struct cciss_scsi_adapter_data_t *) \ + hba[ctlr]->scsi_ctlr)->lock), flags); + +static CommandList_struct * +scsi_cmd_alloc(ctlr_info_t *h) +{ + /* assume only one process in here at a time, locking done by caller. */ + /* use CCISS_LOCK(ctlr) */ + /* might be better to rewrite how we allocate scsi commands in a way that */ + /* needs no locking at all. */ + + /* take the top memory chunk off the stack and return it, if any. */ + struct cciss_scsi_cmd_stack_elem_t *c; + struct cciss_scsi_adapter_data_t *sa; + struct cciss_scsi_cmd_stack_t *stk; + u64bit temp64; + + sa = (struct cciss_scsi_adapter_data_t *) h->scsi_ctlr; + stk = &sa->cmd_stack; + + if (stk->top < 0) + return NULL; + c = stk->elem[stk->top]; + /* memset(c, 0, sizeof(*c)); */ + memset(&c->cmd, 0, sizeof(c->cmd)); + memset(&c->Err, 0, sizeof(c->Err)); + /* set physical addr of cmd and addr of scsi parameters */ + c->cmd.busaddr = c->busaddr; + /* (__u32) (stk->cmd_pool_handle + + (sizeof(struct cciss_scsi_cmd_stack_elem_t)*stk->top)); */ + + temp64.val = (__u64) (c->busaddr + sizeof(CommandList_struct)); + /* (__u64) (stk->cmd_pool_handle + + (sizeof(struct cciss_scsi_cmd_stack_elem_t)*stk->top) + + sizeof(CommandList_struct)); */ + stk->top--; + c->cmd.ErrDesc.Addr.lower = temp64.val32.lower; + c->cmd.ErrDesc.Addr.upper = temp64.val32.upper; + c->cmd.ErrDesc.Len = sizeof(ErrorInfo_struct); + + c->cmd.ctlr = h->ctlr; + c->cmd.err_info = &c->Err; + + return (CommandList_struct *) c; +} + +static void +scsi_cmd_free(ctlr_info_t *h, CommandList_struct *cmd) +{ + /* assume only one process in here at a time, locking done by caller. */ + /* use CCISS_LOCK(ctlr) */ + /* drop the free memory chunk on top of the stack. */ + + struct cciss_scsi_adapter_data_t *sa; + struct cciss_scsi_cmd_stack_t *stk; + + sa = (struct cciss_scsi_adapter_data_t *) h->scsi_ctlr; + stk = &sa->cmd_stack; + if (stk->top >= CMD_STACK_SIZE) { + printk("cciss: scsi_cmd_free called too many times.\n"); + BUG(); + } + stk->top++; + stk->elem[stk->top] = (struct cciss_scsi_cmd_stack_elem_t *) cmd; +} + +static int +scsi_cmd_stack_setup(int ctlr, struct cciss_scsi_adapter_data_t *sa) +{ + int i; + struct cciss_scsi_cmd_stack_t *stk; + size_t size; + + stk = &sa->cmd_stack; + size = sizeof(struct cciss_scsi_cmd_stack_elem_t) * CMD_STACK_SIZE; + + // pci_alloc_consistent guarantees 32-bit DMA address will + // be used + + stk->pool = (struct cciss_scsi_cmd_stack_elem_t *) + pci_alloc_consistent(hba[ctlr]->pdev, size, &stk->cmd_pool_handle); + + if (stk->pool == NULL) { + printk("stk->pool is null\n"); + return -1; + } + + for (i=0; i<CMD_STACK_SIZE; i++) { + stk->elem[i] = &stk->pool[i]; + stk->elem[i]->busaddr = (__u32) (stk->cmd_pool_handle + + (sizeof(struct cciss_scsi_cmd_stack_elem_t) * i)); + } + stk->top = CMD_STACK_SIZE-1; + return 0; +} + +static void +scsi_cmd_stack_free(int ctlr) +{ + struct cciss_scsi_adapter_data_t *sa; + struct cciss_scsi_cmd_stack_t *stk; + size_t size; + + sa = (struct cciss_scsi_adapter_data_t *) hba[ctlr]->scsi_ctlr; + stk = &sa->cmd_stack; + if (stk->top != CMD_STACK_SIZE-1) { + printk( "cciss: %d scsi commands are still outstanding.\n", + CMD_STACK_SIZE - stk->top); + // BUG(); + printk("WE HAVE A BUG HERE!!! stk=0x%p\n", stk); + } + size = sizeof(struct cciss_scsi_cmd_stack_elem_t) * CMD_STACK_SIZE; + + pci_free_consistent(hba[ctlr]->pdev, size, stk->pool, stk->cmd_pool_handle); + stk->pool = NULL; +} + +#if 0 +static int xmargin=8; +static int amargin=60; + +static void +print_bytes (unsigned char *c, int len, int hex, int ascii) +{ + + int i; + unsigned char *x; + + if (hex) + { + x = c; + for (i=0;i<len;i++) + { + if ((i % xmargin) == 0 && i>0) printk("\n"); + if ((i % xmargin) == 0) printk("0x%04x:", i); + printk(" %02x", *x); + x++; + } + printk("\n"); + } + if (ascii) + { + x = c; + for (i=0;i<len;i++) + { + if ((i % amargin) == 0 && i>0) printk("\n"); + if ((i % amargin) == 0) printk("0x%04x:", i); + if (*x > 26 && *x < 128) printk("%c", *x); + else printk("."); + x++; + } + printk("\n"); + } +} + +static void +print_cmd(CommandList_struct *cp) +{ + printk("queue:%d\n", cp->Header.ReplyQueue); + printk("sglist:%d\n", cp->Header.SGList); + printk("sgtot:%d\n", cp->Header.SGTotal); + printk("Tag:0x%08x/0x%08x\n", cp->Header.Tag.upper, + cp->Header.Tag.lower); + printk("LUN:0x%02x%02x%02x%02x%02x%02x%02x%02x\n", + cp->Header.LUN.LunAddrBytes[0], + cp->Header.LUN.LunAddrBytes[1], + cp->Header.LUN.LunAddrBytes[2], + cp->Header.LUN.LunAddrBytes[3], + cp->Header.LUN.LunAddrBytes[4], + cp->Header.LUN.LunAddrBytes[5], + cp->Header.LUN.LunAddrBytes[6], + cp->Header.LUN.LunAddrBytes[7]); + printk("CDBLen:%d\n", cp->Request.CDBLen); + printk("Type:%d\n",cp->Request.Type.Type); + printk("Attr:%d\n",cp->Request.Type.Attribute); + printk(" Dir:%d\n",cp->Request.Type.Direction); + printk("Timeout:%d\n",cp->Request.Timeout); + printk( "CDB: %02x %02x %02x %02x %02x %02x %02x %02x" + " %02x %02x %02x %02x %02x %02x %02x %02x\n", + cp->Request.CDB[0], cp->Request.CDB[1], + cp->Request.CDB[2], cp->Request.CDB[3], + cp->Request.CDB[4], cp->Request.CDB[5], + cp->Request.CDB[6], cp->Request.CDB[7], + cp->Request.CDB[8], cp->Request.CDB[9], + cp->Request.CDB[10], cp->Request.CDB[11], + cp->Request.CDB[12], cp->Request.CDB[13], + cp->Request.CDB[14], cp->Request.CDB[15]), + printk("edesc.Addr: 0x%08x/0%08x, Len = %d\n", + cp->ErrDesc.Addr.upper, cp->ErrDesc.Addr.lower, + cp->ErrDesc.Len); + printk("sgs..........Errorinfo:\n"); + printk("scsistatus:%d\n", cp->err_info->ScsiStatus); + printk("senselen:%d\n", cp->err_info->SenseLen); + printk("cmd status:%d\n", cp->err_info->CommandStatus); + printk("resid cnt:%d\n", cp->err_info->ResidualCnt); + printk("offense size:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_size); + printk("offense byte:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_num); + printk("offense value:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_value); + +} + +#endif + +static int +find_bus_target_lun(int ctlr, int *bus, int *target, int *lun) +{ + /* finds an unused bus, target, lun for a new device */ + /* assumes hba[ctlr]->scsi_ctlr->lock is held */ + int i, found=0; + unsigned char target_taken[CCISS_MAX_SCSI_DEVS_PER_HBA]; + + memset(&target_taken[0], 0, CCISS_MAX_SCSI_DEVS_PER_HBA); + + target_taken[SELF_SCSI_ID] = 1; + for (i=0;i<ccissscsi[ctlr].ndevices;i++) + target_taken[ccissscsi[ctlr].dev[i].target] = 1; + + for (i=0;i<CCISS_MAX_SCSI_DEVS_PER_HBA;i++) { + if (!target_taken[i]) { + *bus = 0; *target=i; *lun = 0; found=1; + break; + } + } + return (!found); +} +struct scsi2map { + char scsi3addr[8]; + int bus, target, lun; +}; + +static int +cciss_scsi_add_entry(int ctlr, int hostno, + struct cciss_scsi_dev_t *device, + struct scsi2map *added, int *nadded) +{ + /* assumes hba[ctlr]->scsi_ctlr->lock is held */ + int n = ccissscsi[ctlr].ndevices; + struct cciss_scsi_dev_t *sd; + int i, bus, target, lun; + unsigned char addr1[8], addr2[8]; + + if (n >= CCISS_MAX_SCSI_DEVS_PER_HBA) { + printk("cciss%d: Too many devices, " + "some will be inaccessible.\n", ctlr); + return -1; + } + + bus = target = -1; + lun = 0; + /* Is this device a non-zero lun of a multi-lun device */ + /* byte 4 of the 8-byte LUN addr will contain the logical unit no. */ + if (device->scsi3addr[4] != 0) { + /* Search through our list and find the device which */ + /* has the same 8 byte LUN address, excepting byte 4. */ + /* Assign the same bus and target for this new LUN. */ + /* Use the logical unit number from the firmware. */ + memcpy(addr1, device->scsi3addr, 8); + addr1[4] = 0; + for (i = 0; i < n; i++) { + sd = &ccissscsi[ctlr].dev[i]; + memcpy(addr2, sd->scsi3addr, 8); + addr2[4] = 0; + /* differ only in byte 4? */ + if (memcmp(addr1, addr2, 8) == 0) { + bus = sd->bus; + target = sd->target; + lun = device->scsi3addr[4]; + break; + } + } + } + + sd = &ccissscsi[ctlr].dev[n]; + if (lun == 0) { + if (find_bus_target_lun(ctlr, + &sd->bus, &sd->target, &sd->lun) != 0) + return -1; + } else { + sd->bus = bus; + sd->target = target; + sd->lun = lun; + } + added[*nadded].bus = sd->bus; + added[*nadded].target = sd->target; + added[*nadded].lun = sd->lun; + (*nadded)++; + + memcpy(sd->scsi3addr, device->scsi3addr, 8); + memcpy(sd->vendor, device->vendor, sizeof(sd->vendor)); + memcpy(sd->revision, device->revision, sizeof(sd->revision)); + memcpy(sd->device_id, device->device_id, sizeof(sd->device_id)); + sd->devtype = device->devtype; + + ccissscsi[ctlr].ndevices++; + + /* initially, (before registering with scsi layer) we don't + know our hostno and we don't want to print anything first + time anyway (the scsi layer's inquiries will show that info) */ + if (hostno != -1) + printk("cciss%d: %s device c%db%dt%dl%d added.\n", + ctlr, scsi_device_type(sd->devtype), hostno, + sd->bus, sd->target, sd->lun); + return 0; +} + +static void +cciss_scsi_remove_entry(int ctlr, int hostno, int entry, + struct scsi2map *removed, int *nremoved) +{ + /* assumes hba[ctlr]->scsi_ctlr->lock is held */ + int i; + struct cciss_scsi_dev_t sd; + + if (entry < 0 || entry >= CCISS_MAX_SCSI_DEVS_PER_HBA) return; + sd = ccissscsi[ctlr].dev[entry]; + removed[*nremoved].bus = sd.bus; + removed[*nremoved].target = sd.target; + removed[*nremoved].lun = sd.lun; + (*nremoved)++; + for (i=entry;i<ccissscsi[ctlr].ndevices-1;i++) + ccissscsi[ctlr].dev[i] = ccissscsi[ctlr].dev[i+1]; + ccissscsi[ctlr].ndevices--; + printk("cciss%d: %s device c%db%dt%dl%d removed.\n", + ctlr, scsi_device_type(sd.devtype), hostno, + sd.bus, sd.target, sd.lun); +} + + +#define SCSI3ADDR_EQ(a,b) ( \ + (a)[7] == (b)[7] && \ + (a)[6] == (b)[6] && \ + (a)[5] == (b)[5] && \ + (a)[4] == (b)[4] && \ + (a)[3] == (b)[3] && \ + (a)[2] == (b)[2] && \ + (a)[1] == (b)[1] && \ + (a)[0] == (b)[0]) + +static void fixup_botched_add(int ctlr, char *scsi3addr) +{ + /* called when scsi_add_device fails in order to re-adjust */ + /* ccissscsi[] to match the mid layer's view. */ + unsigned long flags; + int i, j; + CPQ_TAPE_LOCK(ctlr, flags); + for (i = 0; i < ccissscsi[ctlr].ndevices; i++) { + if (memcmp(scsi3addr, + ccissscsi[ctlr].dev[i].scsi3addr, 8) == 0) { + for (j = i; j < ccissscsi[ctlr].ndevices-1; j++) + ccissscsi[ctlr].dev[j] = + ccissscsi[ctlr].dev[j+1]; + ccissscsi[ctlr].ndevices--; + break; + } + } + CPQ_TAPE_UNLOCK(ctlr, flags); +} + +static int device_is_the_same(struct cciss_scsi_dev_t *dev1, + struct cciss_scsi_dev_t *dev2) +{ + return dev1->devtype == dev2->devtype && + memcmp(dev1->scsi3addr, dev2->scsi3addr, + sizeof(dev1->scsi3addr)) == 0 && + memcmp(dev1->device_id, dev2->device_id, + sizeof(dev1->device_id)) == 0 && + memcmp(dev1->vendor, dev2->vendor, + sizeof(dev1->vendor)) == 0 && + memcmp(dev1->model, dev2->model, + sizeof(dev1->model)) == 0 && + memcmp(dev1->revision, dev2->revision, + sizeof(dev1->revision)) == 0; +} + +static int +adjust_cciss_scsi_table(int ctlr, int hostno, + struct cciss_scsi_dev_t sd[], int nsds) +{ + /* sd contains scsi3 addresses and devtypes, but + bus target and lun are not filled in. This funciton + takes what's in sd to be the current and adjusts + ccissscsi[] to be in line with what's in sd. */ + + int i,j, found, changes=0; + struct cciss_scsi_dev_t *csd; + unsigned long flags; + struct scsi2map *added, *removed; + int nadded, nremoved; + struct Scsi_Host *sh = NULL; + + added = kzalloc(sizeof(*added) * CCISS_MAX_SCSI_DEVS_PER_HBA, + GFP_KERNEL); + removed = kzalloc(sizeof(*removed) * CCISS_MAX_SCSI_DEVS_PER_HBA, + GFP_KERNEL); + + if (!added || !removed) { + printk(KERN_WARNING "cciss%d: Out of memory in " + "adjust_cciss_scsi_table\n", ctlr); + goto free_and_out; + } + + CPQ_TAPE_LOCK(ctlr, flags); + + if (hostno != -1) /* if it's not the first time... */ + sh = ((struct cciss_scsi_adapter_data_t *) + hba[ctlr]->scsi_ctlr)->scsi_host; + + /* find any devices in ccissscsi[] that are not in + sd[] and remove them from ccissscsi[] */ + + i = 0; + nremoved = 0; + nadded = 0; + while(i<ccissscsi[ctlr].ndevices) { + csd = &ccissscsi[ctlr].dev[i]; + found=0; + for (j=0;j<nsds;j++) { + if (SCSI3ADDR_EQ(sd[j].scsi3addr, + csd->scsi3addr)) { + if (device_is_the_same(&sd[j], csd)) + found=2; + else + found=1; + break; + } + } + + if (found == 0) { /* device no longer present. */ + changes++; + /* printk("cciss%d: %s device c%db%dt%dl%d removed.\n", + ctlr, scsi_device_type(csd->devtype), hostno, + csd->bus, csd->target, csd->lun); */ + cciss_scsi_remove_entry(ctlr, hostno, i, + removed, &nremoved); + /* remove ^^^, hence i not incremented */ + } else if (found == 1) { /* device is different in some way */ + changes++; + printk("cciss%d: device c%db%dt%dl%d has changed.\n", + ctlr, hostno, csd->bus, csd->target, csd->lun); + cciss_scsi_remove_entry(ctlr, hostno, i, + removed, &nremoved); + /* remove ^^^, hence i not incremented */ + if (cciss_scsi_add_entry(ctlr, hostno, &sd[j], + added, &nadded) != 0) + /* we just removed one, so add can't fail. */ + BUG(); + csd->devtype = sd[j].devtype; + memcpy(csd->device_id, sd[j].device_id, + sizeof(csd->device_id)); + memcpy(csd->vendor, sd[j].vendor, + sizeof(csd->vendor)); + memcpy(csd->model, sd[j].model, + sizeof(csd->model)); + memcpy(csd->revision, sd[j].revision, + sizeof(csd->revision)); + } else /* device is same as it ever was, */ + i++; /* so just move along. */ + } + + /* Now, make sure every device listed in sd[] is also + listed in ccissscsi[], adding them if they aren't found */ + + for (i=0;i<nsds;i++) { + found=0; + for (j=0;j<ccissscsi[ctlr].ndevices;j++) { + csd = &ccissscsi[ctlr].dev[j]; + if (SCSI3ADDR_EQ(sd[i].scsi3addr, + csd->scsi3addr)) { + if (device_is_the_same(&sd[i], csd)) + found=2; /* found device */ + else + found=1; /* found a bug. */ + break; + } + } + if (!found) { + changes++; + if (cciss_scsi_add_entry(ctlr, hostno, &sd[i], + added, &nadded) != 0) + break; + } else if (found == 1) { + /* should never happen... */ + changes++; + printk(KERN_WARNING "cciss%d: device " + "unexpectedly changed\n", ctlr); + /* but if it does happen, we just ignore that device */ + } + } + CPQ_TAPE_UNLOCK(ctlr, flags); + + /* Don't notify scsi mid layer of any changes the first time through */ + /* (or if there are no changes) scsi_scan_host will do it later the */ + /* first time through. */ + if (hostno == -1 || !changes) + goto free_and_out; + + /* Notify scsi mid layer of any removed devices */ + for (i = 0; i < nremoved; i++) { + struct scsi_device *sdev = + scsi_device_lookup(sh, removed[i].bus, + removed[i].target, removed[i].lun); + if (sdev != NULL) { + scsi_remove_device(sdev); + scsi_device_put(sdev); + } else { + /* We don't expect to get here. */ + /* future cmds to this device will get selection */ + /* timeout as if the device was gone. */ + printk(KERN_WARNING "cciss%d: didn't find " + "c%db%dt%dl%d\n for removal.", + ctlr, hostno, removed[i].bus, + removed[i].target, removed[i].lun); + } + } + + /* Notify scsi mid layer of any added devices */ + for (i = 0; i < nadded; i++) { + int rc; + rc = scsi_add_device(sh, added[i].bus, + added[i].target, added[i].lun); + if (rc == 0) + continue; + printk(KERN_WARNING "cciss%d: scsi_add_device " + "c%db%dt%dl%d failed, device not added.\n", + ctlr, hostno, + added[i].bus, added[i].target, added[i].lun); + /* now we have to remove it from ccissscsi, */ + /* since it didn't get added to scsi mid layer */ + fixup_botched_add(ctlr, added[i].scsi3addr); + } + +free_and_out: + kfree(added); + kfree(removed); + return 0; +} + +static int +lookup_scsi3addr(int ctlr, int bus, int target, int lun, char *scsi3addr) +{ + int i; + struct cciss_scsi_dev_t *sd; + unsigned long flags; + + CPQ_TAPE_LOCK(ctlr, flags); + for (i=0;i<ccissscsi[ctlr].ndevices;i++) { + sd = &ccissscsi[ctlr].dev[i]; + if (sd->bus == bus && + sd->target == target && + sd->lun == lun) { + memcpy(scsi3addr, &sd->scsi3addr[0], 8); + CPQ_TAPE_UNLOCK(ctlr, flags); + return 0; + } + } + CPQ_TAPE_UNLOCK(ctlr, flags); + return -1; +} + +static void +cciss_scsi_setup(int cntl_num) +{ + struct cciss_scsi_adapter_data_t * shba; + + ccissscsi[cntl_num].ndevices = 0; + shba = (struct cciss_scsi_adapter_data_t *) + kmalloc(sizeof(*shba), GFP_KERNEL); + if (shba == NULL) + return; + shba->scsi_host = NULL; + spin_lock_init(&shba->lock); + shba->registered = 0; + if (scsi_cmd_stack_setup(cntl_num, shba) != 0) { + kfree(shba); + shba = NULL; + } + hba[cntl_num]->scsi_ctlr = (void *) shba; + return; +} + +static void +complete_scsi_command( CommandList_struct *cp, int timeout, __u32 tag) +{ + struct scsi_cmnd *cmd; + ctlr_info_t *ctlr; + ErrorInfo_struct *ei; + + ei = cp->err_info; + + /* First, see if it was a message rather than a command */ + if (cp->Request.Type.Type == TYPE_MSG) { + cp->cmd_type = CMD_MSG_DONE; + return; + } + + cmd = (struct scsi_cmnd *) cp->scsi_cmd; + ctlr = hba[cp->ctlr]; + + scsi_dma_unmap(cmd); + + cmd->result = (DID_OK << 16); /* host byte */ + cmd->result |= (COMMAND_COMPLETE << 8); /* msg byte */ + /* cmd->result |= (GOOD < 1); */ /* status byte */ + + cmd->result |= (ei->ScsiStatus); + /* printk("Scsistatus is 0x%02x\n", ei->ScsiStatus); */ + + /* copy the sense data whether we need to or not. */ + + memcpy(cmd->sense_buffer, ei->SenseInfo, + ei->SenseLen > SCSI_SENSE_BUFFERSIZE ? + SCSI_SENSE_BUFFERSIZE : + ei->SenseLen); + scsi_set_resid(cmd, ei->ResidualCnt); + + if(ei->CommandStatus != 0) + { /* an error has occurred */ + switch(ei->CommandStatus) + { + case CMD_TARGET_STATUS: + /* Pass it up to the upper layers... */ + if( ei->ScsiStatus) + { +#if 0 + printk(KERN_WARNING "cciss: cmd %p " + "has SCSI Status = %x\n", + cp, + ei->ScsiStatus); +#endif + cmd->result |= (ei->ScsiStatus < 1); + } + else { /* scsi status is zero??? How??? */ + + /* Ordinarily, this case should never happen, but there is a bug + in some released firmware revisions that allows it to happen + if, for example, a 4100 backplane loses power and the tape + drive is in it. We assume that it's a fatal error of some + kind because we can't show that it wasn't. We will make it + look like selection timeout since that is the most common + reason for this to occur, and it's severe enough. */ + + cmd->result = DID_NO_CONNECT << 16; + } + break; + case CMD_DATA_UNDERRUN: /* let mid layer handle it. */ + break; + case CMD_DATA_OVERRUN: + printk(KERN_WARNING "cciss: cp %p has" + " completed with data overrun " + "reported\n", cp); + break; + case CMD_INVALID: { + /* print_bytes(cp, sizeof(*cp), 1, 0); + print_cmd(cp); */ + /* We get CMD_INVALID if you address a non-existent tape drive instead + of a selection timeout (no response). You will see this if you yank + out a tape drive, then try to access it. This is kind of a shame + because it means that any other CMD_INVALID (e.g. driver bug) will + get interpreted as a missing target. */ + cmd->result = DID_NO_CONNECT << 16; + } + break; + case CMD_PROTOCOL_ERR: + printk(KERN_WARNING "cciss: cp %p has " + "protocol error \n", cp); + break; + case CMD_HARDWARE_ERR: + cmd->result = DID_ERROR << 16; + printk(KERN_WARNING "cciss: cp %p had " + " hardware error\n", cp); + break; + case CMD_CONNECTION_LOST: + cmd->result = DID_ERROR << 16; + printk(KERN_WARNING "cciss: cp %p had " + "connection lost\n", cp); + break; + case CMD_ABORTED: + cmd->result = DID_ABORT << 16; + printk(KERN_WARNING "cciss: cp %p was " + "aborted\n", cp); + break; + case CMD_ABORT_FAILED: + cmd->result = DID_ERROR << 16; + printk(KERN_WARNING "cciss: cp %p reports " + "abort failed\n", cp); + break; + case CMD_UNSOLICITED_ABORT: + cmd->result = DID_ABORT << 16; + printk(KERN_WARNING "cciss: cp %p aborted " + "do to an unsolicited abort\n", cp); + break; + case CMD_TIMEOUT: + cmd->result = DID_TIME_OUT << 16; + printk(KERN_WARNING "cciss: cp %p timedout\n", + cp); + break; + default: + cmd->result = DID_ERROR << 16; + printk(KERN_WARNING "cciss: cp %p returned " + "unknown status %x\n", cp, + ei->CommandStatus); + } + } + // printk("c:%p:c%db%dt%dl%d ", cmd, ctlr->ctlr, cmd->channel, + // cmd->target, cmd->lun); + cmd->scsi_done(cmd); + scsi_cmd_free(ctlr, cp); +} + +static int +cciss_scsi_detect(int ctlr) +{ + struct Scsi_Host *sh; + int error; + + sh = scsi_host_alloc(&cciss_driver_template, sizeof(struct ctlr_info *)); + if (sh == NULL) + goto fail; + sh->io_port = 0; // good enough? FIXME, + sh->n_io_port = 0; // I don't think we use these two... + sh->this_id = SELF_SCSI_ID; + + ((struct cciss_scsi_adapter_data_t *) + hba[ctlr]->scsi_ctlr)->scsi_host = (void *) sh; + sh->hostdata[0] = (unsigned long) hba[ctlr]; + sh->irq = hba[ctlr]->intr[SIMPLE_MODE_INT]; + sh->unique_id = sh->irq; + error = scsi_add_host(sh, &hba[ctlr]->pdev->dev); + if (error) + goto fail_host_put; + scsi_scan_host(sh); + return 1; + + fail_host_put: + scsi_host_put(sh); + fail: + return 0; +} + +static void +cciss_unmap_one(struct pci_dev *pdev, + CommandList_struct *cp, + size_t buflen, + int data_direction) +{ + u64bit addr64; + + addr64.val32.lower = cp->SG[0].Addr.lower; + addr64.val32.upper = cp->SG[0].Addr.upper; + pci_unmap_single(pdev, (dma_addr_t) addr64.val, buflen, data_direction); +} + +static void +cciss_map_one(struct pci_dev *pdev, + CommandList_struct *cp, + unsigned char *buf, + size_t buflen, + int data_direction) +{ + __u64 addr64; + + addr64 = (__u64) pci_map_single(pdev, buf, buflen, data_direction); + cp->SG[0].Addr.lower = + (__u32) (addr64 & (__u64) 0x00000000FFFFFFFF); + cp->SG[0].Addr.upper = + (__u32) ((addr64 >> 32) & (__u64) 0x00000000FFFFFFFF); + cp->SG[0].Len = buflen; + cp->Header.SGList = (__u8) 1; /* no. SGs contig in this cmd */ + cp->Header.SGTotal = (__u16) 1; /* total sgs in this cmd list */ +} + +static int +cciss_scsi_do_simple_cmd(ctlr_info_t *c, + CommandList_struct *cp, + unsigned char *scsi3addr, + unsigned char *cdb, + unsigned char cdblen, + unsigned char *buf, int bufsize, + int direction) +{ + unsigned long flags; + DECLARE_COMPLETION_ONSTACK(wait); + + cp->cmd_type = CMD_IOCTL_PEND; // treat this like an ioctl + cp->scsi_cmd = NULL; + cp->Header.ReplyQueue = 0; // unused in simple mode + memcpy(&cp->Header.LUN, scsi3addr, sizeof(cp->Header.LUN)); + cp->Header.Tag.lower = cp->busaddr; // Use k. address of cmd as tag + // Fill in the request block... + + /* printk("Using scsi3addr 0x%02x%0x2%0x2%0x2%0x2%0x2%0x2%0x2\n", + scsi3addr[0], scsi3addr[1], scsi3addr[2], scsi3addr[3], + scsi3addr[4], scsi3addr[5], scsi3addr[6], scsi3addr[7]); */ + + memset(cp->Request.CDB, 0, sizeof(cp->Request.CDB)); + memcpy(cp->Request.CDB, cdb, cdblen); + cp->Request.Timeout = 0; + cp->Request.CDBLen = cdblen; + cp->Request.Type.Type = TYPE_CMD; + cp->Request.Type.Attribute = ATTR_SIMPLE; + cp->Request.Type.Direction = direction; + + /* Fill in the SG list and do dma mapping */ + cciss_map_one(c->pdev, cp, (unsigned char *) buf, + bufsize, DMA_FROM_DEVICE); + + cp->waiting = &wait; + + /* Put the request on the tail of the request queue */ + spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags); + addQ(&c->reqQ, cp); + c->Qdepth++; + start_io(c); + spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags); + + wait_for_completion(&wait); + + /* undo the dma mapping */ + cciss_unmap_one(c->pdev, cp, bufsize, DMA_FROM_DEVICE); + return(0); +} + +static void +cciss_scsi_interpret_error(CommandList_struct *cp) +{ + ErrorInfo_struct *ei; + + ei = cp->err_info; + switch(ei->CommandStatus) + { + case CMD_TARGET_STATUS: + printk(KERN_WARNING "cciss: cmd %p has " + "completed with errors\n", cp); + printk(KERN_WARNING "cciss: cmd %p " + "has SCSI Status = %x\n", + cp, + ei->ScsiStatus); + if (ei->ScsiStatus == 0) + printk(KERN_WARNING + "cciss:SCSI status is abnormally zero. " + "(probably indicates selection timeout " + "reported incorrectly due to a known " + "firmware bug, circa July, 2001.)\n"); + break; + case CMD_DATA_UNDERRUN: /* let mid layer handle it. */ + printk("UNDERRUN\n"); + break; + case CMD_DATA_OVERRUN: + printk(KERN_WARNING "cciss: cp %p has" + " completed with data overrun " + "reported\n", cp); + break; + case CMD_INVALID: { + /* controller unfortunately reports SCSI passthru's */ + /* to non-existent targets as invalid commands. */ + printk(KERN_WARNING "cciss: cp %p is " + "reported invalid (probably means " + "target device no longer present)\n", + cp); + /* print_bytes((unsigned char *) cp, sizeof(*cp), 1, 0); + print_cmd(cp); */ + } + break; + case CMD_PROTOCOL_ERR: + printk(KERN_WARNING "cciss: cp %p has " + "protocol error \n", cp); + break; + case CMD_HARDWARE_ERR: + /* cmd->result = DID_ERROR << 16; */ + printk(KERN_WARNING "cciss: cp %p had " + " hardware error\n", cp); + break; + case CMD_CONNECTION_LOST: + printk(KERN_WARNING "cciss: cp %p had " + "connection lost\n", cp); + break; + case CMD_ABORTED: + printk(KERN_WARNING "cciss: cp %p was " + "aborted\n", cp); + break; + case CMD_ABORT_FAILED: + printk(KERN_WARNING "cciss: cp %p reports " + "abort failed\n", cp); + break; + case CMD_UNSOLICITED_ABORT: + printk(KERN_WARNING "cciss: cp %p aborted " + "do to an unsolicited abort\n", cp); + break; + case CMD_TIMEOUT: + printk(KERN_WARNING "cciss: cp %p timedout\n", + cp); + break; + default: + printk(KERN_WARNING "cciss: cp %p returned " + "unknown status %x\n", cp, + ei->CommandStatus); + } +} + +static int +cciss_scsi_do_inquiry(ctlr_info_t *c, unsigned char *scsi3addr, + unsigned char page, unsigned char *buf, + unsigned char bufsize) +{ + int rc; + CommandList_struct *cp; + char cdb[6]; + ErrorInfo_struct *ei; + unsigned long flags; + + spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags); + cp = scsi_cmd_alloc(c); + spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags); + + if (cp == NULL) { /* trouble... */ + printk("cmd_alloc returned NULL!\n"); + return -1; + } + + ei = cp->err_info; + + cdb[0] = CISS_INQUIRY; + cdb[1] = (page != 0); + cdb[2] = page; + cdb[3] = 0; + cdb[4] = bufsize; + cdb[5] = 0; + rc = cciss_scsi_do_simple_cmd(c, cp, scsi3addr, cdb, + 6, buf, bufsize, XFER_READ); + + if (rc != 0) return rc; /* something went wrong */ + + if (ei->CommandStatus != 0 && + ei->CommandStatus != CMD_DATA_UNDERRUN) { + cciss_scsi_interpret_error(cp); + rc = -1; + } + spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags); + scsi_cmd_free(c, cp); + spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags); + return rc; +} + +/* Get the device id from inquiry page 0x83 */ +static int cciss_scsi_get_device_id(ctlr_info_t *c, unsigned char *scsi3addr, + unsigned char *device_id, int buflen) +{ + int rc; + unsigned char *buf; + + if (buflen > 16) + buflen = 16; + buf = kzalloc(64, GFP_KERNEL); + if (!buf) + return -1; + rc = cciss_scsi_do_inquiry(c, scsi3addr, 0x83, buf, 64); + if (rc == 0) + memcpy(device_id, &buf[8], buflen); + kfree(buf); + return rc != 0; +} + +static int +cciss_scsi_do_report_phys_luns(ctlr_info_t *c, + ReportLunData_struct *buf, int bufsize) +{ + int rc; + CommandList_struct *cp; + unsigned char cdb[12]; + unsigned char scsi3addr[8]; + ErrorInfo_struct *ei; + unsigned long flags; + + spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags); + cp = scsi_cmd_alloc(c); + spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags); + if (cp == NULL) { /* trouble... */ + printk("cmd_alloc returned NULL!\n"); + return -1; + } + + memset(&scsi3addr[0], 0, 8); /* address the controller */ + cdb[0] = CISS_REPORT_PHYS; + cdb[1] = 0; + cdb[2] = 0; + cdb[3] = 0; + cdb[4] = 0; + cdb[5] = 0; + cdb[6] = (bufsize >> 24) & 0xFF; //MSB + cdb[7] = (bufsize >> 16) & 0xFF; + cdb[8] = (bufsize >> 8) & 0xFF; + cdb[9] = bufsize & 0xFF; + cdb[10] = 0; + cdb[11] = 0; + + rc = cciss_scsi_do_simple_cmd(c, cp, scsi3addr, + cdb, 12, + (unsigned char *) buf, + bufsize, XFER_READ); + + if (rc != 0) return rc; /* something went wrong */ + + ei = cp->err_info; + if (ei->CommandStatus != 0 && + ei->CommandStatus != CMD_DATA_UNDERRUN) { + cciss_scsi_interpret_error(cp); + rc = -1; + } + spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags); + scsi_cmd_free(c, cp); + spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags); + return rc; +} + +static void +cciss_update_non_disk_devices(int cntl_num, int hostno) +{ + /* the idea here is we could get notified from /proc + that some devices have changed, so we do a report + physical luns cmd, and adjust our list of devices + accordingly. (We can't rely on the scsi-mid layer just + doing inquiries, because the "busses" that the scsi + mid-layer probes are totally fabricated by this driver, + so new devices wouldn't show up. + + the scsi3addr's of devices won't change so long as the + adapter is not reset. That means we can rescan and + tell which devices we already know about, vs. new + devices, vs. disappearing devices. + + Also, if you yank out a tape drive, then put in a disk + in it's place, (say, a configured volume from another + array controller for instance) _don't_ poke this driver + (so it thinks it's still a tape, but _do_ poke the scsi + mid layer, so it does an inquiry... the scsi mid layer + will see the physical disk. This would be bad. Need to + think about how to prevent that. One idea would be to + snoop all scsi responses and if an inquiry repsonse comes + back that reports a disk, chuck it an return selection + timeout instead and adjust our table... Not sure i like + that though. + + */ +#define OBDR_TAPE_INQ_SIZE 49 +#define OBDR_TAPE_SIG "$DR-10" + ReportLunData_struct *ld_buff; + unsigned char *inq_buff; + unsigned char scsi3addr[8]; + ctlr_info_t *c; + __u32 num_luns=0; + unsigned char *ch; + struct cciss_scsi_dev_t *currentsd, *this_device; + int ncurrent=0; + int reportlunsize = sizeof(*ld_buff) + CISS_MAX_PHYS_LUN * 8; + int i; + + c = (ctlr_info_t *) hba[cntl_num]; + ld_buff = kzalloc(reportlunsize, GFP_KERNEL); + inq_buff = kmalloc(OBDR_TAPE_INQ_SIZE, GFP_KERNEL); + currentsd = kzalloc(sizeof(*currentsd) * + (CCISS_MAX_SCSI_DEVS_PER_HBA+1), GFP_KERNEL); + if (ld_buff == NULL || inq_buff == NULL || currentsd == NULL) { + printk(KERN_ERR "cciss: out of memory\n"); + goto out; + } + this_device = ¤tsd[CCISS_MAX_SCSI_DEVS_PER_HBA]; + if (cciss_scsi_do_report_phys_luns(c, ld_buff, reportlunsize) == 0) { + ch = &ld_buff->LUNListLength[0]; + num_luns = ((ch[0]<<24) | (ch[1]<<16) | (ch[2]<<8) | ch[3]) / 8; + if (num_luns > CISS_MAX_PHYS_LUN) { + printk(KERN_WARNING + "cciss: Maximum physical LUNs (%d) exceeded. " + "%d LUNs ignored.\n", CISS_MAX_PHYS_LUN, + num_luns - CISS_MAX_PHYS_LUN); + num_luns = CISS_MAX_PHYS_LUN; + } + } + else { + printk(KERN_ERR "cciss: Report physical LUNs failed.\n"); + goto out; + } + + + /* adjust our table of devices */ + for (i = 0; i < num_luns; i++) { + /* for each physical lun, do an inquiry */ + if (ld_buff->LUN[i][3] & 0xC0) continue; + memset(inq_buff, 0, OBDR_TAPE_INQ_SIZE); + memcpy(&scsi3addr[0], &ld_buff->LUN[i][0], 8); + + if (cciss_scsi_do_inquiry(hba[cntl_num], scsi3addr, 0, inq_buff, + (unsigned char) OBDR_TAPE_INQ_SIZE) != 0) + /* Inquiry failed (msg printed already) */ + continue; /* so we will skip this device. */ + + this_device->devtype = (inq_buff[0] & 0x1f); + this_device->bus = -1; + this_device->target = -1; + this_device->lun = -1; + memcpy(this_device->scsi3addr, scsi3addr, 8); + memcpy(this_device->vendor, &inq_buff[8], + sizeof(this_device->vendor)); + memcpy(this_device->model, &inq_buff[16], + sizeof(this_device->model)); + memcpy(this_device->revision, &inq_buff[32], + sizeof(this_device->revision)); + memset(this_device->device_id, 0, + sizeof(this_device->device_id)); + cciss_scsi_get_device_id(hba[cntl_num], scsi3addr, + this_device->device_id, sizeof(this_device->device_id)); + + switch (this_device->devtype) + { + case 0x05: /* CD-ROM */ { + + /* We don't *really* support actual CD-ROM devices, + * just this "One Button Disaster Recovery" tape drive + * which temporarily pretends to be a CD-ROM drive. + * So we check that the device is really an OBDR tape + * device by checking for "$DR-10" in bytes 43-48 of + * the inquiry data. + */ + char obdr_sig[7]; + + strncpy(obdr_sig, &inq_buff[43], 6); + obdr_sig[6] = '\0'; + if (strncmp(obdr_sig, OBDR_TAPE_SIG, 6) != 0) + /* Not OBDR device, ignore it. */ + break; + } + /* fall through . . . */ + case 0x01: /* sequential access, (tape) */ + case 0x08: /* medium changer */ + if (ncurrent >= CCISS_MAX_SCSI_DEVS_PER_HBA) { + printk(KERN_INFO "cciss%d: %s ignored, " + "too many devices.\n", cntl_num, + scsi_device_type(this_device->devtype)); + break; + } + currentsd[ncurrent] = *this_device; + ncurrent++; + break; + default: + break; + } + } + + adjust_cciss_scsi_table(cntl_num, hostno, currentsd, ncurrent); +out: + kfree(inq_buff); + kfree(ld_buff); + kfree(currentsd); + return; +} + +static int +is_keyword(char *ptr, int len, char *verb) // Thanks to ncr53c8xx.c +{ + int verb_len = strlen(verb); + if (len >= verb_len && !memcmp(verb,ptr,verb_len)) + return verb_len; + else + return 0; +} + +static int +cciss_scsi_user_command(int ctlr, int hostno, char *buffer, int length) +{ + int arg_len; + + if ((arg_len = is_keyword(buffer, length, "rescan")) != 0) + cciss_update_non_disk_devices(ctlr, hostno); + else + return -EINVAL; + return length; +} + + +static int +cciss_scsi_proc_info(struct Scsi_Host *sh, + char *buffer, /* data buffer */ + char **start, /* where data in buffer starts */ + off_t offset, /* offset from start of imaginary file */ + int length, /* length of data in buffer */ + int func) /* 0 == read, 1 == write */ +{ + + int buflen, datalen; + ctlr_info_t *ci; + int i; + int cntl_num; + + + ci = (ctlr_info_t *) sh->hostdata[0]; + if (ci == NULL) /* This really shouldn't ever happen. */ + return -EINVAL; + + cntl_num = ci->ctlr; /* Get our index into the hba[] array */ + + if (func == 0) { /* User is reading from /proc/scsi/ciss*?/?* */ + buflen = sprintf(buffer, "cciss%d: SCSI host: %d\n", + cntl_num, sh->host_no); + + /* this information is needed by apps to know which cciss + device corresponds to which scsi host number without + having to open a scsi target device node. The device + information is not a duplicate of /proc/scsi/scsi because + the two may be out of sync due to scsi hotplug, rather + this info is for an app to be able to use to know how to + get them back in sync. */ + + for (i=0;i<ccissscsi[cntl_num].ndevices;i++) { + struct cciss_scsi_dev_t *sd = &ccissscsi[cntl_num].dev[i]; + buflen += sprintf(&buffer[buflen], "c%db%dt%dl%d %02d " + "0x%02x%02x%02x%02x%02x%02x%02x%02x\n", + sh->host_no, sd->bus, sd->target, sd->lun, + sd->devtype, + sd->scsi3addr[0], sd->scsi3addr[1], + sd->scsi3addr[2], sd->scsi3addr[3], + sd->scsi3addr[4], sd->scsi3addr[5], + sd->scsi3addr[6], sd->scsi3addr[7]); + } + datalen = buflen - offset; + if (datalen < 0) { /* they're reading past EOF. */ + datalen = 0; + *start = buffer+buflen; + } else + *start = buffer + offset; + return(datalen); + } else /* User is writing to /proc/scsi/cciss*?/?* ... */ + return cciss_scsi_user_command(cntl_num, sh->host_no, + buffer, length); +} + +/* cciss_scatter_gather takes a struct scsi_cmnd, (cmd), and does the pci + dma mapping and fills in the scatter gather entries of the + cciss command, cp. */ + +static void +cciss_scatter_gather(struct pci_dev *pdev, + CommandList_struct *cp, + struct scsi_cmnd *cmd) +{ + unsigned int len; + struct scatterlist *sg; + __u64 addr64; + int use_sg, i; + + BUG_ON(scsi_sg_count(cmd) > MAXSGENTRIES); + + use_sg = scsi_dma_map(cmd); + if (use_sg) { /* not too many addrs? */ + scsi_for_each_sg(cmd, sg, use_sg, i) { + addr64 = (__u64) sg_dma_address(sg); + len = sg_dma_len(sg); + cp->SG[i].Addr.lower = + (__u32) (addr64 & (__u64) 0x00000000FFFFFFFF); + cp->SG[i].Addr.upper = + (__u32) ((addr64 >> 32) & (__u64) 0x00000000FFFFFFFF); + cp->SG[i].Len = len; + cp->SG[i].Ext = 0; // we are not chaining + } + } + + cp->Header.SGList = (__u8) use_sg; /* no. SGs contig in this cmd */ + cp->Header.SGTotal = (__u16) use_sg; /* total sgs in this cmd list */ + return; +} + + +static int +cciss_scsi_queue_command (struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd *)) +{ + ctlr_info_t **c; + int ctlr, rc; + unsigned char scsi3addr[8]; + CommandList_struct *cp; + unsigned long flags; + + // Get the ptr to our adapter structure (hba[i]) out of cmd->host. + // We violate cmd->host privacy here. (Is there another way?) + c = (ctlr_info_t **) &cmd->device->host->hostdata[0]; + ctlr = (*c)->ctlr; + + rc = lookup_scsi3addr(ctlr, cmd->device->channel, cmd->device->id, + cmd->device->lun, scsi3addr); + if (rc != 0) { + /* the scsi nexus does not match any that we presented... */ + /* pretend to mid layer that we got selection timeout */ + cmd->result = DID_NO_CONNECT << 16; + done(cmd); + /* we might want to think about registering controller itself + as a processor device on the bus so sg binds to it. */ + return 0; + } + + /* printk("cciss_queue_command, p=%p, cmd=0x%02x, c%db%dt%dl%d\n", + cmd, cmd->cmnd[0], ctlr, cmd->channel, cmd->target, cmd->lun);*/ + // printk("q:%p:c%db%dt%dl%d ", cmd, ctlr, cmd->channel, + // cmd->target, cmd->lun); + + /* Ok, we have a reasonable scsi nexus, so send the cmd down, and + see what the device thinks of it. */ + + spin_lock_irqsave(CCISS_LOCK(ctlr), flags); + cp = scsi_cmd_alloc(*c); + spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags); + if (cp == NULL) { /* trouble... */ + printk("scsi_cmd_alloc returned NULL!\n"); + /* FIXME: next 3 lines are -> BAD! <- */ + cmd->result = DID_NO_CONNECT << 16; + done(cmd); + return 0; + } + + // Fill in the command list header + + cmd->scsi_done = done; // save this for use by completion code + + // save cp in case we have to abort it + cmd->host_scribble = (unsigned char *) cp; + + cp->cmd_type = CMD_SCSI; + cp->scsi_cmd = cmd; + cp->Header.ReplyQueue = 0; // unused in simple mode + memcpy(&cp->Header.LUN.LunAddrBytes[0], &scsi3addr[0], 8); + cp->Header.Tag.lower = cp->busaddr; // Use k. address of cmd as tag + + // Fill in the request block... + + cp->Request.Timeout = 0; + memset(cp->Request.CDB, 0, sizeof(cp->Request.CDB)); + BUG_ON(cmd->cmd_len > sizeof(cp->Request.CDB)); + cp->Request.CDBLen = cmd->cmd_len; + memcpy(cp->Request.CDB, cmd->cmnd, cmd->cmd_len); + cp->Request.Type.Type = TYPE_CMD; + cp->Request.Type.Attribute = ATTR_SIMPLE; + switch(cmd->sc_data_direction) + { + case DMA_TO_DEVICE: cp->Request.Type.Direction = XFER_WRITE; break; + case DMA_FROM_DEVICE: cp->Request.Type.Direction = XFER_READ; break; + case DMA_NONE: cp->Request.Type.Direction = XFER_NONE; break; + case DMA_BIDIRECTIONAL: + // This can happen if a buggy application does a scsi passthru + // and sets both inlen and outlen to non-zero. ( see + // ../scsi/scsi_ioctl.c:scsi_ioctl_send_command() ) + + cp->Request.Type.Direction = XFER_RSVD; + // This is technically wrong, and cciss controllers should + // reject it with CMD_INVALID, which is the most correct + // response, but non-fibre backends appear to let it + // slide by, and give the same results as if this field + // were set correctly. Either way is acceptable for + // our purposes here. + + break; + + default: + printk("cciss: unknown data direction: %d\n", + cmd->sc_data_direction); + BUG(); + break; + } + + cciss_scatter_gather((*c)->pdev, cp, cmd); // Fill the SG list + + /* Put the request on the tail of the request queue */ + + spin_lock_irqsave(CCISS_LOCK(ctlr), flags); + addQ(&(*c)->reqQ, cp); + (*c)->Qdepth++; + start_io(*c); + spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags); + + /* the cmd'll come back via intr handler in complete_scsi_command() */ + return 0; +} + +static void +cciss_unregister_scsi(int ctlr) +{ + struct cciss_scsi_adapter_data_t *sa; + struct cciss_scsi_cmd_stack_t *stk; + unsigned long flags; + + /* we are being forcibly unloaded, and may not refuse. */ + + spin_lock_irqsave(CCISS_LOCK(ctlr), flags); + sa = (struct cciss_scsi_adapter_data_t *) hba[ctlr]->scsi_ctlr; + stk = &sa->cmd_stack; + + /* if we weren't ever actually registered, don't unregister */ + if (sa->registered) { + spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags); + scsi_remove_host(sa->scsi_host); + scsi_host_put(sa->scsi_host); + spin_lock_irqsave(CCISS_LOCK(ctlr), flags); + } + + /* set scsi_host to NULL so our detect routine will + find us on register */ + sa->scsi_host = NULL; + spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags); + scsi_cmd_stack_free(ctlr); + kfree(sa); +} + +static int +cciss_engage_scsi(int ctlr) +{ + struct cciss_scsi_adapter_data_t *sa; + struct cciss_scsi_cmd_stack_t *stk; + unsigned long flags; + + spin_lock_irqsave(CCISS_LOCK(ctlr), flags); + sa = (struct cciss_scsi_adapter_data_t *) hba[ctlr]->scsi_ctlr; + stk = &sa->cmd_stack; + + if (sa->registered) { + printk("cciss%d: SCSI subsystem already engaged.\n", ctlr); + spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags); + return ENXIO; + } + sa->registered = 1; + spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags); + cciss_update_non_disk_devices(ctlr, -1); + cciss_scsi_detect(ctlr); + return 0; +} + +static void +cciss_seq_tape_report(struct seq_file *seq, int ctlr) +{ + unsigned long flags; + + CPQ_TAPE_LOCK(ctlr, flags); + seq_printf(seq, + "Sequential access devices: %d\n\n", + ccissscsi[ctlr].ndevices); + CPQ_TAPE_UNLOCK(ctlr, flags); +} + + +/* Need at least one of these error handlers to keep ../scsi/hosts.c from + * complaining. Doing a host- or bus-reset can't do anything good here. + * Despite what it might say in scsi_error.c, there may well be commands + * on the controller, as the cciss driver registers twice, once as a block + * device for the logical drives, and once as a scsi device, for any tape + * drives. So we know there are no commands out on the tape drives, but we + * don't know there are no commands on the controller, and it is likely + * that there probably are, as the cciss block device is most commonly used + * as a boot device (embedded controller on HP/Compaq systems.) +*/ + +static int cciss_eh_device_reset_handler(struct scsi_cmnd *scsicmd) +{ + int rc; + CommandList_struct *cmd_in_trouble; + ctlr_info_t **c; + int ctlr; + + /* find the controller to which the command to be aborted was sent */ + c = (ctlr_info_t **) &scsicmd->device->host->hostdata[0]; + if (c == NULL) /* paranoia */ + return FAILED; + ctlr = (*c)->ctlr; + printk(KERN_WARNING "cciss%d: resetting tape drive or medium changer.\n", ctlr); + + /* find the command that's giving us trouble */ + cmd_in_trouble = (CommandList_struct *) scsicmd->host_scribble; + if (cmd_in_trouble == NULL) { /* paranoia */ + return FAILED; + } + /* send a reset to the SCSI LUN which the command was sent to */ + rc = sendcmd(CCISS_RESET_MSG, ctlr, NULL, 0, 2, 0, 0, + (unsigned char *) &cmd_in_trouble->Header.LUN.LunAddrBytes[0], + TYPE_MSG); + /* sendcmd turned off interrupts on the board, turn 'em back on. */ + (*c)->access.set_intr_mask(*c, CCISS_INTR_ON); + if (rc == 0) + return SUCCESS; + printk(KERN_WARNING "cciss%d: resetting device failed.\n", ctlr); + return FAILED; +} + +static int cciss_eh_abort_handler(struct scsi_cmnd *scsicmd) +{ + int rc; + CommandList_struct *cmd_to_abort; + ctlr_info_t **c; + int ctlr; + + /* find the controller to which the command to be aborted was sent */ + c = (ctlr_info_t **) &scsicmd->device->host->hostdata[0]; + if (c == NULL) /* paranoia */ + return FAILED; + ctlr = (*c)->ctlr; + printk(KERN_WARNING "cciss%d: aborting tardy SCSI cmd\n", ctlr); + + /* find the command to be aborted */ + cmd_to_abort = (CommandList_struct *) scsicmd->host_scribble; + if (cmd_to_abort == NULL) /* paranoia */ + return FAILED; + rc = sendcmd(CCISS_ABORT_MSG, ctlr, &cmd_to_abort->Header.Tag, + 0, 2, 0, 0, + (unsigned char *) &cmd_to_abort->Header.LUN.LunAddrBytes[0], + TYPE_MSG); + /* sendcmd turned off interrupts on the board, turn 'em back on. */ + (*c)->access.set_intr_mask(*c, CCISS_INTR_ON); + if (rc == 0) + return SUCCESS; + return FAILED; + +} + +#else /* no CONFIG_CISS_SCSI_TAPE */ + +/* If no tape support, then these become defined out of existence */ + +#define cciss_scsi_setup(cntl_num) + +#endif /* CONFIG_CISS_SCSI_TAPE */ |
