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-rw-r--r--drivers/block/cciss_scsi.c1417
1 files changed, 1417 insertions, 0 deletions
diff --git a/drivers/block/cciss_scsi.c b/drivers/block/cciss_scsi.c
new file mode 100644
index 000000000000..f16e3caed58a
--- /dev/null
+++ b/drivers/block/cciss_scsi.c
@@ -0,0 +1,1417 @@
+/*
+ * Disk Array driver for Compaq SA53xx Controllers, SCSI Tape module
+ * Copyright 2001 Compaq Computer 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, GOOD TITLE or
+ * NON INFRINGEMENT. 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., 675 Mass Ave, Cambridge, MA 02139, 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 <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+#include <asm/atomic.h>
+#include <linux/timer.h>
+#include <linux/completion.h>
+
+#include "cciss_scsi.h"
+
+/* 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 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,
+};
+
+#pragma pack(1)
+struct cciss_scsi_cmd_stack_elem_t {
+ CommandList_struct cmd;
+ ErrorInfo_struct Err;
+ __u32 busaddr;
+};
+
+#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;
+}
+
+/* scsi_device_types comes from scsi.h */
+#define DEVICETYPE(n) (n<0 || n>MAX_SCSI_DEVICE_CODE) ? \
+ "Unknown" : scsi_device_types[n]
+
+#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);
+}
+
+static int
+cciss_scsi_add_entry(int ctlr, int hostno,
+ unsigned char *scsi3addr, int devtype)
+{
+ /* assumes hba[ctlr]->scsi_ctlr->lock is held */
+ int n = ccissscsi[ctlr].ndevices;
+ struct cciss_scsi_dev_t *sd;
+
+ if (n >= CCISS_MAX_SCSI_DEVS_PER_HBA) {
+ printk("cciss%d: Too many devices, "
+ "some will be inaccessible.\n", ctlr);
+ return -1;
+ }
+ sd = &ccissscsi[ctlr].dev[n];
+ if (find_bus_target_lun(ctlr, &sd->bus, &sd->target, &sd->lun) != 0)
+ return -1;
+ memcpy(&sd->scsi3addr[0], scsi3addr, 8);
+ sd->devtype = 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, DEVICETYPE(sd->devtype), hostno,
+ sd->bus, sd->target, sd->lun);
+ return 0;
+}
+
+static void
+cciss_scsi_remove_entry(int ctlr, int hostno, int entry)
+{
+ /* 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];
+ 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, DEVICETYPE(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 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;
+
+ CPQ_TAPE_LOCK(ctlr, flags);
+
+ /* find any devices in ccissscsi[] that are not in
+ sd[] and remove them from ccissscsi[] */
+
+ i = 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 (sd[j].devtype == csd->devtype)
+ 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, DEVICETYPE(csd->devtype), hostno,
+ csd->bus, csd->target, csd->lun); */
+ cciss_scsi_remove_entry(ctlr, hostno, i);
+ /* note, i not incremented */
+ }
+ else if (found == 1) { /* device is different kind */
+ changes++;
+ printk("cciss%d: device c%db%dt%dl%d type changed "
+ "(device type now %s).\n",
+ ctlr, hostno, csd->bus, csd->target, csd->lun,
+ DEVICETYPE(csd->devtype));
+ csd->devtype = sd[j].devtype;
+ i++; /* so just move along. */
+ } 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 (sd[i].devtype == csd->devtype)
+ found=2; /* found device */
+ else
+ found=1; /* found a bug. */
+ break;
+ }
+ }
+ if (!found) {
+ changes++;
+ if (cciss_scsi_add_entry(ctlr, hostno,
+ &sd[i].scsi3addr[0], sd[i].devtype) != 0)
+ break;
+ } else if (found == 1) {
+ /* should never happen... */
+ changes++;
+ printk("cciss%d: device unexpectedly changed type\n",
+ ctlr);
+ /* but if it does happen, we just ignore that device */
+ }
+ }
+ CPQ_TAPE_UNLOCK(ctlr, flags);
+
+ if (!changes)
+ printk("cciss%d: No device changes detected.\n", ctlr);
+
+ 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;
+ u64bit addr64;
+ 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];
+
+ /* undo the DMA mappings */
+
+ if (cmd->use_sg) {
+ pci_unmap_sg(ctlr->pdev,
+ cmd->buffer, cmd->use_sg,
+ cmd->sc_data_direction);
+ }
+ else if (cmd->request_bufflen) {
+ addr64.val32.lower = cp->SG[0].Addr.lower;
+ addr64.val32.upper = cp->SG[0].Addr.upper;
+ pci_unmap_single(ctlr->pdev, (dma_addr_t) addr64.val,
+ cmd->request_bufflen,
+ cmd->sc_data_direction);
+ }
+
+ 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);
+ cmd->resid = 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;
+ 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(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,
+ InquiryData_struct *buf)
+{
+ 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] = 0;
+ cdb[2] = 0;
+ cdb[3] = 0;
+ cdb[4] = sizeof(*buf) & 0xff;
+ cdb[5] = 0;
+ rc = cciss_scsi_do_simple_cmd(c, cp, scsi3addr, cdb,
+ 6, (unsigned char *) buf,
+ sizeof(*buf), 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;
+}
+
+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.
+
+ */
+
+ ReportLunData_struct *ld_buff;
+ InquiryData_struct *inq_buff;
+ unsigned char scsi3addr[8];
+ ctlr_info_t *c;
+ __u32 num_luns=0;
+ unsigned char *ch;
+ /* unsigned char found[CCISS_MAX_SCSI_DEVS_PER_HBA]; */
+ struct cciss_scsi_dev_t currentsd[CCISS_MAX_SCSI_DEVS_PER_HBA];
+ int ncurrent=0;
+ int reportlunsize = sizeof(*ld_buff) + CISS_MAX_PHYS_LUN * 8;
+ int i;
+
+ c = (ctlr_info_t *) hba[cntl_num];
+ ld_buff = kmalloc(reportlunsize, GFP_KERNEL);
+ if (ld_buff == NULL) {
+ printk(KERN_ERR "cciss: out of memory\n");
+ return;
+ }
+ memset(ld_buff, 0, reportlunsize);
+ inq_buff = kmalloc(sizeof( InquiryData_struct), GFP_KERNEL);
+ if (inq_buff == NULL) {
+ printk(KERN_ERR "cciss: out of memory\n");
+ kfree(ld_buff);
+ return;
+ }
+
+ 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++)
+ {
+ int devtype;
+
+ /* for each physical lun, do an inquiry */
+ if (ld_buff->LUN[i][3] & 0xC0) continue;
+ memset(inq_buff, 0, sizeof(InquiryData_struct));
+ memcpy(&scsi3addr[0], &ld_buff->LUN[i][0], 8);
+
+ if (cciss_scsi_do_inquiry(hba[cntl_num],
+ scsi3addr, inq_buff) != 0)
+ {
+ /* Inquiry failed (msg printed already) */
+ devtype = 0; /* so we will skip this device. */
+ } else /* what kind of device is this? */
+ devtype = (inq_buff->data_byte[0] & 0x1f);
+
+ switch (devtype)
+ {
+ 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,
+ DEVICETYPE(devtype));
+ break;
+ }
+ memcpy(&currentsd[ncurrent].scsi3addr[0],
+ &scsi3addr[0], 8);
+ currentsd[ncurrent].devtype = devtype;
+ currentsd[ncurrent].bus = -1;
+ currentsd[ncurrent].target = -1;
+ currentsd[ncurrent].lun = -1;
+ ncurrent++;
+ break;
+ default:
+ break;
+ }
+ }
+
+ adjust_cciss_scsi_table(cntl_num, hostno, currentsd, ncurrent);
+out:
+ kfree(inq_buff);
+ kfree(ld_buff);
+ 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 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, "hostnum=%d\n", sh->host_no);
+
+ 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 use_sg, nsegs=0, len;
+ struct scatterlist *scatter = (struct scatterlist *) cmd->buffer;
+ __u64 addr64;
+
+ /* is it just one virtual address? */
+ if (!cmd->use_sg) {
+ if (cmd->request_bufflen) { /* anything to xfer? */
+
+ addr64 = (__u64) pci_map_single(pdev,
+ cmd->request_buffer,
+ cmd->request_bufflen,
+ cmd->sc_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 = cmd->request_bufflen;
+ nsegs=1;
+ }
+ } /* else, must be a list of virtual addresses.... */
+ else if (cmd->use_sg <= MAXSGENTRIES) { /* not too many addrs? */
+
+ use_sg = pci_map_sg(pdev, cmd->buffer, cmd->use_sg,
+ cmd->sc_data_direction);
+
+ for (nsegs=0; nsegs < use_sg; nsegs++) {
+ addr64 = (__u64) sg_dma_address(&scatter[nsegs]);
+ len = sg_dma_len(&scatter[nsegs]);
+ cp->SG[nsegs].Addr.lower =
+ (__u32) (addr64 & (__u64) 0x00000000FFFFFFFF);
+ cp->SG[nsegs].Addr.upper =
+ (__u32) ((addr64 >> 32) & (__u64) 0x00000000FFFFFFFF);
+ cp->SG[nsegs].Len = len;
+ cp->SG[nsegs].Ext = 0; // we are not chaining
+ }
+ } else BUG();
+
+ cp->Header.SGList = (__u8) nsegs; /* no. SGs contig in this cmd */
+ cp->Header.SGTotal = (__u16) nsegs; /* 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));
+ if (cmd->cmd_len > sizeof(cp->Request.CDB)) BUG();
+ 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;
+ scsi_cmd_stack_free(ctlr);
+ kfree(sa);
+ spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
+}
+
+static int
+cciss_register_scsi(int ctlr)
+{
+ unsigned long flags;
+
+ CPQ_TAPE_LOCK(ctlr, flags);
+
+ /* Since this is really a block driver, the SCSI core may not be
+ initialized at init time, in which case, calling scsi_register_host
+ would hang. Instead, we do it later, via /proc filesystem
+ and rc scripts, when we know SCSI core is good to go. */
+
+ /* Only register if SCSI devices are detected. */
+ if (ccissscsi[ctlr].ndevices != 0) {
+ ((struct cciss_scsi_adapter_data_t *)
+ hba[ctlr]->scsi_ctlr)->registered = 1;
+ CPQ_TAPE_UNLOCK(ctlr, flags);
+ return cciss_scsi_detect(ctlr);
+ }
+ CPQ_TAPE_UNLOCK(ctlr, flags);
+ printk(KERN_INFO
+ "cciss%d: No appropriate SCSI device detected, "
+ "SCSI subsystem not engaged.\n", ctlr);
+ return 0;
+}
+
+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 (((struct cciss_scsi_adapter_data_t *)
+ hba[ctlr]->scsi_ctlr)->registered) {
+ printk("cciss%d: SCSI subsystem already engaged.\n", ctlr);
+ spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
+ return ENXIO;
+ }
+ spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
+ cciss_update_non_disk_devices(ctlr, -1);
+ cciss_register_scsi(ctlr);
+ return 0;
+}
+
+static void
+cciss_proc_tape_report(int ctlr, unsigned char *buffer, off_t *pos, off_t *len)
+{
+ unsigned long flags;
+ int size;
+
+ *pos = *pos -1; *len = *len - 1; // cut off the last trailing newline
+
+ CPQ_TAPE_LOCK(ctlr, flags);
+ size = sprintf(buffer + *len,
+ " Sequential access devices: %d\n\n",
+ ccissscsi[ctlr].ndevices);
+ CPQ_TAPE_UNLOCK(ctlr, flags);
+ *pos += size; *len += size;
+}
+
+#else /* no CONFIG_CISS_SCSI_TAPE */
+
+/* If no tape support, then these become defined out of existence */
+
+#define cciss_scsi_setup(cntl_num)
+#define cciss_unregister_scsi(ctlr)
+#define cciss_register_scsi(ctlr)
+#define cciss_proc_tape_report(ctlr, buffer, pos, len)
+
+#endif /* CONFIG_CISS_SCSI_TAPE */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 01:21:45 +0000