| /* |
| * hosts.c Copyright (C) 1992 Drew Eckhardt |
| * Copyright (C) 1993, 1994, 1995 Eric Youngdale |
| * |
| * mid to lowlevel SCSI driver interface |
| * Initial versions: Drew Eckhardt |
| * Subsequent revisions: Eric Youngdale |
| * |
| * <drew@colorado.edu> |
| * |
| * Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli |
| * Added QLOGIC QLA1280 SCSI controller kernel host support. |
| * August 4, 1999 Fred Lewis, Intel DuPont |
| * |
| * Updated to reflect the new initialization scheme for the higher |
| * level of scsi drivers (sd/sr/st) |
| * September 17, 2000 Torben Mathiasen <tmm@image.dk> |
| */ |
| |
| |
| /* |
| * This file contains the medium level SCSI |
| * host interface initialization, as well as the scsi_hosts array of SCSI |
| * hosts currently present in the system. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/blk.h> |
| #include <linux/kernel.h> |
| #include <linux/string.h> |
| #include <linux/mm.h> |
| #include <linux/proc_fs.h> |
| #include <linux/init.h> |
| |
| #define __KERNEL_SYSCALLS__ |
| |
| #include <linux/unistd.h> |
| |
| #include "scsi.h" |
| #include "hosts.h" |
| |
| /* |
| static const char RCSid[] = "$Header: /vger/u4/cvs/linux/drivers/scsi/hosts.c,v 1.20 1996/12/12 19:18:32 davem Exp $"; |
| */ |
| |
| /* |
| * The scsi host entries should be in the order you wish the |
| * cards to be detected. A driver may appear more than once IFF |
| * it can deal with being detected (and therefore initialized) |
| * with more than one simultaneous host number, can handle being |
| * reentrant, etc. |
| * |
| * They may appear in any order, as each SCSI host is told which host |
| * number it is during detection. |
| */ |
| |
| /* |
| * When figure is run, we don't want to link to any object code. Since |
| * the macro for each host will contain function pointers, we cannot |
| * use it and instead must use a "blank" that does no such |
| * idiocy. |
| */ |
| |
| Scsi_Host_Template * scsi_hosts; |
| |
| |
| /* |
| * Our semaphores and timeout counters, where size depends on |
| * MAX_SCSI_HOSTS here. |
| */ |
| |
| Scsi_Host_Name * scsi_host_no_list; |
| struct Scsi_Host * scsi_hostlist; |
| struct Scsi_Device_Template * scsi_devicelist; |
| |
| int max_scsi_hosts; |
| int next_scsi_host; |
| |
| void |
| scsi_unregister(struct Scsi_Host * sh){ |
| struct Scsi_Host * shpnt; |
| Scsi_Host_Name *shn; |
| |
| if(scsi_hostlist == sh) |
| scsi_hostlist = sh->next; |
| else { |
| shpnt = scsi_hostlist; |
| while(shpnt->next != sh) shpnt = shpnt->next; |
| shpnt->next = shpnt->next->next; |
| } |
| |
| /* |
| * We have to unregister the host from the scsi_host_no_list as well. |
| * Decide by the host_no not by the name because most host drivers are |
| * able to handle more than one adapters from the same kind (or family). |
| */ |
| for ( shn=scsi_host_no_list; shn && (sh->host_no != shn->host_no); |
| shn=shn->next); |
| if (shn) shn->host_registered = 0; |
| /* else {} : This should not happen, we should panic here... */ |
| |
| /* If we are removing the last host registered, it is safe to reuse |
| * its host number (this avoids "holes" at boot time) (DB) |
| * It is also safe to reuse those of numbers directly below which have |
| * been released earlier (to avoid some holes in numbering). |
| */ |
| if(sh->host_no == max_scsi_hosts - 1) { |
| while(--max_scsi_hosts >= next_scsi_host) { |
| shpnt = scsi_hostlist; |
| while(shpnt && shpnt->host_no != max_scsi_hosts - 1) |
| shpnt = shpnt->next; |
| if(shpnt) |
| break; |
| } |
| } |
| next_scsi_host--; |
| kfree((char *) sh); |
| } |
| |
| /* We call this when we come across a new host adapter. We only do this |
| * once we are 100% sure that we want to use this host adapter - it is a |
| * pain to reverse this, so we try to avoid it |
| */ |
| extern int blk_nohighio; |
| struct Scsi_Host * scsi_register(Scsi_Host_Template * tpnt, int j) |
| { |
| struct Scsi_Host * retval, *shpnt, *o_shp; |
| Scsi_Host_Name *shn, *shn2; |
| int flag_new = 1; |
| const char * hname; |
| size_t hname_len; |
| retval = (struct Scsi_Host *)kmalloc(sizeof(struct Scsi_Host) + j, |
| (tpnt->unchecked_isa_dma && j ? |
| GFP_DMA : 0) | GFP_ATOMIC); |
| if(retval == NULL) |
| { |
| printk("scsi: out of memory in scsi_register.\n"); |
| return NULL; |
| } |
| |
| memset(retval, 0, sizeof(struct Scsi_Host) + j); |
| |
| /* trying to find a reserved entry (host_no) */ |
| hname = (tpnt->proc_name) ? tpnt->proc_name : ""; |
| hname_len = strlen(hname); |
| for (shn = scsi_host_no_list;shn;shn = shn->next) { |
| if (!(shn->host_registered) && |
| (hname_len > 0) && (0 == strncmp(hname, shn->name, hname_len))) { |
| flag_new = 0; |
| retval->host_no = shn->host_no; |
| shn->host_registered = 1; |
| break; |
| } |
| } |
| spin_lock_init(&retval->default_lock); |
| scsi_assign_lock(retval, &retval->default_lock); |
| atomic_set(&retval->host_active,0); |
| retval->host_busy = 0; |
| retval->host_failed = 0; |
| if (flag_new) { |
| shn = (Scsi_Host_Name *) kmalloc(sizeof(Scsi_Host_Name), GFP_ATOMIC); |
| if (!shn) { |
| kfree(retval); |
| printk(KERN_ERR "scsi: out of memory(2) in scsi_register.\n"); |
| return NULL; |
| } |
| shn->name = kmalloc(hname_len + 1, GFP_ATOMIC); |
| if (hname_len > 0) |
| strncpy(shn->name, hname, hname_len); |
| shn->name[hname_len] = 0; |
| shn->host_no = max_scsi_hosts++; |
| shn->host_registered = 1; |
| shn->next = NULL; |
| if (scsi_host_no_list) { |
| for (shn2 = scsi_host_no_list;shn2->next;shn2 = shn2->next) |
| ; |
| shn2->next = shn; |
| } |
| else |
| scsi_host_no_list = shn; |
| retval->host_no = shn->host_no; |
| } |
| next_scsi_host++; |
| retval->host_queue = NULL; |
| init_waitqueue_head(&retval->host_wait); |
| retval->resetting = 0; |
| retval->last_reset = 0; |
| retval->irq = 0; |
| retval->dma_channel = 0xff; |
| |
| /* These three are default values which can be overridden */ |
| retval->max_channel = 0; |
| retval->max_id = 8; |
| retval->max_lun = 8; |
| |
| /* |
| * All drivers right now should be able to handle 12 byte commands. |
| * Every so often there are requests for 16 byte commands, but individual |
| * low-level drivers need to certify that they actually do something |
| * sensible with such commands. |
| */ |
| retval->max_cmd_len = 12; |
| |
| retval->unique_id = 0; |
| retval->io_port = 0; |
| retval->hostt = tpnt; |
| retval->next = NULL; |
| retval->in_recovery = 0; |
| retval->ehandler = NULL; /* Initial value until the thing starts up. */ |
| retval->eh_notify = NULL; /* Who we notify when we exit. */ |
| |
| |
| retval->host_blocked = FALSE; |
| retval->host_self_blocked = FALSE; |
| |
| #ifdef DEBUG |
| printk("Register %x %x: %d\n", (int)retval, (int)retval->hostt, j); |
| #endif |
| |
| /* The next six are the default values which can be overridden |
| * if need be */ |
| retval->this_id = tpnt->this_id; |
| retval->can_queue = tpnt->can_queue; |
| retval->sg_tablesize = tpnt->sg_tablesize; |
| retval->cmd_per_lun = tpnt->cmd_per_lun; |
| retval->unchecked_isa_dma = tpnt->unchecked_isa_dma; |
| retval->use_clustering = tpnt->use_clustering; |
| if (!blk_nohighio) |
| retval->highmem_io = tpnt->highmem_io; |
| |
| retval->select_queue_depths = tpnt->select_queue_depths; |
| retval->max_sectors = tpnt->max_sectors; |
| |
| if(!scsi_hostlist) |
| scsi_hostlist = retval; |
| else { |
| shpnt = scsi_hostlist; |
| if (retval->host_no < shpnt->host_no) { |
| retval->next = shpnt; |
| wmb(); /* want all to see these writes in this order */ |
| scsi_hostlist = retval; |
| } |
| else { |
| for (o_shp = shpnt, shpnt = shpnt->next; shpnt; |
| o_shp = shpnt, shpnt = shpnt->next) { |
| if (retval->host_no < shpnt->host_no) { |
| retval->next = shpnt; |
| wmb(); |
| o_shp->next = retval; |
| break; |
| } |
| } |
| if (! shpnt) |
| o_shp->next = retval; |
| } |
| } |
| |
| return retval; |
| } |
| |
| /* |
| * Overrides for Emacs so that we follow Linus's tabbing style. |
| * Emacs will notice this stuff at the end of the file and automatically |
| * adjust the settings for this buffer only. This must remain at the end |
| * of the file. |
| * --------------------------------------------------------------------------- |
| * Local variables: |
| * c-indent-level: 4 |
| * c-brace-imaginary-offset: 0 |
| * c-brace-offset: -4 |
| * c-argdecl-indent: 4 |
| * c-label-offset: -4 |
| * c-continued-statement-offset: 4 |
| * c-continued-brace-offset: 0 |
| * indent-tabs-mode: nil |
| * tab-width: 8 |
| * End: |
| */ |