/* * sr.c Copyright (C) 1992 David Giller * Copyright (C) 1993, 1994, 1995 Eric Youngdale * * adapted from: * sd.c Copyright (C) 1992 Drew Eckhardt * Linux scsi disk driver by * Drew Eckhardt * * Modified by Eric Youngdale ericy@cais.com to * add scatter-gather, multiple outstanding request, and other * enhancements. * * Modified by Eric Youngdale eric@aib.com to support loadable * low-level scsi drivers. * * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to * provide auto-eject. * * Modified by Gerd Knorr to support the * generic cdrom interface * */ #include #include #include #include #include #include #include #include #include #include #include #define MAJOR_NR SCSI_CDROM_MAJOR #include #include "scsi.h" #include "hosts.h" #include "sr.h" #include /* For the door lock/unlock commands */ #include "constants.h" MODULE_PARM(xa_test,"i"); /* see sr_ioctl.c */ #define MAX_RETRIES 3 #define SR_TIMEOUT (30 * HZ) static int sr_init(void); static void sr_finish(void); static int sr_attach(Scsi_Device *); static int sr_detect(Scsi_Device *); static void sr_detach(Scsi_Device *); struct Scsi_Device_Template sr_template = {NULL, "cdrom", "sr", NULL, TYPE_ROM, SCSI_CDROM_MAJOR, 0, 0, 0, 1, sr_detect, sr_init, sr_finish, sr_attach, sr_detach}; Scsi_CD * scsi_CDs = NULL; static int * sr_sizes = NULL; static int * sr_blocksizes = NULL; static int * sr_hardsizes = NULL; /* Hardware sector size */ static int sr_open(struct cdrom_device_info*, int); void get_sectorsize(int); void get_capabilities(int); void requeue_sr_request (Scsi_Cmnd * SCpnt); static int sr_media_change(struct cdrom_device_info*, int); static void sr_release(struct cdrom_device_info *cdi) { if (scsi_CDs[MINOR(cdi->dev)].sector_size > 2048) sr_set_blocklength(MINOR(cdi->dev),2048); sync_dev(cdi->dev); scsi_CDs[MINOR(cdi->dev)].device->access_count--; if (scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module) __MOD_DEC_USE_COUNT(scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module); if(sr_template.module) __MOD_DEC_USE_COUNT(sr_template.module); } static struct cdrom_device_ops sr_dops = { sr_open, /* open */ sr_release, /* release */ sr_drive_status, /* drive status */ sr_media_change, /* media changed */ sr_tray_move, /* tray move */ sr_lock_door, /* lock door */ sr_select_speed, /* select speed */ NULL, /* select disc */ sr_get_last_session, /* get last session */ sr_get_mcn, /* get universal product code */ sr_reset, /* hard reset */ sr_audio_ioctl, /* audio ioctl */ sr_dev_ioctl, /* device-specific ioctl */ CDC_CLOSE_TRAY | CDC_OPEN_TRAY| CDC_LOCK | CDC_SELECT_SPEED | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | CDC_PLAY_AUDIO | CDC_RESET | CDC_IOCTLS | CDC_DRIVE_STATUS, 0 }; /* * This function checks to see if the media has been changed in the * CDROM drive. It is possible that we have already sensed a change, * or the drive may have sensed one and not yet reported it. We must * be ready for either case. This function always reports the current * value of the changed bit. If flag is 0, then the changed bit is reset. * This function could be done as an ioctl, but we would need to have * an inode for that to work, and we do not always have one. */ int sr_media_change(struct cdrom_device_info *cdi, int slot){ int retval; if (CDSL_CURRENT != slot) { /* no changer support */ return -EINVAL; } retval = scsi_ioctl(scsi_CDs[MINOR(cdi->dev)].device, SCSI_IOCTL_TEST_UNIT_READY, 0); if(retval) { /* Unable to test, unit probably not ready. This usually * means there is no disc in the drive. Mark as changed, * and we will figure it out later once the drive is * available again. */ scsi_CDs[MINOR(cdi->dev)].device->changed = 1; return 1; /* This will force a flush, if called from * check_disk_change */ }; retval = scsi_CDs[MINOR(cdi->dev)].device->changed; scsi_CDs[MINOR(cdi->dev)].device->changed = 0; /* If the disk changed, the capacity will now be different, * so we force a re-read of this information */ if (retval) { /* check multisession offset etc */ sr_cd_check(cdi); /* * If the disk changed, the capacity will now be different, * so we force a re-read of this information * Force 2048 for the sector size so that filesystems won't * be trying to use something that is too small if the disc * has changed. */ scsi_CDs[MINOR(cdi->dev)].needs_sector_size = 1; scsi_CDs[MINOR(cdi->dev)].sector_size = sr_hardsizes[MINOR(cdi->dev)] = 2048; } return retval; } /* * rw_intr is the interrupt routine for the device driver. It will be notified on the * end of a SCSI read / write, and will take on of several actions based on success or failure. */ static void rw_intr (Scsi_Cmnd * SCpnt) { int result = SCpnt->result; int this_count = SCpnt->this_count; int good_sectors = (result == 0 ? this_count : 0); int block_sectors = 0; #ifdef DEBUG printk("sr.c done: %x %x\n",result, SCpnt->request.bh->b_data); #endif /* Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial success. Since this is a relatively rare error condition, no care is taken to avoid unnecessary additional work such as memcpy's that could be avoided. */ if (driver_byte(result) != 0 && /* An error occurred */ SCpnt->sense_buffer[0] == 0xF0 && /* Sense data is valid */ (SCpnt->sense_buffer[2] == MEDIUM_ERROR || SCpnt->sense_buffer[2] == VOLUME_OVERFLOW || SCpnt->sense_buffer[2] == ILLEGAL_REQUEST)) { long error_sector = (SCpnt->sense_buffer[3] << 24) | (SCpnt->sense_buffer[4] << 16) | (SCpnt->sense_buffer[5] << 8) | SCpnt->sense_buffer[6]; int device_nr = DEVICE_NR(SCpnt->request.rq_dev); if (SCpnt->request.bh != NULL) block_sectors = SCpnt->request.bh->b_size >> 9; if (block_sectors < 4) block_sectors = 4; if (scsi_CDs[device_nr].sector_size == 2048) error_sector <<= 2; error_sector &= ~ (block_sectors - 1); good_sectors = error_sector - SCpnt->request.sector; if (good_sectors < 0 || good_sectors >= this_count) good_sectors = 0; /* The SCSI specification allows for the value returned by READ CAPACITY to be up to 75 2K sectors past the last readable block. Therefore, if we hit a medium error within the last 75 2K sectors, we decrease the saved size value. */ if ((error_sector >> 1) < sr_sizes[device_nr] && scsi_CDs[device_nr].capacity - error_sector < 4*75) sr_sizes[device_nr] = error_sector >> 1; } if (good_sectors > 0) { /* Some sectors were read successfully. */ if (SCpnt->use_sg == 0) { if (SCpnt->buffer != SCpnt->request.buffer) { int offset; offset = (SCpnt->request.sector % 4) << 9; memcpy((char *)SCpnt->request.buffer, (char *)SCpnt->buffer + offset, good_sectors << 9); /* Even though we are not using scatter-gather, we look * ahead and see if there is a linked request for the * other half of this buffer. If there is, then satisfy * it. */ if((offset == 0) && good_sectors == 2 && SCpnt->request.nr_sectors > good_sectors && SCpnt->request.bh && SCpnt->request.bh->b_reqnext && SCpnt->request.bh->b_reqnext->b_size == 1024) { memcpy((char *)SCpnt->request.bh->b_reqnext->b_data, (char *)SCpnt->buffer + 1024, 1024); good_sectors += 2; }; scsi_free(SCpnt->buffer, 2048); } } else { struct scatterlist * sgpnt; int i; sgpnt = (struct scatterlist *) SCpnt->buffer; for(i=0; iuse_sg; i++) { if (sgpnt[i].alt_address) { if (sgpnt[i].alt_address != sgpnt[i].address) { memcpy(sgpnt[i].alt_address, sgpnt[i].address, sgpnt[i].length); }; scsi_free(sgpnt[i].address, sgpnt[i].length); }; }; scsi_free(SCpnt->buffer, SCpnt->sglist_len); /* Free list of scatter-gather pointers */ if(SCpnt->request.sector % 4) good_sectors -= 2; /* See if there is a padding record at the end that needs to be removed */ if(good_sectors > SCpnt->request.nr_sectors) good_sectors -= 2; }; #ifdef DEBUG printk("(%x %x %x) ",SCpnt->request.bh, SCpnt->request.nr_sectors, good_sectors); #endif if (SCpnt->request.nr_sectors > this_count) { SCpnt->request.errors = 0; if (!SCpnt->request.bh) panic("sr.c: linked page request (%lx %x)", SCpnt->request.sector, this_count); } SCpnt = end_scsi_request(SCpnt, 1, good_sectors); /* All done */ if (result == 0) { requeue_sr_request(SCpnt); return; } } if (good_sectors == 0) { /* We only come through here if no sectors were read successfully. */ /* Free up any indirection buffers we allocated for DMA purposes. */ if (SCpnt->use_sg) { struct scatterlist * sgpnt; int i; sgpnt = (struct scatterlist *) SCpnt->buffer; for(i=0; iuse_sg; i++) { if (sgpnt[i].alt_address) { scsi_free(sgpnt[i].address, sgpnt[i].length); } } scsi_free(SCpnt->buffer, SCpnt->sglist_len); /* Free list of scatter-gather pointers */ } else { if (SCpnt->buffer != SCpnt->request.buffer) scsi_free(SCpnt->buffer, SCpnt->bufflen); } } if (driver_byte(result) != 0) { if ((SCpnt->sense_buffer[0] & 0x7f) == 0x70) { if ((SCpnt->sense_buffer[2] & 0xf) == UNIT_ATTENTION) { /* detected disc change. set a bit and quietly refuse * further access. */ scsi_CDs[DEVICE_NR(SCpnt->request.rq_dev)].device->changed = 1; SCpnt = end_scsi_request(SCpnt, 0, this_count); requeue_sr_request(SCpnt); return; } } if (SCpnt->sense_buffer[2] == ILLEGAL_REQUEST) { printk("sr%d: CD-ROM error: ", DEVICE_NR(SCpnt->request.rq_dev)); print_sense("sr", SCpnt); printk("command was: "); print_command(SCpnt->cmnd); if (scsi_CDs[DEVICE_NR(SCpnt->request.rq_dev)].ten) { scsi_CDs[DEVICE_NR(SCpnt->request.rq_dev)].ten = 0; requeue_sr_request(SCpnt); result = 0; return; } else { SCpnt = end_scsi_request(SCpnt, 0, this_count); requeue_sr_request(SCpnt); /* Do next request */ return; } } if (SCpnt->sense_buffer[2] == NOT_READY) { printk(KERN_INFO "sr%d: CD-ROM not ready. Make sure you have a disc in the drive.\n", DEVICE_NR(SCpnt->request.rq_dev)); SCpnt = end_scsi_request(SCpnt, 0, this_count); requeue_sr_request(SCpnt); /* Do next request */ return; } if (SCpnt->sense_buffer[2] == MEDIUM_ERROR) { printk("scsi%d: MEDIUM ERROR on " "channel %d, id %d, lun %d, CDB: ", SCpnt->host->host_no, (int) SCpnt->channel, (int) SCpnt->target, (int) SCpnt->lun); print_command(SCpnt->cmnd); print_sense("sr", SCpnt); SCpnt = end_scsi_request(SCpnt, 0, block_sectors); requeue_sr_request(SCpnt); return; } if (SCpnt->sense_buffer[2] == VOLUME_OVERFLOW) { printk("scsi%d: VOLUME OVERFLOW on " "channel %d, id %d, lun %d, CDB: ", SCpnt->host->host_no, (int) SCpnt->channel, (int) SCpnt->target, (int) SCpnt->lun); print_command(SCpnt->cmnd); print_sense("sr", SCpnt); SCpnt = end_scsi_request(SCpnt, 0, block_sectors); requeue_sr_request(SCpnt); return; } } /* We only get this far if we have an error we have not recognized */ if(result) { printk("SCSI CD error : host %d id %d lun %d return code = %03x\n", scsi_CDs[DEVICE_NR(SCpnt->request.rq_dev)].device->host->host_no, scsi_CDs[DEVICE_NR(SCpnt->request.rq_dev)].device->id, scsi_CDs[DEVICE_NR(SCpnt->request.rq_dev)].device->lun, result); if (status_byte(result) == CHECK_CONDITION) print_sense("sr", SCpnt); SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.current_nr_sectors); requeue_sr_request(SCpnt); } } static int sr_open(struct cdrom_device_info *cdi, int purpose) { check_disk_change(cdi->dev); if( MINOR(cdi->dev) >= sr_template.dev_max || !scsi_CDs[MINOR(cdi->dev)].device) { return -ENXIO; /* No such device */ } /* * If the device is in error recovery, wait until it is done. * If the device is offline, then disallow any access to it. */ if( !scsi_block_when_processing_errors(scsi_CDs[MINOR(cdi->dev)].device) ) { return -ENXIO; } scsi_CDs[MINOR(cdi->dev)].device->access_count++; if (scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module) __MOD_INC_USE_COUNT(scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module); if(sr_template.module) __MOD_INC_USE_COUNT(sr_template.module); /* If this device did not have media in the drive at boot time, then * we would have been unable to get the sector size. Check to see if * this is the case, and try again. */ if(scsi_CDs[MINOR(cdi->dev)].needs_sector_size) get_sectorsize(MINOR(cdi->dev)); return 0; } /* * do_sr_request() is the request handler function for the sr driver. * Its function in life is to take block device requests, and * translate them to SCSI commands. */ static void do_sr_request (void) { Scsi_Cmnd * SCpnt = NULL; struct request * req = NULL; Scsi_Device * SDev; unsigned long flags; int flag = 0; while (1==1){ spin_lock_irqsave(&io_request_lock, flags); if (CURRENT != NULL && CURRENT->rq_status == RQ_INACTIVE) { spin_unlock_irqrestore(&io_request_lock, flags); return; }; INIT_SCSI_REQUEST; SDev = scsi_CDs[DEVICE_NR(CURRENT->rq_dev)].device; /* * If the host for this device is in error recovery mode, don't * do anything at all here. When the host leaves error recovery * mode, it will automatically restart things and start queueing * commands again. */ if( SDev->host->in_recovery ) { spin_unlock_irqrestore(&io_request_lock, flags); return; } /* * I am not sure where the best place to do this is. We need * to hook in a place where we are likely to come if in user * space. */ if( SDev->was_reset ) { /* * We need to relock the door, but we might * be in an interrupt handler. Only do this * from user space, since we do not want to * sleep from an interrupt. */ if( SDev->removable && !in_interrupt() ) { spin_unlock_irqrestore(&io_request_lock, flags); scsi_ioctl(SDev, SCSI_IOCTL_DOORLOCK, 0); /* scsi_ioctl may allow CURRENT to change, so start over. */ SDev->was_reset = 0; continue; } SDev->was_reset = 0; } /* we do lazy blocksize switching (when reading XA sectors, * see CDROMREADMODE2 ioctl) */ if (scsi_CDs[DEVICE_NR(CURRENT->rq_dev)].sector_size > 2048) { if (!in_interrupt()) sr_set_blocklength(DEVICE_NR(CURRENT->rq_dev),2048); #if 1 else printk("sr: can't switch blocksize: in interrupt\n"); #endif } if (flag++ == 0) SCpnt = scsi_allocate_device(&CURRENT, scsi_CDs[DEVICE_NR(CURRENT->rq_dev)].device, 0); else SCpnt = NULL; spin_unlock_irqrestore(&io_request_lock, flags); /* This is a performance enhancement. We dig down into the request list and * try to find a queueable request (i.e. device not busy, and host able to * accept another command. If we find one, then we queue it. This can * make a big difference on systems with more than one disk drive. We want * to have the interrupts off when monkeying with the request list, because * otherwise the kernel might try to slip in a request in between somewhere. */ if (!SCpnt && sr_template.nr_dev > 1){ struct request *req1; req1 = NULL; spin_lock_irqsave(&io_request_lock, flags); req = CURRENT; while(req){ SCpnt = scsi_request_queueable(req, scsi_CDs[DEVICE_NR(req->rq_dev)].device); if(SCpnt) break; req1 = req; req = req->next; } if (SCpnt && req->rq_status == RQ_INACTIVE) { if (req == CURRENT) CURRENT = CURRENT->next; else req1->next = req->next; } spin_unlock_irqrestore(&io_request_lock, flags); } if (!SCpnt) return; /* Could not find anything to do */ wake_up(&wait_for_request); /* Queue command */ requeue_sr_request(SCpnt); } /* While */ } void requeue_sr_request (Scsi_Cmnd * SCpnt) { unsigned int dev, block, realcount; unsigned char cmd[10], *buffer, tries; int this_count, start, end_rec; tries = 2; repeat: if(!SCpnt || SCpnt->request.rq_status == RQ_INACTIVE) { do_sr_request(); return; } dev = MINOR(SCpnt->request.rq_dev); block = SCpnt->request.sector; buffer = NULL; this_count = 0; if (dev >= sr_template.nr_dev) { /* printk("CD-ROM request error: invalid device.\n"); */ SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors); tries = 2; goto repeat; } if (!scsi_CDs[dev].use) { /* printk("CD-ROM request error: device marked not in use.\n"); */ SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors); tries = 2; goto repeat; } if( !scsi_CDs[dev].device->online ) { SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors); tries = 2; goto repeat; } if (scsi_CDs[dev].device->changed) { /* * quietly refuse to do anything to a changed disc * until the changed bit has been reset */ /* printk("CD-ROM has been changed. Prohibiting further I/O.\n"); */ SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors); tries = 2; goto repeat; } switch (SCpnt->request.cmd) { case WRITE: SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors); goto repeat; break; case READ : cmd[0] = READ_6; break; default : panic ("Unknown sr command %d\n", SCpnt->request.cmd); } cmd[1] = (SCpnt->lun << 5) & 0xe0; /* * Now do the grungy work of figuring out which sectors we need, and * where in memory we are going to put them. * * The variables we need are: * * this_count= number of 512 byte sectors being read * block = starting cdrom sector to read. * realcount = # of cdrom sectors to read * * The major difference between a scsi disk and a scsi cdrom * is that we will always use scatter-gather if we can, because we can * work around the fact that the buffer cache has a block size of 1024, * and we have 2048 byte sectors. This code should work for buffers that * are any multiple of 512 bytes long. */ SCpnt->use_sg = 0; if (SCpnt->host->sg_tablesize > 0 && (!scsi_need_isa_buffer || scsi_dma_free_sectors >= 10)) { struct buffer_head * bh; struct scatterlist * sgpnt; int count, this_count_max; bh = SCpnt->request.bh; this_count = 0; count = 0; this_count_max = (scsi_CDs[dev].ten ? 0xffff : 0xff) << 4; /* Calculate how many links we can use. First see if we need * a padding record at the start */ this_count = SCpnt->request.sector % 4; if(this_count) count++; while(bh && count < SCpnt->host->sg_tablesize) { if ((this_count + (bh->b_size >> 9)) > this_count_max) break; this_count += (bh->b_size >> 9); count++; bh = bh->b_reqnext; }; /* Fix up in case of an odd record at the end */ end_rec = 0; if(this_count % 4) { if (count < SCpnt->host->sg_tablesize) { count++; end_rec = (4 - (this_count % 4)) << 9; this_count += 4 - (this_count % 4); } else { count--; this_count -= (this_count % 4); }; }; SCpnt->use_sg = count; /* Number of chains */ /* scsi_malloc can only allocate in chunks of 512 bytes */ count = (SCpnt->use_sg * sizeof(struct scatterlist) + 511) & ~511; SCpnt->sglist_len = count; sgpnt = (struct scatterlist * ) scsi_malloc(count); if (!sgpnt) { printk("Warning - running *really* short on DMA buffers\n"); SCpnt->use_sg = 0; /* No memory left - bail out */ } else { buffer = (unsigned char *) sgpnt; count = 0; bh = SCpnt->request.bh; if(SCpnt->request.sector % 4) { sgpnt[count].length = (SCpnt->request.sector % 4) << 9; sgpnt[count].address = (char *) scsi_malloc(sgpnt[count].length); if(!sgpnt[count].address) panic("SCSI DMA pool exhausted."); sgpnt[count].alt_address = sgpnt[count].address; /* Flag to delete if needed */ count++; }; for(bh = SCpnt->request.bh; count < SCpnt->use_sg; count++, bh = bh->b_reqnext) { if (bh) { /* Need a placeholder at the end of the record? */ sgpnt[count].address = bh->b_data; sgpnt[count].length = bh->b_size; sgpnt[count].alt_address = NULL; } else { sgpnt[count].address = (char *) scsi_malloc(end_rec); if(!sgpnt[count].address) panic("SCSI DMA pool exhausted."); sgpnt[count].length = end_rec; sgpnt[count].alt_address = sgpnt[count].address; if (count+1 != SCpnt->use_sg) panic("Bad sr request list"); break; }; if (virt_to_phys(sgpnt[count].address) + sgpnt[count].length - 1 > ISA_DMA_THRESHOLD && SCpnt->host->unchecked_isa_dma) { sgpnt[count].alt_address = sgpnt[count].address; /* We try to avoid exhausting the DMA pool, since it is easier * to control usage here. In other places we might have a more * pressing need, and we would be screwed if we ran out */ if(scsi_dma_free_sectors < (sgpnt[count].length >> 9) + 5) { sgpnt[count].address = NULL; } else { sgpnt[count].address = (char *) scsi_malloc(sgpnt[count].length); }; /* If we start running low on DMA buffers, we abort the scatter-gather * operation, and free all of the memory we have allocated. We want to * ensure that all scsi operations are able to do at least a non-scatter/gather * operation */ if(sgpnt[count].address == NULL){ /* Out of dma memory */ printk("Warning: Running low on SCSI DMA buffers\n"); /* Try switching back to a non scatter-gather operation. */ while(--count >= 0){ if(sgpnt[count].alt_address) scsi_free(sgpnt[count].address, sgpnt[count].length); }; SCpnt->use_sg = 0; scsi_free(buffer, SCpnt->sglist_len); break; }; /* if address == NULL */ }; /* if need DMA fixup */ }; /* for loop to fill list */ #ifdef DEBUG printk("SR: %d %d %d %d %d *** ",SCpnt->use_sg, SCpnt->request.sector, this_count, SCpnt->request.current_nr_sectors, SCpnt->request.nr_sectors); for(count=0; countuse_sg; count++) printk("SGlist: %d %x %x %x\n", count, sgpnt[count].address, sgpnt[count].alt_address, sgpnt[count].length); #endif }; /* Able to allocate scatter-gather list */ }; if (SCpnt->use_sg == 0){ /* We cannot use scatter-gather. Do this the old fashion way */ if (!SCpnt->request.bh) this_count = SCpnt->request.nr_sectors; else this_count = (SCpnt->request.bh->b_size >> 9); start = block % 4; if (start) { this_count = ((this_count > 4 - start) ? (4 - start) : (this_count)); buffer = (unsigned char *) scsi_malloc(2048); } else if (this_count < 4) { buffer = (unsigned char *) scsi_malloc(2048); } else { this_count -= this_count % 4; buffer = (unsigned char *) SCpnt->request.buffer; if (virt_to_phys(buffer) + (this_count << 9) > ISA_DMA_THRESHOLD && SCpnt->host->unchecked_isa_dma) buffer = (unsigned char *) scsi_malloc(this_count << 9); } }; if (scsi_CDs[dev].sector_size == 2048) block = block >> 2; /* These are the sectors that the cdrom uses */ else block = block & 0xfffffffc; realcount = (this_count + 3) / 4; if (scsi_CDs[dev].sector_size == 512) realcount = realcount << 2; /* * Note: The scsi standard says that READ_6 is *optional*, while * READ_10 is mandatory. Thus there is no point in using * READ_6. */ if (scsi_CDs[dev].ten) { if (realcount > 0xffff) { realcount = 0xffff; this_count = realcount * (scsi_CDs[dev].sector_size >> 9); } cmd[0] += READ_10 - READ_6 ; cmd[2] = (unsigned char) (block >> 24) & 0xff; cmd[3] = (unsigned char) (block >> 16) & 0xff; cmd[4] = (unsigned char) (block >> 8) & 0xff; cmd[5] = (unsigned char) block & 0xff; cmd[6] = cmd[9] = 0; cmd[7] = (unsigned char) (realcount >> 8) & 0xff; cmd[8] = (unsigned char) realcount & 0xff; } else { if (realcount > 0xff) { realcount = 0xff; this_count = realcount * (scsi_CDs[dev].sector_size >> 9); } cmd[1] |= (unsigned char) ((block >> 16) & 0x1f); cmd[2] = (unsigned char) ((block >> 8) & 0xff); cmd[3] = (unsigned char) block & 0xff; cmd[4] = (unsigned char) realcount; cmd[5] = 0; } #ifdef DEBUG { int i; printk("ReadCD: %d %d %d %d\n",block, realcount, buffer, this_count); printk("Use sg: %d\n", SCpnt->use_sg); printk("Dumping command: "); for(i=0; i<12; i++) printk("%2.2x ", cmd[i]); printk("\n"); }; #endif /* Some dumb host adapters can speed transfers by knowing the * minimum transfersize in advance. * * We shouldn't disconnect in the middle of a sector, but the cdrom * sector size can be larger than the size of a buffer and the * transfer may be split to the size of a buffer. So it's safe to * assume that we can at least transfer the minimum of the buffer * size (1024) and the sector size between each connect / disconnect. */ SCpnt->transfersize = (scsi_CDs[dev].sector_size > 1024) ? 1024 : scsi_CDs[dev].sector_size; SCpnt->this_count = this_count; scsi_do_cmd (SCpnt, (void *) cmd, buffer, realcount * scsi_CDs[dev].sector_size, rw_intr, SR_TIMEOUT, MAX_RETRIES); } static int sr_detect(Scsi_Device * SDp){ if(SDp->type != TYPE_ROM && SDp->type != TYPE_WORM) return 0; printk("Detected scsi CD-ROM sr%d at scsi%d, channel %d, id %d, lun %d\n", sr_template.dev_noticed++, SDp->host->host_no, SDp->channel, SDp->id, SDp->lun); return 1; } static int sr_attach(Scsi_Device * SDp){ Scsi_CD * cpnt; int i; if(SDp->type != TYPE_ROM && SDp->type != TYPE_WORM) return 1; if (sr_template.nr_dev >= sr_template.dev_max) { SDp->attached--; return 1; } for(cpnt = scsi_CDs, i=0; idevice) break; if(i >= sr_template.dev_max) panic ("scsi_devices corrupt (sr)"); SDp->scsi_request_fn = do_sr_request; scsi_CDs[i].device = SDp; sr_template.nr_dev++; if(sr_template.nr_dev > sr_template.dev_max) panic ("scsi_devices corrupt (sr)"); return 0; } static void sr_init_done (Scsi_Cmnd * SCpnt) { struct request * req; req = &SCpnt->request; req->rq_status = RQ_SCSI_DONE; /* Busy, but indicate request done */ if (req->sem != NULL) { up(req->sem); } } void get_sectorsize(int i){ unsigned char cmd[10]; unsigned char *buffer; int the_result, retries; Scsi_Cmnd * SCpnt; buffer = (unsigned char *) scsi_malloc(512); SCpnt = scsi_allocate_device(NULL, scsi_CDs[i].device, 1); retries = 3; do { cmd[0] = READ_CAPACITY; cmd[1] = (scsi_CDs[i].device->lun << 5) & 0xe0; memset ((void *) &cmd[2], 0, 8); SCpnt->request.rq_status = RQ_SCSI_BUSY; /* Mark as really busy */ SCpnt->cmd_len = 0; memset(buffer, 0, 8); /* Do the command and wait.. */ { struct semaphore sem = MUTEX_LOCKED; SCpnt->request.sem = &sem; scsi_do_cmd (SCpnt, (void *) cmd, (void *) buffer, 512, sr_init_done, SR_TIMEOUT, MAX_RETRIES); down(&sem); } the_result = SCpnt->result; retries--; } while(the_result && retries); wake_up(&SCpnt->device->device_wait); scsi_release_command(SCpnt); SCpnt = NULL; if (the_result) { scsi_CDs[i].capacity = 0x1fffff; scsi_CDs[i].sector_size = 2048; /* A guess, just in case */ scsi_CDs[i].needs_sector_size = 1; } else { scsi_CDs[i].capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]); scsi_CDs[i].sector_size = (buffer[4] << 24) | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; switch (scsi_CDs[i].sector_size) { /* * HP 4020i CD-Recorder reports 2340 byte sectors * Philips CD-Writers report 2352 byte sectors * * Use 2k sectors for them.. */ case 0: case 2340: case 2352: scsi_CDs[i].sector_size = 2048; /* fall through */ case 2048: scsi_CDs[i].capacity *= 4; /* fall through */ case 512: break; default: printk ("sr%d: unsupported sector size %d.\n", i, scsi_CDs[i].sector_size); scsi_CDs[i].capacity = 0; scsi_CDs[i].needs_sector_size = 1; } /* * Add this so that we have the ability to correctly gauge * what the device is capable of. */ sr_hardsizes[i] = scsi_CDs[i].sector_size; scsi_CDs[i].needs_sector_size = 0; sr_sizes[i] = scsi_CDs[i].capacity >> (BLOCK_SIZE_BITS - 9); }; scsi_free(buffer, 512); } void get_capabilities(int i){ unsigned char cmd[6]; unsigned char *buffer; int rc,n; static char *loadmech[] = { "caddy", "tray", "pop-up", "", "changer", "changer", "", "" }; buffer = (unsigned char *) scsi_malloc(512); cmd[0] = MODE_SENSE; cmd[1] = (scsi_CDs[i].device->lun << 5) & 0xe0; cmd[2] = 0x2a; cmd[4] = 128; cmd[3] = cmd[5] = 0; rc = sr_do_ioctl(i, cmd, buffer, 128, 1); if (-EINVAL == rc) { /* failed, drive has'nt this mode page */ scsi_CDs[i].cdi.speed = 1; /* disable speed select, drive probably can't do this either */ scsi_CDs[i].cdi.mask |= CDC_SELECT_SPEED; } else { n = buffer[3]+4; scsi_CDs[i].cdi.speed = ((buffer[n+8] << 8) + buffer[n+9])/176; scsi_CDs[i].readcd_known = 1; scsi_CDs[i].readcd_cdda = buffer[n+5] & 0x01; /* print some capability bits */ printk("sr%i: scsi3-mmc drive: %dx/%dx %s%s%s%s%s\n",i, ((buffer[n+14] << 8) + buffer[n+15])/176, scsi_CDs[i].cdi.speed, buffer[n+3]&0x01 ? "writer " : "", /* CD Writer */ buffer[n+2]&0x02 ? "cd/rw " : "", /* can read rewriteable */ buffer[n+4]&0x20 ? "xa/form2 " : "", /* can read xa/from2 */ buffer[n+5]&0x01 ? "cdda " : "", /* can read audio data */ loadmech[buffer[n+6]>>5]); if ((buffer[n+6] >> 5) == 0) /* caddy drives can't close tray... */ scsi_CDs[i].cdi.mask |= CDC_CLOSE_TRAY; } scsi_free(buffer, 512); } static int sr_registered = 0; static int sr_init() { int i; if(sr_template.dev_noticed == 0) return 0; if(!sr_registered) { if (register_blkdev(MAJOR_NR,"sr",&cdrom_fops)) { printk("Unable to get major %d for SCSI-CD\n",MAJOR_NR); return 1; } sr_registered++; } if (scsi_CDs) return 0; sr_template.dev_max = sr_template.dev_noticed + SR_EXTRA_DEVS; scsi_CDs = (Scsi_CD *) scsi_init_malloc(sr_template.dev_max * sizeof(Scsi_CD), GFP_ATOMIC); memset(scsi_CDs, 0, sr_template.dev_max * sizeof(Scsi_CD)); sr_sizes = (int *) scsi_init_malloc(sr_template.dev_max * sizeof(int), GFP_ATOMIC); memset(sr_sizes, 0, sr_template.dev_max * sizeof(int)); sr_blocksizes = (int *) scsi_init_malloc(sr_template.dev_max * sizeof(int), GFP_ATOMIC); sr_hardsizes = (int *) scsi_init_malloc(sr_template.dev_max * sizeof(int), GFP_ATOMIC); /* * These are good guesses for the time being. */ for(i=0;ichanged = 1; /* force recheck CD type */ #if 0 /* seems better to leave this for later */ get_sectorsize(i); printk("Scd sectorsize = %d bytes.\n", scsi_CDs[i].sector_size); #endif scsi_CDs[i].use = 1; scsi_CDs[i].ten = 1; scsi_CDs[i].remap = 1; scsi_CDs[i].readcd_known = 0; scsi_CDs[i].readcd_cdda = 0; sr_sizes[i] = scsi_CDs[i].capacity >> (BLOCK_SIZE_BITS - 9); scsi_CDs[i].cdi.ops = &sr_dops; scsi_CDs[i].cdi.handle = &scsi_CDs[i]; scsi_CDs[i].cdi.dev = MKDEV(MAJOR_NR,i); scsi_CDs[i].cdi.mask = 0; scsi_CDs[i].cdi.capacity = 1; get_capabilities(i); sr_vendor_init(i); sprintf(name, "sr%d", i); strcpy(scsi_CDs[i].cdi.name, name); register_cdrom(&scsi_CDs[i].cdi); } /* If our host adapter is capable of scatter-gather, then we increase * the read-ahead to 16 blocks (32 sectors). If not, we use * a two block (4 sector) read ahead. */ if(scsi_CDs[0].device && scsi_CDs[0].device->host->sg_tablesize) read_ahead[MAJOR_NR] = 32; /* 32 sector read-ahead. Always removable. */ else read_ahead[MAJOR_NR] = 4; /* 4 sector read-ahead */ return; } static void sr_detach(Scsi_Device * SDp) { Scsi_CD * cpnt; int i; for(cpnt = scsi_CDs, i=0; idevice == SDp) { kdev_t devi = MKDEV(MAJOR_NR, i); struct super_block * sb = get_super(devi); /* * Since the cdrom is read-only, no need to sync the device. * We should be kind to our buffer cache, however. */ if (sb) invalidate_inodes(sb); invalidate_buffers(devi); /* * Reset things back to a sane state so that one can re-load a new * driver (perhaps the same one). */ unregister_cdrom(&(cpnt->cdi)); cpnt->device = NULL; cpnt->capacity = 0; SDp->attached--; sr_template.nr_dev--; sr_template.dev_noticed--; sr_sizes[i] = 0; return; } return; } #ifdef MODULE int init_module(void) { sr_template.module = &__this_module; return scsi_register_module(MODULE_SCSI_DEV, &sr_template); } void cleanup_module( void) { scsi_unregister_module(MODULE_SCSI_DEV, &sr_template); unregister_blkdev(MAJOR_NR, "sr"); sr_registered--; if(scsi_CDs != NULL) { scsi_init_free((char *) scsi_CDs, (sr_template.dev_noticed + SR_EXTRA_DEVS) * sizeof(Scsi_CD)); scsi_init_free((char *) sr_sizes, sr_template.dev_max * sizeof(int)); sr_sizes = NULL; scsi_init_free((char *) sr_blocksizes, sr_template.dev_max * sizeof(int)); sr_blocksizes = NULL; scsi_init_free((char *) sr_hardsizes, sr_template.dev_max * sizeof(int)); sr_hardsizes = NULL; } blksize_size[MAJOR_NR] = NULL; blk_dev[MAJOR_NR].request_fn = NULL; blk_size[MAJOR_NR] = NULL; read_ahead[MAJOR_NR] = 0; sr_template.dev_max = 0; } #endif /* MODULE */ /* * 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: */