diff options
Diffstat (limited to 'drivers/scsi/scsi_transport_spi.c')
| -rw-r--r-- | drivers/scsi/scsi_transport_spi.c | 1020 |
1 files changed, 1020 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c new file mode 100644 index 00000000000..303d7656f71 --- /dev/null +++ b/drivers/scsi/scsi_transport_spi.c @@ -0,0 +1,1020 @@ +/* + * Parallel SCSI (SPI) transport specific attributes exported to sysfs. + * + * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved. + * Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#include <linux/ctype.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/workqueue.h> +#include <asm/semaphore.h> +#include <scsi/scsi.h> +#include "scsi_priv.h" +#include <scsi/scsi_device.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_request.h> +#include <scsi/scsi_eh.h> +#include <scsi/scsi_transport.h> +#include <scsi/scsi_transport_spi.h> + +#define SPI_PRINTK(x, l, f, a...) dev_printk(l, &(x)->dev, f , ##a) + +#define SPI_NUM_ATTRS 10 /* increase this if you add attributes */ +#define SPI_OTHER_ATTRS 1 /* Increase this if you add "always + * on" attributes */ +#define SPI_HOST_ATTRS 1 + +#define SPI_MAX_ECHO_BUFFER_SIZE 4096 + +/* Private data accessors (keep these out of the header file) */ +#define spi_dv_pending(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_pending) +#define spi_dv_sem(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_sem) + +struct spi_internal { + struct scsi_transport_template t; + struct spi_function_template *f; + /* The actual attributes */ + struct class_device_attribute private_attrs[SPI_NUM_ATTRS]; + /* The array of null terminated pointers to attributes + * needed by scsi_sysfs.c */ + struct class_device_attribute *attrs[SPI_NUM_ATTRS + SPI_OTHER_ATTRS + 1]; + struct class_device_attribute private_host_attrs[SPI_HOST_ATTRS]; + struct class_device_attribute *host_attrs[SPI_HOST_ATTRS + 1]; +}; + +#define to_spi_internal(tmpl) container_of(tmpl, struct spi_internal, t) + +static const int ppr_to_ps[] = { + /* The PPR values 0-6 are reserved, fill them in when + * the committee defines them */ + -1, /* 0x00 */ + -1, /* 0x01 */ + -1, /* 0x02 */ + -1, /* 0x03 */ + -1, /* 0x04 */ + -1, /* 0x05 */ + -1, /* 0x06 */ + 3125, /* 0x07 */ + 6250, /* 0x08 */ + 12500, /* 0x09 */ + 25000, /* 0x0a */ + 30300, /* 0x0b */ + 50000, /* 0x0c */ +}; +/* The PPR values at which you calculate the period in ns by multiplying + * by 4 */ +#define SPI_STATIC_PPR 0x0c + +static int sprint_frac(char *dest, int value, int denom) +{ + int frac = value % denom; + int result = sprintf(dest, "%d", value / denom); + + if (frac == 0) + return result; + dest[result++] = '.'; + + do { + denom /= 10; + sprintf(dest + result, "%d", frac / denom); + result++; + frac %= denom; + } while (frac); + + dest[result++] = '\0'; + return result; +} + +static struct { + enum spi_signal_type value; + char *name; +} signal_types[] = { + { SPI_SIGNAL_UNKNOWN, "unknown" }, + { SPI_SIGNAL_SE, "SE" }, + { SPI_SIGNAL_LVD, "LVD" }, + { SPI_SIGNAL_HVD, "HVD" }, +}; + +static inline const char *spi_signal_to_string(enum spi_signal_type type) +{ + int i; + + for (i = 0; i < sizeof(signal_types)/sizeof(signal_types[0]); i++) { + if (type == signal_types[i].value) + return signal_types[i].name; + } + return NULL; +} +static inline enum spi_signal_type spi_signal_to_value(const char *name) +{ + int i, len; + + for (i = 0; i < sizeof(signal_types)/sizeof(signal_types[0]); i++) { + len = strlen(signal_types[i].name); + if (strncmp(name, signal_types[i].name, len) == 0 && + (name[len] == '\n' || name[len] == '\0')) + return signal_types[i].value; + } + return SPI_SIGNAL_UNKNOWN; +} + +static int spi_host_setup(struct device *dev) +{ + struct Scsi_Host *shost = dev_to_shost(dev); + + spi_signalling(shost) = SPI_SIGNAL_UNKNOWN; + + return 0; +} + +static DECLARE_TRANSPORT_CLASS(spi_host_class, + "spi_host", + spi_host_setup, + NULL, + NULL); + +static int spi_host_match(struct attribute_container *cont, + struct device *dev) +{ + struct Scsi_Host *shost; + struct spi_internal *i; + + if (!scsi_is_host_device(dev)) + return 0; + + shost = dev_to_shost(dev); + if (!shost->transportt || shost->transportt->host_attrs.ac.class + != &spi_host_class.class) + return 0; + + i = to_spi_internal(shost->transportt); + + return &i->t.host_attrs.ac == cont; +} + +static int spi_device_configure(struct device *dev) +{ + struct scsi_device *sdev = to_scsi_device(dev); + struct scsi_target *starget = sdev->sdev_target; + + /* Populate the target capability fields with the values + * gleaned from the device inquiry */ + + spi_support_sync(starget) = scsi_device_sync(sdev); + spi_support_wide(starget) = scsi_device_wide(sdev); + spi_support_dt(starget) = scsi_device_dt(sdev); + spi_support_dt_only(starget) = scsi_device_dt_only(sdev); + spi_support_ius(starget) = scsi_device_ius(sdev); + spi_support_qas(starget) = scsi_device_qas(sdev); + + return 0; +} + +static int spi_setup_transport_attrs(struct device *dev) +{ + struct scsi_target *starget = to_scsi_target(dev); + + spi_period(starget) = -1; /* illegal value */ + spi_offset(starget) = 0; /* async */ + spi_width(starget) = 0; /* narrow */ + spi_iu(starget) = 0; /* no IU */ + spi_dt(starget) = 0; /* ST */ + spi_qas(starget) = 0; + spi_wr_flow(starget) = 0; + spi_rd_strm(starget) = 0; + spi_rti(starget) = 0; + spi_pcomp_en(starget) = 0; + spi_dv_pending(starget) = 0; + spi_initial_dv(starget) = 0; + init_MUTEX(&spi_dv_sem(starget)); + + return 0; +} + +#define spi_transport_show_function(field, format_string) \ + \ +static ssize_t \ +show_spi_transport_##field(struct class_device *cdev, char *buf) \ +{ \ + struct scsi_target *starget = transport_class_to_starget(cdev); \ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ + struct spi_transport_attrs *tp; \ + struct spi_internal *i = to_spi_internal(shost->transportt); \ + tp = (struct spi_transport_attrs *)&starget->starget_data; \ + if (i->f->get_##field) \ + i->f->get_##field(starget); \ + return snprintf(buf, 20, format_string, tp->field); \ +} + +#define spi_transport_store_function(field, format_string) \ +static ssize_t \ +store_spi_transport_##field(struct class_device *cdev, const char *buf, \ + size_t count) \ +{ \ + int val; \ + struct scsi_target *starget = transport_class_to_starget(cdev); \ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ + struct spi_internal *i = to_spi_internal(shost->transportt); \ + \ + val = simple_strtoul(buf, NULL, 0); \ + i->f->set_##field(starget, val); \ + return count; \ +} + +#define spi_transport_rd_attr(field, format_string) \ + spi_transport_show_function(field, format_string) \ + spi_transport_store_function(field, format_string) \ +static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \ + show_spi_transport_##field, \ + store_spi_transport_##field); + +/* The Parallel SCSI Tranport Attributes: */ +spi_transport_rd_attr(offset, "%d\n"); +spi_transport_rd_attr(width, "%d\n"); +spi_transport_rd_attr(iu, "%d\n"); +spi_transport_rd_attr(dt, "%d\n"); +spi_transport_rd_attr(qas, "%d\n"); +spi_transport_rd_attr(wr_flow, "%d\n"); +spi_transport_rd_attr(rd_strm, "%d\n"); +spi_transport_rd_attr(rti, "%d\n"); +spi_transport_rd_attr(pcomp_en, "%d\n"); + +static ssize_t +store_spi_revalidate(struct class_device *cdev, const char *buf, size_t count) +{ + struct scsi_target *starget = transport_class_to_starget(cdev); + + /* FIXME: we're relying on an awful lot of device internals + * here. We really need a function to get the first available + * child */ + struct device *dev = container_of(starget->dev.children.next, struct device, node); + struct scsi_device *sdev = to_scsi_device(dev); + spi_dv_device(sdev); + return count; +} +static CLASS_DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate); + +/* Translate the period into ns according to the current spec + * for SDTR/PPR messages */ +static ssize_t show_spi_transport_period(struct class_device *cdev, char *buf) + +{ + struct scsi_target *starget = transport_class_to_starget(cdev); + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct spi_transport_attrs *tp; + int len, picosec; + struct spi_internal *i = to_spi_internal(shost->transportt); + + tp = (struct spi_transport_attrs *)&starget->starget_data; + + if (i->f->get_period) + i->f->get_period(starget); + + if (tp->period < 0 || tp->period > 0xff) { + picosec = -1; + } else if (tp->period <= SPI_STATIC_PPR) { + picosec = ppr_to_ps[tp->period]; + } else { + picosec = tp->period * 4000; + } + + if (picosec == -1) { + len = sprintf(buf, "reserved"); + } else { + len = sprint_frac(buf, picosec, 1000); + } + + buf[len++] = '\n'; + buf[len] = '\0'; + return len; +} + +static ssize_t +store_spi_transport_period(struct class_device *cdev, const char *buf, + size_t count) +{ + struct scsi_target *starget = transport_class_to_starget(cdev); + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct spi_internal *i = to_spi_internal(shost->transportt); + int j, picosec, period = -1; + char *endp; + + picosec = simple_strtoul(buf, &endp, 10) * 1000; + if (*endp == '.') { + int mult = 100; + do { + endp++; + if (!isdigit(*endp)) + break; + picosec += (*endp - '0') * mult; + mult /= 10; + } while (mult > 0); + } + + for (j = 0; j <= SPI_STATIC_PPR; j++) { + if (ppr_to_ps[j] < picosec) + continue; + period = j; + break; + } + + if (period == -1) + period = picosec / 4000; + + if (period > 0xff) + period = 0xff; + + i->f->set_period(starget, period); + + return count; +} + +static CLASS_DEVICE_ATTR(period, S_IRUGO | S_IWUSR, + show_spi_transport_period, + store_spi_transport_period); + +static ssize_t show_spi_host_signalling(struct class_device *cdev, char *buf) +{ + struct Scsi_Host *shost = transport_class_to_shost(cdev); + struct spi_internal *i = to_spi_internal(shost->transportt); + + if (i->f->get_signalling) + i->f->get_signalling(shost); + + return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost))); +} +static ssize_t store_spi_host_signalling(struct class_device *cdev, + const char *buf, size_t count) +{ + struct Scsi_Host *shost = transport_class_to_shost(cdev); + struct spi_internal *i = to_spi_internal(shost->transportt); + enum spi_signal_type type = spi_signal_to_value(buf); + + if (type != SPI_SIGNAL_UNKNOWN) + i->f->set_signalling(shost, type); + + return count; +} +static CLASS_DEVICE_ATTR(signalling, S_IRUGO | S_IWUSR, + show_spi_host_signalling, + store_spi_host_signalling); + +#define DV_SET(x, y) \ + if(i->f->set_##x) \ + i->f->set_##x(sdev->sdev_target, y) + +#define DV_LOOPS 3 +#define DV_TIMEOUT (10*HZ) +#define DV_RETRIES 3 /* should only need at most + * two cc/ua clears */ + +enum spi_compare_returns { + SPI_COMPARE_SUCCESS, + SPI_COMPARE_FAILURE, + SPI_COMPARE_SKIP_TEST, +}; + + +/* This is for read/write Domain Validation: If the device supports + * an echo buffer, we do read/write tests to it */ +static enum spi_compare_returns +spi_dv_device_echo_buffer(struct scsi_request *sreq, u8 *buffer, + u8 *ptr, const int retries) +{ + struct scsi_device *sdev = sreq->sr_device; + int len = ptr - buffer; + int j, k, r; + unsigned int pattern = 0x0000ffff; + + const char spi_write_buffer[] = { + WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0 + }; + const char spi_read_buffer[] = { + READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0 + }; + + /* set up the pattern buffer. Doesn't matter if we spill + * slightly beyond since that's where the read buffer is */ + for (j = 0; j < len; ) { + + /* fill the buffer with counting (test a) */ + for ( ; j < min(len, 32); j++) + buffer[j] = j; + k = j; + /* fill the buffer with alternating words of 0x0 and + * 0xffff (test b) */ + for ( ; j < min(len, k + 32); j += 2) { + u16 *word = (u16 *)&buffer[j]; + + *word = (j & 0x02) ? 0x0000 : 0xffff; + } + k = j; + /* fill with crosstalk (alternating 0x5555 0xaaa) + * (test c) */ + for ( ; j < min(len, k + 32); j += 2) { + u16 *word = (u16 *)&buffer[j]; + + *word = (j & 0x02) ? 0x5555 : 0xaaaa; + } + k = j; + /* fill with shifting bits (test d) */ + for ( ; j < min(len, k + 32); j += 4) { + u32 *word = (unsigned int *)&buffer[j]; + u32 roll = (pattern & 0x80000000) ? 1 : 0; + + *word = pattern; + pattern = (pattern << 1) | roll; + } + /* don't bother with random data (test e) */ + } + + for (r = 0; r < retries; r++) { + sreq->sr_cmd_len = 0; /* wait_req to fill in */ + sreq->sr_data_direction = DMA_TO_DEVICE; + scsi_wait_req(sreq, spi_write_buffer, buffer, len, + DV_TIMEOUT, DV_RETRIES); + if(sreq->sr_result || !scsi_device_online(sdev)) { + struct scsi_sense_hdr sshdr; + + scsi_device_set_state(sdev, SDEV_QUIESCE); + if (scsi_request_normalize_sense(sreq, &sshdr) + && sshdr.sense_key == ILLEGAL_REQUEST + /* INVALID FIELD IN CDB */ + && sshdr.asc == 0x24 && sshdr.ascq == 0x00) + /* This would mean that the drive lied + * to us about supporting an echo + * buffer (unfortunately some Western + * Digital drives do precisely this) + */ + return SPI_COMPARE_SKIP_TEST; + + + SPI_PRINTK(sdev->sdev_target, KERN_ERR, "Write Buffer failure %x\n", sreq->sr_result); + return SPI_COMPARE_FAILURE; + } + + memset(ptr, 0, len); + sreq->sr_cmd_len = 0; /* wait_req to fill in */ + sreq->sr_data_direction = DMA_FROM_DEVICE; + scsi_wait_req(sreq, spi_read_buffer, ptr, len, + DV_TIMEOUT, DV_RETRIES); + scsi_device_set_state(sdev, SDEV_QUIESCE); + + if (memcmp(buffer, ptr, len) != 0) + return SPI_COMPARE_FAILURE; + } + return SPI_COMPARE_SUCCESS; +} + +/* This is for the simplest form of Domain Validation: a read test + * on the inquiry data from the device */ +static enum spi_compare_returns +spi_dv_device_compare_inquiry(struct scsi_request *sreq, u8 *buffer, + u8 *ptr, const int retries) +{ + int r; + const int len = sreq->sr_device->inquiry_len; + struct scsi_device *sdev = sreq->sr_device; + const char spi_inquiry[] = { + INQUIRY, 0, 0, 0, len, 0 + }; + + for (r = 0; r < retries; r++) { + sreq->sr_cmd_len = 0; /* wait_req to fill in */ + sreq->sr_data_direction = DMA_FROM_DEVICE; + + memset(ptr, 0, len); + + scsi_wait_req(sreq, spi_inquiry, ptr, len, + DV_TIMEOUT, DV_RETRIES); + + if(sreq->sr_result || !scsi_device_online(sdev)) { + scsi_device_set_state(sdev, SDEV_QUIESCE); + return SPI_COMPARE_FAILURE; + } + + /* If we don't have the inquiry data already, the + * first read gets it */ + if (ptr == buffer) { + ptr += len; + --r; + continue; + } + + if (memcmp(buffer, ptr, len) != 0) + /* failure */ + return SPI_COMPARE_FAILURE; + } + return SPI_COMPARE_SUCCESS; +} + +static enum spi_compare_returns +spi_dv_retrain(struct scsi_request *sreq, u8 *buffer, u8 *ptr, + enum spi_compare_returns + (*compare_fn)(struct scsi_request *, u8 *, u8 *, int)) +{ + struct spi_internal *i = to_spi_internal(sreq->sr_host->transportt); + struct scsi_device *sdev = sreq->sr_device; + int period = 0, prevperiod = 0; + enum spi_compare_returns retval; + + + for (;;) { + int newperiod; + retval = compare_fn(sreq, buffer, ptr, DV_LOOPS); + + if (retval == SPI_COMPARE_SUCCESS + || retval == SPI_COMPARE_SKIP_TEST) + break; + + /* OK, retrain, fallback */ + if (i->f->get_period) + i->f->get_period(sdev->sdev_target); + newperiod = spi_period(sdev->sdev_target); + period = newperiod > period ? newperiod : period; + if (period < 0x0d) + period++; + else + period += period >> 1; + + if (unlikely(period > 0xff || period == prevperiod)) { + /* Total failure; set to async and return */ + SPI_PRINTK(sdev->sdev_target, KERN_ERR, "Domain Validation Failure, dropping back to Asynchronous\n"); + DV_SET(offset, 0); + return SPI_COMPARE_FAILURE; + } + SPI_PRINTK(sdev->sdev_target, KERN_ERR, "Domain Validation detected failure, dropping back\n"); + DV_SET(period, period); + prevperiod = period; + } + return retval; +} + +static int +spi_dv_device_get_echo_buffer(struct scsi_request *sreq, u8 *buffer) +{ + int l; + + /* first off do a test unit ready. This can error out + * because of reservations or some other reason. If it + * fails, the device won't let us write to the echo buffer + * so just return failure */ + + const char spi_test_unit_ready[] = { + TEST_UNIT_READY, 0, 0, 0, 0, 0 + }; + + const char spi_read_buffer_descriptor[] = { + READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0 + }; + + + sreq->sr_cmd_len = 0; + sreq->sr_data_direction = DMA_NONE; + + /* We send a set of three TURs to clear any outstanding + * unit attention conditions if they exist (Otherwise the + * buffer tests won't be happy). If the TUR still fails + * (reservation conflict, device not ready, etc) just + * skip the write tests */ + for (l = 0; ; l++) { + scsi_wait_req(sreq, spi_test_unit_ready, NULL, 0, + DV_TIMEOUT, DV_RETRIES); + + if(sreq->sr_result) { + if(l >= 3) + return 0; + } else { + /* TUR succeeded */ + break; + } + } + + sreq->sr_cmd_len = 0; + sreq->sr_data_direction = DMA_FROM_DEVICE; + + scsi_wait_req(sreq, spi_read_buffer_descriptor, buffer, 4, + DV_TIMEOUT, DV_RETRIES); + + if (sreq->sr_result) + /* Device has no echo buffer */ + return 0; + + return buffer[3] + ((buffer[2] & 0x1f) << 8); +} + +static void +spi_dv_device_internal(struct scsi_request *sreq, u8 *buffer) +{ + struct spi_internal *i = to_spi_internal(sreq->sr_host->transportt); + struct scsi_device *sdev = sreq->sr_device; + int len = sdev->inquiry_len; + /* first set us up for narrow async */ + DV_SET(offset, 0); + DV_SET(width, 0); + + if (spi_dv_device_compare_inquiry(sreq, buffer, buffer, DV_LOOPS) + != SPI_COMPARE_SUCCESS) { + SPI_PRINTK(sdev->sdev_target, KERN_ERR, "Domain Validation Initial Inquiry Failed\n"); + /* FIXME: should probably offline the device here? */ + return; + } + + /* test width */ + if (i->f->set_width && sdev->wdtr) { + i->f->set_width(sdev->sdev_target, 1); + + if (spi_dv_device_compare_inquiry(sreq, buffer, + buffer + len, + DV_LOOPS) + != SPI_COMPARE_SUCCESS) { + SPI_PRINTK(sdev->sdev_target, KERN_ERR, "Wide Transfers Fail\n"); + i->f->set_width(sdev->sdev_target, 0); + } + } + + if (!i->f->set_period) + return; + + /* device can't handle synchronous */ + if(!sdev->ppr && !sdev->sdtr) + return; + + /* see if the device has an echo buffer. If it does we can + * do the SPI pattern write tests */ + + len = 0; + if (sdev->ppr) + len = spi_dv_device_get_echo_buffer(sreq, buffer); + + retry: + + /* now set up to the maximum */ + DV_SET(offset, 255); + DV_SET(period, 1); + + if (len == 0) { + SPI_PRINTK(sdev->sdev_target, KERN_INFO, "Domain Validation skipping write tests\n"); + spi_dv_retrain(sreq, buffer, buffer + len, + spi_dv_device_compare_inquiry); + return; + } + + if (len > SPI_MAX_ECHO_BUFFER_SIZE) { + SPI_PRINTK(sdev->sdev_target, KERN_WARNING, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE); + len = SPI_MAX_ECHO_BUFFER_SIZE; + } + + if (spi_dv_retrain(sreq, buffer, buffer + len, + spi_dv_device_echo_buffer) + == SPI_COMPARE_SKIP_TEST) { + /* OK, the stupid drive can't do a write echo buffer + * test after all, fall back to the read tests */ + len = 0; + goto retry; + } +} + + +/** spi_dv_device - Do Domain Validation on the device + * @sdev: scsi device to validate + * + * Performs the domain validation on the given device in the + * current execution thread. Since DV operations may sleep, + * the current thread must have user context. Also no SCSI + * related locks that would deadlock I/O issued by the DV may + * be held. + */ +void +spi_dv_device(struct scsi_device *sdev) +{ + struct scsi_request *sreq = scsi_allocate_request(sdev, GFP_KERNEL); + struct scsi_target *starget = sdev->sdev_target; + u8 *buffer; + const int len = SPI_MAX_ECHO_BUFFER_SIZE*2; + + if (unlikely(!sreq)) + return; + + if (unlikely(scsi_device_get(sdev))) + goto out_free_req; + + buffer = kmalloc(len, GFP_KERNEL); + + if (unlikely(!buffer)) + goto out_put; + + memset(buffer, 0, len); + + /* We need to verify that the actual device will quiesce; the + * later target quiesce is just a nice to have */ + if (unlikely(scsi_device_quiesce(sdev))) + goto out_free; + + scsi_target_quiesce(starget); + + spi_dv_pending(starget) = 1; + down(&spi_dv_sem(starget)); + + SPI_PRINTK(starget, KERN_INFO, "Beginning Domain Validation\n"); + + spi_dv_device_internal(sreq, buffer); + + SPI_PRINTK(starget, KERN_INFO, "Ending Domain Validation\n"); + + up(&spi_dv_sem(starget)); + spi_dv_pending(starget) = 0; + + scsi_target_resume(starget); + + spi_initial_dv(starget) = 1; + + out_free: + kfree(buffer); + out_put: + scsi_device_put(sdev); + out_free_req: + scsi_release_request(sreq); +} +EXPORT_SYMBOL(spi_dv_device); + +struct work_queue_wrapper { + struct work_struct work; + struct scsi_device *sdev; +}; + +static void +spi_dv_device_work_wrapper(void *data) +{ + struct work_queue_wrapper *wqw = (struct work_queue_wrapper *)data; + struct scsi_device *sdev = wqw->sdev; + + kfree(wqw); + spi_dv_device(sdev); + spi_dv_pending(sdev->sdev_target) = 0; + scsi_device_put(sdev); +} + + +/** + * spi_schedule_dv_device - schedule domain validation to occur on the device + * @sdev: The device to validate + * + * Identical to spi_dv_device() above, except that the DV will be + * scheduled to occur in a workqueue later. All memory allocations + * are atomic, so may be called from any context including those holding + * SCSI locks. + */ +void +spi_schedule_dv_device(struct scsi_device *sdev) +{ + struct work_queue_wrapper *wqw = + kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC); + + if (unlikely(!wqw)) + return; + + if (unlikely(spi_dv_pending(sdev->sdev_target))) { + kfree(wqw); + return; + } + /* Set pending early (dv_device doesn't check it, only sets it) */ + spi_dv_pending(sdev->sdev_target) = 1; + if (unlikely(scsi_device_get(sdev))) { + kfree(wqw); + spi_dv_pending(sdev->sdev_target) = 0; + return; + } + + INIT_WORK(&wqw->work, spi_dv_device_work_wrapper, wqw); + wqw->sdev = sdev; + + schedule_work(&wqw->work); +} +EXPORT_SYMBOL(spi_schedule_dv_device); + +/** + * spi_display_xfer_agreement - Print the current target transfer agreement + * @starget: The target for which to display the agreement + * + * Each SPI port is required to maintain a transfer agreement for each + * other port on the bus. This function prints a one-line summary of + * the current agreement; more detailed information is available in sysfs. + */ +void spi_display_xfer_agreement(struct scsi_target *starget) +{ + struct spi_transport_attrs *tp; + tp = (struct spi_transport_attrs *)&starget->starget_data; + + if (tp->offset > 0 && tp->period > 0) { + unsigned int picosec, kb100; + char *scsi = "FAST-?"; + char tmp[8]; + + if (tp->period <= SPI_STATIC_PPR) { + picosec = ppr_to_ps[tp->period]; + switch (tp->period) { + case 7: scsi = "FAST-320"; break; + case 8: scsi = "FAST-160"; break; + case 9: scsi = "FAST-80"; break; + case 10: + case 11: scsi = "FAST-40"; break; + case 12: scsi = "FAST-20"; break; + } + } else { + picosec = tp->period * 4000; + if (tp->period < 25) + scsi = "FAST-20"; + else if (tp->period < 50) + scsi = "FAST-10"; + else + scsi = "FAST-5"; + } + + kb100 = (10000000 + picosec / 2) / picosec; + if (tp->width) + kb100 *= 2; + sprint_frac(tmp, picosec, 1000); + + dev_info(&starget->dev, + "%s %sSCSI %d.%d MB/s %s%s%s (%s ns, offset %d)\n", + scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10, + tp->dt ? "DT" : "ST", tp->iu ? " IU" : "", + tp->qas ? " QAS" : "", tmp, tp->offset); + } else { + dev_info(&starget->dev, "%sasynchronous.\n", + tp->width ? "wide " : ""); + } +} +EXPORT_SYMBOL(spi_display_xfer_agreement); + +#define SETUP_ATTRIBUTE(field) \ + i->private_attrs[count] = class_device_attr_##field; \ + if (!i->f->set_##field) { \ + i->private_attrs[count].attr.mode = S_IRUGO; \ + i->private_attrs[count].store = NULL; \ + } \ + i->attrs[count] = &i->private_attrs[count]; \ + if (i->f->show_##field) \ + count++ + +#define SETUP_HOST_ATTRIBUTE(field) \ + i->private_host_attrs[count] = class_device_attr_##field; \ + if (!i->f->set_##field) { \ + i->private_host_attrs[count].attr.mode = S_IRUGO; \ + i->private_host_attrs[count].store = NULL; \ + } \ + i->host_attrs[count] = &i->private_host_attrs[count]; \ + count++ + +static int spi_device_match(struct attribute_container *cont, + struct device *dev) +{ + struct scsi_device *sdev; + struct Scsi_Host *shost; + + if (!scsi_is_sdev_device(dev)) + return 0; + + sdev = to_scsi_device(dev); + shost = sdev->host; + if (!shost->transportt || shost->transportt->host_attrs.ac.class + != &spi_host_class.class) + return 0; + /* Note: this class has no device attributes, so it has + * no per-HBA allocation and thus we don't need to distinguish + * the attribute containers for the device */ + return 1; +} + +static int spi_target_match(struct attribute_container *cont, + struct device *dev) +{ + struct Scsi_Host *shost; + struct spi_internal *i; + + if (!scsi_is_target_device(dev)) + return 0; + + shost = dev_to_shost(dev->parent); + if (!shost->transportt || shost->transportt->host_attrs.ac.class + != &spi_host_class.class) + return 0; + + i = to_spi_internal(shost->transportt); + + return &i->t.target_attrs.ac == cont; +} + +static DECLARE_TRANSPORT_CLASS(spi_transport_class, + "spi_transport", + spi_setup_transport_attrs, + NULL, + NULL); + +static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class, + spi_device_match, + spi_device_configure); + +struct scsi_transport_template * +spi_attach_transport(struct spi_function_template *ft) +{ + struct spi_internal *i = kmalloc(sizeof(struct spi_internal), + GFP_KERNEL); + int count = 0; + if (unlikely(!i)) + return NULL; + + memset(i, 0, sizeof(struct spi_internal)); + + + i->t.target_attrs.ac.class = &spi_transport_class.class; + i->t.target_attrs.ac.attrs = &i->attrs[0]; + i->t.target_attrs.ac.match = spi_target_match; + transport_container_register(&i->t.target_attrs); + i->t.target_size = sizeof(struct spi_transport_attrs); + i->t.host_attrs.ac.class = &spi_host_class.class; + i->t.host_attrs.ac.attrs = &i->host_attrs[0]; + i->t.host_attrs.ac.match = spi_host_match; + transport_container_register(&i->t.host_attrs); + i->t.host_size = sizeof(struct spi_host_attrs); + i->f = ft; + + SETUP_ATTRIBUTE(period); + SETUP_ATTRIBUTE(offset); + SETUP_ATTRIBUTE(width); + SETUP_ATTRIBUTE(iu); + SETUP_ATTRIBUTE(dt); + SETUP_ATTRIBUTE(qas); + SETUP_ATTRIBUTE(wr_flow); + SETUP_ATTRIBUTE(rd_strm); + SETUP_ATTRIBUTE(rti); + SETUP_ATTRIBUTE(pcomp_en); + + /* if you add an attribute but forget to increase SPI_NUM_ATTRS + * this bug will trigger */ + BUG_ON(count > SPI_NUM_ATTRS); + + i->attrs[count++] = &class_device_attr_revalidate; + + i->attrs[count] = NULL; + + count = 0; + SETUP_HOST_ATTRIBUTE(signalling); + + BUG_ON(count > SPI_HOST_ATTRS); + + i->host_attrs[count] = NULL; + + return &i->t; +} +EXPORT_SYMBOL(spi_attach_transport); + +void spi_release_transport(struct scsi_transport_template *t) +{ + struct spi_internal *i = to_spi_internal(t); + + transport_container_unregister(&i->t.target_attrs); + transport_container_unregister(&i->t.host_attrs); + + kfree(i); +} +EXPORT_SYMBOL(spi_release_transport); + +static __init int spi_transport_init(void) +{ + int error = transport_class_register(&spi_transport_class); + if (error) + return error; + error = anon_transport_class_register(&spi_device_class); + return transport_class_register(&spi_host_class); +} + +static void __exit spi_transport_exit(void) +{ + transport_class_unregister(&spi_transport_class); + anon_transport_class_unregister(&spi_device_class); + transport_class_unregister(&spi_host_class); +} + +MODULE_AUTHOR("Martin Hicks"); +MODULE_DESCRIPTION("SPI Transport Attributes"); +MODULE_LICENSE("GPL"); + +module_init(spi_transport_init); +module_exit(spi_transport_exit); |