Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c
new file mode 100644
index 0000000..303d765
--- /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);