![Linus Torvalds](/assets/img/avatar_default.png)
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!
1021 lines
27 KiB
C
1021 lines
27 KiB
C
/*
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* Parallel SCSI (SPI) transport specific attributes exported to sysfs.
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*
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* Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
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* Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/ctype.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/workqueue.h>
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#include <asm/semaphore.h>
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#include <scsi/scsi.h>
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#include "scsi_priv.h"
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_request.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_transport_spi.h>
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#define SPI_PRINTK(x, l, f, a...) dev_printk(l, &(x)->dev, f , ##a)
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#define SPI_NUM_ATTRS 10 /* increase this if you add attributes */
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#define SPI_OTHER_ATTRS 1 /* Increase this if you add "always
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* on" attributes */
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#define SPI_HOST_ATTRS 1
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#define SPI_MAX_ECHO_BUFFER_SIZE 4096
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/* Private data accessors (keep these out of the header file) */
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#define spi_dv_pending(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_pending)
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#define spi_dv_sem(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_sem)
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struct spi_internal {
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struct scsi_transport_template t;
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struct spi_function_template *f;
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/* The actual attributes */
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struct class_device_attribute private_attrs[SPI_NUM_ATTRS];
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/* The array of null terminated pointers to attributes
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* needed by scsi_sysfs.c */
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struct class_device_attribute *attrs[SPI_NUM_ATTRS + SPI_OTHER_ATTRS + 1];
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struct class_device_attribute private_host_attrs[SPI_HOST_ATTRS];
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struct class_device_attribute *host_attrs[SPI_HOST_ATTRS + 1];
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};
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#define to_spi_internal(tmpl) container_of(tmpl, struct spi_internal, t)
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static const int ppr_to_ps[] = {
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/* The PPR values 0-6 are reserved, fill them in when
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* the committee defines them */
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-1, /* 0x00 */
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-1, /* 0x01 */
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-1, /* 0x02 */
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-1, /* 0x03 */
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-1, /* 0x04 */
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-1, /* 0x05 */
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-1, /* 0x06 */
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3125, /* 0x07 */
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6250, /* 0x08 */
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12500, /* 0x09 */
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25000, /* 0x0a */
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30300, /* 0x0b */
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50000, /* 0x0c */
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};
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/* The PPR values at which you calculate the period in ns by multiplying
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* by 4 */
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#define SPI_STATIC_PPR 0x0c
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static int sprint_frac(char *dest, int value, int denom)
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{
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int frac = value % denom;
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int result = sprintf(dest, "%d", value / denom);
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if (frac == 0)
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return result;
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dest[result++] = '.';
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do {
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denom /= 10;
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sprintf(dest + result, "%d", frac / denom);
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result++;
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frac %= denom;
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} while (frac);
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dest[result++] = '\0';
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return result;
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}
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static struct {
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enum spi_signal_type value;
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char *name;
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} signal_types[] = {
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{ SPI_SIGNAL_UNKNOWN, "unknown" },
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{ SPI_SIGNAL_SE, "SE" },
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{ SPI_SIGNAL_LVD, "LVD" },
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{ SPI_SIGNAL_HVD, "HVD" },
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};
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static inline const char *spi_signal_to_string(enum spi_signal_type type)
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{
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int i;
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for (i = 0; i < sizeof(signal_types)/sizeof(signal_types[0]); i++) {
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if (type == signal_types[i].value)
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return signal_types[i].name;
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}
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return NULL;
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}
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static inline enum spi_signal_type spi_signal_to_value(const char *name)
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{
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int i, len;
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for (i = 0; i < sizeof(signal_types)/sizeof(signal_types[0]); i++) {
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len = strlen(signal_types[i].name);
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if (strncmp(name, signal_types[i].name, len) == 0 &&
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(name[len] == '\n' || name[len] == '\0'))
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return signal_types[i].value;
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}
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return SPI_SIGNAL_UNKNOWN;
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}
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static int spi_host_setup(struct device *dev)
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{
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struct Scsi_Host *shost = dev_to_shost(dev);
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spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
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return 0;
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}
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static DECLARE_TRANSPORT_CLASS(spi_host_class,
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"spi_host",
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spi_host_setup,
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NULL,
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NULL);
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static int spi_host_match(struct attribute_container *cont,
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struct device *dev)
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{
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struct Scsi_Host *shost;
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struct spi_internal *i;
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if (!scsi_is_host_device(dev))
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return 0;
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shost = dev_to_shost(dev);
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if (!shost->transportt || shost->transportt->host_attrs.ac.class
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!= &spi_host_class.class)
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return 0;
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i = to_spi_internal(shost->transportt);
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return &i->t.host_attrs.ac == cont;
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}
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static int spi_device_configure(struct device *dev)
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{
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struct scsi_device *sdev = to_scsi_device(dev);
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struct scsi_target *starget = sdev->sdev_target;
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/* Populate the target capability fields with the values
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* gleaned from the device inquiry */
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spi_support_sync(starget) = scsi_device_sync(sdev);
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spi_support_wide(starget) = scsi_device_wide(sdev);
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spi_support_dt(starget) = scsi_device_dt(sdev);
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spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
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spi_support_ius(starget) = scsi_device_ius(sdev);
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spi_support_qas(starget) = scsi_device_qas(sdev);
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return 0;
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}
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static int spi_setup_transport_attrs(struct device *dev)
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{
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struct scsi_target *starget = to_scsi_target(dev);
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spi_period(starget) = -1; /* illegal value */
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spi_offset(starget) = 0; /* async */
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spi_width(starget) = 0; /* narrow */
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spi_iu(starget) = 0; /* no IU */
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spi_dt(starget) = 0; /* ST */
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spi_qas(starget) = 0;
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spi_wr_flow(starget) = 0;
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spi_rd_strm(starget) = 0;
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spi_rti(starget) = 0;
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spi_pcomp_en(starget) = 0;
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spi_dv_pending(starget) = 0;
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spi_initial_dv(starget) = 0;
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init_MUTEX(&spi_dv_sem(starget));
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return 0;
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}
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#define spi_transport_show_function(field, format_string) \
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\
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static ssize_t \
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show_spi_transport_##field(struct class_device *cdev, char *buf) \
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{ \
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struct scsi_target *starget = transport_class_to_starget(cdev); \
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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
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struct spi_transport_attrs *tp; \
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struct spi_internal *i = to_spi_internal(shost->transportt); \
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tp = (struct spi_transport_attrs *)&starget->starget_data; \
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if (i->f->get_##field) \
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i->f->get_##field(starget); \
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return snprintf(buf, 20, format_string, tp->field); \
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}
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#define spi_transport_store_function(field, format_string) \
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static ssize_t \
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store_spi_transport_##field(struct class_device *cdev, const char *buf, \
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size_t count) \
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{ \
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int val; \
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struct scsi_target *starget = transport_class_to_starget(cdev); \
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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
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struct spi_internal *i = to_spi_internal(shost->transportt); \
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\
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val = simple_strtoul(buf, NULL, 0); \
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i->f->set_##field(starget, val); \
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return count; \
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}
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#define spi_transport_rd_attr(field, format_string) \
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spi_transport_show_function(field, format_string) \
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spi_transport_store_function(field, format_string) \
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static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \
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show_spi_transport_##field, \
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store_spi_transport_##field);
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/* The Parallel SCSI Tranport Attributes: */
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spi_transport_rd_attr(offset, "%d\n");
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spi_transport_rd_attr(width, "%d\n");
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spi_transport_rd_attr(iu, "%d\n");
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spi_transport_rd_attr(dt, "%d\n");
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spi_transport_rd_attr(qas, "%d\n");
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spi_transport_rd_attr(wr_flow, "%d\n");
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spi_transport_rd_attr(rd_strm, "%d\n");
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spi_transport_rd_attr(rti, "%d\n");
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spi_transport_rd_attr(pcomp_en, "%d\n");
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static ssize_t
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store_spi_revalidate(struct class_device *cdev, const char *buf, size_t count)
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{
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struct scsi_target *starget = transport_class_to_starget(cdev);
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/* FIXME: we're relying on an awful lot of device internals
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* here. We really need a function to get the first available
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* child */
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struct device *dev = container_of(starget->dev.children.next, struct device, node);
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struct scsi_device *sdev = to_scsi_device(dev);
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spi_dv_device(sdev);
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return count;
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}
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static CLASS_DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
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/* Translate the period into ns according to the current spec
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* for SDTR/PPR messages */
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static ssize_t show_spi_transport_period(struct class_device *cdev, char *buf)
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{
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struct scsi_target *starget = transport_class_to_starget(cdev);
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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
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struct spi_transport_attrs *tp;
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int len, picosec;
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struct spi_internal *i = to_spi_internal(shost->transportt);
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tp = (struct spi_transport_attrs *)&starget->starget_data;
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if (i->f->get_period)
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i->f->get_period(starget);
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if (tp->period < 0 || tp->period > 0xff) {
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picosec = -1;
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} else if (tp->period <= SPI_STATIC_PPR) {
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picosec = ppr_to_ps[tp->period];
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} else {
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picosec = tp->period * 4000;
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}
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if (picosec == -1) {
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len = sprintf(buf, "reserved");
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} else {
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len = sprint_frac(buf, picosec, 1000);
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}
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buf[len++] = '\n';
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buf[len] = '\0';
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return len;
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}
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static ssize_t
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store_spi_transport_period(struct class_device *cdev, const char *buf,
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size_t count)
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{
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struct scsi_target *starget = transport_class_to_starget(cdev);
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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
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struct spi_internal *i = to_spi_internal(shost->transportt);
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int j, picosec, period = -1;
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char *endp;
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picosec = simple_strtoul(buf, &endp, 10) * 1000;
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if (*endp == '.') {
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int mult = 100;
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do {
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endp++;
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if (!isdigit(*endp))
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break;
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picosec += (*endp - '0') * mult;
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mult /= 10;
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} while (mult > 0);
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}
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for (j = 0; j <= SPI_STATIC_PPR; j++) {
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if (ppr_to_ps[j] < picosec)
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continue;
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period = j;
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break;
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}
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if (period == -1)
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period = picosec / 4000;
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if (period > 0xff)
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period = 0xff;
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i->f->set_period(starget, period);
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return count;
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}
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static CLASS_DEVICE_ATTR(period, S_IRUGO | S_IWUSR,
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show_spi_transport_period,
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store_spi_transport_period);
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static ssize_t show_spi_host_signalling(struct class_device *cdev, char *buf)
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{
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struct Scsi_Host *shost = transport_class_to_shost(cdev);
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struct spi_internal *i = to_spi_internal(shost->transportt);
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if (i->f->get_signalling)
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i->f->get_signalling(shost);
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return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
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}
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static ssize_t store_spi_host_signalling(struct class_device *cdev,
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const char *buf, size_t count)
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{
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struct Scsi_Host *shost = transport_class_to_shost(cdev);
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struct spi_internal *i = to_spi_internal(shost->transportt);
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enum spi_signal_type type = spi_signal_to_value(buf);
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if (type != SPI_SIGNAL_UNKNOWN)
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i->f->set_signalling(shost, type);
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return count;
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}
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static CLASS_DEVICE_ATTR(signalling, S_IRUGO | S_IWUSR,
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show_spi_host_signalling,
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store_spi_host_signalling);
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#define DV_SET(x, y) \
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if(i->f->set_##x) \
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i->f->set_##x(sdev->sdev_target, y)
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#define DV_LOOPS 3
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#define DV_TIMEOUT (10*HZ)
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#define DV_RETRIES 3 /* should only need at most
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* two cc/ua clears */
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enum spi_compare_returns {
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SPI_COMPARE_SUCCESS,
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SPI_COMPARE_FAILURE,
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SPI_COMPARE_SKIP_TEST,
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};
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/* This is for read/write Domain Validation: If the device supports
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* an echo buffer, we do read/write tests to it */
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static enum spi_compare_returns
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spi_dv_device_echo_buffer(struct scsi_request *sreq, u8 *buffer,
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u8 *ptr, const int retries)
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{
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struct scsi_device *sdev = sreq->sr_device;
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int len = ptr - buffer;
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int j, k, r;
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unsigned int pattern = 0x0000ffff;
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const char spi_write_buffer[] = {
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WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
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};
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const char spi_read_buffer[] = {
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READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
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};
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/* set up the pattern buffer. Doesn't matter if we spill
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* slightly beyond since that's where the read buffer is */
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for (j = 0; j < len; ) {
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/* fill the buffer with counting (test a) */
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for ( ; j < min(len, 32); j++)
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buffer[j] = j;
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k = j;
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/* fill the buffer with alternating words of 0x0 and
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* 0xffff (test b) */
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for ( ; j < min(len, k + 32); j += 2) {
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u16 *word = (u16 *)&buffer[j];
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*word = (j & 0x02) ? 0x0000 : 0xffff;
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}
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k = j;
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/* fill with crosstalk (alternating 0x5555 0xaaa)
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* (test c) */
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for ( ; j < min(len, k + 32); j += 2) {
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u16 *word = (u16 *)&buffer[j];
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*word = (j & 0x02) ? 0x5555 : 0xaaaa;
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}
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k = j;
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/* fill with shifting bits (test d) */
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for ( ; j < min(len, k + 32); j += 4) {
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u32 *word = (unsigned int *)&buffer[j];
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u32 roll = (pattern & 0x80000000) ? 1 : 0;
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*word = pattern;
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pattern = (pattern << 1) | roll;
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}
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/* don't bother with random data (test e) */
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}
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for (r = 0; r < retries; r++) {
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sreq->sr_cmd_len = 0; /* wait_req to fill in */
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sreq->sr_data_direction = DMA_TO_DEVICE;
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scsi_wait_req(sreq, spi_write_buffer, buffer, len,
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DV_TIMEOUT, DV_RETRIES);
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if(sreq->sr_result || !scsi_device_online(sdev)) {
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struct scsi_sense_hdr sshdr;
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scsi_device_set_state(sdev, SDEV_QUIESCE);
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if (scsi_request_normalize_sense(sreq, &sshdr)
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&& sshdr.sense_key == ILLEGAL_REQUEST
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/* INVALID FIELD IN CDB */
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&& sshdr.asc == 0x24 && sshdr.ascq == 0x00)
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/* This would mean that the drive lied
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* to us about supporting an echo
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* buffer (unfortunately some Western
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* Digital drives do precisely this)
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*/
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return SPI_COMPARE_SKIP_TEST;
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SPI_PRINTK(sdev->sdev_target, KERN_ERR, "Write Buffer failure %x\n", sreq->sr_result);
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return SPI_COMPARE_FAILURE;
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}
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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);
|