![James Bottomley](/assets/img/avatar_default.png)
The class_device->device conversion is causing an oops in revalidate because it's assuming that the device_for_each_child iterator will only return struct scsi_device children. The conversion made all former class_devices children of the device as well, so this assumption is broken. Fix it. Cc: Stable Tree <stable@kernel.org> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
1533 lines
41 KiB
C
1533 lines
41 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 <linux/blkdev.h>
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#include <linux/mutex.h>
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#include <linux/sysfs.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_cmnd.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_NUM_ATTRS 14 /* 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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#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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/* Private data accessors (keep these out of the header file) */
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#define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
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#define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
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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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};
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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 int spi_execute(struct scsi_device *sdev, const void *cmd,
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enum dma_data_direction dir,
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void *buffer, unsigned bufflen,
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struct scsi_sense_hdr *sshdr)
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{
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int i, result;
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unsigned char sense[SCSI_SENSE_BUFFERSIZE];
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for(i = 0; i < DV_RETRIES; i++) {
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result = scsi_execute(sdev, cmd, dir, buffer, bufflen,
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sense, DV_TIMEOUT, /* retries */ 1,
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REQ_FAILFAST);
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if (result & DRIVER_SENSE) {
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struct scsi_sense_hdr sshdr_tmp;
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if (!sshdr)
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sshdr = &sshdr_tmp;
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if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE,
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sshdr)
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&& sshdr->sense_key == UNIT_ATTENTION)
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continue;
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}
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break;
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}
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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 < ARRAY_SIZE(signal_types); 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 < ARRAY_SIZE(signal_types); 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 transport_container *tc, struct device *dev,
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struct device *cdev)
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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 int spi_host_configure(struct transport_container *tc,
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struct device *dev,
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struct device *cdev);
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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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spi_host_configure);
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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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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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return &shost->transportt->host_attrs.ac == cont;
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}
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static int spi_target_configure(struct transport_container *tc,
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struct device *dev,
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struct device *cdev);
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static int spi_device_configure(struct transport_container *tc,
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struct device *dev,
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struct device *cdev)
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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 transport_container *tc,
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struct device *dev,
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struct device *cdev)
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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_min_period(starget) = 0;
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spi_offset(starget) = 0; /* async */
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spi_max_offset(starget) = 255;
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spi_width(starget) = 0; /* narrow */
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spi_max_width(starget) = 1;
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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_hold_mcs(starget) = 0;
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spi_dv_pending(starget) = 0;
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spi_dv_in_progress(starget) = 0;
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spi_initial_dv(starget) = 0;
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mutex_init(&spi_dv_mutex(starget));
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return 0;
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}
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#define spi_transport_show_simple(field, format_string) \
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\
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static ssize_t \
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show_spi_transport_##field(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct scsi_target *starget = transport_class_to_starget(dev); \
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struct spi_transport_attrs *tp; \
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\
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tp = (struct spi_transport_attrs *)&starget->starget_data; \
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return snprintf(buf, 20, format_string, tp->field); \
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}
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#define spi_transport_store_simple(field, format_string) \
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\
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static ssize_t \
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store_spi_transport_##field(struct device *dev, \
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struct device_attribute *attr, \
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const char *buf, 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(dev); \
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struct spi_transport_attrs *tp; \
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\
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tp = (struct spi_transport_attrs *)&starget->starget_data; \
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val = simple_strtoul(buf, NULL, 0); \
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tp->field = val; \
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return count; \
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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 device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct scsi_target *starget = transport_class_to_starget(dev); \
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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 device *dev, \
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struct device_attribute *attr, \
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const char *buf, 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(dev); \
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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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if (!i->f->set_##field) \
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return -EINVAL; \
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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_store_max(field, format_string) \
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static ssize_t \
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store_spi_transport_##field(struct device *dev, \
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struct device_attribute *attr, \
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const char *buf, 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(dev); \
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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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struct spi_transport_attrs *tp \
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= (struct spi_transport_attrs *)&starget->starget_data; \
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\
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if (i->f->set_##field) \
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return -EINVAL; \
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val = simple_strtoul(buf, NULL, 0); \
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if (val > tp->max_##field) \
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val = tp->max_##field; \
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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 DEVICE_ATTR(field, S_IRUGO, \
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show_spi_transport_##field, \
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store_spi_transport_##field);
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#define spi_transport_simple_attr(field, format_string) \
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spi_transport_show_simple(field, format_string) \
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spi_transport_store_simple(field, format_string) \
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static DEVICE_ATTR(field, S_IRUGO, \
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show_spi_transport_##field, \
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store_spi_transport_##field);
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#define spi_transport_max_attr(field, format_string) \
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spi_transport_show_function(field, format_string) \
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spi_transport_store_max(field, format_string) \
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spi_transport_simple_attr(max_##field, format_string) \
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static DEVICE_ATTR(field, S_IRUGO, \
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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_max_attr(offset, "%d\n");
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spi_transport_max_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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spi_transport_rd_attr(hold_mcs, "%d\n");
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/* we only care about the first child device that's a real SCSI device
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* so we return 1 to terminate the iteration when we find it */
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static int child_iter(struct device *dev, void *data)
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{
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if (!scsi_is_sdev_device(dev))
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return 0;
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spi_dv_device(to_scsi_device(dev));
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return 1;
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}
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static ssize_t
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store_spi_revalidate(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct scsi_target *starget = transport_class_to_starget(dev);
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device_for_each_child(&starget->dev, NULL, child_iter);
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return count;
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}
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static 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 int period_to_str(char *buf, int period)
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{
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int len, picosec;
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if (period < 0 || period > 0xff) {
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picosec = -1;
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} else if (period <= SPI_STATIC_PPR) {
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picosec = ppr_to_ps[period];
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} else {
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picosec = 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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return len;
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}
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static ssize_t
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show_spi_transport_period_helper(char *buf, int period)
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{
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int len = period_to_str(buf, period);
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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_helper(struct device *dev, const char *buf,
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size_t count, int *periodp)
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{
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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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*periodp = period;
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return count;
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}
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static ssize_t
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show_spi_transport_period(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct scsi_target *starget = transport_class_to_starget(dev);
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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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struct spi_transport_attrs *tp =
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(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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return show_spi_transport_period_helper(buf, tp->period);
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}
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static ssize_t
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store_spi_transport_period(struct device *cdev, struct device_attribute *attr,
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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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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
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struct spi_internal *i = to_spi_internal(shost->transportt);
|
|
struct spi_transport_attrs *tp =
|
|
(struct spi_transport_attrs *)&starget->starget_data;
|
|
int period, retval;
|
|
|
|
if (!i->f->set_period)
|
|
return -EINVAL;
|
|
|
|
retval = store_spi_transport_period_helper(cdev, buf, count, &period);
|
|
|
|
if (period < tp->min_period)
|
|
period = tp->min_period;
|
|
|
|
i->f->set_period(starget, period);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static DEVICE_ATTR(period, S_IRUGO,
|
|
show_spi_transport_period,
|
|
store_spi_transport_period);
|
|
|
|
static ssize_t
|
|
show_spi_transport_min_period(struct device *cdev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
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);
|
|
struct spi_transport_attrs *tp =
|
|
(struct spi_transport_attrs *)&starget->starget_data;
|
|
|
|
if (!i->f->set_period)
|
|
return -EINVAL;
|
|
|
|
return show_spi_transport_period_helper(buf, tp->min_period);
|
|
}
|
|
|
|
static ssize_t
|
|
store_spi_transport_min_period(struct device *cdev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct scsi_target *starget = transport_class_to_starget(cdev);
|
|
struct spi_transport_attrs *tp =
|
|
(struct spi_transport_attrs *)&starget->starget_data;
|
|
|
|
return store_spi_transport_period_helper(cdev, buf, count,
|
|
&tp->min_period);
|
|
}
|
|
|
|
|
|
static DEVICE_ATTR(min_period, S_IRUGO,
|
|
show_spi_transport_min_period,
|
|
store_spi_transport_min_period);
|
|
|
|
|
|
static ssize_t show_spi_host_signalling(struct device *cdev,
|
|
struct device_attribute *attr,
|
|
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 device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct Scsi_Host *shost = transport_class_to_shost(dev);
|
|
struct spi_internal *i = to_spi_internal(shost->transportt);
|
|
enum spi_signal_type type = spi_signal_to_value(buf);
|
|
|
|
if (!i->f->set_signalling)
|
|
return -EINVAL;
|
|
|
|
if (type != SPI_SIGNAL_UNKNOWN)
|
|
i->f->set_signalling(shost, type);
|
|
|
|
return count;
|
|
}
|
|
static DEVICE_ATTR(signalling, S_IRUGO,
|
|
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)
|
|
|
|
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_device *sdev, u8 *buffer,
|
|
u8 *ptr, const int retries)
|
|
{
|
|
int len = ptr - buffer;
|
|
int j, k, r, result;
|
|
unsigned int pattern = 0x0000ffff;
|
|
struct scsi_sense_hdr sshdr;
|
|
|
|
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++) {
|
|
result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
|
|
buffer, len, &sshdr);
|
|
if(result || !scsi_device_online(sdev)) {
|
|
|
|
scsi_device_set_state(sdev, SDEV_QUIESCE);
|
|
if (scsi_sense_valid(&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;
|
|
|
|
|
|
sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
|
|
return SPI_COMPARE_FAILURE;
|
|
}
|
|
|
|
memset(ptr, 0, len);
|
|
spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
|
|
ptr, len, NULL);
|
|
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_device *sdev, u8 *buffer,
|
|
u8 *ptr, const int retries)
|
|
{
|
|
int r, result;
|
|
const int len = sdev->inquiry_len;
|
|
const char spi_inquiry[] = {
|
|
INQUIRY, 0, 0, 0, len, 0
|
|
};
|
|
|
|
for (r = 0; r < retries; r++) {
|
|
memset(ptr, 0, len);
|
|
|
|
result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
|
|
ptr, len, NULL);
|
|
|
|
if(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_device *sdev, u8 *buffer, u8 *ptr,
|
|
enum spi_compare_returns
|
|
(*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
|
|
{
|
|
struct spi_internal *i = to_spi_internal(sdev->host->transportt);
|
|
struct scsi_target *starget = sdev->sdev_target;
|
|
int period = 0, prevperiod = 0;
|
|
enum spi_compare_returns retval;
|
|
|
|
|
|
for (;;) {
|
|
int newperiod;
|
|
retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
|
|
|
|
if (retval == SPI_COMPARE_SUCCESS
|
|
|| retval == SPI_COMPARE_SKIP_TEST)
|
|
break;
|
|
|
|
/* OK, retrain, fallback */
|
|
if (i->f->get_iu)
|
|
i->f->get_iu(starget);
|
|
if (i->f->get_qas)
|
|
i->f->get_qas(starget);
|
|
if (i->f->get_period)
|
|
i->f->get_period(sdev->sdev_target);
|
|
|
|
/* Here's the fallback sequence; first try turning off
|
|
* IU, then QAS (if we can control them), then finally
|
|
* fall down the periods */
|
|
if (i->f->set_iu && spi_iu(starget)) {
|
|
starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
|
|
DV_SET(iu, 0);
|
|
} else if (i->f->set_qas && spi_qas(starget)) {
|
|
starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
|
|
DV_SET(qas, 0);
|
|
} else {
|
|
newperiod = spi_period(starget);
|
|
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 */
|
|
starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
|
|
DV_SET(offset, 0);
|
|
return SPI_COMPARE_FAILURE;
|
|
}
|
|
starget_printk(KERN_ERR, starget, "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_device *sdev, u8 *buffer)
|
|
{
|
|
int l, result;
|
|
|
|
/* 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
|
|
};
|
|
|
|
|
|
/* 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++) {
|
|
result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE,
|
|
NULL, 0, NULL);
|
|
|
|
if(result) {
|
|
if(l >= 3)
|
|
return 0;
|
|
} else {
|
|
/* TUR succeeded */
|
|
break;
|
|
}
|
|
}
|
|
|
|
result = spi_execute(sdev, spi_read_buffer_descriptor,
|
|
DMA_FROM_DEVICE, buffer, 4, NULL);
|
|
|
|
if (result)
|
|
/* Device has no echo buffer */
|
|
return 0;
|
|
|
|
return buffer[3] + ((buffer[2] & 0x1f) << 8);
|
|
}
|
|
|
|
static void
|
|
spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
|
|
{
|
|
struct spi_internal *i = to_spi_internal(sdev->host->transportt);
|
|
struct scsi_target *starget = sdev->sdev_target;
|
|
struct Scsi_Host *shost = sdev->host;
|
|
int len = sdev->inquiry_len;
|
|
int min_period = spi_min_period(starget);
|
|
int max_width = spi_max_width(starget);
|
|
/* first set us up for narrow async */
|
|
DV_SET(offset, 0);
|
|
DV_SET(width, 0);
|
|
|
|
if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
|
|
!= SPI_COMPARE_SUCCESS) {
|
|
starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
|
|
/* FIXME: should probably offline the device here? */
|
|
return;
|
|
}
|
|
|
|
if (!scsi_device_wide(sdev)) {
|
|
spi_max_width(starget) = 0;
|
|
max_width = 0;
|
|
}
|
|
|
|
/* test width */
|
|
if (i->f->set_width && max_width) {
|
|
i->f->set_width(starget, 1);
|
|
|
|
if (spi_dv_device_compare_inquiry(sdev, buffer,
|
|
buffer + len,
|
|
DV_LOOPS)
|
|
!= SPI_COMPARE_SUCCESS) {
|
|
starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
|
|
i->f->set_width(starget, 0);
|
|
/* Make sure we don't force wide back on by asking
|
|
* for a transfer period that requires it */
|
|
max_width = 0;
|
|
if (min_period < 10)
|
|
min_period = 10;
|
|
}
|
|
}
|
|
|
|
if (!i->f->set_period)
|
|
return;
|
|
|
|
/* device can't handle synchronous */
|
|
if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev))
|
|
return;
|
|
|
|
/* len == -1 is the signal that we need to ascertain the
|
|
* presence of an echo buffer before trying to use it. len ==
|
|
* 0 means we don't have an echo buffer */
|
|
len = -1;
|
|
|
|
retry:
|
|
|
|
/* now set up to the maximum */
|
|
DV_SET(offset, spi_max_offset(starget));
|
|
DV_SET(period, min_period);
|
|
|
|
/* try QAS requests; this should be harmless to set if the
|
|
* target supports it */
|
|
if (scsi_device_qas(sdev)) {
|
|
DV_SET(qas, 1);
|
|
} else {
|
|
DV_SET(qas, 0);
|
|
}
|
|
|
|
if (scsi_device_ius(sdev) && min_period < 9) {
|
|
/* This u320 (or u640). Set IU transfers */
|
|
DV_SET(iu, 1);
|
|
/* Then set the optional parameters */
|
|
DV_SET(rd_strm, 1);
|
|
DV_SET(wr_flow, 1);
|
|
DV_SET(rti, 1);
|
|
if (min_period == 8)
|
|
DV_SET(pcomp_en, 1);
|
|
} else {
|
|
DV_SET(iu, 0);
|
|
}
|
|
|
|
/* now that we've done all this, actually check the bus
|
|
* signal type (if known). Some devices are stupid on
|
|
* a SE bus and still claim they can try LVD only settings */
|
|
if (i->f->get_signalling)
|
|
i->f->get_signalling(shost);
|
|
if (spi_signalling(shost) == SPI_SIGNAL_SE ||
|
|
spi_signalling(shost) == SPI_SIGNAL_HVD ||
|
|
!scsi_device_dt(sdev)) {
|
|
DV_SET(dt, 0);
|
|
} else {
|
|
DV_SET(dt, 1);
|
|
}
|
|
/* set width last because it will pull all the other
|
|
* parameters down to required values */
|
|
DV_SET(width, max_width);
|
|
|
|
/* Do the read only INQUIRY tests */
|
|
spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
|
|
spi_dv_device_compare_inquiry);
|
|
/* See if we actually managed to negotiate and sustain DT */
|
|
if (i->f->get_dt)
|
|
i->f->get_dt(starget);
|
|
|
|
/* see if the device has an echo buffer. If it does we can do
|
|
* the SPI pattern write tests. Because of some broken
|
|
* devices, we *only* try this on a device that has actually
|
|
* negotiated DT */
|
|
|
|
if (len == -1 && spi_dt(starget))
|
|
len = spi_dv_device_get_echo_buffer(sdev, buffer);
|
|
|
|
if (len <= 0) {
|
|
starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
|
|
return;
|
|
}
|
|
|
|
if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
|
|
starget_printk(KERN_WARNING, starget, "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(sdev, 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_target *starget = sdev->sdev_target;
|
|
u8 *buffer;
|
|
const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
|
|
|
|
if (unlikely(scsi_device_get(sdev)))
|
|
return;
|
|
|
|
if (unlikely(spi_dv_in_progress(starget)))
|
|
return;
|
|
spi_dv_in_progress(starget) = 1;
|
|
|
|
buffer = kzalloc(len, GFP_KERNEL);
|
|
|
|
if (unlikely(!buffer))
|
|
goto out_put;
|
|
|
|
/* 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;
|
|
mutex_lock(&spi_dv_mutex(starget));
|
|
|
|
starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
|
|
|
|
spi_dv_device_internal(sdev, buffer);
|
|
|
|
starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
|
|
|
|
mutex_unlock(&spi_dv_mutex(starget));
|
|
spi_dv_pending(starget) = 0;
|
|
|
|
scsi_target_resume(starget);
|
|
|
|
spi_initial_dv(starget) = 1;
|
|
|
|
out_free:
|
|
kfree(buffer);
|
|
out_put:
|
|
spi_dv_in_progress(starget) = 0;
|
|
scsi_device_put(sdev);
|
|
}
|
|
EXPORT_SYMBOL(spi_dv_device);
|
|
|
|
struct work_queue_wrapper {
|
|
struct work_struct work;
|
|
struct scsi_device *sdev;
|
|
};
|
|
|
|
static void
|
|
spi_dv_device_work_wrapper(struct work_struct *work)
|
|
{
|
|
struct work_queue_wrapper *wqw =
|
|
container_of(work, struct work_queue_wrapper, work);
|
|
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->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%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" : "",
|
|
tp->rd_strm ? " RDSTRM" : "",
|
|
tp->rti ? " RTI" : "",
|
|
tp->wr_flow ? " WRFLOW" : "",
|
|
tp->pcomp_en ? " PCOMP" : "",
|
|
tp->hold_mcs ? " HMCS" : "",
|
|
tmp, tp->offset);
|
|
} else {
|
|
dev_info(&starget->dev, "%sasynchronous\n",
|
|
tp->width ? "wide " : "");
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(spi_display_xfer_agreement);
|
|
|
|
int spi_populate_width_msg(unsigned char *msg, int width)
|
|
{
|
|
msg[0] = EXTENDED_MESSAGE;
|
|
msg[1] = 2;
|
|
msg[2] = EXTENDED_WDTR;
|
|
msg[3] = width;
|
|
return 4;
|
|
}
|
|
EXPORT_SYMBOL_GPL(spi_populate_width_msg);
|
|
|
|
int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
|
|
{
|
|
msg[0] = EXTENDED_MESSAGE;
|
|
msg[1] = 3;
|
|
msg[2] = EXTENDED_SDTR;
|
|
msg[3] = period;
|
|
msg[4] = offset;
|
|
return 5;
|
|
}
|
|
EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
|
|
|
|
int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
|
|
int width, int options)
|
|
{
|
|
msg[0] = EXTENDED_MESSAGE;
|
|
msg[1] = 6;
|
|
msg[2] = EXTENDED_PPR;
|
|
msg[3] = period;
|
|
msg[4] = 0;
|
|
msg[5] = offset;
|
|
msg[6] = width;
|
|
msg[7] = options;
|
|
return 8;
|
|
}
|
|
EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
|
|
|
|
#ifdef CONFIG_SCSI_CONSTANTS
|
|
static const char * const one_byte_msgs[] = {
|
|
/* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
|
|
/* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error",
|
|
/* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
|
|
/* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
|
|
/* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set",
|
|
/* 0x0f */ "Initiate Recovery", "Release Recovery",
|
|
/* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
|
|
/* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
|
|
};
|
|
|
|
static const char * const two_byte_msgs[] = {
|
|
/* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
|
|
/* 0x23 */ "Ignore Wide Residue", "ACA"
|
|
};
|
|
|
|
static const char * const extended_msgs[] = {
|
|
/* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
|
|
/* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
|
|
/* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
|
|
};
|
|
|
|
static void print_nego(const unsigned char *msg, int per, int off, int width)
|
|
{
|
|
if (per) {
|
|
char buf[20];
|
|
period_to_str(buf, msg[per]);
|
|
printk("period = %s ns ", buf);
|
|
}
|
|
|
|
if (off)
|
|
printk("offset = %d ", msg[off]);
|
|
if (width)
|
|
printk("width = %d ", 8 << msg[width]);
|
|
}
|
|
|
|
static void print_ptr(const unsigned char *msg, int msb, const char *desc)
|
|
{
|
|
int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
|
|
msg[msb+3];
|
|
printk("%s = %d ", desc, ptr);
|
|
}
|
|
|
|
int spi_print_msg(const unsigned char *msg)
|
|
{
|
|
int len = 1, i;
|
|
if (msg[0] == EXTENDED_MESSAGE) {
|
|
len = 2 + msg[1];
|
|
if (len == 2)
|
|
len += 256;
|
|
if (msg[2] < ARRAY_SIZE(extended_msgs))
|
|
printk ("%s ", extended_msgs[msg[2]]);
|
|
else
|
|
printk ("Extended Message, reserved code (0x%02x) ",
|
|
(int) msg[2]);
|
|
switch (msg[2]) {
|
|
case EXTENDED_MODIFY_DATA_POINTER:
|
|
print_ptr(msg, 3, "pointer");
|
|
break;
|
|
case EXTENDED_SDTR:
|
|
print_nego(msg, 3, 4, 0);
|
|
break;
|
|
case EXTENDED_WDTR:
|
|
print_nego(msg, 0, 0, 3);
|
|
break;
|
|
case EXTENDED_PPR:
|
|
print_nego(msg, 3, 5, 6);
|
|
break;
|
|
case EXTENDED_MODIFY_BIDI_DATA_PTR:
|
|
print_ptr(msg, 3, "out");
|
|
print_ptr(msg, 7, "in");
|
|
break;
|
|
default:
|
|
for (i = 2; i < len; ++i)
|
|
printk("%02x ", msg[i]);
|
|
}
|
|
/* Identify */
|
|
} else if (msg[0] & 0x80) {
|
|
printk("Identify disconnect %sallowed %s %d ",
|
|
(msg[0] & 0x40) ? "" : "not ",
|
|
(msg[0] & 0x20) ? "target routine" : "lun",
|
|
msg[0] & 0x7);
|
|
/* Normal One byte */
|
|
} else if (msg[0] < 0x1f) {
|
|
if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
|
|
printk("%s ", one_byte_msgs[msg[0]]);
|
|
else
|
|
printk("reserved (%02x) ", msg[0]);
|
|
} else if (msg[0] == 0x55) {
|
|
printk("QAS Request ");
|
|
/* Two byte */
|
|
} else if (msg[0] <= 0x2f) {
|
|
if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
|
|
printk("%s %02x ", two_byte_msgs[msg[0] - 0x20],
|
|
msg[1]);
|
|
else
|
|
printk("reserved two byte (%02x %02x) ",
|
|
msg[0], msg[1]);
|
|
len = 2;
|
|
} else
|
|
printk("reserved ");
|
|
return len;
|
|
}
|
|
EXPORT_SYMBOL(spi_print_msg);
|
|
|
|
#else /* ifndef CONFIG_SCSI_CONSTANTS */
|
|
|
|
int spi_print_msg(const unsigned char *msg)
|
|
{
|
|
int len = 1, i;
|
|
|
|
if (msg[0] == EXTENDED_MESSAGE) {
|
|
len = 2 + msg[1];
|
|
if (len == 2)
|
|
len += 256;
|
|
for (i = 0; i < len; ++i)
|
|
printk("%02x ", msg[i]);
|
|
/* Identify */
|
|
} else if (msg[0] & 0x80) {
|
|
printk("%02x ", msg[0]);
|
|
/* Normal One byte */
|
|
} else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
|
|
printk("%02x ", msg[0]);
|
|
/* Two byte */
|
|
} else if (msg[0] <= 0x2f) {
|
|
printk("%02x %02x", msg[0], msg[1]);
|
|
len = 2;
|
|
} else
|
|
printk("%02x ", msg[0]);
|
|
return len;
|
|
}
|
|
EXPORT_SYMBOL(spi_print_msg);
|
|
#endif /* ! CONFIG_SCSI_CONSTANTS */
|
|
|
|
static int spi_device_match(struct attribute_container *cont,
|
|
struct device *dev)
|
|
{
|
|
struct scsi_device *sdev;
|
|
struct Scsi_Host *shost;
|
|
struct spi_internal *i;
|
|
|
|
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 */
|
|
i = to_spi_internal(shost->transportt);
|
|
if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int spi_target_match(struct attribute_container *cont,
|
|
struct device *dev)
|
|
{
|
|
struct Scsi_Host *shost;
|
|
struct scsi_target *starget;
|
|
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);
|
|
starget = to_scsi_target(dev);
|
|
|
|
if (i->f->deny_binding && i->f->deny_binding(starget))
|
|
return 0;
|
|
|
|
return &i->t.target_attrs.ac == cont;
|
|
}
|
|
|
|
static DECLARE_TRANSPORT_CLASS(spi_transport_class,
|
|
"spi_transport",
|
|
spi_setup_transport_attrs,
|
|
NULL,
|
|
spi_target_configure);
|
|
|
|
static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
|
|
spi_device_match,
|
|
spi_device_configure);
|
|
|
|
static struct attribute *host_attributes[] = {
|
|
&dev_attr_signalling.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group host_attribute_group = {
|
|
.attrs = host_attributes,
|
|
};
|
|
|
|
static int spi_host_configure(struct transport_container *tc,
|
|
struct device *dev,
|
|
struct device *cdev)
|
|
{
|
|
struct kobject *kobj = &cdev->kobj;
|
|
struct Scsi_Host *shost = transport_class_to_shost(cdev);
|
|
struct spi_internal *si = to_spi_internal(shost->transportt);
|
|
struct attribute *attr = &dev_attr_signalling.attr;
|
|
int rc = 0;
|
|
|
|
if (si->f->set_signalling)
|
|
rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* returns true if we should be showing the variable. Also
|
|
* overloads the return by setting 1<<1 if the attribute should
|
|
* be writeable */
|
|
#define TARGET_ATTRIBUTE_HELPER(name) \
|
|
(si->f->show_##name ? S_IRUGO : 0) | \
|
|
(si->f->set_##name ? S_IWUSR : 0)
|
|
|
|
static mode_t target_attribute_is_visible(struct kobject *kobj,
|
|
struct attribute *attr, int i)
|
|
{
|
|
struct device *cdev = container_of(kobj, struct device, kobj);
|
|
struct scsi_target *starget = transport_class_to_starget(cdev);
|
|
struct Scsi_Host *shost = transport_class_to_shost(cdev);
|
|
struct spi_internal *si = to_spi_internal(shost->transportt);
|
|
|
|
if (attr == &dev_attr_period.attr &&
|
|
spi_support_sync(starget))
|
|
return TARGET_ATTRIBUTE_HELPER(period);
|
|
else if (attr == &dev_attr_min_period.attr &&
|
|
spi_support_sync(starget))
|
|
return TARGET_ATTRIBUTE_HELPER(period);
|
|
else if (attr == &dev_attr_offset.attr &&
|
|
spi_support_sync(starget))
|
|
return TARGET_ATTRIBUTE_HELPER(offset);
|
|
else if (attr == &dev_attr_max_offset.attr &&
|
|
spi_support_sync(starget))
|
|
return TARGET_ATTRIBUTE_HELPER(offset);
|
|
else if (attr == &dev_attr_width.attr &&
|
|
spi_support_wide(starget))
|
|
return TARGET_ATTRIBUTE_HELPER(width);
|
|
else if (attr == &dev_attr_max_width.attr &&
|
|
spi_support_wide(starget))
|
|
return TARGET_ATTRIBUTE_HELPER(width);
|
|
else if (attr == &dev_attr_iu.attr &&
|
|
spi_support_ius(starget))
|
|
return TARGET_ATTRIBUTE_HELPER(iu);
|
|
else if (attr == &dev_attr_dt.attr &&
|
|
spi_support_dt(starget))
|
|
return TARGET_ATTRIBUTE_HELPER(dt);
|
|
else if (attr == &dev_attr_qas.attr &&
|
|
spi_support_qas(starget))
|
|
return TARGET_ATTRIBUTE_HELPER(qas);
|
|
else if (attr == &dev_attr_wr_flow.attr &&
|
|
spi_support_ius(starget))
|
|
return TARGET_ATTRIBUTE_HELPER(wr_flow);
|
|
else if (attr == &dev_attr_rd_strm.attr &&
|
|
spi_support_ius(starget))
|
|
return TARGET_ATTRIBUTE_HELPER(rd_strm);
|
|
else if (attr == &dev_attr_rti.attr &&
|
|
spi_support_ius(starget))
|
|
return TARGET_ATTRIBUTE_HELPER(rti);
|
|
else if (attr == &dev_attr_pcomp_en.attr &&
|
|
spi_support_ius(starget))
|
|
return TARGET_ATTRIBUTE_HELPER(pcomp_en);
|
|
else if (attr == &dev_attr_hold_mcs.attr &&
|
|
spi_support_ius(starget))
|
|
return TARGET_ATTRIBUTE_HELPER(hold_mcs);
|
|
else if (attr == &dev_attr_revalidate.attr)
|
|
return S_IWUSR;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct attribute *target_attributes[] = {
|
|
&dev_attr_period.attr,
|
|
&dev_attr_min_period.attr,
|
|
&dev_attr_offset.attr,
|
|
&dev_attr_max_offset.attr,
|
|
&dev_attr_width.attr,
|
|
&dev_attr_max_width.attr,
|
|
&dev_attr_iu.attr,
|
|
&dev_attr_dt.attr,
|
|
&dev_attr_qas.attr,
|
|
&dev_attr_wr_flow.attr,
|
|
&dev_attr_rd_strm.attr,
|
|
&dev_attr_rti.attr,
|
|
&dev_attr_pcomp_en.attr,
|
|
&dev_attr_hold_mcs.attr,
|
|
&dev_attr_revalidate.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group target_attribute_group = {
|
|
.attrs = target_attributes,
|
|
.is_visible = target_attribute_is_visible,
|
|
};
|
|
|
|
static int spi_target_configure(struct transport_container *tc,
|
|
struct device *dev,
|
|
struct device *cdev)
|
|
{
|
|
struct kobject *kobj = &cdev->kobj;
|
|
|
|
/* force an update based on parameters read from the device */
|
|
sysfs_update_group(kobj, &target_attribute_group);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct scsi_transport_template *
|
|
spi_attach_transport(struct spi_function_template *ft)
|
|
{
|
|
struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
|
|
GFP_KERNEL);
|
|
|
|
if (unlikely(!i))
|
|
return NULL;
|
|
|
|
i->t.target_attrs.ac.class = &spi_transport_class.class;
|
|
i->t.target_attrs.ac.grp = &target_attribute_group;
|
|
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.grp = &host_attribute_group;
|
|
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;
|
|
|
|
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);
|