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![Hannes Reinecke](/assets/img/avatar_default.png)
The scsi_device now has VPD page83 information attached, so there is no need to query it again. Signed-off-by: Hannes Reinecke <hare@suse.de> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
736 lines
17 KiB
C
736 lines
17 KiB
C
/*
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* SCSI Enclosure Services
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*
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* Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
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*
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**-----------------------------------------------------------------------------
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of the GNU General Public License
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** version 2 as published by the Free Software Foundation.
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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**
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**-----------------------------------------------------------------------------
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/enclosure.h>
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#include <asm/unaligned.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_driver.h>
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#include <scsi/scsi_host.h>
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struct ses_device {
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unsigned char *page1;
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unsigned char *page1_types;
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unsigned char *page2;
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unsigned char *page10;
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short page1_len;
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short page1_num_types;
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short page2_len;
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short page10_len;
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};
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struct ses_component {
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u64 addr;
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unsigned char *desc;
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};
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static int ses_probe(struct device *dev)
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{
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struct scsi_device *sdev = to_scsi_device(dev);
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int err = -ENODEV;
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if (sdev->type != TYPE_ENCLOSURE)
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goto out;
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err = 0;
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sdev_printk(KERN_NOTICE, sdev, "Attached Enclosure device\n");
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out:
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return err;
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}
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#define SES_TIMEOUT (30 * HZ)
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#define SES_RETRIES 3
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static int ses_recv_diag(struct scsi_device *sdev, int page_code,
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void *buf, int bufflen)
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{
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unsigned char cmd[] = {
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RECEIVE_DIAGNOSTIC,
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1, /* Set PCV bit */
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page_code,
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bufflen >> 8,
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bufflen & 0xff,
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0
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};
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return scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen,
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NULL, SES_TIMEOUT, SES_RETRIES, NULL);
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}
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static int ses_send_diag(struct scsi_device *sdev, int page_code,
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void *buf, int bufflen)
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{
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u32 result;
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unsigned char cmd[] = {
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SEND_DIAGNOSTIC,
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0x10, /* Set PF bit */
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0,
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bufflen >> 8,
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bufflen & 0xff,
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0
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};
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result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, buf, bufflen,
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NULL, SES_TIMEOUT, SES_RETRIES, NULL);
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if (result)
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sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n",
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result);
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return result;
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}
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static int ses_set_page2_descriptor(struct enclosure_device *edev,
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struct enclosure_component *ecomp,
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unsigned char *desc)
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{
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int i, j, count = 0, descriptor = ecomp->number;
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struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
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struct ses_device *ses_dev = edev->scratch;
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unsigned char *type_ptr = ses_dev->page1_types;
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unsigned char *desc_ptr = ses_dev->page2 + 8;
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/* Clear everything */
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memset(desc_ptr, 0, ses_dev->page2_len - 8);
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for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
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for (j = 0; j < type_ptr[1]; j++) {
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desc_ptr += 4;
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if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
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type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
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continue;
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if (count++ == descriptor) {
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memcpy(desc_ptr, desc, 4);
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/* set select */
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desc_ptr[0] |= 0x80;
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/* clear reserved, just in case */
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desc_ptr[0] &= 0xf0;
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}
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}
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}
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return ses_send_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
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}
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static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
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struct enclosure_component *ecomp)
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{
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int i, j, count = 0, descriptor = ecomp->number;
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struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
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struct ses_device *ses_dev = edev->scratch;
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unsigned char *type_ptr = ses_dev->page1_types;
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unsigned char *desc_ptr = ses_dev->page2 + 8;
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ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
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for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
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for (j = 0; j < type_ptr[1]; j++) {
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desc_ptr += 4;
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if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
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type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
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continue;
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if (count++ == descriptor)
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return desc_ptr;
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}
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}
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return NULL;
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}
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/* For device slot and array device slot elements, byte 3 bit 6
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* is "fault sensed" while byte 3 bit 5 is "fault reqstd". As this
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* code stands these bits are shifted 4 positions right so in
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* sysfs they will appear as bits 2 and 1 respectively. Strange. */
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static void ses_get_fault(struct enclosure_device *edev,
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struct enclosure_component *ecomp)
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{
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unsigned char *desc;
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desc = ses_get_page2_descriptor(edev, ecomp);
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if (desc)
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ecomp->fault = (desc[3] & 0x60) >> 4;
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}
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static int ses_set_fault(struct enclosure_device *edev,
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struct enclosure_component *ecomp,
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enum enclosure_component_setting val)
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{
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unsigned char desc[4] = {0 };
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switch (val) {
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case ENCLOSURE_SETTING_DISABLED:
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/* zero is disabled */
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break;
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case ENCLOSURE_SETTING_ENABLED:
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desc[3] = 0x20;
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break;
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default:
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/* SES doesn't do the SGPIO blink settings */
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return -EINVAL;
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}
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return ses_set_page2_descriptor(edev, ecomp, desc);
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}
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static void ses_get_status(struct enclosure_device *edev,
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struct enclosure_component *ecomp)
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{
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unsigned char *desc;
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desc = ses_get_page2_descriptor(edev, ecomp);
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if (desc)
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ecomp->status = (desc[0] & 0x0f);
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}
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static void ses_get_locate(struct enclosure_device *edev,
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struct enclosure_component *ecomp)
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{
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unsigned char *desc;
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desc = ses_get_page2_descriptor(edev, ecomp);
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if (desc)
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ecomp->locate = (desc[2] & 0x02) ? 1 : 0;
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}
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static int ses_set_locate(struct enclosure_device *edev,
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struct enclosure_component *ecomp,
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enum enclosure_component_setting val)
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{
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unsigned char desc[4] = {0 };
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switch (val) {
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case ENCLOSURE_SETTING_DISABLED:
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/* zero is disabled */
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break;
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case ENCLOSURE_SETTING_ENABLED:
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desc[2] = 0x02;
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break;
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default:
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/* SES doesn't do the SGPIO blink settings */
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return -EINVAL;
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}
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return ses_set_page2_descriptor(edev, ecomp, desc);
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}
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static int ses_set_active(struct enclosure_device *edev,
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struct enclosure_component *ecomp,
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enum enclosure_component_setting val)
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{
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unsigned char desc[4] = {0 };
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switch (val) {
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case ENCLOSURE_SETTING_DISABLED:
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/* zero is disabled */
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ecomp->active = 0;
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break;
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case ENCLOSURE_SETTING_ENABLED:
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desc[2] = 0x80;
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ecomp->active = 1;
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break;
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default:
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/* SES doesn't do the SGPIO blink settings */
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return -EINVAL;
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}
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return ses_set_page2_descriptor(edev, ecomp, desc);
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}
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static struct enclosure_component_callbacks ses_enclosure_callbacks = {
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.get_fault = ses_get_fault,
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.set_fault = ses_set_fault,
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.get_status = ses_get_status,
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.get_locate = ses_get_locate,
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.set_locate = ses_set_locate,
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.set_active = ses_set_active,
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};
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struct ses_host_edev {
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struct Scsi_Host *shost;
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struct enclosure_device *edev;
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};
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#if 0
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int ses_match_host(struct enclosure_device *edev, void *data)
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{
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struct ses_host_edev *sed = data;
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struct scsi_device *sdev;
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if (!scsi_is_sdev_device(edev->edev.parent))
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return 0;
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sdev = to_scsi_device(edev->edev.parent);
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if (sdev->host != sed->shost)
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return 0;
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sed->edev = edev;
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return 1;
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}
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#endif /* 0 */
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static void ses_process_descriptor(struct enclosure_component *ecomp,
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unsigned char *desc)
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{
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int eip = desc[0] & 0x10;
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int invalid = desc[0] & 0x80;
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enum scsi_protocol proto = desc[0] & 0x0f;
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u64 addr = 0;
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struct ses_component *scomp = ecomp->scratch;
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unsigned char *d;
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scomp->desc = desc;
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if (invalid)
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return;
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switch (proto) {
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case SCSI_PROTOCOL_SAS:
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if (eip)
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d = desc + 8;
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else
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d = desc + 4;
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/* only take the phy0 addr */
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addr = (u64)d[12] << 56 |
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(u64)d[13] << 48 |
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(u64)d[14] << 40 |
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(u64)d[15] << 32 |
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(u64)d[16] << 24 |
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(u64)d[17] << 16 |
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(u64)d[18] << 8 |
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(u64)d[19];
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break;
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default:
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/* FIXME: Need to add more protocols than just SAS */
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break;
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}
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scomp->addr = addr;
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}
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struct efd {
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u64 addr;
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struct device *dev;
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};
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static int ses_enclosure_find_by_addr(struct enclosure_device *edev,
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void *data)
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{
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struct efd *efd = data;
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int i;
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struct ses_component *scomp;
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if (!edev->component[0].scratch)
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return 0;
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for (i = 0; i < edev->components; i++) {
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scomp = edev->component[i].scratch;
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if (scomp->addr != efd->addr)
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continue;
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enclosure_add_device(edev, i, efd->dev);
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return 1;
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}
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return 0;
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}
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#define INIT_ALLOC_SIZE 32
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static void ses_enclosure_data_process(struct enclosure_device *edev,
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struct scsi_device *sdev,
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int create)
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{
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u32 result;
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unsigned char *buf = NULL, *type_ptr, *desc_ptr, *addl_desc_ptr = NULL;
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int i, j, page7_len, len, components;
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struct ses_device *ses_dev = edev->scratch;
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int types = ses_dev->page1_num_types;
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unsigned char *hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
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if (!hdr_buf)
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goto simple_populate;
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/* re-read page 10 */
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if (ses_dev->page10)
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ses_recv_diag(sdev, 10, ses_dev->page10, ses_dev->page10_len);
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/* Page 7 for the descriptors is optional */
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result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
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if (result)
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goto simple_populate;
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page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
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/* add 1 for trailing '\0' we'll use */
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buf = kzalloc(len + 1, GFP_KERNEL);
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if (!buf)
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goto simple_populate;
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result = ses_recv_diag(sdev, 7, buf, len);
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if (result) {
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simple_populate:
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kfree(buf);
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buf = NULL;
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desc_ptr = NULL;
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len = 0;
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page7_len = 0;
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} else {
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desc_ptr = buf + 8;
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len = (desc_ptr[2] << 8) + desc_ptr[3];
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/* skip past overall descriptor */
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desc_ptr += len + 4;
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}
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if (ses_dev->page10)
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addl_desc_ptr = ses_dev->page10 + 8;
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type_ptr = ses_dev->page1_types;
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components = 0;
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for (i = 0; i < types; i++, type_ptr += 4) {
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for (j = 0; j < type_ptr[1]; j++) {
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char *name = NULL;
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struct enclosure_component *ecomp;
|
|
|
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if (desc_ptr) {
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if (desc_ptr >= buf + page7_len) {
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desc_ptr = NULL;
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} else {
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len = (desc_ptr[2] << 8) + desc_ptr[3];
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desc_ptr += 4;
|
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/* Add trailing zero - pushes into
|
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* reserved space */
|
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desc_ptr[len] = '\0';
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name = desc_ptr;
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}
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}
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if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
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type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) {
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|
|
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if (create)
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ecomp = enclosure_component_register(edev,
|
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components++,
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type_ptr[0],
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name);
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else
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ecomp = &edev->component[components++];
|
|
|
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if (!IS_ERR(ecomp) && addl_desc_ptr)
|
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ses_process_descriptor(ecomp,
|
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addl_desc_ptr);
|
|
}
|
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if (desc_ptr)
|
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desc_ptr += len;
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|
|
|
if (addl_desc_ptr)
|
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addl_desc_ptr += addl_desc_ptr[1] + 2;
|
|
|
|
}
|
|
}
|
|
kfree(buf);
|
|
kfree(hdr_buf);
|
|
}
|
|
|
|
static void ses_match_to_enclosure(struct enclosure_device *edev,
|
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struct scsi_device *sdev)
|
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{
|
|
unsigned char *desc;
|
|
struct efd efd = {
|
|
.addr = 0,
|
|
};
|
|
|
|
ses_enclosure_data_process(edev, to_scsi_device(edev->edev.parent), 0);
|
|
|
|
if (!sdev->vpd_pg83_len)
|
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return;
|
|
|
|
desc = sdev->vpd_pg83 + 4;
|
|
while (desc < sdev->vpd_pg83 + sdev->vpd_pg83_len) {
|
|
enum scsi_protocol proto = desc[0] >> 4;
|
|
u8 code_set = desc[0] & 0x0f;
|
|
u8 piv = desc[1] & 0x80;
|
|
u8 assoc = (desc[1] & 0x30) >> 4;
|
|
u8 type = desc[1] & 0x0f;
|
|
u8 len = desc[3];
|
|
|
|
if (piv && code_set == 1 && assoc == 1
|
|
&& proto == SCSI_PROTOCOL_SAS && type == 3 && len == 8)
|
|
efd.addr = get_unaligned_be64(&desc[4]);
|
|
|
|
desc += len + 4;
|
|
}
|
|
if (efd.addr) {
|
|
efd.dev = &sdev->sdev_gendev;
|
|
|
|
enclosure_for_each_device(ses_enclosure_find_by_addr, &efd);
|
|
}
|
|
}
|
|
|
|
static int ses_intf_add(struct device *cdev,
|
|
struct class_interface *intf)
|
|
{
|
|
struct scsi_device *sdev = to_scsi_device(cdev->parent);
|
|
struct scsi_device *tmp_sdev;
|
|
unsigned char *buf = NULL, *hdr_buf, *type_ptr;
|
|
struct ses_device *ses_dev;
|
|
u32 result;
|
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int i, types, len, components = 0;
|
|
int err = -ENOMEM;
|
|
int num_enclosures;
|
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struct enclosure_device *edev;
|
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struct ses_component *scomp = NULL;
|
|
|
|
if (!scsi_device_enclosure(sdev)) {
|
|
/* not an enclosure, but might be in one */
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|
struct enclosure_device *prev = NULL;
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|
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while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
|
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ses_match_to_enclosure(edev, sdev);
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prev = edev;
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}
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return -ENODEV;
|
|
}
|
|
|
|
/* TYPE_ENCLOSURE prints a message in probe */
|
|
if (sdev->type != TYPE_ENCLOSURE)
|
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sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device\n");
|
|
|
|
ses_dev = kzalloc(sizeof(*ses_dev), GFP_KERNEL);
|
|
hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
|
|
if (!hdr_buf || !ses_dev)
|
|
goto err_init_free;
|
|
|
|
result = ses_recv_diag(sdev, 1, hdr_buf, INIT_ALLOC_SIZE);
|
|
if (result)
|
|
goto recv_failed;
|
|
|
|
len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
|
|
buf = kzalloc(len, GFP_KERNEL);
|
|
if (!buf)
|
|
goto err_free;
|
|
|
|
result = ses_recv_diag(sdev, 1, buf, len);
|
|
if (result)
|
|
goto recv_failed;
|
|
|
|
types = 0;
|
|
|
|
/* we always have one main enclosure and the rest are referred
|
|
* to as secondary subenclosures */
|
|
num_enclosures = buf[1] + 1;
|
|
|
|
/* begin at the enclosure descriptor */
|
|
type_ptr = buf + 8;
|
|
/* skip all the enclosure descriptors */
|
|
for (i = 0; i < num_enclosures && type_ptr < buf + len; i++) {
|
|
types += type_ptr[2];
|
|
type_ptr += type_ptr[3] + 4;
|
|
}
|
|
|
|
ses_dev->page1_types = type_ptr;
|
|
ses_dev->page1_num_types = types;
|
|
|
|
for (i = 0; i < types && type_ptr < buf + len; i++, type_ptr += 4) {
|
|
if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
|
|
type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
|
|
components += type_ptr[1];
|
|
}
|
|
ses_dev->page1 = buf;
|
|
ses_dev->page1_len = len;
|
|
buf = NULL;
|
|
|
|
result = ses_recv_diag(sdev, 2, hdr_buf, INIT_ALLOC_SIZE);
|
|
if (result)
|
|
goto recv_failed;
|
|
|
|
len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
|
|
buf = kzalloc(len, GFP_KERNEL);
|
|
if (!buf)
|
|
goto err_free;
|
|
|
|
/* make sure getting page 2 actually works */
|
|
result = ses_recv_diag(sdev, 2, buf, len);
|
|
if (result)
|
|
goto recv_failed;
|
|
ses_dev->page2 = buf;
|
|
ses_dev->page2_len = len;
|
|
buf = NULL;
|
|
|
|
/* The additional information page --- allows us
|
|
* to match up the devices */
|
|
result = ses_recv_diag(sdev, 10, hdr_buf, INIT_ALLOC_SIZE);
|
|
if (!result) {
|
|
|
|
len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
|
|
buf = kzalloc(len, GFP_KERNEL);
|
|
if (!buf)
|
|
goto err_free;
|
|
|
|
result = ses_recv_diag(sdev, 10, buf, len);
|
|
if (result)
|
|
goto recv_failed;
|
|
ses_dev->page10 = buf;
|
|
ses_dev->page10_len = len;
|
|
buf = NULL;
|
|
}
|
|
scomp = kzalloc(sizeof(struct ses_component) * components, GFP_KERNEL);
|
|
if (!scomp)
|
|
goto err_free;
|
|
|
|
edev = enclosure_register(cdev->parent, dev_name(&sdev->sdev_gendev),
|
|
components, &ses_enclosure_callbacks);
|
|
if (IS_ERR(edev)) {
|
|
err = PTR_ERR(edev);
|
|
goto err_free;
|
|
}
|
|
|
|
kfree(hdr_buf);
|
|
|
|
edev->scratch = ses_dev;
|
|
for (i = 0; i < components; i++)
|
|
edev->component[i].scratch = scomp + i;
|
|
|
|
ses_enclosure_data_process(edev, sdev, 1);
|
|
|
|
/* see if there are any devices matching before
|
|
* we found the enclosure */
|
|
shost_for_each_device(tmp_sdev, sdev->host) {
|
|
if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
|
|
continue;
|
|
ses_match_to_enclosure(edev, tmp_sdev);
|
|
}
|
|
|
|
return 0;
|
|
|
|
recv_failed:
|
|
sdev_printk(KERN_ERR, sdev, "Failed to get diagnostic page 0x%x\n",
|
|
result);
|
|
err = -ENODEV;
|
|
err_free:
|
|
kfree(buf);
|
|
kfree(scomp);
|
|
kfree(ses_dev->page10);
|
|
kfree(ses_dev->page2);
|
|
kfree(ses_dev->page1);
|
|
err_init_free:
|
|
kfree(ses_dev);
|
|
kfree(hdr_buf);
|
|
sdev_printk(KERN_ERR, sdev, "Failed to bind enclosure %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
static int ses_remove(struct device *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void ses_intf_remove_component(struct scsi_device *sdev)
|
|
{
|
|
struct enclosure_device *edev, *prev = NULL;
|
|
|
|
while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
|
|
prev = edev;
|
|
if (!enclosure_remove_device(edev, &sdev->sdev_gendev))
|
|
break;
|
|
}
|
|
if (edev)
|
|
put_device(&edev->edev);
|
|
}
|
|
|
|
static void ses_intf_remove_enclosure(struct scsi_device *sdev)
|
|
{
|
|
struct enclosure_device *edev;
|
|
struct ses_device *ses_dev;
|
|
|
|
/* exact match to this enclosure */
|
|
edev = enclosure_find(&sdev->sdev_gendev, NULL);
|
|
if (!edev)
|
|
return;
|
|
|
|
ses_dev = edev->scratch;
|
|
edev->scratch = NULL;
|
|
|
|
kfree(ses_dev->page10);
|
|
kfree(ses_dev->page1);
|
|
kfree(ses_dev->page2);
|
|
kfree(ses_dev);
|
|
|
|
kfree(edev->component[0].scratch);
|
|
|
|
put_device(&edev->edev);
|
|
enclosure_unregister(edev);
|
|
}
|
|
|
|
static void ses_intf_remove(struct device *cdev,
|
|
struct class_interface *intf)
|
|
{
|
|
struct scsi_device *sdev = to_scsi_device(cdev->parent);
|
|
|
|
if (!scsi_device_enclosure(sdev))
|
|
ses_intf_remove_component(sdev);
|
|
else
|
|
ses_intf_remove_enclosure(sdev);
|
|
}
|
|
|
|
static struct class_interface ses_interface = {
|
|
.add_dev = ses_intf_add,
|
|
.remove_dev = ses_intf_remove,
|
|
};
|
|
|
|
static struct scsi_driver ses_template = {
|
|
.owner = THIS_MODULE,
|
|
.gendrv = {
|
|
.name = "ses",
|
|
.probe = ses_probe,
|
|
.remove = ses_remove,
|
|
},
|
|
};
|
|
|
|
static int __init ses_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = scsi_register_interface(&ses_interface);
|
|
if (err)
|
|
return err;
|
|
|
|
err = scsi_register_driver(&ses_template.gendrv);
|
|
if (err)
|
|
goto out_unreg;
|
|
|
|
return 0;
|
|
|
|
out_unreg:
|
|
scsi_unregister_interface(&ses_interface);
|
|
return err;
|
|
}
|
|
|
|
static void __exit ses_exit(void)
|
|
{
|
|
scsi_unregister_driver(&ses_template.gendrv);
|
|
scsi_unregister_interface(&ses_interface);
|
|
}
|
|
|
|
module_init(ses_init);
|
|
module_exit(ses_exit);
|
|
|
|
MODULE_ALIAS_SCSI_DEVICE(TYPE_ENCLOSURE);
|
|
|
|
MODULE_AUTHOR("James Bottomley");
|
|
MODULE_DESCRIPTION("SCSI Enclosure Services (ses) driver");
|
|
MODULE_LICENSE("GPL v2");
|