/*
* SCSI Enclosure Services
*
* Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
*
**-----------------------------------------------------------------------------
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the GNU General Public License
** version 2 as published by the Free Software Foundation.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**-----------------------------------------------------------------------------
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/enclosure.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_driver.h>
#include <scsi/scsi_host.h>
struct ses_device {
unsigned char *page1;
unsigned char *page2;
unsigned char *page10;
short page1_len;
short page2_len;
short page10_len;
};
struct ses_component {
u64 addr;
unsigned char *desc;
};
static int ses_probe(struct device *dev)
{
struct scsi_device *sdev = to_scsi_device(dev);
int err = -ENODEV;
if (sdev->type != TYPE_ENCLOSURE)
goto out;
err = 0;
sdev_printk(KERN_NOTICE, sdev, "Attached Enclosure device\n");
out:
return err;
}
#define SES_TIMEOUT 30
#define SES_RETRIES 3
static int ses_recv_diag(struct scsi_device *sdev, int page_code,
void *buf, int bufflen)
{
unsigned char cmd[] = {
RECEIVE_DIAGNOSTIC,
1, /* Set PCV bit */
page_code,
bufflen >> 8,
bufflen & 0xff,
0
};
return scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen,
NULL, SES_TIMEOUT, SES_RETRIES);
}
static int ses_send_diag(struct scsi_device *sdev, int page_code,
void *buf, int bufflen)
{
u32 result;
unsigned char cmd[] = {
SEND_DIAGNOSTIC,
0x10, /* Set PF bit */
0,
bufflen >> 8,
bufflen & 0xff,
0
};
result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, buf, bufflen,
NULL, SES_TIMEOUT, SES_RETRIES);
if (result)
sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n",
result);
return result;
}
static int ses_set_page2_descriptor(struct enclosure_device *edev,
struct enclosure_component *ecomp,
unsigned char *desc)
{
int i, j, count = 0, descriptor = ecomp->number;
struct scsi_device *sdev = to_scsi_device(edev->cdev.dev);
struct ses_device *ses_dev = edev->scratch;
unsigned char *type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
unsigned char *desc_ptr = ses_dev->page2 + 8;
/* Clear everything */
memset(desc_ptr, 0, ses_dev->page2_len - 8);
for (i = 0; i < ses_dev->page1[10]; i++, type_ptr += 4) {
for (j = 0; j < type_ptr[1]; j++) {
desc_ptr += 4;
if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
continue;
if (count++ == descriptor) {
memcpy(desc_ptr, desc, 4);
/* set select */
desc_ptr[0] |= 0x80;
/* clear reserved, just in case */
desc_ptr[0] &= 0xf0;
}
}
}
return ses_send_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
}
static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
struct enclosure_component *ecomp)
{
int i, j, count = 0, descriptor = ecomp->number;
struct scsi_device *sdev = to_scsi_device(edev->cdev.dev);
struct ses_device *ses_dev = edev->scratch;
unsigned char *type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
unsigned char *desc_ptr = ses_dev->page2 + 8;
ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
for (i = 0; i < ses_dev->page1[10]; i++, type_ptr += 4) {
for (j = 0; j < type_ptr[1]; j++) {
desc_ptr += 4;
if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
continue;
if (count++ == descriptor)
return desc_ptr;
}
}
return NULL;
}
static void ses_get_fault(struct enclosure_device *edev,
struct enclosure_component *ecomp)
{
unsigned char *desc;
desc = ses_get_page2_descriptor(edev, ecomp);
if (desc)
ecomp->fault = (desc[3] & 0x60) >> 4;
}
static int ses_set_fault(struct enclosure_device *edev,
struct enclosure_component *ecomp,
enum enclosure_component_setting val)
{
unsigned char desc[4] = {0 };
switch (val) {
case ENCLOSURE_SETTING_DISABLED:
/* zero is disabled */
break;
case ENCLOSURE_SETTING_ENABLED:
desc[2] = 0x02;
break;
default:
/* SES doesn't do the SGPIO blink settings */
return -EINVAL;
}
return ses_set_page2_descriptor(edev, ecomp, desc);
}
static void ses_get_status(struct enclosure_device *edev,
struct enclosure_component *ecomp)
{
unsigned char *desc;
desc = ses_get_page2_descriptor(edev, ecomp);
if (desc)
ecomp->status = (desc[0] & 0x0f);
}
static void ses_get_locate(struct enclosure_device *edev,
struct enclosure_component *ecomp)
{
unsigned char *desc;
desc = ses_get_page2_descriptor(edev, ecomp);
if (desc)
ecomp->locate = (desc[2] & 0x02) ? 1 : 0;
}
static int ses_set_locate(struct enclosure_device *edev,
struct enclosure_component *ecomp,
enum enclosure_component_setting val)
{
unsigned char desc[4] = {0 };
switch (val) {
case ENCLOSURE_SETTING_DISABLED:
/* zero is disabled */
break;
case ENCLOSURE_SETTING_ENABLED:
desc[2] = 0x02;
break;
default:
/* SES doesn't do the SGPIO blink settings */
return -EINVAL;
}
return ses_set_page2_descriptor(edev, ecomp, desc);
}
static int ses_set_active(struct enclosure_device *edev,
struct enclosure_component *ecomp,
enum enclosure_component_setting val)
{
unsigned char desc[4] = {0 };
switch (val) {
case ENCLOSURE_SETTING_DISABLED:
/* zero is disabled */
ecomp->active = 0;
break;
case ENCLOSURE_SETTING_ENABLED:
desc[2] = 0x80;
ecomp->active = 1;
break;
default:
/* SES doesn't do the SGPIO blink settings */
return -EINVAL;
}
return ses_set_page2_descriptor(edev, ecomp, desc);
}
static struct enclosure_component_callbacks ses_enclosure_callbacks = {
.get_fault = ses_get_fault,
.set_fault = ses_set_fault,
.get_status = ses_get_status,
.get_locate = ses_get_locate,
.set_locate = ses_set_locate,
.set_active = ses_set_active,
};
struct ses_host_edev {
struct Scsi_Host *shost;
struct enclosure_device *edev;
};
int ses_match_host(struct enclosure_device *edev, void *data)
{
struct ses_host_edev *sed = data;
struct scsi_device *sdev;
if (!scsi_is_sdev_device(edev->cdev.dev))
return 0;
sdev = to_scsi_device(edev->cdev.dev);
if (sdev->host != sed->shost)
return 0;
sed->edev = edev;
return 1;
}
static void ses_process_descriptor(struct enclosure_component *ecomp,
unsigned char *desc)
{
int eip = desc[0] & 0x10;
int invalid = desc[0] & 0x80;
enum scsi_protocol proto = desc[0] & 0x0f;
u64 addr = 0;
struct ses_component *scomp = ecomp->scratch;
unsigned char *d;
scomp->desc = desc;
if (invalid)
return;
switch (proto) {
case SCSI_PROTOCOL_SAS:
if (eip)
d = desc + 8;
else
d = desc + 4;
/* only take the phy0 addr */
addr = (u64)d[12] << 56 |
(u64)d[13] << 48 |
(u64)d[14] << 40 |
(u64)d[15] << 32 |
(u64)d[16] << 24 |
(u64)d[17] << 16 |
(u64)d[18] << 8 |
(u64)d[19];
break;
default:
/* FIXME: Need to add more protocols than just SAS */
break;
}
scomp->addr = addr;
}
struct efd {
u64 addr;
struct device *dev;
};
static int ses_enclosure_find_by_addr(struct enclosure_device *edev,
void *data)
{
struct efd *efd = data;
int i;
struct ses_component *scomp;
if (!edev->component[0].scratch)
return 0;
for (i = 0; i < edev->components; i++) {
scomp = edev->component[i].scratch;
if (scomp->addr != efd->addr)
continue;
enclosure_add_device(edev, i, efd->dev);
return 1;
}
return 0;
}
#define VPD_INQUIRY_SIZE 512
static void ses_match_to_enclosure(struct enclosure_device *edev,
struct scsi_device *sdev)
{
unsigned char *buf = kmalloc(VPD_INQUIRY_SIZE, GFP_KERNEL);
unsigned char *desc;
int len;
struct efd efd = {
.addr = 0,
};
unsigned char cmd[] = {
INQUIRY,
1,
0x83,
VPD_INQUIRY_SIZE >> 8,
VPD_INQUIRY_SIZE & 0xff,
0
};
if (!buf)
return;
if (scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf,
VPD_INQUIRY_SIZE, NULL, SES_TIMEOUT, SES_RETRIES))
goto free;
len = (buf[2] << 8) + buf[3];
desc = buf + 4;
while (desc < buf + 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 && code_set == 1
&& proto == SCSI_PROTOCOL_SAS && type == 3 && len == 8)
efd.addr = (u64)desc[4] << 56 |
(u64)desc[5] << 48 |
(u64)desc[6] << 40 |
(u64)desc[7] << 32 |
(u64)desc[8] << 24 |
(u64)desc[9] << 16 |
(u64)desc[10] << 8 |
(u64)desc[11];
desc += len + 4;
}
if (!efd.addr)
goto free;
efd.dev = &sdev->sdev_gendev;
enclosure_for_each_device(ses_enclosure_find_by_addr, &efd);
free:
kfree(buf);
}
#define INIT_ALLOC_SIZE 32
static int ses_intf_add(struct class_device *cdev,
struct class_interface *intf)
{
struct scsi_device *sdev = to_scsi_device(cdev->dev);
struct scsi_device *tmp_sdev;
unsigned char *buf = NULL, *hdr_buf, *type_ptr, *desc_ptr = NULL,
*addl_desc_ptr = NULL;
struct ses_device *ses_dev;
u32 result;
int i, j, types, len, page7_len = 0, components = 0;
int err = -ENOMEM;
struct enclosure_device *edev;
struct ses_component *scomp = NULL;
if (!scsi_device_enclosure(sdev)) {
/* not an enclosure, but might be in one */
edev = enclosure_find(&sdev->host->shost_gendev);
if (edev) {
ses_match_to_enclosure(edev, sdev);
class_device_put(&edev->cdev);
}
return -ENODEV;
}
/* TYPE_ENCLOSURE prints a message in probe */
if (sdev->type != TYPE_ENCLOSURE)
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;
if (hdr_buf[1] != 0) {
/* FIXME: need subenclosure support; I've just never
* seen a device with subenclosures and it makes the
* traversal routines more complex */
sdev_printk(KERN_ERR, sdev,
"FIXME driver has no support for subenclosures (%d)\n",
hdr_buf[1]);
goto err_free;
}
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 = buf[10];
type_ptr = buf + 12 + buf[11];
for (i = 0; i < types; 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->dev, sdev->sdev_gendev.bus_id,
components, &ses_enclosure_callbacks);
if (IS_ERR(edev)) {
err = PTR_ERR(edev);
goto err_free;
}
edev->scratch = ses_dev;
for (i = 0; i < components; i++)
edev->component[i].scratch = scomp + i;
/* Page 7 for the descriptors is optional */
result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
if (result)
goto simple_populate;
page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
/* add 1 for trailing '\0' we'll use */
buf = kzalloc(len + 1, GFP_KERNEL);
if (!buf)
goto simple_populate;
result = ses_recv_diag(sdev, 7, buf, len);
if (result) {
simple_populate:
kfree(buf);
buf = NULL;
desc_ptr = NULL;
addl_desc_ptr = NULL;
} else {
desc_ptr = buf + 8;
len = (desc_ptr[2] << 8) + desc_ptr[3];
/* skip past overall descriptor */
desc_ptr += len + 4;
if (ses_dev->page10)
addl_desc_ptr = ses_dev->page10 + 8;
}
type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
components = 0;
for (i = 0; i < types; i++, type_ptr += 4) {
for (j = 0; j < type_ptr[1]; j++) {
char *name = NULL;
struct enclosure_component *ecomp;
if (desc_ptr) {
if (desc_ptr >= buf + page7_len) {
desc_ptr = NULL;
} else {
len = (desc_ptr[2] << 8) + desc_ptr[3];
desc_ptr += 4;
/* Add trailing zero - pushes into
* reserved space */
desc_ptr[len] = '\0';
name = desc_ptr;
}
}
if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) {
ecomp = enclosure_component_register(edev,
components++,
type_ptr[0],
name);
if (!IS_ERR(ecomp) && addl_desc_ptr)
ses_process_descriptor(ecomp,
addl_desc_ptr);
}
if (desc_ptr)
desc_ptr += len;
if (addl_desc_ptr)
addl_desc_ptr += addl_desc_ptr[1] + 2;
}
}
kfree(buf);
kfree(hdr_buf);
/* 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(struct class_device *cdev,
struct class_interface *intf)
{
struct scsi_device *sdev = to_scsi_device(cdev->dev);
struct enclosure_device *edev;
struct ses_device *ses_dev;
if (!scsi_device_enclosure(sdev))
return;
edev = enclosure_find(cdev->dev);
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);
class_device_put(&edev->cdev);
enclosure_unregister(edev);
}
static struct class_interface ses_interface = {
.add = ses_intf_add,
.remove = 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");
