--- /dev/null
+/*
+ * 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 {
+ char *page1;
+ char *page2;
+ 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)
+{
+ 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;
+
+ 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,
+ 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;
+ char *type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
+ 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 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;
+ char *type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
+ 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)
+{
+ char *desc;
+
+ desc = ses_get_page2_descriptor(edev, ecomp);
+ ecomp->fault = (desc[3] & 0x60) >> 4;
+}
+
+static int ses_set_fault(struct enclosure_device *edev,
+ struct enclosure_component *ecomp,
+ enum enclosure_component_setting val)
+{
+ 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)
+{
+ char *desc;
+
+ desc = ses_get_page2_descriptor(edev, ecomp);
+ ecomp->status = (desc[0] & 0x0f);
+}
+
+static void ses_get_locate(struct enclosure_device *edev,
+ struct enclosure_component *ecomp)
+{
+ char *desc;
+
+ desc = ses_get_page2_descriptor(edev, ecomp);
+ 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)
+{
+ 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)
+{
+ 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,
+ *addl_desc_ptr;
+ struct ses_device *ses_dev;
+ u32 result;
+ int i, j, types, len, components = 0;
+ int err = -ENOMEM;
+ struct enclosure_device *edev;
+ struct ses_component *scomp;
+
+ 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",
+ buf[1]);
+ goto err_free;
+ }
+
+ len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
+ buf = kzalloc(len, GFP_KERNEL);
+ if (!buf)
+ goto err_free;
+
+ ses_dev->page1 = buf;
+ ses_dev->page1_len = len;
+
+ result = ses_recv_diag(sdev, 1, buf, len);
+ if (result)
+ goto recv_failed;
+
+ types = buf[10];
+ len = buf[11];
+
+ type_ptr = buf + 12 + len;
+
+ 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];
+ }
+
+ 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;
+
+ /* The additional information page --- allows us
+ * to match up the devices */
+ result = ses_recv_diag(sdev, 10, hdr_buf, INIT_ALLOC_SIZE);
+ if (result)
+ goto no_page10;
+
+ 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;
+
+ no_page10:
+ scomp = kmalloc(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++;
+
+ /* Page 7 for the descriptors is optional */
+ buf = NULL;
+ result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
+ if (result)
+ goto simple_populate;
+
+ len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
+ /* add 1 for trailing '\0' we'll use */
+ buf = kzalloc(len + 1, GFP_KERNEL);
+ 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;
+ 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) {
+ 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)
+ continue;
+ ecomp = enclosure_component_register(edev,
+ components++,
+ type_ptr[0],
+ name);
+ if (desc_ptr) {
+ desc_ptr += len;
+ if (!IS_ERR(ecomp))
+ ses_process_descriptor(ecomp,
+ addl_desc_ptr);
+
+ 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(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->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");
projects / openwrt / staging / blogic.git / commitdiff