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drivers/scsi/ses.c
17.5 KB
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/* * 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. ** **----------------------------------------------------------------------------- */ |
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#include <linux/slab.h> |
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#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 { |
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unsigned char *page1; |
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unsigned char *page1_types; |
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unsigned char *page2; 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; 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 "); out: return err; } |
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#define SES_TIMEOUT (30 * HZ) |
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#define SES_RETRIES 3 static int ses_recv_diag(struct scsi_device *sdev, int page_code, void *buf, int bufflen) { |
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unsigned char cmd[] = { |
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RECEIVE_DIAGNOSTIC, 1, /* Set PCV bit */ page_code, bufflen >> 8, bufflen & 0xff, 0 }; 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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} static int ses_send_diag(struct scsi_device *sdev, int page_code, void *buf, int bufflen) { u32 result; |
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unsigned char cmd[] = { |
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SEND_DIAGNOSTIC, 0x10, /* Set PF bit */ 0, bufflen >> 8, bufflen & 0xff, 0 }; 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) sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x ", result); return result; } static int ses_set_page2_descriptor(struct enclosure_device *edev, struct enclosure_component *ecomp, |
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unsigned char *desc) |
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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 */ 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++) { 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); } |
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static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev, |
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struct enclosure_component *ecomp) { 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++) { 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; } |
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/* For device slot and array device slot elements, byte 3 bit 6 * is "fault sensed" while byte 3 bit 5 is "fault reqstd". As this * code stands these bits are shifted 4 positions right so in * sysfs they will appear as bits 2 and 1 respectively. Strange. */ |
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static void ses_get_fault(struct enclosure_device *edev, struct enclosure_component *ecomp) { |
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unsigned char *desc; |
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desc = ses_get_page2_descriptor(edev, ecomp); |
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if (desc) ecomp->fault = (desc[3] & 0x60) >> 4; |
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} static int ses_set_fault(struct enclosure_device *edev, struct enclosure_component *ecomp, enum enclosure_component_setting val) { |
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unsigned char desc[4] = {0 }; |
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switch (val) { case ENCLOSURE_SETTING_DISABLED: /* zero is disabled */ break; case ENCLOSURE_SETTING_ENABLED: |
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desc[3] = 0x20; |
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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) { |
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unsigned char *desc; |
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desc = ses_get_page2_descriptor(edev, ecomp); |
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if (desc) ecomp->status = (desc[0] & 0x0f); |
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} static void ses_get_locate(struct enclosure_device *edev, struct enclosure_component *ecomp) { |
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unsigned char *desc; |
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desc = ses_get_page2_descriptor(edev, ecomp); |
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if (desc) ecomp->locate = (desc[2] & 0x02) ? 1 : 0; |
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} static int ses_set_locate(struct enclosure_device *edev, struct enclosure_component *ecomp, enum enclosure_component_setting val) { |
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unsigned char desc[4] = {0 }; |
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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) { |
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unsigned char desc[4] = {0 }; |
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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; }; |
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#if 0 |
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int ses_match_host(struct enclosure_device *edev, void *data) { struct ses_host_edev *sed = data; 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) return 0; sed->edev = edev; return 1; } |
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#endif /* 0 */ |
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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; } |
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#define INIT_ALLOC_SIZE 32 static void ses_enclosure_data_process(struct enclosure_device *edev, struct scsi_device *sdev, int create) { u32 result; unsigned char *buf = NULL, *type_ptr, *desc_ptr, *addl_desc_ptr = NULL; int i, j, page7_len, len, components; 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); if (!hdr_buf) goto simple_populate; /* re-read page 10 */ if (ses_dev->page10) ses_recv_diag(sdev, 10, ses_dev->page10, ses_dev->page10_len); /* 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; len = 0; page7_len = 0; } else { desc_ptr = buf + 8; len = (desc_ptr[2] << 8) + desc_ptr[3]; /* skip past overall descriptor */ desc_ptr += len + 4; |
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} |
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if (ses_dev->page10) addl_desc_ptr = ses_dev->page10 + 8; |
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type_ptr = ses_dev->page1_types; |
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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) { if (create) ecomp = enclosure_component_register(edev, components++, type_ptr[0], name); else ecomp = &edev->component[components++]; 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); } |
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static void ses_match_to_enclosure(struct enclosure_device *edev, struct scsi_device *sdev) { |
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unsigned char *buf; |
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unsigned char *desc; |
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unsigned int vpd_len; |
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struct efd efd = { .addr = 0, }; |
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|
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buf = kmalloc(INIT_ALLOC_SIZE, GFP_KERNEL); if (!buf || scsi_get_vpd_page(sdev, 0x83, buf, INIT_ALLOC_SIZE)) goto free; |
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|
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ses_enclosure_data_process(edev, to_scsi_device(edev->edev.parent), 0); |
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vpd_len = ((buf[2] << 8) | buf[3]) + 4; |
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kfree(buf); buf = kmalloc(vpd_len, GFP_KERNEL); if (!buf ||scsi_get_vpd_page(sdev, 0x83, buf, vpd_len)) goto free; |
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|
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desc = buf + 4; |
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while (desc < buf + vpd_len) { |
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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]; |
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if (piv && code_set == 1 && assoc == 1 |
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&& 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); } |
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static int ses_intf_add(struct device *cdev, |
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struct class_interface *intf) { |
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struct scsi_device *sdev = to_scsi_device(cdev->parent); |
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struct scsi_device *tmp_sdev; |
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unsigned char *buf = NULL, *hdr_buf, *type_ptr; |
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struct ses_device *ses_dev; u32 result; |
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int i, types, len, components = 0; |
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int err = -ENOMEM; |
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int num_enclosures; |
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struct enclosure_device *edev; |
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struct ses_component *scomp = NULL; |
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if (!scsi_device_enclosure(sdev)) { /* not an enclosure, but might be in one */ |
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struct enclosure_device *prev = NULL; 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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} return -ENODEV; } /* TYPE_ENCLOSURE prints a message in probe */ if (sdev->type != TYPE_ENCLOSURE) sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device "); 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; |
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len = (hdr_buf[2] << 8) + hdr_buf[3] + 4; buf = kzalloc(len, GFP_KERNEL); if (!buf) goto err_free; |
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result = ses_recv_diag(sdev, 1, buf, len); if (result) goto recv_failed; |
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types = 0; |
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|
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/* we always have one main enclosure and the rest are referred * to as secondary subenclosures */ num_enclosures = buf[1] + 1; |
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|
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/* 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) { |
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if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE || type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) components += type_ptr[1]; } |
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ses_dev->page1 = buf; ses_dev->page1_len = len; buf = NULL; |
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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; |
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buf = NULL; |
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/* The additional information page --- allows us * to match up the devices */ result = ses_recv_diag(sdev, 10, hdr_buf, INIT_ALLOC_SIZE); |
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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; } |
7c46c20ae [SCSI] ses: fix m... |
595 |
scomp = kzalloc(sizeof(struct ses_component) * components, GFP_KERNEL); |
9927c6886 [SCSI] ses: add n... |
596 |
if (!scomp) |
7c46c20ae [SCSI] ses: fix m... |
597 |
goto err_free; |
9927c6886 [SCSI] ses: add n... |
598 |
|
71610f55f [SCSI] struct dev... |
599 |
edev = enclosure_register(cdev->parent, dev_name(&sdev->sdev_gendev), |
9927c6886 [SCSI] ses: add n... |
600 601 602 603 604 |
components, &ses_enclosure_callbacks); if (IS_ERR(edev)) { err = PTR_ERR(edev); goto err_free; } |
9b3a6549b drivers/scsi/ses.... |
605 |
kfree(hdr_buf); |
9927c6886 [SCSI] ses: add n... |
606 607 |
edev->scratch = ses_dev; for (i = 0; i < components; i++) |
7c46c20ae [SCSI] ses: fix m... |
608 |
edev->component[i].scratch = scomp + i; |
9927c6886 [SCSI] ses: add n... |
609 |
|
21fab1d05 [SCSI] ses: updat... |
610 |
ses_enclosure_data_process(edev, sdev, 1); |
9927c6886 [SCSI] ses: add n... |
611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 |
/* 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 ", result); err = -ENODEV; err_free: kfree(buf); |
7c46c20ae [SCSI] ses: fix m... |
629 |
kfree(scomp); |
9927c6886 [SCSI] ses: add n... |
630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 |
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 ", err); return err; } static int ses_remove(struct device *dev) { return 0; } |
43d8eb9cf [SCSI] ses: add s... |
645 646 647 648 649 650 651 652 653 654 655 656 657 658 |
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) |
9927c6886 [SCSI] ses: add n... |
659 |
{ |
9927c6886 [SCSI] ses: add n... |
660 661 |
struct enclosure_device *edev; struct ses_device *ses_dev; |
163f52b6c [SCSI] ses: fix h... |
662 |
/* exact match to this enclosure */ |
43d8eb9cf [SCSI] ses: add s... |
663 |
edev = enclosure_find(&sdev->sdev_gendev, NULL); |
9927c6886 [SCSI] ses: add n... |
664 665 666 667 668 |
if (!edev) return; ses_dev = edev->scratch; edev->scratch = NULL; |
7c46c20ae [SCSI] ses: fix m... |
669 |
kfree(ses_dev->page10); |
9927c6886 [SCSI] ses: add n... |
670 671 672 673 674 |
kfree(ses_dev->page1); kfree(ses_dev->page2); kfree(ses_dev); kfree(edev->component[0].scratch); |
ee959b00c SCSI: convert str... |
675 |
put_device(&edev->edev); |
9927c6886 [SCSI] ses: add n... |
676 677 |
enclosure_unregister(edev); } |
43d8eb9cf [SCSI] ses: add s... |
678 679 680 681 682 683 684 685 686 687 |
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); } |
9927c6886 [SCSI] ses: add n... |
688 |
static struct class_interface ses_interface = { |
ee959b00c SCSI: convert str... |
689 690 |
.add_dev = ses_intf_add, .remove_dev = ses_intf_remove, |
9927c6886 [SCSI] ses: add n... |
691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 |
}; 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"); |