drivers/scsi/libsas/sas_host_smp.c

   1 /*
   2  * Serial Attached SCSI (SAS) Expander discovery and configuration
   3  *
   4  * Copyright (C) 2007 James E.J. Bottomley
   5  *              <James.Bottomley@HansenPartnership.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; version 2 only.
  10  */
  11 #include <linux/scatterlist.h>
  12 #include <linux/blkdev.h>
  13
  14 #include "sas_internal.h"
  15
  16 #include <scsi/scsi_transport.h>
  17 #include <scsi/scsi_transport_sas.h>
  18 #include "../scsi_sas_internal.h"
  19
  20 static void sas_host_smp_discover(struct sas_ha_struct *sas_ha, u8 *resp_data,
  21                                   u8 phy_id)
  22 {
  23         struct sas_phy *phy;
  24         struct sas_rphy *rphy;
  25
  26         if (phy_id >= sas_ha->num_phys) {
  27                 resp_data[2] = SMP_RESP_NO_PHY;
  28                 return;
  29         }
  30         resp_data[2] = SMP_RESP_FUNC_ACC;
  31
  32         phy = sas_ha->sas_phy[phy_id]->phy;
  33         resp_data[9] = phy_id;
  34         resp_data[13] = phy->negotiated_linkrate;
  35         memcpy(resp_data + 16, sas_ha->sas_addr, SAS_ADDR_SIZE);
  36         memcpy(resp_data + 24, sas_ha->sas_phy[phy_id]->attached_sas_addr,
  37                SAS_ADDR_SIZE);
  38         resp_data[40] = (phy->minimum_linkrate << 4) |
  39                 phy->minimum_linkrate_hw;
  40         resp_data[41] = (phy->maximum_linkrate << 4) |
  41                 phy->maximum_linkrate_hw;
  42
  43         if (!sas_ha->sas_phy[phy_id]->port ||
  44             !sas_ha->sas_phy[phy_id]->port->port_dev)
  45                 return;
  46
  47         rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy;
  48         resp_data[12] = rphy->identify.device_type << 4;
  49         resp_data[14] = rphy->identify.initiator_port_protocols;
  50         resp_data[15] = rphy->identify.target_port_protocols;
  51 }
  52
  53 static void sas_report_phy_sata(struct sas_ha_struct *sas_ha, u8 *resp_data,
  54                                 u8 phy_id)
  55 {
  56         struct sas_rphy *rphy;
  57         struct dev_to_host_fis *fis;
  58         int i;
  59
  60         if (phy_id >= sas_ha->num_phys) {
  61                 resp_data[2] = SMP_RESP_NO_PHY;
  62                 return;
  63         }
  64
  65         resp_data[2] = SMP_RESP_PHY_NO_SATA;
  66
  67         if (!sas_ha->sas_phy[phy_id]->port)
  68                 return;
  69
  70         rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy;
  71         fis = (struct dev_to_host_fis *)
  72                 sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd;
  73         if (rphy->identify.target_port_protocols != SAS_PROTOCOL_SATA)
  74                 return;
  75
  76         resp_data[2] = SMP_RESP_FUNC_ACC;
  77         resp_data[9] = phy_id;
  78         memcpy(resp_data + 16, sas_ha->sas_phy[phy_id]->attached_sas_addr,
  79                SAS_ADDR_SIZE);
  80
  81         /* check to see if we have a valid d2h fis */
  82         if (fis->fis_type != 0x34)
  83                 return;
  84
  85         /* the d2h fis is required by the standard to be in LE format */
  86         for (i = 0; i < 20; i += 4) {
  87                 u8 *dst = resp_data + 24 + i, *src =
  88                         &sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd[i];
  89                 dst[0] = src[3];
  90                 dst[1] = src[2];
  91                 dst[2] = src[1];
  92                 dst[3] = src[0];
  93         }
  94 }
  95
  96 static void sas_phy_control(struct sas_ha_struct *sas_ha, u8 phy_id,
  97                             u8 phy_op, enum sas_linkrate min,
  98                             enum sas_linkrate max, u8 *resp_data)
  99 {
 100         struct sas_internal *i =
 101                 to_sas_internal(sas_ha->core.shost->transportt);
 102         struct sas_phy_linkrates rates;
 103
 104         if (phy_id >= sas_ha->num_phys) {
 105                 resp_data[2] = SMP_RESP_NO_PHY;
 106                 return;
 107         }
 108         switch (phy_op) {
 109         case PHY_FUNC_NOP:
 110         case PHY_FUNC_LINK_RESET:
 111         case PHY_FUNC_HARD_RESET:
 112         case PHY_FUNC_DISABLE:
 113         case PHY_FUNC_CLEAR_ERROR_LOG:
 114         case PHY_FUNC_CLEAR_AFFIL:
 115         case PHY_FUNC_TX_SATA_PS_SIGNAL:
 116                 break;
 117
 118         default:
 119                 resp_data[2] = SMP_RESP_PHY_UNK_OP;
 120                 return;
 121         }
 122
 123         rates.minimum_linkrate = min;
 124         rates.maximum_linkrate = max;
 125
 126         if (i->dft->lldd_control_phy(sas_ha->sas_phy[phy_id], phy_op, &rates))
 127                 resp_data[2] = SMP_RESP_FUNC_FAILED;
 128         else
 129                 resp_data[2] = SMP_RESP_FUNC_ACC;
 130 }
 131
 132 int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
 133                          struct request *rsp)
 134 {
 135         u8 *req_data = NULL, *resp_data = NULL, *buf;
 136         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 137         int error = -EINVAL;
 138
 139         /* eight is the minimum size for request and response frames */
 140         if (blk_rq_bytes(req) < 8 || blk_rq_bytes(rsp) < 8)
 141                 goto out;
 142
 143         if (bio_offset(req->bio) + blk_rq_bytes(req) > PAGE_SIZE ||
 144             bio_offset(rsp->bio) + blk_rq_bytes(rsp) > PAGE_SIZE) {
 145                 shost_printk(KERN_ERR, shost,
 146                         "SMP request/response frame crosses page boundary");
 147                 goto out;
 148         }
 149
 150         req_data = kzalloc(blk_rq_bytes(req), GFP_KERNEL);
 151
 152         /* make sure frame can always be built ... we copy
 153          * back only the requested length */
 154         resp_data = kzalloc(max(blk_rq_bytes(rsp), 128U), GFP_KERNEL);
 155
 156         if (!req_data || !resp_data) {
 157                 error = -ENOMEM;
 158                 goto out;
 159         }
 160
 161         local_irq_disable();
 162         buf = kmap_atomic(bio_page(req->bio), KM_USER0) + bio_offset(req->bio);
 163         memcpy(req_data, buf, blk_rq_bytes(req));
 164         kunmap_atomic(buf - bio_offset(req->bio), KM_USER0);
 165         local_irq_enable();
 166
 167         if (req_data[0] != SMP_REQUEST)
 168                 goto out;
 169
 170         /* always succeeds ... even if we can't process the request
 171          * the result is in the response frame */
 172         error = 0;
 173
 174         /* set up default don't know response */
 175         resp_data[0] = SMP_RESPONSE;
 176         resp_data[1] = req_data[1];
 177         resp_data[2] = SMP_RESP_FUNC_UNK;
 178
 179         switch (req_data[1]) {
 180         case SMP_REPORT_GENERAL:
 181                 req->resid_len -= 8;
 182                 rsp->resid_len -= 32;
 183                 resp_data[2] = SMP_RESP_FUNC_ACC;
 184                 resp_data[9] = sas_ha->num_phys;
 185                 break;
 186
 187         case SMP_REPORT_MANUF_INFO:
 188                 req->resid_len -= 8;
 189                 rsp->resid_len -= 64;
 190                 resp_data[2] = SMP_RESP_FUNC_ACC;
 191                 memcpy(resp_data + 12, shost->hostt->name,
 192                        SAS_EXPANDER_VENDOR_ID_LEN);
 193                 memcpy(resp_data + 20, "libsas virt phy",
 194                        SAS_EXPANDER_PRODUCT_ID_LEN);
 195                 break;
 196
 197         case SMP_READ_GPIO_REG:
 198                 /* FIXME: need GPIO support in the transport class */
 199                 break;
 200
 201         case SMP_DISCOVER:
 202                 req->resid_len -= 16;
 203                 if ((int)req->resid_len < 0) {
 204                         req->resid_len = 0;
 205                         error = -EINVAL;
 206                         goto out;
 207                 }
 208                 rsp->resid_len -= 56;
 209                 sas_host_smp_discover(sas_ha, resp_data, req_data[9]);
 210                 break;
 211
 212         case SMP_REPORT_PHY_ERR_LOG:
 213                 /* FIXME: could implement this with additional
 214                  * libsas callbacks providing the HW supports it */
 215                 break;
 216
 217         case SMP_REPORT_PHY_SATA:
 218                 req->resid_len -= 16;
 219                 if ((int)req->resid_len < 0) {
 220                         req->resid_len = 0;
 221                         error = -EINVAL;
 222                         goto out;
 223                 }
 224                 rsp->resid_len -= 60;
 225                 sas_report_phy_sata(sas_ha, resp_data, req_data[9]);
 226                 break;
 227
 228         case SMP_REPORT_ROUTE_INFO:
 229                 /* Can't implement; hosts have no routes */
 230                 break;
 231
 232         case SMP_WRITE_GPIO_REG:
 233                 /* FIXME: need GPIO support in the transport class */
 234                 break;
 235
 236         case SMP_CONF_ROUTE_INFO:
 237                 /* Can't implement; hosts have no routes */
 238                 break;
 239
 240         case SMP_PHY_CONTROL:
 241                 req->resid_len -= 44;
 242                 if ((int)req->resid_len < 0) {
 243                         req->resid_len = 0;
 244                         error = -EINVAL;
 245                         goto out;
 246                 }
 247                 rsp->resid_len -= 8;
 248                 sas_phy_control(sas_ha, req_data[9], req_data[10],
 249                                 req_data[32] >> 4, req_data[33] >> 4,
 250                                 resp_data);
 251                 break;
 252
 253         case SMP_PHY_TEST_FUNCTION:
 254                 /* FIXME: should this be implemented? */
 255                 break;
 256
 257         default:
 258                 /* probably a 2.0 function */
 259                 break;
 260         }
 261
 262         local_irq_disable();
 263         buf = kmap_atomic(bio_page(rsp->bio), KM_USER0) + bio_offset(rsp->bio);
 264         memcpy(buf, resp_data, blk_rq_bytes(rsp));
 265         flush_kernel_dcache_page(bio_page(rsp->bio));
 266         kunmap_atomic(buf - bio_offset(rsp->bio), KM_USER0);
 267         local_irq_enable();
 268
 269  out:
 270         kfree(req_data);
 271         kfree(resp_data);
 272         return error;
 273 }