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 #include <linux/slab.h>
  14
  15 #include "sas_internal.h"
  16
  17 #include <scsi/scsi_transport.h>
  18 #include <scsi/scsi_transport_sas.h>
  19 #include "../scsi_sas_internal.h"
  20
  21 static void sas_host_smp_discover(struct sas_ha_struct *sas_ha, u8 *resp_data,
  22                                   u8 phy_id)
  23 {
  24         struct sas_phy *phy;
  25         struct sas_rphy *rphy;
  26
  27         if (phy_id >= sas_ha->num_phys) {
  28                 resp_data[2] = SMP_RESP_NO_PHY;
  29                 return;
  30         }
  31         resp_data[2] = SMP_RESP_FUNC_ACC;
  32
  33         phy = sas_ha->sas_phy[phy_id]->phy;
  34         resp_data[9] = phy_id;
  35         resp_data[13] = phy->negotiated_linkrate;
  36         memcpy(resp_data + 16, sas_ha->sas_addr, SAS_ADDR_SIZE);
  37         memcpy(resp_data + 24, sas_ha->sas_phy[phy_id]->attached_sas_addr,
  38                SAS_ADDR_SIZE);
  39         resp_data[40] = (phy->minimum_linkrate << 4) |
  40                 phy->minimum_linkrate_hw;
  41         resp_data[41] = (phy->maximum_linkrate << 4) |
  42                 phy->maximum_linkrate_hw;
  43
  44         if (!sas_ha->sas_phy[phy_id]->port ||
  45             !sas_ha->sas_phy[phy_id]->port->port_dev)
  46                 return;
  47
  48         rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy;
  49         resp_data[12] = rphy->identify.device_type << 4;
  50         resp_data[14] = rphy->identify.initiator_port_protocols;
  51         resp_data[15] = rphy->identify.target_port_protocols;
  52 }
  53
  54 static void sas_report_phy_sata(struct sas_ha_struct *sas_ha, u8 *resp_data,
  55                                 u8 phy_id)
  56 {
  57         struct sas_rphy *rphy;
  58         struct dev_to_host_fis *fis;
  59         int i;
  60
  61         if (phy_id >= sas_ha->num_phys) {
  62                 resp_data[2] = SMP_RESP_NO_PHY;
  63                 return;
  64         }
  65
  66         resp_data[2] = SMP_RESP_PHY_NO_SATA;
  67
  68         if (!sas_ha->sas_phy[phy_id]->port)
  69                 return;
  70
  71         rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy;
  72         fis = (struct dev_to_host_fis *)
  73                 sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd;
  74         if (rphy->identify.target_port_protocols != SAS_PROTOCOL_SATA)
  75                 return;
  76
  77         resp_data[2] = SMP_RESP_FUNC_ACC;
  78         resp_data[9] = phy_id;
  79         memcpy(resp_data + 16, sas_ha->sas_phy[phy_id]->attached_sas_addr,
  80                SAS_ADDR_SIZE);
  81
  82         /* check to see if we have a valid d2h fis */
  83         if (fis->fis_type != 0x34)
  84                 return;
  85
  86         /* the d2h fis is required by the standard to be in LE format */
  87         for (i = 0; i < 20; i += 4) {
  88                 u8 *dst = resp_data + 24 + i, *src =
  89                         &sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd[i];
  90                 dst[0] = src[3];
  91                 dst[1] = src[2];
  92                 dst[2] = src[1];
  93                 dst[3] = src[0];
  94         }
  95 }
  96
  97 static void sas_phy_control(struct sas_ha_struct *sas_ha, u8 phy_id,
  98                             u8 phy_op, enum sas_linkrate min,
  99                             enum sas_linkrate max, u8 *resp_data)
 100 {
 101         struct sas_internal *i =
 102                 to_sas_internal(sas_ha->core.shost->transportt);
 103         struct sas_phy_linkrates rates;
 104
 105         if (phy_id >= sas_ha->num_phys) {
 106                 resp_data[2] = SMP_RESP_NO_PHY;
 107                 return;
 108         }
 109         switch (phy_op) {
 110         case PHY_FUNC_NOP:
 111         case PHY_FUNC_LINK_RESET:
 112         case PHY_FUNC_HARD_RESET:
 113         case PHY_FUNC_DISABLE:
 114         case PHY_FUNC_CLEAR_ERROR_LOG:
 115         case PHY_FUNC_CLEAR_AFFIL:
 116         case PHY_FUNC_TX_SATA_PS_SIGNAL:
 117                 break;
 118
 119         default:
 120                 resp_data[2] = SMP_RESP_PHY_UNK_OP;
 121                 return;
 122         }
 123
 124         rates.minimum_linkrate = min;
 125         rates.maximum_linkrate = max;
 126
 127         if (i->dft->lldd_control_phy(sas_ha->sas_phy[phy_id], phy_op, &rates))
 128                 resp_data[2] = SMP_RESP_FUNC_FAILED;
 129         else
 130                 resp_data[2] = SMP_RESP_FUNC_ACC;
 131 }
 132
 133 int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
 134                          struct request *rsp)
 135 {
 136         u8 *req_data = NULL, *resp_data = NULL, *buf;
 137         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 138         int error = -EINVAL;
 139
 140         /* eight is the minimum size for request and response frames */
 141         if (blk_rq_bytes(req) < 8 || blk_rq_bytes(rsp) < 8)
 142                 goto out;
 143
 144         if (bio_offset(req->bio) + blk_rq_bytes(req) > PAGE_SIZE ||
 145             bio_offset(rsp->bio) + blk_rq_bytes(rsp) > PAGE_SIZE) {
 146                 shost_printk(KERN_ERR, shost,
 147                         "SMP request/response frame crosses page boundary");
 148                 goto out;
 149         }
 150
 151         req_data = kzalloc(blk_rq_bytes(req), GFP_KERNEL);
 152
 153         /* make sure frame can always be built ... we copy
 154          * back only the requested length */
 155         resp_data = kzalloc(max(blk_rq_bytes(rsp), 128U), GFP_KERNEL);
 156
 157         if (!req_data || !resp_data) {
 158                 error = -ENOMEM;
 159                 goto out;
 160         }
 161
 162         local_irq_disable();
 163         buf = kmap_atomic(bio_page(req->bio), KM_USER0) + bio_offset(req->bio);
 164         memcpy(req_data, buf, blk_rq_bytes(req));
 165         kunmap_atomic(buf - bio_offset(req->bio), KM_USER0);
 166         local_irq_enable();
 167
 168         if (req_data[0] != SMP_REQUEST)
 169                 goto out;
 170
 171         /* always succeeds ... even if we can't process the request
 172          * the result is in the response frame */
 173         error = 0;
 174
 175         /* set up default don't know response */
 176         resp_data[0] = SMP_RESPONSE;
 177         resp_data[1] = req_data[1];
 178         resp_data[2] = SMP_RESP_FUNC_UNK;
 179
 180         switch (req_data[1]) {
 181         case SMP_REPORT_GENERAL:
 182                 req->resid_len -= 8;
 183                 rsp->resid_len -= 32;
 184                 resp_data[2] = SMP_RESP_FUNC_ACC;
 185                 resp_data[9] = sas_ha->num_phys;
 186                 break;
 187
 188         case SMP_REPORT_MANUF_INFO:
 189                 req->resid_len -= 8;
 190                 rsp->resid_len -= 64;
 191                 resp_data[2] = SMP_RESP_FUNC_ACC;
 192                 memcpy(resp_data + 12, shost->hostt->name,
 193                        SAS_EXPANDER_VENDOR_ID_LEN);
 194                 memcpy(resp_data + 20, "libsas virt phy",
 195                        SAS_EXPANDER_PRODUCT_ID_LEN);
 196                 break;
 197
 198         case SMP_READ_GPIO_REG:
 199                 /* FIXME: need GPIO support in the transport class */
 200                 break;
 201
 202         case SMP_DISCOVER:
 203                 req->resid_len -= 16;
 204                 if ((int)req->resid_len < 0) {
 205                         req->resid_len = 0;
 206                         error = -EINVAL;
 207                         goto out;
 208                 }
 209                 rsp->resid_len -= 56;
 210                 sas_host_smp_discover(sas_ha, resp_data, req_data[9]);
 211                 break;
 212
 213         case SMP_REPORT_PHY_ERR_LOG:
 214                 /* FIXME: could implement this with additional
 215                  * libsas callbacks providing the HW supports it */
 216                 break;
 217
 218         case SMP_REPORT_PHY_SATA:
 219                 req->resid_len -= 16;
 220                 if ((int)req->resid_len < 0) {
 221                         req->resid_len = 0;
 222                         error = -EINVAL;
 223                         goto out;
 224                 }
 225                 rsp->resid_len -= 60;
 226                 sas_report_phy_sata(sas_ha, resp_data, req_data[9]);
 227                 break;
 228
 229         case SMP_REPORT_ROUTE_INFO:
 230                 /* Can't implement; hosts have no routes */
 231                 break;
 232
 233         case SMP_WRITE_GPIO_REG:
 234                 /* FIXME: need GPIO support in the transport class */
 235                 break;
 236
 237         case SMP_CONF_ROUTE_INFO:
 238                 /* Can't implement; hosts have no routes */
 239                 break;
 240
 241         case SMP_PHY_CONTROL:
 242                 req->resid_len -= 44;
 243                 if ((int)req->resid_len < 0) {
 244                         req->resid_len = 0;
 245                         error = -EINVAL;
 246                         goto out;
 247                 }
 248                 rsp->resid_len -= 8;
 249                 sas_phy_control(sas_ha, req_data[9], req_data[10],
 250                                 req_data[32] >> 4, req_data[33] >> 4,
 251                                 resp_data);
 252                 break;
 253
 254         case SMP_PHY_TEST_FUNCTION:
 255                 /* FIXME: should this be implemented? */
 256                 break;
 257
 258         default:
 259                 /* probably a 2.0 function */
 260                 break;
 261         }
 262
 263         local_irq_disable();
 264         buf = kmap_atomic(bio_page(rsp->bio), KM_USER0) + bio_offset(rsp->bio);
 265         memcpy(buf, resp_data, blk_rq_bytes(rsp));
 266         flush_kernel_dcache_page(bio_page(rsp->bio));
 267         kunmap_atomic(buf - bio_offset(rsp->bio), KM_USER0);
 268         local_irq_enable();
 269
 270  out:
 271         kfree(req_data);
 272         kfree(resp_data);
 273         return error;
 274 }