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 #include <linux/export.h>
  15
  16 #include "sas_internal.h"
  17
  18 #include <scsi/scsi_transport.h>
  19 #include <scsi/scsi_transport_sas.h>
  20 #include "../scsi_sas_internal.h"
  21
  22 static void sas_host_smp_discover(struct sas_ha_struct *sas_ha, u8 *resp_data,
  23                                   u8 phy_id)
  24 {
  25         struct sas_phy *phy;
  26         struct sas_rphy *rphy;
  27
  28         if (phy_id >= sas_ha->num_phys) {
  29                 resp_data[2] = SMP_RESP_NO_PHY;
  30                 return;
  31         }
  32         resp_data[2] = SMP_RESP_FUNC_ACC;
  33
  34         phy = sas_ha->sas_phy[phy_id]->phy;
  35         resp_data[9] = phy_id;
  36         resp_data[13] = phy->negotiated_linkrate;
  37         memcpy(resp_data + 16, sas_ha->sas_addr, SAS_ADDR_SIZE);
  38         memcpy(resp_data + 24, sas_ha->sas_phy[phy_id]->attached_sas_addr,
  39                SAS_ADDR_SIZE);
  40         resp_data[40] = (phy->minimum_linkrate << 4) |
  41                 phy->minimum_linkrate_hw;
  42         resp_data[41] = (phy->maximum_linkrate << 4) |
  43                 phy->maximum_linkrate_hw;
  44
  45         if (!sas_ha->sas_phy[phy_id]->port ||
  46             !sas_ha->sas_phy[phy_id]->port->port_dev)
  47                 return;
  48
  49         rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy;
  50         resp_data[12] = rphy->identify.device_type << 4;
  51         resp_data[14] = rphy->identify.initiator_port_protocols;
  52         resp_data[15] = rphy->identify.target_port_protocols;
  53 }
  54
  55 /**
  56  * to_sas_gpio_gp_bit - given the gpio frame data find the byte/bit position of 'od'
  57  * @od: od bit to find
  58  * @data: incoming bitstream (from frame)
  59  * @index: requested data register index (from frame)
  60  * @count: total number of registers in the bitstream (from frame)
  61  * @bit: bit position of 'od' in the returned byte
  62  *
  63  * returns NULL if 'od' is not in 'data'
  64  *
  65  * From SFF-8485 v0.7:
  66  * "In GPIO_TX[1], bit 0 of byte 3 contains the first bit (i.e., OD0.0)
  67  *  and bit 7 of byte 0 contains the 32nd bit (i.e., OD10.1).
  68  *
  69  *  In GPIO_TX[2], bit 0 of byte 3 contains the 33rd bit (i.e., OD10.2)
  70  *  and bit 7 of byte 0 contains the 64th bit (i.e., OD21.0)."
  71  *
  72  * The general-purpose (raw-bitstream) RX registers have the same layout
  73  * although 'od' is renamed 'id' for 'input data'.
  74  *
  75  * SFF-8489 defines the behavior of the LEDs in response to the 'od' values.
  76  */
  77 static u8 *to_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count, u8 *bit)
  78 {
  79         unsigned int reg;
  80         u8 byte;
  81
  82         /* gp registers start at index 1 */
  83         if (index == 0)
  84                 return NULL;
  85
  86         index--; /* make index 0-based */
  87         if (od < index * 32)
  88                 return NULL;
  89
  90         od -= index * 32;
  91         reg = od >> 5;
  92
  93         if (reg >= count)
  94                 return NULL;
  95
  96         od &= (1 << 5) - 1;
  97         byte = 3 - (od >> 3);
  98         *bit = od & ((1 << 3) - 1);
  99
 100         return &data[reg * 4 + byte];
 101 }
 102
 103 int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count)
 104 {
 105         u8 *byte;
 106         u8 bit;
 107
 108         byte = to_sas_gpio_gp_bit(od, data, index, count, &bit);
 109         if (!byte)
 110                 return -1;
 111
 112         return (*byte >> bit) & 1;
 113 }
 114 EXPORT_SYMBOL(try_test_sas_gpio_gp_bit);
 115
 116 static int sas_host_smp_write_gpio(struct sas_ha_struct *sas_ha, u8 *resp_data,
 117                                    u8 reg_type, u8 reg_index, u8 reg_count,
 118                                    u8 *req_data)
 119 {
 120         struct sas_internal *i = to_sas_internal(sas_ha->core.shost->transportt);
 121         int written;
 122
 123         if (i->dft->lldd_write_gpio == NULL) {
 124                 resp_data[2] = SMP_RESP_FUNC_UNK;
 125                 return 0;
 126         }
 127
 128         written = i->dft->lldd_write_gpio(sas_ha, reg_type, reg_index,
 129                                           reg_count, req_data);
 130
 131         if (written < 0) {
 132                 resp_data[2] = SMP_RESP_FUNC_FAILED;
 133                 written = 0;
 134         } else
 135                 resp_data[2] = SMP_RESP_FUNC_ACC;
 136
 137         return written;
 138 }
 139
 140 static void sas_report_phy_sata(struct sas_ha_struct *sas_ha, u8 *resp_data,
 141                                 u8 phy_id)
 142 {
 143         struct sas_rphy *rphy;
 144         struct dev_to_host_fis *fis;
 145         int i;
 146
 147         if (phy_id >= sas_ha->num_phys) {
 148                 resp_data[2] = SMP_RESP_NO_PHY;
 149                 return;
 150         }
 151
 152         resp_data[2] = SMP_RESP_PHY_NO_SATA;
 153
 154         if (!sas_ha->sas_phy[phy_id]->port)
 155                 return;
 156
 157         rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy;
 158         fis = (struct dev_to_host_fis *)
 159                 sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd;
 160         if (rphy->identify.target_port_protocols != SAS_PROTOCOL_SATA)
 161                 return;
 162
 163         resp_data[2] = SMP_RESP_FUNC_ACC;
 164         resp_data[9] = phy_id;
 165         memcpy(resp_data + 16, sas_ha->sas_phy[phy_id]->attached_sas_addr,
 166                SAS_ADDR_SIZE);
 167
 168         /* check to see if we have a valid d2h fis */
 169         if (fis->fis_type != 0x34)
 170                 return;
 171
 172         /* the d2h fis is required by the standard to be in LE format */
 173         for (i = 0; i < 20; i += 4) {
 174                 u8 *dst = resp_data + 24 + i, *src =
 175                         &sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd[i];
 176                 dst[0] = src[3];
 177                 dst[1] = src[2];
 178                 dst[2] = src[1];
 179                 dst[3] = src[0];
 180         }
 181 }
 182
 183 static void sas_phy_control(struct sas_ha_struct *sas_ha, u8 phy_id,
 184                             u8 phy_op, enum sas_linkrate min,
 185                             enum sas_linkrate max, u8 *resp_data)
 186 {
 187         struct sas_internal *i =
 188                 to_sas_internal(sas_ha->core.shost->transportt);
 189         struct sas_phy_linkrates rates;
 190         struct asd_sas_phy *asd_phy;
 191
 192         if (phy_id >= sas_ha->num_phys) {
 193                 resp_data[2] = SMP_RESP_NO_PHY;
 194                 return;
 195         }
 196
 197         asd_phy = sas_ha->sas_phy[phy_id];
 198         switch (phy_op) {
 199         case PHY_FUNC_NOP:
 200         case PHY_FUNC_LINK_RESET:
 201         case PHY_FUNC_HARD_RESET:
 202         case PHY_FUNC_DISABLE:
 203         case PHY_FUNC_CLEAR_ERROR_LOG:
 204         case PHY_FUNC_CLEAR_AFFIL:
 205         case PHY_FUNC_TX_SATA_PS_SIGNAL:
 206                 break;
 207
 208         default:
 209                 resp_data[2] = SMP_RESP_PHY_UNK_OP;
 210                 return;
 211         }
 212
 213         rates.minimum_linkrate = min;
 214         rates.maximum_linkrate = max;
 215
 216         /* filter reset requests through libata eh */
 217         if (phy_op == PHY_FUNC_LINK_RESET && sas_try_ata_reset(asd_phy) == 0) {
 218                 resp_data[2] = SMP_RESP_FUNC_ACC;
 219                 return;
 220         }
 221
 222         if (i->dft->lldd_control_phy(asd_phy, phy_op, &rates))
 223                 resp_data[2] = SMP_RESP_FUNC_FAILED;
 224         else
 225                 resp_data[2] = SMP_RESP_FUNC_ACC;
 226 }
 227
 228 int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
 229                          struct request *rsp)
 230 {
 231         u8 *req_data = NULL, *resp_data = NULL, *buf;
 232         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 233         int error = -EINVAL;
 234
 235         /* eight is the minimum size for request and response frames */
 236         if (blk_rq_bytes(req) < 8 || blk_rq_bytes(rsp) < 8)
 237                 goto out;
 238
 239         if (bio_offset(req->bio) + blk_rq_bytes(req) > PAGE_SIZE ||
 240             bio_offset(rsp->bio) + blk_rq_bytes(rsp) > PAGE_SIZE) {
 241                 shost_printk(KERN_ERR, shost,
 242                         "SMP request/response frame crosses page boundary");
 243                 goto out;
 244         }
 245
 246         req_data = kzalloc(blk_rq_bytes(req), GFP_KERNEL);
 247
 248         /* make sure frame can always be built ... we copy
 249          * back only the requested length */
 250         resp_data = kzalloc(max(blk_rq_bytes(rsp), 128U), GFP_KERNEL);
 251
 252         if (!req_data || !resp_data) {
 253                 error = -ENOMEM;
 254                 goto out;
 255         }
 256
 257         local_irq_disable();
 258         buf = kmap_atomic(bio_page(req->bio));
 259         memcpy(req_data, buf, blk_rq_bytes(req));
 260         kunmap_atomic(buf - bio_offset(req->bio));
 261         local_irq_enable();
 262
 263         if (req_data[0] != SMP_REQUEST)
 264                 goto out;
 265
 266         /* always succeeds ... even if we can't process the request
 267          * the result is in the response frame */
 268         error = 0;
 269
 270         /* set up default don't know response */
 271         resp_data[0] = SMP_RESPONSE;
 272         resp_data[1] = req_data[1];
 273         resp_data[2] = SMP_RESP_FUNC_UNK;
 274
 275         switch (req_data[1]) {
 276         case SMP_REPORT_GENERAL:
 277                 req->resid_len -= 8;
 278                 rsp->resid_len -= 32;
 279                 resp_data[2] = SMP_RESP_FUNC_ACC;
 280                 resp_data[9] = sas_ha->num_phys;
 281                 break;
 282
 283         case SMP_REPORT_MANUF_INFO:
 284                 req->resid_len -= 8;
 285                 rsp->resid_len -= 64;
 286                 resp_data[2] = SMP_RESP_FUNC_ACC;
 287                 memcpy(resp_data + 12, shost->hostt->name,
 288                        SAS_EXPANDER_VENDOR_ID_LEN);
 289                 memcpy(resp_data + 20, "libsas virt phy",
 290                        SAS_EXPANDER_PRODUCT_ID_LEN);
 291                 break;
 292
 293         case SMP_READ_GPIO_REG:
 294                 /* FIXME: need GPIO support in the transport class */
 295                 break;
 296
 297         case SMP_DISCOVER:
 298                 req->resid_len -= 16;
 299                 if ((int)req->resid_len < 0) {
 300                         req->resid_len = 0;
 301                         error = -EINVAL;
 302                         goto out;
 303                 }
 304                 rsp->resid_len -= 56;
 305                 sas_host_smp_discover(sas_ha, resp_data, req_data[9]);
 306                 break;
 307
 308         case SMP_REPORT_PHY_ERR_LOG:
 309                 /* FIXME: could implement this with additional
 310                  * libsas callbacks providing the HW supports it */
 311                 break;
 312
 313         case SMP_REPORT_PHY_SATA:
 314                 req->resid_len -= 16;
 315                 if ((int)req->resid_len < 0) {
 316                         req->resid_len = 0;
 317                         error = -EINVAL;
 318                         goto out;
 319                 }
 320                 rsp->resid_len -= 60;
 321                 sas_report_phy_sata(sas_ha, resp_data, req_data[9]);
 322                 break;
 323
 324         case SMP_REPORT_ROUTE_INFO:
 325                 /* Can't implement; hosts have no routes */
 326                 break;
 327
 328         case SMP_WRITE_GPIO_REG: {
 329                 /* SFF-8485 v0.7 */
 330                 const int base_frame_size = 11;
 331                 int to_write = req_data[4];
 332
 333                 if (blk_rq_bytes(req) < base_frame_size + to_write * 4 ||
 334                     req->resid_len < base_frame_size + to_write * 4) {
 335                         resp_data[2] = SMP_RESP_INV_FRM_LEN;
 336                         break;
 337                 }
 338
 339                 to_write = sas_host_smp_write_gpio(sas_ha, resp_data, req_data[2],
 340                                                    req_data[3], to_write, &req_data[8]);
 341                 req->resid_len -= base_frame_size + to_write * 4;
 342                 rsp->resid_len -= 8;
 343                 break;
 344         }
 345
 346         case SMP_CONF_ROUTE_INFO:
 347                 /* Can't implement; hosts have no routes */
 348                 break;
 349
 350         case SMP_PHY_CONTROL:
 351                 req->resid_len -= 44;
 352                 if ((int)req->resid_len < 0) {
 353                         req->resid_len = 0;
 354                         error = -EINVAL;
 355                         goto out;
 356                 }
 357                 rsp->resid_len -= 8;
 358                 sas_phy_control(sas_ha, req_data[9], req_data[10],
 359                                 req_data[32] >> 4, req_data[33] >> 4,
 360                                 resp_data);
 361                 break;
 362
 363         case SMP_PHY_TEST_FUNCTION:
 364                 /* FIXME: should this be implemented? */
 365                 break;
 366
 367         default:
 368                 /* probably a 2.0 function */
 369                 break;
 370         }
 371
 372         local_irq_disable();
 373         buf = kmap_atomic(bio_page(rsp->bio));
 374         memcpy(buf, resp_data, blk_rq_bytes(rsp));
 375         flush_kernel_dcache_page(bio_page(rsp->bio));
 376         kunmap_atomic(buf - bio_offset(rsp->bio));
 377         local_irq_enable();
 378
 379  out:
 380         kfree(req_data);
 381         kfree(resp_data);
 382         return error;
 383 }