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 } 384