1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Serial Attached SCSI (SAS) Expander discovery and configuration 4 * 5 * Copyright (C) 2007 James E.J. Bottomley 6 * <James.Bottomley@HansenPartnership.com> 7 */ 8 #include <linux/scatterlist.h> 9 #include <linux/blkdev.h> 10 #include <linux/slab.h> 11 #include <linux/export.h> 12 13 #include "sas_internal.h" 14 15 #include <scsi/scsi_transport.h> 16 #include <scsi/scsi_transport_sas.h> 17 #include "../scsi_sas_internal.h" 18 19 static void sas_host_smp_discover(struct sas_ha_struct *sas_ha, u8 *resp_data, 20 u8 phy_id) 21 { 22 struct sas_phy *phy; 23 struct sas_rphy *rphy; 24 25 if (phy_id >= sas_ha->num_phys) { 26 resp_data[2] = SMP_RESP_NO_PHY; 27 return; 28 } 29 resp_data[2] = SMP_RESP_FUNC_ACC; 30 31 phy = sas_ha->sas_phy[phy_id]->phy; 32 resp_data[9] = phy_id; 33 resp_data[13] = phy->negotiated_linkrate; 34 memcpy(resp_data + 16, sas_ha->sas_addr, SAS_ADDR_SIZE); 35 memcpy(resp_data + 24, sas_ha->sas_phy[phy_id]->attached_sas_addr, 36 SAS_ADDR_SIZE); 37 resp_data[40] = (phy->minimum_linkrate << 4) | 38 phy->minimum_linkrate_hw; 39 resp_data[41] = (phy->maximum_linkrate << 4) | 40 phy->maximum_linkrate_hw; 41 42 if (!sas_ha->sas_phy[phy_id]->port || 43 !sas_ha->sas_phy[phy_id]->port->port_dev) 44 return; 45 46 rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy; 47 resp_data[12] = rphy->identify.device_type << 4; 48 resp_data[14] = rphy->identify.initiator_port_protocols; 49 resp_data[15] = rphy->identify.target_port_protocols; 50 } 51 52 /** 53 * to_sas_gpio_gp_bit - given the gpio frame data find the byte/bit position of 'od' 54 * @od: od bit to find 55 * @data: incoming bitstream (from frame) 56 * @index: requested data register index (from frame) 57 * @count: total number of registers in the bitstream (from frame) 58 * @bit: bit position of 'od' in the returned byte 59 * 60 * returns NULL if 'od' is not in 'data' 61 * 62 * From SFF-8485 v0.7: 63 * "In GPIO_TX[1], bit 0 of byte 3 contains the first bit (i.e., OD0.0) 64 * and bit 7 of byte 0 contains the 32nd bit (i.e., OD10.1). 65 * 66 * In GPIO_TX[2], bit 0 of byte 3 contains the 33rd bit (i.e., OD10.2) 67 * and bit 7 of byte 0 contains the 64th bit (i.e., OD21.0)." 68 * 69 * The general-purpose (raw-bitstream) RX registers have the same layout 70 * although 'od' is renamed 'id' for 'input data'. 71 * 72 * SFF-8489 defines the behavior of the LEDs in response to the 'od' values. 73 */ 74 static u8 *to_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count, u8 *bit) 75 { 76 unsigned int reg; 77 u8 byte; 78 79 /* gp registers start at index 1 */ 80 if (index == 0) 81 return NULL; 82 83 index--; /* make index 0-based */ 84 if (od < index * 32) 85 return NULL; 86 87 od -= index * 32; 88 reg = od >> 5; 89 90 if (reg >= count) 91 return NULL; 92 93 od &= (1 << 5) - 1; 94 byte = 3 - (od >> 3); 95 *bit = od & ((1 << 3) - 1); 96 97 return &data[reg * 4 + byte]; 98 } 99 100 int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count) 101 { 102 u8 *byte; 103 u8 bit; 104 105 byte = to_sas_gpio_gp_bit(od, data, index, count, &bit); 106 if (!byte) 107 return -1; 108 109 return (*byte >> bit) & 1; 110 } 111 EXPORT_SYMBOL(try_test_sas_gpio_gp_bit); 112 113 static int sas_host_smp_write_gpio(struct sas_ha_struct *sas_ha, u8 *resp_data, 114 u8 reg_type, u8 reg_index, u8 reg_count, 115 u8 *req_data) 116 { 117 struct sas_internal *i = to_sas_internal(sas_ha->core.shost->transportt); 118 int written; 119 120 if (i->dft->lldd_write_gpio == NULL) { 121 resp_data[2] = SMP_RESP_FUNC_UNK; 122 return 0; 123 } 124 125 written = i->dft->lldd_write_gpio(sas_ha, reg_type, reg_index, 126 reg_count, req_data); 127 128 if (written < 0) { 129 resp_data[2] = SMP_RESP_FUNC_FAILED; 130 written = 0; 131 } else 132 resp_data[2] = SMP_RESP_FUNC_ACC; 133 134 return written; 135 } 136 137 static void sas_report_phy_sata(struct sas_ha_struct *sas_ha, u8 *resp_data, 138 u8 phy_id) 139 { 140 struct sas_rphy *rphy; 141 struct dev_to_host_fis *fis; 142 int i; 143 144 if (phy_id >= sas_ha->num_phys) { 145 resp_data[2] = SMP_RESP_NO_PHY; 146 return; 147 } 148 149 resp_data[2] = SMP_RESP_PHY_NO_SATA; 150 151 if (!sas_ha->sas_phy[phy_id]->port) 152 return; 153 154 rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy; 155 fis = (struct dev_to_host_fis *) 156 sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd; 157 if (rphy->identify.target_port_protocols != SAS_PROTOCOL_SATA) 158 return; 159 160 resp_data[2] = SMP_RESP_FUNC_ACC; 161 resp_data[9] = phy_id; 162 memcpy(resp_data + 16, sas_ha->sas_phy[phy_id]->attached_sas_addr, 163 SAS_ADDR_SIZE); 164 165 /* check to see if we have a valid d2h fis */ 166 if (fis->fis_type != 0x34) 167 return; 168 169 /* the d2h fis is required by the standard to be in LE format */ 170 for (i = 0; i < 20; i += 4) { 171 u8 *dst = resp_data + 24 + i, *src = 172 &sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd[i]; 173 dst[0] = src[3]; 174 dst[1] = src[2]; 175 dst[2] = src[1]; 176 dst[3] = src[0]; 177 } 178 } 179 180 static void sas_phy_control(struct sas_ha_struct *sas_ha, u8 phy_id, 181 u8 phy_op, enum sas_linkrate min, 182 enum sas_linkrate max, u8 *resp_data) 183 { 184 struct sas_internal *i = 185 to_sas_internal(sas_ha->core.shost->transportt); 186 struct sas_phy_linkrates rates; 187 struct asd_sas_phy *asd_phy; 188 189 if (phy_id >= sas_ha->num_phys) { 190 resp_data[2] = SMP_RESP_NO_PHY; 191 return; 192 } 193 194 asd_phy = sas_ha->sas_phy[phy_id]; 195 switch (phy_op) { 196 case PHY_FUNC_NOP: 197 case PHY_FUNC_LINK_RESET: 198 case PHY_FUNC_HARD_RESET: 199 case PHY_FUNC_DISABLE: 200 case PHY_FUNC_CLEAR_ERROR_LOG: 201 case PHY_FUNC_CLEAR_AFFIL: 202 case PHY_FUNC_TX_SATA_PS_SIGNAL: 203 break; 204 205 default: 206 resp_data[2] = SMP_RESP_PHY_UNK_OP; 207 return; 208 } 209 210 rates.minimum_linkrate = min; 211 rates.maximum_linkrate = max; 212 213 /* filter reset requests through libata eh */ 214 if (phy_op == PHY_FUNC_LINK_RESET && sas_try_ata_reset(asd_phy) == 0) { 215 resp_data[2] = SMP_RESP_FUNC_ACC; 216 return; 217 } 218 219 if (i->dft->lldd_control_phy(asd_phy, phy_op, &rates)) 220 resp_data[2] = SMP_RESP_FUNC_FAILED; 221 else 222 resp_data[2] = SMP_RESP_FUNC_ACC; 223 } 224 225 void sas_smp_host_handler(struct bsg_job *job, struct Scsi_Host *shost) 226 { 227 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 228 u8 *req_data, *resp_data; 229 unsigned int reslen = 0; 230 int error = -EINVAL; 231 232 /* eight is the minimum size for request and response frames */ 233 if (job->request_payload.payload_len < 8 || 234 job->reply_payload.payload_len < 8) 235 goto out; 236 237 error = -ENOMEM; 238 req_data = kzalloc(job->request_payload.payload_len, GFP_KERNEL); 239 if (!req_data) 240 goto out; 241 sg_copy_to_buffer(job->request_payload.sg_list, 242 job->request_payload.sg_cnt, req_data, 243 job->request_payload.payload_len); 244 245 /* make sure frame can always be built ... we copy 246 * back only the requested length */ 247 resp_data = kzalloc(max(job->reply_payload.payload_len, 128U), 248 GFP_KERNEL); 249 if (!resp_data) 250 goto out_free_req; 251 252 error = -EINVAL; 253 if (req_data[0] != SMP_REQUEST) 254 goto out_free_resp; 255 256 /* set up default don't know response */ 257 resp_data[0] = SMP_RESPONSE; 258 resp_data[1] = req_data[1]; 259 resp_data[2] = SMP_RESP_FUNC_UNK; 260 261 switch (req_data[1]) { 262 case SMP_REPORT_GENERAL: 263 resp_data[2] = SMP_RESP_FUNC_ACC; 264 resp_data[9] = sas_ha->num_phys; 265 reslen = 32; 266 break; 267 268 case SMP_REPORT_MANUF_INFO: 269 resp_data[2] = SMP_RESP_FUNC_ACC; 270 memcpy(resp_data + 12, shost->hostt->name, 271 SAS_EXPANDER_VENDOR_ID_LEN); 272 memcpy(resp_data + 20, "libsas virt phy", 273 SAS_EXPANDER_PRODUCT_ID_LEN); 274 reslen = 64; 275 break; 276 277 case SMP_READ_GPIO_REG: 278 /* FIXME: need GPIO support in the transport class */ 279 break; 280 281 case SMP_DISCOVER: 282 if (job->request_payload.payload_len < 16) 283 goto out_free_resp; 284 sas_host_smp_discover(sas_ha, resp_data, req_data[9]); 285 reslen = 56; 286 break; 287 288 case SMP_REPORT_PHY_ERR_LOG: 289 /* FIXME: could implement this with additional 290 * libsas callbacks providing the HW supports it */ 291 break; 292 293 case SMP_REPORT_PHY_SATA: 294 if (job->request_payload.payload_len < 16) 295 goto out_free_resp; 296 sas_report_phy_sata(sas_ha, resp_data, req_data[9]); 297 reslen = 60; 298 break; 299 300 case SMP_REPORT_ROUTE_INFO: 301 /* Can't implement; hosts have no routes */ 302 break; 303 304 case SMP_WRITE_GPIO_REG: { 305 /* SFF-8485 v0.7 */ 306 const int base_frame_size = 11; 307 int to_write = req_data[4]; 308 309 if (job->request_payload.payload_len < 310 base_frame_size + to_write * 4) { 311 resp_data[2] = SMP_RESP_INV_FRM_LEN; 312 break; 313 } 314 315 to_write = sas_host_smp_write_gpio(sas_ha, resp_data, req_data[2], 316 req_data[3], to_write, &req_data[8]); 317 reslen = 8; 318 break; 319 } 320 321 case SMP_CONF_ROUTE_INFO: 322 /* Can't implement; hosts have no routes */ 323 break; 324 325 case SMP_PHY_CONTROL: 326 if (job->request_payload.payload_len < 44) 327 goto out_free_resp; 328 sas_phy_control(sas_ha, req_data[9], req_data[10], 329 req_data[32] >> 4, req_data[33] >> 4, 330 resp_data); 331 reslen = 8; 332 break; 333 334 case SMP_PHY_TEST_FUNCTION: 335 /* FIXME: should this be implemented? */ 336 break; 337 338 default: 339 /* probably a 2.0 function */ 340 break; 341 } 342 343 sg_copy_from_buffer(job->reply_payload.sg_list, 344 job->reply_payload.sg_cnt, resp_data, 345 job->reply_payload.payload_len); 346 347 error = 0; 348 out_free_resp: 349 kfree(resp_data); 350 out_free_req: 351 kfree(req_data); 352 out: 353 bsg_job_done(job, error, reslen); 354 } 355