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 } 274