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 21static 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 54static 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 97static 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 133int 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 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 break; 214 215 case SMP_REPORT_PHY_SATA: 216 req->resid_len -= 16; 217 if ((int)req->resid_len < 0) { 218 req->resid_len = 0; 219 error = -EINVAL; 220 goto out; 221 } 222 rsp->resid_len -= 60; 223 sas_report_phy_sata(sas_ha, resp_data, req_data[9]); 224 break; 225 226 case SMP_REPORT_ROUTE_INFO: 227 /* Can't implement; hosts have no routes */ 228 break; 229 230 case SMP_WRITE_GPIO_REG: 231 break; 232 233 case SMP_CONF_ROUTE_INFO: 234 /* Can't implement; hosts have no routes */ 235 break; 236 237 case SMP_PHY_CONTROL: 238 req->resid_len -= 44; 239 if ((int)req->resid_len < 0) { 240 req->resid_len = 0; 241 error = -EINVAL; 242 goto out; 243 } 244 rsp->resid_len -= 8; 245 sas_phy_control(sas_ha, req_data[9], req_data[10], 246 req_data[32] >> 4, req_data[33] >> 4, 247 resp_data); 248 break; 249 250 case SMP_PHY_TEST_FUNCTION: 251 break; 252 253 default: 254 /* probably a 2.0 function */ 255 break; 256 } 257 258 local_irq_disable(); 259 buf = kmap_atomic(bio_page(rsp->bio), KM_USER0) + bio_offset(rsp->bio); 260 memcpy(buf, resp_data, blk_rq_bytes(rsp)); 261 flush_kernel_dcache_page(bio_page(rsp->bio)); 262 kunmap_atomic(buf - bio_offset(rsp->bio), KM_USER0); 263 local_irq_enable(); 264 265 out: 266 kfree(req_data); 267 kfree(resp_data); 268 return error; 269} 270