1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright 2014 IBM Corp. 4 */ 5 6 #include <linux/pci_regs.h> 7 #include <linux/pci_ids.h> 8 #include <linux/device.h> 9 #include <linux/module.h> 10 #include <linux/kernel.h> 11 #include <linux/slab.h> 12 #include <linux/sort.h> 13 #include <linux/pci.h> 14 #include <linux/of.h> 15 #include <linux/delay.h> 16 #include <asm/opal.h> 17 #include <asm/msi_bitmap.h> 18 #include <asm/pnv-pci.h> 19 #include <asm/io.h> 20 #include <asm/reg.h> 21 22 #include "cxl.h" 23 #include <misc/cxl.h> 24 25 26 #define CXL_PCI_VSEC_ID 0x1280 27 #define CXL_VSEC_MIN_SIZE 0x80 28 29 #define CXL_READ_VSEC_LENGTH(dev, vsec, dest) \ 30 { \ 31 pci_read_config_word(dev, vsec + 0x6, dest); \ 32 *dest >>= 4; \ 33 } 34 #define CXL_READ_VSEC_NAFUS(dev, vsec, dest) \ 35 pci_read_config_byte(dev, vsec + 0x8, dest) 36 37 #define CXL_READ_VSEC_STATUS(dev, vsec, dest) \ 38 pci_read_config_byte(dev, vsec + 0x9, dest) 39 #define CXL_STATUS_SECOND_PORT 0x80 40 #define CXL_STATUS_MSI_X_FULL 0x40 41 #define CXL_STATUS_MSI_X_SINGLE 0x20 42 #define CXL_STATUS_FLASH_RW 0x08 43 #define CXL_STATUS_FLASH_RO 0x04 44 #define CXL_STATUS_LOADABLE_AFU 0x02 45 #define CXL_STATUS_LOADABLE_PSL 0x01 46 /* If we see these features we won't try to use the card */ 47 #define CXL_UNSUPPORTED_FEATURES \ 48 (CXL_STATUS_MSI_X_FULL | CXL_STATUS_MSI_X_SINGLE) 49 50 #define CXL_READ_VSEC_MODE_CONTROL(dev, vsec, dest) \ 51 pci_read_config_byte(dev, vsec + 0xa, dest) 52 #define CXL_WRITE_VSEC_MODE_CONTROL(dev, vsec, val) \ 53 pci_write_config_byte(dev, vsec + 0xa, val) 54 #define CXL_VSEC_PROTOCOL_MASK 0xe0 55 #define CXL_VSEC_PROTOCOL_1024TB 0x80 56 #define CXL_VSEC_PROTOCOL_512TB 0x40 57 #define CXL_VSEC_PROTOCOL_256TB 0x20 /* Power 8/9 uses this */ 58 #define CXL_VSEC_PROTOCOL_ENABLE 0x01 59 60 #define CXL_READ_VSEC_PSL_REVISION(dev, vsec, dest) \ 61 pci_read_config_word(dev, vsec + 0xc, dest) 62 #define CXL_READ_VSEC_CAIA_MINOR(dev, vsec, dest) \ 63 pci_read_config_byte(dev, vsec + 0xe, dest) 64 #define CXL_READ_VSEC_CAIA_MAJOR(dev, vsec, dest) \ 65 pci_read_config_byte(dev, vsec + 0xf, dest) 66 #define CXL_READ_VSEC_BASE_IMAGE(dev, vsec, dest) \ 67 pci_read_config_word(dev, vsec + 0x10, dest) 68 69 #define CXL_READ_VSEC_IMAGE_STATE(dev, vsec, dest) \ 70 pci_read_config_byte(dev, vsec + 0x13, dest) 71 #define CXL_WRITE_VSEC_IMAGE_STATE(dev, vsec, val) \ 72 pci_write_config_byte(dev, vsec + 0x13, val) 73 #define CXL_VSEC_USER_IMAGE_LOADED 0x80 /* RO */ 74 #define CXL_VSEC_PERST_LOADS_IMAGE 0x20 /* RW */ 75 #define CXL_VSEC_PERST_SELECT_USER 0x10 /* RW */ 76 77 #define CXL_READ_VSEC_AFU_DESC_OFF(dev, vsec, dest) \ 78 pci_read_config_dword(dev, vsec + 0x20, dest) 79 #define CXL_READ_VSEC_AFU_DESC_SIZE(dev, vsec, dest) \ 80 pci_read_config_dword(dev, vsec + 0x24, dest) 81 #define CXL_READ_VSEC_PS_OFF(dev, vsec, dest) \ 82 pci_read_config_dword(dev, vsec + 0x28, dest) 83 #define CXL_READ_VSEC_PS_SIZE(dev, vsec, dest) \ 84 pci_read_config_dword(dev, vsec + 0x2c, dest) 85 86 87 /* This works a little different than the p1/p2 register accesses to make it 88 * easier to pull out individual fields */ 89 #define AFUD_READ(afu, off) in_be64(afu->native->afu_desc_mmio + off) 90 #define AFUD_READ_LE(afu, off) in_le64(afu->native->afu_desc_mmio + off) 91 #define EXTRACT_PPC_BIT(val, bit) (!!(val & PPC_BIT(bit))) 92 #define EXTRACT_PPC_BITS(val, bs, be) ((val & PPC_BITMASK(bs, be)) >> PPC_BITLSHIFT(be)) 93 94 #define AFUD_READ_INFO(afu) AFUD_READ(afu, 0x0) 95 #define AFUD_NUM_INTS_PER_PROC(val) EXTRACT_PPC_BITS(val, 0, 15) 96 #define AFUD_NUM_PROCS(val) EXTRACT_PPC_BITS(val, 16, 31) 97 #define AFUD_NUM_CRS(val) EXTRACT_PPC_BITS(val, 32, 47) 98 #define AFUD_MULTIMODE(val) EXTRACT_PPC_BIT(val, 48) 99 #define AFUD_PUSH_BLOCK_TRANSFER(val) EXTRACT_PPC_BIT(val, 55) 100 #define AFUD_DEDICATED_PROCESS(val) EXTRACT_PPC_BIT(val, 59) 101 #define AFUD_AFU_DIRECTED(val) EXTRACT_PPC_BIT(val, 61) 102 #define AFUD_TIME_SLICED(val) EXTRACT_PPC_BIT(val, 63) 103 #define AFUD_READ_CR(afu) AFUD_READ(afu, 0x20) 104 #define AFUD_CR_LEN(val) EXTRACT_PPC_BITS(val, 8, 63) 105 #define AFUD_READ_CR_OFF(afu) AFUD_READ(afu, 0x28) 106 #define AFUD_READ_PPPSA(afu) AFUD_READ(afu, 0x30) 107 #define AFUD_PPPSA_PP(val) EXTRACT_PPC_BIT(val, 6) 108 #define AFUD_PPPSA_PSA(val) EXTRACT_PPC_BIT(val, 7) 109 #define AFUD_PPPSA_LEN(val) EXTRACT_PPC_BITS(val, 8, 63) 110 #define AFUD_READ_PPPSA_OFF(afu) AFUD_READ(afu, 0x38) 111 #define AFUD_READ_EB(afu) AFUD_READ(afu, 0x40) 112 #define AFUD_EB_LEN(val) EXTRACT_PPC_BITS(val, 8, 63) 113 #define AFUD_READ_EB_OFF(afu) AFUD_READ(afu, 0x48) 114 115 static const struct pci_device_id cxl_pci_tbl[] = { 116 { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x0477), }, 117 { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x044b), }, 118 { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x04cf), }, 119 { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x0601), }, 120 { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x0623), }, 121 { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x0628), }, 122 { } 123 }; 124 MODULE_DEVICE_TABLE(pci, cxl_pci_tbl); 125 126 127 /* 128 * Mostly using these wrappers to avoid confusion: 129 * priv 1 is BAR2, while priv 2 is BAR0 130 */ 131 static inline resource_size_t p1_base(struct pci_dev *dev) 132 { 133 return pci_resource_start(dev, 2); 134 } 135 136 static inline resource_size_t p1_size(struct pci_dev *dev) 137 { 138 return pci_resource_len(dev, 2); 139 } 140 141 static inline resource_size_t p2_base(struct pci_dev *dev) 142 { 143 return pci_resource_start(dev, 0); 144 } 145 146 static inline resource_size_t p2_size(struct pci_dev *dev) 147 { 148 return pci_resource_len(dev, 0); 149 } 150 151 static int find_cxl_vsec(struct pci_dev *dev) 152 { 153 int vsec = 0; 154 u16 val; 155 156 while ((vsec = pci_find_next_ext_capability(dev, vsec, PCI_EXT_CAP_ID_VNDR))) { 157 pci_read_config_word(dev, vsec + 0x4, &val); 158 if (val == CXL_PCI_VSEC_ID) 159 return vsec; 160 } 161 return 0; 162 163 } 164 165 static void dump_cxl_config_space(struct pci_dev *dev) 166 { 167 int vsec; 168 u32 val; 169 170 dev_info(&dev->dev, "dump_cxl_config_space\n"); 171 172 pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &val); 173 dev_info(&dev->dev, "BAR0: %#.8x\n", val); 174 pci_read_config_dword(dev, PCI_BASE_ADDRESS_1, &val); 175 dev_info(&dev->dev, "BAR1: %#.8x\n", val); 176 pci_read_config_dword(dev, PCI_BASE_ADDRESS_2, &val); 177 dev_info(&dev->dev, "BAR2: %#.8x\n", val); 178 pci_read_config_dword(dev, PCI_BASE_ADDRESS_3, &val); 179 dev_info(&dev->dev, "BAR3: %#.8x\n", val); 180 pci_read_config_dword(dev, PCI_BASE_ADDRESS_4, &val); 181 dev_info(&dev->dev, "BAR4: %#.8x\n", val); 182 pci_read_config_dword(dev, PCI_BASE_ADDRESS_5, &val); 183 dev_info(&dev->dev, "BAR5: %#.8x\n", val); 184 185 dev_info(&dev->dev, "p1 regs: %#llx, len: %#llx\n", 186 p1_base(dev), p1_size(dev)); 187 dev_info(&dev->dev, "p2 regs: %#llx, len: %#llx\n", 188 p2_base(dev), p2_size(dev)); 189 dev_info(&dev->dev, "BAR 4/5: %#llx, len: %#llx\n", 190 pci_resource_start(dev, 4), pci_resource_len(dev, 4)); 191 192 if (!(vsec = find_cxl_vsec(dev))) 193 return; 194 195 #define show_reg(name, what) \ 196 dev_info(&dev->dev, "cxl vsec: %30s: %#x\n", name, what) 197 198 pci_read_config_dword(dev, vsec + 0x0, &val); 199 show_reg("Cap ID", (val >> 0) & 0xffff); 200 show_reg("Cap Ver", (val >> 16) & 0xf); 201 show_reg("Next Cap Ptr", (val >> 20) & 0xfff); 202 pci_read_config_dword(dev, vsec + 0x4, &val); 203 show_reg("VSEC ID", (val >> 0) & 0xffff); 204 show_reg("VSEC Rev", (val >> 16) & 0xf); 205 show_reg("VSEC Length", (val >> 20) & 0xfff); 206 pci_read_config_dword(dev, vsec + 0x8, &val); 207 show_reg("Num AFUs", (val >> 0) & 0xff); 208 show_reg("Status", (val >> 8) & 0xff); 209 show_reg("Mode Control", (val >> 16) & 0xff); 210 show_reg("Reserved", (val >> 24) & 0xff); 211 pci_read_config_dword(dev, vsec + 0xc, &val); 212 show_reg("PSL Rev", (val >> 0) & 0xffff); 213 show_reg("CAIA Ver", (val >> 16) & 0xffff); 214 pci_read_config_dword(dev, vsec + 0x10, &val); 215 show_reg("Base Image Rev", (val >> 0) & 0xffff); 216 show_reg("Reserved", (val >> 16) & 0x0fff); 217 show_reg("Image Control", (val >> 28) & 0x3); 218 show_reg("Reserved", (val >> 30) & 0x1); 219 show_reg("Image Loaded", (val >> 31) & 0x1); 220 221 pci_read_config_dword(dev, vsec + 0x14, &val); 222 show_reg("Reserved", val); 223 pci_read_config_dword(dev, vsec + 0x18, &val); 224 show_reg("Reserved", val); 225 pci_read_config_dword(dev, vsec + 0x1c, &val); 226 show_reg("Reserved", val); 227 228 pci_read_config_dword(dev, vsec + 0x20, &val); 229 show_reg("AFU Descriptor Offset", val); 230 pci_read_config_dword(dev, vsec + 0x24, &val); 231 show_reg("AFU Descriptor Size", val); 232 pci_read_config_dword(dev, vsec + 0x28, &val); 233 show_reg("Problem State Offset", val); 234 pci_read_config_dword(dev, vsec + 0x2c, &val); 235 show_reg("Problem State Size", val); 236 237 pci_read_config_dword(dev, vsec + 0x30, &val); 238 show_reg("Reserved", val); 239 pci_read_config_dword(dev, vsec + 0x34, &val); 240 show_reg("Reserved", val); 241 pci_read_config_dword(dev, vsec + 0x38, &val); 242 show_reg("Reserved", val); 243 pci_read_config_dword(dev, vsec + 0x3c, &val); 244 show_reg("Reserved", val); 245 246 pci_read_config_dword(dev, vsec + 0x40, &val); 247 show_reg("PSL Programming Port", val); 248 pci_read_config_dword(dev, vsec + 0x44, &val); 249 show_reg("PSL Programming Control", val); 250 251 pci_read_config_dword(dev, vsec + 0x48, &val); 252 show_reg("Reserved", val); 253 pci_read_config_dword(dev, vsec + 0x4c, &val); 254 show_reg("Reserved", val); 255 256 pci_read_config_dword(dev, vsec + 0x50, &val); 257 show_reg("Flash Address Register", val); 258 pci_read_config_dword(dev, vsec + 0x54, &val); 259 show_reg("Flash Size Register", val); 260 pci_read_config_dword(dev, vsec + 0x58, &val); 261 show_reg("Flash Status/Control Register", val); 262 pci_read_config_dword(dev, vsec + 0x58, &val); 263 show_reg("Flash Data Port", val); 264 265 #undef show_reg 266 } 267 268 static void dump_afu_descriptor(struct cxl_afu *afu) 269 { 270 u64 val, afu_cr_num, afu_cr_off, afu_cr_len; 271 int i; 272 273 #define show_reg(name, what) \ 274 dev_info(&afu->dev, "afu desc: %30s: %#llx\n", name, what) 275 276 val = AFUD_READ_INFO(afu); 277 show_reg("num_ints_per_process", AFUD_NUM_INTS_PER_PROC(val)); 278 show_reg("num_of_processes", AFUD_NUM_PROCS(val)); 279 show_reg("num_of_afu_CRs", AFUD_NUM_CRS(val)); 280 show_reg("req_prog_mode", val & 0xffffULL); 281 afu_cr_num = AFUD_NUM_CRS(val); 282 283 val = AFUD_READ(afu, 0x8); 284 show_reg("Reserved", val); 285 val = AFUD_READ(afu, 0x10); 286 show_reg("Reserved", val); 287 val = AFUD_READ(afu, 0x18); 288 show_reg("Reserved", val); 289 290 val = AFUD_READ_CR(afu); 291 show_reg("Reserved", (val >> (63-7)) & 0xff); 292 show_reg("AFU_CR_len", AFUD_CR_LEN(val)); 293 afu_cr_len = AFUD_CR_LEN(val) * 256; 294 295 val = AFUD_READ_CR_OFF(afu); 296 afu_cr_off = val; 297 show_reg("AFU_CR_offset", val); 298 299 val = AFUD_READ_PPPSA(afu); 300 show_reg("PerProcessPSA_control", (val >> (63-7)) & 0xff); 301 show_reg("PerProcessPSA Length", AFUD_PPPSA_LEN(val)); 302 303 val = AFUD_READ_PPPSA_OFF(afu); 304 show_reg("PerProcessPSA_offset", val); 305 306 val = AFUD_READ_EB(afu); 307 show_reg("Reserved", (val >> (63-7)) & 0xff); 308 show_reg("AFU_EB_len", AFUD_EB_LEN(val)); 309 310 val = AFUD_READ_EB_OFF(afu); 311 show_reg("AFU_EB_offset", val); 312 313 for (i = 0; i < afu_cr_num; i++) { 314 val = AFUD_READ_LE(afu, afu_cr_off + i * afu_cr_len); 315 show_reg("CR Vendor", val & 0xffff); 316 show_reg("CR Device", (val >> 16) & 0xffff); 317 } 318 #undef show_reg 319 } 320 321 #define P8_CAPP_UNIT0_ID 0xBA 322 #define P8_CAPP_UNIT1_ID 0XBE 323 #define P9_CAPP_UNIT0_ID 0xC0 324 #define P9_CAPP_UNIT1_ID 0xE0 325 326 static int get_phb_index(struct device_node *np, u32 *phb_index) 327 { 328 if (of_property_read_u32(np, "ibm,phb-index", phb_index)) 329 return -ENODEV; 330 return 0; 331 } 332 333 static u64 get_capp_unit_id(struct device_node *np, u32 phb_index) 334 { 335 /* 336 * POWER 8: 337 * - For chips other than POWER8NVL, we only have CAPP 0, 338 * irrespective of which PHB is used. 339 * - For POWER8NVL, assume CAPP 0 is attached to PHB0 and 340 * CAPP 1 is attached to PHB1. 341 */ 342 if (cxl_is_power8()) { 343 if (!pvr_version_is(PVR_POWER8NVL)) 344 return P8_CAPP_UNIT0_ID; 345 346 if (phb_index == 0) 347 return P8_CAPP_UNIT0_ID; 348 349 if (phb_index == 1) 350 return P8_CAPP_UNIT1_ID; 351 } 352 353 /* 354 * POWER 9: 355 * PEC0 (PHB0). Capp ID = CAPP0 (0b1100_0000) 356 * PEC1 (PHB1 - PHB2). No capi mode 357 * PEC2 (PHB3 - PHB4 - PHB5): Capi mode on PHB3 only. Capp ID = CAPP1 (0b1110_0000) 358 */ 359 if (cxl_is_power9()) { 360 if (phb_index == 0) 361 return P9_CAPP_UNIT0_ID; 362 363 if (phb_index == 3) 364 return P9_CAPP_UNIT1_ID; 365 } 366 367 return 0; 368 } 369 370 int cxl_calc_capp_routing(struct pci_dev *dev, u64 *chipid, 371 u32 *phb_index, u64 *capp_unit_id) 372 { 373 int rc; 374 struct device_node *np; 375 const __be32 *prop; 376 377 if (!(np = pnv_pci_get_phb_node(dev))) 378 return -ENODEV; 379 380 while (np && !(prop = of_get_property(np, "ibm,chip-id", NULL))) 381 np = of_get_next_parent(np); 382 if (!np) 383 return -ENODEV; 384 385 *chipid = be32_to_cpup(prop); 386 387 rc = get_phb_index(np, phb_index); 388 if (rc) { 389 pr_err("cxl: invalid phb index\n"); 390 return rc; 391 } 392 393 *capp_unit_id = get_capp_unit_id(np, *phb_index); 394 of_node_put(np); 395 if (!*capp_unit_id) { 396 pr_err("cxl: invalid capp unit id (phb_index: %d)\n", 397 *phb_index); 398 return -ENODEV; 399 } 400 401 return 0; 402 } 403 404 static DEFINE_MUTEX(indications_mutex); 405 406 static int get_phb_indications(struct pci_dev *dev, u64 *capiind, u64 *asnind, 407 u64 *nbwind) 408 { 409 static u64 nbw, asn, capi = 0; 410 struct device_node *np; 411 const __be32 *prop; 412 413 mutex_lock(&indications_mutex); 414 if (!capi) { 415 if (!(np = pnv_pci_get_phb_node(dev))) { 416 mutex_unlock(&indications_mutex); 417 return -ENODEV; 418 } 419 420 prop = of_get_property(np, "ibm,phb-indications", NULL); 421 if (!prop) { 422 nbw = 0x0300UL; /* legacy values */ 423 asn = 0x0400UL; 424 capi = 0x0200UL; 425 } else { 426 nbw = (u64)be32_to_cpu(prop[2]); 427 asn = (u64)be32_to_cpu(prop[1]); 428 capi = (u64)be32_to_cpu(prop[0]); 429 } 430 of_node_put(np); 431 } 432 *capiind = capi; 433 *asnind = asn; 434 *nbwind = nbw; 435 mutex_unlock(&indications_mutex); 436 return 0; 437 } 438 439 int cxl_get_xsl9_dsnctl(struct pci_dev *dev, u64 capp_unit_id, u64 *reg) 440 { 441 u64 xsl_dsnctl; 442 u64 capiind, asnind, nbwind; 443 444 /* 445 * CAPI Identifier bits [0:7] 446 * bit 61:60 MSI bits --> 0 447 * bit 59 TVT selector --> 0 448 */ 449 if (get_phb_indications(dev, &capiind, &asnind, &nbwind)) 450 return -ENODEV; 451 452 /* 453 * Tell XSL where to route data to. 454 * The field chipid should match the PHB CAPI_CMPM register 455 */ 456 xsl_dsnctl = (capiind << (63-15)); /* Bit 57 */ 457 xsl_dsnctl |= (capp_unit_id << (63-15)); 458 459 /* nMMU_ID Defaults to: b’000001001’*/ 460 xsl_dsnctl |= ((u64)0x09 << (63-28)); 461 462 /* 463 * Used to identify CAPI packets which should be sorted into 464 * the Non-Blocking queues by the PHB. This field should match 465 * the PHB PBL_NBW_CMPM register 466 * nbwind=0x03, bits [57:58], must include capi indicator. 467 * Not supported on P9 DD1. 468 */ 469 xsl_dsnctl |= (nbwind << (63-55)); 470 471 /* 472 * Upper 16b address bits of ASB_Notify messages sent to the 473 * system. Need to match the PHB’s ASN Compare/Mask Register. 474 * Not supported on P9 DD1. 475 */ 476 xsl_dsnctl |= asnind; 477 478 *reg = xsl_dsnctl; 479 return 0; 480 } 481 482 static int init_implementation_adapter_regs_psl9(struct cxl *adapter, 483 struct pci_dev *dev) 484 { 485 u64 xsl_dsnctl, psl_fircntl; 486 u64 chipid; 487 u32 phb_index; 488 u64 capp_unit_id; 489 u64 psl_debug; 490 int rc; 491 492 rc = cxl_calc_capp_routing(dev, &chipid, &phb_index, &capp_unit_id); 493 if (rc) 494 return rc; 495 496 rc = cxl_get_xsl9_dsnctl(dev, capp_unit_id, &xsl_dsnctl); 497 if (rc) 498 return rc; 499 500 cxl_p1_write(adapter, CXL_XSL9_DSNCTL, xsl_dsnctl); 501 502 /* Set fir_cntl to recommended value for production env */ 503 psl_fircntl = (0x2ULL << (63-3)); /* ce_report */ 504 psl_fircntl |= (0x1ULL << (63-6)); /* FIR_report */ 505 psl_fircntl |= 0x1ULL; /* ce_thresh */ 506 cxl_p1_write(adapter, CXL_PSL9_FIR_CNTL, psl_fircntl); 507 508 /* Setup the PSL to transmit packets on the PCIe before the 509 * CAPP is enabled. Make sure that CAPP virtual machines are disabled 510 */ 511 cxl_p1_write(adapter, CXL_PSL9_DSNDCTL, 0x0001001000012A10ULL); 512 513 /* 514 * A response to an ASB_Notify request is returned by the 515 * system as an MMIO write to the address defined in 516 * the PSL_TNR_ADDR register. 517 * keep the Reset Value: 0x00020000E0000000 518 */ 519 520 /* Enable XSL rty limit */ 521 cxl_p1_write(adapter, CXL_XSL9_DEF, 0x51F8000000000005ULL); 522 523 /* Change XSL_INV dummy read threshold */ 524 cxl_p1_write(adapter, CXL_XSL9_INV, 0x0000040007FFC200ULL); 525 526 if (phb_index == 3) { 527 /* disable machines 31-47 and 20-27 for DMA */ 528 cxl_p1_write(adapter, CXL_PSL9_APCDEDTYPE, 0x40000FF3FFFF0000ULL); 529 } 530 531 /* Snoop machines */ 532 cxl_p1_write(adapter, CXL_PSL9_APCDEDALLOC, 0x800F000200000000ULL); 533 534 /* Enable NORST and DD2 features */ 535 cxl_p1_write(adapter, CXL_PSL9_DEBUG, 0xC000000000000000ULL); 536 537 /* 538 * Check if PSL has data-cache. We need to flush adapter datacache 539 * when as its about to be removed. 540 */ 541 psl_debug = cxl_p1_read(adapter, CXL_PSL9_DEBUG); 542 if (psl_debug & CXL_PSL_DEBUG_CDC) { 543 dev_dbg(&dev->dev, "No data-cache present\n"); 544 adapter->native->no_data_cache = true; 545 } 546 547 return 0; 548 } 549 550 static int init_implementation_adapter_regs_psl8(struct cxl *adapter, struct pci_dev *dev) 551 { 552 u64 psl_dsnctl, psl_fircntl; 553 u64 chipid; 554 u32 phb_index; 555 u64 capp_unit_id; 556 int rc; 557 558 rc = cxl_calc_capp_routing(dev, &chipid, &phb_index, &capp_unit_id); 559 if (rc) 560 return rc; 561 562 psl_dsnctl = 0x0000900000000000ULL; /* pteupd ttype, scdone */ 563 psl_dsnctl |= (0x2ULL << (63-38)); /* MMIO hang pulse: 256 us */ 564 /* Tell PSL where to route data to */ 565 psl_dsnctl |= (chipid << (63-5)); 566 psl_dsnctl |= (capp_unit_id << (63-13)); 567 568 cxl_p1_write(adapter, CXL_PSL_DSNDCTL, psl_dsnctl); 569 cxl_p1_write(adapter, CXL_PSL_RESLCKTO, 0x20000000200ULL); 570 /* snoop write mask */ 571 cxl_p1_write(adapter, CXL_PSL_SNWRALLOC, 0x00000000FFFFFFFFULL); 572 /* set fir_cntl to recommended value for production env */ 573 psl_fircntl = (0x2ULL << (63-3)); /* ce_report */ 574 psl_fircntl |= (0x1ULL << (63-6)); /* FIR_report */ 575 psl_fircntl |= 0x1ULL; /* ce_thresh */ 576 cxl_p1_write(adapter, CXL_PSL_FIR_CNTL, psl_fircntl); 577 /* for debugging with trace arrays */ 578 cxl_p1_write(adapter, CXL_PSL_TRACE, 0x0000FF7C00000000ULL); 579 580 return 0; 581 } 582 583 /* PSL */ 584 #define TBSYNC_CAL(n) (((u64)n & 0x7) << (63-3)) 585 #define TBSYNC_CNT(n) (((u64)n & 0x7) << (63-6)) 586 /* For the PSL this is a multiple for 0 < n <= 7: */ 587 #define PSL_2048_250MHZ_CYCLES 1 588 589 static void write_timebase_ctrl_psl8(struct cxl *adapter) 590 { 591 cxl_p1_write(adapter, CXL_PSL_TB_CTLSTAT, 592 TBSYNC_CNT(2 * PSL_2048_250MHZ_CYCLES)); 593 } 594 595 static u64 timebase_read_psl9(struct cxl *adapter) 596 { 597 return cxl_p1_read(adapter, CXL_PSL9_Timebase); 598 } 599 600 static u64 timebase_read_psl8(struct cxl *adapter) 601 { 602 return cxl_p1_read(adapter, CXL_PSL_Timebase); 603 } 604 605 static void cxl_setup_psl_timebase(struct cxl *adapter, struct pci_dev *dev) 606 { 607 struct device_node *np; 608 609 adapter->psl_timebase_synced = false; 610 611 if (!(np = pnv_pci_get_phb_node(dev))) 612 return; 613 614 /* Do not fail when CAPP timebase sync is not supported by OPAL */ 615 of_node_get(np); 616 if (! of_get_property(np, "ibm,capp-timebase-sync", NULL)) { 617 of_node_put(np); 618 dev_info(&dev->dev, "PSL timebase inactive: OPAL support missing\n"); 619 return; 620 } 621 of_node_put(np); 622 623 /* 624 * Setup PSL Timebase Control and Status register 625 * with the recommended Timebase Sync Count value 626 */ 627 if (adapter->native->sl_ops->write_timebase_ctrl) 628 adapter->native->sl_ops->write_timebase_ctrl(adapter); 629 630 /* Enable PSL Timebase */ 631 cxl_p1_write(adapter, CXL_PSL_Control, 0x0000000000000000); 632 cxl_p1_write(adapter, CXL_PSL_Control, CXL_PSL_Control_tb); 633 634 return; 635 } 636 637 static int init_implementation_afu_regs_psl9(struct cxl_afu *afu) 638 { 639 return 0; 640 } 641 642 static int init_implementation_afu_regs_psl8(struct cxl_afu *afu) 643 { 644 /* read/write masks for this slice */ 645 cxl_p1n_write(afu, CXL_PSL_APCALLOC_A, 0xFFFFFFFEFEFEFEFEULL); 646 /* APC read/write masks for this slice */ 647 cxl_p1n_write(afu, CXL_PSL_COALLOC_A, 0xFF000000FEFEFEFEULL); 648 /* for debugging with trace arrays */ 649 cxl_p1n_write(afu, CXL_PSL_SLICE_TRACE, 0x0000FFFF00000000ULL); 650 cxl_p1n_write(afu, CXL_PSL_RXCTL_A, CXL_PSL_RXCTL_AFUHP_4S); 651 652 return 0; 653 } 654 655 int cxl_pci_setup_irq(struct cxl *adapter, unsigned int hwirq, 656 unsigned int virq) 657 { 658 struct pci_dev *dev = to_pci_dev(adapter->dev.parent); 659 660 return pnv_cxl_ioda_msi_setup(dev, hwirq, virq); 661 } 662 663 int cxl_update_image_control(struct cxl *adapter) 664 { 665 struct pci_dev *dev = to_pci_dev(adapter->dev.parent); 666 int rc; 667 int vsec; 668 u8 image_state; 669 670 if (!(vsec = find_cxl_vsec(dev))) { 671 dev_err(&dev->dev, "ABORTING: CXL VSEC not found!\n"); 672 return -ENODEV; 673 } 674 675 if ((rc = CXL_READ_VSEC_IMAGE_STATE(dev, vsec, &image_state))) { 676 dev_err(&dev->dev, "failed to read image state: %i\n", rc); 677 return rc; 678 } 679 680 if (adapter->perst_loads_image) 681 image_state |= CXL_VSEC_PERST_LOADS_IMAGE; 682 else 683 image_state &= ~CXL_VSEC_PERST_LOADS_IMAGE; 684 685 if (adapter->perst_select_user) 686 image_state |= CXL_VSEC_PERST_SELECT_USER; 687 else 688 image_state &= ~CXL_VSEC_PERST_SELECT_USER; 689 690 if ((rc = CXL_WRITE_VSEC_IMAGE_STATE(dev, vsec, image_state))) { 691 dev_err(&dev->dev, "failed to update image control: %i\n", rc); 692 return rc; 693 } 694 695 return 0; 696 } 697 698 int cxl_pci_alloc_one_irq(struct cxl *adapter) 699 { 700 struct pci_dev *dev = to_pci_dev(adapter->dev.parent); 701 702 return pnv_cxl_alloc_hwirqs(dev, 1); 703 } 704 705 void cxl_pci_release_one_irq(struct cxl *adapter, int hwirq) 706 { 707 struct pci_dev *dev = to_pci_dev(adapter->dev.parent); 708 709 return pnv_cxl_release_hwirqs(dev, hwirq, 1); 710 } 711 712 int cxl_pci_alloc_irq_ranges(struct cxl_irq_ranges *irqs, 713 struct cxl *adapter, unsigned int num) 714 { 715 struct pci_dev *dev = to_pci_dev(adapter->dev.parent); 716 717 return pnv_cxl_alloc_hwirq_ranges(irqs, dev, num); 718 } 719 720 void cxl_pci_release_irq_ranges(struct cxl_irq_ranges *irqs, 721 struct cxl *adapter) 722 { 723 struct pci_dev *dev = to_pci_dev(adapter->dev.parent); 724 725 pnv_cxl_release_hwirq_ranges(irqs, dev); 726 } 727 728 static int setup_cxl_bars(struct pci_dev *dev) 729 { 730 /* Safety check in case we get backported to < 3.17 without M64 */ 731 if ((p1_base(dev) < 0x100000000ULL) || 732 (p2_base(dev) < 0x100000000ULL)) { 733 dev_err(&dev->dev, "ABORTING: M32 BAR assignment incompatible with CXL\n"); 734 return -ENODEV; 735 } 736 737 /* 738 * BAR 4/5 has a special meaning for CXL and must be programmed with a 739 * special value corresponding to the CXL protocol address range. 740 * For POWER 8/9 that means bits 48:49 must be set to 10 741 */ 742 pci_write_config_dword(dev, PCI_BASE_ADDRESS_4, 0x00000000); 743 pci_write_config_dword(dev, PCI_BASE_ADDRESS_5, 0x00020000); 744 745 return 0; 746 } 747 748 /* pciex node: ibm,opal-m64-window = <0x3d058 0x0 0x3d058 0x0 0x8 0x0>; */ 749 static int switch_card_to_cxl(struct pci_dev *dev) 750 { 751 int vsec; 752 u8 val; 753 int rc; 754 755 dev_info(&dev->dev, "switch card to CXL\n"); 756 757 if (!(vsec = find_cxl_vsec(dev))) { 758 dev_err(&dev->dev, "ABORTING: CXL VSEC not found!\n"); 759 return -ENODEV; 760 } 761 762 if ((rc = CXL_READ_VSEC_MODE_CONTROL(dev, vsec, &val))) { 763 dev_err(&dev->dev, "failed to read current mode control: %i", rc); 764 return rc; 765 } 766 val &= ~CXL_VSEC_PROTOCOL_MASK; 767 val |= CXL_VSEC_PROTOCOL_256TB | CXL_VSEC_PROTOCOL_ENABLE; 768 if ((rc = CXL_WRITE_VSEC_MODE_CONTROL(dev, vsec, val))) { 769 dev_err(&dev->dev, "failed to enable CXL protocol: %i", rc); 770 return rc; 771 } 772 /* 773 * The CAIA spec (v0.12 11.6 Bi-modal Device Support) states 774 * we must wait 100ms after this mode switch before touching 775 * PCIe config space. 776 */ 777 msleep(100); 778 779 return 0; 780 } 781 782 static int pci_map_slice_regs(struct cxl_afu *afu, struct cxl *adapter, struct pci_dev *dev) 783 { 784 u64 p1n_base, p2n_base, afu_desc; 785 const u64 p1n_size = 0x100; 786 const u64 p2n_size = 0x1000; 787 788 p1n_base = p1_base(dev) + 0x10000 + (afu->slice * p1n_size); 789 p2n_base = p2_base(dev) + (afu->slice * p2n_size); 790 afu->psn_phys = p2_base(dev) + (adapter->native->ps_off + (afu->slice * adapter->ps_size)); 791 afu_desc = p2_base(dev) + adapter->native->afu_desc_off + (afu->slice * adapter->native->afu_desc_size); 792 793 if (!(afu->native->p1n_mmio = ioremap(p1n_base, p1n_size))) 794 goto err; 795 if (!(afu->p2n_mmio = ioremap(p2n_base, p2n_size))) 796 goto err1; 797 if (afu_desc) { 798 if (!(afu->native->afu_desc_mmio = ioremap(afu_desc, adapter->native->afu_desc_size))) 799 goto err2; 800 } 801 802 return 0; 803 err2: 804 iounmap(afu->p2n_mmio); 805 err1: 806 iounmap(afu->native->p1n_mmio); 807 err: 808 dev_err(&afu->dev, "Error mapping AFU MMIO regions\n"); 809 return -ENOMEM; 810 } 811 812 static void pci_unmap_slice_regs(struct cxl_afu *afu) 813 { 814 if (afu->p2n_mmio) { 815 iounmap(afu->p2n_mmio); 816 afu->p2n_mmio = NULL; 817 } 818 if (afu->native->p1n_mmio) { 819 iounmap(afu->native->p1n_mmio); 820 afu->native->p1n_mmio = NULL; 821 } 822 if (afu->native->afu_desc_mmio) { 823 iounmap(afu->native->afu_desc_mmio); 824 afu->native->afu_desc_mmio = NULL; 825 } 826 } 827 828 void cxl_pci_release_afu(struct device *dev) 829 { 830 struct cxl_afu *afu = to_cxl_afu(dev); 831 832 pr_devel("%s\n", __func__); 833 834 idr_destroy(&afu->contexts_idr); 835 cxl_release_spa(afu); 836 837 kfree(afu->native); 838 kfree(afu); 839 } 840 841 /* Expects AFU struct to have recently been zeroed out */ 842 static int cxl_read_afu_descriptor(struct cxl_afu *afu) 843 { 844 u64 val; 845 846 val = AFUD_READ_INFO(afu); 847 afu->pp_irqs = AFUD_NUM_INTS_PER_PROC(val); 848 afu->max_procs_virtualised = AFUD_NUM_PROCS(val); 849 afu->crs_num = AFUD_NUM_CRS(val); 850 851 if (AFUD_AFU_DIRECTED(val)) 852 afu->modes_supported |= CXL_MODE_DIRECTED; 853 if (AFUD_DEDICATED_PROCESS(val)) 854 afu->modes_supported |= CXL_MODE_DEDICATED; 855 if (AFUD_TIME_SLICED(val)) 856 afu->modes_supported |= CXL_MODE_TIME_SLICED; 857 858 val = AFUD_READ_PPPSA(afu); 859 afu->pp_size = AFUD_PPPSA_LEN(val) * 4096; 860 afu->psa = AFUD_PPPSA_PSA(val); 861 if ((afu->pp_psa = AFUD_PPPSA_PP(val))) 862 afu->native->pp_offset = AFUD_READ_PPPSA_OFF(afu); 863 864 val = AFUD_READ_CR(afu); 865 afu->crs_len = AFUD_CR_LEN(val) * 256; 866 afu->crs_offset = AFUD_READ_CR_OFF(afu); 867 868 869 /* eb_len is in multiple of 4K */ 870 afu->eb_len = AFUD_EB_LEN(AFUD_READ_EB(afu)) * 4096; 871 afu->eb_offset = AFUD_READ_EB_OFF(afu); 872 873 /* eb_off is 4K aligned so lower 12 bits are always zero */ 874 if (EXTRACT_PPC_BITS(afu->eb_offset, 0, 11) != 0) { 875 dev_warn(&afu->dev, 876 "Invalid AFU error buffer offset %Lx\n", 877 afu->eb_offset); 878 dev_info(&afu->dev, 879 "Ignoring AFU error buffer in the descriptor\n"); 880 /* indicate that no afu buffer exists */ 881 afu->eb_len = 0; 882 } 883 884 return 0; 885 } 886 887 static int cxl_afu_descriptor_looks_ok(struct cxl_afu *afu) 888 { 889 int i, rc; 890 u32 val; 891 892 if (afu->psa && afu->adapter->ps_size < 893 (afu->native->pp_offset + afu->pp_size*afu->max_procs_virtualised)) { 894 dev_err(&afu->dev, "per-process PSA can't fit inside the PSA!\n"); 895 return -ENODEV; 896 } 897 898 if (afu->pp_psa && (afu->pp_size < PAGE_SIZE)) 899 dev_warn(&afu->dev, "AFU uses pp_size(%#016llx) < PAGE_SIZE per-process PSA!\n", afu->pp_size); 900 901 for (i = 0; i < afu->crs_num; i++) { 902 rc = cxl_ops->afu_cr_read32(afu, i, 0, &val); 903 if (rc || val == 0) { 904 dev_err(&afu->dev, "ABORTING: AFU configuration record %i is invalid\n", i); 905 return -EINVAL; 906 } 907 } 908 909 if ((afu->modes_supported & ~CXL_MODE_DEDICATED) && afu->max_procs_virtualised == 0) { 910 /* 911 * We could also check this for the dedicated process model 912 * since the architecture indicates it should be set to 1, but 913 * in that case we ignore the value and I'd rather not risk 914 * breaking any existing dedicated process AFUs that left it as 915 * 0 (not that I'm aware of any). It is clearly an error for an 916 * AFU directed AFU to set this to 0, and would have previously 917 * triggered a bug resulting in the maximum not being enforced 918 * at all since idr_alloc treats 0 as no maximum. 919 */ 920 dev_err(&afu->dev, "AFU does not support any processes\n"); 921 return -EINVAL; 922 } 923 924 return 0; 925 } 926 927 static int sanitise_afu_regs_psl9(struct cxl_afu *afu) 928 { 929 u64 reg; 930 931 /* 932 * Clear out any regs that contain either an IVTE or address or may be 933 * waiting on an acknowledgment to try to be a bit safer as we bring 934 * it online 935 */ 936 reg = cxl_p2n_read(afu, CXL_AFU_Cntl_An); 937 if ((reg & CXL_AFU_Cntl_An_ES_MASK) != CXL_AFU_Cntl_An_ES_Disabled) { 938 dev_warn(&afu->dev, "WARNING: AFU was not disabled: %#016llx\n", reg); 939 if (cxl_ops->afu_reset(afu)) 940 return -EIO; 941 if (cxl_afu_disable(afu)) 942 return -EIO; 943 if (cxl_psl_purge(afu)) 944 return -EIO; 945 } 946 cxl_p1n_write(afu, CXL_PSL_SPAP_An, 0x0000000000000000); 947 cxl_p1n_write(afu, CXL_PSL_AMBAR_An, 0x0000000000000000); 948 reg = cxl_p2n_read(afu, CXL_PSL_DSISR_An); 949 if (reg) { 950 dev_warn(&afu->dev, "AFU had pending DSISR: %#016llx\n", reg); 951 if (reg & CXL_PSL9_DSISR_An_TF) 952 cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_AE); 953 else 954 cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_A); 955 } 956 if (afu->adapter->native->sl_ops->register_serr_irq) { 957 reg = cxl_p1n_read(afu, CXL_PSL_SERR_An); 958 if (reg) { 959 if (reg & ~0x000000007fffffff) 960 dev_warn(&afu->dev, "AFU had pending SERR: %#016llx\n", reg); 961 cxl_p1n_write(afu, CXL_PSL_SERR_An, reg & ~0xffff); 962 } 963 } 964 reg = cxl_p2n_read(afu, CXL_PSL_ErrStat_An); 965 if (reg) { 966 dev_warn(&afu->dev, "AFU had pending error status: %#016llx\n", reg); 967 cxl_p2n_write(afu, CXL_PSL_ErrStat_An, reg); 968 } 969 970 return 0; 971 } 972 973 static int sanitise_afu_regs_psl8(struct cxl_afu *afu) 974 { 975 u64 reg; 976 977 /* 978 * Clear out any regs that contain either an IVTE or address or may be 979 * waiting on an acknowledgement to try to be a bit safer as we bring 980 * it online 981 */ 982 reg = cxl_p2n_read(afu, CXL_AFU_Cntl_An); 983 if ((reg & CXL_AFU_Cntl_An_ES_MASK) != CXL_AFU_Cntl_An_ES_Disabled) { 984 dev_warn(&afu->dev, "WARNING: AFU was not disabled: %#016llx\n", reg); 985 if (cxl_ops->afu_reset(afu)) 986 return -EIO; 987 if (cxl_afu_disable(afu)) 988 return -EIO; 989 if (cxl_psl_purge(afu)) 990 return -EIO; 991 } 992 cxl_p1n_write(afu, CXL_PSL_SPAP_An, 0x0000000000000000); 993 cxl_p1n_write(afu, CXL_PSL_IVTE_Limit_An, 0x0000000000000000); 994 cxl_p1n_write(afu, CXL_PSL_IVTE_Offset_An, 0x0000000000000000); 995 cxl_p1n_write(afu, CXL_PSL_AMBAR_An, 0x0000000000000000); 996 cxl_p1n_write(afu, CXL_PSL_SPOffset_An, 0x0000000000000000); 997 cxl_p1n_write(afu, CXL_HAURP_An, 0x0000000000000000); 998 cxl_p2n_write(afu, CXL_CSRP_An, 0x0000000000000000); 999 cxl_p2n_write(afu, CXL_AURP1_An, 0x0000000000000000); 1000 cxl_p2n_write(afu, CXL_AURP0_An, 0x0000000000000000); 1001 cxl_p2n_write(afu, CXL_SSTP1_An, 0x0000000000000000); 1002 cxl_p2n_write(afu, CXL_SSTP0_An, 0x0000000000000000); 1003 reg = cxl_p2n_read(afu, CXL_PSL_DSISR_An); 1004 if (reg) { 1005 dev_warn(&afu->dev, "AFU had pending DSISR: %#016llx\n", reg); 1006 if (reg & CXL_PSL_DSISR_TRANS) 1007 cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_AE); 1008 else 1009 cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_A); 1010 } 1011 if (afu->adapter->native->sl_ops->register_serr_irq) { 1012 reg = cxl_p1n_read(afu, CXL_PSL_SERR_An); 1013 if (reg) { 1014 if (reg & ~0xffff) 1015 dev_warn(&afu->dev, "AFU had pending SERR: %#016llx\n", reg); 1016 cxl_p1n_write(afu, CXL_PSL_SERR_An, reg & ~0xffff); 1017 } 1018 } 1019 reg = cxl_p2n_read(afu, CXL_PSL_ErrStat_An); 1020 if (reg) { 1021 dev_warn(&afu->dev, "AFU had pending error status: %#016llx\n", reg); 1022 cxl_p2n_write(afu, CXL_PSL_ErrStat_An, reg); 1023 } 1024 1025 return 0; 1026 } 1027 1028 #define ERR_BUFF_MAX_COPY_SIZE PAGE_SIZE 1029 /* 1030 * afu_eb_read: 1031 * Called from sysfs and reads the afu error info buffer. The h/w only supports 1032 * 4/8 bytes aligned access. So in case the requested offset/count arent 8 byte 1033 * aligned the function uses a bounce buffer which can be max PAGE_SIZE. 1034 */ 1035 ssize_t cxl_pci_afu_read_err_buffer(struct cxl_afu *afu, char *buf, 1036 loff_t off, size_t count) 1037 { 1038 loff_t aligned_start, aligned_end; 1039 size_t aligned_length; 1040 void *tbuf; 1041 const void __iomem *ebuf = afu->native->afu_desc_mmio + afu->eb_offset; 1042 1043 if (count == 0 || off < 0 || (size_t)off >= afu->eb_len) 1044 return 0; 1045 1046 /* calculate aligned read window */ 1047 count = min((size_t)(afu->eb_len - off), count); 1048 aligned_start = round_down(off, 8); 1049 aligned_end = round_up(off + count, 8); 1050 aligned_length = aligned_end - aligned_start; 1051 1052 /* max we can copy in one read is PAGE_SIZE */ 1053 if (aligned_length > ERR_BUFF_MAX_COPY_SIZE) { 1054 aligned_length = ERR_BUFF_MAX_COPY_SIZE; 1055 count = ERR_BUFF_MAX_COPY_SIZE - (off & 0x7); 1056 } 1057 1058 /* use bounce buffer for copy */ 1059 tbuf = (void *)__get_free_page(GFP_KERNEL); 1060 if (!tbuf) 1061 return -ENOMEM; 1062 1063 /* perform aligned read from the mmio region */ 1064 memcpy_fromio(tbuf, ebuf + aligned_start, aligned_length); 1065 memcpy(buf, tbuf + (off & 0x7), count); 1066 1067 free_page((unsigned long)tbuf); 1068 1069 return count; 1070 } 1071 1072 static int pci_configure_afu(struct cxl_afu *afu, struct cxl *adapter, struct pci_dev *dev) 1073 { 1074 int rc; 1075 1076 if ((rc = pci_map_slice_regs(afu, adapter, dev))) 1077 return rc; 1078 1079 if (adapter->native->sl_ops->sanitise_afu_regs) { 1080 rc = adapter->native->sl_ops->sanitise_afu_regs(afu); 1081 if (rc) 1082 goto err1; 1083 } 1084 1085 /* We need to reset the AFU before we can read the AFU descriptor */ 1086 if ((rc = cxl_ops->afu_reset(afu))) 1087 goto err1; 1088 1089 if (cxl_verbose) 1090 dump_afu_descriptor(afu); 1091 1092 if ((rc = cxl_read_afu_descriptor(afu))) 1093 goto err1; 1094 1095 if ((rc = cxl_afu_descriptor_looks_ok(afu))) 1096 goto err1; 1097 1098 if (adapter->native->sl_ops->afu_regs_init) 1099 if ((rc = adapter->native->sl_ops->afu_regs_init(afu))) 1100 goto err1; 1101 1102 if (adapter->native->sl_ops->register_serr_irq) 1103 if ((rc = adapter->native->sl_ops->register_serr_irq(afu))) 1104 goto err1; 1105 1106 if ((rc = cxl_native_register_psl_irq(afu))) 1107 goto err2; 1108 1109 atomic_set(&afu->configured_state, 0); 1110 return 0; 1111 1112 err2: 1113 if (adapter->native->sl_ops->release_serr_irq) 1114 adapter->native->sl_ops->release_serr_irq(afu); 1115 err1: 1116 pci_unmap_slice_regs(afu); 1117 return rc; 1118 } 1119 1120 static void pci_deconfigure_afu(struct cxl_afu *afu) 1121 { 1122 /* 1123 * It's okay to deconfigure when AFU is already locked, otherwise wait 1124 * until there are no readers 1125 */ 1126 if (atomic_read(&afu->configured_state) != -1) { 1127 while (atomic_cmpxchg(&afu->configured_state, 0, -1) != -1) 1128 schedule(); 1129 } 1130 cxl_native_release_psl_irq(afu); 1131 if (afu->adapter->native->sl_ops->release_serr_irq) 1132 afu->adapter->native->sl_ops->release_serr_irq(afu); 1133 pci_unmap_slice_regs(afu); 1134 } 1135 1136 static int pci_init_afu(struct cxl *adapter, int slice, struct pci_dev *dev) 1137 { 1138 struct cxl_afu *afu; 1139 int rc = -ENOMEM; 1140 1141 afu = cxl_alloc_afu(adapter, slice); 1142 if (!afu) 1143 return -ENOMEM; 1144 1145 afu->native = kzalloc(sizeof(struct cxl_afu_native), GFP_KERNEL); 1146 if (!afu->native) 1147 goto err_free_afu; 1148 1149 mutex_init(&afu->native->spa_mutex); 1150 1151 rc = dev_set_name(&afu->dev, "afu%i.%i", adapter->adapter_num, slice); 1152 if (rc) 1153 goto err_free_native; 1154 1155 rc = pci_configure_afu(afu, adapter, dev); 1156 if (rc) 1157 goto err_free_native; 1158 1159 /* Don't care if this fails */ 1160 cxl_debugfs_afu_add(afu); 1161 1162 /* 1163 * After we call this function we must not free the afu directly, even 1164 * if it returns an error! 1165 */ 1166 if ((rc = cxl_register_afu(afu))) 1167 goto err_put1; 1168 1169 if ((rc = cxl_sysfs_afu_add(afu))) 1170 goto err_put1; 1171 1172 adapter->afu[afu->slice] = afu; 1173 1174 if ((rc = cxl_pci_vphb_add(afu))) 1175 dev_info(&afu->dev, "Can't register vPHB\n"); 1176 1177 return 0; 1178 1179 err_put1: 1180 pci_deconfigure_afu(afu); 1181 cxl_debugfs_afu_remove(afu); 1182 device_unregister(&afu->dev); 1183 return rc; 1184 1185 err_free_native: 1186 kfree(afu->native); 1187 err_free_afu: 1188 kfree(afu); 1189 return rc; 1190 1191 } 1192 1193 static void cxl_pci_remove_afu(struct cxl_afu *afu) 1194 { 1195 pr_devel("%s\n", __func__); 1196 1197 if (!afu) 1198 return; 1199 1200 cxl_pci_vphb_remove(afu); 1201 cxl_sysfs_afu_remove(afu); 1202 cxl_debugfs_afu_remove(afu); 1203 1204 spin_lock(&afu->adapter->afu_list_lock); 1205 afu->adapter->afu[afu->slice] = NULL; 1206 spin_unlock(&afu->adapter->afu_list_lock); 1207 1208 cxl_context_detach_all(afu); 1209 cxl_ops->afu_deactivate_mode(afu, afu->current_mode); 1210 1211 pci_deconfigure_afu(afu); 1212 device_unregister(&afu->dev); 1213 } 1214 1215 int cxl_pci_reset(struct cxl *adapter) 1216 { 1217 struct pci_dev *dev = to_pci_dev(adapter->dev.parent); 1218 int rc; 1219 1220 if (adapter->perst_same_image) { 1221 dev_warn(&dev->dev, 1222 "cxl: refusing to reset/reflash when perst_reloads_same_image is set.\n"); 1223 return -EINVAL; 1224 } 1225 1226 dev_info(&dev->dev, "CXL reset\n"); 1227 1228 /* 1229 * The adapter is about to be reset, so ignore errors. 1230 */ 1231 cxl_data_cache_flush(adapter); 1232 1233 /* pcie_warm_reset requests a fundamental pci reset which includes a 1234 * PERST assert/deassert. PERST triggers a loading of the image 1235 * if "user" or "factory" is selected in sysfs */ 1236 if ((rc = pci_set_pcie_reset_state(dev, pcie_warm_reset))) { 1237 dev_err(&dev->dev, "cxl: pcie_warm_reset failed\n"); 1238 return rc; 1239 } 1240 1241 return rc; 1242 } 1243 1244 static int cxl_map_adapter_regs(struct cxl *adapter, struct pci_dev *dev) 1245 { 1246 if (pci_request_region(dev, 2, "priv 2 regs")) 1247 goto err1; 1248 if (pci_request_region(dev, 0, "priv 1 regs")) 1249 goto err2; 1250 1251 pr_devel("cxl_map_adapter_regs: p1: %#016llx %#llx, p2: %#016llx %#llx", 1252 p1_base(dev), p1_size(dev), p2_base(dev), p2_size(dev)); 1253 1254 if (!(adapter->native->p1_mmio = ioremap(p1_base(dev), p1_size(dev)))) 1255 goto err3; 1256 1257 if (!(adapter->native->p2_mmio = ioremap(p2_base(dev), p2_size(dev)))) 1258 goto err4; 1259 1260 return 0; 1261 1262 err4: 1263 iounmap(adapter->native->p1_mmio); 1264 adapter->native->p1_mmio = NULL; 1265 err3: 1266 pci_release_region(dev, 0); 1267 err2: 1268 pci_release_region(dev, 2); 1269 err1: 1270 return -ENOMEM; 1271 } 1272 1273 static void cxl_unmap_adapter_regs(struct cxl *adapter) 1274 { 1275 if (adapter->native->p1_mmio) { 1276 iounmap(adapter->native->p1_mmio); 1277 adapter->native->p1_mmio = NULL; 1278 pci_release_region(to_pci_dev(adapter->dev.parent), 2); 1279 } 1280 if (adapter->native->p2_mmio) { 1281 iounmap(adapter->native->p2_mmio); 1282 adapter->native->p2_mmio = NULL; 1283 pci_release_region(to_pci_dev(adapter->dev.parent), 0); 1284 } 1285 } 1286 1287 static int cxl_read_vsec(struct cxl *adapter, struct pci_dev *dev) 1288 { 1289 int vsec; 1290 u32 afu_desc_off, afu_desc_size; 1291 u32 ps_off, ps_size; 1292 u16 vseclen; 1293 u8 image_state; 1294 1295 if (!(vsec = find_cxl_vsec(dev))) { 1296 dev_err(&dev->dev, "ABORTING: CXL VSEC not found!\n"); 1297 return -ENODEV; 1298 } 1299 1300 CXL_READ_VSEC_LENGTH(dev, vsec, &vseclen); 1301 if (vseclen < CXL_VSEC_MIN_SIZE) { 1302 dev_err(&dev->dev, "ABORTING: CXL VSEC too short\n"); 1303 return -EINVAL; 1304 } 1305 1306 CXL_READ_VSEC_STATUS(dev, vsec, &adapter->vsec_status); 1307 CXL_READ_VSEC_PSL_REVISION(dev, vsec, &adapter->psl_rev); 1308 CXL_READ_VSEC_CAIA_MAJOR(dev, vsec, &adapter->caia_major); 1309 CXL_READ_VSEC_CAIA_MINOR(dev, vsec, &adapter->caia_minor); 1310 CXL_READ_VSEC_BASE_IMAGE(dev, vsec, &adapter->base_image); 1311 CXL_READ_VSEC_IMAGE_STATE(dev, vsec, &image_state); 1312 adapter->user_image_loaded = !!(image_state & CXL_VSEC_USER_IMAGE_LOADED); 1313 adapter->perst_select_user = !!(image_state & CXL_VSEC_USER_IMAGE_LOADED); 1314 adapter->perst_loads_image = !!(image_state & CXL_VSEC_PERST_LOADS_IMAGE); 1315 1316 CXL_READ_VSEC_NAFUS(dev, vsec, &adapter->slices); 1317 CXL_READ_VSEC_AFU_DESC_OFF(dev, vsec, &afu_desc_off); 1318 CXL_READ_VSEC_AFU_DESC_SIZE(dev, vsec, &afu_desc_size); 1319 CXL_READ_VSEC_PS_OFF(dev, vsec, &ps_off); 1320 CXL_READ_VSEC_PS_SIZE(dev, vsec, &ps_size); 1321 1322 /* Convert everything to bytes, because there is NO WAY I'd look at the 1323 * code a month later and forget what units these are in ;-) */ 1324 adapter->native->ps_off = ps_off * 64 * 1024; 1325 adapter->ps_size = ps_size * 64 * 1024; 1326 adapter->native->afu_desc_off = afu_desc_off * 64 * 1024; 1327 adapter->native->afu_desc_size = afu_desc_size * 64 * 1024; 1328 1329 /* Total IRQs - 1 PSL ERROR - #AFU*(1 slice error + 1 DSI) */ 1330 adapter->user_irqs = pnv_cxl_get_irq_count(dev) - 1 - 2*adapter->slices; 1331 1332 return 0; 1333 } 1334 1335 /* 1336 * Workaround a PCIe Host Bridge defect on some cards, that can cause 1337 * malformed Transaction Layer Packet (TLP) errors to be erroneously 1338 * reported. Mask this error in the Uncorrectable Error Mask Register. 1339 * 1340 * The upper nibble of the PSL revision is used to distinguish between 1341 * different cards. The affected ones have it set to 0. 1342 */ 1343 static void cxl_fixup_malformed_tlp(struct cxl *adapter, struct pci_dev *dev) 1344 { 1345 int aer; 1346 u32 data; 1347 1348 if (adapter->psl_rev & 0xf000) 1349 return; 1350 if (!(aer = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR))) 1351 return; 1352 pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_MASK, &data); 1353 if (data & PCI_ERR_UNC_MALF_TLP) 1354 if (data & PCI_ERR_UNC_INTN) 1355 return; 1356 data |= PCI_ERR_UNC_MALF_TLP; 1357 data |= PCI_ERR_UNC_INTN; 1358 pci_write_config_dword(dev, aer + PCI_ERR_UNCOR_MASK, data); 1359 } 1360 1361 static bool cxl_compatible_caia_version(struct cxl *adapter) 1362 { 1363 if (cxl_is_power8() && (adapter->caia_major == 1)) 1364 return true; 1365 1366 if (cxl_is_power9() && (adapter->caia_major == 2)) 1367 return true; 1368 1369 return false; 1370 } 1371 1372 static int cxl_vsec_looks_ok(struct cxl *adapter, struct pci_dev *dev) 1373 { 1374 if (adapter->vsec_status & CXL_STATUS_SECOND_PORT) 1375 return -EBUSY; 1376 1377 if (adapter->vsec_status & CXL_UNSUPPORTED_FEATURES) { 1378 dev_err(&dev->dev, "ABORTING: CXL requires unsupported features\n"); 1379 return -EINVAL; 1380 } 1381 1382 if (!cxl_compatible_caia_version(adapter)) { 1383 dev_info(&dev->dev, "Ignoring card. PSL type is not supported (caia version: %d)\n", 1384 adapter->caia_major); 1385 return -ENODEV; 1386 } 1387 1388 if (!adapter->slices) { 1389 /* Once we support dynamic reprogramming we can use the card if 1390 * it supports loadable AFUs */ 1391 dev_err(&dev->dev, "ABORTING: Device has no AFUs\n"); 1392 return -EINVAL; 1393 } 1394 1395 if (!adapter->native->afu_desc_off || !adapter->native->afu_desc_size) { 1396 dev_err(&dev->dev, "ABORTING: VSEC shows no AFU descriptors\n"); 1397 return -EINVAL; 1398 } 1399 1400 if (adapter->ps_size > p2_size(dev) - adapter->native->ps_off) { 1401 dev_err(&dev->dev, "ABORTING: Problem state size larger than " 1402 "available in BAR2: 0x%llx > 0x%llx\n", 1403 adapter->ps_size, p2_size(dev) - adapter->native->ps_off); 1404 return -EINVAL; 1405 } 1406 1407 return 0; 1408 } 1409 1410 ssize_t cxl_pci_read_adapter_vpd(struct cxl *adapter, void *buf, size_t len) 1411 { 1412 return pci_read_vpd(to_pci_dev(adapter->dev.parent), 0, len, buf); 1413 } 1414 1415 static void cxl_release_adapter(struct device *dev) 1416 { 1417 struct cxl *adapter = to_cxl_adapter(dev); 1418 1419 pr_devel("cxl_release_adapter\n"); 1420 1421 cxl_remove_adapter_nr(adapter); 1422 1423 kfree(adapter->native); 1424 kfree(adapter); 1425 } 1426 1427 #define CXL_PSL_ErrIVTE_tberror (0x1ull << (63-31)) 1428 1429 static int sanitise_adapter_regs(struct cxl *adapter) 1430 { 1431 int rc = 0; 1432 1433 /* Clear PSL tberror bit by writing 1 to it */ 1434 cxl_p1_write(adapter, CXL_PSL_ErrIVTE, CXL_PSL_ErrIVTE_tberror); 1435 1436 if (adapter->native->sl_ops->invalidate_all) { 1437 /* do not invalidate ERAT entries when not reloading on PERST */ 1438 if (cxl_is_power9() && (adapter->perst_loads_image)) 1439 return 0; 1440 rc = adapter->native->sl_ops->invalidate_all(adapter); 1441 } 1442 1443 return rc; 1444 } 1445 1446 /* This should contain *only* operations that can safely be done in 1447 * both creation and recovery. 1448 */ 1449 static int cxl_configure_adapter(struct cxl *adapter, struct pci_dev *dev) 1450 { 1451 int rc; 1452 1453 adapter->dev.parent = &dev->dev; 1454 adapter->dev.release = cxl_release_adapter; 1455 pci_set_drvdata(dev, adapter); 1456 1457 rc = pci_enable_device(dev); 1458 if (rc) { 1459 dev_err(&dev->dev, "pci_enable_device failed: %i\n", rc); 1460 return rc; 1461 } 1462 1463 if ((rc = cxl_read_vsec(adapter, dev))) 1464 return rc; 1465 1466 if ((rc = cxl_vsec_looks_ok(adapter, dev))) 1467 return rc; 1468 1469 cxl_fixup_malformed_tlp(adapter, dev); 1470 1471 if ((rc = setup_cxl_bars(dev))) 1472 return rc; 1473 1474 if ((rc = switch_card_to_cxl(dev))) 1475 return rc; 1476 1477 if ((rc = cxl_update_image_control(adapter))) 1478 return rc; 1479 1480 if ((rc = cxl_map_adapter_regs(adapter, dev))) 1481 return rc; 1482 1483 if ((rc = sanitise_adapter_regs(adapter))) 1484 goto err; 1485 1486 if ((rc = adapter->native->sl_ops->adapter_regs_init(adapter, dev))) 1487 goto err; 1488 1489 /* Required for devices using CAPP DMA mode, harmless for others */ 1490 pci_set_master(dev); 1491 1492 adapter->tunneled_ops_supported = false; 1493 1494 if (cxl_is_power9()) { 1495 if (pnv_pci_set_tunnel_bar(dev, 0x00020000E0000000ull, 1)) 1496 dev_info(&dev->dev, "Tunneled operations unsupported\n"); 1497 else 1498 adapter->tunneled_ops_supported = true; 1499 } 1500 1501 if ((rc = pnv_phb_to_cxl_mode(dev, adapter->native->sl_ops->capi_mode))) 1502 goto err; 1503 1504 /* If recovery happened, the last step is to turn on snooping. 1505 * In the non-recovery case this has no effect */ 1506 if ((rc = pnv_phb_to_cxl_mode(dev, OPAL_PHB_CAPI_MODE_SNOOP_ON))) 1507 goto err; 1508 1509 /* Ignore error, adapter init is not dependant on timebase sync */ 1510 cxl_setup_psl_timebase(adapter, dev); 1511 1512 if ((rc = cxl_native_register_psl_err_irq(adapter))) 1513 goto err; 1514 1515 return 0; 1516 1517 err: 1518 cxl_unmap_adapter_regs(adapter); 1519 return rc; 1520 1521 } 1522 1523 static void cxl_deconfigure_adapter(struct cxl *adapter) 1524 { 1525 struct pci_dev *pdev = to_pci_dev(adapter->dev.parent); 1526 1527 if (cxl_is_power9()) 1528 pnv_pci_set_tunnel_bar(pdev, 0x00020000E0000000ull, 0); 1529 1530 cxl_native_release_psl_err_irq(adapter); 1531 cxl_unmap_adapter_regs(adapter); 1532 1533 pci_disable_device(pdev); 1534 } 1535 1536 static void cxl_stop_trace_psl9(struct cxl *adapter) 1537 { 1538 int traceid; 1539 u64 trace_state, trace_mask; 1540 struct pci_dev *dev = to_pci_dev(adapter->dev.parent); 1541 1542 /* read each tracearray state and issue mmio to stop them is needed */ 1543 for (traceid = 0; traceid <= CXL_PSL9_TRACEID_MAX; ++traceid) { 1544 trace_state = cxl_p1_read(adapter, CXL_PSL9_CTCCFG); 1545 trace_mask = (0x3ULL << (62 - traceid * 2)); 1546 trace_state = (trace_state & trace_mask) >> (62 - traceid * 2); 1547 dev_dbg(&dev->dev, "cxl: Traceid-%d trace_state=0x%0llX\n", 1548 traceid, trace_state); 1549 1550 /* issue mmio if the trace array isn't in FIN state */ 1551 if (trace_state != CXL_PSL9_TRACESTATE_FIN) 1552 cxl_p1_write(adapter, CXL_PSL9_TRACECFG, 1553 0x8400000000000000ULL | traceid); 1554 } 1555 } 1556 1557 static void cxl_stop_trace_psl8(struct cxl *adapter) 1558 { 1559 int slice; 1560 1561 /* Stop the trace */ 1562 cxl_p1_write(adapter, CXL_PSL_TRACE, 0x8000000000000017LL); 1563 1564 /* Stop the slice traces */ 1565 spin_lock(&adapter->afu_list_lock); 1566 for (slice = 0; slice < adapter->slices; slice++) { 1567 if (adapter->afu[slice]) 1568 cxl_p1n_write(adapter->afu[slice], CXL_PSL_SLICE_TRACE, 1569 0x8000000000000000LL); 1570 } 1571 spin_unlock(&adapter->afu_list_lock); 1572 } 1573 1574 static const struct cxl_service_layer_ops psl9_ops = { 1575 .adapter_regs_init = init_implementation_adapter_regs_psl9, 1576 .invalidate_all = cxl_invalidate_all_psl9, 1577 .afu_regs_init = init_implementation_afu_regs_psl9, 1578 .sanitise_afu_regs = sanitise_afu_regs_psl9, 1579 .register_serr_irq = cxl_native_register_serr_irq, 1580 .release_serr_irq = cxl_native_release_serr_irq, 1581 .handle_interrupt = cxl_irq_psl9, 1582 .fail_irq = cxl_fail_irq_psl, 1583 .activate_dedicated_process = cxl_activate_dedicated_process_psl9, 1584 .attach_afu_directed = cxl_attach_afu_directed_psl9, 1585 .attach_dedicated_process = cxl_attach_dedicated_process_psl9, 1586 .update_dedicated_ivtes = cxl_update_dedicated_ivtes_psl9, 1587 .debugfs_add_adapter_regs = cxl_debugfs_add_adapter_regs_psl9, 1588 .debugfs_add_afu_regs = cxl_debugfs_add_afu_regs_psl9, 1589 .psl_irq_dump_registers = cxl_native_irq_dump_regs_psl9, 1590 .err_irq_dump_registers = cxl_native_err_irq_dump_regs_psl9, 1591 .debugfs_stop_trace = cxl_stop_trace_psl9, 1592 .timebase_read = timebase_read_psl9, 1593 .capi_mode = OPAL_PHB_CAPI_MODE_CAPI, 1594 .needs_reset_before_disable = true, 1595 }; 1596 1597 static const struct cxl_service_layer_ops psl8_ops = { 1598 .adapter_regs_init = init_implementation_adapter_regs_psl8, 1599 .invalidate_all = cxl_invalidate_all_psl8, 1600 .afu_regs_init = init_implementation_afu_regs_psl8, 1601 .sanitise_afu_regs = sanitise_afu_regs_psl8, 1602 .register_serr_irq = cxl_native_register_serr_irq, 1603 .release_serr_irq = cxl_native_release_serr_irq, 1604 .handle_interrupt = cxl_irq_psl8, 1605 .fail_irq = cxl_fail_irq_psl, 1606 .activate_dedicated_process = cxl_activate_dedicated_process_psl8, 1607 .attach_afu_directed = cxl_attach_afu_directed_psl8, 1608 .attach_dedicated_process = cxl_attach_dedicated_process_psl8, 1609 .update_dedicated_ivtes = cxl_update_dedicated_ivtes_psl8, 1610 .debugfs_add_adapter_regs = cxl_debugfs_add_adapter_regs_psl8, 1611 .debugfs_add_afu_regs = cxl_debugfs_add_afu_regs_psl8, 1612 .psl_irq_dump_registers = cxl_native_irq_dump_regs_psl8, 1613 .err_irq_dump_registers = cxl_native_err_irq_dump_regs_psl8, 1614 .debugfs_stop_trace = cxl_stop_trace_psl8, 1615 .write_timebase_ctrl = write_timebase_ctrl_psl8, 1616 .timebase_read = timebase_read_psl8, 1617 .capi_mode = OPAL_PHB_CAPI_MODE_CAPI, 1618 .needs_reset_before_disable = true, 1619 }; 1620 1621 static void set_sl_ops(struct cxl *adapter, struct pci_dev *dev) 1622 { 1623 if (cxl_is_power8()) { 1624 dev_info(&dev->dev, "Device uses a PSL8\n"); 1625 adapter->native->sl_ops = &psl8_ops; 1626 } else { 1627 dev_info(&dev->dev, "Device uses a PSL9\n"); 1628 adapter->native->sl_ops = &psl9_ops; 1629 } 1630 } 1631 1632 1633 static struct cxl *cxl_pci_init_adapter(struct pci_dev *dev) 1634 { 1635 struct cxl *adapter; 1636 int rc; 1637 1638 adapter = cxl_alloc_adapter(); 1639 if (!adapter) 1640 return ERR_PTR(-ENOMEM); 1641 1642 adapter->native = kzalloc(sizeof(struct cxl_native), GFP_KERNEL); 1643 if (!adapter->native) { 1644 rc = -ENOMEM; 1645 goto err_release; 1646 } 1647 1648 set_sl_ops(adapter, dev); 1649 1650 /* Set defaults for parameters which need to persist over 1651 * configure/reconfigure 1652 */ 1653 adapter->perst_loads_image = true; 1654 adapter->perst_same_image = false; 1655 1656 rc = cxl_configure_adapter(adapter, dev); 1657 if (rc) { 1658 pci_disable_device(dev); 1659 goto err_release; 1660 } 1661 1662 /* Don't care if this one fails: */ 1663 cxl_debugfs_adapter_add(adapter); 1664 1665 /* 1666 * After we call this function we must not free the adapter directly, 1667 * even if it returns an error! 1668 */ 1669 if ((rc = cxl_register_adapter(adapter))) 1670 goto err_put1; 1671 1672 if ((rc = cxl_sysfs_adapter_add(adapter))) 1673 goto err_put1; 1674 1675 /* Release the context lock as adapter is configured */ 1676 cxl_adapter_context_unlock(adapter); 1677 1678 return adapter; 1679 1680 err_put1: 1681 /* This should mirror cxl_remove_adapter, except without the 1682 * sysfs parts 1683 */ 1684 cxl_debugfs_adapter_remove(adapter); 1685 cxl_deconfigure_adapter(adapter); 1686 device_unregister(&adapter->dev); 1687 return ERR_PTR(rc); 1688 1689 err_release: 1690 cxl_release_adapter(&adapter->dev); 1691 return ERR_PTR(rc); 1692 } 1693 1694 static void cxl_pci_remove_adapter(struct cxl *adapter) 1695 { 1696 pr_devel("cxl_remove_adapter\n"); 1697 1698 cxl_sysfs_adapter_remove(adapter); 1699 cxl_debugfs_adapter_remove(adapter); 1700 1701 /* 1702 * Flush adapter datacache as its about to be removed. 1703 */ 1704 cxl_data_cache_flush(adapter); 1705 1706 cxl_deconfigure_adapter(adapter); 1707 1708 device_unregister(&adapter->dev); 1709 } 1710 1711 #define CXL_MAX_PCIEX_PARENT 2 1712 1713 int cxl_slot_is_switched(struct pci_dev *dev) 1714 { 1715 struct device_node *np; 1716 int depth = 0; 1717 1718 if (!(np = pci_device_to_OF_node(dev))) { 1719 pr_err("cxl: np = NULL\n"); 1720 return -ENODEV; 1721 } 1722 of_node_get(np); 1723 while (np) { 1724 np = of_get_next_parent(np); 1725 if (!of_node_is_type(np, "pciex")) 1726 break; 1727 depth++; 1728 } 1729 of_node_put(np); 1730 return (depth > CXL_MAX_PCIEX_PARENT); 1731 } 1732 1733 static int cxl_probe(struct pci_dev *dev, const struct pci_device_id *id) 1734 { 1735 struct cxl *adapter; 1736 int slice; 1737 int rc; 1738 1739 if (cxl_pci_is_vphb_device(dev)) { 1740 dev_dbg(&dev->dev, "cxl_init_adapter: Ignoring cxl vphb device\n"); 1741 return -ENODEV; 1742 } 1743 1744 if (cxl_slot_is_switched(dev)) { 1745 dev_info(&dev->dev, "Ignoring card on incompatible PCI slot\n"); 1746 return -ENODEV; 1747 } 1748 1749 if (cxl_is_power9() && !radix_enabled()) { 1750 dev_info(&dev->dev, "Only Radix mode supported\n"); 1751 return -ENODEV; 1752 } 1753 1754 if (cxl_verbose) 1755 dump_cxl_config_space(dev); 1756 1757 adapter = cxl_pci_init_adapter(dev); 1758 if (IS_ERR(adapter)) { 1759 dev_err(&dev->dev, "cxl_init_adapter failed: %li\n", PTR_ERR(adapter)); 1760 return PTR_ERR(adapter); 1761 } 1762 1763 for (slice = 0; slice < adapter->slices; slice++) { 1764 if ((rc = pci_init_afu(adapter, slice, dev))) { 1765 dev_err(&dev->dev, "AFU %i failed to initialise: %i\n", slice, rc); 1766 continue; 1767 } 1768 1769 rc = cxl_afu_select_best_mode(adapter->afu[slice]); 1770 if (rc) 1771 dev_err(&dev->dev, "AFU %i failed to start: %i\n", slice, rc); 1772 } 1773 1774 return 0; 1775 } 1776 1777 static void cxl_remove(struct pci_dev *dev) 1778 { 1779 struct cxl *adapter = pci_get_drvdata(dev); 1780 struct cxl_afu *afu; 1781 int i; 1782 1783 /* 1784 * Lock to prevent someone grabbing a ref through the adapter list as 1785 * we are removing it 1786 */ 1787 for (i = 0; i < adapter->slices; i++) { 1788 afu = adapter->afu[i]; 1789 cxl_pci_remove_afu(afu); 1790 } 1791 cxl_pci_remove_adapter(adapter); 1792 } 1793 1794 static pci_ers_result_t cxl_vphb_error_detected(struct cxl_afu *afu, 1795 pci_channel_state_t state) 1796 { 1797 struct pci_dev *afu_dev; 1798 pci_ers_result_t result = PCI_ERS_RESULT_NEED_RESET; 1799 pci_ers_result_t afu_result = PCI_ERS_RESULT_NEED_RESET; 1800 1801 /* There should only be one entry, but go through the list 1802 * anyway 1803 */ 1804 if (afu == NULL || afu->phb == NULL) 1805 return result; 1806 1807 list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) { 1808 if (!afu_dev->driver) 1809 continue; 1810 1811 afu_dev->error_state = state; 1812 1813 if (afu_dev->driver->err_handler) 1814 afu_result = afu_dev->driver->err_handler->error_detected(afu_dev, 1815 state); 1816 /* Disconnect trumps all, NONE trumps NEED_RESET */ 1817 if (afu_result == PCI_ERS_RESULT_DISCONNECT) 1818 result = PCI_ERS_RESULT_DISCONNECT; 1819 else if ((afu_result == PCI_ERS_RESULT_NONE) && 1820 (result == PCI_ERS_RESULT_NEED_RESET)) 1821 result = PCI_ERS_RESULT_NONE; 1822 } 1823 return result; 1824 } 1825 1826 static pci_ers_result_t cxl_pci_error_detected(struct pci_dev *pdev, 1827 pci_channel_state_t state) 1828 { 1829 struct cxl *adapter = pci_get_drvdata(pdev); 1830 struct cxl_afu *afu; 1831 pci_ers_result_t result = PCI_ERS_RESULT_NEED_RESET; 1832 pci_ers_result_t afu_result = PCI_ERS_RESULT_NEED_RESET; 1833 int i; 1834 1835 /* At this point, we could still have an interrupt pending. 1836 * Let's try to get them out of the way before they do 1837 * anything we don't like. 1838 */ 1839 schedule(); 1840 1841 /* If we're permanently dead, give up. */ 1842 if (state == pci_channel_io_perm_failure) { 1843 spin_lock(&adapter->afu_list_lock); 1844 for (i = 0; i < adapter->slices; i++) { 1845 afu = adapter->afu[i]; 1846 /* 1847 * Tell the AFU drivers; but we don't care what they 1848 * say, we're going away. 1849 */ 1850 cxl_vphb_error_detected(afu, state); 1851 } 1852 spin_unlock(&adapter->afu_list_lock); 1853 return PCI_ERS_RESULT_DISCONNECT; 1854 } 1855 1856 /* Are we reflashing? 1857 * 1858 * If we reflash, we could come back as something entirely 1859 * different, including a non-CAPI card. As such, by default 1860 * we don't participate in the process. We'll be unbound and 1861 * the slot re-probed. (TODO: check EEH doesn't blindly rebind 1862 * us!) 1863 * 1864 * However, this isn't the entire story: for reliablity 1865 * reasons, we usually want to reflash the FPGA on PERST in 1866 * order to get back to a more reliable known-good state. 1867 * 1868 * This causes us a bit of a problem: if we reflash we can't 1869 * trust that we'll come back the same - we could have a new 1870 * image and been PERSTed in order to load that 1871 * image. However, most of the time we actually *will* come 1872 * back the same - for example a regular EEH event. 1873 * 1874 * Therefore, we allow the user to assert that the image is 1875 * indeed the same and that we should continue on into EEH 1876 * anyway. 1877 */ 1878 if (adapter->perst_loads_image && !adapter->perst_same_image) { 1879 /* TODO take the PHB out of CXL mode */ 1880 dev_info(&pdev->dev, "reflashing, so opting out of EEH!\n"); 1881 return PCI_ERS_RESULT_NONE; 1882 } 1883 1884 /* 1885 * At this point, we want to try to recover. We'll always 1886 * need a complete slot reset: we don't trust any other reset. 1887 * 1888 * Now, we go through each AFU: 1889 * - We send the driver, if bound, an error_detected callback. 1890 * We expect it to clean up, but it can also tell us to give 1891 * up and permanently detach the card. To simplify things, if 1892 * any bound AFU driver doesn't support EEH, we give up on EEH. 1893 * 1894 * - We detach all contexts associated with the AFU. This 1895 * does not free them, but puts them into a CLOSED state 1896 * which causes any the associated files to return useful 1897 * errors to userland. It also unmaps, but does not free, 1898 * any IRQs. 1899 * 1900 * - We clean up our side: releasing and unmapping resources we hold 1901 * so we can wire them up again when the hardware comes back up. 1902 * 1903 * Driver authors should note: 1904 * 1905 * - Any contexts you create in your kernel driver (except 1906 * those associated with anonymous file descriptors) are 1907 * your responsibility to free and recreate. Likewise with 1908 * any attached resources. 1909 * 1910 * - We will take responsibility for re-initialising the 1911 * device context (the one set up for you in 1912 * cxl_pci_enable_device_hook and accessed through 1913 * cxl_get_context). If you've attached IRQs or other 1914 * resources to it, they remains yours to free. 1915 * 1916 * You can call the same functions to release resources as you 1917 * normally would: we make sure that these functions continue 1918 * to work when the hardware is down. 1919 * 1920 * Two examples: 1921 * 1922 * 1) If you normally free all your resources at the end of 1923 * each request, or if you use anonymous FDs, your 1924 * error_detected callback can simply set a flag to tell 1925 * your driver not to start any new calls. You can then 1926 * clear the flag in the resume callback. 1927 * 1928 * 2) If you normally allocate your resources on startup: 1929 * * Set a flag in error_detected as above. 1930 * * Let CXL detach your contexts. 1931 * * In slot_reset, free the old resources and allocate new ones. 1932 * * In resume, clear the flag to allow things to start. 1933 */ 1934 1935 /* Make sure no one else changes the afu list */ 1936 spin_lock(&adapter->afu_list_lock); 1937 1938 for (i = 0; i < adapter->slices; i++) { 1939 afu = adapter->afu[i]; 1940 1941 if (afu == NULL) 1942 continue; 1943 1944 afu_result = cxl_vphb_error_detected(afu, state); 1945 cxl_context_detach_all(afu); 1946 cxl_ops->afu_deactivate_mode(afu, afu->current_mode); 1947 pci_deconfigure_afu(afu); 1948 1949 /* Disconnect trumps all, NONE trumps NEED_RESET */ 1950 if (afu_result == PCI_ERS_RESULT_DISCONNECT) 1951 result = PCI_ERS_RESULT_DISCONNECT; 1952 else if ((afu_result == PCI_ERS_RESULT_NONE) && 1953 (result == PCI_ERS_RESULT_NEED_RESET)) 1954 result = PCI_ERS_RESULT_NONE; 1955 } 1956 spin_unlock(&adapter->afu_list_lock); 1957 1958 /* should take the context lock here */ 1959 if (cxl_adapter_context_lock(adapter) != 0) 1960 dev_warn(&adapter->dev, 1961 "Couldn't take context lock with %d active-contexts\n", 1962 atomic_read(&adapter->contexts_num)); 1963 1964 cxl_deconfigure_adapter(adapter); 1965 1966 return result; 1967 } 1968 1969 static pci_ers_result_t cxl_pci_slot_reset(struct pci_dev *pdev) 1970 { 1971 struct cxl *adapter = pci_get_drvdata(pdev); 1972 struct cxl_afu *afu; 1973 struct cxl_context *ctx; 1974 struct pci_dev *afu_dev; 1975 pci_ers_result_t afu_result = PCI_ERS_RESULT_RECOVERED; 1976 pci_ers_result_t result = PCI_ERS_RESULT_RECOVERED; 1977 int i; 1978 1979 if (cxl_configure_adapter(adapter, pdev)) 1980 goto err; 1981 1982 /* 1983 * Unlock context activation for the adapter. Ideally this should be 1984 * done in cxl_pci_resume but cxlflash module tries to activate the 1985 * master context as part of slot_reset callback. 1986 */ 1987 cxl_adapter_context_unlock(adapter); 1988 1989 spin_lock(&adapter->afu_list_lock); 1990 for (i = 0; i < adapter->slices; i++) { 1991 afu = adapter->afu[i]; 1992 1993 if (afu == NULL) 1994 continue; 1995 1996 if (pci_configure_afu(afu, adapter, pdev)) 1997 goto err_unlock; 1998 1999 if (cxl_afu_select_best_mode(afu)) 2000 goto err_unlock; 2001 2002 if (afu->phb == NULL) 2003 continue; 2004 2005 list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) { 2006 /* Reset the device context. 2007 * TODO: make this less disruptive 2008 */ 2009 ctx = cxl_get_context(afu_dev); 2010 2011 if (ctx && cxl_release_context(ctx)) 2012 goto err_unlock; 2013 2014 ctx = cxl_dev_context_init(afu_dev); 2015 if (IS_ERR(ctx)) 2016 goto err_unlock; 2017 2018 afu_dev->dev.archdata.cxl_ctx = ctx; 2019 2020 if (cxl_ops->afu_check_and_enable(afu)) 2021 goto err_unlock; 2022 2023 afu_dev->error_state = pci_channel_io_normal; 2024 2025 /* If there's a driver attached, allow it to 2026 * chime in on recovery. Drivers should check 2027 * if everything has come back OK, but 2028 * shouldn't start new work until we call 2029 * their resume function. 2030 */ 2031 if (!afu_dev->driver) 2032 continue; 2033 2034 if (afu_dev->driver->err_handler && 2035 afu_dev->driver->err_handler->slot_reset) 2036 afu_result = afu_dev->driver->err_handler->slot_reset(afu_dev); 2037 2038 if (afu_result == PCI_ERS_RESULT_DISCONNECT) 2039 result = PCI_ERS_RESULT_DISCONNECT; 2040 } 2041 } 2042 2043 spin_unlock(&adapter->afu_list_lock); 2044 return result; 2045 2046 err_unlock: 2047 spin_unlock(&adapter->afu_list_lock); 2048 2049 err: 2050 /* All the bits that happen in both error_detected and cxl_remove 2051 * should be idempotent, so we don't need to worry about leaving a mix 2052 * of unconfigured and reconfigured resources. 2053 */ 2054 dev_err(&pdev->dev, "EEH recovery failed. Asking to be disconnected.\n"); 2055 return PCI_ERS_RESULT_DISCONNECT; 2056 } 2057 2058 static void cxl_pci_resume(struct pci_dev *pdev) 2059 { 2060 struct cxl *adapter = pci_get_drvdata(pdev); 2061 struct cxl_afu *afu; 2062 struct pci_dev *afu_dev; 2063 int i; 2064 2065 /* Everything is back now. Drivers should restart work now. 2066 * This is not the place to be checking if everything came back up 2067 * properly, because there's no return value: do that in slot_reset. 2068 */ 2069 spin_lock(&adapter->afu_list_lock); 2070 for (i = 0; i < adapter->slices; i++) { 2071 afu = adapter->afu[i]; 2072 2073 if (afu == NULL || afu->phb == NULL) 2074 continue; 2075 2076 list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) { 2077 if (afu_dev->driver && afu_dev->driver->err_handler && 2078 afu_dev->driver->err_handler->resume) 2079 afu_dev->driver->err_handler->resume(afu_dev); 2080 } 2081 } 2082 spin_unlock(&adapter->afu_list_lock); 2083 } 2084 2085 static const struct pci_error_handlers cxl_err_handler = { 2086 .error_detected = cxl_pci_error_detected, 2087 .slot_reset = cxl_pci_slot_reset, 2088 .resume = cxl_pci_resume, 2089 }; 2090 2091 struct pci_driver cxl_pci_driver = { 2092 .name = "cxl-pci", 2093 .id_table = cxl_pci_tbl, 2094 .probe = cxl_probe, 2095 .remove = cxl_remove, 2096 .shutdown = cxl_remove, 2097 .err_handler = &cxl_err_handler, 2098 }; 2099