1 /* 2 * Copyright 2014 IBM Corp. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 */ 9 10 #include <linux/pci_regs.h> 11 #include <linux/pci_ids.h> 12 #include <linux/device.h> 13 #include <linux/module.h> 14 #include <linux/kernel.h> 15 #include <linux/slab.h> 16 #include <linux/sort.h> 17 #include <linux/pci.h> 18 #include <linux/of.h> 19 #include <linux/delay.h> 20 #include <asm/opal.h> 21 #include <asm/msi_bitmap.h> 22 #include <asm/pnv-pci.h> 23 #include <asm/io.h> 24 #include <asm/reg.h> 25 26 #include "cxl.h" 27 #include <misc/cxl.h> 28 29 30 #define CXL_PCI_VSEC_ID 0x1280 31 #define CXL_VSEC_MIN_SIZE 0x80 32 33 #define CXL_READ_VSEC_LENGTH(dev, vsec, dest) \ 34 { \ 35 pci_read_config_word(dev, vsec + 0x6, dest); \ 36 *dest >>= 4; \ 37 } 38 #define CXL_READ_VSEC_NAFUS(dev, vsec, dest) \ 39 pci_read_config_byte(dev, vsec + 0x8, dest) 40 41 #define CXL_READ_VSEC_STATUS(dev, vsec, dest) \ 42 pci_read_config_byte(dev, vsec + 0x9, dest) 43 #define CXL_STATUS_SECOND_PORT 0x80 44 #define CXL_STATUS_MSI_X_FULL 0x40 45 #define CXL_STATUS_MSI_X_SINGLE 0x20 46 #define CXL_STATUS_FLASH_RW 0x08 47 #define CXL_STATUS_FLASH_RO 0x04 48 #define CXL_STATUS_LOADABLE_AFU 0x02 49 #define CXL_STATUS_LOADABLE_PSL 0x01 50 /* If we see these features we won't try to use the card */ 51 #define CXL_UNSUPPORTED_FEATURES \ 52 (CXL_STATUS_MSI_X_FULL | CXL_STATUS_MSI_X_SINGLE) 53 54 #define CXL_READ_VSEC_MODE_CONTROL(dev, vsec, dest) \ 55 pci_read_config_byte(dev, vsec + 0xa, dest) 56 #define CXL_WRITE_VSEC_MODE_CONTROL(dev, vsec, val) \ 57 pci_write_config_byte(dev, vsec + 0xa, val) 58 #define CXL_WRITE_VSEC_MODE_CONTROL_BUS(bus, devfn, vsec, val) \ 59 pci_bus_write_config_byte(bus, devfn, vsec + 0xa, val) 60 #define CXL_VSEC_PROTOCOL_MASK 0xe0 61 #define CXL_VSEC_PROTOCOL_1024TB 0x80 62 #define CXL_VSEC_PROTOCOL_512TB 0x40 63 #define CXL_VSEC_PROTOCOL_256TB 0x20 /* Power 8 uses this */ 64 #define CXL_VSEC_PROTOCOL_ENABLE 0x01 65 66 #define CXL_READ_VSEC_PSL_REVISION(dev, vsec, dest) \ 67 pci_read_config_word(dev, vsec + 0xc, dest) 68 #define CXL_READ_VSEC_CAIA_MINOR(dev, vsec, dest) \ 69 pci_read_config_byte(dev, vsec + 0xe, dest) 70 #define CXL_READ_VSEC_CAIA_MAJOR(dev, vsec, dest) \ 71 pci_read_config_byte(dev, vsec + 0xf, dest) 72 #define CXL_READ_VSEC_BASE_IMAGE(dev, vsec, dest) \ 73 pci_read_config_word(dev, vsec + 0x10, dest) 74 75 #define CXL_READ_VSEC_IMAGE_STATE(dev, vsec, dest) \ 76 pci_read_config_byte(dev, vsec + 0x13, dest) 77 #define CXL_WRITE_VSEC_IMAGE_STATE(dev, vsec, val) \ 78 pci_write_config_byte(dev, vsec + 0x13, val) 79 #define CXL_VSEC_USER_IMAGE_LOADED 0x80 /* RO */ 80 #define CXL_VSEC_PERST_LOADS_IMAGE 0x20 /* RW */ 81 #define CXL_VSEC_PERST_SELECT_USER 0x10 /* RW */ 82 83 #define CXL_READ_VSEC_AFU_DESC_OFF(dev, vsec, dest) \ 84 pci_read_config_dword(dev, vsec + 0x20, dest) 85 #define CXL_READ_VSEC_AFU_DESC_SIZE(dev, vsec, dest) \ 86 pci_read_config_dword(dev, vsec + 0x24, dest) 87 #define CXL_READ_VSEC_PS_OFF(dev, vsec, dest) \ 88 pci_read_config_dword(dev, vsec + 0x28, dest) 89 #define CXL_READ_VSEC_PS_SIZE(dev, vsec, dest) \ 90 pci_read_config_dword(dev, vsec + 0x2c, dest) 91 92 93 /* This works a little different than the p1/p2 register accesses to make it 94 * easier to pull out individual fields */ 95 #define AFUD_READ(afu, off) in_be64(afu->native->afu_desc_mmio + off) 96 #define AFUD_READ_LE(afu, off) in_le64(afu->native->afu_desc_mmio + off) 97 #define EXTRACT_PPC_BIT(val, bit) (!!(val & PPC_BIT(bit))) 98 #define EXTRACT_PPC_BITS(val, bs, be) ((val & PPC_BITMASK(bs, be)) >> PPC_BITLSHIFT(be)) 99 100 #define AFUD_READ_INFO(afu) AFUD_READ(afu, 0x0) 101 #define AFUD_NUM_INTS_PER_PROC(val) EXTRACT_PPC_BITS(val, 0, 15) 102 #define AFUD_NUM_PROCS(val) EXTRACT_PPC_BITS(val, 16, 31) 103 #define AFUD_NUM_CRS(val) EXTRACT_PPC_BITS(val, 32, 47) 104 #define AFUD_MULTIMODE(val) EXTRACT_PPC_BIT(val, 48) 105 #define AFUD_PUSH_BLOCK_TRANSFER(val) EXTRACT_PPC_BIT(val, 55) 106 #define AFUD_DEDICATED_PROCESS(val) EXTRACT_PPC_BIT(val, 59) 107 #define AFUD_AFU_DIRECTED(val) EXTRACT_PPC_BIT(val, 61) 108 #define AFUD_TIME_SLICED(val) EXTRACT_PPC_BIT(val, 63) 109 #define AFUD_READ_CR(afu) AFUD_READ(afu, 0x20) 110 #define AFUD_CR_LEN(val) EXTRACT_PPC_BITS(val, 8, 63) 111 #define AFUD_READ_CR_OFF(afu) AFUD_READ(afu, 0x28) 112 #define AFUD_READ_PPPSA(afu) AFUD_READ(afu, 0x30) 113 #define AFUD_PPPSA_PP(val) EXTRACT_PPC_BIT(val, 6) 114 #define AFUD_PPPSA_PSA(val) EXTRACT_PPC_BIT(val, 7) 115 #define AFUD_PPPSA_LEN(val) EXTRACT_PPC_BITS(val, 8, 63) 116 #define AFUD_READ_PPPSA_OFF(afu) AFUD_READ(afu, 0x38) 117 #define AFUD_READ_EB(afu) AFUD_READ(afu, 0x40) 118 #define AFUD_EB_LEN(val) EXTRACT_PPC_BITS(val, 8, 63) 119 #define AFUD_READ_EB_OFF(afu) AFUD_READ(afu, 0x48) 120 121 static const struct pci_device_id cxl_pci_tbl[] = { 122 { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x0477), }, 123 { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x044b), }, 124 { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x04cf), }, 125 { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x0601), }, 126 { PCI_DEVICE_CLASS(0x120000, ~0), }, 127 128 { } 129 }; 130 MODULE_DEVICE_TABLE(pci, cxl_pci_tbl); 131 132 133 /* 134 * Mostly using these wrappers to avoid confusion: 135 * priv 1 is BAR2, while priv 2 is BAR0 136 */ 137 static inline resource_size_t p1_base(struct pci_dev *dev) 138 { 139 return pci_resource_start(dev, 2); 140 } 141 142 static inline resource_size_t p1_size(struct pci_dev *dev) 143 { 144 return pci_resource_len(dev, 2); 145 } 146 147 static inline resource_size_t p2_base(struct pci_dev *dev) 148 { 149 return pci_resource_start(dev, 0); 150 } 151 152 static inline resource_size_t p2_size(struct pci_dev *dev) 153 { 154 return pci_resource_len(dev, 0); 155 } 156 157 static int find_cxl_vsec(struct pci_dev *dev) 158 { 159 int vsec = 0; 160 u16 val; 161 162 while ((vsec = pci_find_next_ext_capability(dev, vsec, PCI_EXT_CAP_ID_VNDR))) { 163 pci_read_config_word(dev, vsec + 0x4, &val); 164 if (val == CXL_PCI_VSEC_ID) 165 return vsec; 166 } 167 return 0; 168 169 } 170 171 static void dump_cxl_config_space(struct pci_dev *dev) 172 { 173 int vsec; 174 u32 val; 175 176 dev_info(&dev->dev, "dump_cxl_config_space\n"); 177 178 pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &val); 179 dev_info(&dev->dev, "BAR0: %#.8x\n", val); 180 pci_read_config_dword(dev, PCI_BASE_ADDRESS_1, &val); 181 dev_info(&dev->dev, "BAR1: %#.8x\n", val); 182 pci_read_config_dword(dev, PCI_BASE_ADDRESS_2, &val); 183 dev_info(&dev->dev, "BAR2: %#.8x\n", val); 184 pci_read_config_dword(dev, PCI_BASE_ADDRESS_3, &val); 185 dev_info(&dev->dev, "BAR3: %#.8x\n", val); 186 pci_read_config_dword(dev, PCI_BASE_ADDRESS_4, &val); 187 dev_info(&dev->dev, "BAR4: %#.8x\n", val); 188 pci_read_config_dword(dev, PCI_BASE_ADDRESS_5, &val); 189 dev_info(&dev->dev, "BAR5: %#.8x\n", val); 190 191 dev_info(&dev->dev, "p1 regs: %#llx, len: %#llx\n", 192 p1_base(dev), p1_size(dev)); 193 dev_info(&dev->dev, "p2 regs: %#llx, len: %#llx\n", 194 p2_base(dev), p2_size(dev)); 195 dev_info(&dev->dev, "BAR 4/5: %#llx, len: %#llx\n", 196 pci_resource_start(dev, 4), pci_resource_len(dev, 4)); 197 198 if (!(vsec = find_cxl_vsec(dev))) 199 return; 200 201 #define show_reg(name, what) \ 202 dev_info(&dev->dev, "cxl vsec: %30s: %#x\n", name, what) 203 204 pci_read_config_dword(dev, vsec + 0x0, &val); 205 show_reg("Cap ID", (val >> 0) & 0xffff); 206 show_reg("Cap Ver", (val >> 16) & 0xf); 207 show_reg("Next Cap Ptr", (val >> 20) & 0xfff); 208 pci_read_config_dword(dev, vsec + 0x4, &val); 209 show_reg("VSEC ID", (val >> 0) & 0xffff); 210 show_reg("VSEC Rev", (val >> 16) & 0xf); 211 show_reg("VSEC Length", (val >> 20) & 0xfff); 212 pci_read_config_dword(dev, vsec + 0x8, &val); 213 show_reg("Num AFUs", (val >> 0) & 0xff); 214 show_reg("Status", (val >> 8) & 0xff); 215 show_reg("Mode Control", (val >> 16) & 0xff); 216 show_reg("Reserved", (val >> 24) & 0xff); 217 pci_read_config_dword(dev, vsec + 0xc, &val); 218 show_reg("PSL Rev", (val >> 0) & 0xffff); 219 show_reg("CAIA Ver", (val >> 16) & 0xffff); 220 pci_read_config_dword(dev, vsec + 0x10, &val); 221 show_reg("Base Image Rev", (val >> 0) & 0xffff); 222 show_reg("Reserved", (val >> 16) & 0x0fff); 223 show_reg("Image Control", (val >> 28) & 0x3); 224 show_reg("Reserved", (val >> 30) & 0x1); 225 show_reg("Image Loaded", (val >> 31) & 0x1); 226 227 pci_read_config_dword(dev, vsec + 0x14, &val); 228 show_reg("Reserved", val); 229 pci_read_config_dword(dev, vsec + 0x18, &val); 230 show_reg("Reserved", val); 231 pci_read_config_dword(dev, vsec + 0x1c, &val); 232 show_reg("Reserved", val); 233 234 pci_read_config_dword(dev, vsec + 0x20, &val); 235 show_reg("AFU Descriptor Offset", val); 236 pci_read_config_dword(dev, vsec + 0x24, &val); 237 show_reg("AFU Descriptor Size", val); 238 pci_read_config_dword(dev, vsec + 0x28, &val); 239 show_reg("Problem State Offset", val); 240 pci_read_config_dword(dev, vsec + 0x2c, &val); 241 show_reg("Problem State Size", val); 242 243 pci_read_config_dword(dev, vsec + 0x30, &val); 244 show_reg("Reserved", val); 245 pci_read_config_dword(dev, vsec + 0x34, &val); 246 show_reg("Reserved", val); 247 pci_read_config_dword(dev, vsec + 0x38, &val); 248 show_reg("Reserved", val); 249 pci_read_config_dword(dev, vsec + 0x3c, &val); 250 show_reg("Reserved", val); 251 252 pci_read_config_dword(dev, vsec + 0x40, &val); 253 show_reg("PSL Programming Port", val); 254 pci_read_config_dword(dev, vsec + 0x44, &val); 255 show_reg("PSL Programming Control", val); 256 257 pci_read_config_dword(dev, vsec + 0x48, &val); 258 show_reg("Reserved", val); 259 pci_read_config_dword(dev, vsec + 0x4c, &val); 260 show_reg("Reserved", val); 261 262 pci_read_config_dword(dev, vsec + 0x50, &val); 263 show_reg("Flash Address Register", val); 264 pci_read_config_dword(dev, vsec + 0x54, &val); 265 show_reg("Flash Size Register", val); 266 pci_read_config_dword(dev, vsec + 0x58, &val); 267 show_reg("Flash Status/Control Register", val); 268 pci_read_config_dword(dev, vsec + 0x58, &val); 269 show_reg("Flash Data Port", val); 270 271 #undef show_reg 272 } 273 274 static void dump_afu_descriptor(struct cxl_afu *afu) 275 { 276 u64 val, afu_cr_num, afu_cr_off, afu_cr_len; 277 int i; 278 279 #define show_reg(name, what) \ 280 dev_info(&afu->dev, "afu desc: %30s: %#llx\n", name, what) 281 282 val = AFUD_READ_INFO(afu); 283 show_reg("num_ints_per_process", AFUD_NUM_INTS_PER_PROC(val)); 284 show_reg("num_of_processes", AFUD_NUM_PROCS(val)); 285 show_reg("num_of_afu_CRs", AFUD_NUM_CRS(val)); 286 show_reg("req_prog_mode", val & 0xffffULL); 287 afu_cr_num = AFUD_NUM_CRS(val); 288 289 val = AFUD_READ(afu, 0x8); 290 show_reg("Reserved", val); 291 val = AFUD_READ(afu, 0x10); 292 show_reg("Reserved", val); 293 val = AFUD_READ(afu, 0x18); 294 show_reg("Reserved", val); 295 296 val = AFUD_READ_CR(afu); 297 show_reg("Reserved", (val >> (63-7)) & 0xff); 298 show_reg("AFU_CR_len", AFUD_CR_LEN(val)); 299 afu_cr_len = AFUD_CR_LEN(val) * 256; 300 301 val = AFUD_READ_CR_OFF(afu); 302 afu_cr_off = val; 303 show_reg("AFU_CR_offset", val); 304 305 val = AFUD_READ_PPPSA(afu); 306 show_reg("PerProcessPSA_control", (val >> (63-7)) & 0xff); 307 show_reg("PerProcessPSA Length", AFUD_PPPSA_LEN(val)); 308 309 val = AFUD_READ_PPPSA_OFF(afu); 310 show_reg("PerProcessPSA_offset", val); 311 312 val = AFUD_READ_EB(afu); 313 show_reg("Reserved", (val >> (63-7)) & 0xff); 314 show_reg("AFU_EB_len", AFUD_EB_LEN(val)); 315 316 val = AFUD_READ_EB_OFF(afu); 317 show_reg("AFU_EB_offset", val); 318 319 for (i = 0; i < afu_cr_num; i++) { 320 val = AFUD_READ_LE(afu, afu_cr_off + i * afu_cr_len); 321 show_reg("CR Vendor", val & 0xffff); 322 show_reg("CR Device", (val >> 16) & 0xffff); 323 } 324 #undef show_reg 325 } 326 327 #define CAPP_UNIT0_ID 0xBA 328 #define CAPP_UNIT1_ID 0XBE 329 330 static u64 get_capp_unit_id(struct device_node *np) 331 { 332 u32 phb_index; 333 334 /* 335 * For chips other than POWER8NVL, we only have CAPP 0, 336 * irrespective of which PHB is used. 337 */ 338 if (!pvr_version_is(PVR_POWER8NVL)) 339 return CAPP_UNIT0_ID; 340 341 /* 342 * For POWER8NVL, assume CAPP 0 is attached to PHB0 and 343 * CAPP 1 is attached to PHB1. 344 */ 345 if (of_property_read_u32(np, "ibm,phb-index", &phb_index)) 346 return 0; 347 348 if (phb_index == 0) 349 return CAPP_UNIT0_ID; 350 351 if (phb_index == 1) 352 return CAPP_UNIT1_ID; 353 354 return 0; 355 } 356 357 static int calc_capp_routing(struct pci_dev *dev, u64 *chipid, u64 *capp_unit_id) 358 { 359 struct device_node *np; 360 const __be32 *prop; 361 362 if (!(np = pnv_pci_get_phb_node(dev))) 363 return -ENODEV; 364 365 while (np && !(prop = of_get_property(np, "ibm,chip-id", NULL))) 366 np = of_get_next_parent(np); 367 if (!np) 368 return -ENODEV; 369 *chipid = be32_to_cpup(prop); 370 *capp_unit_id = get_capp_unit_id(np); 371 of_node_put(np); 372 if (!*capp_unit_id) { 373 pr_err("cxl: invalid capp unit id\n"); 374 return -ENODEV; 375 } 376 377 return 0; 378 } 379 380 static int init_implementation_adapter_psl_regs(struct cxl *adapter, struct pci_dev *dev) 381 { 382 u64 psl_dsnctl, psl_fircntl; 383 u64 chipid; 384 u64 capp_unit_id; 385 int rc; 386 387 rc = calc_capp_routing(dev, &chipid, &capp_unit_id); 388 if (rc) 389 return rc; 390 391 psl_dsnctl = 0x0000900000000000ULL; /* pteupd ttype, scdone */ 392 psl_dsnctl |= (0x2ULL << (63-38)); /* MMIO hang pulse: 256 us */ 393 /* Tell PSL where to route data to */ 394 psl_dsnctl |= (chipid << (63-5)); 395 psl_dsnctl |= (capp_unit_id << (63-13)); 396 397 cxl_p1_write(adapter, CXL_PSL_DSNDCTL, psl_dsnctl); 398 cxl_p1_write(adapter, CXL_PSL_RESLCKTO, 0x20000000200ULL); 399 /* snoop write mask */ 400 cxl_p1_write(adapter, CXL_PSL_SNWRALLOC, 0x00000000FFFFFFFFULL); 401 /* set fir_cntl to recommended value for production env */ 402 psl_fircntl = (0x2ULL << (63-3)); /* ce_report */ 403 psl_fircntl |= (0x1ULL << (63-6)); /* FIR_report */ 404 psl_fircntl |= 0x1ULL; /* ce_thresh */ 405 cxl_p1_write(adapter, CXL_PSL_FIR_CNTL, psl_fircntl); 406 /* for debugging with trace arrays */ 407 cxl_p1_write(adapter, CXL_PSL_TRACE, 0x0000FF7C00000000ULL); 408 409 return 0; 410 } 411 412 static int init_implementation_adapter_xsl_regs(struct cxl *adapter, struct pci_dev *dev) 413 { 414 u64 xsl_dsnctl; 415 u64 chipid; 416 u64 capp_unit_id; 417 int rc; 418 419 rc = calc_capp_routing(dev, &chipid, &capp_unit_id); 420 if (rc) 421 return rc; 422 423 /* Tell XSL where to route data to */ 424 xsl_dsnctl = 0x0000600000000000ULL | (chipid << (63-5)); 425 xsl_dsnctl |= (capp_unit_id << (63-13)); 426 cxl_p1_write(adapter, CXL_XSL_DSNCTL, xsl_dsnctl); 427 428 return 0; 429 } 430 431 /* PSL & XSL */ 432 #define TBSYNC_CAL(n) (((u64)n & 0x7) << (63-3)) 433 #define TBSYNC_CNT(n) (((u64)n & 0x7) << (63-6)) 434 /* For the PSL this is a multiple for 0 < n <= 7: */ 435 #define PSL_2048_250MHZ_CYCLES 1 436 437 static void write_timebase_ctrl_psl(struct cxl *adapter) 438 { 439 cxl_p1_write(adapter, CXL_PSL_TB_CTLSTAT, 440 TBSYNC_CNT(2 * PSL_2048_250MHZ_CYCLES)); 441 } 442 443 /* XSL */ 444 #define TBSYNC_ENA (1ULL << 63) 445 /* For the XSL this is 2**n * 2000 clocks for 0 < n <= 6: */ 446 #define XSL_2000_CLOCKS 1 447 #define XSL_4000_CLOCKS 2 448 #define XSL_8000_CLOCKS 3 449 450 static void write_timebase_ctrl_xsl(struct cxl *adapter) 451 { 452 cxl_p1_write(adapter, CXL_XSL_TB_CTLSTAT, 453 TBSYNC_ENA | 454 TBSYNC_CAL(3) | 455 TBSYNC_CNT(XSL_4000_CLOCKS)); 456 } 457 458 static u64 timebase_read_psl(struct cxl *adapter) 459 { 460 return cxl_p1_read(adapter, CXL_PSL_Timebase); 461 } 462 463 static u64 timebase_read_xsl(struct cxl *adapter) 464 { 465 return cxl_p1_read(adapter, CXL_XSL_Timebase); 466 } 467 468 static void cxl_setup_psl_timebase(struct cxl *adapter, struct pci_dev *dev) 469 { 470 u64 psl_tb; 471 int delta; 472 unsigned int retry = 0; 473 struct device_node *np; 474 475 adapter->psl_timebase_synced = false; 476 477 if (!(np = pnv_pci_get_phb_node(dev))) 478 return; 479 480 /* Do not fail when CAPP timebase sync is not supported by OPAL */ 481 of_node_get(np); 482 if (! of_get_property(np, "ibm,capp-timebase-sync", NULL)) { 483 of_node_put(np); 484 dev_info(&dev->dev, "PSL timebase inactive: OPAL support missing\n"); 485 return; 486 } 487 of_node_put(np); 488 489 /* 490 * Setup PSL Timebase Control and Status register 491 * with the recommended Timebase Sync Count value 492 */ 493 adapter->native->sl_ops->write_timebase_ctrl(adapter); 494 495 /* Enable PSL Timebase */ 496 cxl_p1_write(adapter, CXL_PSL_Control, 0x0000000000000000); 497 cxl_p1_write(adapter, CXL_PSL_Control, CXL_PSL_Control_tb); 498 499 /* Wait until CORE TB and PSL TB difference <= 16usecs */ 500 do { 501 msleep(1); 502 if (retry++ > 5) { 503 dev_info(&dev->dev, "PSL timebase can't synchronize\n"); 504 return; 505 } 506 psl_tb = adapter->native->sl_ops->timebase_read(adapter); 507 delta = mftb() - psl_tb; 508 if (delta < 0) 509 delta = -delta; 510 } while (tb_to_ns(delta) > 16000); 511 512 adapter->psl_timebase_synced = true; 513 return; 514 } 515 516 static int init_implementation_afu_psl_regs(struct cxl_afu *afu) 517 { 518 /* read/write masks for this slice */ 519 cxl_p1n_write(afu, CXL_PSL_APCALLOC_A, 0xFFFFFFFEFEFEFEFEULL); 520 /* APC read/write masks for this slice */ 521 cxl_p1n_write(afu, CXL_PSL_COALLOC_A, 0xFF000000FEFEFEFEULL); 522 /* for debugging with trace arrays */ 523 cxl_p1n_write(afu, CXL_PSL_SLICE_TRACE, 0x0000FFFF00000000ULL); 524 cxl_p1n_write(afu, CXL_PSL_RXCTL_A, CXL_PSL_RXCTL_AFUHP_4S); 525 526 return 0; 527 } 528 529 int cxl_pci_setup_irq(struct cxl *adapter, unsigned int hwirq, 530 unsigned int virq) 531 { 532 struct pci_dev *dev = to_pci_dev(adapter->dev.parent); 533 534 return pnv_cxl_ioda_msi_setup(dev, hwirq, virq); 535 } 536 537 int cxl_update_image_control(struct cxl *adapter) 538 { 539 struct pci_dev *dev = to_pci_dev(adapter->dev.parent); 540 int rc; 541 int vsec; 542 u8 image_state; 543 544 if (!(vsec = find_cxl_vsec(dev))) { 545 dev_err(&dev->dev, "ABORTING: CXL VSEC not found!\n"); 546 return -ENODEV; 547 } 548 549 if ((rc = CXL_READ_VSEC_IMAGE_STATE(dev, vsec, &image_state))) { 550 dev_err(&dev->dev, "failed to read image state: %i\n", rc); 551 return rc; 552 } 553 554 if (adapter->perst_loads_image) 555 image_state |= CXL_VSEC_PERST_LOADS_IMAGE; 556 else 557 image_state &= ~CXL_VSEC_PERST_LOADS_IMAGE; 558 559 if (adapter->perst_select_user) 560 image_state |= CXL_VSEC_PERST_SELECT_USER; 561 else 562 image_state &= ~CXL_VSEC_PERST_SELECT_USER; 563 564 if ((rc = CXL_WRITE_VSEC_IMAGE_STATE(dev, vsec, image_state))) { 565 dev_err(&dev->dev, "failed to update image control: %i\n", rc); 566 return rc; 567 } 568 569 return 0; 570 } 571 572 int cxl_pci_alloc_one_irq(struct cxl *adapter) 573 { 574 struct pci_dev *dev = to_pci_dev(adapter->dev.parent); 575 576 return pnv_cxl_alloc_hwirqs(dev, 1); 577 } 578 579 void cxl_pci_release_one_irq(struct cxl *adapter, int hwirq) 580 { 581 struct pci_dev *dev = to_pci_dev(adapter->dev.parent); 582 583 return pnv_cxl_release_hwirqs(dev, hwirq, 1); 584 } 585 586 int cxl_pci_alloc_irq_ranges(struct cxl_irq_ranges *irqs, 587 struct cxl *adapter, unsigned int num) 588 { 589 struct pci_dev *dev = to_pci_dev(adapter->dev.parent); 590 591 return pnv_cxl_alloc_hwirq_ranges(irqs, dev, num); 592 } 593 594 void cxl_pci_release_irq_ranges(struct cxl_irq_ranges *irqs, 595 struct cxl *adapter) 596 { 597 struct pci_dev *dev = to_pci_dev(adapter->dev.parent); 598 599 pnv_cxl_release_hwirq_ranges(irqs, dev); 600 } 601 602 static int setup_cxl_bars(struct pci_dev *dev) 603 { 604 /* Safety check in case we get backported to < 3.17 without M64 */ 605 if ((p1_base(dev) < 0x100000000ULL) || 606 (p2_base(dev) < 0x100000000ULL)) { 607 dev_err(&dev->dev, "ABORTING: M32 BAR assignment incompatible with CXL\n"); 608 return -ENODEV; 609 } 610 611 /* 612 * BAR 4/5 has a special meaning for CXL and must be programmed with a 613 * special value corresponding to the CXL protocol address range. 614 * For POWER 8 that means bits 48:49 must be set to 10 615 */ 616 pci_write_config_dword(dev, PCI_BASE_ADDRESS_4, 0x00000000); 617 pci_write_config_dword(dev, PCI_BASE_ADDRESS_5, 0x00020000); 618 619 return 0; 620 } 621 622 #ifdef CONFIG_CXL_BIMODAL 623 624 struct cxl_switch_work { 625 struct pci_dev *dev; 626 struct work_struct work; 627 int vsec; 628 int mode; 629 }; 630 631 static void switch_card_to_cxl(struct work_struct *work) 632 { 633 struct cxl_switch_work *switch_work = 634 container_of(work, struct cxl_switch_work, work); 635 struct pci_dev *dev = switch_work->dev; 636 struct pci_bus *bus = dev->bus; 637 struct pci_controller *hose = pci_bus_to_host(bus); 638 struct pci_dev *bridge; 639 struct pnv_php_slot *php_slot; 640 unsigned int devfn; 641 u8 val; 642 int rc; 643 644 dev_info(&bus->dev, "cxl: Preparing for mode switch...\n"); 645 bridge = list_first_entry_or_null(&hose->bus->devices, struct pci_dev, 646 bus_list); 647 if (!bridge) { 648 dev_WARN(&bus->dev, "cxl: Couldn't find root port!\n"); 649 goto err_dev_put; 650 } 651 652 php_slot = pnv_php_find_slot(pci_device_to_OF_node(bridge)); 653 if (!php_slot) { 654 dev_err(&bus->dev, "cxl: Failed to find slot hotplug " 655 "information. You may need to upgrade " 656 "skiboot. Aborting.\n"); 657 goto err_dev_put; 658 } 659 660 rc = CXL_READ_VSEC_MODE_CONTROL(dev, switch_work->vsec, &val); 661 if (rc) { 662 dev_err(&bus->dev, "cxl: Failed to read CAPI mode control: %i\n", rc); 663 goto err_dev_put; 664 } 665 devfn = dev->devfn; 666 667 /* Release the reference obtained in cxl_check_and_switch_mode() */ 668 pci_dev_put(dev); 669 670 dev_dbg(&bus->dev, "cxl: Removing PCI devices from kernel\n"); 671 pci_lock_rescan_remove(); 672 pci_hp_remove_devices(bridge->subordinate); 673 pci_unlock_rescan_remove(); 674 675 /* Switch the CXL protocol on the card */ 676 if (switch_work->mode == CXL_BIMODE_CXL) { 677 dev_info(&bus->dev, "cxl: Switching card to CXL mode\n"); 678 val &= ~CXL_VSEC_PROTOCOL_MASK; 679 val |= CXL_VSEC_PROTOCOL_256TB | CXL_VSEC_PROTOCOL_ENABLE; 680 rc = pnv_cxl_enable_phb_kernel_api(hose, true); 681 if (rc) { 682 dev_err(&bus->dev, "cxl: Failed to enable kernel API" 683 " on real PHB, aborting\n"); 684 goto err_free_work; 685 } 686 } else { 687 dev_WARN(&bus->dev, "cxl: Switching card to PCI mode not supported!\n"); 688 goto err_free_work; 689 } 690 691 rc = CXL_WRITE_VSEC_MODE_CONTROL_BUS(bus, devfn, switch_work->vsec, val); 692 if (rc) { 693 dev_err(&bus->dev, "cxl: Failed to configure CXL protocol: %i\n", rc); 694 goto err_free_work; 695 } 696 697 /* 698 * The CAIA spec (v1.1, Section 10.6 Bi-modal Device Support) states 699 * we must wait 100ms after this mode switch before touching PCIe config 700 * space. 701 */ 702 msleep(100); 703 704 /* 705 * Hot reset to cause the card to come back in cxl mode. A 706 * OPAL_RESET_PCI_LINK would be sufficient, but currently lacks support 707 * in skiboot, so we use a hot reset instead. 708 * 709 * We call pci_set_pcie_reset_state() on the bridge, as a CAPI card is 710 * guaranteed to sit directly under the root port, and setting the reset 711 * state on a device directly under the root port is equivalent to doing 712 * it on the root port iself. 713 */ 714 dev_info(&bus->dev, "cxl: Configuration write complete, resetting card\n"); 715 pci_set_pcie_reset_state(bridge, pcie_hot_reset); 716 pci_set_pcie_reset_state(bridge, pcie_deassert_reset); 717 718 dev_dbg(&bus->dev, "cxl: Offlining slot\n"); 719 rc = pnv_php_set_slot_power_state(&php_slot->slot, OPAL_PCI_SLOT_OFFLINE); 720 if (rc) { 721 dev_err(&bus->dev, "cxl: OPAL offlining call failed: %i\n", rc); 722 goto err_free_work; 723 } 724 725 dev_dbg(&bus->dev, "cxl: Onlining and probing slot\n"); 726 rc = pnv_php_set_slot_power_state(&php_slot->slot, OPAL_PCI_SLOT_ONLINE); 727 if (rc) { 728 dev_err(&bus->dev, "cxl: OPAL onlining call failed: %i\n", rc); 729 goto err_free_work; 730 } 731 732 pci_lock_rescan_remove(); 733 pci_hp_add_devices(bridge->subordinate); 734 pci_unlock_rescan_remove(); 735 736 dev_info(&bus->dev, "cxl: CAPI mode switch completed\n"); 737 kfree(switch_work); 738 return; 739 740 err_dev_put: 741 /* Release the reference obtained in cxl_check_and_switch_mode() */ 742 pci_dev_put(dev); 743 err_free_work: 744 kfree(switch_work); 745 } 746 747 int cxl_check_and_switch_mode(struct pci_dev *dev, int mode, int vsec) 748 { 749 struct cxl_switch_work *work; 750 u8 val; 751 int rc; 752 753 if (!cpu_has_feature(CPU_FTR_HVMODE)) 754 return -ENODEV; 755 756 if (!vsec) { 757 vsec = find_cxl_vsec(dev); 758 if (!vsec) { 759 dev_info(&dev->dev, "CXL VSEC not found\n"); 760 return -ENODEV; 761 } 762 } 763 764 rc = CXL_READ_VSEC_MODE_CONTROL(dev, vsec, &val); 765 if (rc) { 766 dev_err(&dev->dev, "Failed to read current mode control: %i", rc); 767 return rc; 768 } 769 770 if (mode == CXL_BIMODE_PCI) { 771 if (!(val & CXL_VSEC_PROTOCOL_ENABLE)) { 772 dev_info(&dev->dev, "Card is already in PCI mode\n"); 773 return 0; 774 } 775 /* 776 * TODO: Before it's safe to switch the card back to PCI mode 777 * we need to disable the CAPP and make sure any cachelines the 778 * card holds have been flushed out. Needs skiboot support. 779 */ 780 dev_WARN(&dev->dev, "CXL mode switch to PCI unsupported!\n"); 781 return -EIO; 782 } 783 784 if (val & CXL_VSEC_PROTOCOL_ENABLE) { 785 dev_info(&dev->dev, "Card is already in CXL mode\n"); 786 return 0; 787 } 788 789 dev_info(&dev->dev, "Card is in PCI mode, scheduling kernel thread " 790 "to switch to CXL mode\n"); 791 792 work = kmalloc(sizeof(struct cxl_switch_work), GFP_KERNEL); 793 if (!work) 794 return -ENOMEM; 795 796 pci_dev_get(dev); 797 work->dev = dev; 798 work->vsec = vsec; 799 work->mode = mode; 800 INIT_WORK(&work->work, switch_card_to_cxl); 801 802 schedule_work(&work->work); 803 804 /* 805 * We return a failure now to abort the driver init. Once the 806 * link has been cycled and the card is in cxl mode we will 807 * come back (possibly using the generic cxl driver), but 808 * return success as the card should then be in cxl mode. 809 * 810 * TODO: What if the card comes back in PCI mode even after 811 * the switch? Don't want to spin endlessly. 812 */ 813 return -EBUSY; 814 } 815 EXPORT_SYMBOL_GPL(cxl_check_and_switch_mode); 816 817 #endif /* CONFIG_CXL_BIMODAL */ 818 819 static int setup_cxl_protocol_area(struct pci_dev *dev) 820 { 821 u8 val; 822 int rc; 823 int vsec = find_cxl_vsec(dev); 824 825 if (!vsec) { 826 dev_info(&dev->dev, "CXL VSEC not found\n"); 827 return -ENODEV; 828 } 829 830 rc = CXL_READ_VSEC_MODE_CONTROL(dev, vsec, &val); 831 if (rc) { 832 dev_err(&dev->dev, "Failed to read current mode control: %i\n", rc); 833 return rc; 834 } 835 836 if (!(val & CXL_VSEC_PROTOCOL_ENABLE)) { 837 dev_err(&dev->dev, "Card not in CAPI mode!\n"); 838 return -EIO; 839 } 840 841 if ((val & CXL_VSEC_PROTOCOL_MASK) != CXL_VSEC_PROTOCOL_256TB) { 842 val &= ~CXL_VSEC_PROTOCOL_MASK; 843 val |= CXL_VSEC_PROTOCOL_256TB; 844 rc = CXL_WRITE_VSEC_MODE_CONTROL(dev, vsec, val); 845 if (rc) { 846 dev_err(&dev->dev, "Failed to set CXL protocol area: %i\n", rc); 847 return rc; 848 } 849 } 850 851 return 0; 852 } 853 854 static int pci_map_slice_regs(struct cxl_afu *afu, struct cxl *adapter, struct pci_dev *dev) 855 { 856 u64 p1n_base, p2n_base, afu_desc; 857 const u64 p1n_size = 0x100; 858 const u64 p2n_size = 0x1000; 859 860 p1n_base = p1_base(dev) + 0x10000 + (afu->slice * p1n_size); 861 p2n_base = p2_base(dev) + (afu->slice * p2n_size); 862 afu->psn_phys = p2_base(dev) + (adapter->native->ps_off + (afu->slice * adapter->ps_size)); 863 afu_desc = p2_base(dev) + adapter->native->afu_desc_off + (afu->slice * adapter->native->afu_desc_size); 864 865 if (!(afu->native->p1n_mmio = ioremap(p1n_base, p1n_size))) 866 goto err; 867 if (!(afu->p2n_mmio = ioremap(p2n_base, p2n_size))) 868 goto err1; 869 if (afu_desc) { 870 if (!(afu->native->afu_desc_mmio = ioremap(afu_desc, adapter->native->afu_desc_size))) 871 goto err2; 872 } 873 874 return 0; 875 err2: 876 iounmap(afu->p2n_mmio); 877 err1: 878 iounmap(afu->native->p1n_mmio); 879 err: 880 dev_err(&afu->dev, "Error mapping AFU MMIO regions\n"); 881 return -ENOMEM; 882 } 883 884 static void pci_unmap_slice_regs(struct cxl_afu *afu) 885 { 886 if (afu->p2n_mmio) { 887 iounmap(afu->p2n_mmio); 888 afu->p2n_mmio = NULL; 889 } 890 if (afu->native->p1n_mmio) { 891 iounmap(afu->native->p1n_mmio); 892 afu->native->p1n_mmio = NULL; 893 } 894 if (afu->native->afu_desc_mmio) { 895 iounmap(afu->native->afu_desc_mmio); 896 afu->native->afu_desc_mmio = NULL; 897 } 898 } 899 900 void cxl_pci_release_afu(struct device *dev) 901 { 902 struct cxl_afu *afu = to_cxl_afu(dev); 903 904 pr_devel("%s\n", __func__); 905 906 idr_destroy(&afu->contexts_idr); 907 cxl_release_spa(afu); 908 909 kfree(afu->native); 910 kfree(afu); 911 } 912 913 /* Expects AFU struct to have recently been zeroed out */ 914 static int cxl_read_afu_descriptor(struct cxl_afu *afu) 915 { 916 u64 val; 917 918 val = AFUD_READ_INFO(afu); 919 afu->pp_irqs = AFUD_NUM_INTS_PER_PROC(val); 920 afu->max_procs_virtualised = AFUD_NUM_PROCS(val); 921 afu->crs_num = AFUD_NUM_CRS(val); 922 923 if (AFUD_AFU_DIRECTED(val)) 924 afu->modes_supported |= CXL_MODE_DIRECTED; 925 if (AFUD_DEDICATED_PROCESS(val)) 926 afu->modes_supported |= CXL_MODE_DEDICATED; 927 if (AFUD_TIME_SLICED(val)) 928 afu->modes_supported |= CXL_MODE_TIME_SLICED; 929 930 val = AFUD_READ_PPPSA(afu); 931 afu->pp_size = AFUD_PPPSA_LEN(val) * 4096; 932 afu->psa = AFUD_PPPSA_PSA(val); 933 if ((afu->pp_psa = AFUD_PPPSA_PP(val))) 934 afu->native->pp_offset = AFUD_READ_PPPSA_OFF(afu); 935 936 val = AFUD_READ_CR(afu); 937 afu->crs_len = AFUD_CR_LEN(val) * 256; 938 afu->crs_offset = AFUD_READ_CR_OFF(afu); 939 940 941 /* eb_len is in multiple of 4K */ 942 afu->eb_len = AFUD_EB_LEN(AFUD_READ_EB(afu)) * 4096; 943 afu->eb_offset = AFUD_READ_EB_OFF(afu); 944 945 /* eb_off is 4K aligned so lower 12 bits are always zero */ 946 if (EXTRACT_PPC_BITS(afu->eb_offset, 0, 11) != 0) { 947 dev_warn(&afu->dev, 948 "Invalid AFU error buffer offset %Lx\n", 949 afu->eb_offset); 950 dev_info(&afu->dev, 951 "Ignoring AFU error buffer in the descriptor\n"); 952 /* indicate that no afu buffer exists */ 953 afu->eb_len = 0; 954 } 955 956 return 0; 957 } 958 959 static int cxl_afu_descriptor_looks_ok(struct cxl_afu *afu) 960 { 961 int i, rc; 962 u32 val; 963 964 if (afu->psa && afu->adapter->ps_size < 965 (afu->native->pp_offset + afu->pp_size*afu->max_procs_virtualised)) { 966 dev_err(&afu->dev, "per-process PSA can't fit inside the PSA!\n"); 967 return -ENODEV; 968 } 969 970 if (afu->pp_psa && (afu->pp_size < PAGE_SIZE)) 971 dev_warn(&afu->dev, "AFU uses < PAGE_SIZE per-process PSA!"); 972 973 for (i = 0; i < afu->crs_num; i++) { 974 rc = cxl_ops->afu_cr_read32(afu, i, 0, &val); 975 if (rc || val == 0) { 976 dev_err(&afu->dev, "ABORTING: AFU configuration record %i is invalid\n", i); 977 return -EINVAL; 978 } 979 } 980 981 if ((afu->modes_supported & ~CXL_MODE_DEDICATED) && afu->max_procs_virtualised == 0) { 982 /* 983 * We could also check this for the dedicated process model 984 * since the architecture indicates it should be set to 1, but 985 * in that case we ignore the value and I'd rather not risk 986 * breaking any existing dedicated process AFUs that left it as 987 * 0 (not that I'm aware of any). It is clearly an error for an 988 * AFU directed AFU to set this to 0, and would have previously 989 * triggered a bug resulting in the maximum not being enforced 990 * at all since idr_alloc treats 0 as no maximum. 991 */ 992 dev_err(&afu->dev, "AFU does not support any processes\n"); 993 return -EINVAL; 994 } 995 996 return 0; 997 } 998 999 static int sanitise_afu_regs(struct cxl_afu *afu) 1000 { 1001 u64 reg; 1002 1003 /* 1004 * Clear out any regs that contain either an IVTE or address or may be 1005 * waiting on an acknowledgement to try to be a bit safer as we bring 1006 * it online 1007 */ 1008 reg = cxl_p2n_read(afu, CXL_AFU_Cntl_An); 1009 if ((reg & CXL_AFU_Cntl_An_ES_MASK) != CXL_AFU_Cntl_An_ES_Disabled) { 1010 dev_warn(&afu->dev, "WARNING: AFU was not disabled: %#016llx\n", reg); 1011 if (cxl_ops->afu_reset(afu)) 1012 return -EIO; 1013 if (cxl_afu_disable(afu)) 1014 return -EIO; 1015 if (cxl_psl_purge(afu)) 1016 return -EIO; 1017 } 1018 cxl_p1n_write(afu, CXL_PSL_SPAP_An, 0x0000000000000000); 1019 cxl_p1n_write(afu, CXL_PSL_IVTE_Limit_An, 0x0000000000000000); 1020 cxl_p1n_write(afu, CXL_PSL_IVTE_Offset_An, 0x0000000000000000); 1021 cxl_p1n_write(afu, CXL_PSL_AMBAR_An, 0x0000000000000000); 1022 cxl_p1n_write(afu, CXL_PSL_SPOffset_An, 0x0000000000000000); 1023 cxl_p1n_write(afu, CXL_HAURP_An, 0x0000000000000000); 1024 cxl_p2n_write(afu, CXL_CSRP_An, 0x0000000000000000); 1025 cxl_p2n_write(afu, CXL_AURP1_An, 0x0000000000000000); 1026 cxl_p2n_write(afu, CXL_AURP0_An, 0x0000000000000000); 1027 cxl_p2n_write(afu, CXL_SSTP1_An, 0x0000000000000000); 1028 cxl_p2n_write(afu, CXL_SSTP0_An, 0x0000000000000000); 1029 reg = cxl_p2n_read(afu, CXL_PSL_DSISR_An); 1030 if (reg) { 1031 dev_warn(&afu->dev, "AFU had pending DSISR: %#016llx\n", reg); 1032 if (reg & CXL_PSL_DSISR_TRANS) 1033 cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_AE); 1034 else 1035 cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_A); 1036 } 1037 if (afu->adapter->native->sl_ops->register_serr_irq) { 1038 reg = cxl_p1n_read(afu, CXL_PSL_SERR_An); 1039 if (reg) { 1040 if (reg & ~0xffff) 1041 dev_warn(&afu->dev, "AFU had pending SERR: %#016llx\n", reg); 1042 cxl_p1n_write(afu, CXL_PSL_SERR_An, reg & ~0xffff); 1043 } 1044 } 1045 reg = cxl_p2n_read(afu, CXL_PSL_ErrStat_An); 1046 if (reg) { 1047 dev_warn(&afu->dev, "AFU had pending error status: %#016llx\n", reg); 1048 cxl_p2n_write(afu, CXL_PSL_ErrStat_An, reg); 1049 } 1050 1051 return 0; 1052 } 1053 1054 #define ERR_BUFF_MAX_COPY_SIZE PAGE_SIZE 1055 /* 1056 * afu_eb_read: 1057 * Called from sysfs and reads the afu error info buffer. The h/w only supports 1058 * 4/8 bytes aligned access. So in case the requested offset/count arent 8 byte 1059 * aligned the function uses a bounce buffer which can be max PAGE_SIZE. 1060 */ 1061 ssize_t cxl_pci_afu_read_err_buffer(struct cxl_afu *afu, char *buf, 1062 loff_t off, size_t count) 1063 { 1064 loff_t aligned_start, aligned_end; 1065 size_t aligned_length; 1066 void *tbuf; 1067 const void __iomem *ebuf = afu->native->afu_desc_mmio + afu->eb_offset; 1068 1069 if (count == 0 || off < 0 || (size_t)off >= afu->eb_len) 1070 return 0; 1071 1072 /* calculate aligned read window */ 1073 count = min((size_t)(afu->eb_len - off), count); 1074 aligned_start = round_down(off, 8); 1075 aligned_end = round_up(off + count, 8); 1076 aligned_length = aligned_end - aligned_start; 1077 1078 /* max we can copy in one read is PAGE_SIZE */ 1079 if (aligned_length > ERR_BUFF_MAX_COPY_SIZE) { 1080 aligned_length = ERR_BUFF_MAX_COPY_SIZE; 1081 count = ERR_BUFF_MAX_COPY_SIZE - (off & 0x7); 1082 } 1083 1084 /* use bounce buffer for copy */ 1085 tbuf = (void *)__get_free_page(GFP_TEMPORARY); 1086 if (!tbuf) 1087 return -ENOMEM; 1088 1089 /* perform aligned read from the mmio region */ 1090 memcpy_fromio(tbuf, ebuf + aligned_start, aligned_length); 1091 memcpy(buf, tbuf + (off & 0x7), count); 1092 1093 free_page((unsigned long)tbuf); 1094 1095 return count; 1096 } 1097 1098 static int pci_configure_afu(struct cxl_afu *afu, struct cxl *adapter, struct pci_dev *dev) 1099 { 1100 int rc; 1101 1102 if ((rc = pci_map_slice_regs(afu, adapter, dev))) 1103 return rc; 1104 1105 if ((rc = sanitise_afu_regs(afu))) 1106 goto err1; 1107 1108 /* We need to reset the AFU before we can read the AFU descriptor */ 1109 if ((rc = cxl_ops->afu_reset(afu))) 1110 goto err1; 1111 1112 if (cxl_verbose) 1113 dump_afu_descriptor(afu); 1114 1115 if ((rc = cxl_read_afu_descriptor(afu))) 1116 goto err1; 1117 1118 if ((rc = cxl_afu_descriptor_looks_ok(afu))) 1119 goto err1; 1120 1121 if (adapter->native->sl_ops->afu_regs_init) 1122 if ((rc = adapter->native->sl_ops->afu_regs_init(afu))) 1123 goto err1; 1124 1125 if (adapter->native->sl_ops->register_serr_irq) 1126 if ((rc = adapter->native->sl_ops->register_serr_irq(afu))) 1127 goto err1; 1128 1129 if ((rc = cxl_native_register_psl_irq(afu))) 1130 goto err2; 1131 1132 return 0; 1133 1134 err2: 1135 if (adapter->native->sl_ops->release_serr_irq) 1136 adapter->native->sl_ops->release_serr_irq(afu); 1137 err1: 1138 pci_unmap_slice_regs(afu); 1139 return rc; 1140 } 1141 1142 static void pci_deconfigure_afu(struct cxl_afu *afu) 1143 { 1144 cxl_native_release_psl_irq(afu); 1145 if (afu->adapter->native->sl_ops->release_serr_irq) 1146 afu->adapter->native->sl_ops->release_serr_irq(afu); 1147 pci_unmap_slice_regs(afu); 1148 } 1149 1150 static int pci_init_afu(struct cxl *adapter, int slice, struct pci_dev *dev) 1151 { 1152 struct cxl_afu *afu; 1153 int rc = -ENOMEM; 1154 1155 afu = cxl_alloc_afu(adapter, slice); 1156 if (!afu) 1157 return -ENOMEM; 1158 1159 afu->native = kzalloc(sizeof(struct cxl_afu_native), GFP_KERNEL); 1160 if (!afu->native) 1161 goto err_free_afu; 1162 1163 mutex_init(&afu->native->spa_mutex); 1164 1165 rc = dev_set_name(&afu->dev, "afu%i.%i", adapter->adapter_num, slice); 1166 if (rc) 1167 goto err_free_native; 1168 1169 rc = pci_configure_afu(afu, adapter, dev); 1170 if (rc) 1171 goto err_free_native; 1172 1173 /* Don't care if this fails */ 1174 cxl_debugfs_afu_add(afu); 1175 1176 /* 1177 * After we call this function we must not free the afu directly, even 1178 * if it returns an error! 1179 */ 1180 if ((rc = cxl_register_afu(afu))) 1181 goto err_put1; 1182 1183 if ((rc = cxl_sysfs_afu_add(afu))) 1184 goto err_put1; 1185 1186 adapter->afu[afu->slice] = afu; 1187 1188 if ((rc = cxl_pci_vphb_add(afu))) 1189 dev_info(&afu->dev, "Can't register vPHB\n"); 1190 1191 return 0; 1192 1193 err_put1: 1194 pci_deconfigure_afu(afu); 1195 cxl_debugfs_afu_remove(afu); 1196 device_unregister(&afu->dev); 1197 return rc; 1198 1199 err_free_native: 1200 kfree(afu->native); 1201 err_free_afu: 1202 kfree(afu); 1203 return rc; 1204 1205 } 1206 1207 static void cxl_pci_remove_afu(struct cxl_afu *afu) 1208 { 1209 pr_devel("%s\n", __func__); 1210 1211 if (!afu) 1212 return; 1213 1214 cxl_pci_vphb_remove(afu); 1215 cxl_sysfs_afu_remove(afu); 1216 cxl_debugfs_afu_remove(afu); 1217 1218 spin_lock(&afu->adapter->afu_list_lock); 1219 afu->adapter->afu[afu->slice] = NULL; 1220 spin_unlock(&afu->adapter->afu_list_lock); 1221 1222 cxl_context_detach_all(afu); 1223 cxl_ops->afu_deactivate_mode(afu, afu->current_mode); 1224 1225 pci_deconfigure_afu(afu); 1226 device_unregister(&afu->dev); 1227 } 1228 1229 int cxl_pci_reset(struct cxl *adapter) 1230 { 1231 struct pci_dev *dev = to_pci_dev(adapter->dev.parent); 1232 int rc; 1233 1234 if (adapter->perst_same_image) { 1235 dev_warn(&dev->dev, 1236 "cxl: refusing to reset/reflash when perst_reloads_same_image is set.\n"); 1237 return -EINVAL; 1238 } 1239 1240 dev_info(&dev->dev, "CXL reset\n"); 1241 1242 /* pcie_warm_reset requests a fundamental pci reset which includes a 1243 * PERST assert/deassert. PERST triggers a loading of the image 1244 * if "user" or "factory" is selected in sysfs */ 1245 if ((rc = pci_set_pcie_reset_state(dev, pcie_warm_reset))) { 1246 dev_err(&dev->dev, "cxl: pcie_warm_reset failed\n"); 1247 return rc; 1248 } 1249 1250 return rc; 1251 } 1252 1253 static int cxl_map_adapter_regs(struct cxl *adapter, struct pci_dev *dev) 1254 { 1255 if (pci_request_region(dev, 2, "priv 2 regs")) 1256 goto err1; 1257 if (pci_request_region(dev, 0, "priv 1 regs")) 1258 goto err2; 1259 1260 pr_devel("cxl_map_adapter_regs: p1: %#016llx %#llx, p2: %#016llx %#llx", 1261 p1_base(dev), p1_size(dev), p2_base(dev), p2_size(dev)); 1262 1263 if (!(adapter->native->p1_mmio = ioremap(p1_base(dev), p1_size(dev)))) 1264 goto err3; 1265 1266 if (!(adapter->native->p2_mmio = ioremap(p2_base(dev), p2_size(dev)))) 1267 goto err4; 1268 1269 return 0; 1270 1271 err4: 1272 iounmap(adapter->native->p1_mmio); 1273 adapter->native->p1_mmio = NULL; 1274 err3: 1275 pci_release_region(dev, 0); 1276 err2: 1277 pci_release_region(dev, 2); 1278 err1: 1279 return -ENOMEM; 1280 } 1281 1282 static void cxl_unmap_adapter_regs(struct cxl *adapter) 1283 { 1284 if (adapter->native->p1_mmio) { 1285 iounmap(adapter->native->p1_mmio); 1286 adapter->native->p1_mmio = NULL; 1287 pci_release_region(to_pci_dev(adapter->dev.parent), 2); 1288 } 1289 if (adapter->native->p2_mmio) { 1290 iounmap(adapter->native->p2_mmio); 1291 adapter->native->p2_mmio = NULL; 1292 pci_release_region(to_pci_dev(adapter->dev.parent), 0); 1293 } 1294 } 1295 1296 static int cxl_read_vsec(struct cxl *adapter, struct pci_dev *dev) 1297 { 1298 int vsec; 1299 u32 afu_desc_off, afu_desc_size; 1300 u32 ps_off, ps_size; 1301 u16 vseclen; 1302 u8 image_state; 1303 1304 if (!(vsec = find_cxl_vsec(dev))) { 1305 dev_err(&dev->dev, "ABORTING: CXL VSEC not found!\n"); 1306 return -ENODEV; 1307 } 1308 1309 CXL_READ_VSEC_LENGTH(dev, vsec, &vseclen); 1310 if (vseclen < CXL_VSEC_MIN_SIZE) { 1311 dev_err(&dev->dev, "ABORTING: CXL VSEC too short\n"); 1312 return -EINVAL; 1313 } 1314 1315 CXL_READ_VSEC_STATUS(dev, vsec, &adapter->vsec_status); 1316 CXL_READ_VSEC_PSL_REVISION(dev, vsec, &adapter->psl_rev); 1317 CXL_READ_VSEC_CAIA_MAJOR(dev, vsec, &adapter->caia_major); 1318 CXL_READ_VSEC_CAIA_MINOR(dev, vsec, &adapter->caia_minor); 1319 CXL_READ_VSEC_BASE_IMAGE(dev, vsec, &adapter->base_image); 1320 CXL_READ_VSEC_IMAGE_STATE(dev, vsec, &image_state); 1321 adapter->user_image_loaded = !!(image_state & CXL_VSEC_USER_IMAGE_LOADED); 1322 adapter->perst_select_user = !!(image_state & CXL_VSEC_USER_IMAGE_LOADED); 1323 1324 CXL_READ_VSEC_NAFUS(dev, vsec, &adapter->slices); 1325 CXL_READ_VSEC_AFU_DESC_OFF(dev, vsec, &afu_desc_off); 1326 CXL_READ_VSEC_AFU_DESC_SIZE(dev, vsec, &afu_desc_size); 1327 CXL_READ_VSEC_PS_OFF(dev, vsec, &ps_off); 1328 CXL_READ_VSEC_PS_SIZE(dev, vsec, &ps_size); 1329 1330 /* Convert everything to bytes, because there is NO WAY I'd look at the 1331 * code a month later and forget what units these are in ;-) */ 1332 adapter->native->ps_off = ps_off * 64 * 1024; 1333 adapter->ps_size = ps_size * 64 * 1024; 1334 adapter->native->afu_desc_off = afu_desc_off * 64 * 1024; 1335 adapter->native->afu_desc_size = afu_desc_size * 64 * 1024; 1336 1337 /* Total IRQs - 1 PSL ERROR - #AFU*(1 slice error + 1 DSI) */ 1338 adapter->user_irqs = pnv_cxl_get_irq_count(dev) - 1 - 2*adapter->slices; 1339 1340 return 0; 1341 } 1342 1343 /* 1344 * Workaround a PCIe Host Bridge defect on some cards, that can cause 1345 * malformed Transaction Layer Packet (TLP) errors to be erroneously 1346 * reported. Mask this error in the Uncorrectable Error Mask Register. 1347 * 1348 * The upper nibble of the PSL revision is used to distinguish between 1349 * different cards. The affected ones have it set to 0. 1350 */ 1351 static void cxl_fixup_malformed_tlp(struct cxl *adapter, struct pci_dev *dev) 1352 { 1353 int aer; 1354 u32 data; 1355 1356 if (adapter->psl_rev & 0xf000) 1357 return; 1358 if (!(aer = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR))) 1359 return; 1360 pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_MASK, &data); 1361 if (data & PCI_ERR_UNC_MALF_TLP) 1362 if (data & PCI_ERR_UNC_INTN) 1363 return; 1364 data |= PCI_ERR_UNC_MALF_TLP; 1365 data |= PCI_ERR_UNC_INTN; 1366 pci_write_config_dword(dev, aer + PCI_ERR_UNCOR_MASK, data); 1367 } 1368 1369 static int cxl_vsec_looks_ok(struct cxl *adapter, struct pci_dev *dev) 1370 { 1371 if (adapter->vsec_status & CXL_STATUS_SECOND_PORT) 1372 return -EBUSY; 1373 1374 if (adapter->vsec_status & CXL_UNSUPPORTED_FEATURES) { 1375 dev_err(&dev->dev, "ABORTING: CXL requires unsupported features\n"); 1376 return -EINVAL; 1377 } 1378 1379 if (!adapter->slices) { 1380 /* Once we support dynamic reprogramming we can use the card if 1381 * it supports loadable AFUs */ 1382 dev_err(&dev->dev, "ABORTING: Device has no AFUs\n"); 1383 return -EINVAL; 1384 } 1385 1386 if (!adapter->native->afu_desc_off || !adapter->native->afu_desc_size) { 1387 dev_err(&dev->dev, "ABORTING: VSEC shows no AFU descriptors\n"); 1388 return -EINVAL; 1389 } 1390 1391 if (adapter->ps_size > p2_size(dev) - adapter->native->ps_off) { 1392 dev_err(&dev->dev, "ABORTING: Problem state size larger than " 1393 "available in BAR2: 0x%llx > 0x%llx\n", 1394 adapter->ps_size, p2_size(dev) - adapter->native->ps_off); 1395 return -EINVAL; 1396 } 1397 1398 return 0; 1399 } 1400 1401 ssize_t cxl_pci_read_adapter_vpd(struct cxl *adapter, void *buf, size_t len) 1402 { 1403 return pci_read_vpd(to_pci_dev(adapter->dev.parent), 0, len, buf); 1404 } 1405 1406 static void cxl_release_adapter(struct device *dev) 1407 { 1408 struct cxl *adapter = to_cxl_adapter(dev); 1409 1410 pr_devel("cxl_release_adapter\n"); 1411 1412 cxl_remove_adapter_nr(adapter); 1413 1414 kfree(adapter->native); 1415 kfree(adapter); 1416 } 1417 1418 #define CXL_PSL_ErrIVTE_tberror (0x1ull << (63-31)) 1419 1420 static int sanitise_adapter_regs(struct cxl *adapter) 1421 { 1422 /* Clear PSL tberror bit by writing 1 to it */ 1423 cxl_p1_write(adapter, CXL_PSL_ErrIVTE, CXL_PSL_ErrIVTE_tberror); 1424 return cxl_tlb_slb_invalidate(adapter); 1425 } 1426 1427 /* This should contain *only* operations that can safely be done in 1428 * both creation and recovery. 1429 */ 1430 static int cxl_configure_adapter(struct cxl *adapter, struct pci_dev *dev) 1431 { 1432 int rc; 1433 1434 adapter->dev.parent = &dev->dev; 1435 adapter->dev.release = cxl_release_adapter; 1436 pci_set_drvdata(dev, adapter); 1437 1438 rc = pci_enable_device(dev); 1439 if (rc) { 1440 dev_err(&dev->dev, "pci_enable_device failed: %i\n", rc); 1441 return rc; 1442 } 1443 1444 if ((rc = cxl_read_vsec(adapter, dev))) 1445 return rc; 1446 1447 if ((rc = cxl_vsec_looks_ok(adapter, dev))) 1448 return rc; 1449 1450 cxl_fixup_malformed_tlp(adapter, dev); 1451 1452 if ((rc = setup_cxl_bars(dev))) 1453 return rc; 1454 1455 if ((rc = setup_cxl_protocol_area(dev))) 1456 return rc; 1457 1458 if ((rc = cxl_update_image_control(adapter))) 1459 return rc; 1460 1461 if ((rc = cxl_map_adapter_regs(adapter, dev))) 1462 return rc; 1463 1464 if ((rc = sanitise_adapter_regs(adapter))) 1465 goto err; 1466 1467 if ((rc = adapter->native->sl_ops->adapter_regs_init(adapter, dev))) 1468 goto err; 1469 1470 /* Required for devices using CAPP DMA mode, harmless for others */ 1471 pci_set_master(dev); 1472 1473 if ((rc = pnv_phb_to_cxl_mode(dev, adapter->native->sl_ops->capi_mode))) 1474 goto err; 1475 1476 /* If recovery happened, the last step is to turn on snooping. 1477 * In the non-recovery case this has no effect */ 1478 if ((rc = pnv_phb_to_cxl_mode(dev, OPAL_PHB_CAPI_MODE_SNOOP_ON))) 1479 goto err; 1480 1481 /* Ignore error, adapter init is not dependant on timebase sync */ 1482 cxl_setup_psl_timebase(adapter, dev); 1483 1484 if ((rc = cxl_native_register_psl_err_irq(adapter))) 1485 goto err; 1486 1487 return 0; 1488 1489 err: 1490 cxl_unmap_adapter_regs(adapter); 1491 return rc; 1492 1493 } 1494 1495 static void cxl_deconfigure_adapter(struct cxl *adapter) 1496 { 1497 struct pci_dev *pdev = to_pci_dev(adapter->dev.parent); 1498 1499 cxl_native_release_psl_err_irq(adapter); 1500 cxl_unmap_adapter_regs(adapter); 1501 1502 pci_disable_device(pdev); 1503 } 1504 1505 static const struct cxl_service_layer_ops psl_ops = { 1506 .adapter_regs_init = init_implementation_adapter_psl_regs, 1507 .afu_regs_init = init_implementation_afu_psl_regs, 1508 .register_serr_irq = cxl_native_register_serr_irq, 1509 .release_serr_irq = cxl_native_release_serr_irq, 1510 .debugfs_add_adapter_sl_regs = cxl_debugfs_add_adapter_psl_regs, 1511 .debugfs_add_afu_sl_regs = cxl_debugfs_add_afu_psl_regs, 1512 .psl_irq_dump_registers = cxl_native_psl_irq_dump_regs, 1513 .err_irq_dump_registers = cxl_native_err_irq_dump_regs, 1514 .debugfs_stop_trace = cxl_stop_trace, 1515 .write_timebase_ctrl = write_timebase_ctrl_psl, 1516 .timebase_read = timebase_read_psl, 1517 .capi_mode = OPAL_PHB_CAPI_MODE_CAPI, 1518 .needs_reset_before_disable = true, 1519 }; 1520 1521 static const struct cxl_service_layer_ops xsl_ops = { 1522 .adapter_regs_init = init_implementation_adapter_xsl_regs, 1523 .debugfs_add_adapter_sl_regs = cxl_debugfs_add_adapter_xsl_regs, 1524 .write_timebase_ctrl = write_timebase_ctrl_xsl, 1525 .timebase_read = timebase_read_xsl, 1526 .capi_mode = OPAL_PHB_CAPI_MODE_DMA, 1527 }; 1528 1529 static void set_sl_ops(struct cxl *adapter, struct pci_dev *dev) 1530 { 1531 if (dev->vendor == PCI_VENDOR_ID_MELLANOX && dev->device == 0x1013) { 1532 /* Mellanox CX-4 */ 1533 dev_info(&adapter->dev, "Device uses an XSL\n"); 1534 adapter->native->sl_ops = &xsl_ops; 1535 adapter->min_pe = 1; /* Workaround for CX-4 hardware bug */ 1536 } else { 1537 dev_info(&adapter->dev, "Device uses a PSL\n"); 1538 adapter->native->sl_ops = &psl_ops; 1539 } 1540 } 1541 1542 1543 static struct cxl *cxl_pci_init_adapter(struct pci_dev *dev) 1544 { 1545 struct cxl *adapter; 1546 int rc; 1547 1548 adapter = cxl_alloc_adapter(); 1549 if (!adapter) 1550 return ERR_PTR(-ENOMEM); 1551 1552 adapter->native = kzalloc(sizeof(struct cxl_native), GFP_KERNEL); 1553 if (!adapter->native) { 1554 rc = -ENOMEM; 1555 goto err_release; 1556 } 1557 1558 set_sl_ops(adapter, dev); 1559 1560 /* Set defaults for parameters which need to persist over 1561 * configure/reconfigure 1562 */ 1563 adapter->perst_loads_image = true; 1564 adapter->perst_same_image = false; 1565 1566 rc = cxl_configure_adapter(adapter, dev); 1567 if (rc) { 1568 pci_disable_device(dev); 1569 goto err_release; 1570 } 1571 1572 /* Don't care if this one fails: */ 1573 cxl_debugfs_adapter_add(adapter); 1574 1575 /* 1576 * After we call this function we must not free the adapter directly, 1577 * even if it returns an error! 1578 */ 1579 if ((rc = cxl_register_adapter(adapter))) 1580 goto err_put1; 1581 1582 if ((rc = cxl_sysfs_adapter_add(adapter))) 1583 goto err_put1; 1584 1585 return adapter; 1586 1587 err_put1: 1588 /* This should mirror cxl_remove_adapter, except without the 1589 * sysfs parts 1590 */ 1591 cxl_debugfs_adapter_remove(adapter); 1592 cxl_deconfigure_adapter(adapter); 1593 device_unregister(&adapter->dev); 1594 return ERR_PTR(rc); 1595 1596 err_release: 1597 cxl_release_adapter(&adapter->dev); 1598 return ERR_PTR(rc); 1599 } 1600 1601 static void cxl_pci_remove_adapter(struct cxl *adapter) 1602 { 1603 pr_devel("cxl_remove_adapter\n"); 1604 1605 cxl_sysfs_adapter_remove(adapter); 1606 cxl_debugfs_adapter_remove(adapter); 1607 1608 cxl_deconfigure_adapter(adapter); 1609 1610 device_unregister(&adapter->dev); 1611 } 1612 1613 #define CXL_MAX_PCIEX_PARENT 2 1614 1615 static int cxl_slot_is_switched(struct pci_dev *dev) 1616 { 1617 struct device_node *np; 1618 int depth = 0; 1619 const __be32 *prop; 1620 1621 if (!(np = pci_device_to_OF_node(dev))) { 1622 pr_err("cxl: np = NULL\n"); 1623 return -ENODEV; 1624 } 1625 of_node_get(np); 1626 while (np) { 1627 np = of_get_next_parent(np); 1628 prop = of_get_property(np, "device_type", NULL); 1629 if (!prop || strcmp((char *)prop, "pciex")) 1630 break; 1631 depth++; 1632 } 1633 of_node_put(np); 1634 return (depth > CXL_MAX_PCIEX_PARENT); 1635 } 1636 1637 bool cxl_slot_is_supported(struct pci_dev *dev, int flags) 1638 { 1639 if (!cpu_has_feature(CPU_FTR_HVMODE)) 1640 return false; 1641 1642 if ((flags & CXL_SLOT_FLAG_DMA) && (!pvr_version_is(PVR_POWER8NVL))) { 1643 /* 1644 * CAPP DMA mode is technically supported on regular P8, but 1645 * will EEH if the card attempts to access memory < 4GB, which 1646 * we cannot realistically avoid. We might be able to work 1647 * around the issue, but until then return unsupported: 1648 */ 1649 return false; 1650 } 1651 1652 if (cxl_slot_is_switched(dev)) 1653 return false; 1654 1655 /* 1656 * XXX: This gets a little tricky on regular P8 (not POWER8NVL) since 1657 * the CAPP can be connected to PHB 0, 1 or 2 on a first come first 1658 * served basis, which is racy to check from here. If we need to 1659 * support this in future we might need to consider having this 1660 * function effectively reserve it ahead of time. 1661 * 1662 * Currently, the only user of this API is the Mellanox CX4, which is 1663 * only supported on P8NVL due to the above mentioned limitation of 1664 * CAPP DMA mode and therefore does not need to worry about this. If the 1665 * issue with CAPP DMA mode is later worked around on P8 we might need 1666 * to revisit this. 1667 */ 1668 1669 return true; 1670 } 1671 EXPORT_SYMBOL_GPL(cxl_slot_is_supported); 1672 1673 1674 static int cxl_probe(struct pci_dev *dev, const struct pci_device_id *id) 1675 { 1676 struct cxl *adapter; 1677 int slice; 1678 int rc; 1679 1680 if (cxl_pci_is_vphb_device(dev)) { 1681 dev_dbg(&dev->dev, "cxl_init_adapter: Ignoring cxl vphb device\n"); 1682 return -ENODEV; 1683 } 1684 1685 if (cxl_slot_is_switched(dev)) { 1686 dev_info(&dev->dev, "Ignoring card on incompatible PCI slot\n"); 1687 return -ENODEV; 1688 } 1689 1690 if (cxl_verbose) 1691 dump_cxl_config_space(dev); 1692 1693 adapter = cxl_pci_init_adapter(dev); 1694 if (IS_ERR(adapter)) { 1695 dev_err(&dev->dev, "cxl_init_adapter failed: %li\n", PTR_ERR(adapter)); 1696 return PTR_ERR(adapter); 1697 } 1698 1699 for (slice = 0; slice < adapter->slices; slice++) { 1700 if ((rc = pci_init_afu(adapter, slice, dev))) { 1701 dev_err(&dev->dev, "AFU %i failed to initialise: %i\n", slice, rc); 1702 continue; 1703 } 1704 1705 rc = cxl_afu_select_best_mode(adapter->afu[slice]); 1706 if (rc) 1707 dev_err(&dev->dev, "AFU %i failed to start: %i\n", slice, rc); 1708 } 1709 1710 if (pnv_pci_on_cxl_phb(dev) && adapter->slices >= 1) 1711 pnv_cxl_phb_set_peer_afu(dev, adapter->afu[0]); 1712 1713 return 0; 1714 } 1715 1716 static void cxl_remove(struct pci_dev *dev) 1717 { 1718 struct cxl *adapter = pci_get_drvdata(dev); 1719 struct cxl_afu *afu; 1720 int i; 1721 1722 /* 1723 * Lock to prevent someone grabbing a ref through the adapter list as 1724 * we are removing it 1725 */ 1726 for (i = 0; i < adapter->slices; i++) { 1727 afu = adapter->afu[i]; 1728 cxl_pci_remove_afu(afu); 1729 } 1730 cxl_pci_remove_adapter(adapter); 1731 } 1732 1733 static pci_ers_result_t cxl_vphb_error_detected(struct cxl_afu *afu, 1734 pci_channel_state_t state) 1735 { 1736 struct pci_dev *afu_dev; 1737 pci_ers_result_t result = PCI_ERS_RESULT_NEED_RESET; 1738 pci_ers_result_t afu_result = PCI_ERS_RESULT_NEED_RESET; 1739 1740 /* There should only be one entry, but go through the list 1741 * anyway 1742 */ 1743 list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) { 1744 if (!afu_dev->driver) 1745 continue; 1746 1747 afu_dev->error_state = state; 1748 1749 if (afu_dev->driver->err_handler) 1750 afu_result = afu_dev->driver->err_handler->error_detected(afu_dev, 1751 state); 1752 /* Disconnect trumps all, NONE trumps NEED_RESET */ 1753 if (afu_result == PCI_ERS_RESULT_DISCONNECT) 1754 result = PCI_ERS_RESULT_DISCONNECT; 1755 else if ((afu_result == PCI_ERS_RESULT_NONE) && 1756 (result == PCI_ERS_RESULT_NEED_RESET)) 1757 result = PCI_ERS_RESULT_NONE; 1758 } 1759 return result; 1760 } 1761 1762 static pci_ers_result_t cxl_pci_error_detected(struct pci_dev *pdev, 1763 pci_channel_state_t state) 1764 { 1765 struct cxl *adapter = pci_get_drvdata(pdev); 1766 struct cxl_afu *afu; 1767 pci_ers_result_t result = PCI_ERS_RESULT_NEED_RESET; 1768 int i; 1769 1770 /* At this point, we could still have an interrupt pending. 1771 * Let's try to get them out of the way before they do 1772 * anything we don't like. 1773 */ 1774 schedule(); 1775 1776 /* If we're permanently dead, give up. */ 1777 if (state == pci_channel_io_perm_failure) { 1778 /* Tell the AFU drivers; but we don't care what they 1779 * say, we're going away. 1780 */ 1781 for (i = 0; i < adapter->slices; i++) { 1782 afu = adapter->afu[i]; 1783 /* Only participate in EEH if we are on a virtual PHB */ 1784 if (afu->phb == NULL) 1785 return PCI_ERS_RESULT_NONE; 1786 cxl_vphb_error_detected(afu, state); 1787 } 1788 return PCI_ERS_RESULT_DISCONNECT; 1789 } 1790 1791 /* Are we reflashing? 1792 * 1793 * If we reflash, we could come back as something entirely 1794 * different, including a non-CAPI card. As such, by default 1795 * we don't participate in the process. We'll be unbound and 1796 * the slot re-probed. (TODO: check EEH doesn't blindly rebind 1797 * us!) 1798 * 1799 * However, this isn't the entire story: for reliablity 1800 * reasons, we usually want to reflash the FPGA on PERST in 1801 * order to get back to a more reliable known-good state. 1802 * 1803 * This causes us a bit of a problem: if we reflash we can't 1804 * trust that we'll come back the same - we could have a new 1805 * image and been PERSTed in order to load that 1806 * image. However, most of the time we actually *will* come 1807 * back the same - for example a regular EEH event. 1808 * 1809 * Therefore, we allow the user to assert that the image is 1810 * indeed the same and that we should continue on into EEH 1811 * anyway. 1812 */ 1813 if (adapter->perst_loads_image && !adapter->perst_same_image) { 1814 /* TODO take the PHB out of CXL mode */ 1815 dev_info(&pdev->dev, "reflashing, so opting out of EEH!\n"); 1816 return PCI_ERS_RESULT_NONE; 1817 } 1818 1819 /* 1820 * At this point, we want to try to recover. We'll always 1821 * need a complete slot reset: we don't trust any other reset. 1822 * 1823 * Now, we go through each AFU: 1824 * - We send the driver, if bound, an error_detected callback. 1825 * We expect it to clean up, but it can also tell us to give 1826 * up and permanently detach the card. To simplify things, if 1827 * any bound AFU driver doesn't support EEH, we give up on EEH. 1828 * 1829 * - We detach all contexts associated with the AFU. This 1830 * does not free them, but puts them into a CLOSED state 1831 * which causes any the associated files to return useful 1832 * errors to userland. It also unmaps, but does not free, 1833 * any IRQs. 1834 * 1835 * - We clean up our side: releasing and unmapping resources we hold 1836 * so we can wire them up again when the hardware comes back up. 1837 * 1838 * Driver authors should note: 1839 * 1840 * - Any contexts you create in your kernel driver (except 1841 * those associated with anonymous file descriptors) are 1842 * your responsibility to free and recreate. Likewise with 1843 * any attached resources. 1844 * 1845 * - We will take responsibility for re-initialising the 1846 * device context (the one set up for you in 1847 * cxl_pci_enable_device_hook and accessed through 1848 * cxl_get_context). If you've attached IRQs or other 1849 * resources to it, they remains yours to free. 1850 * 1851 * You can call the same functions to release resources as you 1852 * normally would: we make sure that these functions continue 1853 * to work when the hardware is down. 1854 * 1855 * Two examples: 1856 * 1857 * 1) If you normally free all your resources at the end of 1858 * each request, or if you use anonymous FDs, your 1859 * error_detected callback can simply set a flag to tell 1860 * your driver not to start any new calls. You can then 1861 * clear the flag in the resume callback. 1862 * 1863 * 2) If you normally allocate your resources on startup: 1864 * * Set a flag in error_detected as above. 1865 * * Let CXL detach your contexts. 1866 * * In slot_reset, free the old resources and allocate new ones. 1867 * * In resume, clear the flag to allow things to start. 1868 */ 1869 for (i = 0; i < adapter->slices; i++) { 1870 afu = adapter->afu[i]; 1871 1872 result = cxl_vphb_error_detected(afu, state); 1873 1874 /* Only continue if everyone agrees on NEED_RESET */ 1875 if (result != PCI_ERS_RESULT_NEED_RESET) 1876 return result; 1877 1878 cxl_context_detach_all(afu); 1879 cxl_ops->afu_deactivate_mode(afu, afu->current_mode); 1880 pci_deconfigure_afu(afu); 1881 } 1882 cxl_deconfigure_adapter(adapter); 1883 1884 return result; 1885 } 1886 1887 static pci_ers_result_t cxl_pci_slot_reset(struct pci_dev *pdev) 1888 { 1889 struct cxl *adapter = pci_get_drvdata(pdev); 1890 struct cxl_afu *afu; 1891 struct cxl_context *ctx; 1892 struct pci_dev *afu_dev; 1893 pci_ers_result_t afu_result = PCI_ERS_RESULT_RECOVERED; 1894 pci_ers_result_t result = PCI_ERS_RESULT_RECOVERED; 1895 int i; 1896 1897 if (cxl_configure_adapter(adapter, pdev)) 1898 goto err; 1899 1900 for (i = 0; i < adapter->slices; i++) { 1901 afu = adapter->afu[i]; 1902 1903 if (pci_configure_afu(afu, adapter, pdev)) 1904 goto err; 1905 1906 if (cxl_afu_select_best_mode(afu)) 1907 goto err; 1908 1909 list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) { 1910 /* Reset the device context. 1911 * TODO: make this less disruptive 1912 */ 1913 ctx = cxl_get_context(afu_dev); 1914 1915 if (ctx && cxl_release_context(ctx)) 1916 goto err; 1917 1918 ctx = cxl_dev_context_init(afu_dev); 1919 if (!ctx) 1920 goto err; 1921 1922 afu_dev->dev.archdata.cxl_ctx = ctx; 1923 1924 if (cxl_ops->afu_check_and_enable(afu)) 1925 goto err; 1926 1927 afu_dev->error_state = pci_channel_io_normal; 1928 1929 /* If there's a driver attached, allow it to 1930 * chime in on recovery. Drivers should check 1931 * if everything has come back OK, but 1932 * shouldn't start new work until we call 1933 * their resume function. 1934 */ 1935 if (!afu_dev->driver) 1936 continue; 1937 1938 if (afu_dev->driver->err_handler && 1939 afu_dev->driver->err_handler->slot_reset) 1940 afu_result = afu_dev->driver->err_handler->slot_reset(afu_dev); 1941 1942 if (afu_result == PCI_ERS_RESULT_DISCONNECT) 1943 result = PCI_ERS_RESULT_DISCONNECT; 1944 } 1945 } 1946 return result; 1947 1948 err: 1949 /* All the bits that happen in both error_detected and cxl_remove 1950 * should be idempotent, so we don't need to worry about leaving a mix 1951 * of unconfigured and reconfigured resources. 1952 */ 1953 dev_err(&pdev->dev, "EEH recovery failed. Asking to be disconnected.\n"); 1954 return PCI_ERS_RESULT_DISCONNECT; 1955 } 1956 1957 static void cxl_pci_resume(struct pci_dev *pdev) 1958 { 1959 struct cxl *adapter = pci_get_drvdata(pdev); 1960 struct cxl_afu *afu; 1961 struct pci_dev *afu_dev; 1962 int i; 1963 1964 /* Everything is back now. Drivers should restart work now. 1965 * This is not the place to be checking if everything came back up 1966 * properly, because there's no return value: do that in slot_reset. 1967 */ 1968 for (i = 0; i < adapter->slices; i++) { 1969 afu = adapter->afu[i]; 1970 1971 list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) { 1972 if (afu_dev->driver && afu_dev->driver->err_handler && 1973 afu_dev->driver->err_handler->resume) 1974 afu_dev->driver->err_handler->resume(afu_dev); 1975 } 1976 } 1977 } 1978 1979 static const struct pci_error_handlers cxl_err_handler = { 1980 .error_detected = cxl_pci_error_detected, 1981 .slot_reset = cxl_pci_slot_reset, 1982 .resume = cxl_pci_resume, 1983 }; 1984 1985 struct pci_driver cxl_pci_driver = { 1986 .name = "cxl-pci", 1987 .id_table = cxl_pci_tbl, 1988 .probe = cxl_probe, 1989 .remove = cxl_remove, 1990 .shutdown = cxl_remove, 1991 .err_handler = &cxl_err_handler, 1992 }; 1993