drivers/misc/cxl/pci.c

   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 };