drivers/misc/cxl/of.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright 2015 IBM Corp.
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/module.h>
   8 #include <linux/platform_device.h>
   9 #include <linux/slab.h>
  10 #include <linux/of.h>
  11 #include <linux/of_address.h>
  12 #include <linux/of_platform.h>
  13
  14 #include "cxl.h"
  15
  16 static int read_phys_addr(struct device_node *np, char *prop_name,
  17                         struct cxl_afu *afu)
  18 {
  19         int i, len, entry_size, naddr, nsize, type;
  20         u64 addr, size;
  21         const __be32 *prop;
  22
  23         naddr = of_n_addr_cells(np);
  24         nsize = of_n_size_cells(np);
  25
  26         prop = of_get_property(np, prop_name, &len);
  27         if (prop) {
  28                 entry_size = naddr + nsize;
  29                 for (i = 0; i < (len / 4); i += entry_size, prop += entry_size) {
  30                         type = be32_to_cpu(prop[0]);
  31                         addr = of_read_number(prop, naddr);
  32                         size = of_read_number(&prop[naddr], nsize);
  33                         switch (type) {
  34                         case 0: /* unit address */
  35                                 afu->guest->handle = addr;
  36                                 break;
  37                         case 1: /* p2 area */
  38                                 afu->guest->p2n_phys += addr;
  39                                 afu->guest->p2n_size = size;
  40                                 break;
  41                         case 2: /* problem state area */
  42                                 afu->psn_phys += addr;
  43                                 afu->adapter->ps_size = size;
  44                                 break;
  45                         default:
  46                                 pr_err("Invalid address type %d found in %s property of AFU\n",
  47                                         type, prop_name);
  48                                 return -EINVAL;
  49                         }
  50                 }
  51         }
  52         return 0;
  53 }
  54
  55 static int read_vpd(struct cxl *adapter, struct cxl_afu *afu)
  56 {
  57         char vpd[256];
  58         int rc;
  59         size_t len = sizeof(vpd);
  60
  61         memset(vpd, 0, len);
  62
  63         if (adapter)
  64                 rc = cxl_guest_read_adapter_vpd(adapter, vpd, len);
  65         else
  66                 rc = cxl_guest_read_afu_vpd(afu, vpd, len);
  67
  68         if (rc > 0) {
  69                 cxl_dump_debug_buffer(vpd, rc);
  70                 rc = 0;
  71         }
  72         return rc;
  73 }
  74
  75 int cxl_of_read_afu_handle(struct cxl_afu *afu, struct device_node *afu_np)
  76 {
  77         return of_property_read_reg(afu_np, 0, &afu->guest->handle, NULL);
  78 }
  79
  80 int cxl_of_read_afu_properties(struct cxl_afu *afu, struct device_node *np)
  81 {
  82         int i, rc;
  83         u16 device_id, vendor_id;
  84         u32 val = 0, class_code;
  85
  86         /* Properties are read in the same order as listed in PAPR */
  87
  88         rc = read_phys_addr(np, "reg", afu);
  89         if (rc)
  90                 return rc;
  91
  92         rc = read_phys_addr(np, "assigned-addresses", afu);
  93         if (rc)
  94                 return rc;
  95
  96         if (afu->psn_phys == 0)
  97                 afu->psa = false;
  98         else
  99                 afu->psa = true;
 100
 101         of_property_read_u32(np, "ibm,#processes", &afu->max_procs_virtualised);
 102
 103         if (cxl_verbose)
 104                 read_vpd(NULL, afu);
 105
 106         of_property_read_u32(np, "ibm,max-ints-per-process", &afu->guest->max_ints);
 107         afu->irqs_max = afu->guest->max_ints;
 108
 109         if (!of_property_read_u32(np, "ibm,min-ints-per-process", &afu->pp_irqs)) {
 110                 /* One extra interrupt for the PSL interrupt is already
 111                  * included. Remove it now to keep only AFU interrupts and
 112                  * match the native case.
 113                  */
 114                 afu->pp_irqs--;
 115         }
 116
 117         of_property_read_u64(np, "ibm,error-buffer-size", &afu->eb_len);
 118         afu->eb_offset = 0;
 119
 120         of_property_read_u64(np, "ibm,config-record-size", &afu->crs_len);
 121         afu->crs_offset = 0;
 122
 123         of_property_read_u32(np, "ibm,#config-records", &afu->crs_num);
 124
 125         if (cxl_verbose) {
 126                 for (i = 0; i < afu->crs_num; i++) {
 127                         rc = cxl_ops->afu_cr_read16(afu, i, PCI_DEVICE_ID,
 128                                                 &device_id);
 129                         if (!rc)
 130                                 pr_info("record %d - device-id: %#x\n",
 131                                         i, device_id);
 132                         rc = cxl_ops->afu_cr_read16(afu, i, PCI_VENDOR_ID,
 133                                                 &vendor_id);
 134                         if (!rc)
 135                                 pr_info("record %d - vendor-id: %#x\n",
 136                                         i, vendor_id);
 137                         rc = cxl_ops->afu_cr_read32(afu, i, PCI_CLASS_REVISION,
 138                                                 &class_code);
 139                         if (!rc) {
 140                                 class_code >>= 8;
 141                                 pr_info("record %d - class-code: %#x\n",
 142                                         i, class_code);
 143                         }
 144                 }
 145         }
 146         /*
 147          * if "ibm,process-mmio" doesn't exist then per-process mmio is
 148          * not supported
 149          */
 150         val = 0;
 151         if (!of_property_read_u32(np, "ibm,process-mmio", &val) && val == 1)
 152                 afu->pp_psa = true;
 153         else
 154                 afu->pp_psa = false;
 155
 156         if (!of_property_read_u32(np, "ibm,function-error-interrupt", &val))
 157                 afu->serr_hwirq = val;
 158
 159         pr_devel("AFU handle: %#llx\n", afu->guest->handle);
 160         pr_devel("p2n_phys: %#llx (size %#llx)\n",
 161                 afu->guest->p2n_phys, afu->guest->p2n_size);
 162         pr_devel("psn_phys: %#llx (size %#llx)\n",
 163                 afu->psn_phys, afu->adapter->ps_size);
 164         pr_devel("Max number of processes virtualised=%i\n",
 165                 afu->max_procs_virtualised);
 166         pr_devel("Per-process irqs min=%i, max=%i\n", afu->pp_irqs,
 167                  afu->irqs_max);
 168         pr_devel("Slice error interrupt=%#lx\n", afu->serr_hwirq);
 169
 170         return 0;
 171 }
 172
 173 static int read_adapter_irq_config(struct cxl *adapter, struct device_node *np)
 174 {
 175         const __be32 *ranges;
 176         int len, nranges, i;
 177         struct irq_avail *cur;
 178
 179         ranges = of_get_property(np, "interrupt-ranges", &len);
 180         if (ranges == NULL || len < (2 * sizeof(int)))
 181                 return -EINVAL;
 182
 183         /*
 184          * encoded array of two cells per entry, each cell encoded as
 185          * with encode-int
 186          */
 187         nranges = len / (2 * sizeof(int));
 188         if (nranges == 0 || (nranges * 2 * sizeof(int)) != len)
 189                 return -EINVAL;
 190
 191         adapter->guest->irq_avail = kcalloc(nranges, sizeof(struct irq_avail),
 192                                             GFP_KERNEL);
 193         if (adapter->guest->irq_avail == NULL)
 194                 return -ENOMEM;
 195
 196         adapter->guest->irq_base_offset = be32_to_cpu(ranges[0]);
 197         for (i = 0; i < nranges; i++) {
 198                 cur = &adapter->guest->irq_avail[i];
 199                 cur->offset = be32_to_cpu(ranges[i * 2]);
 200                 cur->range  = be32_to_cpu(ranges[i * 2 + 1]);
 201                 cur->bitmap = bitmap_zalloc(cur->range, GFP_KERNEL);
 202                 if (cur->bitmap == NULL)
 203                         goto err;
 204                 if (cur->offset < adapter->guest->irq_base_offset)
 205                         adapter->guest->irq_base_offset = cur->offset;
 206                 if (cxl_verbose)
 207                         pr_info("available IRQ range: %#lx-%#lx (%lu)\n",
 208                                 cur->offset, cur->offset + cur->range - 1,
 209                                 cur->range);
 210         }
 211         adapter->guest->irq_nranges = nranges;
 212         spin_lock_init(&adapter->guest->irq_alloc_lock);
 213
 214         return 0;
 215 err:
 216         for (i--; i >= 0; i--) {
 217                 cur = &adapter->guest->irq_avail[i];
 218                 bitmap_free(cur->bitmap);
 219         }
 220         kfree(adapter->guest->irq_avail);
 221         adapter->guest->irq_avail = NULL;
 222         return -ENOMEM;
 223 }
 224
 225 int cxl_of_read_adapter_handle(struct cxl *adapter, struct device_node *np)
 226 {
 227         return of_property_read_reg(np, 0, &adapter->guest->handle, NULL);
 228 }
 229
 230 int cxl_of_read_adapter_properties(struct cxl *adapter, struct device_node *np)
 231 {
 232         int rc;
 233         const char *p;
 234         u32 val = 0;
 235
 236         /* Properties are read in the same order as listed in PAPR */
 237
 238         if ((rc = read_adapter_irq_config(adapter, np)))
 239                 return rc;
 240
 241         if (!of_property_read_u32(np, "ibm,caia-version", &val)) {
 242                 adapter->caia_major = (val & 0xFF00) >> 8;
 243                 adapter->caia_minor = val & 0xFF;
 244         }
 245
 246         if (!of_property_read_u32(np, "ibm,psl-revision", &val))
 247                 adapter->psl_rev = val;
 248
 249         if (!of_property_read_string(np, "status", &p)) {
 250                 adapter->guest->status = kasprintf(GFP_KERNEL, "%s", p);
 251                 if (adapter->guest->status == NULL)
 252                         return -ENOMEM;
 253         }
 254
 255         if (!of_property_read_u32(np, "vendor-id", &val))
 256                 adapter->guest->vendor = val;
 257
 258         if (!of_property_read_u32(np, "device-id", &val))
 259                 adapter->guest->device = val;
 260
 261         if (!of_property_read_u32(np, "subsystem-vendor-id", &val))
 262                 adapter->guest->subsystem_vendor = val;
 263
 264         if (!of_property_read_u32(np, "subsystem-id", &val))
 265                 adapter->guest->subsystem = val;
 266
 267         if (cxl_verbose)
 268                 read_vpd(adapter, NULL);
 269
 270         return 0;
 271 }
 272
 273 static void cxl_of_remove(struct platform_device *pdev)
 274 {
 275         struct cxl *adapter;
 276         int afu;
 277
 278         adapter = dev_get_drvdata(&pdev->dev);
 279         for (afu = 0; afu < adapter->slices; afu++)
 280                 cxl_guest_remove_afu(adapter->afu[afu]);
 281
 282         cxl_guest_remove_adapter(adapter);
 283 }
 284
 285 static void cxl_of_shutdown(struct platform_device *pdev)
 286 {
 287         cxl_of_remove(pdev);
 288 }
 289
 290 int cxl_of_probe(struct platform_device *pdev)
 291 {
 292         struct device_node *np = NULL;
 293         struct device_node *afu_np = NULL;
 294         struct cxl *adapter = NULL;
 295         int ret;
 296         int slice = 0, slice_ok = 0;
 297
 298         dev_err_once(&pdev->dev, "DEPRECATION: cxl is deprecated and will be removed in a future kernel release\n");
 299
 300         pr_devel("in %s\n", __func__);
 301
 302         np = pdev->dev.of_node;
 303         if (np == NULL)
 304                 return -ENODEV;
 305
 306         /* init adapter */
 307         adapter = cxl_guest_init_adapter(np, pdev);
 308         if (IS_ERR(adapter)) {
 309                 dev_err(&pdev->dev, "guest_init_adapter failed: %li\n", PTR_ERR(adapter));
 310                 return PTR_ERR(adapter);
 311         }
 312
 313         /* init afu */
 314         for_each_child_of_node(np, afu_np) {
 315                 if ((ret = cxl_guest_init_afu(adapter, slice, afu_np)))
 316                         dev_err(&pdev->dev, "AFU %i failed to initialise: %i\n",
 317                                 slice, ret);
 318                 else
 319                         slice_ok++;
 320                 slice++;
 321         }
 322
 323         if (slice_ok == 0) {
 324                 dev_info(&pdev->dev, "No active AFU");
 325                 adapter->slices = 0;
 326         }
 327
 328         return 0;
 329 }
 330
 331 static const struct of_device_id cxl_of_match[] = {
 332         { .compatible = "ibm,coherent-platform-facility",},
 333         {},
 334 };
 335 MODULE_DEVICE_TABLE(of, cxl_of_match);
 336
 337 struct platform_driver cxl_of_driver = {
 338         .driver = {
 339                 .name = "cxl_of",
 340                 .of_match_table = cxl_of_match,
 341                 .owner = THIS_MODULE
 342         },
 343         .probe = cxl_of_probe,
 344         .remove = cxl_of_remove,
 345         .shutdown = cxl_of_shutdown,
 346 };