arch/s390/pci/pci_clp.c

   1 /*
   2  * Copyright IBM Corp. 2012
   3  *
   4  * Author(s):
   5  *   Jan Glauber <jang@linux.vnet.ibm.com>
   6  */
   7
   8 #define COMPONENT "zPCI"
   9 #define pr_fmt(fmt) COMPONENT ": " fmt
  10
  11 #include <linux/kernel.h>
  12 #include <linux/slab.h>
  13 #include <linux/err.h>
  14 #include <linux/delay.h>
  15 #include <linux/pci.h>
  16 #include <asm/pci_debug.h>
  17 #include <asm/pci_clp.h>
  18
  19 static inline void zpci_err_clp(unsigned int rsp, int rc)
  20 {
  21         struct {
  22                 unsigned int rsp;
  23                 int rc;
  24         } __packed data = {rsp, rc};
  25
  26         zpci_err_hex(&data, sizeof(data));
  27 }
  28
  29 /*
  30  * Call Logical Processor
  31  * Retry logic is handled by the caller.
  32  */
  33 static inline u8 clp_instr(void *data)
  34 {
  35         struct { u8 _[CLP_BLK_SIZE]; } *req = data;
  36         u64 ignored;
  37         u8 cc;
  38
  39         asm volatile (
  40                 "       .insn   rrf,0xb9a00000,%[ign],%[req],0x0,0x2\n"
  41                 "       ipm     %[cc]\n"
  42                 "       srl     %[cc],28\n"
  43                 : [cc] "=d" (cc), [ign] "=d" (ignored), "+m" (*req)
  44                 : [req] "a" (req)
  45                 : "cc");
  46         return cc;
  47 }
  48
  49 static void *clp_alloc_block(gfp_t gfp_mask)
  50 {
  51         return (void *) __get_free_pages(gfp_mask, get_order(CLP_BLK_SIZE));
  52 }
  53
  54 static void clp_free_block(void *ptr)
  55 {
  56         free_pages((unsigned long) ptr, get_order(CLP_BLK_SIZE));
  57 }
  58
  59 static void clp_store_query_pci_fngrp(struct zpci_dev *zdev,
  60                                       struct clp_rsp_query_pci_grp *response)
  61 {
  62         zdev->tlb_refresh = response->refresh;
  63         zdev->dma_mask = response->dasm;
  64         zdev->msi_addr = response->msia;
  65         zdev->fmb_update = response->mui;
  66
  67         switch (response->version) {
  68         case 1:
  69                 zdev->max_bus_speed = PCIE_SPEED_5_0GT;
  70                 break;
  71         default:
  72                 zdev->max_bus_speed = PCI_SPEED_UNKNOWN;
  73                 break;
  74         }
  75 }
  76
  77 static int clp_query_pci_fngrp(struct zpci_dev *zdev, u8 pfgid)
  78 {
  79         struct clp_req_rsp_query_pci_grp *rrb;
  80         int rc;
  81
  82         rrb = clp_alloc_block(GFP_KERNEL);
  83         if (!rrb)
  84                 return -ENOMEM;
  85
  86         memset(rrb, 0, sizeof(*rrb));
  87         rrb->request.hdr.len = sizeof(rrb->request);
  88         rrb->request.hdr.cmd = CLP_QUERY_PCI_FNGRP;
  89         rrb->response.hdr.len = sizeof(rrb->response);
  90         rrb->request.pfgid = pfgid;
  91
  92         rc = clp_instr(rrb);
  93         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
  94                 clp_store_query_pci_fngrp(zdev, &rrb->response);
  95         else {
  96                 zpci_err("Q PCI FGRP:\n");
  97                 zpci_err_clp(rrb->response.hdr.rsp, rc);
  98                 rc = -EIO;
  99         }
 100         clp_free_block(rrb);
 101         return rc;
 102 }
 103
 104 static int clp_store_query_pci_fn(struct zpci_dev *zdev,
 105                                   struct clp_rsp_query_pci *response)
 106 {
 107         int i;
 108
 109         for (i = 0; i < PCI_BAR_COUNT; i++) {
 110                 zdev->bars[i].val = le32_to_cpu(response->bar[i]);
 111                 zdev->bars[i].size = response->bar_size[i];
 112         }
 113         zdev->start_dma = response->sdma;
 114         zdev->end_dma = response->edma;
 115         zdev->pchid = response->pchid;
 116         zdev->pfgid = response->pfgid;
 117         zdev->pft = response->pft;
 118         zdev->vfn = response->vfn;
 119         zdev->uid = response->uid;
 120
 121         memcpy(zdev->pfip, response->pfip, sizeof(zdev->pfip));
 122         if (response->util_str_avail) {
 123                 memcpy(zdev->util_str, response->util_str,
 124                        sizeof(zdev->util_str));
 125         }
 126
 127         return 0;
 128 }
 129
 130 static int clp_query_pci_fn(struct zpci_dev *zdev, u32 fh)
 131 {
 132         struct clp_req_rsp_query_pci *rrb;
 133         int rc;
 134
 135         rrb = clp_alloc_block(GFP_KERNEL);
 136         if (!rrb)
 137                 return -ENOMEM;
 138
 139         memset(rrb, 0, sizeof(*rrb));
 140         rrb->request.hdr.len = sizeof(rrb->request);
 141         rrb->request.hdr.cmd = CLP_QUERY_PCI_FN;
 142         rrb->response.hdr.len = sizeof(rrb->response);
 143         rrb->request.fh = fh;
 144
 145         rc = clp_instr(rrb);
 146         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
 147                 rc = clp_store_query_pci_fn(zdev, &rrb->response);
 148                 if (rc)
 149                         goto out;
 150                 if (rrb->response.pfgid)
 151                         rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid);
 152         } else {
 153                 zpci_err("Q PCI FN:\n");
 154                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 155                 rc = -EIO;
 156         }
 157 out:
 158         clp_free_block(rrb);
 159         return rc;
 160 }
 161
 162 int clp_add_pci_device(u32 fid, u32 fh, int configured)
 163 {
 164         struct zpci_dev *zdev;
 165         int rc;
 166
 167         zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, configured);
 168         zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
 169         if (!zdev)
 170                 return -ENOMEM;
 171
 172         zdev->fh = fh;
 173         zdev->fid = fid;
 174
 175         /* Query function properties and update zdev */
 176         rc = clp_query_pci_fn(zdev, fh);
 177         if (rc)
 178                 goto error;
 179
 180         if (configured)
 181                 zdev->state = ZPCI_FN_STATE_CONFIGURED;
 182         else
 183                 zdev->state = ZPCI_FN_STATE_STANDBY;
 184
 185         rc = zpci_create_device(zdev);
 186         if (rc)
 187                 goto error;
 188         return 0;
 189
 190 error:
 191         kfree(zdev);
 192         return rc;
 193 }
 194
 195 /*
 196  * Enable/Disable a given PCI function defined by its function handle.
 197  */
 198 static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
 199 {
 200         struct clp_req_rsp_set_pci *rrb;
 201         int rc, retries = 100;
 202
 203         rrb = clp_alloc_block(GFP_KERNEL);
 204         if (!rrb)
 205                 return -ENOMEM;
 206
 207         do {
 208                 memset(rrb, 0, sizeof(*rrb));
 209                 rrb->request.hdr.len = sizeof(rrb->request);
 210                 rrb->request.hdr.cmd = CLP_SET_PCI_FN;
 211                 rrb->response.hdr.len = sizeof(rrb->response);
 212                 rrb->request.fh = *fh;
 213                 rrb->request.oc = command;
 214                 rrb->request.ndas = nr_dma_as;
 215
 216                 rc = clp_instr(rrb);
 217                 if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
 218                         retries--;
 219                         if (retries < 0)
 220                                 break;
 221                         msleep(20);
 222                 }
 223         } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
 224
 225         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
 226                 *fh = rrb->response.fh;
 227         else {
 228                 zpci_err("Set PCI FN:\n");
 229                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 230                 rc = -EIO;
 231         }
 232         clp_free_block(rrb);
 233         return rc;
 234 }
 235
 236 int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
 237 {
 238         u32 fh = zdev->fh;
 239         int rc;
 240
 241         rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
 242         if (!rc)
 243                 /* Success -> store enabled handle in zdev */
 244                 zdev->fh = fh;
 245
 246         zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
 247         return rc;
 248 }
 249
 250 int clp_disable_fh(struct zpci_dev *zdev)
 251 {
 252         u32 fh = zdev->fh;
 253         int rc;
 254
 255         if (!zdev_enabled(zdev))
 256                 return 0;
 257
 258         rc = clp_set_pci_fn(&fh, 0, CLP_SET_DISABLE_PCI_FN);
 259         if (!rc)
 260                 /* Success -> store disabled handle in zdev */
 261                 zdev->fh = fh;
 262
 263         zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
 264         return rc;
 265 }
 266
 267 static int clp_list_pci(struct clp_req_rsp_list_pci *rrb,
 268                         void (*cb)(struct clp_fh_list_entry *entry))
 269 {
 270         u64 resume_token = 0;
 271         int entries, i, rc;
 272
 273         do {
 274                 memset(rrb, 0, sizeof(*rrb));
 275                 rrb->request.hdr.len = sizeof(rrb->request);
 276                 rrb->request.hdr.cmd = CLP_LIST_PCI;
 277                 /* store as many entries as possible */
 278                 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
 279                 rrb->request.resume_token = resume_token;
 280
 281                 /* Get PCI function handle list */
 282                 rc = clp_instr(rrb);
 283                 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
 284                         zpci_err("List PCI FN:\n");
 285                         zpci_err_clp(rrb->response.hdr.rsp, rc);
 286                         rc = -EIO;
 287                         goto out;
 288                 }
 289
 290                 WARN_ON_ONCE(rrb->response.entry_size !=
 291                         sizeof(struct clp_fh_list_entry));
 292
 293                 entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
 294                         rrb->response.entry_size;
 295
 296                 resume_token = rrb->response.resume_token;
 297                 for (i = 0; i < entries; i++)
 298                         cb(&rrb->response.fh_list[i]);
 299         } while (resume_token);
 300 out:
 301         return rc;
 302 }
 303
 304 static void __clp_add(struct clp_fh_list_entry *entry)
 305 {
 306         if (!entry->vendor_id)
 307                 return;
 308
 309         clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
 310 }
 311
 312 static void __clp_rescan(struct clp_fh_list_entry *entry)
 313 {
 314         struct zpci_dev *zdev;
 315
 316         if (!entry->vendor_id)
 317                 return;
 318
 319         zdev = get_zdev_by_fid(entry->fid);
 320         if (!zdev) {
 321                 clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
 322                 return;
 323         }
 324
 325         if (!entry->config_state) {
 326                 /*
 327                  * The handle is already disabled, that means no iota/irq freeing via
 328                  * the firmware interfaces anymore. Need to free resources manually
 329                  * (DMA memory, debug, sysfs)...
 330                  */
 331                 zpci_stop_device(zdev);
 332         }
 333 }
 334
 335 static void __clp_update(struct clp_fh_list_entry *entry)
 336 {
 337         struct zpci_dev *zdev;
 338
 339         if (!entry->vendor_id)
 340                 return;
 341
 342         zdev = get_zdev_by_fid(entry->fid);
 343         if (!zdev)
 344                 return;
 345
 346         zdev->fh = entry->fh;
 347 }
 348
 349 int clp_scan_pci_devices(void)
 350 {
 351         struct clp_req_rsp_list_pci *rrb;
 352         int rc;
 353
 354         rrb = clp_alloc_block(GFP_KERNEL);
 355         if (!rrb)
 356                 return -ENOMEM;
 357
 358         rc = clp_list_pci(rrb, __clp_add);
 359
 360         clp_free_block(rrb);
 361         return rc;
 362 }
 363
 364 int clp_rescan_pci_devices(void)
 365 {
 366         struct clp_req_rsp_list_pci *rrb;
 367         int rc;
 368
 369         rrb = clp_alloc_block(GFP_KERNEL);
 370         if (!rrb)
 371                 return -ENOMEM;
 372
 373         rc = clp_list_pci(rrb, __clp_rescan);
 374
 375         clp_free_block(rrb);
 376         return rc;
 377 }
 378
 379 int clp_rescan_pci_devices_simple(void)
 380 {
 381         struct clp_req_rsp_list_pci *rrb;
 382         int rc;
 383
 384         rrb = clp_alloc_block(GFP_NOWAIT);
 385         if (!rrb)
 386                 return -ENOMEM;
 387
 388         rc = clp_list_pci(rrb, __clp_update);
 389
 390         clp_free_block(rrb);
 391         return rc;
 392 }