drivers/raw/ioat/idxd_pci.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2020 Intel Corporation
   3  */
   4
   5 #include <rte_bus_pci.h>
   6 #include <rte_memzone.h>
   7
   8 #include "ioat_private.h"
   9 #include "ioat_spec.h"
  10
  11 #define IDXD_VENDOR_ID          0x8086
  12 #define IDXD_DEVICE_ID_SPR      0x0B25
  13
  14 #define IDXD_PMD_RAWDEV_NAME_PCI rawdev_idxd_pci
  15
  16 const struct rte_pci_id pci_id_idxd_map[] = {
  17         { RTE_PCI_DEVICE(IDXD_VENDOR_ID, IDXD_DEVICE_ID_SPR) },
  18         { .vendor_id = 0, /* sentinel */ },
  19 };
  20
  21 static inline int
  22 idxd_pci_dev_command(struct idxd_rawdev *idxd, enum rte_idxd_cmds command)
  23 {
  24         uint8_t err_code;
  25         uint16_t qid = idxd->qid;
  26         int i = 0;
  27
  28         if (command >= idxd_disable_wq && command <= idxd_reset_wq)
  29                 qid = (1 << qid);
  30         rte_spinlock_lock(&idxd->u.pci->lk);
  31         idxd->u.pci->regs->cmd = (command << IDXD_CMD_SHIFT) | qid;
  32
  33         do {
  34                 rte_pause();
  35                 err_code = idxd->u.pci->regs->cmdstatus;
  36                 if (++i >= 1000) {
  37                         IOAT_PMD_ERR("Timeout waiting for command response from HW");
  38                         rte_spinlock_unlock(&idxd->u.pci->lk);
  39                         return err_code;
  40                 }
  41         } while (idxd->u.pci->regs->cmdstatus & CMDSTATUS_ACTIVE_MASK);
  42         rte_spinlock_unlock(&idxd->u.pci->lk);
  43
  44         return err_code & CMDSTATUS_ERR_MASK;
  45 }
  46
  47 static int
  48 idxd_is_wq_enabled(struct idxd_rawdev *idxd)
  49 {
  50         uint32_t state = idxd->u.pci->wq_regs[idxd->qid].wqcfg[WQ_STATE_IDX];
  51         return ((state >> WQ_STATE_SHIFT) & WQ_STATE_MASK) == 0x1;
  52 }
  53
  54 static const struct rte_rawdev_ops idxd_pci_ops = {
  55                 .dev_close = idxd_rawdev_close,
  56                 .dev_selftest = idxd_rawdev_test,
  57 };
  58
  59 /* each portal uses 4 x 4k pages */
  60 #define IDXD_PORTAL_SIZE (4096 * 4)
  61
  62 static int
  63 init_pci_device(struct rte_pci_device *dev, struct idxd_rawdev *idxd)
  64 {
  65         struct idxd_pci_common *pci;
  66         uint8_t nb_groups, nb_engines, nb_wqs;
  67         uint16_t grp_offset, wq_offset; /* how far into bar0 the regs are */
  68         uint16_t wq_size, total_wq_size;
  69         uint8_t lg2_max_batch, lg2_max_copy_size;
  70         unsigned int i, err_code;
  71
  72         pci = malloc(sizeof(*pci));
  73         if (pci == NULL) {
  74                 IOAT_PMD_ERR("%s: Can't allocate memory", __func__);
  75                 goto err;
  76         }
  77         rte_spinlock_init(&pci->lk);
  78
  79         /* assign the bar registers, and then configure device */
  80         pci->regs = dev->mem_resource[0].addr;
  81         grp_offset = (uint16_t)pci->regs->offsets[0];
  82         pci->grp_regs = RTE_PTR_ADD(pci->regs, grp_offset * 0x100);
  83         wq_offset = (uint16_t)(pci->regs->offsets[0] >> 16);
  84         pci->wq_regs = RTE_PTR_ADD(pci->regs, wq_offset * 0x100);
  85         pci->portals = dev->mem_resource[2].addr;
  86
  87         /* sanity check device status */
  88         if (pci->regs->gensts & GENSTS_DEV_STATE_MASK) {
  89                 /* need function-level-reset (FLR) or is enabled */
  90                 IOAT_PMD_ERR("Device status is not disabled, cannot init");
  91                 goto err;
  92         }
  93         if (pci->regs->cmdstatus & CMDSTATUS_ACTIVE_MASK) {
  94                 /* command in progress */
  95                 IOAT_PMD_ERR("Device has a command in progress, cannot init");
  96                 goto err;
  97         }
  98
  99         /* read basic info about the hardware for use when configuring */
 100         nb_groups = (uint8_t)pci->regs->grpcap;
 101         nb_engines = (uint8_t)pci->regs->engcap;
 102         nb_wqs = (uint8_t)(pci->regs->wqcap >> 16);
 103         total_wq_size = (uint16_t)pci->regs->wqcap;
 104         lg2_max_copy_size = (uint8_t)(pci->regs->gencap >> 16) & 0x1F;
 105         lg2_max_batch = (uint8_t)(pci->regs->gencap >> 21) & 0x0F;
 106
 107         IOAT_PMD_DEBUG("nb_groups = %u, nb_engines = %u, nb_wqs = %u",
 108                         nb_groups, nb_engines, nb_wqs);
 109
 110         /* zero out any old config */
 111         for (i = 0; i < nb_groups; i++) {
 112                 pci->grp_regs[i].grpengcfg = 0;
 113                 pci->grp_regs[i].grpwqcfg[0] = 0;
 114         }
 115         for (i = 0; i < nb_wqs; i++)
 116                 pci->wq_regs[i].wqcfg[0] = 0;
 117
 118         /* put each engine into a separate group to avoid reordering */
 119         if (nb_groups > nb_engines)
 120                 nb_groups = nb_engines;
 121         if (nb_groups < nb_engines)
 122                 nb_engines = nb_groups;
 123
 124         /* assign engines to groups, round-robin style */
 125         for (i = 0; i < nb_engines; i++) {
 126                 IOAT_PMD_DEBUG("Assigning engine %u to group %u",
 127                                 i, i % nb_groups);
 128                 pci->grp_regs[i % nb_groups].grpengcfg |= (1ULL << i);
 129         }
 130
 131         /* now do the same for queues and give work slots to each queue */
 132         wq_size = total_wq_size / nb_wqs;
 133         IOAT_PMD_DEBUG("Work queue size = %u, max batch = 2^%u, max copy = 2^%u",
 134                         wq_size, lg2_max_batch, lg2_max_copy_size);
 135         for (i = 0; i < nb_wqs; i++) {
 136                 /* add engine "i" to a group */
 137                 IOAT_PMD_DEBUG("Assigning work queue %u to group %u",
 138                                 i, i % nb_groups);
 139                 pci->grp_regs[i % nb_groups].grpwqcfg[0] |= (1ULL << i);
 140                 /* now configure it, in terms of size, max batch, mode */
 141                 pci->wq_regs[i].wqcfg[WQ_SIZE_IDX] = wq_size;
 142                 pci->wq_regs[i].wqcfg[WQ_MODE_IDX] = (1 << WQ_PRIORITY_SHIFT) |
 143                                 WQ_MODE_DEDICATED;
 144                 pci->wq_regs[i].wqcfg[WQ_SIZES_IDX] = lg2_max_copy_size |
 145                                 (lg2_max_batch << WQ_BATCH_SZ_SHIFT);
 146         }
 147
 148         /* dump the group configuration to output */
 149         for (i = 0; i < nb_groups; i++) {
 150                 IOAT_PMD_DEBUG("## Group %d", i);
 151                 IOAT_PMD_DEBUG("    GRPWQCFG: %"PRIx64, pci->grp_regs[i].grpwqcfg[0]);
 152                 IOAT_PMD_DEBUG("    GRPENGCFG: %"PRIx64, pci->grp_regs[i].grpengcfg);
 153                 IOAT_PMD_DEBUG("    GRPFLAGS: %"PRIx32, pci->grp_regs[i].grpflags);
 154         }
 155
 156         idxd->u.pci = pci;
 157         idxd->max_batches = wq_size;
 158
 159         /* enable the device itself */
 160         err_code = idxd_pci_dev_command(idxd, idxd_enable_dev);
 161         if (err_code) {
 162                 IOAT_PMD_ERR("Error enabling device: code %#x", err_code);
 163                 return err_code;
 164         }
 165         IOAT_PMD_DEBUG("IDXD Device enabled OK");
 166
 167         return nb_wqs;
 168
 169 err:
 170         free(pci);
 171         return -1;
 172 }
 173
 174 static int
 175 idxd_rawdev_probe_pci(struct rte_pci_driver *drv, struct rte_pci_device *dev)
 176 {
 177         struct idxd_rawdev idxd = {{0}}; /* Double {} to avoid error on BSD12 */
 178         uint8_t nb_wqs;
 179         int qid, ret = 0;
 180         char name[PCI_PRI_STR_SIZE];
 181
 182         rte_pci_device_name(&dev->addr, name, sizeof(name));
 183         IOAT_PMD_INFO("Init %s on NUMA node %d", name, dev->device.numa_node);
 184         dev->device.driver = &drv->driver;
 185
 186         ret = init_pci_device(dev, &idxd);
 187         if (ret < 0) {
 188                 IOAT_PMD_ERR("Error initializing PCI hardware");
 189                 return ret;
 190         }
 191         nb_wqs = (uint8_t)ret;
 192
 193         /* set up one device for each queue */
 194         for (qid = 0; qid < nb_wqs; qid++) {
 195                 char qname[32];
 196
 197                 /* add the queue number to each device name */
 198                 snprintf(qname, sizeof(qname), "%s-q%d", name, qid);
 199                 idxd.qid = qid;
 200                 idxd.public.portal = RTE_PTR_ADD(idxd.u.pci->portals,
 201                                 qid * IDXD_PORTAL_SIZE);
 202                 if (idxd_is_wq_enabled(&idxd))
 203                         IOAT_PMD_ERR("Error, WQ %u seems enabled", qid);
 204                 ret = idxd_rawdev_create(qname, &dev->device,
 205                                 &idxd, &idxd_pci_ops);
 206                 if (ret != 0) {
 207                         IOAT_PMD_ERR("Failed to create rawdev %s", name);
 208                         if (qid == 0) /* if no devices using this, free pci */
 209                                 free(idxd.u.pci);
 210                         return ret;
 211                 }
 212         }
 213
 214         return 0;
 215 }
 216
 217 static int
 218 idxd_rawdev_destroy(const char *name)
 219 {
 220         int ret;
 221         uint8_t err_code;
 222         struct rte_rawdev *rdev;
 223         struct idxd_rawdev *idxd;
 224
 225         if (!name) {
 226                 IOAT_PMD_ERR("Invalid device name");
 227                 return -EINVAL;
 228         }
 229
 230         rdev = rte_rawdev_pmd_get_named_dev(name);
 231         if (!rdev) {
 232                 IOAT_PMD_ERR("Invalid device name (%s)", name);
 233                 return -EINVAL;
 234         }
 235
 236         idxd = rdev->dev_private;
 237
 238         /* disable the device */
 239         err_code = idxd_pci_dev_command(idxd, idxd_disable_dev);
 240         if (err_code) {
 241                 IOAT_PMD_ERR("Error disabling device: code %#x", err_code);
 242                 return err_code;
 243         }
 244         IOAT_PMD_DEBUG("IDXD Device disabled OK");
 245
 246         /* free device memory */
 247         if (rdev->dev_private != NULL) {
 248                 IOAT_PMD_DEBUG("Freeing device driver memory");
 249                 rdev->dev_private = NULL;
 250                 rte_free(idxd->public.batch_ring);
 251                 rte_free(idxd->public.hdl_ring);
 252                 rte_memzone_free(idxd->mz);
 253         }
 254
 255         /* rte_rawdev_close is called by pmd_release */
 256         ret = rte_rawdev_pmd_release(rdev);
 257         if (ret)
 258                 IOAT_PMD_DEBUG("Device cleanup failed");
 259
 260         return 0;
 261 }
 262
 263 static int
 264 idxd_rawdev_remove_pci(struct rte_pci_device *dev)
 265 {
 266         char name[PCI_PRI_STR_SIZE];
 267         int ret = 0;
 268
 269         rte_pci_device_name(&dev->addr, name, sizeof(name));
 270
 271         IOAT_PMD_INFO("Closing %s on NUMA node %d",
 272                         name, dev->device.numa_node);
 273
 274         ret = idxd_rawdev_destroy(name);
 275
 276         return ret;
 277 }
 278
 279 struct rte_pci_driver idxd_pmd_drv_pci = {
 280         .id_table = pci_id_idxd_map,
 281         .drv_flags = RTE_PCI_DRV_NEED_MAPPING,
 282         .probe = idxd_rawdev_probe_pci,
 283         .remove = idxd_rawdev_remove_pci,
 284 };
 285
 286 RTE_PMD_REGISTER_PCI(IDXD_PMD_RAWDEV_NAME_PCI, idxd_pmd_drv_pci);
 287 RTE_PMD_REGISTER_PCI_TABLE(IDXD_PMD_RAWDEV_NAME_PCI, pci_id_idxd_map);
 288 RTE_PMD_REGISTER_KMOD_DEP(IDXD_PMD_RAWDEV_NAME_PCI,
 289                           "* igb_uio | uio_pci_generic | vfio-pci");