Line data    Source code

       1             : /*   SPDX-License-Identifier: BSD-3-Clause
       2             :  *   Copyright (C) 2021 Intel Corporation.
       3             :  *   All rights reserved.
       4             :  */
       5             : 
       6             : #include "spdk/stdinc.h"
       7             : 
       8             : #include <accel-config/libaccel_config.h>
       9             : 
      10             : #include "spdk/env.h"
      11             : #include "spdk/util.h"
      12             : #include "spdk/memory.h"
      13             : #include "spdk/likely.h"
      14             : 
      15             : #include "spdk/log.h"
      16             : #include "spdk_internal/idxd.h"
      17             : 
      18             : #include "idxd_internal.h"
      19             : 
      20             : struct spdk_kernel_idxd_device {
      21             :         struct spdk_idxd_device idxd;
      22             :         struct accfg_ctx        *ctx;
      23             : 
      24             :         unsigned int            max_batch_size;
      25             :         unsigned int            max_xfer_size;
      26             :         unsigned int            max_xfer_bits;
      27             : 
      28             :         /* We only use a single WQ */
      29             :         struct accfg_wq         *wq;
      30             :         int                     fd;
      31             :         void                    *portal;
      32             : };
      33             : 
      34             : #define __kernel_idxd(idxd) SPDK_CONTAINEROF(idxd, struct spdk_kernel_idxd_device, idxd)
      35             : 
      36             : static void
      37           0 : kernel_idxd_device_destruct(struct spdk_idxd_device *idxd)
      38             : {
      39           0 :         struct spdk_kernel_idxd_device *kernel_idxd = __kernel_idxd(idxd);
      40             : 
      41           0 :         if (kernel_idxd->portal != NULL) {
      42           0 :                 munmap(kernel_idxd->portal, 0x1000);
      43           0 :         }
      44             : 
      45           0 :         if (kernel_idxd->fd >= 0) {
      46           0 :                 close(kernel_idxd->fd);
      47           0 :         }
      48             : 
      49           0 :         accfg_unref(kernel_idxd->ctx);
      50           0 :         free(kernel_idxd);
      51           0 : }
      52             : 
      53             : static struct spdk_idxd_impl g_kernel_idxd_impl;
      54             : 
      55             : static int
      56           0 : kernel_idxd_probe(void *cb_ctx, spdk_idxd_attach_cb attach_cb, spdk_idxd_probe_cb probe_cb)
      57             : {
      58           0 :         int rc;
      59           0 :         struct accfg_ctx *ctx;
      60           0 :         struct accfg_device *device;
      61             : 
      62             :         /* Create a configuration context, incrementing the reference count. */
      63           0 :         rc = accfg_new(&ctx);
      64           0 :         if (rc < 0) {
      65           0 :                 SPDK_ERRLOG("Unable to allocate accel-config context\n");
      66           0 :                 return rc;
      67             :         }
      68             : 
      69             :         /* Loop over each IDXD device */
      70           0 :         accfg_device_foreach(ctx, device) {
      71           0 :                 enum accfg_device_state dstate;
      72           0 :                 struct spdk_kernel_idxd_device *kernel_idxd;
      73           0 :                 struct accfg_wq *wq;
      74           0 :                 bool pasid_enabled;
      75             : 
      76             :                 /* Make sure that the device is enabled */
      77           0 :                 dstate = accfg_device_get_state(device);
      78           0 :                 if (dstate != ACCFG_DEVICE_ENABLED) {
      79           0 :                         continue;
      80             :                 }
      81             : 
      82           0 :                 pasid_enabled = accfg_device_get_pasid_enabled(device);
      83           0 :                 if (!pasid_enabled && spdk_iommu_is_enabled()) {
      84             :                         /*
      85             :                          * If the IOMMU is enabled but shared memory mode is not on,
      86             :                          * then we have no way to get the IOVA from userspace to use this
      87             :                          * device or any kernel device. Return an error.
      88             :                          */
      89           0 :                         SPDK_ERRLOG("Found kernel IDXD device, but cannot use it when IOMMU is enabled but SM is disabled\n");
      90           0 :                         return -ENOTSUP;
      91             :                 }
      92             : 
      93           0 :                 kernel_idxd = calloc(1, sizeof(struct spdk_kernel_idxd_device));
      94           0 :                 if (kernel_idxd == NULL) {
      95           0 :                         SPDK_ERRLOG("Failed to allocate memory for kernel_idxd device.\n");
      96             :                         /* TODO: Goto error cleanup */
      97           0 :                         return -ENOMEM;
      98             :                 }
      99             : 
     100           0 :                 kernel_idxd->max_batch_size = accfg_device_get_max_batch_size(device);
     101           0 :                 kernel_idxd->max_xfer_size = accfg_device_get_max_transfer_size(device);
     102           0 :                 kernel_idxd->idxd.socket_id = accfg_device_get_numa_node(device);
     103           0 :                 kernel_idxd->idxd.impl = &g_kernel_idxd_impl;
     104           0 :                 kernel_idxd->fd = -1;
     105           0 :                 kernel_idxd->idxd.version = accfg_device_get_version(device);
     106           0 :                 kernel_idxd->idxd.pasid_enabled = pasid_enabled;
     107             : 
     108             :                 /* Increment configuration context reference for each device. */
     109           0 :                 kernel_idxd->ctx = accfg_ref(kernel_idxd->ctx);
     110             : 
     111           0 :                 accfg_wq_foreach(device, wq) {
     112           0 :                         enum accfg_wq_state wstate;
     113           0 :                         enum accfg_wq_mode mode;
     114           0 :                         enum accfg_wq_type type;
     115           0 :                         int major, minor;
     116           0 :                         char path[1024];
     117             : 
     118           0 :                         wstate = accfg_wq_get_state(wq);
     119           0 :                         if (wstate != ACCFG_WQ_ENABLED) {
     120           0 :                                 continue;
     121             :                         }
     122             : 
     123           0 :                         type = accfg_wq_get_type(wq);
     124           0 :                         if (type != ACCFG_WQT_USER) {
     125           0 :                                 continue;
     126             :                         }
     127             : 
     128             :                         /* TODO: For now, only support dedicated WQ */
     129           0 :                         mode = accfg_wq_get_mode(wq);
     130           0 :                         if (mode != ACCFG_WQ_DEDICATED) {
     131           0 :                                 continue;
     132             :                         }
     133             : 
     134           0 :                         major = accfg_device_get_cdev_major(device);
     135           0 :                         if (major < 0) {
     136           0 :                                 continue;
     137             :                         }
     138             : 
     139           0 :                         minor = accfg_wq_get_cdev_minor(wq);
     140           0 :                         if (minor < 0) {
     141           0 :                                 continue;
     142             :                         }
     143             : 
     144             :                         /* Map the portal */
     145           0 :                         snprintf(path, sizeof(path), "/dev/char/%u:%u", major, minor);
     146           0 :                         kernel_idxd->fd = open(path, O_RDWR);
     147           0 :                         if (kernel_idxd->fd < 0) {
     148           0 :                                 SPDK_ERRLOG("Can not open the WQ file descriptor on path=%s\n",
     149             :                                             path);
     150           0 :                                 continue;
     151             :                         }
     152             : 
     153           0 :                         kernel_idxd->portal = mmap(NULL, 0x1000, PROT_WRITE,
     154           0 :                                                    MAP_SHARED | MAP_POPULATE, kernel_idxd->fd, 0);
     155           0 :                         if (kernel_idxd->portal == MAP_FAILED) {
     156           0 :                                 if (errno == EPERM) {
     157           0 :                                         SPDK_ERRLOG("CAP_SYS_RAWIO capabilities required to mmap the portal\n");
     158           0 :                                 }
     159           0 :                                 perror("mmap");
     160           0 :                                 continue;
     161             :                         }
     162             : 
     163           0 :                         kernel_idxd->wq = wq;
     164             : 
     165             :                         /* Since we only use a single WQ, the total size is the size of this WQ */
     166           0 :                         kernel_idxd->idxd.total_wq_size = accfg_wq_get_size(wq);
     167           0 :                         kernel_idxd->idxd.chan_per_device = (kernel_idxd->idxd.total_wq_size >= 128) ? 8 : 4;
     168             : 
     169           0 :                         kernel_idxd->idxd.batch_size = accfg_wq_get_max_batch_size(wq);
     170             : 
     171             :                         /* We only use a single WQ, so once we've found one we can stop looking. */
     172           0 :                         break;
     173           0 :                 }
     174             : 
     175           0 :                 if (kernel_idxd->idxd.total_wq_size > 0) {
     176             :                         /* This device has at least 1 WQ available, so ask the user if they want to use it. */
     177           0 :                         attach_cb(cb_ctx, &kernel_idxd->idxd);
     178           0 :                 } else {
     179           0 :                         kernel_idxd_device_destruct(&kernel_idxd->idxd);
     180             :                 }
     181           0 :         }
     182             : 
     183             :         /* Release the reference used for configuration. */
     184           0 :         accfg_unref(ctx);
     185             : 
     186           0 :         return 0;
     187           0 : }
     188             : 
     189             : static void
     190           0 : kernel_idxd_dump_sw_error(struct spdk_idxd_device *idxd, void *portal)
     191             : {
     192             :         /* Need to be enhanced later */
     193           0 : }
     194             : 
     195             : static char *
     196           0 : kernel_idxd_portal_get_addr(struct spdk_idxd_device *idxd)
     197             : {
     198           0 :         struct spdk_kernel_idxd_device *kernel_idxd = __kernel_idxd(idxd);
     199             : 
     200           0 :         return kernel_idxd->portal;
     201           0 : }
     202             : 
     203             : static struct spdk_idxd_impl g_kernel_idxd_impl = {
     204             :         .name                   = "kernel",
     205             :         .probe                  = kernel_idxd_probe,
     206             :         .destruct               = kernel_idxd_device_destruct,
     207             :         .dump_sw_error          = kernel_idxd_dump_sw_error,
     208             :         .portal_get_addr        = kernel_idxd_portal_get_addr,
     209             : };
     210             : 
     211           0 : SPDK_IDXD_IMPL_REGISTER(kernel, &g_kernel_idxd_impl);