drivers/vfio/pci/vfio_pci_zdev.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * VFIO ZPCI devices support
   4  *
   5  * Copyright (C) IBM Corp. 2020.  All rights reserved.
   6  *      Author(s): Pierre Morel <pmorel@linux.ibm.com>
   7  *                 Matthew Rosato <mjrosato@linux.ibm.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  */
  14 #include <linux/io.h>
  15 #include <linux/pci.h>
  16 #include <linux/uaccess.h>
  17 #include <linux/vfio.h>
  18 #include <linux/vfio_zdev.h>
  19 #include <asm/pci_clp.h>
  20 #include <asm/pci_io.h>
  21
  22 #include "vfio_pci_private.h"
  23
  24 /*
  25  * Add the Base PCI Function information to the device info region.
  26  */
  27 static int zpci_base_cap(struct zpci_dev *zdev, struct vfio_pci_device *vdev,
  28                          struct vfio_info_cap *caps)
  29 {
  30         struct vfio_device_info_cap_zpci_base cap = {
  31                 .header.id = VFIO_DEVICE_INFO_CAP_ZPCI_BASE,
  32                 .header.version = 1,
  33                 .start_dma = zdev->start_dma,
  34                 .end_dma = zdev->end_dma,
  35                 .pchid = zdev->pchid,
  36                 .vfn = zdev->vfn,
  37                 .fmb_length = zdev->fmb_length,
  38                 .pft = zdev->pft,
  39                 .gid = zdev->pfgid
  40         };
  41
  42         return vfio_info_add_capability(caps, &cap.header, sizeof(cap));
  43 }
  44
  45 /*
  46  * Add the Base PCI Function Group information to the device info region.
  47  */
  48 static int zpci_group_cap(struct zpci_dev *zdev, struct vfio_pci_device *vdev,
  49                           struct vfio_info_cap *caps)
  50 {
  51         struct vfio_device_info_cap_zpci_group cap = {
  52                 .header.id = VFIO_DEVICE_INFO_CAP_ZPCI_GROUP,
  53                 .header.version = 1,
  54                 .dasm = zdev->dma_mask,
  55                 .msi_addr = zdev->msi_addr,
  56                 .flags = VFIO_DEVICE_INFO_ZPCI_FLAG_REFRESH,
  57                 .mui = zdev->fmb_update,
  58                 .noi = zdev->max_msi,
  59                 .maxstbl = ZPCI_MAX_WRITE_SIZE,
  60                 .version = zdev->version
  61         };
  62
  63         return vfio_info_add_capability(caps, &cap.header, sizeof(cap));
  64 }
  65
  66 /*
  67  * Add the device utility string to the device info region.
  68  */
  69 static int zpci_util_cap(struct zpci_dev *zdev, struct vfio_pci_device *vdev,
  70                          struct vfio_info_cap *caps)
  71 {
  72         struct vfio_device_info_cap_zpci_util *cap;
  73         int cap_size = sizeof(*cap) + CLP_UTIL_STR_LEN;
  74         int ret;
  75
  76         cap = kmalloc(cap_size, GFP_KERNEL);
  77
  78         cap->header.id = VFIO_DEVICE_INFO_CAP_ZPCI_UTIL;
  79         cap->header.version = 1;
  80         cap->size = CLP_UTIL_STR_LEN;
  81         memcpy(cap->util_str, zdev->util_str, cap->size);
  82
  83         ret = vfio_info_add_capability(caps, &cap->header, cap_size);
  84
  85         kfree(cap);
  86
  87         return ret;
  88 }
  89
  90 /*
  91  * Add the function path string to the device info region.
  92  */
  93 static int zpci_pfip_cap(struct zpci_dev *zdev, struct vfio_pci_device *vdev,
  94                          struct vfio_info_cap *caps)
  95 {
  96         struct vfio_device_info_cap_zpci_pfip *cap;
  97         int cap_size = sizeof(*cap) + CLP_PFIP_NR_SEGMENTS;
  98         int ret;
  99
 100         cap = kmalloc(cap_size, GFP_KERNEL);
 101
 102         cap->header.id = VFIO_DEVICE_INFO_CAP_ZPCI_PFIP;
 103         cap->header.version = 1;
 104         cap->size = CLP_PFIP_NR_SEGMENTS;
 105         memcpy(cap->pfip, zdev->pfip, cap->size);
 106
 107         ret = vfio_info_add_capability(caps, &cap->header, cap_size);
 108
 109         kfree(cap);
 110
 111         return ret;
 112 }
 113
 114 /*
 115  * Add all supported capabilities to the VFIO_DEVICE_GET_INFO capability chain.
 116  */
 117 int vfio_pci_info_zdev_add_caps(struct vfio_pci_device *vdev,
 118                                 struct vfio_info_cap *caps)
 119 {
 120         struct zpci_dev *zdev = to_zpci(vdev->pdev);
 121         int ret;
 122
 123         if (!zdev)
 124                 return -ENODEV;
 125
 126         ret = zpci_base_cap(zdev, vdev, caps);
 127         if (ret)
 128                 return ret;
 129
 130         ret = zpci_group_cap(zdev, vdev, caps);
 131         if (ret)
 132                 return ret;
 133
 134         if (zdev->util_str_avail) {
 135                 ret = zpci_util_cap(zdev, vdev, caps);
 136                 if (ret)
 137                         return ret;
 138         }
 139
 140         ret = zpci_pfip_cap(zdev, vdev, caps);
 141
 142         return ret;
 143 }