drivers/tee/tee-uclass.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2018 Linaro Limited
   4  */
   5
   6 #include <common.h>
   7 #include <dm.h>
   8 #include <malloc.h>
   9 #include <tee.h>
  10 #include <dm/device-internal.h>
  11 #include <dm/uclass-internal.h>
  12
  13 /**
  14  * struct tee_uclass_priv - information of a TEE, stored by the uclass
  15  *
  16  * @list_shm:   list of structe tee_shm representing memory blocks shared
  17  *              with the TEE.
  18  */
  19 struct tee_uclass_priv {
  20         struct list_head list_shm;
  21 };
  22
  23 static const struct tee_driver_ops *tee_get_ops(struct udevice *dev)
  24 {
  25         return device_get_ops(dev);
  26 }
  27
  28 void tee_get_version(struct udevice *dev, struct tee_version_data *vers)
  29 {
  30         tee_get_ops(dev)->get_version(dev, vers);
  31 }
  32
  33 int tee_open_session(struct udevice *dev, struct tee_open_session_arg *arg,
  34                      uint num_param, struct tee_param *param)
  35 {
  36         return tee_get_ops(dev)->open_session(dev, arg, num_param, param);
  37 }
  38
  39 int tee_close_session(struct udevice *dev, u32 session)
  40 {
  41         return tee_get_ops(dev)->close_session(dev, session);
  42 }
  43
  44 int tee_invoke_func(struct udevice *dev, struct tee_invoke_arg *arg,
  45                     uint num_param, struct tee_param *param)
  46 {
  47         return tee_get_ops(dev)->invoke_func(dev, arg, num_param, param);
  48 }
  49
  50 int __tee_shm_add(struct udevice *dev, ulong align, void *addr, ulong size,
  51                   u32 flags, struct tee_shm **shmp)
  52 {
  53         struct tee_shm *shm;
  54         void *p = addr;
  55         int rc;
  56
  57         if (flags & TEE_SHM_ALLOC) {
  58                 if (align)
  59                         p = memalign(align, size);
  60                 else
  61                         p = malloc(size);
  62         }
  63         if (!p)
  64                 return -ENOMEM;
  65
  66         shm = calloc(1, sizeof(*shm));
  67         if (!shm) {
  68                 rc = -ENOMEM;
  69                 goto err;
  70         }
  71
  72         shm->dev = dev;
  73         shm->addr = p;
  74         shm->size = size;
  75         shm->flags = flags;
  76
  77         if (flags & TEE_SHM_SEC_REGISTER) {
  78                 rc = tee_get_ops(dev)->shm_register(dev, shm);
  79                 if (rc)
  80                         goto err;
  81         }
  82
  83         if (flags & TEE_SHM_REGISTER) {
  84                 struct tee_uclass_priv *priv = dev_get_uclass_priv(dev);
  85
  86                 list_add(&shm->link, &priv->list_shm);
  87         }
  88
  89         *shmp = shm;
  90
  91         return 0;
  92 err:
  93         free(shm);
  94         if (flags & TEE_SHM_ALLOC)
  95                 free(p);
  96
  97         return rc;
  98 }
  99
 100 int tee_shm_alloc(struct udevice *dev, ulong size, u32 flags,
 101                   struct tee_shm **shmp)
 102 {
 103         u32 f = flags;
 104
 105         f |= TEE_SHM_SEC_REGISTER | TEE_SHM_REGISTER | TEE_SHM_ALLOC;
 106
 107         return __tee_shm_add(dev, 0, NULL, size, f, shmp);
 108 }
 109
 110 int tee_shm_register(struct udevice *dev, void *addr, ulong size, u32 flags,
 111                      struct tee_shm **shmp)
 112 {
 113         u32 f = flags & ~TEE_SHM_ALLOC;
 114
 115         f |= TEE_SHM_SEC_REGISTER | TEE_SHM_REGISTER;
 116
 117         return __tee_shm_add(dev, 0, addr, size, f, shmp);
 118 }
 119
 120 void tee_shm_free(struct tee_shm *shm)
 121 {
 122         if (!shm)
 123                 return;
 124
 125         if (shm->flags & TEE_SHM_SEC_REGISTER)
 126                 tee_get_ops(shm->dev)->shm_unregister(shm->dev, shm);
 127
 128         if (shm->flags & TEE_SHM_REGISTER)
 129                 list_del(&shm->link);
 130
 131         if (shm->flags & TEE_SHM_ALLOC)
 132                 free(shm->addr);
 133
 134         free(shm);
 135 }
 136
 137 bool tee_shm_is_registered(struct tee_shm *shm, struct udevice *dev)
 138 {
 139         struct tee_uclass_priv *priv = dev_get_uclass_priv(dev);
 140         struct tee_shm *s;
 141
 142         list_for_each_entry(s, &priv->list_shm, link)
 143                 if (s == shm)
 144                         return true;
 145
 146         return false;
 147 }
 148
 149 struct udevice *tee_find_device(struct udevice *start,
 150                                 int (*match)(struct tee_version_data *vers,
 151                                              const void *data),
 152                                 const void *data,
 153                                 struct tee_version_data *vers)
 154 {
 155         struct udevice *dev = start;
 156         struct tee_version_data lv;
 157         struct tee_version_data *v = vers ? vers : &lv;
 158
 159         if (!dev)
 160                 uclass_find_first_device(UCLASS_TEE, &dev);
 161         else
 162                 uclass_find_next_device(&dev);
 163
 164         for (; dev; uclass_find_next_device(&dev)) {
 165                 if (device_probe(dev))
 166                         continue;
 167                 tee_get_ops(dev)->get_version(dev, v);
 168                 if (!match || match(v, data))
 169                         return dev;
 170         }
 171
 172         return NULL;
 173 }
 174
 175 static int tee_pre_probe(struct udevice *dev)
 176 {
 177         struct tee_uclass_priv *priv = dev_get_uclass_priv(dev);
 178
 179         INIT_LIST_HEAD(&priv->list_shm);
 180
 181         return 0;
 182 }
 183
 184 static int tee_pre_remove(struct udevice *dev)
 185 {
 186         struct tee_uclass_priv *priv = dev_get_uclass_priv(dev);
 187         struct tee_shm *shm;
 188
 189         /*
 190          * Any remaining shared memory must be unregistered now as U-Boot
 191          * is about to hand over to the next stage and that memory will be
 192          * reused.
 193          */
 194         while (!list_empty(&priv->list_shm)) {
 195                 shm = list_first_entry(&priv->list_shm, struct tee_shm, link);
 196                 debug("%s: freeing leftover shm %p (size %lu, flags %#x)\n",
 197                       __func__, (void *)shm, shm->size, shm->flags);
 198                 tee_shm_free(shm);
 199         }
 200
 201         return 0;
 202 }
 203
 204 UCLASS_DRIVER(tee) = {
 205         .id = UCLASS_TEE,
 206         .name = "tee",
 207         .per_device_auto_alloc_size = sizeof(struct tee_uclass_priv),
 208         .pre_probe = tee_pre_probe,
 209         .pre_remove = tee_pre_remove,
 210 };
 211
 212 void tee_optee_ta_uuid_from_octets(struct tee_optee_ta_uuid *d,
 213                                    const u8 s[TEE_UUID_LEN])
 214 {
 215         d->time_low = ((u32)s[0] << 24) | ((u32)s[1] << 16) |
 216                       ((u32)s[2] << 8) | s[3],
 217         d->time_mid = ((u32)s[4] << 8) | s[5];
 218         d->time_hi_and_version = ((u32)s[6] << 8) | s[7];
 219         memcpy(d->clock_seq_and_node, s + 8, sizeof(d->clock_seq_and_node));
 220 }
 221
 222 void tee_optee_ta_uuid_to_octets(u8 d[TEE_UUID_LEN],
 223                                  const struct tee_optee_ta_uuid *s)
 224 {
 225         d[0] = s->time_low >> 24;
 226         d[1] = s->time_low >> 16;
 227         d[2] = s->time_low >> 8;
 228         d[3] = s->time_low;
 229         d[4] = s->time_mid >> 8;
 230         d[5] = s->time_mid;
 231         d[6] = s->time_hi_and_version >> 8;
 232         d[7] = s->time_hi_and_version;
 233         memcpy(d + 8, s->clock_seq_and_node, sizeof(s->clock_seq_and_node));
 234 }