drivers/crypto/inside-secure/safexcel_ring.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2017 Marvell
   4  *
   5  * Antoine Tenart <antoine.tenart@free-electrons.com>
   6  */
   7
   8 #include <linux/dma-mapping.h>
   9 #include <linux/spinlock.h>
  10
  11 #include "safexcel.h"
  12
  13 int safexcel_init_ring_descriptors(struct safexcel_crypto_priv *priv,
  14                                    struct safexcel_desc_ring *cdr,
  15                                    struct safexcel_desc_ring *rdr)
  16 {
  17         cdr->offset = sizeof(u32) * priv->config.cd_offset;
  18         cdr->base = dmam_alloc_coherent(priv->dev,
  19                                         cdr->offset * EIP197_DEFAULT_RING_SIZE,
  20                                         &cdr->base_dma, GFP_KERNEL);
  21         if (!cdr->base)
  22                 return -ENOMEM;
  23         cdr->write = cdr->base;
  24         cdr->base_end = cdr->base + cdr->offset * (EIP197_DEFAULT_RING_SIZE - 1);
  25         cdr->read = cdr->base;
  26
  27         rdr->offset = sizeof(u32) * priv->config.rd_offset;
  28         rdr->base = dmam_alloc_coherent(priv->dev,
  29                                         rdr->offset * EIP197_DEFAULT_RING_SIZE,
  30                                         &rdr->base_dma, GFP_KERNEL);
  31         if (!rdr->base)
  32                 return -ENOMEM;
  33         rdr->write = rdr->base;
  34         rdr->base_end = rdr->base + rdr->offset  * (EIP197_DEFAULT_RING_SIZE - 1);
  35         rdr->read = rdr->base;
  36
  37         return 0;
  38 }
  39
  40 inline int safexcel_select_ring(struct safexcel_crypto_priv *priv)
  41 {
  42         return (atomic_inc_return(&priv->ring_used) % priv->config.rings);
  43 }
  44
  45 static void *safexcel_ring_next_wptr(struct safexcel_crypto_priv *priv,
  46                                      struct safexcel_desc_ring *ring)
  47 {
  48         void *ptr = ring->write;
  49
  50         if ((ring->write == ring->read - ring->offset) ||
  51             (ring->read == ring->base && ring->write == ring->base_end))
  52                 return ERR_PTR(-ENOMEM);
  53
  54         if (ring->write == ring->base_end)
  55                 ring->write = ring->base;
  56         else
  57                 ring->write += ring->offset;
  58
  59         return ptr;
  60 }
  61
  62 void *safexcel_ring_next_rptr(struct safexcel_crypto_priv *priv,
  63                               struct safexcel_desc_ring *ring)
  64 {
  65         void *ptr = ring->read;
  66
  67         if (ring->write == ring->read)
  68                 return ERR_PTR(-ENOENT);
  69
  70         if (ring->read == ring->base_end)
  71                 ring->read = ring->base;
  72         else
  73                 ring->read += ring->offset;
  74
  75         return ptr;
  76 }
  77
  78 inline void *safexcel_ring_curr_rptr(struct safexcel_crypto_priv *priv,
  79                                      int ring)
  80 {
  81         struct safexcel_desc_ring *rdr = &priv->ring[ring].rdr;
  82
  83         return rdr->read;
  84 }
  85
  86 inline int safexcel_ring_first_rdr_index(struct safexcel_crypto_priv *priv,
  87                                          int ring)
  88 {
  89         struct safexcel_desc_ring *rdr = &priv->ring[ring].rdr;
  90
  91         return (rdr->read - rdr->base) / rdr->offset;
  92 }
  93
  94 inline int safexcel_ring_rdr_rdesc_index(struct safexcel_crypto_priv *priv,
  95                                          int ring,
  96                                          struct safexcel_result_desc *rdesc)
  97 {
  98         struct safexcel_desc_ring *rdr = &priv->ring[ring].rdr;
  99
 100         return ((void *)rdesc - rdr->base) / rdr->offset;
 101 }
 102
 103 void safexcel_ring_rollback_wptr(struct safexcel_crypto_priv *priv,
 104                                  struct safexcel_desc_ring *ring)
 105 {
 106         if (ring->write == ring->read)
 107                 return;
 108
 109         if (ring->write == ring->base)
 110                 ring->write = ring->base_end;
 111         else
 112                 ring->write -= ring->offset;
 113 }
 114
 115 struct safexcel_command_desc *safexcel_add_cdesc(struct safexcel_crypto_priv *priv,
 116                                                  int ring_id,
 117                                                  bool first, bool last,
 118                                                  dma_addr_t data, u32 data_len,
 119                                                  u32 full_data_len,
 120                                                  dma_addr_t context) {
 121         struct safexcel_command_desc *cdesc;
 122         int i;
 123
 124         cdesc = safexcel_ring_next_wptr(priv, &priv->ring[ring_id].cdr);
 125         if (IS_ERR(cdesc))
 126                 return cdesc;
 127
 128         memset(cdesc, 0, sizeof(struct safexcel_command_desc));
 129
 130         cdesc->first_seg = first;
 131         cdesc->last_seg = last;
 132         cdesc->particle_size = data_len;
 133         cdesc->data_lo = lower_32_bits(data);
 134         cdesc->data_hi = upper_32_bits(data);
 135
 136         if (first && context) {
 137                 struct safexcel_token *token =
 138                         (struct safexcel_token *)cdesc->control_data.token;
 139
 140                 cdesc->control_data.packet_length = full_data_len;
 141                 cdesc->control_data.options = EIP197_OPTION_MAGIC_VALUE |
 142                                               EIP197_OPTION_64BIT_CTX |
 143                                               EIP197_OPTION_CTX_CTRL_IN_CMD;
 144                 cdesc->control_data.context_lo =
 145                         (lower_32_bits(context) & GENMASK(31, 2)) >> 2;
 146                 cdesc->control_data.context_hi = upper_32_bits(context);
 147
 148                 /* TODO: large xform HMAC with SHA-384/512 uses refresh = 3 */
 149                 cdesc->control_data.refresh = 2;
 150
 151                 for (i = 0; i < EIP197_MAX_TOKENS; i++)
 152                         eip197_noop_token(&token[i]);
 153         }
 154
 155         return cdesc;
 156 }
 157
 158 struct safexcel_result_desc *safexcel_add_rdesc(struct safexcel_crypto_priv *priv,
 159                                                 int ring_id,
 160                                                 bool first, bool last,
 161                                                 dma_addr_t data, u32 len)
 162 {
 163         struct safexcel_result_desc *rdesc;
 164
 165         rdesc = safexcel_ring_next_wptr(priv, &priv->ring[ring_id].rdr);
 166         if (IS_ERR(rdesc))
 167                 return rdesc;
 168
 169         memset(rdesc, 0, sizeof(struct safexcel_result_desc));
 170
 171         rdesc->first_seg = first;
 172         rdesc->last_seg = last;
 173         rdesc->particle_size = len;
 174         rdesc->data_lo = lower_32_bits(data);
 175         rdesc->data_hi = upper_32_bits(data);
 176
 177         return rdesc;
 178 }