safexcel_ring.c
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/*
* Copyright (C) 2017 Marvell
*
* Antoine Tenart <antoine.tenart@free-electrons.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/dma-mapping.h>
#include <linux/spinlock.h>
#include "safexcel.h"
int safexcel_init_ring_descriptors(struct safexcel_crypto_priv *priv,
struct safexcel_ring *cdr,
struct safexcel_ring *rdr)
{
cdr->offset = sizeof(u32) * priv->config.cd_offset;
cdr->base = dmam_alloc_coherent(priv->dev,
cdr->offset * EIP197_DEFAULT_RING_SIZE,
&cdr->base_dma, GFP_KERNEL);
if (!cdr->base)
return -ENOMEM;
cdr->write = cdr->base;
cdr->base_end = cdr->base + cdr->offset * EIP197_DEFAULT_RING_SIZE;
cdr->read = cdr->base;
rdr->offset = sizeof(u32) * priv->config.rd_offset;
rdr->base = dmam_alloc_coherent(priv->dev,
rdr->offset * EIP197_DEFAULT_RING_SIZE,
&rdr->base_dma, GFP_KERNEL);
if (!rdr->base)
return -ENOMEM;
rdr->write = rdr->base;
rdr->base_end = rdr->base + rdr->offset * EIP197_DEFAULT_RING_SIZE;
rdr->read = rdr->base;
return 0;
}
inline int safexcel_select_ring(struct safexcel_crypto_priv *priv)
{
return (atomic_inc_return(&priv->ring_used) % priv->config.rings);
}
static void *safexcel_ring_next_wptr(struct safexcel_crypto_priv *priv,
struct safexcel_ring *ring)
{
void *ptr = ring->write;
if (ring->nr == EIP197_DEFAULT_RING_SIZE - 1)
return ERR_PTR(-ENOMEM);
ring->write += ring->offset;
if (ring->write == ring->base_end)
ring->write = ring->base;
ring->nr++;
return ptr;
}
void *safexcel_ring_next_rptr(struct safexcel_crypto_priv *priv,
struct safexcel_ring *ring)
{
void *ptr = ring->read;
if (!ring->nr)
return ERR_PTR(-ENOENT);
ring->read += ring->offset;
if (ring->read == ring->base_end)
ring->read = ring->base;
ring->nr--;
return ptr;
}
void safexcel_ring_rollback_wptr(struct safexcel_crypto_priv *priv,
struct safexcel_ring *ring)
{
if (!ring->nr)
return;
if (ring->write == ring->base)
ring->write = ring->base_end - ring->offset;
else
ring->write -= ring->offset;
ring->nr--;
}
struct safexcel_command_desc *safexcel_add_cdesc(struct safexcel_crypto_priv *priv,
int ring_id,
bool first, bool last,
dma_addr_t data, u32 data_len,
u32 full_data_len,
dma_addr_t context) {
struct safexcel_command_desc *cdesc;
int i;
cdesc = safexcel_ring_next_wptr(priv, &priv->ring[ring_id].cdr);
if (IS_ERR(cdesc))
return cdesc;
memset(cdesc, 0, sizeof(struct safexcel_command_desc));
cdesc->first_seg = first;
cdesc->last_seg = last;
cdesc->particle_size = data_len;
cdesc->data_lo = lower_32_bits(data);
cdesc->data_hi = upper_32_bits(data);
if (first && context) {
struct safexcel_token *token =
(struct safexcel_token *)cdesc->control_data.token;
cdesc->control_data.packet_length = full_data_len;
cdesc->control_data.options = EIP197_OPTION_MAGIC_VALUE |
EIP197_OPTION_64BIT_CTX |
EIP197_OPTION_CTX_CTRL_IN_CMD;
cdesc->control_data.context_lo =
(lower_32_bits(context) & GENMASK(31, 2)) >> 2;
cdesc->control_data.context_hi = upper_32_bits(context);
/* TODO: large xform HMAC with SHA-384/512 uses refresh = 3 */
cdesc->control_data.refresh = 2;
for (i = 0; i < EIP197_MAX_TOKENS; i++)
eip197_noop_token(&token[i]);
}
return cdesc;
}
struct safexcel_result_desc *safexcel_add_rdesc(struct safexcel_crypto_priv *priv,
int ring_id,
bool first, bool last,
dma_addr_t data, u32 len)
{
struct safexcel_result_desc *rdesc;
rdesc = safexcel_ring_next_wptr(priv, &priv->ring[ring_id].rdr);
if (IS_ERR(rdesc))
return rdesc;
memset(rdesc, 0, sizeof(struct safexcel_result_desc));
rdesc->first_seg = first;
rdesc->last_seg = last;
rdesc->particle_size = len;
rdesc->data_lo = lower_32_bits(data);
rdesc->data_hi = upper_32_bits(data);
return rdesc;
}