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164 lines
3.8 KiB
164 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* sun8i-ce-prng.c - hardware cryptographic offloader for |
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* Allwinner H3/A64/H5/H2+/H6/R40 SoC |
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* |
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* Copyright (C) 2015-2020 Corentin Labbe <[email protected]> |
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* |
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* This file handle the PRNG |
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* |
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* You could find a link for the datasheet in Documentation/arm/sunxi.rst |
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*/ |
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#include "sun8i-ce.h" |
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#include <linux/dma-mapping.h> |
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#include <linux/pm_runtime.h> |
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#include <crypto/internal/rng.h> |
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int sun8i_ce_prng_init(struct crypto_tfm *tfm) |
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{ |
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struct sun8i_ce_rng_tfm_ctx *ctx = crypto_tfm_ctx(tfm); |
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memset(ctx, 0, sizeof(struct sun8i_ce_rng_tfm_ctx)); |
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return 0; |
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} |
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void sun8i_ce_prng_exit(struct crypto_tfm *tfm) |
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{ |
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struct sun8i_ce_rng_tfm_ctx *ctx = crypto_tfm_ctx(tfm); |
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memzero_explicit(ctx->seed, ctx->slen); |
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kfree(ctx->seed); |
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ctx->seed = NULL; |
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ctx->slen = 0; |
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} |
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int sun8i_ce_prng_seed(struct crypto_rng *tfm, const u8 *seed, |
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unsigned int slen) |
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{ |
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struct sun8i_ce_rng_tfm_ctx *ctx = crypto_rng_ctx(tfm); |
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if (ctx->seed && ctx->slen != slen) { |
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memzero_explicit(ctx->seed, ctx->slen); |
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kfree(ctx->seed); |
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ctx->slen = 0; |
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ctx->seed = NULL; |
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} |
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if (!ctx->seed) |
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ctx->seed = kmalloc(slen, GFP_KERNEL | GFP_DMA); |
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if (!ctx->seed) |
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return -ENOMEM; |
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memcpy(ctx->seed, seed, slen); |
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ctx->slen = slen; |
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return 0; |
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} |
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int sun8i_ce_prng_generate(struct crypto_rng *tfm, const u8 *src, |
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unsigned int slen, u8 *dst, unsigned int dlen) |
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{ |
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struct sun8i_ce_rng_tfm_ctx *ctx = crypto_rng_ctx(tfm); |
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struct rng_alg *alg = crypto_rng_alg(tfm); |
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struct sun8i_ce_alg_template *algt; |
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struct sun8i_ce_dev *ce; |
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dma_addr_t dma_iv, dma_dst; |
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int err = 0; |
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int flow = 3; |
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unsigned int todo; |
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struct sun8i_ce_flow *chan; |
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struct ce_task *cet; |
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u32 common, sym; |
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void *d; |
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algt = container_of(alg, struct sun8i_ce_alg_template, alg.rng); |
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ce = algt->ce; |
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if (ctx->slen == 0) { |
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dev_err(ce->dev, "not seeded\n"); |
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return -EINVAL; |
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} |
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/* we want dlen + seedsize rounded up to a multiple of PRNG_DATA_SIZE */ |
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todo = dlen + ctx->slen + PRNG_DATA_SIZE * 2; |
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todo -= todo % PRNG_DATA_SIZE; |
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d = kzalloc(todo, GFP_KERNEL | GFP_DMA); |
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if (!d) { |
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err = -ENOMEM; |
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goto err_mem; |
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} |
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dev_dbg(ce->dev, "%s PRNG slen=%u dlen=%u todo=%u multi=%u\n", __func__, |
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slen, dlen, todo, todo / PRNG_DATA_SIZE); |
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#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG |
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algt->stat_req++; |
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algt->stat_bytes += todo; |
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#endif |
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dma_iv = dma_map_single(ce->dev, ctx->seed, ctx->slen, DMA_TO_DEVICE); |
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if (dma_mapping_error(ce->dev, dma_iv)) { |
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dev_err(ce->dev, "Cannot DMA MAP IV\n"); |
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goto err_iv; |
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} |
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dma_dst = dma_map_single(ce->dev, d, todo, DMA_FROM_DEVICE); |
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if (dma_mapping_error(ce->dev, dma_dst)) { |
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dev_err(ce->dev, "Cannot DMA MAP DST\n"); |
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err = -EFAULT; |
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goto err_dst; |
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} |
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err = pm_runtime_get_sync(ce->dev); |
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if (err < 0) { |
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pm_runtime_put_noidle(ce->dev); |
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goto err_pm; |
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} |
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mutex_lock(&ce->rnglock); |
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chan = &ce->chanlist[flow]; |
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cet = &chan->tl[0]; |
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memset(cet, 0, sizeof(struct ce_task)); |
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cet->t_id = cpu_to_le32(flow); |
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common = ce->variant->prng | CE_COMM_INT; |
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cet->t_common_ctl = cpu_to_le32(common); |
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/* recent CE (H6) need length in bytes, in word otherwise */ |
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if (ce->variant->prng_t_dlen_in_bytes) |
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cet->t_dlen = cpu_to_le32(todo); |
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else |
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cet->t_dlen = cpu_to_le32(todo / 4); |
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sym = PRNG_LD; |
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cet->t_sym_ctl = cpu_to_le32(sym); |
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cet->t_asym_ctl = 0; |
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cet->t_key = cpu_to_le32(dma_iv); |
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cet->t_iv = cpu_to_le32(dma_iv); |
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cet->t_dst[0].addr = cpu_to_le32(dma_dst); |
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cet->t_dst[0].len = cpu_to_le32(todo / 4); |
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ce->chanlist[flow].timeout = 2000; |
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err = sun8i_ce_run_task(ce, 3, "PRNG"); |
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mutex_unlock(&ce->rnglock); |
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pm_runtime_put(ce->dev); |
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err_pm: |
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dma_unmap_single(ce->dev, dma_dst, todo, DMA_FROM_DEVICE); |
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err_dst: |
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dma_unmap_single(ce->dev, dma_iv, ctx->slen, DMA_TO_DEVICE); |
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if (!err) { |
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memcpy(dst, d, dlen); |
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memcpy(ctx->seed, d + dlen, ctx->slen); |
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} |
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memzero_explicit(d, todo); |
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err_iv: |
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kfree(d); |
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err_mem: |
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return err; |
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}
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