diff options
Diffstat (limited to 'hw/misc/aspeed_hace.c')
| -rw-r--r-- | hw/misc/aspeed_hace.c | 132 |
1 files changed, 127 insertions, 5 deletions
diff --git a/hw/misc/aspeed_hace.c b/hw/misc/aspeed_hace.c index 59fe5bfca2..0f4059e6df 100644 --- a/hw/misc/aspeed_hace.c +++ b/hw/misc/aspeed_hace.c @@ -65,7 +65,6 @@ #define SG_LIST_ADDR_SIZE 4 #define SG_LIST_ADDR_MASK 0x7FFFFFFF #define SG_LIST_ENTRY_SIZE (SG_LIST_LEN_SIZE + SG_LIST_ADDR_SIZE) -#define ASPEED_HACE_MAX_SG 256 /* max number of entries */ static const struct { uint32_t mask; @@ -95,11 +94,104 @@ static int hash_algo_lookup(uint32_t reg) return -1; } -static void do_hash_operation(AspeedHACEState *s, int algo, bool sg_mode) +/** + * Check whether the request contains padding message. + * + * @param s aspeed hace state object + * @param iov iov of current request + * @param req_len length of the current request + * @param total_msg_len length of all acc_mode requests(excluding padding msg) + * @param pad_offset start offset of padding message + */ +static bool has_padding(AspeedHACEState *s, struct iovec *iov, + hwaddr req_len, uint32_t *total_msg_len, + uint32_t *pad_offset) +{ + *total_msg_len = (uint32_t)(ldq_be_p(iov->iov_base + req_len - 8) / 8); + /* + * SG_LIST_LEN_LAST asserted in the request length doesn't mean it is the + * last request. The last request should contain padding message. + * We check whether message contains padding by + * 1. Get total message length. If the current message contains + * padding, the last 8 bytes are total message length. + * 2. Check whether the total message length is valid. + * If it is valid, the value should less than or equal to + * total_req_len. + * 3. Current request len - padding_size to get padding offset. + * The padding message's first byte should be 0x80 + */ + if (*total_msg_len <= s->total_req_len) { + uint32_t padding_size = s->total_req_len - *total_msg_len; + uint8_t *padding = iov->iov_base; + *pad_offset = req_len - padding_size; + if (padding[*pad_offset] == 0x80) { + return true; + } + } + + return false; +} + +static int reconstruct_iov(AspeedHACEState *s, struct iovec *iov, int id, + uint32_t *pad_offset) +{ + int i, iov_count; + if (*pad_offset != 0) { + s->iov_cache[s->iov_count].iov_base = iov[id].iov_base; + s->iov_cache[s->iov_count].iov_len = *pad_offset; + ++s->iov_count; + } + for (i = 0; i < s->iov_count; i++) { + iov[i].iov_base = s->iov_cache[i].iov_base; + iov[i].iov_len = s->iov_cache[i].iov_len; + } + iov_count = s->iov_count; + s->iov_count = 0; + s->total_req_len = 0; + return iov_count; +} + +/** + * Generate iov for accumulative mode. + * + * @param s aspeed hace state object + * @param iov iov of the current request + * @param id index of the current iov + * @param req_len length of the current request + * + * @return count of iov + */ +static int gen_acc_mode_iov(AspeedHACEState *s, struct iovec *iov, int id, + hwaddr *req_len) +{ + uint32_t pad_offset; + uint32_t total_msg_len; + s->total_req_len += *req_len; + + if (has_padding(s, &iov[id], *req_len, &total_msg_len, &pad_offset)) { + if (s->iov_count) { + return reconstruct_iov(s, iov, id, &pad_offset); + } + + *req_len -= s->total_req_len - total_msg_len; + s->total_req_len = 0; + iov[id].iov_len = *req_len; + } else { + s->iov_cache[s->iov_count].iov_base = iov->iov_base; + s->iov_cache[s->iov_count].iov_len = *req_len; + ++s->iov_count; + } + + return id + 1; +} + +static void do_hash_operation(AspeedHACEState *s, int algo, bool sg_mode, + bool acc_mode) { struct iovec iov[ASPEED_HACE_MAX_SG]; g_autofree uint8_t *digest_buf; size_t digest_len = 0; + int niov = 0; int i; if (sg_mode) { @@ -124,10 +216,16 @@ static void do_hash_operation(AspeedHACEState *s, int algo, bool sg_mode) MEMTXATTRS_UNSPECIFIED, NULL); addr &= SG_LIST_ADDR_MASK; - iov[i].iov_len = len & SG_LIST_LEN_MASK; - plen = iov[i].iov_len; + plen = len & SG_LIST_LEN_MASK; iov[i].iov_base = address_space_map(&s->dram_as, addr, &plen, false, MEMTXATTRS_UNSPECIFIED); + + if (acc_mode) { + niov = gen_acc_mode_iov(s, iov, i, &plen); + + } else { + iov[i].iov_len = plen; + } } } else { hwaddr len = s->regs[R_HASH_SRC_LEN]; @@ -137,6 +235,25 @@ static void do_hash_operation(AspeedHACEState *s, int algo, bool sg_mode) &len, false, MEMTXATTRS_UNSPECIFIED); i = 1; + + if (s->iov_count) { + /* + * In aspeed sdk kernel driver, sg_mode is disabled in hash_final(). + * Thus if we received a request with sg_mode disabled, it is + * required to check whether cache is empty. If no, we should + * combine cached iov and the current iov. + */ + uint32_t total_msg_len; + uint32_t pad_offset; + s->total_req_len += len; + if (has_padding(s, iov, len, &total_msg_len, &pad_offset)) { + niov = reconstruct_iov(s, iov, 0, &pad_offset); + } + } + } + + if (niov) { + i = niov; } if (qcrypto_hash_bytesv(algo, iov, i, &digest_buf, &digest_len, NULL) < 0) { @@ -238,7 +355,8 @@ static void aspeed_hace_write(void *opaque, hwaddr addr, uint64_t data, __func__, data & ahc->hash_mask); break; } - do_hash_operation(s, algo, data & HASH_SG_EN); + do_hash_operation(s, algo, data & HASH_SG_EN, + ((data & HASH_HMAC_MASK) == HASH_DIGEST_ACCUM)); if (data & HASH_IRQ_EN) { qemu_irq_raise(s->irq); @@ -271,6 +389,8 @@ static void aspeed_hace_reset(DeviceState *dev) struct AspeedHACEState *s = ASPEED_HACE(dev); memset(s->regs, 0, sizeof(s->regs)); + s->iov_count = 0; + s->total_req_len = 0; } static void aspeed_hace_realize(DeviceState *dev, Error **errp) @@ -306,6 +426,8 @@ static const VMStateDescription vmstate_aspeed_hace = { .minimum_version_id = 1, .fields = (VMStateField[]) { VMSTATE_UINT32_ARRAY(regs, AspeedHACEState, ASPEED_HACE_NR_REGS), + VMSTATE_UINT32(total_req_len, AspeedHACEState), + VMSTATE_UINT32(iov_count, AspeedHACEState), VMSTATE_END_OF_LIST(), } }; |