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qemu/hw/misc/aspeed_hace.c
Joel Stanley 0dbf6dc576 aspeed/hace: Accumulative mode supported 
While the HMAC mode is not modelled, the accumulative mode is.

Accumulative mode is enabled by setting one of the bits in the HMAC
engine command mode part of the register, so fix the unimplemented check
to only look at the upper of the two bits.

Fixes: 5cd7d8564a ("aspeed/hace: Support AST2600 HACE")
Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20220627100816.125956-1-joel@jms.id.au>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
2022-06-30 09:21:13 +02:00

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/*
* ASPEED Hash and Crypto Engine
*
* Copyright (C) 2021 IBM Corp.
*
* Joel Stanley <joel@jms.id.au>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qemu/error-report.h"
#include "hw/misc/aspeed_hace.h"
#include "qapi/error.h"
#include "migration/vmstate.h"
#include "crypto/hash.h"
#include "hw/qdev-properties.h"
#include "hw/irq.h"
#define R_CRYPT_CMD (0x10 / 4)
#define R_STATUS (0x1c / 4)
#define HASH_IRQ BIT(9)
#define CRYPT_IRQ BIT(12)
#define TAG_IRQ BIT(15)
#define R_HASH_SRC (0x20 / 4)
#define R_HASH_DEST (0x24 / 4)
#define R_HASH_KEY_BUFF (0x28 / 4)
#define R_HASH_SRC_LEN (0x2c / 4)
#define R_HASH_CMD (0x30 / 4)
/* Hash algorithm selection */
#define HASH_ALGO_MASK (BIT(4) | BIT(5) | BIT(6))
#define HASH_ALGO_MD5 0
#define HASH_ALGO_SHA1 BIT(5)
#define HASH_ALGO_SHA224 BIT(6)
#define HASH_ALGO_SHA256 (BIT(4) | BIT(6))
#define HASH_ALGO_SHA512_SERIES (BIT(5) | BIT(6))
/* SHA512 algorithm selection */
#define SHA512_HASH_ALGO_MASK (BIT(10) | BIT(11) | BIT(12))
#define HASH_ALGO_SHA512_SHA512 0
#define HASH_ALGO_SHA512_SHA384 BIT(10)
#define HASH_ALGO_SHA512_SHA256 BIT(11)
#define HASH_ALGO_SHA512_SHA224 (BIT(10) | BIT(11))
/* HMAC modes */
#define HASH_HMAC_MASK (BIT(7) | BIT(8))
#define HASH_DIGEST 0
#define HASH_DIGEST_HMAC BIT(7)
#define HASH_DIGEST_ACCUM BIT(8)
#define HASH_HMAC_KEY (BIT(7) | BIT(8))
/* Cascaded operation modes */
#define HASH_ONLY 0
#define HASH_ONLY2 BIT(0)
#define HASH_CRYPT_THEN_HASH BIT(1)
#define HASH_HASH_THEN_CRYPT (BIT(0) | BIT(1))
/* Other cmd bits */
#define HASH_IRQ_EN BIT(9)
#define HASH_SG_EN BIT(18)
/* Scatter-gather data list */
#define SG_LIST_LEN_SIZE 4
#define SG_LIST_LEN_MASK 0x0FFFFFFF
#define SG_LIST_LEN_LAST BIT(31)
#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)
static const struct {
uint32_t mask;
QCryptoHashAlgorithm algo;
} hash_algo_map[] = {
{ HASH_ALGO_MD5, QCRYPTO_HASH_ALG_MD5 },
{ HASH_ALGO_SHA1, QCRYPTO_HASH_ALG_SHA1 },
{ HASH_ALGO_SHA224, QCRYPTO_HASH_ALG_SHA224 },
{ HASH_ALGO_SHA256, QCRYPTO_HASH_ALG_SHA256 },
{ HASH_ALGO_SHA512_SERIES | HASH_ALGO_SHA512_SHA512, QCRYPTO_HASH_ALG_SHA512 },
{ HASH_ALGO_SHA512_SERIES | HASH_ALGO_SHA512_SHA384, QCRYPTO_HASH_ALG_SHA384 },
{ HASH_ALGO_SHA512_SERIES | HASH_ALGO_SHA512_SHA256, QCRYPTO_HASH_ALG_SHA256 },
};
static int hash_algo_lookup(uint32_t reg)
{
int i;
reg &= HASH_ALGO_MASK | SHA512_HASH_ALGO_MASK;
for (i = 0; i < ARRAY_SIZE(hash_algo_map); i++) {
if (reg == hash_algo_map[i].mask) {
return hash_algo_map[i].algo;
}
}
return -1;
}
/**
* 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) {
uint32_t len = 0;
for (i = 0; !(len & SG_LIST_LEN_LAST); i++) {
uint32_t addr, src;
hwaddr plen;
if (i == ASPEED_HACE_MAX_SG) {
qemu_log_mask(LOG_GUEST_ERROR,
"aspeed_hace: guest failed to set end of sg list marker\n");
break;
}
src = s->regs[R_HASH_SRC] + (i * SG_LIST_ENTRY_SIZE);
len = address_space_ldl_le(&s->dram_as, src,
MEMTXATTRS_UNSPECIFIED, NULL);
addr = address_space_ldl_le(&s->dram_as, src + SG_LIST_LEN_SIZE,
MEMTXATTRS_UNSPECIFIED, NULL);
addr &= SG_LIST_ADDR_MASK;
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];
iov[0].iov_len = len;
iov[0].iov_base = address_space_map(&s->dram_as, s->regs[R_HASH_SRC],
&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) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: qcrypto failed\n", __func__);
return;
}
if (address_space_write(&s->dram_as, s->regs[R_HASH_DEST],
MEMTXATTRS_UNSPECIFIED,
digest_buf, digest_len)) {
qemu_log_mask(LOG_GUEST_ERROR,
"aspeed_hace: address space write failed\n");
}
for (; i > 0; i--) {
address_space_unmap(&s->dram_as, iov[i - 1].iov_base,
iov[i - 1].iov_len, false,
iov[i - 1].iov_len);
}
/*
* Set status bits to indicate completion. Testing shows hardware sets
* these irrespective of HASH_IRQ_EN.
*/
s->regs[R_STATUS] |= HASH_IRQ;
}
static uint64_t aspeed_hace_read(void *opaque, hwaddr addr, unsigned int size)
{
AspeedHACEState *s = ASPEED_HACE(opaque);
addr >>= 2;
if (addr >= ASPEED_HACE_NR_REGS) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Out-of-bounds read at offset 0x%" HWADDR_PRIx "\n",
__func__, addr << 2);
return 0;
}
return s->regs[addr];
}
static void aspeed_hace_write(void *opaque, hwaddr addr, uint64_t data,
unsigned int size)
{
AspeedHACEState *s = ASPEED_HACE(opaque);
AspeedHACEClass *ahc = ASPEED_HACE_GET_CLASS(s);
addr >>= 2;
if (addr >= ASPEED_HACE_NR_REGS) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Out-of-bounds write at offset 0x%" HWADDR_PRIx "\n",
__func__, addr << 2);
return;
}
switch (addr) {
case R_STATUS:
if (data & HASH_IRQ) {
data &= ~HASH_IRQ;
if (s->regs[addr] & HASH_IRQ) {
qemu_irq_lower(s->irq);
}
}
break;
case R_HASH_SRC:
data &= ahc->src_mask;
break;
case R_HASH_DEST:
data &= ahc->dest_mask;
break;
case R_HASH_KEY_BUFF:
data &= ahc->key_mask;
break;
case R_HASH_SRC_LEN:
data &= 0x0FFFFFFF;
break;
case R_HASH_CMD: {
int algo;
data &= ahc->hash_mask;
if ((data & HASH_DIGEST_HMAC)) {
qemu_log_mask(LOG_UNIMP,
"%s: HMAC mode not implemented\n",
__func__);
}
if (data & BIT(1)) {
qemu_log_mask(LOG_UNIMP,
"%s: Cascaded mode not implemented\n",
__func__);
}
algo = hash_algo_lookup(data);
if (algo < 0) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Invalid hash algorithm selection 0x%"PRIx64"\n",
__func__, data & ahc->hash_mask);
break;
}
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);
}
break;
}
case R_CRYPT_CMD:
qemu_log_mask(LOG_UNIMP, "%s: Crypt commands not implemented\n",
__func__);
break;
default:
break;
}
s->regs[addr] = data;
}
static const MemoryRegionOps aspeed_hace_ops = {
.read = aspeed_hace_read,
.write = aspeed_hace_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 4,
},
};
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)
{
AspeedHACEState *s = ASPEED_HACE(dev);
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
sysbus_init_irq(sbd, &s->irq);
memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_hace_ops, s,
TYPE_ASPEED_HACE, 0x1000);
if (!s->dram_mr) {
error_setg(errp, TYPE_ASPEED_HACE ": 'dram' link not set");
return;
}
address_space_init(&s->dram_as, s->dram_mr, "dram");
sysbus_init_mmio(sbd, &s->iomem);
}
static Property aspeed_hace_properties[] = {
DEFINE_PROP_LINK("dram", AspeedHACEState, dram_mr,
TYPE_MEMORY_REGION, MemoryRegion *),
DEFINE_PROP_END_OF_LIST(),
};
static const VMStateDescription vmstate_aspeed_hace = {
.name = TYPE_ASPEED_HACE,
.version_id = 1,
.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(),
}
};
static void aspeed_hace_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = aspeed_hace_realize;
dc->reset = aspeed_hace_reset;
device_class_set_props(dc, aspeed_hace_properties);
dc->vmsd = &vmstate_aspeed_hace;
}
static const TypeInfo aspeed_hace_info = {
.name = TYPE_ASPEED_HACE,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(AspeedHACEState),
.class_init = aspeed_hace_class_init,
.class_size = sizeof(AspeedHACEClass)
};
static void aspeed_ast2400_hace_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
AspeedHACEClass *ahc = ASPEED_HACE_CLASS(klass);
dc->desc = "AST2400 Hash and Crypto Engine";
ahc->src_mask = 0x0FFFFFFF;
ahc->dest_mask = 0x0FFFFFF8;
ahc->key_mask = 0x0FFFFFC0;
ahc->hash_mask = 0x000003ff; /* No SG or SHA512 modes */
}
static const TypeInfo aspeed_ast2400_hace_info = {
.name = TYPE_ASPEED_AST2400_HACE,
.parent = TYPE_ASPEED_HACE,
.class_init = aspeed_ast2400_hace_class_init,
};
static void aspeed_ast2500_hace_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
AspeedHACEClass *ahc = ASPEED_HACE_CLASS(klass);
dc->desc = "AST2500 Hash and Crypto Engine";
ahc->src_mask = 0x3fffffff;
ahc->dest_mask = 0x3ffffff8;
ahc->key_mask = 0x3FFFFFC0;
ahc->hash_mask = 0x000003ff; /* No SG or SHA512 modes */
}
static const TypeInfo aspeed_ast2500_hace_info = {
.name = TYPE_ASPEED_AST2500_HACE,
.parent = TYPE_ASPEED_HACE,
.class_init = aspeed_ast2500_hace_class_init,
};
static void aspeed_ast2600_hace_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
AspeedHACEClass *ahc = ASPEED_HACE_CLASS(klass);
dc->desc = "AST2600 Hash and Crypto Engine";
ahc->src_mask = 0x7FFFFFFF;
ahc->dest_mask = 0x7FFFFFF8;
ahc->key_mask = 0x7FFFFFF8;
ahc->hash_mask = 0x00147FFF;
}
static const TypeInfo aspeed_ast2600_hace_info = {
.name = TYPE_ASPEED_AST2600_HACE,
.parent = TYPE_ASPEED_HACE,
.class_init = aspeed_ast2600_hace_class_init,
};
static void aspeed_ast1030_hace_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
AspeedHACEClass *ahc = ASPEED_HACE_CLASS(klass);
dc->desc = "AST1030 Hash and Crypto Engine";
ahc->src_mask = 0x7FFFFFFF;
ahc->dest_mask = 0x7FFFFFF8;
ahc->key_mask = 0x7FFFFFF8;
ahc->hash_mask = 0x00147FFF;
}
static const TypeInfo aspeed_ast1030_hace_info = {
.name = TYPE_ASPEED_AST1030_HACE,
.parent = TYPE_ASPEED_HACE,
.class_init = aspeed_ast1030_hace_class_init,
};
static void aspeed_hace_register_types(void)
{
type_register_static(&aspeed_ast2400_hace_info);
type_register_static(&aspeed_ast2500_hace_info);
type_register_static(&aspeed_ast2600_hace_info);
type_register_static(&aspeed_ast1030_hace_info);
type_register_static(&aspeed_hace_info);
}
type_init(aspeed_hace_register_types);
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