* [PATCH v4 3/4] crypto: sahara - replace tasklets with kthread
2014-12-01 12:26 [PATCH v4 0/4] crypto: sahara - SHA support Steffen Trumtrar
2014-12-01 12:26 ` [PATCH v4 1/4] crypto: sahara - fix spinlock initialization Steffen Trumtrar
2014-12-01 12:26 ` [PATCH v4 2/4] crypto: sahara - add support for i.MX53 Steffen Trumtrar
@ 2014-12-01 12:26 ` Steffen Trumtrar
2014-12-01 12:26 ` [PATCH v4 4/4] crypto: sahara - add support for SHA1/256 Steffen Trumtrar
2014-12-03 14:34 ` [PATCH v4 0/4] crypto: sahara - SHA support Herbert Xu
4 siblings, 0 replies; 7+ messages in thread
From: Steffen Trumtrar @ 2014-12-01 12:26 UTC (permalink / raw)
To: Herbert Xu, David S. Miller; +Cc: linux-crypto, kernel, Steffen Trumtrar
In preparation for SHA support, replace the tasklets with a kthread that
manages one crypto_queue for the core.
As the Sahara can only process one AES or SHA request at a time, we make
sure that the queue serializes all requests from userspace. Instead of a
watchdog timer we now use a completion mechanism in the queue manager
thread.
This makes the control flow more obvious and guarantees, that only one
request is dequeued until the completion is completed.
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
---
drivers/crypto/sahara.c | 152 +++++++++++++++++++++---------------------------
1 file changed, 66 insertions(+), 86 deletions(-)
diff --git a/drivers/crypto/sahara.c b/drivers/crypto/sahara.c
index 55c0d2bea426..04d3b4309e4c 100644
--- a/drivers/crypto/sahara.c
+++ b/drivers/crypto/sahara.c
@@ -22,7 +22,9 @@
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/kernel.h>
+#include <linux/kthread.h>
#include <linux/module.h>
+#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
@@ -38,7 +40,6 @@
#define FLAGS_ENCRYPT BIT(0)
#define FLAGS_CBC BIT(1)
#define FLAGS_NEW_KEY BIT(3)
-#define FLAGS_BUSY 4
#define SAHARA_HDR_BASE 0x00800000
#define SAHARA_HDR_SKHA_ALG_AES 0
@@ -119,7 +120,6 @@ struct sahara_hw_link {
};
struct sahara_ctx {
- struct sahara_dev *dev;
unsigned long flags;
int keylen;
u8 key[AES_KEYSIZE_128];
@@ -136,15 +136,15 @@ struct sahara_dev {
void __iomem *regs_base;
struct clk *clk_ipg;
struct clk *clk_ahb;
+ struct mutex queue_mutex;
+ struct task_struct *kthread;
+ struct completion dma_completion;
struct sahara_ctx *ctx;
spinlock_t lock;
struct crypto_queue queue;
unsigned long flags;
- struct tasklet_struct done_task;
- struct tasklet_struct queue_task;
-
struct sahara_hw_desc *hw_desc[SAHARA_MAX_HW_DESC];
dma_addr_t hw_phys_desc[SAHARA_MAX_HW_DESC];
@@ -157,7 +157,6 @@ struct sahara_dev {
struct sahara_hw_link *hw_link[SAHARA_MAX_HW_LINK];
dma_addr_t hw_phys_link[SAHARA_MAX_HW_LINK];
- struct ablkcipher_request *req;
size_t total;
struct scatterlist *in_sg;
unsigned int nb_in_sg;
@@ -165,7 +164,6 @@ struct sahara_dev {
unsigned int nb_out_sg;
u32 error;
- struct timer_list watchdog;
};
static struct sahara_dev *dev_ptr;
@@ -404,34 +402,6 @@ static void sahara_dump_links(struct sahara_dev *dev)
dev_dbg(dev->device, "\n");
}
-static void sahara_aes_done_task(unsigned long data)
-{
- struct sahara_dev *dev = (struct sahara_dev *)data;
-
- dma_unmap_sg(dev->device, dev->out_sg, dev->nb_out_sg,
- DMA_TO_DEVICE);
- dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg,
- DMA_FROM_DEVICE);
-
- spin_lock(&dev->lock);
- clear_bit(FLAGS_BUSY, &dev->flags);
- spin_unlock(&dev->lock);
-
- dev->req->base.complete(&dev->req->base, dev->error);
-}
-
-static void sahara_watchdog(unsigned long data)
-{
- struct sahara_dev *dev = (struct sahara_dev *)data;
- unsigned int err = sahara_read(dev, SAHARA_REG_ERRSTATUS);
- unsigned int stat = sahara_read(dev, SAHARA_REG_STATUS);
-
- sahara_decode_status(dev, stat);
- sahara_decode_error(dev, err);
- dev->error = -ETIMEDOUT;
- sahara_aes_done_task(data);
-}
-
static int sahara_hw_descriptor_create(struct sahara_dev *dev)
{
struct sahara_ctx *ctx = dev->ctx;
@@ -515,9 +485,6 @@ static int sahara_hw_descriptor_create(struct sahara_dev *dev)
sahara_dump_descriptors(dev);
sahara_dump_links(dev);
- /* Start processing descriptor chain. */
- mod_timer(&dev->watchdog,
- jiffies + msecs_to_jiffies(SAHARA_TIMEOUT_MS));
sahara_write(dev, dev->hw_phys_desc[0], SAHARA_REG_DAR);
return 0;
@@ -532,37 +499,19 @@ unmap_in:
return -EINVAL;
}
-static void sahara_aes_queue_task(unsigned long data)
+static int sahara_aes_process(struct ablkcipher_request *req)
{
- struct sahara_dev *dev = (struct sahara_dev *)data;
- struct crypto_async_request *async_req, *backlog;
+ struct sahara_dev *dev = dev_ptr;
struct sahara_ctx *ctx;
struct sahara_aes_reqctx *rctx;
- struct ablkcipher_request *req;
int ret;
- spin_lock(&dev->lock);
- backlog = crypto_get_backlog(&dev->queue);
- async_req = crypto_dequeue_request(&dev->queue);
- if (!async_req)
- clear_bit(FLAGS_BUSY, &dev->flags);
- spin_unlock(&dev->lock);
-
- if (!async_req)
- return;
-
- if (backlog)
- backlog->complete(backlog, -EINPROGRESS);
-
- req = ablkcipher_request_cast(async_req);
-
/* Request is ready to be dispatched by the device */
dev_dbg(dev->device,
"dispatch request (nbytes=%d, src=%p, dst=%p)\n",
req->nbytes, req->src, req->dst);
/* assign new request to device */
- dev->req = req;
dev->total = req->nbytes;
dev->in_sg = req->src;
dev->out_sg = req->dst;
@@ -576,16 +525,25 @@ static void sahara_aes_queue_task(unsigned long data)
memcpy(dev->iv_base, req->info, AES_KEYSIZE_128);
/* assign new context to device */
- ctx->dev = dev;
dev->ctx = ctx;
+ reinit_completion(&dev->dma_completion);
+
ret = sahara_hw_descriptor_create(dev);
- if (ret < 0) {
- spin_lock(&dev->lock);
- clear_bit(FLAGS_BUSY, &dev->flags);
- spin_unlock(&dev->lock);
- dev->req->base.complete(&dev->req->base, ret);
+
+ ret = wait_for_completion_timeout(&dev->dma_completion,
+ msecs_to_jiffies(SAHARA_TIMEOUT_MS));
+ if (!ret) {
+ dev_err(dev->device, "AES timeout\n");
+ return -ETIMEDOUT;
}
+
+ dma_unmap_sg(dev->device, dev->out_sg, dev->nb_out_sg,
+ DMA_TO_DEVICE);
+ dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg,
+ DMA_FROM_DEVICE);
+
+ return 0;
}
static int sahara_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
@@ -627,12 +585,9 @@ static int sahara_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
static int sahara_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
{
- struct sahara_ctx *ctx = crypto_ablkcipher_ctx(
- crypto_ablkcipher_reqtfm(req));
struct sahara_aes_reqctx *rctx = ablkcipher_request_ctx(req);
struct sahara_dev *dev = dev_ptr;
int err = 0;
- int busy;
dev_dbg(dev->device, "nbytes: %d, enc: %d, cbc: %d\n",
req->nbytes, !!(mode & FLAGS_ENCRYPT), !!(mode & FLAGS_CBC));
@@ -643,16 +598,13 @@ static int sahara_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
return -EINVAL;
}
- ctx->dev = dev;
-
rctx->mode = mode;
- spin_lock_bh(&dev->lock);
+
+ mutex_lock(&dev->queue_mutex);
err = ablkcipher_enqueue_request(&dev->queue, req);
- busy = test_and_set_bit(FLAGS_BUSY, &dev->flags);
- spin_unlock_bh(&dev->lock);
+ mutex_unlock(&dev->queue_mutex);
- if (!busy)
- tasklet_schedule(&dev->queue_task);
+ wake_up_process(dev->kthread);
return err;
}
@@ -755,6 +707,36 @@ static void sahara_aes_cra_exit(struct crypto_tfm *tfm)
ctx->fallback = NULL;
}
+static int sahara_queue_manage(void *data)
+{
+ struct sahara_dev *dev = (struct sahara_dev *)data;
+ struct crypto_async_request *async_req;
+ int ret = 0;
+
+ do {
+ __set_current_state(TASK_INTERRUPTIBLE);
+
+ mutex_lock(&dev->queue_mutex);
+ async_req = crypto_dequeue_request(&dev->queue);
+ mutex_unlock(&dev->queue_mutex);
+
+ if (async_req) {
+ struct ablkcipher_request *req =
+ ablkcipher_request_cast(async_req);
+
+ ret = sahara_aes_process(req);
+
+ async_req->complete(async_req, ret);
+
+ continue;
+ }
+
+ schedule();
+ } while (!kthread_should_stop());
+
+ return 0;
+}
+
static struct crypto_alg aes_algs[] = {
{
.cra_name = "ecb(aes)",
@@ -806,8 +788,6 @@ static irqreturn_t sahara_irq_handler(int irq, void *data)
unsigned int stat = sahara_read(dev, SAHARA_REG_STATUS);
unsigned int err = sahara_read(dev, SAHARA_REG_ERRSTATUS);
- del_timer(&dev->watchdog);
-
sahara_write(dev, SAHARA_CMD_CLEAR_INT | SAHARA_CMD_CLEAR_ERR,
SAHARA_REG_CMD);
@@ -822,7 +802,7 @@ static irqreturn_t sahara_irq_handler(int irq, void *data)
dev->error = -EINVAL;
}
- tasklet_schedule(&dev->done_task);
+ complete(&dev->dma_completion);
return IRQ_HANDLED;
}
@@ -961,17 +941,17 @@ static int sahara_probe(struct platform_device *pdev)
crypto_init_queue(&dev->queue, SAHARA_QUEUE_LENGTH);
spin_lock_init(&dev->lock);
+ mutex_init(&dev->queue_mutex);
dev_ptr = dev;
- tasklet_init(&dev->queue_task, sahara_aes_queue_task,
- (unsigned long)dev);
- tasklet_init(&dev->done_task, sahara_aes_done_task,
- (unsigned long)dev);
+ dev->kthread = kthread_run(sahara_queue_manage, dev, "sahara_crypto");
+ if (IS_ERR(dev->kthread)) {
+ err = PTR_ERR(dev->kthread);
+ goto err_link;
+ }
- init_timer(&dev->watchdog);
- dev->watchdog.function = &sahara_watchdog;
- dev->watchdog.data = (unsigned long)dev;
+ init_completion(&dev->dma_completion);
clk_prepare_enable(dev->clk_ipg);
clk_prepare_enable(dev->clk_ahb);
@@ -1016,6 +996,7 @@ err_algs:
dev->hw_link[0], dev->hw_phys_link[0]);
clk_disable_unprepare(dev->clk_ipg);
clk_disable_unprepare(dev->clk_ahb);
+ kthread_stop(dev->kthread);
dev_ptr = NULL;
err_link:
dma_free_coherent(&pdev->dev,
@@ -1043,8 +1024,7 @@ static int sahara_remove(struct platform_device *pdev)
SAHARA_MAX_HW_DESC * sizeof(struct sahara_hw_desc),
dev->hw_desc[0], dev->hw_phys_desc[0]);
- tasklet_kill(&dev->done_task);
- tasklet_kill(&dev->queue_task);
+ kthread_stop(dev->kthread);
sahara_unregister_algs(dev);
--
2.1.3
^ permalink raw reply related [flat|nested] 7+ messages in thread* [PATCH v4 4/4] crypto: sahara - add support for SHA1/256
2014-12-01 12:26 [PATCH v4 0/4] crypto: sahara - SHA support Steffen Trumtrar
` (2 preceding siblings ...)
2014-12-01 12:26 ` [PATCH v4 3/4] crypto: sahara - replace tasklets with kthread Steffen Trumtrar
@ 2014-12-01 12:26 ` Steffen Trumtrar
2014-12-03 14:34 ` [PATCH v4 0/4] crypto: sahara - SHA support Herbert Xu
4 siblings, 0 replies; 7+ messages in thread
From: Steffen Trumtrar @ 2014-12-01 12:26 UTC (permalink / raw)
To: Herbert Xu, David S. Miller; +Cc: linux-crypto, kernel, Steffen Trumtrar
Add support for the MDHA unit in the SAHARA core.
The MDHA can generate hash digests for MD5 and SHA1 in version 3 and
additionally SHA224 and SHA256 in version 4.
Add the SHA1 and SHA256 algorithms to the driver.
The implementation was tested with the in-kernel testmgr and a userspace
testprogram using AF_ALG with+without upto 128 pthreads on each AES and
SHA256 on i.MX53.
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
---
drivers/crypto/sahara.c | 626 +++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 621 insertions(+), 5 deletions(-)
diff --git a/drivers/crypto/sahara.c b/drivers/crypto/sahara.c
index 04d3b4309e4c..579f539e5975 100644
--- a/drivers/crypto/sahara.c
+++ b/drivers/crypto/sahara.c
@@ -3,6 +3,7 @@
*
* Support for SAHARA cryptographic accelerator.
*
+ * Copyright (c) 2014 Steffen Trumtrar <s.trumtrar@pengutronix.de>
* Copyright (c) 2013 Vista Silicon S.L.
* Author: Javier Martin <javier.martin@vista-silicon.com>
*
@@ -15,6 +16,10 @@
#include <crypto/algapi.h>
#include <crypto/aes.h>
+#include <crypto/hash.h>
+#include <crypto/internal/hash.h>
+#include <crypto/scatterwalk.h>
+#include <crypto/sha.h>
#include <linux/clk.h>
#include <linux/crypto.h>
@@ -29,6 +34,9 @@
#include <linux/of_device.h>
#include <linux/platform_device.h>
+#define SHA_BUFFER_LEN PAGE_SIZE
+#define SAHARA_MAX_SHA_BLOCK_SIZE SHA256_BLOCK_SIZE
+
#define SAHARA_NAME "sahara"
#define SAHARA_VERSION_3 3
#define SAHARA_VERSION_4 4
@@ -53,6 +61,23 @@
#define SAHARA_HDR_CHA_MDHA (2 << 28)
#define SAHARA_HDR_PARITY_BIT (1 << 31)
+#define SAHARA_HDR_MDHA_SET_MODE_MD_KEY 0x20880000
+#define SAHARA_HDR_MDHA_SET_MODE_HASH 0x208D0000
+#define SAHARA_HDR_MDHA_HASH 0xA0850000
+#define SAHARA_HDR_MDHA_STORE_DIGEST 0x20820000
+#define SAHARA_HDR_MDHA_ALG_SHA1 0
+#define SAHARA_HDR_MDHA_ALG_MD5 1
+#define SAHARA_HDR_MDHA_ALG_SHA256 2
+#define SAHARA_HDR_MDHA_ALG_SHA224 3
+#define SAHARA_HDR_MDHA_PDATA (1 << 2)
+#define SAHARA_HDR_MDHA_HMAC (1 << 3)
+#define SAHARA_HDR_MDHA_INIT (1 << 5)
+#define SAHARA_HDR_MDHA_IPAD (1 << 6)
+#define SAHARA_HDR_MDHA_OPAD (1 << 7)
+#define SAHARA_HDR_MDHA_SWAP (1 << 8)
+#define SAHARA_HDR_MDHA_MAC_FULL (1 << 9)
+#define SAHARA_HDR_MDHA_SSL (1 << 10)
+
/* SAHARA can only process one request at a time */
#define SAHARA_QUEUE_LENGTH 1
@@ -121,15 +146,58 @@ struct sahara_hw_link {
struct sahara_ctx {
unsigned long flags;
+
+ /* AES-specific context */
int keylen;
u8 key[AES_KEYSIZE_128];
struct crypto_ablkcipher *fallback;
+
+ /* SHA-specific context */
+ struct crypto_shash *shash_fallback;
};
struct sahara_aes_reqctx {
unsigned long mode;
};
+/*
+ * struct sahara_sha_reqctx - private data per request
+ * @buf: holds data for requests smaller than block_size
+ * @rembuf: used to prepare one block_size-aligned request
+ * @context: hw-specific context for request. Digest is extracted from this
+ * @mode: specifies what type of hw-descriptor needs to be built
+ * @digest_size: length of digest for this request
+ * @context_size: length of hw-context for this request.
+ * Always digest_size + 4
+ * @buf_cnt: number of bytes saved in buf
+ * @sg_in_idx: number of hw links
+ * @in_sg: scatterlist for input data
+ * @in_sg_chain: scatterlists for chained input data
+ * @in_sg_chained: specifies if chained scatterlists are used or not
+ * @total: total number of bytes for transfer
+ * @last: is this the last block
+ * @first: is this the first block
+ * @active: inside a transfer
+ */
+struct sahara_sha_reqctx {
+ u8 buf[SAHARA_MAX_SHA_BLOCK_SIZE];
+ u8 rembuf[SAHARA_MAX_SHA_BLOCK_SIZE];
+ u8 context[SHA256_DIGEST_SIZE + 4];
+ struct mutex mutex;
+ unsigned int mode;
+ unsigned int digest_size;
+ unsigned int context_size;
+ unsigned int buf_cnt;
+ unsigned int sg_in_idx;
+ struct scatterlist *in_sg;
+ struct scatterlist in_sg_chain[2];
+ bool in_sg_chained;
+ size_t total;
+ unsigned int last;
+ unsigned int first;
+ unsigned int active;
+};
+
struct sahara_dev {
struct device *device;
unsigned int version;
@@ -154,6 +222,9 @@ struct sahara_dev {
u8 *iv_base;
dma_addr_t iv_phys_base;
+ u8 *context_base;
+ dma_addr_t context_phys_base;
+
struct sahara_hw_link *hw_link[SAHARA_MAX_HW_LINK];
dma_addr_t hw_phys_link[SAHARA_MAX_HW_LINK];
@@ -707,6 +778,316 @@ static void sahara_aes_cra_exit(struct crypto_tfm *tfm)
ctx->fallback = NULL;
}
+static u32 sahara_sha_init_hdr(struct sahara_dev *dev,
+ struct sahara_sha_reqctx *rctx)
+{
+ u32 hdr = 0;
+
+ hdr = rctx->mode;
+
+ if (rctx->first) {
+ hdr |= SAHARA_HDR_MDHA_SET_MODE_HASH;
+ hdr |= SAHARA_HDR_MDHA_INIT;
+ } else {
+ hdr |= SAHARA_HDR_MDHA_SET_MODE_MD_KEY;
+ }
+
+ if (rctx->last)
+ hdr |= SAHARA_HDR_MDHA_PDATA;
+
+ if (hweight_long(hdr) % 2 == 0)
+ hdr |= SAHARA_HDR_PARITY_BIT;
+
+ return hdr;
+}
+
+static int sahara_sha_hw_links_create(struct sahara_dev *dev,
+ struct sahara_sha_reqctx *rctx,
+ int start)
+{
+ struct scatterlist *sg;
+ unsigned int i;
+ int ret;
+
+ dev->in_sg = rctx->in_sg;
+
+ dev->nb_in_sg = sahara_sg_length(dev->in_sg, rctx->total);
+ if ((dev->nb_in_sg) > SAHARA_MAX_HW_LINK) {
+ dev_err(dev->device, "not enough hw links (%d)\n",
+ dev->nb_in_sg + dev->nb_out_sg);
+ return -EINVAL;
+ }
+
+ if (rctx->in_sg_chained) {
+ i = start;
+ sg = dev->in_sg;
+ while (sg) {
+ ret = dma_map_sg(dev->device, sg, 1,
+ DMA_TO_DEVICE);
+ if (!ret)
+ return -EFAULT;
+
+ dev->hw_link[i]->len = sg->length;
+ dev->hw_link[i]->p = sg->dma_address;
+ dev->hw_link[i]->next = dev->hw_phys_link[i + 1];
+ sg = sg_next(sg);
+ i += 1;
+ }
+ dev->hw_link[i-1]->next = 0;
+ } else {
+ sg = dev->in_sg;
+ ret = dma_map_sg(dev->device, dev->in_sg, dev->nb_in_sg,
+ DMA_TO_DEVICE);
+ if (!ret)
+ return -EFAULT;
+
+ for (i = start; i < dev->nb_in_sg + start; i++) {
+ dev->hw_link[i]->len = sg->length;
+ dev->hw_link[i]->p = sg->dma_address;
+ if (i == (dev->nb_in_sg + start - 1)) {
+ dev->hw_link[i]->next = 0;
+ } else {
+ dev->hw_link[i]->next = dev->hw_phys_link[i + 1];
+ sg = sg_next(sg);
+ }
+ }
+ }
+
+ return i;
+}
+
+static int sahara_sha_hw_data_descriptor_create(struct sahara_dev *dev,
+ struct sahara_sha_reqctx *rctx,
+ struct ahash_request *req,
+ int index)
+{
+ unsigned result_len;
+ int i = index;
+
+ if (rctx->first)
+ /* Create initial descriptor: #8*/
+ dev->hw_desc[index]->hdr = sahara_sha_init_hdr(dev, rctx);
+ else
+ /* Create hash descriptor: #10. Must follow #6. */
+ dev->hw_desc[index]->hdr = SAHARA_HDR_MDHA_HASH;
+
+ dev->hw_desc[index]->len1 = rctx->total;
+ if (dev->hw_desc[index]->len1 == 0) {
+ /* if len1 is 0, p1 must be 0, too */
+ dev->hw_desc[index]->p1 = 0;
+ rctx->sg_in_idx = 0;
+ } else {
+ /* Create input links */
+ dev->hw_desc[index]->p1 = dev->hw_phys_link[index];
+ i = sahara_sha_hw_links_create(dev, rctx, index);
+
+ rctx->sg_in_idx = index;
+ if (i < 0)
+ return i;
+ }
+
+ dev->hw_desc[index]->p2 = dev->hw_phys_link[i];
+
+ /* Save the context for the next operation */
+ result_len = rctx->context_size;
+ dev->hw_link[i]->p = dev->context_phys_base;
+
+ dev->hw_link[i]->len = result_len;
+ dev->hw_desc[index]->len2 = result_len;
+
+ dev->hw_link[i]->next = 0;
+
+ return 0;
+}
+
+/*
+ * Load descriptor aka #6
+ *
+ * To load a previously saved context back to the MDHA unit
+ *
+ * p1: Saved Context
+ * p2: NULL
+ *
+ */
+static int sahara_sha_hw_context_descriptor_create(struct sahara_dev *dev,
+ struct sahara_sha_reqctx *rctx,
+ struct ahash_request *req,
+ int index)
+{
+ dev->hw_desc[index]->hdr = sahara_sha_init_hdr(dev, rctx);
+
+ dev->hw_desc[index]->len1 = rctx->context_size;
+ dev->hw_desc[index]->p1 = dev->hw_phys_link[index];
+ dev->hw_desc[index]->len2 = 0;
+ dev->hw_desc[index]->p2 = 0;
+
+ dev->hw_link[index]->len = rctx->context_size;
+ dev->hw_link[index]->p = dev->context_phys_base;
+ dev->hw_link[index]->next = 0;
+
+ return 0;
+}
+
+static int sahara_walk_and_recalc(struct scatterlist *sg, unsigned int nbytes)
+{
+ if (!sg || !sg->length)
+ return nbytes;
+
+ while (nbytes && sg) {
+ if (nbytes <= sg->length) {
+ sg->length = nbytes;
+ sg_mark_end(sg);
+ break;
+ }
+ nbytes -= sg->length;
+ sg = scatterwalk_sg_next(sg);
+ }
+
+ return nbytes;
+}
+
+static int sahara_sha_prepare_request(struct ahash_request *req)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
+ unsigned int hash_later;
+ unsigned int block_size;
+ unsigned int len;
+
+ block_size = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
+
+ /* append bytes from previous operation */
+ len = rctx->buf_cnt + req->nbytes;
+
+ /* only the last transfer can be padded in hardware */
+ if (!rctx->last && (len < block_size)) {
+ /* to few data, save for next operation */
+ scatterwalk_map_and_copy(rctx->buf + rctx->buf_cnt, req->src,
+ 0, req->nbytes, 0);
+ rctx->buf_cnt += req->nbytes;
+
+ return 0;
+ }
+
+ /* add data from previous operation first */
+ if (rctx->buf_cnt)
+ memcpy(rctx->rembuf, rctx->buf, rctx->buf_cnt);
+
+ /* data must always be a multiple of block_size */
+ hash_later = rctx->last ? 0 : len & (block_size - 1);
+ if (hash_later) {
+ unsigned int offset = req->nbytes - hash_later;
+ /* Save remaining bytes for later use */
+ scatterwalk_map_and_copy(rctx->buf, req->src, offset,
+ hash_later, 0);
+ }
+
+ /* nbytes should now be multiple of blocksize */
+ req->nbytes = req->nbytes - hash_later;
+
+ sahara_walk_and_recalc(req->src, req->nbytes);
+
+ /* have data from previous operation and current */
+ if (rctx->buf_cnt && req->nbytes) {
+ sg_init_table(rctx->in_sg_chain, 2);
+ sg_set_buf(rctx->in_sg_chain, rctx->rembuf, rctx->buf_cnt);
+
+ scatterwalk_sg_chain(rctx->in_sg_chain, 2, req->src);
+
+ rctx->total = req->nbytes + rctx->buf_cnt;
+ rctx->in_sg = rctx->in_sg_chain;
+
+ rctx->in_sg_chained = true;
+ req->src = rctx->in_sg_chain;
+ /* only data from previous operation */
+ } else if (rctx->buf_cnt) {
+ if (req->src)
+ rctx->in_sg = req->src;
+ else
+ rctx->in_sg = rctx->in_sg_chain;
+ /* buf was copied into rembuf above */
+ sg_init_one(rctx->in_sg, rctx->rembuf, rctx->buf_cnt);
+ rctx->total = rctx->buf_cnt;
+ rctx->in_sg_chained = false;
+ /* no data from previous operation */
+ } else {
+ rctx->in_sg = req->src;
+ rctx->total = req->nbytes;
+ req->src = rctx->in_sg;
+ rctx->in_sg_chained = false;
+ }
+
+ /* on next call, we only have the remaining data in the buffer */
+ rctx->buf_cnt = hash_later;
+
+ return -EINPROGRESS;
+}
+
+static void sahara_sha_unmap_sg(struct sahara_dev *dev,
+ struct sahara_sha_reqctx *rctx)
+{
+ struct scatterlist *sg;
+
+ if (rctx->in_sg_chained) {
+ sg = dev->in_sg;
+ while (sg) {
+ dma_unmap_sg(dev->device, sg, 1, DMA_TO_DEVICE);
+ sg = sg_next(sg);
+ }
+ } else {
+ dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg,
+ DMA_TO_DEVICE);
+ }
+}
+
+static int sahara_sha_process(struct ahash_request *req)
+{
+ struct sahara_dev *dev = dev_ptr;
+ struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
+ int ret = -EINPROGRESS;
+
+ ret = sahara_sha_prepare_request(req);
+ if (!ret)
+ return ret;
+
+ if (rctx->first) {
+ sahara_sha_hw_data_descriptor_create(dev, rctx, req, 0);
+ dev->hw_desc[0]->next = 0;
+ rctx->first = 0;
+ } else {
+ memcpy(dev->context_base, rctx->context, rctx->context_size);
+
+ sahara_sha_hw_context_descriptor_create(dev, rctx, req, 0);
+ dev->hw_desc[0]->next = dev->hw_phys_desc[1];
+ sahara_sha_hw_data_descriptor_create(dev, rctx, req, 1);
+ dev->hw_desc[1]->next = 0;
+ }
+
+ sahara_dump_descriptors(dev);
+ sahara_dump_links(dev);
+
+ reinit_completion(&dev->dma_completion);
+
+ sahara_write(dev, dev->hw_phys_desc[0], SAHARA_REG_DAR);
+
+ ret = wait_for_completion_timeout(&dev->dma_completion,
+ msecs_to_jiffies(SAHARA_TIMEOUT_MS));
+ if (!ret) {
+ dev_err(dev->device, "SHA timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ if (rctx->sg_in_idx)
+ sahara_sha_unmap_sg(dev, rctx);
+
+ memcpy(rctx->context, dev->context_base, rctx->context_size);
+
+ if (req->result)
+ memcpy(req->result, rctx->context, rctx->digest_size);
+
+ return 0;
+}
+
static int sahara_queue_manage(void *data)
{
struct sahara_dev *dev = (struct sahara_dev *)data;
@@ -721,10 +1102,18 @@ static int sahara_queue_manage(void *data)
mutex_unlock(&dev->queue_mutex);
if (async_req) {
- struct ablkcipher_request *req =
- ablkcipher_request_cast(async_req);
+ if (crypto_tfm_alg_type(async_req->tfm) ==
+ CRYPTO_ALG_TYPE_AHASH) {
+ struct ahash_request *req =
+ ahash_request_cast(async_req);
+
+ ret = sahara_sha_process(req);
+ } else {
+ struct ablkcipher_request *req =
+ ablkcipher_request_cast(async_req);
- ret = sahara_aes_process(req);
+ ret = sahara_aes_process(req);
+ }
async_req->complete(async_req, ret);
@@ -737,6 +1126,136 @@ static int sahara_queue_manage(void *data)
return 0;
}
+static int sahara_sha_enqueue(struct ahash_request *req, int last)
+{
+ struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
+ struct sahara_dev *dev = dev_ptr;
+ int ret;
+
+ if (!req->nbytes && !last)
+ return 0;
+
+ mutex_lock(&rctx->mutex);
+ rctx->last = last;
+
+ if (!rctx->active) {
+ rctx->active = 1;
+ rctx->first = 1;
+ }
+
+ mutex_lock(&dev->queue_mutex);
+ ret = crypto_enqueue_request(&dev->queue, &req->base);
+ mutex_unlock(&dev->queue_mutex);
+
+ wake_up_process(dev->kthread);
+ mutex_unlock(&rctx->mutex);
+
+ return ret;
+}
+
+static int sahara_sha_init(struct ahash_request *req)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
+
+ memset(rctx, 0, sizeof(*rctx));
+
+ switch (crypto_ahash_digestsize(tfm)) {
+ case SHA1_DIGEST_SIZE:
+ rctx->mode |= SAHARA_HDR_MDHA_ALG_SHA1;
+ rctx->digest_size = SHA1_DIGEST_SIZE;
+ break;
+ case SHA256_DIGEST_SIZE:
+ rctx->mode |= SAHARA_HDR_MDHA_ALG_SHA256;
+ rctx->digest_size = SHA256_DIGEST_SIZE;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ rctx->context_size = rctx->digest_size + 4;
+ rctx->active = 0;
+
+ mutex_init(&rctx->mutex);
+
+ return 0;
+}
+
+static int sahara_sha_update(struct ahash_request *req)
+{
+ return sahara_sha_enqueue(req, 0);
+}
+
+static int sahara_sha_final(struct ahash_request *req)
+{
+ req->nbytes = 0;
+ return sahara_sha_enqueue(req, 1);
+}
+
+static int sahara_sha_finup(struct ahash_request *req)
+{
+ return sahara_sha_enqueue(req, 1);
+}
+
+static int sahara_sha_digest(struct ahash_request *req)
+{
+ sahara_sha_init(req);
+
+ return sahara_sha_finup(req);
+}
+
+static int sahara_sha_export(struct ahash_request *req, void *out)
+{
+ struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
+ struct sahara_ctx *ctx = crypto_ahash_ctx(ahash);
+ struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
+
+ memcpy(out, ctx, sizeof(struct sahara_ctx));
+ memcpy(out + sizeof(struct sahara_sha_reqctx), rctx,
+ sizeof(struct sahara_sha_reqctx));
+
+ return 0;
+}
+
+static int sahara_sha_import(struct ahash_request *req, const void *in)
+{
+ struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
+ struct sahara_ctx *ctx = crypto_ahash_ctx(ahash);
+ struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
+
+ memcpy(ctx, in, sizeof(struct sahara_ctx));
+ memcpy(rctx, in + sizeof(struct sahara_sha_reqctx),
+ sizeof(struct sahara_sha_reqctx));
+
+ return 0;
+}
+
+static int sahara_sha_cra_init(struct crypto_tfm *tfm)
+{
+ const char *name = crypto_tfm_alg_name(tfm);
+ struct sahara_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ ctx->shash_fallback = crypto_alloc_shash(name, 0,
+ CRYPTO_ALG_NEED_FALLBACK);
+ if (IS_ERR(ctx->shash_fallback)) {
+ pr_err("Error allocating fallback algo %s\n", name);
+ return PTR_ERR(ctx->shash_fallback);
+ }
+ crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
+ sizeof(struct sahara_sha_reqctx) +
+ SHA_BUFFER_LEN + SHA256_BLOCK_SIZE);
+
+ return 0;
+}
+
+static void sahara_sha_cra_exit(struct crypto_tfm *tfm)
+{
+ struct sahara_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ crypto_free_shash(ctx->shash_fallback);
+ ctx->shash_fallback = NULL;
+}
+
static struct crypto_alg aes_algs[] = {
{
.cra_name = "ecb(aes)",
@@ -782,6 +1301,60 @@ static struct crypto_alg aes_algs[] = {
}
};
+static struct ahash_alg sha_v3_algs[] = {
+{
+ .init = sahara_sha_init,
+ .update = sahara_sha_update,
+ .final = sahara_sha_final,
+ .finup = sahara_sha_finup,
+ .digest = sahara_sha_digest,
+ .export = sahara_sha_export,
+ .import = sahara_sha_import,
+ .halg.digestsize = SHA1_DIGEST_SIZE,
+ .halg.base = {
+ .cra_name = "sha1",
+ .cra_driver_name = "sahara-sha1",
+ .cra_priority = 300,
+ .cra_flags = CRYPTO_ALG_TYPE_AHASH |
+ CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_NEED_FALLBACK,
+ .cra_blocksize = SHA1_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct sahara_ctx),
+ .cra_alignmask = 0,
+ .cra_module = THIS_MODULE,
+ .cra_init = sahara_sha_cra_init,
+ .cra_exit = sahara_sha_cra_exit,
+ }
+},
+};
+
+static struct ahash_alg sha_v4_algs[] = {
+{
+ .init = sahara_sha_init,
+ .update = sahara_sha_update,
+ .final = sahara_sha_final,
+ .finup = sahara_sha_finup,
+ .digest = sahara_sha_digest,
+ .export = sahara_sha_export,
+ .import = sahara_sha_import,
+ .halg.digestsize = SHA256_DIGEST_SIZE,
+ .halg.base = {
+ .cra_name = "sha256",
+ .cra_driver_name = "sahara-sha256",
+ .cra_priority = 300,
+ .cra_flags = CRYPTO_ALG_TYPE_AHASH |
+ CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_NEED_FALLBACK,
+ .cra_blocksize = SHA256_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct sahara_ctx),
+ .cra_alignmask = 0,
+ .cra_module = THIS_MODULE,
+ .cra_init = sahara_sha_cra_init,
+ .cra_exit = sahara_sha_cra_exit,
+ }
+},
+};
+
static irqreturn_t sahara_irq_handler(int irq, void *data)
{
struct sahara_dev *dev = (struct sahara_dev *)data;
@@ -810,7 +1383,8 @@ static irqreturn_t sahara_irq_handler(int irq, void *data)
static int sahara_register_algs(struct sahara_dev *dev)
{
- int err, i, j;
+ int err;
+ unsigned int i, j, k, l;
for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
INIT_LIST_HEAD(&aes_algs[i].cra_list);
@@ -819,8 +1393,29 @@ static int sahara_register_algs(struct sahara_dev *dev)
goto err_aes_algs;
}
+ for (k = 0; k < ARRAY_SIZE(sha_v3_algs); k++) {
+ err = crypto_register_ahash(&sha_v3_algs[k]);
+ if (err)
+ goto err_sha_v3_algs;
+ }
+
+ if (dev->version > SAHARA_VERSION_3)
+ for (l = 0; l < ARRAY_SIZE(sha_v4_algs); l++) {
+ err = crypto_register_ahash(&sha_v4_algs[l]);
+ if (err)
+ goto err_sha_v4_algs;
+ }
+
return 0;
+err_sha_v4_algs:
+ for (j = 0; j < l; j++)
+ crypto_unregister_ahash(&sha_v4_algs[j]);
+
+err_sha_v3_algs:
+ for (j = 0; j < k; j++)
+ crypto_unregister_ahash(&sha_v4_algs[j]);
+
err_aes_algs:
for (j = 0; j < i; j++)
crypto_unregister_alg(&aes_algs[j]);
@@ -830,10 +1425,17 @@ err_aes_algs:
static void sahara_unregister_algs(struct sahara_dev *dev)
{
- int i;
+ unsigned int i;
for (i = 0; i < ARRAY_SIZE(aes_algs); i++)
crypto_unregister_alg(&aes_algs[i]);
+
+ for (i = 0; i < ARRAY_SIZE(sha_v4_algs); i++)
+ crypto_unregister_ahash(&sha_v3_algs[i]);
+
+ if (dev->version > SAHARA_VERSION_3)
+ for (i = 0; i < ARRAY_SIZE(sha_v4_algs); i++)
+ crypto_unregister_ahash(&sha_v4_algs[i]);
}
static struct platform_device_id sahara_platform_ids[] = {
@@ -923,6 +1525,16 @@ static int sahara_probe(struct platform_device *pdev)
dev->iv_base = dev->key_base + AES_KEYSIZE_128;
dev->iv_phys_base = dev->key_phys_base + AES_KEYSIZE_128;
+ /* Allocate space for context: largest digest + message length field */
+ dev->context_base = dma_alloc_coherent(&pdev->dev,
+ SHA256_DIGEST_SIZE + 4,
+ &dev->context_phys_base, GFP_KERNEL);
+ if (!dev->context_base) {
+ dev_err(&pdev->dev, "Could not allocate memory for MDHA context\n");
+ err = -ENOMEM;
+ goto err_key;
+ }
+
/* Allocate space for HW links */
dev->hw_link[0] = dma_alloc_coherent(&pdev->dev,
SAHARA_MAX_HW_LINK * sizeof(struct sahara_hw_link),
@@ -1002,6 +1614,9 @@ err_link:
dma_free_coherent(&pdev->dev,
2 * AES_KEYSIZE_128,
dev->key_base, dev->key_phys_base);
+ dma_free_coherent(&pdev->dev,
+ SHA256_DIGEST_SIZE,
+ dev->context_base, dev->context_phys_base);
err_key:
dma_free_coherent(&pdev->dev,
SAHARA_MAX_HW_DESC * sizeof(struct sahara_hw_desc),
@@ -1051,4 +1666,5 @@ module_platform_driver(sahara_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Javier Martin <javier.martin@vista-silicon.com>");
+MODULE_AUTHOR("Steffen Trumtrar <s.trumtrar@pengutronix.de>");
MODULE_DESCRIPTION("SAHARA2 HW crypto accelerator");
--
2.1.3
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