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crypto: mv_cesa - add an expiry timer in case anything goes wrong

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The timer triggers when 500ms have gone by after triggering the engine
and no completion interrupt was received. The callback then tries to
sanitise things as well as possible.

Signed-off-by: Phil Sutter <phil.sutter@viprinet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Phil Sutter 2012-05-25 15:54:46 +02:00 committed by Herbert Xu
parent b8840098b7
commit 170dd56dfc
1 changed files with 31 additions and 10 deletions
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41
drivers/crypto/mv_cesa.c
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@ -24,6 +24,7 @@
#define MV_CESA "MV-CESA:"
#define MAX_HW_HASH_SIZE 0xFFFF
#define MV_CESA_EXPIRE 500 /* msec */
/*
* STM:
@ -87,6 +88,7 @@ struct crypto_priv {
spinlock_t lock;
struct crypto_queue queue;
enum engine_status eng_st;
struct timer_list completion_timer;
struct crypto_async_request *cur_req;
struct req_progress p;
int max_req_size;
@ -138,6 +140,29 @@ struct mv_req_hash_ctx {
int count_add;
};
static void mv_completion_timer_callback(unsigned long unused)
{
int active = readl(cpg->reg + SEC_ACCEL_CMD) & SEC_CMD_EN_SEC_ACCL0;
printk(KERN_ERR MV_CESA
"completion timer expired (CESA %sactive), cleaning up.\n",
active ? "" : "in");
del_timer(&cpg->completion_timer);
writel(SEC_CMD_DISABLE_SEC, cpg->reg + SEC_ACCEL_CMD);
while(readl(cpg->reg + SEC_ACCEL_CMD) & SEC_CMD_DISABLE_SEC)
printk(KERN_INFO MV_CESA "%s: waiting for engine finishing\n", __func__);
cpg->eng_st = ENGINE_W_DEQUEUE;
wake_up_process(cpg->queue_th);
}
static void mv_setup_timer(void)
{
setup_timer(&cpg->completion_timer, &mv_completion_timer_callback, 0);
mod_timer(&cpg->completion_timer,
jiffies + msecs_to_jiffies(MV_CESA_EXPIRE));
}
static void compute_aes_dec_key(struct mv_ctx *ctx)
{
struct crypto_aes_ctx gen_aes_key;
@ -273,12 +298,8 @@ static void mv_process_current_q(int first_block)
sizeof(struct sec_accel_config));
/* GO */
mv_setup_timer();
writel(SEC_CMD_EN_SEC_ACCL0, cpg->reg + SEC_ACCEL_CMD);
/*
* XXX: add timer if the interrupt does not occur for some mystery
* reason
*/
}
static void mv_crypto_algo_completion(void)
@ -357,12 +378,8 @@ static void mv_process_hash_current(int first_block)
memcpy(cpg->sram + SRAM_CONFIG, &op, sizeof(struct sec_accel_config));
/* GO */
mv_setup_timer();
writel(SEC_CMD_EN_SEC_ACCL0, cpg->reg + SEC_ACCEL_CMD);
/*
* XXX: add timer if the interrupt does not occur for some mystery
* reason
*/
}
static inline int mv_hash_import_sha1_ctx(const struct mv_req_hash_ctx *ctx,
@ -888,6 +905,10 @@ irqreturn_t crypto_int(int irq, void *priv)
if (!(val & SEC_INT_ACCEL0_DONE))
return IRQ_NONE;
if (!del_timer(&cpg->completion_timer)) {
printk(KERN_WARNING MV_CESA
"got an interrupt but no pending timer?\n");
}
val &= ~SEC_INT_ACCEL0_DONE;
writel(val, cpg->reg + FPGA_INT_STATUS);
writel(val, cpg->reg + SEC_ACCEL_INT_STATUS);