[PATCH 2/7] crypto: marvell: Check engine is not already running when enabling a req

Hello,

Le 15/06/2016 21:37, Boris Brezillon a ?crit :

"
Add a BUG_ON() call when the driver tries to launch a crypto request
while the engine is still processing the previous one. This replaces
a silent system hang by a verbose kernel panic with the associated
backtrace to let the user know that something went wrong in the CESA
driver.
"

thanks

quoted

---
  drivers/crypto/marvell/cipher.c | 2 ++
  drivers/crypto/marvell/hash.c   | 2 ++
  drivers/crypto/marvell/tdma.c   | 2 ++
  3 files changed, 6 insertions(+)

diff --git a/drivers/crypto/marvell/cipher.c b/drivers/crypto/marvell/cipher.c
index dcf1fce..8d0fabb 100644
--- a/drivers/crypto/marvell/cipher.c
+++ b/drivers/crypto/marvell/cipher.c

@@ -106,6 +106,8 @@ static void mv_cesa_ablkcipher_std_step(struct ablkcipher_request *req)

  	mv_cesa_set_int_mask(engine, CESA_SA_INT_ACCEL0_DONE);
  	writel_relaxed(CESA_SA_CFG_PARA_DIS, engine->regs + CESA_SA_CFG);
+	BUG_ON(readl(engine->regs + CESA_SA_CMD)
+				  & CESA_SA_CMD_EN_CESA_SA_ACCL0);

Nit: please put the '&' operator at the end of the first line and
align CESA_SA_CMD_EN_CESA_SA_ACCL0 on the open parenthesis.

Arf, ok I will fix this.

	BUG_ON(readl(engine->regs + CESA_SA_CMD) &
	       CESA_SA_CMD_EN_CESA_SA_ACCL0);

quoted

  	writel(CESA_SA_CMD_EN_CESA_SA_ACCL0, engine->regs + CESA_SA_CMD);
  }

diff --git a/drivers/crypto/marvell/hash.c b/drivers/crypto/marvell/hash.c
index 7ca2e0f..0fae351 100644
--- a/drivers/crypto/marvell/hash.c
+++ b/drivers/crypto/marvell/hash.c

@@ -237,6 +237,8 @@ static void mv_cesa_ahash_std_step(struct ahash_request *req)

  	mv_cesa_set_int_mask(engine, CESA_SA_INT_ACCEL0_DONE);
  	writel_relaxed(CESA_SA_CFG_PARA_DIS, engine->regs + CESA_SA_CFG);
+	BUG_ON(readl(engine->regs + CESA_SA_CMD)
+				  & CESA_SA_CMD_EN_CESA_SA_ACCL0);

Ditto.

ack

quoted

  	writel(CESA_SA_CMD_EN_CESA_SA_ACCL0, engine->regs + CESA_SA_CMD);
  }

diff --git a/drivers/crypto/marvell/tdma.c b/drivers/crypto/marvell/tdma.c
index 7642798..d493714 100644
--- a/drivers/crypto/marvell/tdma.c
+++ b/drivers/crypto/marvell/tdma.c

@@ -53,6 +53,8 @@ void mv_cesa_dma_step(struct mv_cesa_tdma_req *dreq)
  		       engine->regs + CESA_SA_CFG);
  	writel_relaxed(dreq->chain.first->cur_dma,
  		       engine->regs + CESA_TDMA_NEXT_ADDR);
+	BUG_ON(readl(engine->regs + CESA_SA_CMD)
+				  & CESA_SA_CMD_EN_CESA_SA_ACCL0);

Ditto.

ack

Regards,
Romain
-- 
Romain Perier, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com