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Commit 8256e683 authored by Gary R Hook's avatar Gary R Hook Committed by Herbert Xu
Browse files

crypto: ccp - Refactor code supporting the CCP's RNG 



Make the RNG support code common (where possible) in
preparation for adding a v5 device.

Signed-off-by: default avatarGary R Hook <gary.hook@amd.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 58a690b7

drivers/crypto/ccp/ccp-dev-v3.c

+11 −40
Original line number Diff line number Diff line
@@ -307,35 +307,6 @@ static int ccp_perform_ecc(struct ccp_op *op) 
	return ccp_do_cmd(op, cr, ARRAY_SIZE(cr));

}



static int ccp_trng_read(struct hwrng *rng, void *data, size_t max, bool wait)

{

	struct ccp_device *ccp = container_of(rng, struct ccp_device, hwrng);

	u32 trng_value;

	int len = min_t(int, sizeof(trng_value), max);



	/*

	 * Locking is provided by the caller so we can update device

	 * hwrng-related fields safely

	 */

	trng_value = ioread32(ccp->io_regs + TRNG_OUT_REG);

	if (!trng_value) {

		/* Zero is returned if not data is available or if a

		 * bad-entropy error is present. Assume an error if

		 * we exceed TRNG_RETRIES reads of zero.

		 */

		if (ccp->hwrng_retries++ > TRNG_RETRIES)

			return -EIO;



		return 0;

	}



	/* Reset the counter and save the rng value */

	ccp->hwrng_retries = 0;

	memcpy(data, &trng_value, len);



	return len;

}



static int ccp_init(struct ccp_device *ccp)

{

	struct device *dev = ccp->dev;
@@ -495,17 +466,6 @@ static void ccp_destroy(struct ccp_device *ccp) 
	/* Remove this device from the list of available units first */

	ccp_del_device(ccp);



	/* Unregister the DMA engine */

	ccp_dmaengine_unregister(ccp);



	/* Unregister the RNG */

	hwrng_unregister(&ccp->hwrng);



	/* Stop the queue kthreads */

	for (i = 0; i < ccp->cmd_q_count; i++)

		if (ccp->cmd_q[i].kthread)

			kthread_stop(ccp->cmd_q[i].kthread);



	/* Build queue interrupt mask (two interrupt masks per queue) */

	qim = 0;

	for (i = 0; i < ccp->cmd_q_count; i++) {
@@ -523,6 +483,17 @@ static void ccp_destroy(struct ccp_device *ccp) 
	}

	iowrite32(qim, ccp->io_regs + IRQ_STATUS_REG);



	/* Unregister the DMA engine */

	ccp_dmaengine_unregister(ccp);



	/* Unregister the RNG */

	hwrng_unregister(&ccp->hwrng);



	/* Stop the queue kthreads */

	for (i = 0; i < ccp->cmd_q_count; i++)

		if (ccp->cmd_q[i].kthread)

			kthread_stop(ccp->cmd_q[i].kthread);



	ccp->free_irq(ccp);



	for (i = 0; i < ccp->cmd_q_count; i++)

drivers/crypto/ccp/ccp-dev.c

+28 −0
Original line number Diff line number Diff line
@@ -409,6 +409,34 @@ struct ccp_device *ccp_alloc_struct(struct device *dev) 
	return ccp;

}



int ccp_trng_read(struct hwrng *rng, void *data, size_t max, bool wait)

{

	struct ccp_device *ccp = container_of(rng, struct ccp_device, hwrng);

	u32 trng_value;

	int len = min_t(int, sizeof(trng_value), max);



	/* Locking is provided by the caller so we can update device

	 * hwrng-related fields safely

	 */

	trng_value = ioread32(ccp->io_regs + TRNG_OUT_REG);

	if (!trng_value) {

		/* Zero is returned if not data is available or if a

		 * bad-entropy error is present. Assume an error if

		 * we exceed TRNG_RETRIES reads of zero.

		 */

		if (ccp->hwrng_retries++ > TRNG_RETRIES)

			return -EIO;



		return 0;

	}



	/* Reset the counter and save the rng value */

	ccp->hwrng_retries = 0;

	memcpy(data, &trng_value, len);



	return len;

}



#ifdef CONFIG_PM

bool ccp_queues_suspended(struct ccp_device *ccp)

{

drivers/crypto/ccp/ccp-dev.h

+1 −0
Original line number Diff line number Diff line
@@ -440,6 +440,7 @@ void ccp_del_device(struct ccp_device *ccp); 
struct ccp_device *ccp_alloc_struct(struct device *dev);

bool ccp_queues_suspended(struct ccp_device *ccp);

int ccp_cmd_queue_thread(void *data);

int ccp_trng_read(struct hwrng *rng, void *data, size_t max, bool wait);



int ccp_run_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd);