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Commit 4bba1e9f authored by Kim Phillips's avatar Kim Phillips Committed by Herbert Xu
Browse files

crypto: caam - use non-irq versions of spinlocks for job rings 



The enqueue lock isn't used in any interrupt context, and
the dequeue lock isn't used in the h/w interrupt context,
only in bh context.

Signed-off-by: default avatarKim Phillips <kim.phillips@freescale.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 1a076689

drivers/crypto/caam/jr.c

+13 −17
Original line number Diff line number Diff line
@@ -2,7 +2,7 @@ 
 * CAAM/SEC 4.x transport/backend driver

 * JobR backend functionality

 *

 * Copyright 2008-2011 Freescale Semiconductor, Inc.

 * Copyright 2008-2012 Freescale Semiconductor, Inc.

 */



#include "compat.h"
@@ -58,9 +58,8 @@ static void caam_jr_dequeue(unsigned long devarg) 
	void (*usercall)(struct device *dev, u32 *desc, u32 status, void *arg);

	u32 *userdesc, userstatus;

	void *userarg;

	unsigned long flags;



	spin_lock_irqsave(&jrp->outlock, flags);

	spin_lock_bh(&jrp->outlock);



	head = ACCESS_ONCE(jrp->head);

	sw_idx = tail = jrp->tail;
@@ -118,18 +117,18 @@ static void caam_jr_dequeue(unsigned long devarg) 
		/* set done */

		wr_reg32(&jrp->rregs->outring_rmvd, 1);



		spin_unlock_irqrestore(&jrp->outlock, flags);

		spin_unlock_bh(&jrp->outlock);



		/* Finally, execute user's callback */

		usercall(dev, userdesc, userstatus, userarg);



		spin_lock_irqsave(&jrp->outlock, flags);

		spin_lock_bh(&jrp->outlock);



		head = ACCESS_ONCE(jrp->head);

		sw_idx = tail = jrp->tail;

	}



	spin_unlock_irqrestore(&jrp->outlock, flags);

	spin_unlock_bh(&jrp->outlock);



	/* reenable / unmask IRQs */

	clrbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
@@ -148,23 +147,22 @@ int caam_jr_register(struct device *ctrldev, struct device **rdev) 
{

	struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev);

	struct caam_drv_private_jr *jrpriv = NULL;

	unsigned long flags;

	int ring;



	/* Lock, if free ring - assign, unlock */

	spin_lock_irqsave(&ctrlpriv->jr_alloc_lock, flags);

	spin_lock(&ctrlpriv->jr_alloc_lock);

	for (ring = 0; ring < ctrlpriv->total_jobrs; ring++) {

		jrpriv = dev_get_drvdata(ctrlpriv->jrdev[ring]);

		if (jrpriv->assign == JOBR_UNASSIGNED) {

			jrpriv->assign = JOBR_ASSIGNED;

			*rdev = ctrlpriv->jrdev[ring];

			spin_unlock_irqrestore(&ctrlpriv->jr_alloc_lock, flags);

			spin_unlock(&ctrlpriv->jr_alloc_lock);

			return ring;

		}

	}



	/* If assigned, write dev where caller needs it */

	spin_unlock_irqrestore(&ctrlpriv->jr_alloc_lock, flags);

	spin_unlock(&ctrlpriv->jr_alloc_lock);

	*rdev = NULL;



	return -ENODEV;
@@ -182,7 +180,6 @@ int caam_jr_deregister(struct device *rdev) 
{

	struct caam_drv_private_jr *jrpriv = dev_get_drvdata(rdev);

	struct caam_drv_private *ctrlpriv;

	unsigned long flags;



	/* Get the owning controller's private space */

	ctrlpriv = dev_get_drvdata(jrpriv->parentdev);
@@ -195,9 +192,9 @@ int caam_jr_deregister(struct device *rdev) 
		return -EBUSY;



	/* Release ring */

	spin_lock_irqsave(&ctrlpriv->jr_alloc_lock, flags);

	spin_lock(&ctrlpriv->jr_alloc_lock);

	jrpriv->assign = JOBR_UNASSIGNED;

	spin_unlock_irqrestore(&ctrlpriv->jr_alloc_lock, flags);

	spin_unlock(&ctrlpriv->jr_alloc_lock);



	return 0;

}
@@ -238,7 +235,6 @@ int caam_jr_enqueue(struct device *dev, u32 *desc, 
{

	struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);

	struct caam_jrentry_info *head_entry;

	unsigned long flags;

	int head, tail, desc_size;

	dma_addr_t desc_dma;
@@ -249,14 +245,14 @@ int caam_jr_enqueue(struct device *dev, u32 *desc, 
		return -EIO;

	}



	spin_lock_irqsave(&jrp->inplock, flags);

	spin_lock(&jrp->inplock);



	head = jrp->head;

	tail = ACCESS_ONCE(jrp->tail);



	if (!rd_reg32(&jrp->rregs->inpring_avail) ||

	    CIRC_SPACE(head, tail, JOBR_DEPTH) <= 0) {

		spin_unlock_irqrestore(&jrp->inplock, flags);

		spin_unlock(&jrp->inplock);

		dma_unmap_single(dev, desc_dma, desc_size, DMA_TO_DEVICE);

		return -EBUSY;

	}
@@ -280,7 +276,7 @@ int caam_jr_enqueue(struct device *dev, u32 *desc, 


	wr_reg32(&jrp->rregs->inpring_jobadd, 1);



	spin_unlock_irqrestore(&jrp->inplock, flags);

	spin_unlock(&jrp->inplock);



	return 0;

}