crypto: caam - Using alloc_coherent for caam job rings

The caam job rings (input/output job ring) are allocated using
dma_map_single(). These job rings can be visualized as the ring
buffers in which the jobs are en-queued/de-queued. The s/w enqueues
the jobs in input job ring which h/w dequeues and after processing
it copies the jobs in output job ring. Software then de-queues the
job from output ring. Using dma_map/unmap_single() is not preferred
way to allocate memory for this type of requirements because this
adds un-necessary complexity.

Example, if bounce buffer (SWIOTLB) will get used then to make any
change visible in this memory to other processing unit requires
dmap_unmap_single() or dma_sync_single_for_cpu/device(). The
dma_unmap_single() can not be used as this will free the bounce
buffer, this will require changing the job rings on running system
and I seriously doubt that it will be not possible or very complex
to implement. Also using dma_sync_single_for_cpu/device() will also
add unnecessary complexity.

The simple and preferred way is using dma_alloc_coherent() for these
type of memory requirements.

This resolves the Linux boot crash issue when "swiotlb=force" is set
in bootargs on systems which have memory more than 4G.

Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Acked-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c
index 7074a1a..53c8c51 100644 (file)
--- a/drivers/crypto/caam/jr.c
+++ b/drivers/crypto/caam/jr.c
@@ -339,10 +339,11 @@ static int caam_jr_init(struct device *dev)
        if (error)
                return error;
 
-       jrp->inpring = kzalloc(sizeof(dma_addr_t) * JOBR_DEPTH,
-                              GFP_KERNEL | GFP_DMA);
-       jrp->outring = kzalloc(sizeof(struct jr_outentry) *
-                              JOBR_DEPTH, GFP_KERNEL | GFP_DMA);
+       jrp->inpring = dma_alloc_coherent(dev, sizeof(dma_addr_t) * JOBR_DEPTH,
+                                         &inpbusaddr, GFP_KERNEL);
+
+       jrp->outring = dma_alloc_coherent(dev, sizeof(struct jr_outentry) *
+                                         JOBR_DEPTH, &outbusaddr, GFP_KERNEL);
 
        jrp->entinfo = kzalloc(sizeof(struct caam_jrentry_info) * JOBR_DEPTH,
                               GFP_KERNEL);
@@ -358,31 +359,6 @@ static int caam_jr_init(struct device *dev)
                jrp->entinfo[i].desc_addr_dma = !0;
 
        /* Setup rings */
-       inpbusaddr = dma_map_single(dev, jrp->inpring,
-                                   sizeof(dma_addr_t) * JOBR_DEPTH,
-                                   DMA_BIDIRECTIONAL);
-       if (dma_mapping_error(dev, inpbusaddr)) {
-               dev_err(dev, "caam_jr_init(): can't map input ring\n");
-               kfree(jrp->inpring);
-               kfree(jrp->outring);
-               kfree(jrp->entinfo);
-               return -EIO;
-       }
-
-       outbusaddr = dma_map_single(dev, jrp->outring,
-                                   sizeof(struct jr_outentry) * JOBR_DEPTH,
-                                   DMA_BIDIRECTIONAL);
-       if (dma_mapping_error(dev, outbusaddr)) {
-               dev_err(dev, "caam_jr_init(): can't map output ring\n");
-               dma_unmap_single(dev, inpbusaddr,
-                                sizeof(dma_addr_t) * JOBR_DEPTH,
-                                DMA_BIDIRECTIONAL);
-               kfree(jrp->inpring);
-               kfree(jrp->outring);
-               kfree(jrp->entinfo);
-               return -EIO;
-       }
-
        jrp->inp_ring_write_index = 0;
        jrp->out_ring_read_index = 0;
        jrp->head = 0;
@@ -426,13 +402,10 @@ int caam_jr_shutdown(struct device *dev)
        /* Free rings */
        inpbusaddr = rd_reg64(&jrp->rregs->inpring_base);
        outbusaddr = rd_reg64(&jrp->rregs->outring_base);
-       dma_unmap_single(dev, outbusaddr,
-                        sizeof(struct jr_outentry) * JOBR_DEPTH,
-                        DMA_BIDIRECTIONAL);
-       dma_unmap_single(dev, inpbusaddr, sizeof(dma_addr_t) * JOBR_DEPTH,
-                        DMA_BIDIRECTIONAL);
-       kfree(jrp->outring);
-       kfree(jrp->inpring);
+       dma_free_coherent(dev, sizeof(dma_addr_t) * JOBR_DEPTH,
+                         jrp->inpring, inpbusaddr);
+       dma_free_coherent(dev, sizeof(struct jr_outentry) * JOBR_DEPTH,
+                         jrp->outring, outbusaddr);
        kfree(jrp->entinfo);
 
        return ret;