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Subject[PATCH 13/18] 53c700: convert to dma_alloc_noncoherent
Date
Use the new non-coherent DMA API including proper ownership transfers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/scsi/53c700.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/53c700.c b/drivers/scsi/53c700.c
index c59226d7e2f6b5..5117d90ccd9edf 100644
--- a/drivers/scsi/53c700.c
+++ b/drivers/scsi/53c700.c
@@ -269,18 +269,25 @@ NCR_700_get_SXFER(struct scsi_device *SDp)
spi_period(SDp->sdev_target));
}

+static inline dma_addr_t virt_to_dma(struct NCR_700_Host_Parameters *h, void *p)
+{
+ return h->pScript + ((uintptr_t)p - (uintptr_t)h->script);
+}
+
static inline void dma_sync_to_dev(struct NCR_700_Host_Parameters *h,
void *addr, size_t size)
{
if (h->noncoherent)
- dma_cache_sync(h->dev, addr, size, DMA_TO_DEVICE);
+ dma_sync_single_for_device(h->dev, virt_to_dma(h, addr),
+ size, DMA_BIDIRECTIONAL);
}

static inline void dma_sync_from_dev(struct NCR_700_Host_Parameters *h,
void *addr, size_t size)
{
if (h->noncoherent)
- dma_cache_sync(h->dev, addr, size, DMA_FROM_DEVICE);
+ dma_sync_single_for_device(h->dev, virt_to_dma(h, addr), size,
+ DMA_BIDIRECTIONAL);
}

struct Scsi_Host *
@@ -300,8 +307,8 @@ NCR_700_detect(struct scsi_host_template *tpnt,
memory = dma_alloc_coherent(dev, TOTAL_MEM_SIZE, &pScript, GFP_KERNEL);
if (!memory) {
hostdata->noncoherent = 1;
- memory = dma_alloc_attrs(dev, TOTAL_MEM_SIZE, &pScript,
- GFP_KERNEL, DMA_ATTR_NON_CONSISTENT);
+ memory = dma_alloc_noncoherent(dev, TOTAL_MEM_SIZE, &pScript,
+ DMA_BIDIRECTIONAL, GFP_KERNEL);
}
if (!memory) {
printk(KERN_ERR "53c700: Failed to allocate memory for driver, detaching\n");
@@ -414,8 +421,9 @@ NCR_700_release(struct Scsi_Host *host)
(struct NCR_700_Host_Parameters *)host->hostdata[0];

if (hostdata->noncoherent)
- dma_free_attrs(hostdata->dev, TOTAL_MEM_SIZE, hostdata->script,
- hostdata->pScript, DMA_ATTR_NON_CONSISTENT);
+ dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
+ hostdata->script, hostdata->pScript,
+ DMA_BIDIRECTIONAL);
else
dma_free_coherent(hostdata->dev, TOTAL_MEM_SIZE,
hostdata->script, hostdata->pScript);
--
2.28.0
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