Thread (3 messages) flat view 3 messages, 3 authors, 2017-02-03
STALE3520d

[PATCH] crypto: ccp: Fix DMA operations when IOMMU is enabled

From: Gary R Hook <hidden>
Date: 2017-01-27 21:28:57
Subsystem: amd cryptographic coprocessor (ccp) driver, crypto api, the rest · Maintainers: Tom Lendacky, John Allen, Herbert Xu, "David S. Miller", Linus Torvalds

An I/O page fault occurs when the IOMMU is enabled on a
system that supports the v5 CCP.  DMA operations use a
Request ID value that does not match what is expected by
the IOMMU, resulting in the I/O page fault.  Setting the
Request ID value to 0 corrects this issue.

Signed-off-by: Gary R Hook <redacted>
---
 drivers/crypto/ccp/ccp-dev-v5.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/crypto/ccp/ccp-dev-v5.c b/drivers/crypto/ccp/ccp-dev-v5.c
index e2ce819..612898b 100644
--- a/drivers/crypto/ccp/ccp-dev-v5.c
+++ b/drivers/crypto/ccp/ccp-dev-v5.c
@@ -959,7 +959,7 @@ static irqreturn_t ccp5_irq_handler(int irq, void *data)
 static void ccp5_config(struct ccp_device *ccp)
 {
 	/* Public side */
-	iowrite32(0x00001249, ccp->io_regs + CMD5_REQID_CONFIG_OFFSET);
+	iowrite32(0x0, ccp->io_regs + CMD5_REQID_CONFIG_OFFSET);
 }
 
 static void ccp5other_config(struct ccp_device *ccp)
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