linux-kernel - [PATCH v5 10/10] vring: Add a module parameter to force-enable the DMA API

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Date:	Thu, 28 Jan 2016 18:31:23 -0800
From:	Andy Lutomirski <luto@...nel.org>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Woodhouse <dwmw2@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	sparclinux@...r.kernel.org, Joerg Roedel <jroedel@...e.de>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Christoph Hellwig <hch@....de>, KVM <kvm@...r.kernel.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-s390 <linux-s390@...r.kernel.org>,
	Linux Virtualization <virtualization@...ts.linux-foundation.org>,
	David Vrabel <david.vrabel@...rix.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	xen-devel@...ts.xenproject.org, Andy Lutomirski <luto@...nel.org>
Subject: [PATCH v5 10/10] vring: Add a module parameter to force-enable the DMA API

This will be useful for testing.

Signed-off-by: Andy Lutomirski <luto@...nel.org>
---
 drivers/virtio/virtio_ring.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 305c05cc249a..46fb77d824e9 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -45,6 +45,10 @@
  * API.
  */
 
+static bool force_dma_api = false;
+module_param(force_dma_api, bool, 0644);
+MODULE_PARM_DESC(force_dma_api, "force-enable the DMA API");
+
 static bool vring_use_dma_api(void)
 {
 #if defined(CONFIG_X86) && defined(CONFIG_XEN)
@@ -59,7 +63,7 @@ static bool vring_use_dma_api(void)
 	return static_cpu_has(X86_FEATURE_XENPV);
 #endif
 
-	return false;
+	return force_dma_api;
 }
 
 #ifdef DEBUG
-- 
2.5.0