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From: Dave Jiang <dave.jiang@intel.com>
To: vkoul@kernel.org
Cc: dmaengine@vger.kernel.org
Subject: [PATCH] dmaengine: idxd: add module parameter to force disable of SVA
Date: Fri, 15 Jan 2021 15:01:50 -0700	[thread overview]
Message-ID: <161074811013.2184257.13335125853932003159.stgit@djiang5-desk3.ch.intel.com> (raw)

Add a module parameter that overrides the SVA feature enabling. This keeps
the driver in legacy mode even when intel_iommu=sm_on is set. In this mode,
the descriptor fields must be programmed with dma_addr_t from the Linux DMA
API for source, destination, and completion descriptors.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
 drivers/dma/idxd/init.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
index 25cc947c6179..9687a24ff982 100644
--- a/drivers/dma/idxd/init.c
+++ b/drivers/dma/idxd/init.c
@@ -26,6 +26,10 @@ MODULE_VERSION(IDXD_DRIVER_VERSION);
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Intel Corporation");
 
+static bool sva = true;
+module_param(sva, bool, 0644);
+MODULE_PARM_DESC(sva, "Toggle SVA support on/off");
+
 #define DRV_NAME "idxd"
 
 bool support_enqcmd;
@@ -338,12 +342,14 @@ static int idxd_probe(struct idxd_device *idxd)
 	idxd_device_init_reset(idxd);
 	dev_dbg(dev, "IDXD reset complete\n");
 
-	if (IS_ENABLED(CONFIG_INTEL_IDXD_SVM)) {
+	if (IS_ENABLED(CONFIG_INTEL_IDXD_SVM) && sva) {
 		rc = idxd_enable_system_pasid(idxd);
 		if (rc < 0)
 			dev_warn(dev, "Failed to enable PASID. No SVA support: %d\n", rc);
 		else
 			set_bit(IDXD_FLAG_PASID_ENABLED, &idxd->flags);
+	} else if (!sva) {
+		dev_warn(dev, "User forced SVA off via module param.\n");
 	}
 
 	idxd_read_caps(idxd);



             reply	other threads:[~2021-01-15 22:02 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-15 22:01 Dave Jiang [this message]
2021-01-17  6:51 ` [PATCH] dmaengine: idxd: add module parameter to force disable of SVA Vinod Koul
2021-01-18 17:06   ` Dave Jiang
2021-01-19 16:38     ` Vinod Koul
2021-01-19 19:44       ` Dave Jiang
2021-01-26 17:02         ` Vinod Koul

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