From 81c2f79c2104c5b48f01da674bc2f7d4bc600db4 Mon Sep 17 00:00:00 2001

From: Dave Jiang <dave.jiang@intel.com>

Date: Tue, 3 Aug 2021 15:32:06 -0700

Subject: [PATCH] dmaengine: idxd: add capability check for 'block on fault' attribute

Git-commit: 81c2f79c2104c5b48f01da674bc2f7d4bc600db4

Patch-mainline: v5.15-rc1

References: jsc#SLE-18899

The device general capability has a bit that indicate whether 'block on

fault' is supported. Add check to wq sysfs knob to check if cap exists

before allowing user to toggle.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>

Link: https://lore.kernel.org/r/162802992615.3084999.12539468940404102898.stgit@djiang5-desk3.ch.intel.com

Signed-off-by: Vinod Koul <vkoul@kernel.org>

Acked-by: Takashi Iwai <tiwai@suse.de>

---

 drivers/dma/idxd/sysfs.c | 3 +++

 1 file changed, 3 insertions(+)

diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c

index 4c01587c9d4a..a88886d0f27b 100644

--- a/drivers/dma/idxd/sysfs.c

+++ b/drivers/dma/idxd/sysfs.c

@@ -642,6 +642,9 @@ static ssize_t wq_block_on_fault_store(struct device *dev,

 	bool bof;

 	int rc;

+	if (!idxd->hw.gen_cap.block_on_fault)

+		return -EOPNOTSUPP;

+

 	if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))

 		return -EPERM;

-- 

2.26.2