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From:   Diana Craciun <diana.craciun@oss.nxp.com>
To:     alex.williamson@redhat.com, kvm@vger.kernel.org
Cc:     linux-kernel@vger.kernel.org, bharatb.linux@gmail.com,
        laurentiu.tudor@nxp.com, Diana Craciun <diana.craciun@oss.nxp.com>
Subject: [PATCH v4 10/10] vfio/fsl-mc: Add support for device reset
Date:   Wed, 26 Aug 2020 12:33:15 +0300
Message-Id: <20200826093315.5279-11-diana.craciun@oss.nxp.com>
In-Reply-To: <20200826093315.5279-1-diana.craciun@oss.nxp.com>
References: <20200826093315.5279-1-diana.craciun@oss.nxp.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Currently only resetting the DPRC container is supported which
will reset all the objects inside it. Resetting individual
objects is possible from the userspace by issueing commands
towards MC firmware.

Signed-off-by: Diana Craciun <diana.craciun@oss.nxp.com>
---
 drivers/vfio/fsl-mc/vfio_fsl_mc.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
index 27713aa86878..d17c5b3148ad 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
@@ -310,7 +310,20 @@ static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
 	}
 	case VFIO_DEVICE_RESET:
 	{
-		return -ENOTTY;
+		int ret = 0;
+
+		struct fsl_mc_device *mc_dev = vdev->mc_dev;
+
+		/* reset is supported only for the DPRC */
+		if (!is_fsl_mc_bus_dprc(mc_dev))
+			return -ENOTTY;
+
+		ret = dprc_reset_container(mc_dev->mc_io, 0,
+					   mc_dev->mc_handle,
+					   mc_dev->obj_desc.id,
+					   DPRC_RESET_OPTION_NON_RECURSIVE);
+		return ret;
+
 	}
 	default:
 		return -ENOTTY;
-- 
2.17.1