linux-kernel - [PATCH 06/29] drivers: iommu: add notify about failed bind

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Date:	Tue, 05 Aug 2014 12:47:34 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	iommu@...ts.linux-foundation.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	linaro-mm-sig@...ts.linaro.org, Arnd Bergmann <arnd@...db.de>,
	Shaik Ameer Basha <shaik.ameer@...sung.com>,
	Cho KyongHo <pullip.cho@...sung.com>,
	Joerg Roedel <joro@...tes.org>,
	Thierry Reding <treding@...dia.com>,
	Olof Johansson <olof@...om.net>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Rob Herring <robh@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Inki Dae <inki.dae@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: [PATCH 06/29] drivers: iommu: add notify about failed bind

This patch adds support for forwarding recently introduced
BUS_NOTIFY_DRVBIND_FAILED event to iommu groups. This lets us getting a
notify for failed device driver bind, so all the items done in
IOMMU_GROUP_NOTIFY_BIND_DRIVER event can be cleaned if the driver fails
to bind.

Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
---
 drivers/iommu/iommu.c | 3 +++
 include/linux/iommu.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 1698360..516e93a 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -758,6 +758,9 @@ static int iommu_bus_notifier(struct notifier_block *nb,
 	case BUS_NOTIFY_UNBOUND_DRIVER:
 		group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER;
 		break;
+	case BUS_NOTIFY_DRVBIND_FAILED:
+		group_action = IOMMU_GROUP_NOTIFY_DRVBIND_FAILED;
+		break;
 	}
 
 	if (group_action)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 20f9a52..f9fdae5 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -139,6 +139,7 @@ struct iommu_ops {
 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER		4 /* Post Driver bind */
 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER	5 /* Pre Driver unbind */
 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER	6 /* Post Driver unbind */
+#define IOMMU_GROUP_NOTIFY_DRVBIND_FAILED	7 /* Driver failed to bind */
 
 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
 extern bool iommu_present(struct bus_type *bus);
-- 
1.9.2

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