linux-kernel - Re: [PATCH 4/7] iommu: Add driver-not-bound notification

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Date:   Fri, 9 Jun 2017 16:43:34 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     kvm@...r.kernel.org, eric.auger@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/7] iommu: Add driver-not-bound notification

On Sat, 10 Jun 2017 00:21:33 +0200
Joerg Roedel <joro@...tes.org> wrote:

> On Fri, Jun 09, 2017 at 03:59:59PM -0600, Alex Williamson wrote:
> > The driver core supports a BUS_NOTIFY_DRIVER_NOT_BOUND notification
> > sent if a driver fails to bind to a device.  Extend IOMMU group
> > notifications to include a version of this.
> > 
> > Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
> > Cc: Joerg Roedel <joro@...tes.org>  
> 
> Since this is part of a larger patch-set I assume it won't go through
> iommu-tree, so:
> 
> 	Acked-by: Joerg Roedel <jroedel@...e.de>
> 

Thanks Joerg!  Yes, I was hoping for your ack so I could pull it
through the vfio tree.  I also note that I added a new case, but missed
the break.  It doesn't change the code, but I think it makes it more
maintainable to include it.  If there are no objections I'll make this
trivial update to the commit:

commit 95c30f6a55638edaf9673f451c0050441cf18ab8
Author: Alex Williamson <alex.williamson@...hat.com>
Date:   Sat Jun 3 13:00:06 2017 -0600

    iommu: Add driver-not-bound notification
    
    The driver core supports a BUS_NOTIFY_DRIVER_NOT_BOUND notification
    sent if a driver fails to bind to a device.  Extend IOMMU group
    notifications to include a version of this.
    
    Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
    Acked-by: Joerg Roedel <jroedel@...e.de>

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 3b67144dead2..7043f95ee43d 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1113,6 +1113,9 @@ 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_DRIVER_NOT_BOUND:
+		group_action = IOMMU_GROUP_NOTIFY_DRIVER_NOT_BOUND;
+		break;
 	}
 
 	if (group_action)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 2e4de0deee53..54a0eb96da25 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -268,6 +268,7 @@ static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
 #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_DRIVER_NOT_BOUND	7 /* Driver bind failed */
 
 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
 extern bool iommu_present(struct bus_type *bus);