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From: Sricharan R <sricharan@codeaurora.org>
To: robin.murphy@arm.com, will.deacon@arm.com, joro@8bytes.org,
	lorenzo.pieralisi@arm.com, iommu@lists.linux-foundation.org,
	linux-arm-kernel@lists.infradead.org,
	linux-arm-msm@vger.kernel.org, m.szyprowski@samsung.com,
	bhelgaas@google.com, linux-pci@vger.kernel.org,
	linux-acpi@vger.kernel.org, tn@semihalf.com,
	hanjun.guo@linaro.org, okaya@codeaurora.org, robh+dt@kernel.org,
	frowand.list@gmail.com, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, sudeep.holla@arm.com,
	rjw@rjwysocki.net, lenb@kernel.org, catalin.marinas@arm.com,
	arnd@arndb.de, linux-arch@vger.kernel.org,
	laurent.pinchart@ideasonboard.com, j.neuschaefer@gmx.net,
	geert@linux-m68k.org, magnus.damm@gmail.com,
	nwatters@codeaurora.org
Cc: sricharan@codeaurora.org
Subject: [PATCH v5 1/5] iommu: of: Fix check for returning EPROBE_DEFER
Date: Tue, 23 May 2017 18:31:29 +0530	[thread overview]
Message-ID: <1495544493-14219-1-git-send-email-sricharan@codeaurora.org> (raw)

Now with IOMMU probe deferral, we return -EPROBE_DEFER
for masters that are connected to an IOMMU which is not
probed yet, but going to get probed, so that we can attach
the correct dma_ops. So while trying to defer the probe of
the master, check if the of_iommu node that it is connected
to is marked in DT as 'status=disabled', then the IOMMU is never
is going to get probed. So simply return NULL and let the master
work without an IOMMU.

Fixes: 7b07cbefb68d ("iommu: of: Handle IOMMU lookup failure with deferred probing or error")
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Will Deacon <will.deacon@arm.com>
Tested-by: Magnus Damn <magnus.damn@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
---
 drivers/iommu/of_iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index 9f44ee8..e6e9bec 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -118,6 +118,7 @@ static bool of_iommu_driver_present(struct device_node *np)
 
 	ops = iommu_ops_from_fwnode(fwnode);
 	if ((ops && !ops->of_xlate) ||
+	    !of_device_is_available(iommu_spec->np) ||
 	    (!ops && !of_iommu_driver_present(iommu_spec->np)))
 		return NULL;
 
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

WARNING: multiple messages have this Message-ID (diff)
From: Sricharan R <sricharan@codeaurora.org>
To: robin.murphy@arm.com, will.deacon@arm.com, joro@8bytes.org,
	lorenzo.pieralisi@arm.com, iommu@lists.linux-foundation.org,
	linux-arm-kernel@lists.infradead.org,
	linux-arm-msm@vger.kernel.org, m.szyprowski@samsung.com,
	bhelgaas@google.com, linux-pci@vger.kernel.org,
	linux-acpi@vger.kernel.org, tn@semihalf.com,
	hanjun.guo@linaro.org, okaya@codeaurora.org, robh+dt@kernel.org,
	frowand.list@gmail.com, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, sudeep.holla@arm.com,
	rjw@rjwysocki.net, lenb@kernel.org, catalin.marinas@arm.com,
	arnd@arndb.de, linux-arch@vger.kernel.org,
	laurent.pinchart@ideasonboard.com, j.neuschaefer@gmx.net,
	geert@linux-m68k.org, magnus.damm@gmail.com,
	nwatters@codeaurora.org
Cc: sricharan@codeaurora.org
Subject: [PATCH v5 1/5] iommu: of: Fix check for returning EPROBE_DEFER
Date: Tue, 23 May 2017 18:31:29 +0530	[thread overview]
Message-ID: <1495544493-14219-1-git-send-email-sricharan@codeaurora.org> (raw)

Now with IOMMU probe deferral, we return -EPROBE_DEFER
for masters that are connected to an IOMMU which is not
probed yet, but going to get probed, so that we can attach
the correct dma_ops. So while trying to defer the probe of
the master, check if the of_iommu node that it is connected
to is marked in DT as 'status=disabled', then the IOMMU is never
is going to get probed. So simply return NULL and let the master
work without an IOMMU.

Fixes: 7b07cbefb68d ("iommu: of: Handle IOMMU lookup failure with deferred probing or error")
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Will Deacon <will.deacon@arm.com>
Tested-by: Magnus Damn <magnus.damn@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
---
 drivers/iommu/of_iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index 9f44ee8..e6e9bec 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -118,6 +118,7 @@ static bool of_iommu_driver_present(struct device_node *np)
 
 	ops = iommu_ops_from_fwnode(fwnode);
 	if ((ops && !ops->of_xlate) ||
+	    !of_device_is_available(iommu_spec->np) ||
 	    (!ops && !of_iommu_driver_present(iommu_spec->np)))
 		return NULL;
 
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation


_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: sricharan@codeaurora.org (Sricharan R)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v5 1/5] iommu: of: Fix check for returning EPROBE_DEFER
Date: Tue, 23 May 2017 18:31:29 +0530	[thread overview]
Message-ID: <1495544493-14219-1-git-send-email-sricharan@codeaurora.org> (raw)

Now with IOMMU probe deferral, we return -EPROBE_DEFER
for masters that are connected to an IOMMU which is not
probed yet, but going to get probed, so that we can attach
the correct dma_ops. So while trying to defer the probe of
the master, check if the of_iommu node that it is connected
to is marked in DT as 'status=disabled', then the IOMMU is never
is going to get probed. So simply return NULL and let the master
work without an IOMMU.

Fixes: 7b07cbefb68d ("iommu: of: Handle IOMMU lookup failure with deferred probing or error")
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Will Deacon <will.deacon@arm.com>
Tested-by: Magnus Damn <magnus.damn@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
---
 drivers/iommu/of_iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index 9f44ee8..e6e9bec 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -118,6 +118,7 @@ static bool of_iommu_driver_present(struct device_node *np)
 
 	ops = iommu_ops_from_fwnode(fwnode);
 	if ((ops && !ops->of_xlate) ||
+	    !of_device_is_available(iommu_spec->np) ||
 	    (!ops && !of_iommu_driver_present(iommu_spec->np)))
 		return NULL;
 
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

             reply	other threads:[~2017-05-23 13:01 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-23 13:01 Sricharan R [this message]
2017-05-23 13:01 ` [PATCH v5 1/5] iommu: of: Fix check for returning EPROBE_DEFER Sricharan R
2017-05-23 13:01 ` Sricharan R
     [not found] ` <1495544493-14219-1-git-send-email-sricharan-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2017-05-23 13:01   ` [PATCH v5 2/5] iommu: of: Ignore all errors except EPROBE_DEFER Sricharan R
2017-05-23 13:01     ` Sricharan R
2017-05-23 13:01     ` Sricharan R
2017-05-23 13:01     ` Sricharan R
2017-05-23 13:01   ` [PATCH v5 3/5] ACPI/IORT: " Sricharan R
2017-05-23 13:01     ` Sricharan R
2017-05-23 13:01     ` Sricharan R
2017-05-23 13:01     ` Sricharan R
2017-05-23 13:01   ` [PATCH v5 4/5] ARM: dma-mapping: Don't tear third-party mappings Sricharan R
2017-05-23 13:01     ` Sricharan R
2017-05-23 13:01     ` Sricharan R
2017-05-23 13:01     ` Sricharan R
2017-05-23 13:01   ` [PATCH v5 5/5] ACPI/IORT: Move the check to get iommu_ops from translated fwspec Sricharan R
2017-05-23 13:01     ` Sricharan R
2017-05-23 13:01     ` Sricharan R
2017-05-23 13:01     ` Sricharan R
2017-05-30  9:27   ` [PATCH v5 1/5] iommu: of: Fix check for returning EPROBE_DEFER Joerg Roedel
2017-05-30  9:27     ` Joerg Roedel
2017-05-30  9:27     ` Joerg Roedel
2017-05-30  9:27     ` Joerg Roedel

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