diff mbox

[V9,07/11] iommu: of: Handle IOMMU lookup failure with deferred probing or error

Message ID 1489086061-9356-8-git-send-email-sricharan@codeaurora.org (mailing list archive)
State New, archived
Headers show

Commit Message

Sricharan Ramabadhran March 9, 2017, 7 p.m. UTC
From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

Failures to look up an IOMMU when parsing the DT iommus property need to
be handled separately from the .of_xlate() failures to support deferred
probing.

The lack of a registered IOMMU can be caused by the lack of a driver for
the IOMMU, the IOMMU device probe not having been performed yet, having
been deferred, or having failed.

The first case occurs when the device tree describes the bus master and
IOMMU topology correctly but no device driver exists for the IOMMU yet
or the device driver has not been compiled in. Return NULL, the caller
will configure the device without an IOMMU.

The second and third cases are handled by deferring the probe of the bus
master device which will eventually get reprobed after the IOMMU.

The last case is currently handled by deferring the probe of the bus
master device as well. A mechanism to either configure the bus master
device without an IOMMU or to fail the bus master device probe depending
on whether the IOMMU is optional or mandatory would be a good
enhancement.

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Laurent Pichart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
---
 drivers/base/dma-mapping.c | 5 +++--
 drivers/iommu/of_iommu.c   | 4 ++--
 drivers/of/device.c        | 7 ++++++-
 include/linux/of_device.h  | 9 ++++++---
 4 files changed, 17 insertions(+), 8 deletions(-)

Comments

Rob Herring (Arm) March 28, 2017, 3 p.m. UTC | #1
On Fri, Mar 10, 2017 at 12:30:57AM +0530, Sricharan R wrote:
> From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> 
> Failures to look up an IOMMU when parsing the DT iommus property need to
> be handled separately from the .of_xlate() failures to support deferred
> probing.
> 
> The lack of a registered IOMMU can be caused by the lack of a driver for
> the IOMMU, the IOMMU device probe not having been performed yet, having
> been deferred, or having failed.
> 
> The first case occurs when the device tree describes the bus master and
> IOMMU topology correctly but no device driver exists for the IOMMU yet
> or the device driver has not been compiled in. Return NULL, the caller
> will configure the device without an IOMMU.
> 
> The second and third cases are handled by deferring the probe of the bus
> master device which will eventually get reprobed after the IOMMU.
> 
> The last case is currently handled by deferring the probe of the bus
> master device as well. A mechanism to either configure the bus master
> device without an IOMMU or to fail the bus master device probe depending
> on whether the IOMMU is optional or mandatory would be a good
> enhancement.
> 
> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Signed-off-by: Laurent Pichart <laurent.pinchart+renesas@ideasonboard.com>
> Signed-off-by: Sricharan R <sricharan@codeaurora.org>
> ---
>  drivers/base/dma-mapping.c | 5 +++--
>  drivers/iommu/of_iommu.c   | 4 ++--
>  drivers/of/device.c        | 7 ++++++-
>  include/linux/of_device.h  | 9 ++++++---
>  4 files changed, 17 insertions(+), 8 deletions(-)

Maybe it is the same issue reported for VFIO, but virtio-pci is broken 
with v8 of this series. Bisecting blames this commit which looks like it 
hasn't changeed. 

Rob

P.S. Doesn't look like you have copied the DT maintainers nor list for 
the DT changes.
Robin Murphy March 28, 2017, 3:11 p.m. UTC | #2
On 28/03/17 16:00, Rob Herring wrote:
> On Fri, Mar 10, 2017 at 12:30:57AM +0530, Sricharan R wrote:
>> From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
>>
>> Failures to look up an IOMMU when parsing the DT iommus property need to
>> be handled separately from the .of_xlate() failures to support deferred
>> probing.
>>
>> The lack of a registered IOMMU can be caused by the lack of a driver for
>> the IOMMU, the IOMMU device probe not having been performed yet, having
>> been deferred, or having failed.
>>
>> The first case occurs when the device tree describes the bus master and
>> IOMMU topology correctly but no device driver exists for the IOMMU yet
>> or the device driver has not been compiled in. Return NULL, the caller
>> will configure the device without an IOMMU.
>>
>> The second and third cases are handled by deferring the probe of the bus
>> master device which will eventually get reprobed after the IOMMU.
>>
>> The last case is currently handled by deferring the probe of the bus
>> master device as well. A mechanism to either configure the bus master
>> device without an IOMMU or to fail the bus master device probe depending
>> on whether the IOMMU is optional or mandatory would be a good
>> enhancement.
>>
>> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
>> Signed-off-by: Laurent Pichart <laurent.pinchart+renesas@ideasonboard.com>
>> Signed-off-by: Sricharan R <sricharan@codeaurora.org>
>> ---
>>  drivers/base/dma-mapping.c | 5 +++--
>>  drivers/iommu/of_iommu.c   | 4 ++--
>>  drivers/of/device.c        | 7 ++++++-
>>  include/linux/of_device.h  | 9 ++++++---
>>  4 files changed, 17 insertions(+), 8 deletions(-)
> 
> Maybe it is the same issue reported for VFIO, but virtio-pci is broken 
> with v8 of this series. Bisecting blames this commit which looks like it 
> hasn't changeed. 

v8 managed to break *all* PCI devices which didn't have an associated
"iommu-map". The problem was actually in patch 2 (and is fixed in this
version), but it only hit at this point once we start propagating the
erroneous error code back to the driver probe.

Robin.

> 
> Rob
> 
> P.S. Doesn't look like you have copied the DT maintainers nor list for 
> the DT changes.
>
Sricharan Ramabadhran March 28, 2017, 4:06 p.m. UTC | #3
Hi,

On 3/28/2017 8:30 PM, Rob Herring wrote:
> On Fri, Mar 10, 2017 at 12:30:57AM +0530, Sricharan R wrote:
>> From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
>>
>> Failures to look up an IOMMU when parsing the DT iommus property need to
>> be handled separately from the .of_xlate() failures to support deferred
>> probing.
>>
>> The lack of a registered IOMMU can be caused by the lack of a driver for
>> the IOMMU, the IOMMU device probe not having been performed yet, having
>> been deferred, or having failed.
>>
>> The first case occurs when the device tree describes the bus master and
>> IOMMU topology correctly but no device driver exists for the IOMMU yet
>> or the device driver has not been compiled in. Return NULL, the caller
>> will configure the device without an IOMMU.
>>
>> The second and third cases are handled by deferring the probe of the bus
>> master device which will eventually get reprobed after the IOMMU.
>>
>> The last case is currently handled by deferring the probe of the bus
>> master device as well. A mechanism to either configure the bus master
>> device without an IOMMU or to fail the bus master device probe depending
>> on whether the IOMMU is optional or mandatory would be a good
>> enhancement.
>>
>> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
>> Signed-off-by: Laurent Pichart <laurent.pinchart+renesas@ideasonboard.com>
>> Signed-off-by: Sricharan R <sricharan@codeaurora.org>
>> ---
>>  drivers/base/dma-mapping.c | 5 +++--
>>  drivers/iommu/of_iommu.c   | 4 ++--
>>  drivers/of/device.c        | 7 ++++++-
>>  include/linux/of_device.h  | 9 ++++++---
>>  4 files changed, 17 insertions(+), 8 deletions(-)
>
> Maybe it is the same issue reported for VFIO, but virtio-pci is broken
> with v8 of this series. Bisecting blames this commit which looks like it
> hasn't changeed.

Ya, as Robin mentioned it was broken at patch #2 and
comes out after this patch. I am going to repost this series with
couple of more fixes added as well.

>
> Rob
>
> P.S. Doesn't look like you have copied the DT maintainers nor list for
> the DT changes.

Ha, really sorry about that. will add it.

Regards,
  Sricharan
diff mbox

Patch

diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
index 449b948..82bd45c 100644
--- a/drivers/base/dma-mapping.c
+++ b/drivers/base/dma-mapping.c
@@ -353,6 +353,7 @@  int dma_configure(struct device *dev)
 {
 	struct device *bridge = NULL, *dma_dev = dev;
 	enum dev_dma_attr attr;
+	int ret = 0;
 
 	if (dev_is_pci(dev)) {
 		bridge = pci_get_host_bridge_device(to_pci_dev(dev));
@@ -363,7 +364,7 @@  int dma_configure(struct device *dev)
 	}
 
 	if (dma_dev->of_node) {
-		of_dma_configure(dev, dma_dev->of_node);
+		ret = of_dma_configure(dev, dma_dev->of_node);
 	} else if (has_acpi_companion(dma_dev)) {
 		attr = acpi_get_dma_attr(to_acpi_device_node(dma_dev->fwnode));
 		if (attr != DEV_DMA_NOT_SUPPORTED)
@@ -373,7 +374,7 @@  int dma_configure(struct device *dev)
 	if (bridge)
 		pci_put_host_bridge_device(bridge);
 
-	return 0;
+	return ret;
 }
 
 void dma_deconfigure(struct device *dev)
diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index c8be889..9f44ee8 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -236,7 +236,7 @@  const struct iommu_ops *of_iommu_configure(struct device *dev,
 			ops = ERR_PTR(err);
 	}
 
-	return IS_ERR(ops) ? NULL : ops;
+	return ops;
 }
 
 static int __init of_iommu_init(void)
@@ -247,7 +247,7 @@  static int __init of_iommu_init(void)
 	for_each_matching_node_and_match(np, matches, &match) {
 		const of_iommu_init_fn init_fn = match->data;
 
-		if (init_fn(np))
+		if (init_fn && init_fn(np))
 			pr_err("Failed to initialise IOMMU %s\n",
 				of_node_full_name(np));
 	}
diff --git a/drivers/of/device.c b/drivers/of/device.c
index c17c19d..ba51ca6 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -82,7 +82,7 @@  int of_device_add(struct platform_device *ofdev)
  * can use a platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE events
  * to fix up DMA configuration.
  */
-void of_dma_configure(struct device *dev, struct device_node *np)
+int of_dma_configure(struct device *dev, struct device_node *np)
 {
 	u64 dma_addr, paddr, size;
 	int ret;
@@ -129,10 +129,15 @@  void of_dma_configure(struct device *dev, struct device_node *np)
 		coherent ? " " : " not ");
 
 	iommu = of_iommu_configure(dev, np);
+	if (IS_ERR(iommu))
+		return PTR_ERR(iommu);
+
 	dev_dbg(dev, "device is%sbehind an iommu\n",
 		iommu ? " " : " not ");
 
 	arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent);
+
+	return 0;
 }
 EXPORT_SYMBOL_GPL(of_dma_configure);
 
diff --git a/include/linux/of_device.h b/include/linux/of_device.h
index af98455..2cacdd8 100644
--- a/include/linux/of_device.h
+++ b/include/linux/of_device.h
@@ -55,7 +55,7 @@  static inline struct device_node *of_cpu_device_node_get(int cpu)
 	return of_node_get(cpu_dev->of_node);
 }
 
-void of_dma_configure(struct device *dev, struct device_node *np);
+int of_dma_configure(struct device *dev, struct device_node *np);
 void of_dma_deconfigure(struct device *dev);
 #else /* CONFIG_OF */
 
@@ -104,8 +104,11 @@  static inline struct device_node *of_cpu_device_node_get(int cpu)
 {
 	return NULL;
 }
-static inline void of_dma_configure(struct device *dev, struct device_node *np)
-{}
+
+static inline int of_dma_configure(struct device *dev, struct device_node *np)
+{
+	return 0;
+}
 static inline void of_dma_deconfigure(struct device *dev)
 {}
 #endif /* CONFIG_OF */