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From: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
To: joro@8bytes.org, mst@redhat.com
Cc: virtio-dev@lists.oasis-open.org, kevin.tian@intel.com,
	Lorenzo.Pieralisi@arm.com, tnowicki@caviumnetworks.com,
	frowand.list@gmail.com, devicetree@vger.kernel.org,
	linux-pci@vger.kernel.org, jasowang@redhat.com,
	virtualization@lists.linux-foundation.org,
	iommu@lists.linux-foundation.org, robh+dt@kernel.org,
	bhelgaas@google.com, robin.murphy@arm.com,
	kvmarm@lists.cs.columbia.edu, bauerman@linux.ibm.com
Subject: [PATCH v8 3/7] of: Allow the iommu-map property to omit untranslated devices
Date: Thu, 30 May 2019 18:09:25 +0100
Message-ID: <20190530170929.19366-4-jean-philippe.brucker@arm.com> (raw)
In-Reply-To: <20190530170929.19366-1-jean-philippe.brucker@arm.com>

In PCI root complex nodes, the iommu-map property describes the IOMMU that
translates each endpoint. On some platforms, the IOMMU itself is presented
as a PCI endpoint (e.g. AMD IOMMU and virtio-iommu). This isn't supported
by the current OF driver, which expects all endpoints to have an IOMMU.
Allow the iommu-map property to have gaps.

Relaxing of_map_rid() also allows the msi-map property to have gaps, which
is invalid since MSIs always reach an MSI controller. In that case
pci_msi_setup_msi_irqs() will return an error when attempting to find the
device's MSI domain.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
---
 drivers/of/base.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 20e0e7ee4edf..55e7f5bb0549 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2294,8 +2294,12 @@ int of_map_rid(struct device_node *np, u32 rid,
 		return 0;
 	}
 
-	pr_err("%pOF: Invalid %s translation - no match for rid 0x%x on %pOF\n",
-		np, map_name, rid, target && *target ? *target : NULL);
-	return -EFAULT;
+	pr_info("%pOF: no %s translation for rid 0x%x on %pOF\n", np, map_name,
+		rid, target && *target ? *target : NULL);
+
+	/* Bypasses translation */
+	if (id_out)
+		*id_out = rid;
+	return 0;
 }
 EXPORT_SYMBOL_GPL(of_map_rid);
-- 
2.21.0

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  parent reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-30 17:09 [PATCH v8 0/7] Add virtio-iommu driver Jean-Philippe Brucker
2019-05-30 17:09 ` [PATCH v8 1/7] dt-bindings: virtio-mmio: Add IOMMU description Jean-Philippe Brucker
2019-05-30 17:09 ` [PATCH v8 2/7] dt-bindings: virtio: Add virtio-pci-iommu node Jean-Philippe Brucker
2019-05-30 17:45   ` Michael S. Tsirkin
2019-05-31 11:13     ` [virtio-dev] " Jean-Philippe Brucker
2019-06-16 20:04       ` Michael S. Tsirkin
2019-05-30 17:09 ` Jean-Philippe Brucker [this message]
2019-05-30 17:09 ` [PATCH v8 4/7] PCI: OF: Initialize dev->fwnode appropriately Jean-Philippe Brucker
2019-05-30 17:09 ` [PATCH v8 5/7] iommu: Add virtio-iommu driver Jean-Philippe Brucker
2019-06-14  7:33   ` Auger Eric
2019-05-30 17:09 ` [PATCH v8 6/7] iommu/virtio: Add probe request Jean-Philippe Brucker
2019-05-30 17:09 ` [PATCH v8 7/7] iommu/virtio: Add event queue Jean-Philippe Brucker
2019-06-13 15:54 ` [PATCH v8 0/7] Add virtio-iommu driver Auger Eric

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