powerpc/cell: Fixed IOMMU mapping uses weak ordering for a pcie endpoint

At the moment the fixed mapping is by default strongly ordered (the
iommu_fixed=weak boot option must be used to make the fixed mapping weakly
ordered). If we're on a setup where the southbridge is being used in
endpoint mode (triblade and CAB boards) the default should be a weakly
ordered fixed mapping.

This adds a check so that if a node of type pcie-endpoint can be found in
the device tree the fixed mapping is set to be weak by default (but can be
overridden using iommu_fixed=strong).

Signed-off-by: Mark Nelson <markn@au1.ibm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 12 insertions, 1 deletions

diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c
index 208005ca262..031124a8e37 100644
--- a/arch/powerpc/platforms/cell/iommu.c
+++ b/arch/powerpc/platforms/cell/iommu.c
@@ -1150,12 +1150,23 @@ static int iommu_fixed_disabled;
 
 static int __init setup_iommu_fixed(char *str)
 {
+        struct device_node *pciep;
+
         if (strcmp(str, "off") == 0)
                 iommu_fixed_disabled = 1;
 
-        else if (strcmp(str, "weak") == 0)
+        /* If we can find a pcie-endpoint in the device tree assume that
+         * we're on a triblade or a CAB so by default the fixed mapping
+         * should be set to be weakly ordered; but only if the boot
+         * option WASN'T set for strong ordering
+         */
+        pciep = of_find_node_by_type(NULL, "pcie-endpoint");
+
+        if (strcmp(str, "weak") == 0 || (pciep && strcmp(str, "strong") != 0))
                 iommu_fixed_is_weak = 1;
 
+        of_node_put(pciep);
+
         return 1;
 }
 __setup("iommu_fixed=", setup_iommu_fixed);