[POWERPC] Check cache coherency of kernel vs firmware

check_cache_coherency() verifies that the cache coherency setting of
the kernel (CONFIG_NOT_COHERENT_CACHE) matches that left by the firmware,
as indicated by coherency-off device tree property.

Signed-off-by: Dale Farnsworth <dale@farnsworth.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 3708037..ed07a19 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -530,3 +530,44 @@ void __init setup_panic(void)
 {
 	atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 }
+
+#ifdef CONFIG_CHECK_CACHE_COHERENCY
+/*
+ * For platforms that have configurable cache-coherency.  This function
+ * checks that the cache coherency setting of the kernel matches the setting
+ * left by the firmware, as indicated in the device tree.  Since a mismatch
+ * will eventually result in DMA failures, we print * and error and call
+ * BUG() in that case.
+ */
+
+#ifdef CONFIG_NOT_COHERENT_CACHE
+#define KERNEL_COHERENCY	0
+#else
+#define KERNEL_COHERENCY	1
+#endif
+
+static int __init check_cache_coherency(void)
+{
+	struct device_node *np;
+	const void *prop;
+	int devtree_coherency;
+
+	np = of_find_node_by_path("/");
+	prop = of_get_property(np, "coherency-off", NULL);
+	of_node_put(np);
+
+	devtree_coherency = prop ? 0 : 1;
+
+	if (devtree_coherency != KERNEL_COHERENCY) {
+		printk(KERN_ERR
+			"kernel coherency:%s != device tree_coherency:%s\n",
+			KERNEL_COHERENCY ? "on" : "off",
+			devtree_coherency ? "on" : "off");
+		BUG();
+	}
+
+	return 0;
+}
+
+late_initcall(check_cache_coherency);
+#endif /* CONFIG_CHECK_CACHE_COHERENCY */