[POWERPC] DART iommu suspend
This implements save and restore hooks for IOMMUs and implements
it the DART iommu.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/sysdev/dart_iommu.c b/arch/powerpc/sysdev/dart_iommu.c
index 336186d..a1d2042 100644
--- a/arch/powerpc/sysdev/dart_iommu.c
+++ b/arch/powerpc/sysdev/dart_iommu.c
@@ -36,6 +36,7 @@
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/vmalloc.h>
+#include <linux/suspend.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/iommu.h>
@@ -54,6 +55,9 @@
/* Virtual base address of the DART table */
static u32 *dart_vbase;
+#ifdef CONFIG_PM
+static u32 *dart_copy;
+#endif
/* Mapped base address for the dart */
static unsigned int __iomem *dart;
@@ -346,6 +350,48 @@
set_pci_dma_ops(&dma_direct_ops);
}
+#ifdef CONFIG_PM
+static void iommu_dart_save(void)
+{
+ memcpy(dart_copy, dart_vbase, 2*1024*1024);
+}
+
+static void iommu_dart_restore(void)
+{
+ memcpy(dart_vbase, dart_copy, 2*1024*1024);
+ dart_tlb_invalidate_all();
+}
+
+static int __init iommu_init_late_dart(void)
+{
+ unsigned long tbasepfn;
+ struct page *p;
+
+ /* if no dart table exists then we won't need to save it
+ * and the area has also not been reserved */
+ if (!dart_tablebase)
+ return 0;
+
+ tbasepfn = __pa(dart_tablebase) >> PAGE_SHIFT;
+ register_nosave_region_late(tbasepfn,
+ tbasepfn + ((1<<24) >> PAGE_SHIFT));
+
+ /* For suspend we need to copy the dart contents because
+ * it is not part of the regular mapping (see above) and
+ * thus not saved automatically. The memory for this copy
+ * must be allocated early because we need 2 MB. */
+ p = alloc_pages(GFP_KERNEL, 21 - PAGE_SHIFT);
+ BUG_ON(!p);
+ dart_copy = page_address(p);
+
+ ppc_md.iommu_save = iommu_dart_save;
+ ppc_md.iommu_restore = iommu_dart_restore;
+
+ return 0;
+}
+
+late_initcall(iommu_init_late_dart);
+#endif
void __init alloc_dart_table(void)
{
