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[POWERPC] DART iommu suspend

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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>
This commit is contained in:
Johannes Berg 2007-05-03 22:28:32 +10:00 committed by Paul Mackerras
parent 55b61fec22
commit 7e11580b36
3 changed files with 65 additions and 0 deletions
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46
arch/powerpc/sysdev/dart_iommu.c
View file

@ -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 @@ static unsigned long dart_tablesize;
/* 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 @@ void iommu_init_early_dart(void)
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)
{

14
include/asm-powerpc/iommu.h
View file

@ -26,6 +26,7 @@
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <asm/machdep.h>
#include <asm/types.h>
#include <asm/bitops.h>
@ -109,6 +110,19 @@ static inline void pci_iommu_init(void) { }
#endif
extern void alloc_dart_table(void);
#if defined(CONFIG_PPC64) && defined(CONFIG_PM)
static inline void iommu_save(void)
{
if (ppc_md.iommu_save)
ppc_md.iommu_save();
}
static inline void iommu_restore(void)
{
if (ppc_md.iommu_restore)
ppc_md.iommu_restore();
}
#endif
#endif /* __KERNEL__ */
#endif /* _ASM_IOMMU_H */

5
include/asm-powerpc/machdep.h
View file

@ -91,6 +91,11 @@ struct machdep_calls {
void __iomem * (*ioremap)(phys_addr_t addr, unsigned long size,
unsigned long flags);
void (*iounmap)(volatile void __iomem *token);
#ifdef CONFIG_PM
void (*iommu_save)(void);
void (*iommu_restore)(void);
#endif
#endif /* CONFIG_PPC64 */
int (*probe)(void);