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Diffstat (limited to 'arch/powerpc/kernel/machine_kexec_64.c')
-rw-r--r--arch/powerpc/kernel/machine_kexec_64.c75
1 files changed, 23 insertions, 52 deletions
diff --git a/arch/powerpc/kernel/machine_kexec_64.c b/arch/powerpc/kernel/machine_kexec_64.c
index 4c780a342282..a205fa3d9bf3 100644
--- a/arch/powerpc/kernel/machine_kexec_64.c
+++ b/arch/powerpc/kernel/machine_kexec_64.c
@@ -23,6 +23,7 @@
#include <asm/current.h>
#include <asm/machdep.h>
#include <asm/cacheflush.h>
+#include <asm/firmware.h>
#include <asm/paca.h>
#include <asm/mmu.h>
#include <asm/sections.h> /* _end */
@@ -31,21 +32,6 @@
#include <asm/hw_breakpoint.h>
#include <asm/asm-prototypes.h>
-#ifdef CONFIG_PPC_BOOK3E
-int default_machine_kexec_prepare(struct kimage *image)
-{
- int i;
- /*
- * Since we use the kernel fault handlers and paging code to
- * handle the virtual mode, we must make sure no destination
- * overlaps kernel static data or bss.
- */
- for (i = 0; i < image->nr_segments; i++)
- if (image->segment[i].mem < __pa(_end))
- return -ETXTBSY;
- return 0;
-}
-#else
int default_machine_kexec_prepare(struct kimage *image)
{
int i;
@@ -55,9 +41,6 @@ int default_machine_kexec_prepare(struct kimage *image)
const unsigned long *basep;
const unsigned int *sizep;
- if (!mmu_hash_ops.hpte_clear_all)
- return -ENOENT;
-
/*
* Since we use the kernel fault handlers and paging code to
* handle the virtual mode, we must make sure no destination
@@ -67,31 +50,6 @@ int default_machine_kexec_prepare(struct kimage *image)
if (image->segment[i].mem < __pa(_end))
return -ETXTBSY;
- /*
- * For non-LPAR, we absolutely can not overwrite the mmu hash
- * table, since we are still using the bolted entries in it to
- * do the copy. Check that here.
- *
- * It is safe if the end is below the start of the blocked
- * region (end <= low), or if the beginning is after the
- * end of the blocked region (begin >= high). Use the
- * boolean identity !(a || b) === (!a && !b).
- */
-#ifdef CONFIG_PPC_STD_MMU_64
- if (htab_address) {
- low = __pa(htab_address);
- high = low + htab_size_bytes;
-
- for (i = 0; i < image->nr_segments; i++) {
- begin = image->segment[i].mem;
- end = begin + image->segment[i].memsz;
-
- if ((begin < high) && (end > low))
- return -ETXTBSY;
- }
- }
-#endif /* CONFIG_PPC_STD_MMU_64 */
-
/* We also should not overwrite the tce tables */
for_each_node_by_type(node, "pci") {
basep = of_get_property(node, "linux,tce-base", NULL);
@@ -113,7 +71,6 @@ int default_machine_kexec_prepare(struct kimage *image)
return 0;
}
-#endif /* !CONFIG_PPC_BOOK3E */
static void copy_segments(unsigned long ind)
{
@@ -332,11 +289,14 @@ struct paca_struct kexec_paca;
/* Our assembly helper, in misc_64.S */
extern void kexec_sequence(void *newstack, unsigned long start,
void *image, void *control,
- void (*clear_all)(void)) __noreturn;
+ void (*clear_all)(void),
+ bool copy_with_mmu_off) __noreturn;
/* too late to fail here */
void default_machine_kexec(struct kimage *image)
{
+ bool copy_with_mmu_off;
+
/* prepare control code if any */
/*
@@ -374,18 +334,29 @@ void default_machine_kexec(struct kimage *image)
/* XXX: If anyone does 'dynamic lppacas' this will also need to be
* switched to a static version!
*/
+ /*
+ * On Book3S, the copy must happen with the MMU off if we are either
+ * using Radix page tables or we are not in an LPAR since we can
+ * overwrite the page tables while copying.
+ *
+ * In an LPAR, we keep the MMU on otherwise we can't access beyond
+ * the RMA. On BookE there is no real MMU off mode, so we have to
+ * keep it enabled as well (but then we have bolted TLB entries).
+ */
+#ifdef CONFIG_PPC_BOOK3E
+ copy_with_mmu_off = false;
+#else
+ copy_with_mmu_off = radix_enabled() ||
+ !(firmware_has_feature(FW_FEATURE_LPAR) ||
+ firmware_has_feature(FW_FEATURE_PS3_LV1));
+#endif
/* Some things are best done in assembly. Finding globals with
* a toc is easier in C, so pass in what we can.
*/
kexec_sequence(&kexec_stack, image->start, image,
- page_address(image->control_code_page),
-#ifdef CONFIG_PPC_STD_MMU
- mmu_hash_ops.hpte_clear_all
-#else
- NULL
-#endif
- );
+ page_address(image->control_code_page),
+ mmu_cleanup_all, copy_with_mmu_off);
/* NOTREACHED */
}