[Skiboot] [PATCH 21/24] Add "cleanup_global_tlb" for P9 and later

[Benjamin Herrenschmidt]

Uses broadcast TLBIE's to cleanup the TLB on all cores and on
the nest MMU

Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
---
 asm/misc.S        | 41 +++++++++++++++++++++++++++++++++++++++++
 include/skiboot.h |  1 +
 2 files changed, 42 insertions(+)

diff --git a/asm/misc.S b/asm/misc.S
index 4c9eee9..d8745c8 100644
--- a/asm/misc.S
+++ b/asm/misc.S
@@ -63,3 +63,44 @@ cleanup_local_tlb:
 	bdnz	1b
 	ptesync
 	blr
+
+	.global cleanup_global_tlb
+cleanup_global_tlb:
+
+	/* Only supported on P9 for now */
+	mfspr	%r3,SPR_PVR
+	srdi	%r3,%r3,16
+	cmpwi	cr0,%r3,PVR_TYPE_P9
+	bnelr
+
+	/* Sync out previous updates */
+	ptesync
+
+	.machine "power9"
+
+	/* Lead RB with IS=11 */
+	li	%r3,3
+	sldi	%r3,%r3,10
+	li	%r0,0
+
+	/* Blow up radix partition scoped translations */
+	tlbie	%r3, %r0 /* rs */, 2 /* ric */, 1 /* prs */, 1 /* r */
+	eieio
+	tlbsync
+	ptesync
+	tlbie	%r3, %r0 /* rs */, 2 /* ric */, 0 /* prs */, 1 /* r */
+	eieio
+	tlbsync
+	ptesync
+
+	/* Blow up hash partition scoped translations */
+	tlbie	%r3, %r0 /* rs */, 2 /* ric */, 1 /* prs */, 0 /* r */
+	eieio
+	tlbsync
+	ptesync
+	tlbie	%r3, %r0 /* rs */, 2 /* ric */, 0 /* prs */, 0 /* r */
+	eieio
+	tlbsync
+	ptesync
+
+	blr
diff --git a/include/skiboot.h b/include/skiboot.h
index 87d8503..1a153b0 100644
--- a/include/skiboot.h
+++ b/include/skiboot.h
@@ -204,6 +204,7 @@ extern void fast_reboot(void);
 extern void __noreturn __secondary_cpu_entry(void);
 extern void __noreturn load_and_boot_kernel(bool is_reboot);
 extern void cleanup_local_tlb(void);
+extern void cleanup_global_tlb(void);
 extern void init_shared_sprs(void);
 extern void init_replicated_sprs(void);
 extern bool start_preload_kernel(void);
-- 
2.9.4