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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-12-18 14:13:29 -0500
committerPaul Mackerras <paulus@samba.org>2008-12-20 22:21:15 -0500
commit2ca8cf738907180e7fbda90f25f32b86feda609f (patch)
tree60d8af9b53a78ae9300ef7e68f222b02fe3be542 /arch/powerpc/include/asm
parent5e696617c425eb97bd943d781f3941fb1e8f0e5b (diff)
powerpc/mm: Rework context management for CPUs with no hash table
This reworks the context management code used by 4xx,8xx and freescale BookE. It adds support for SMP by implementing a concept of stale context map to lazily flush the TLB on processors where a context may have been invalidated. This also contains the ground work for generalizing such lazy TLB flushing by just picking up a new PID and marking the old one stale. This will be implemented later. This is a first implementation that uses a global spinlock. Ideally, we should try to get at least the fast path (context ID already assigned) lockless or limited to a per context lock, but for now this will do. I tried to keep the UP case reasonably simple to avoid adding too much overhead to 8xx which does a lot of context stealing since it effectively has only 16 PIDs available. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/include/asm')
-rw-r--r--arch/powerpc/include/asm/mmu-40x.h5
-rw-r--r--arch/powerpc/include/asm/mmu-44x.h5
-rw-r--r--arch/powerpc/include/asm/mmu-8xx.h3
-rw-r--r--arch/powerpc/include/asm/mmu-fsl-booke.h5
-rw-r--r--arch/powerpc/include/asm/tlbflush.h2
5 files changed, 13 insertions, 7 deletions
diff --git a/arch/powerpc/include/asm/mmu-40x.h b/arch/powerpc/include/asm/mmu-40x.h
index 3d108676584c..776f415a36aa 100644
--- a/arch/powerpc/include/asm/mmu-40x.h
+++ b/arch/powerpc/include/asm/mmu-40x.h
@@ -54,8 +54,9 @@
54#ifndef __ASSEMBLY__ 54#ifndef __ASSEMBLY__
55 55
56typedef struct { 56typedef struct {
57 unsigned long id; 57 unsigned int id;
58 unsigned long vdso_base; 58 unsigned int active;
59 unsigned long vdso_base;
59} mm_context_t; 60} mm_context_t;
60 61
61#endif /* !__ASSEMBLY__ */ 62#endif /* !__ASSEMBLY__ */
diff --git a/arch/powerpc/include/asm/mmu-44x.h b/arch/powerpc/include/asm/mmu-44x.h
index a825524c981a..b21af32ac6d6 100644
--- a/arch/powerpc/include/asm/mmu-44x.h
+++ b/arch/powerpc/include/asm/mmu-44x.h
@@ -56,8 +56,9 @@
56extern unsigned int tlb_44x_hwater; 56extern unsigned int tlb_44x_hwater;
57 57
58typedef struct { 58typedef struct {
59 unsigned long id; 59 unsigned int id;
60 unsigned long vdso_base; 60 unsigned int active;
61 unsigned long vdso_base;
61} mm_context_t; 62} mm_context_t;
62 63
63#endif /* !__ASSEMBLY__ */ 64#endif /* !__ASSEMBLY__ */
diff --git a/arch/powerpc/include/asm/mmu-8xx.h b/arch/powerpc/include/asm/mmu-8xx.h
index 9db877eb88db..07865a357848 100644
--- a/arch/powerpc/include/asm/mmu-8xx.h
+++ b/arch/powerpc/include/asm/mmu-8xx.h
@@ -137,7 +137,8 @@
137 137
138#ifndef __ASSEMBLY__ 138#ifndef __ASSEMBLY__
139typedef struct { 139typedef struct {
140 unsigned long id; 140 unsigned int id;
141 unsigned int active;
141 unsigned long vdso_base; 142 unsigned long vdso_base;
142} mm_context_t; 143} mm_context_t;
143#endif /* !__ASSEMBLY__ */ 144#endif /* !__ASSEMBLY__ */
diff --git a/arch/powerpc/include/asm/mmu-fsl-booke.h b/arch/powerpc/include/asm/mmu-fsl-booke.h
index 5588a41f439c..3f941c0f7e8e 100644
--- a/arch/powerpc/include/asm/mmu-fsl-booke.h
+++ b/arch/powerpc/include/asm/mmu-fsl-booke.h
@@ -76,8 +76,9 @@
76#ifndef __ASSEMBLY__ 76#ifndef __ASSEMBLY__
77 77
78typedef struct { 78typedef struct {
79 unsigned long id; 79 unsigned int id;
80 unsigned long vdso_base; 80 unsigned int active;
81 unsigned long vdso_base;
81} mm_context_t; 82} mm_context_t;
82#endif /* !__ASSEMBLY__ */ 83#endif /* !__ASSEMBLY__ */
83 84
diff --git a/arch/powerpc/include/asm/tlbflush.h b/arch/powerpc/include/asm/tlbflush.h
index 333c24b54379..9ed363d3de44 100644
--- a/arch/powerpc/include/asm/tlbflush.h
+++ b/arch/powerpc/include/asm/tlbflush.h
@@ -29,6 +29,8 @@
29 29
30#include <linux/mm.h> 30#include <linux/mm.h>
31 31
32#define MMU_NO_CONTEXT ((unsigned int)-1)
33
32extern void _tlbie(unsigned long address, unsigned int pid); 34extern void _tlbie(unsigned long address, unsigned int pid);
33extern void _tlbil_all(void); 35extern void _tlbil_all(void);
34extern void _tlbil_pid(unsigned int pid); 36extern void _tlbil_pid(unsigned int pid);