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-rw-r--r--arch/s390/kernel/early.c16
-rw-r--r--arch/s390/kernel/head64.S2
-rw-r--r--arch/s390/kernel/setup.c10
-rw-r--r--arch/s390/mm/Makefile2
-rw-r--r--arch/s390/mm/fault.c3
-rw-r--r--arch/s390/mm/hugetlbpage.c134
-rw-r--r--arch/s390/mm/init.c23
-rw-r--r--arch/s390/mm/vmem.c55
-rw-r--r--fs/Kconfig3
-rw-r--r--include/asm-s390/hugetlb.h183
-rw-r--r--include/asm-s390/page.h29
-rw-r--r--include/asm-s390/pgtable.h12
-rw-r--r--include/asm-s390/setup.h6
-rw-r--r--include/asm-s390/tlbflush.h1
14 files changed, 437 insertions, 42 deletions
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index bd188f6bd0e2..d0e09684b9ce 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -268,6 +268,19 @@ static noinline __init void setup_lowcore_early(void)
268 s390_base_pgm_handler_fn = early_pgm_check_handler; 268 s390_base_pgm_handler_fn = early_pgm_check_handler;
269} 269}
270 270
271static noinline __init void setup_hpage(void)
272{
273#ifndef CONFIG_DEBUG_PAGEALLOC
274 unsigned int facilities;
275
276 facilities = stfl();
277 if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29)))
278 return;
279 machine_flags |= MACHINE_FLAG_HPAGE;
280 __ctl_set_bit(0, 23);
281#endif
282}
283
271static __init void detect_mvpg(void) 284static __init void detect_mvpg(void)
272{ 285{
273#ifndef CONFIG_64BIT 286#ifndef CONFIG_64BIT
@@ -360,6 +373,8 @@ static __init void detect_machine_facilities(void)
360 facilities = stfl(); 373 facilities = stfl();
361 if (facilities & (1 << 28)) 374 if (facilities & (1 << 28))
362 machine_flags |= MACHINE_FLAG_IDTE; 375 machine_flags |= MACHINE_FLAG_IDTE;
376 if (facilities & (1 << 23))
377 machine_flags |= MACHINE_FLAG_PFMF;
363 if (facilities & (1 << 4)) 378 if (facilities & (1 << 4))
364 machine_flags |= MACHINE_FLAG_MVCOS; 379 machine_flags |= MACHINE_FLAG_MVCOS;
365#endif 380#endif
@@ -388,6 +403,7 @@ void __init startup_init(void)
388 detect_diag9c(); 403 detect_diag9c();
389 detect_diag44(); 404 detect_diag44();
390 detect_machine_facilities(); 405 detect_machine_facilities();
406 setup_hpage();
391 sclp_read_info_early(); 407 sclp_read_info_early();
392 sclp_facilities_detect(); 408 sclp_facilities_detect();
393 memsize = sclp_memory_detect(); 409 memsize = sclp_memory_detect();
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index 9c2c6f7d37e7..1d06961e87b3 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -129,7 +129,7 @@ startup_continue:
129 # virtual and never return ... 129 # virtual and never return ...
130 .align 16 130 .align 16
131.Lentry:.quad 0x0000000180000000,_stext 131.Lentry:.quad 0x0000000180000000,_stext
132.Lctl: .quad 0x04b50002 # cr0: various things 132.Lctl: .quad 0x04350002 # cr0: various things
133 .quad 0 # cr1: primary space segment table 133 .quad 0 # cr1: primary space segment table
134 .quad .Lduct # cr2: dispatchable unit control table 134 .quad .Lduct # cr2: dispatchable unit control table
135 .quad 0 # cr3: instruction authorization 135 .quad 0 # cr3: instruction authorization
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 694c6546ce64..2bc70b6e876a 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -749,6 +749,9 @@ static void __init setup_hwcaps(void)
749 elf_hwcap |= 1UL << 6; 749 elf_hwcap |= 1UL << 6;
750 } 750 }
751 751
752 if (MACHINE_HAS_HPAGE)
753 elf_hwcap |= 1UL << 7;
754
752 switch (cpuinfo->cpu_id.machine) { 755 switch (cpuinfo->cpu_id.machine) {
753 case 0x9672: 756 case 0x9672:
754#if !defined(CONFIG_64BIT) 757#if !defined(CONFIG_64BIT)
@@ -872,8 +875,9 @@ void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
872 875
873static int show_cpuinfo(struct seq_file *m, void *v) 876static int show_cpuinfo(struct seq_file *m, void *v)
874{ 877{
875 static const char *hwcap_str[7] = { 878 static const char *hwcap_str[8] = {
876 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp" 879 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
880 "edat"
877 }; 881 };
878 struct cpuinfo_S390 *cpuinfo; 882 struct cpuinfo_S390 *cpuinfo;
879 unsigned long n = (unsigned long) v - 1; 883 unsigned long n = (unsigned long) v - 1;
@@ -888,7 +892,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
888 num_online_cpus(), loops_per_jiffy/(500000/HZ), 892 num_online_cpus(), loops_per_jiffy/(500000/HZ),
889 (loops_per_jiffy/(5000/HZ))%100); 893 (loops_per_jiffy/(5000/HZ))%100);
890 seq_puts(m, "features\t: "); 894 seq_puts(m, "features\t: ");
891 for (i = 0; i < 7; i++) 895 for (i = 0; i < 8; i++)
892 if (hwcap_str[i] && (elf_hwcap & (1UL << i))) 896 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
893 seq_printf(m, "%s ", hwcap_str[i]); 897 seq_printf(m, "%s ", hwcap_str[i]);
894 seq_puts(m, "\n"); 898 seq_puts(m, "\n");
diff --git a/arch/s390/mm/Makefile b/arch/s390/mm/Makefile
index 66401930f83e..fb988a48a754 100644
--- a/arch/s390/mm/Makefile
+++ b/arch/s390/mm/Makefile
@@ -4,4 +4,4 @@
4 4
5obj-y := init.o fault.o extmem.o mmap.o vmem.o pgtable.o 5obj-y := init.o fault.o extmem.o mmap.o vmem.o pgtable.o
6obj-$(CONFIG_CMM) += cmm.o 6obj-$(CONFIG_CMM) += cmm.o
7 7obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 2650f46001d0..4d537205e83c 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -28,6 +28,7 @@
28#include <linux/hardirq.h> 28#include <linux/hardirq.h>
29#include <linux/kprobes.h> 29#include <linux/kprobes.h>
30#include <linux/uaccess.h> 30#include <linux/uaccess.h>
31#include <linux/hugetlb.h>
31#include <asm/system.h> 32#include <asm/system.h>
32#include <asm/pgtable.h> 33#include <asm/pgtable.h>
33#include <asm/s390_ext.h> 34#include <asm/s390_ext.h>
@@ -367,6 +368,8 @@ good_area:
367 } 368 }
368 369
369survive: 370survive:
371 if (is_vm_hugetlb_page(vma))
372 address &= HPAGE_MASK;
370 /* 373 /*
371 * If for any reason at all we couldn't handle the fault, 374 * If for any reason at all we couldn't handle the fault,
372 * make sure we exit gracefully rather than endlessly redo 375 * make sure we exit gracefully rather than endlessly redo
diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
new file mode 100644
index 000000000000..f4b6124fdb75
--- /dev/null
+++ b/arch/s390/mm/hugetlbpage.c
@@ -0,0 +1,134 @@
1/*
2 * IBM System z Huge TLB Page Support for Kernel.
3 *
4 * Copyright 2007 IBM Corp.
5 * Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
6 */
7
8#include <linux/mm.h>
9#include <linux/hugetlb.h>
10
11
12void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
13 pte_t *pteptr, pte_t pteval)
14{
15 pmd_t *pmdp = (pmd_t *) pteptr;
16 pte_t shadow_pteval = pteval;
17 unsigned long mask;
18
19 if (!MACHINE_HAS_HPAGE) {
20 pteptr = (pte_t *) pte_page(pteval)[1].index;
21 mask = pte_val(pteval) &
22 (_SEGMENT_ENTRY_INV | _SEGMENT_ENTRY_RO);
23 pte_val(pteval) = (_SEGMENT_ENTRY + __pa(pteptr)) | mask;
24 if (mm->context.noexec) {
25 pteptr += PTRS_PER_PTE;
26 pte_val(shadow_pteval) =
27 (_SEGMENT_ENTRY + __pa(pteptr)) | mask;
28 }
29 }
30
31 pmd_val(*pmdp) = pte_val(pteval);
32 if (mm->context.noexec) {
33 pmdp = get_shadow_table(pmdp);
34 pmd_val(*pmdp) = pte_val(shadow_pteval);
35 }
36}
37
38int arch_prepare_hugepage(struct page *page)
39{
40 unsigned long addr = page_to_phys(page);
41 pte_t pte;
42 pte_t *ptep;
43 int i;
44
45 if (MACHINE_HAS_HPAGE)
46 return 0;
47
48 ptep = (pte_t *) pte_alloc_one(&init_mm, address);
49 if (!ptep)
50 return -ENOMEM;
51
52 pte = mk_pte(page, PAGE_RW);
53 for (i = 0; i < PTRS_PER_PTE; i++) {
54 set_pte_at(&init_mm, addr + i * PAGE_SIZE, ptep + i, pte);
55 pte_val(pte) += PAGE_SIZE;
56 }
57 page[1].index = (unsigned long) ptep;
58 return 0;
59}
60
61void arch_release_hugepage(struct page *page)
62{
63 pte_t *ptep;
64
65 if (MACHINE_HAS_HPAGE)
66 return;
67
68 ptep = (pte_t *) page[1].index;
69 if (!ptep)
70 return;
71 pte_free(&init_mm, ptep);
72 page[1].index = 0;
73}
74
75pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
76{
77 pgd_t *pgdp;
78 pud_t *pudp;
79 pmd_t *pmdp = NULL;
80
81 pgdp = pgd_offset(mm, addr);
82 pudp = pud_alloc(mm, pgdp, addr);
83 if (pudp)
84 pmdp = pmd_alloc(mm, pudp, addr);
85 return (pte_t *) pmdp;
86}
87
88pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
89{
90 pgd_t *pgdp;
91 pud_t *pudp;
92 pmd_t *pmdp = NULL;
93
94 pgdp = pgd_offset(mm, addr);
95 if (pgd_present(*pgdp)) {
96 pudp = pud_offset(pgdp, addr);
97 if (pud_present(*pudp))
98 pmdp = pmd_offset(pudp, addr);
99 }
100 return (pte_t *) pmdp;
101}
102
103int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
104{
105 return 0;
106}
107
108struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
109 int write)
110{
111 return ERR_PTR(-EINVAL);
112}
113
114int pmd_huge(pmd_t pmd)
115{
116 if (!MACHINE_HAS_HPAGE)
117 return 0;
118
119 return !!(pmd_val(pmd) & _SEGMENT_ENTRY_LARGE);
120}
121
122struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
123 pmd_t *pmdp, int write)
124{
125 struct page *page;
126
127 if (!MACHINE_HAS_HPAGE)
128 return NULL;
129
130 page = pmd_page(*pmdp);
131 if (page)
132 page += ((address & ~HPAGE_MASK) >> PAGE_SHIFT);
133 return page;
134}
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 202c952a29b4..acc92f46a096 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -77,28 +77,6 @@ void show_mem(void)
77 printk("%lu pages pagetables\n", global_page_state(NR_PAGETABLE)); 77 printk("%lu pages pagetables\n", global_page_state(NR_PAGETABLE));
78} 78}
79 79
80static void __init setup_ro_region(void)
81{
82 pgd_t *pgd;
83 pud_t *pud;
84 pmd_t *pmd;
85 pte_t *pte;
86 pte_t new_pte;
87 unsigned long address, end;
88
89 address = ((unsigned long)&_stext) & PAGE_MASK;
90 end = PFN_ALIGN((unsigned long)&_eshared);
91
92 for (; address < end; address += PAGE_SIZE) {
93 pgd = pgd_offset_k(address);
94 pud = pud_offset(pgd, address);
95 pmd = pmd_offset(pud, address);
96 pte = pte_offset_kernel(pmd, address);
97 new_pte = mk_pte_phys(address, __pgprot(_PAGE_RO));
98 *pte = new_pte;
99 }
100}
101
102/* 80/*
103 * paging_init() sets up the page tables 81 * paging_init() sets up the page tables
104 */ 82 */
@@ -121,7 +99,6 @@ void __init paging_init(void)
121 clear_table((unsigned long *) init_mm.pgd, pgd_type, 99 clear_table((unsigned long *) init_mm.pgd, pgd_type,
122 sizeof(unsigned long)*2048); 100 sizeof(unsigned long)*2048);
123 vmem_map_init(); 101 vmem_map_init();
124 setup_ro_region();
125 102
126 /* enable virtual mapping in kernel mode */ 103 /* enable virtual mapping in kernel mode */
127 __ctl_load(S390_lowcore.kernel_asce, 1, 1); 104 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 3ffc0211dc85..97bce6c97574 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -10,10 +10,12 @@
10#include <linux/mm.h> 10#include <linux/mm.h>
11#include <linux/module.h> 11#include <linux/module.h>
12#include <linux/list.h> 12#include <linux/list.h>
13#include <linux/hugetlb.h>
13#include <asm/pgalloc.h> 14#include <asm/pgalloc.h>
14#include <asm/pgtable.h> 15#include <asm/pgtable.h>
15#include <asm/setup.h> 16#include <asm/setup.h>
16#include <asm/tlbflush.h> 17#include <asm/tlbflush.h>
18#include <asm/sections.h>
17 19
18static DEFINE_MUTEX(vmem_mutex); 20static DEFINE_MUTEX(vmem_mutex);
19 21
@@ -113,7 +115,7 @@ static pte_t __init_refok *vmem_pte_alloc(void)
113/* 115/*
114 * Add a physical memory range to the 1:1 mapping. 116 * Add a physical memory range to the 1:1 mapping.
115 */ 117 */
116static int vmem_add_range(unsigned long start, unsigned long size) 118static int vmem_add_range(unsigned long start, unsigned long size, int ro)
117{ 119{
118 unsigned long address; 120 unsigned long address;
119 pgd_t *pg_dir; 121 pgd_t *pg_dir;
@@ -140,7 +142,19 @@ static int vmem_add_range(unsigned long start, unsigned long size)
140 pud_populate_kernel(&init_mm, pu_dir, pm_dir); 142 pud_populate_kernel(&init_mm, pu_dir, pm_dir);
141 } 143 }
142 144
145 pte = mk_pte_phys(address, __pgprot(ro ? _PAGE_RO : 0));
143 pm_dir = pmd_offset(pu_dir, address); 146 pm_dir = pmd_offset(pu_dir, address);
147
148#ifdef __s390x__
149 if (MACHINE_HAS_HPAGE && !(address & ~HPAGE_MASK) &&
150 (address + HPAGE_SIZE <= start + size) &&
151 (address >= HPAGE_SIZE)) {
152 pte_val(pte) |= _SEGMENT_ENTRY_LARGE;
153 pmd_val(*pm_dir) = pte_val(pte);
154 address += HPAGE_SIZE - PAGE_SIZE;
155 continue;
156 }
157#endif
144 if (pmd_none(*pm_dir)) { 158 if (pmd_none(*pm_dir)) {
145 pt_dir = vmem_pte_alloc(); 159 pt_dir = vmem_pte_alloc();
146 if (!pt_dir) 160 if (!pt_dir)
@@ -149,7 +163,6 @@ static int vmem_add_range(unsigned long start, unsigned long size)
149 } 163 }
150 164
151 pt_dir = pte_offset_kernel(pm_dir, address); 165 pt_dir = pte_offset_kernel(pm_dir, address);
152 pte = pfn_pte(address >> PAGE_SHIFT, PAGE_KERNEL);
153 *pt_dir = pte; 166 *pt_dir = pte;
154 } 167 }
155 ret = 0; 168 ret = 0;
@@ -180,6 +193,13 @@ static void vmem_remove_range(unsigned long start, unsigned long size)
180 pm_dir = pmd_offset(pu_dir, address); 193 pm_dir = pmd_offset(pu_dir, address);
181 if (pmd_none(*pm_dir)) 194 if (pmd_none(*pm_dir))
182 continue; 195 continue;
196
197 if (pmd_huge(*pm_dir)) {
198 pmd_clear_kernel(pm_dir);
199 address += HPAGE_SIZE - PAGE_SIZE;
200 continue;
201 }
202
183 pt_dir = pte_offset_kernel(pm_dir, address); 203 pt_dir = pte_offset_kernel(pm_dir, address);
184 *pt_dir = pte; 204 *pt_dir = pte;
185 } 205 }
@@ -248,14 +268,14 @@ out:
248 return ret; 268 return ret;
249} 269}
250 270
251static int vmem_add_mem(unsigned long start, unsigned long size) 271static int vmem_add_mem(unsigned long start, unsigned long size, int ro)
252{ 272{
253 int ret; 273 int ret;
254 274
255 ret = vmem_add_mem_map(start, size); 275 ret = vmem_add_mem_map(start, size);
256 if (ret) 276 if (ret)
257 return ret; 277 return ret;
258 return vmem_add_range(start, size); 278 return vmem_add_range(start, size, ro);
259} 279}
260 280
261/* 281/*
@@ -338,7 +358,7 @@ int add_shared_memory(unsigned long start, unsigned long size)
338 if (ret) 358 if (ret)
339 goto out_free; 359 goto out_free;
340 360
341 ret = vmem_add_mem(start, size); 361 ret = vmem_add_mem(start, size, 0);
342 if (ret) 362 if (ret)
343 goto out_remove; 363 goto out_remove;
344 364
@@ -374,14 +394,35 @@ out:
374 */ 394 */
375void __init vmem_map_init(void) 395void __init vmem_map_init(void)
376{ 396{
397 unsigned long ro_start, ro_end;
398 unsigned long start, end;
377 int i; 399 int i;
378 400
379 INIT_LIST_HEAD(&init_mm.context.crst_list); 401 INIT_LIST_HEAD(&init_mm.context.crst_list);
380 INIT_LIST_HEAD(&init_mm.context.pgtable_list); 402 INIT_LIST_HEAD(&init_mm.context.pgtable_list);
381 init_mm.context.noexec = 0; 403 init_mm.context.noexec = 0;
382 NODE_DATA(0)->node_mem_map = VMEM_MAP; 404 NODE_DATA(0)->node_mem_map = VMEM_MAP;
383 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) 405 ro_start = ((unsigned long)&_stext) & PAGE_MASK;
384 vmem_add_mem(memory_chunk[i].addr, memory_chunk[i].size); 406 ro_end = PFN_ALIGN((unsigned long)&_eshared);
407 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
408 start = memory_chunk[i].addr;
409 end = memory_chunk[i].addr + memory_chunk[i].size;
410 if (start >= ro_end || end <= ro_start)
411 vmem_add_mem(start, end - start, 0);
412 else if (start >= ro_start && end <= ro_end)
413 vmem_add_mem(start, end - start, 1);
414 else if (start >= ro_start) {
415 vmem_add_mem(start, ro_end - start, 1);
416 vmem_add_mem(ro_end, end - ro_end, 0);
417 } else if (end < ro_end) {
418 vmem_add_mem(start, ro_start - start, 0);
419 vmem_add_mem(ro_start, end - ro_start, 1);
420 } else {
421 vmem_add_mem(start, ro_start - start, 0);
422 vmem_add_mem(ro_start, ro_end - ro_start, 1);
423 vmem_add_mem(ro_end, end - ro_end, 0);
424 }
425 }
385} 426}
386 427
387/* 428/*
diff --git a/fs/Kconfig b/fs/Kconfig
index 2e43d46f65d6..cf12c403b8c7 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -1005,7 +1005,8 @@ config TMPFS_POSIX_ACL
1005 1005
1006config HUGETLBFS 1006config HUGETLBFS
1007 bool "HugeTLB file system support" 1007 bool "HugeTLB file system support"
1008 depends on X86 || IA64 || PPC64 || SPARC64 || (SUPERH && MMU) || BROKEN 1008 depends on X86 || IA64 || PPC64 || SPARC64 || (SUPERH && MMU) || \
1009 (S390 && 64BIT) || BROKEN
1009 help 1010 help
1010 hugetlbfs is a filesystem backing for HugeTLB pages, based on 1011 hugetlbfs is a filesystem backing for HugeTLB pages, based on
1011 ramfs. For architectures that support it, say Y here and read 1012 ramfs. For architectures that support it, say Y here and read
diff --git a/include/asm-s390/hugetlb.h b/include/asm-s390/hugetlb.h
new file mode 100644
index 000000000000..600a776f8f75
--- /dev/null
+++ b/include/asm-s390/hugetlb.h
@@ -0,0 +1,183 @@
1/*
2 * IBM System z Huge TLB Page Support for Kernel.
3 *
4 * Copyright IBM Corp. 2008
5 * Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
6 */
7
8#ifndef _ASM_S390_HUGETLB_H
9#define _ASM_S390_HUGETLB_H
10
11#include <asm/page.h>
12#include <asm/pgtable.h>
13
14
15#define is_hugepage_only_range(mm, addr, len) 0
16#define hugetlb_free_pgd_range free_pgd_range
17
18void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
19 pte_t *ptep, pte_t pte);
20
21/*
22 * If the arch doesn't supply something else, assume that hugepage
23 * size aligned regions are ok without further preparation.
24 */
25static inline int prepare_hugepage_range(unsigned long addr, unsigned long len)
26{
27 if (len & ~HPAGE_MASK)
28 return -EINVAL;
29 if (addr & ~HPAGE_MASK)
30 return -EINVAL;
31 return 0;
32}
33
34#define hugetlb_prefault_arch_hook(mm) do { } while (0)
35
36int arch_prepare_hugepage(struct page *page);
37void arch_release_hugepage(struct page *page);
38
39static inline pte_t pte_mkhuge(pte_t pte)
40{
41 /*
42 * PROT_NONE needs to be remapped from the pte type to the ste type.
43 * The HW invalid bit is also different for pte and ste. The pte
44 * invalid bit happens to be the same as the ste _SEGMENT_ENTRY_LARGE
45 * bit, so we don't have to clear it.
46 */
47 if (pte_val(pte) & _PAGE_INVALID) {
48 if (pte_val(pte) & _PAGE_SWT)
49 pte_val(pte) |= _HPAGE_TYPE_NONE;
50 pte_val(pte) |= _SEGMENT_ENTRY_INV;
51 }
52 /*
53 * Clear SW pte bits SWT and SWX, there are no SW bits in a segment
54 * table entry.
55 */
56 pte_val(pte) &= ~(_PAGE_SWT | _PAGE_SWX);
57 /*
58 * Also set the change-override bit because we don't need dirty bit
59 * tracking for hugetlbfs pages.
60 */
61 pte_val(pte) |= (_SEGMENT_ENTRY_LARGE | _SEGMENT_ENTRY_CO);
62 return pte;
63}
64
65static inline pte_t huge_pte_wrprotect(pte_t pte)
66{
67 pte_val(pte) |= _PAGE_RO;
68 return pte;
69}
70
71static inline int huge_pte_none(pte_t pte)
72{
73 return (pte_val(pte) & _SEGMENT_ENTRY_INV) &&
74 !(pte_val(pte) & _SEGMENT_ENTRY_RO);
75}
76
77static inline pte_t huge_ptep_get(pte_t *ptep)
78{
79 pte_t pte = *ptep;
80 unsigned long mask;
81
82 if (!MACHINE_HAS_HPAGE) {
83 ptep = (pte_t *) (pte_val(pte) & _SEGMENT_ENTRY_ORIGIN);
84 if (ptep) {
85 mask = pte_val(pte) &
86 (_SEGMENT_ENTRY_INV | _SEGMENT_ENTRY_RO);
87 pte = pte_mkhuge(*ptep);
88 pte_val(pte) |= mask;
89 }
90 }
91 return pte;
92}
93
94static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
95 unsigned long addr, pte_t *ptep)
96{
97 pte_t pte = huge_ptep_get(ptep);
98
99 pmd_clear((pmd_t *) ptep);
100 return pte;
101}
102
103static inline void __pmd_csp(pmd_t *pmdp)
104{
105 register unsigned long reg2 asm("2") = pmd_val(*pmdp);
106 register unsigned long reg3 asm("3") = pmd_val(*pmdp) |
107 _SEGMENT_ENTRY_INV;
108 register unsigned long reg4 asm("4") = ((unsigned long) pmdp) + 5;
109
110 asm volatile(
111 " csp %1,%3"
112 : "=m" (*pmdp)
113 : "d" (reg2), "d" (reg3), "d" (reg4), "m" (*pmdp) : "cc");
114 pmd_val(*pmdp) = _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY;
115}
116
117static inline void __pmd_idte(unsigned long address, pmd_t *pmdp)
118{
119 unsigned long sto = (unsigned long) pmdp -
120 pmd_index(address) * sizeof(pmd_t);
121
122 if (!(pmd_val(*pmdp) & _SEGMENT_ENTRY_INV)) {
123 asm volatile(
124 " .insn rrf,0xb98e0000,%2,%3,0,0"
125 : "=m" (*pmdp)
126 : "m" (*pmdp), "a" (sto),
127 "a" ((address & HPAGE_MASK))
128 );
129 }
130 pmd_val(*pmdp) = _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY;
131}
132
133static inline void huge_ptep_invalidate(struct mm_struct *mm,
134 unsigned long address, pte_t *ptep)
135{
136 pmd_t *pmdp = (pmd_t *) ptep;
137
138 if (!MACHINE_HAS_IDTE) {
139 __pmd_csp(pmdp);
140 if (mm->context.noexec) {
141 pmdp = get_shadow_table(pmdp);
142 __pmd_csp(pmdp);
143 }
144 return;
145 }
146
147 __pmd_idte(address, pmdp);
148 if (mm->context.noexec) {
149 pmdp = get_shadow_table(pmdp);
150 __pmd_idte(address, pmdp);
151 }
152 return;
153}
154
155#define huge_ptep_set_access_flags(__vma, __addr, __ptep, __entry, __dirty) \
156({ \
157 int __changed = !pte_same(huge_ptep_get(__ptep), __entry); \
158 if (__changed) { \
159 huge_ptep_invalidate((__vma)->vm_mm, __addr, __ptep); \
160 set_huge_pte_at((__vma)->vm_mm, __addr, __ptep, __entry); \
161 } \
162 __changed; \
163})
164
165#define huge_ptep_set_wrprotect(__mm, __addr, __ptep) \
166({ \
167 pte_t __pte = huge_ptep_get(__ptep); \
168 if (pte_write(__pte)) { \
169 if (atomic_read(&(__mm)->mm_users) > 1 || \
170 (__mm) != current->active_mm) \
171 huge_ptep_invalidate(__mm, __addr, __ptep); \
172 set_huge_pte_at(__mm, __addr, __ptep, \
173 huge_pte_wrprotect(__pte)); \
174 } \
175})
176
177static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
178 unsigned long address, pte_t *ptep)
179{
180 huge_ptep_invalidate(vma->vm_mm, address, ptep);
181}
182
183#endif /* _ASM_S390_HUGETLB_H */
diff --git a/include/asm-s390/page.h b/include/asm-s390/page.h
index fe7f92b6ae6d..b01e6fc9a295 100644
--- a/include/asm-s390/page.h
+++ b/include/asm-s390/page.h
@@ -19,17 +19,34 @@
19#define PAGE_DEFAULT_ACC 0 19#define PAGE_DEFAULT_ACC 0
20#define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4) 20#define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4)
21 21
22#define HPAGE_SHIFT 20
23#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
24#define HPAGE_MASK (~(HPAGE_SIZE - 1))
25#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
26
27#define ARCH_HAS_SETCLEAR_HUGE_PTE
28#define ARCH_HAS_HUGE_PTE_TYPE
29#define ARCH_HAS_PREPARE_HUGEPAGE
30#define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH
31
22#include <asm/setup.h> 32#include <asm/setup.h>
23#ifndef __ASSEMBLY__ 33#ifndef __ASSEMBLY__
24 34
25static inline void clear_page(void *page) 35static inline void clear_page(void *page)
26{ 36{
27 register unsigned long reg1 asm ("1") = 0; 37 if (MACHINE_HAS_PFMF) {
28 register void *reg2 asm ("2") = page; 38 asm volatile(
29 register unsigned long reg3 asm ("3") = 4096; 39 " .insn rre,0xb9af0000,%0,%1"
30 asm volatile( 40 : : "d" (0x10000), "a" (page) : "memory", "cc");
31 " mvcl 2,0" 41 } else {
32 : "+d" (reg2), "+d" (reg3) : "d" (reg1) : "memory", "cc"); 42 register unsigned long reg1 asm ("1") = 0;
43 register void *reg2 asm ("2") = page;
44 register unsigned long reg3 asm ("3") = 4096;
45 asm volatile(
46 " mvcl 2,0"
47 : "+d" (reg2), "+d" (reg3) : "d" (reg1)
48 : "memory", "cc");
49 }
33} 50}
34 51
35static inline void copy_page(void *to, void *from) 52static inline void copy_page(void *to, void *from)
diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h
index f8347ce9c5a1..fd336f2e2a7a 100644
--- a/include/asm-s390/pgtable.h
+++ b/include/asm-s390/pgtable.h
@@ -234,6 +234,15 @@ extern char empty_zero_page[PAGE_SIZE];
234#define _PAGE_TYPE_EX_RW 0x002 234#define _PAGE_TYPE_EX_RW 0x002
235 235
236/* 236/*
237 * Only four types for huge pages, using the invalid bit and protection bit
238 * of a segment table entry.
239 */
240#define _HPAGE_TYPE_EMPTY 0x020 /* _SEGMENT_ENTRY_INV */
241#define _HPAGE_TYPE_NONE 0x220
242#define _HPAGE_TYPE_RO 0x200 /* _SEGMENT_ENTRY_RO */
243#define _HPAGE_TYPE_RW 0x000
244
245/*
237 * PTE type bits are rather complicated. handle_pte_fault uses pte_present, 246 * PTE type bits are rather complicated. handle_pte_fault uses pte_present,
238 * pte_none and pte_file to find out the pte type WITHOUT holding the page 247 * pte_none and pte_file to find out the pte type WITHOUT holding the page
239 * table lock. ptep_clear_flush on the other hand uses ptep_clear_flush to 248 * table lock. ptep_clear_flush on the other hand uses ptep_clear_flush to
@@ -325,6 +334,9 @@ extern char empty_zero_page[PAGE_SIZE];
325#define _SEGMENT_ENTRY (0) 334#define _SEGMENT_ENTRY (0)
326#define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INV) 335#define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INV)
327 336
337#define _SEGMENT_ENTRY_LARGE 0x400 /* STE-format control, large page */
338#define _SEGMENT_ENTRY_CO 0x100 /* change-recording override */
339
328#endif /* __s390x__ */ 340#endif /* __s390x__ */
329 341
330/* 342/*
diff --git a/include/asm-s390/setup.h b/include/asm-s390/setup.h
index 3a9e458fd8c3..ba69674012a7 100644
--- a/include/asm-s390/setup.h
+++ b/include/asm-s390/setup.h
@@ -69,6 +69,8 @@ extern unsigned long machine_flags;
69#define MACHINE_FLAG_DIAG9C (1UL << 7) 69#define MACHINE_FLAG_DIAG9C (1UL << 7)
70#define MACHINE_FLAG_MVCOS (1UL << 8) 70#define MACHINE_FLAG_MVCOS (1UL << 8)
71#define MACHINE_FLAG_KVM (1UL << 9) 71#define MACHINE_FLAG_KVM (1UL << 9)
72#define MACHINE_FLAG_HPAGE (1UL << 10)
73#define MACHINE_FLAG_PFMF (1UL << 11)
72 74
73#define MACHINE_IS_VM (machine_flags & MACHINE_FLAG_VM) 75#define MACHINE_IS_VM (machine_flags & MACHINE_FLAG_VM)
74#define MACHINE_IS_KVM (machine_flags & MACHINE_FLAG_KVM) 76#define MACHINE_IS_KVM (machine_flags & MACHINE_FLAG_KVM)
@@ -82,6 +84,8 @@ extern unsigned long machine_flags;
82#define MACHINE_HAS_DIAG44 (1) 84#define MACHINE_HAS_DIAG44 (1)
83#define MACHINE_HAS_MVPG (machine_flags & MACHINE_FLAG_MVPG) 85#define MACHINE_HAS_MVPG (machine_flags & MACHINE_FLAG_MVPG)
84#define MACHINE_HAS_MVCOS (0) 86#define MACHINE_HAS_MVCOS (0)
87#define MACHINE_HAS_HPAGE (0)
88#define MACHINE_HAS_PFMF (0)
85#else /* __s390x__ */ 89#else /* __s390x__ */
86#define MACHINE_HAS_IEEE (1) 90#define MACHINE_HAS_IEEE (1)
87#define MACHINE_HAS_CSP (1) 91#define MACHINE_HAS_CSP (1)
@@ -89,6 +93,8 @@ extern unsigned long machine_flags;
89#define MACHINE_HAS_DIAG44 (machine_flags & MACHINE_FLAG_DIAG44) 93#define MACHINE_HAS_DIAG44 (machine_flags & MACHINE_FLAG_DIAG44)
90#define MACHINE_HAS_MVPG (1) 94#define MACHINE_HAS_MVPG (1)
91#define MACHINE_HAS_MVCOS (machine_flags & MACHINE_FLAG_MVCOS) 95#define MACHINE_HAS_MVCOS (machine_flags & MACHINE_FLAG_MVCOS)
96#define MACHINE_HAS_HPAGE (machine_flags & MACHINE_FLAG_HPAGE)
97#define MACHINE_HAS_PFMF (machine_flags & MACHINE_FLAG_PFMF)
92#endif /* __s390x__ */ 98#endif /* __s390x__ */
93 99
94#define MACHINE_HAS_SCLP (!MACHINE_IS_P390) 100#define MACHINE_HAS_SCLP (!MACHINE_IS_P390)
diff --git a/include/asm-s390/tlbflush.h b/include/asm-s390/tlbflush.h
index 9e57a93d7de1..d60394b9745e 100644
--- a/include/asm-s390/tlbflush.h
+++ b/include/asm-s390/tlbflush.h
@@ -2,6 +2,7 @@
2#define _S390_TLBFLUSH_H 2#define _S390_TLBFLUSH_H
3 3
4#include <linux/mm.h> 4#include <linux/mm.h>
5#include <linux/sched.h>
5#include <asm/processor.h> 6#include <asm/processor.h>
6#include <asm/pgalloc.h> 7#include <asm/pgalloc.h>
7 8
generated by cgit v1.2.2 (git 2.25.0) at 2025-11-15 07:17:40 -0500