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Diffstat (limited to 'arch/s390/mm/vmem.c')
-rw-r--r--arch/s390/mm/vmem.c73
1 files changed, 33 insertions, 40 deletions
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index d48cf25cfe99..1848292766ef 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -11,6 +11,7 @@
#include <linux/hugetlb.h>
#include <linux/slab.h>
#include <linux/memblock.h>
+#include <asm/cacheflush.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/setup.h>
@@ -29,9 +30,11 @@ static LIST_HEAD(mem_segs);
static void __ref *vmem_alloc_pages(unsigned int order)
{
+ unsigned long size = PAGE_SIZE << order;
+
if (slab_is_available())
return (void *)__get_free_pages(GFP_KERNEL, order);
- return alloc_bootmem_pages((1 << order) * PAGE_SIZE);
+ return alloc_bootmem_align(size, size);
}
static inline pud_t *vmem_pud_alloc(void)
@@ -45,7 +48,7 @@ static inline pud_t *vmem_pud_alloc(void)
return pud;
}
-static inline pmd_t *vmem_pmd_alloc(void)
+pmd_t *vmem_pmd_alloc(void)
{
pmd_t *pmd = NULL;
@@ -56,7 +59,7 @@ static inline pmd_t *vmem_pmd_alloc(void)
return pmd;
}
-static pte_t __ref *vmem_pte_alloc(void)
+pte_t __ref *vmem_pte_alloc(void)
{
pte_t *pte;
@@ -75,8 +78,9 @@ static pte_t __ref *vmem_pte_alloc(void)
/*
* Add a physical memory range to the 1:1 mapping.
*/
-static int vmem_add_mem(unsigned long start, unsigned long size, int ro)
+static int vmem_add_mem(unsigned long start, unsigned long size)
{
+ unsigned long pages4k, pages1m, pages2g;
unsigned long end = start + size;
unsigned long address = start;
pgd_t *pg_dir;
@@ -85,6 +89,7 @@ static int vmem_add_mem(unsigned long start, unsigned long size, int ro)
pte_t *pt_dir;
int ret = -ENOMEM;
+ pages4k = pages1m = pages2g = 0;
while (address < end) {
pg_dir = pgd_offset_k(address);
if (pgd_none(*pg_dir)) {
@@ -97,10 +102,9 @@ static int vmem_add_mem(unsigned long start, unsigned long size, int ro)
if (MACHINE_HAS_EDAT2 && pud_none(*pu_dir) && address &&
!(address & ~PUD_MASK) && (address + PUD_SIZE <= end) &&
!debug_pagealloc_enabled()) {
- pud_val(*pu_dir) = __pa(address) |
- _REGION_ENTRY_TYPE_R3 | _REGION3_ENTRY_LARGE |
- (ro ? _REGION_ENTRY_PROTECT : 0);
+ pud_val(*pu_dir) = address | pgprot_val(REGION3_KERNEL);
address += PUD_SIZE;
+ pages2g++;
continue;
}
if (pud_none(*pu_dir)) {
@@ -113,11 +117,9 @@ static int vmem_add_mem(unsigned long start, unsigned long size, int ro)
if (MACHINE_HAS_EDAT1 && pmd_none(*pm_dir) && address &&
!(address & ~PMD_MASK) && (address + PMD_SIZE <= end) &&
!debug_pagealloc_enabled()) {
- pmd_val(*pm_dir) = __pa(address) |
- _SEGMENT_ENTRY | _SEGMENT_ENTRY_LARGE |
- _SEGMENT_ENTRY_YOUNG |
- (ro ? _SEGMENT_ENTRY_PROTECT : 0);
+ pmd_val(*pm_dir) = address | pgprot_val(SEGMENT_KERNEL);
address += PMD_SIZE;
+ pages1m++;
continue;
}
if (pmd_none(*pm_dir)) {
@@ -128,12 +130,15 @@ static int vmem_add_mem(unsigned long start, unsigned long size, int ro)
}
pt_dir = pte_offset_kernel(pm_dir, address);
- pte_val(*pt_dir) = __pa(address) |
- pgprot_val(ro ? PAGE_KERNEL_RO : PAGE_KERNEL);
+ pte_val(*pt_dir) = address | pgprot_val(PAGE_KERNEL);
address += PAGE_SIZE;
+ pages4k++;
}
ret = 0;
out:
+ update_page_count(PG_DIRECT_MAP_4K, pages4k);
+ update_page_count(PG_DIRECT_MAP_1M, pages1m);
+ update_page_count(PG_DIRECT_MAP_2G, pages2g);
return ret;
}
@@ -143,15 +148,15 @@ out:
*/
static void vmem_remove_range(unsigned long start, unsigned long size)
{
+ unsigned long pages4k, pages1m, pages2g;
unsigned long end = start + size;
unsigned long address = start;
pgd_t *pg_dir;
pud_t *pu_dir;
pmd_t *pm_dir;
pte_t *pt_dir;
- pte_t pte;
- pte_val(pte) = _PAGE_INVALID;
+ pages4k = pages1m = pages2g = 0;
while (address < end) {
pg_dir = pgd_offset_k(address);
if (pgd_none(*pg_dir)) {
@@ -166,6 +171,7 @@ static void vmem_remove_range(unsigned long start, unsigned long size)
if (pud_large(*pu_dir)) {
pud_clear(pu_dir);
address += PUD_SIZE;
+ pages2g++;
continue;
}
pm_dir = pmd_offset(pu_dir, address);
@@ -176,13 +182,18 @@ static void vmem_remove_range(unsigned long start, unsigned long size)
if (pmd_large(*pm_dir)) {
pmd_clear(pm_dir);
address += PMD_SIZE;
+ pages1m++;
continue;
}
pt_dir = pte_offset_kernel(pm_dir, address);
- *pt_dir = pte;
+ pte_clear(&init_mm, address, pt_dir);
address += PAGE_SIZE;
+ pages4k++;
}
flush_tlb_kernel_range(start, end);
+ update_page_count(PG_DIRECT_MAP_4K, -pages4k);
+ update_page_count(PG_DIRECT_MAP_1M, -pages1m);
+ update_page_count(PG_DIRECT_MAP_2G, -pages2g);
}
/*
@@ -341,7 +352,7 @@ int vmem_add_mapping(unsigned long start, unsigned long size)
if (ret)
goto out_free;
- ret = vmem_add_mem(start, size, 0);
+ ret = vmem_add_mem(start, size);
if (ret)
goto out_remove;
goto out;
@@ -362,31 +373,13 @@ out:
*/
void __init vmem_map_init(void)
{
- unsigned long ro_start, ro_end;
+ unsigned long size = _eshared - _stext;
struct memblock_region *reg;
- phys_addr_t start, end;
- ro_start = PFN_ALIGN((unsigned long)&_stext);
- ro_end = (unsigned long)&_eshared & PAGE_MASK;
- for_each_memblock(memory, reg) {
- start = reg->base;
- end = reg->base + reg->size;
- if (start >= ro_end || end <= ro_start)
- vmem_add_mem(start, end - start, 0);
- else if (start >= ro_start && end <= ro_end)
- vmem_add_mem(start, end - start, 1);
- else if (start >= ro_start) {
- vmem_add_mem(start, ro_end - start, 1);
- vmem_add_mem(ro_end, end - ro_end, 0);
- } else if (end < ro_end) {
- vmem_add_mem(start, ro_start - start, 0);
- vmem_add_mem(ro_start, end - ro_start, 1);
- } else {
- vmem_add_mem(start, ro_start - start, 0);
- vmem_add_mem(ro_start, ro_end - ro_start, 1);
- vmem_add_mem(ro_end, end - ro_end, 0);
- }
- }
+ for_each_memblock(memory, reg)
+ vmem_add_mem(reg->base, reg->size);
+ set_memory_ro((unsigned long)_stext, size >> PAGE_SHIFT);
+ pr_info("Write protected kernel read-only data: %luk\n", size >> 10);
}
/*
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.