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Diffstat (limited to 'arch/powerpc/mm/pgtable-radix.c')
-rw-r--r--arch/powerpc/mm/pgtable-radix.c265
1 files changed, 224 insertions, 41 deletions
diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index cfa53ccc8baf..feeda90cd06d 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -18,6 +18,7 @@
#include <asm/machdep.h>
#include <asm/mmu.h>
#include <asm/firmware.h>
+#include <asm/powernv.h>
#include <trace/events/thp.h>
@@ -65,7 +66,7 @@ int radix__map_kernel_page(unsigned long ea, unsigned long pa,
if (!pmdp)
return -ENOMEM;
if (map_page_size == PMD_SIZE) {
- ptep = (pte_t *)pudp;
+ ptep = pmdp_ptep(pmdp);
goto set_the_pte;
}
ptep = pte_alloc_kernel(pmdp, ea);
@@ -90,7 +91,7 @@ int radix__map_kernel_page(unsigned long ea, unsigned long pa,
}
pmdp = pmd_offset(pudp, ea);
if (map_page_size == PMD_SIZE) {
- ptep = (pte_t *)pudp;
+ ptep = pmdp_ptep(pmdp);
goto set_the_pte;
}
if (!pmd_present(*pmdp)) {
@@ -107,54 +108,66 @@ set_the_pte:
return 0;
}
+static inline void __meminit print_mapping(unsigned long start,
+ unsigned long end,
+ unsigned long size)
+{
+ if (end <= start)
+ return;
+
+ pr_info("Mapped range 0x%lx - 0x%lx with 0x%lx\n", start, end, size);
+}
+
+static int __meminit create_physical_mapping(unsigned long start,
+ unsigned long end)
+{
+ unsigned long addr, mapping_size = 0;
+
+ start = _ALIGN_UP(start, PAGE_SIZE);
+ for (addr = start; addr < end; addr += mapping_size) {
+ unsigned long gap, previous_size;
+ int rc;
+
+ gap = end - addr;
+ previous_size = mapping_size;
+
+ if (IS_ALIGNED(addr, PUD_SIZE) && gap >= PUD_SIZE &&
+ mmu_psize_defs[MMU_PAGE_1G].shift)
+ mapping_size = PUD_SIZE;
+ else if (IS_ALIGNED(addr, PMD_SIZE) && gap >= PMD_SIZE &&
+ mmu_psize_defs[MMU_PAGE_2M].shift)
+ mapping_size = PMD_SIZE;
+ else
+ mapping_size = PAGE_SIZE;
+
+ if (mapping_size != previous_size) {
+ print_mapping(start, addr, previous_size);
+ start = addr;
+ }
+
+ rc = radix__map_kernel_page((unsigned long)__va(addr), addr,
+ PAGE_KERNEL_X, mapping_size);
+ if (rc)
+ return rc;
+ }
+
+ print_mapping(start, addr, mapping_size);
+ return 0;
+}
+
static void __init radix_init_pgtable(void)
{
- int loop_count;
- u64 base, end, start_addr;
unsigned long rts_field;
struct memblock_region *reg;
- unsigned long linear_page_size;
/* We don't support slb for radix */
mmu_slb_size = 0;
/*
* Create the linear mapping, using standard page size for now
*/
- loop_count = 0;
- for_each_memblock(memory, reg) {
-
- start_addr = reg->base;
-
-redo:
- if (loop_count < 1 && mmu_psize_defs[MMU_PAGE_1G].shift)
- linear_page_size = PUD_SIZE;
- else if (loop_count < 2 && mmu_psize_defs[MMU_PAGE_2M].shift)
- linear_page_size = PMD_SIZE;
- else
- linear_page_size = PAGE_SIZE;
-
- base = _ALIGN_UP(start_addr, linear_page_size);
- end = _ALIGN_DOWN(reg->base + reg->size, linear_page_size);
-
- pr_info("Mapping range 0x%lx - 0x%lx with 0x%lx\n",
- (unsigned long)base, (unsigned long)end,
- linear_page_size);
-
- while (base < end) {
- radix__map_kernel_page((unsigned long)__va(base),
- base, PAGE_KERNEL_X,
- linear_page_size);
- base += linear_page_size;
- }
- /*
- * map the rest using lower page size
- */
- if (end < reg->base + reg->size) {
- start_addr = end;
- loop_count++;
- goto redo;
- }
- }
+ for_each_memblock(memory, reg)
+ WARN_ON(create_physical_mapping(reg->base,
+ reg->base + reg->size));
/*
* Allocate Partition table and process table for the
* host.
@@ -401,6 +414,8 @@ void __init radix__early_init_mmu(void)
mtspr(SPRN_LPCR, lpcr | LPCR_UPRT | LPCR_HR);
radix_init_partition_table();
radix_init_amor();
+ } else {
+ radix_init_pseries();
}
memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE);
@@ -438,6 +453,7 @@ void radix__mmu_cleanup_all(void)
lpcr = mfspr(SPRN_LPCR);
mtspr(SPRN_LPCR, lpcr & ~LPCR_UPRT);
mtspr(SPRN_PTCR, 0);
+ powernv_set_nmmu_ptcr(0);
radix__flush_tlb_all();
}
}
@@ -467,6 +483,173 @@ void radix__setup_initial_memory_limit(phys_addr_t first_memblock_base,
memblock_set_current_limit(first_memblock_base + first_memblock_size);
}
+#ifdef CONFIG_MEMORY_HOTPLUG
+static void free_pte_table(pte_t *pte_start, pmd_t *pmd)
+{
+ pte_t *pte;
+ int i;
+
+ for (i = 0; i < PTRS_PER_PTE; i++) {
+ pte = pte_start + i;
+ if (!pte_none(*pte))
+ return;
+ }
+
+ pte_free_kernel(&init_mm, pte_start);
+ pmd_clear(pmd);
+}
+
+static void free_pmd_table(pmd_t *pmd_start, pud_t *pud)
+{
+ pmd_t *pmd;
+ int i;
+
+ for (i = 0; i < PTRS_PER_PMD; i++) {
+ pmd = pmd_start + i;
+ if (!pmd_none(*pmd))
+ return;
+ }
+
+ pmd_free(&init_mm, pmd_start);
+ pud_clear(pud);
+}
+
+static void remove_pte_table(pte_t *pte_start, unsigned long addr,
+ unsigned long end)
+{
+ unsigned long next;
+ pte_t *pte;
+
+ pte = pte_start + pte_index(addr);
+ for (; addr < end; addr = next, pte++) {
+ next = (addr + PAGE_SIZE) & PAGE_MASK;
+ if (next > end)
+ next = end;
+
+ if (!pte_present(*pte))
+ continue;
+
+ if (!PAGE_ALIGNED(addr) || !PAGE_ALIGNED(next)) {
+ /*
+ * The vmemmap_free() and remove_section_mapping()
+ * codepaths call us with aligned addresses.
+ */
+ WARN_ONCE(1, "%s: unaligned range\n", __func__);
+ continue;
+ }
+
+ pte_clear(&init_mm, addr, pte);
+ }
+}
+
+static void remove_pmd_table(pmd_t *pmd_start, unsigned long addr,
+ unsigned long end)
+{
+ unsigned long next;
+ pte_t *pte_base;
+ pmd_t *pmd;
+
+ pmd = pmd_start + pmd_index(addr);
+ for (; addr < end; addr = next, pmd++) {
+ next = pmd_addr_end(addr, end);
+
+ if (!pmd_present(*pmd))
+ continue;
+
+ if (pmd_huge(*pmd)) {
+ if (!IS_ALIGNED(addr, PMD_SIZE) ||
+ !IS_ALIGNED(next, PMD_SIZE)) {
+ WARN_ONCE(1, "%s: unaligned range\n", __func__);
+ continue;
+ }
+
+ pte_clear(&init_mm, addr, (pte_t *)pmd);
+ continue;
+ }
+
+ pte_base = (pte_t *)pmd_page_vaddr(*pmd);
+ remove_pte_table(pte_base, addr, next);
+ free_pte_table(pte_base, pmd);
+ }
+}
+
+static void remove_pud_table(pud_t *pud_start, unsigned long addr,
+ unsigned long end)
+{
+ unsigned long next;
+ pmd_t *pmd_base;
+ pud_t *pud;
+
+ pud = pud_start + pud_index(addr);
+ for (; addr < end; addr = next, pud++) {
+ next = pud_addr_end(addr, end);
+
+ if (!pud_present(*pud))
+ continue;
+
+ if (pud_huge(*pud)) {
+ if (!IS_ALIGNED(addr, PUD_SIZE) ||
+ !IS_ALIGNED(next, PUD_SIZE)) {
+ WARN_ONCE(1, "%s: unaligned range\n", __func__);
+ continue;
+ }
+
+ pte_clear(&init_mm, addr, (pte_t *)pud);
+ continue;
+ }
+
+ pmd_base = (pmd_t *)pud_page_vaddr(*pud);
+ remove_pmd_table(pmd_base, addr, next);
+ free_pmd_table(pmd_base, pud);
+ }
+}
+
+static void remove_pagetable(unsigned long start, unsigned long end)
+{
+ unsigned long addr, next;
+ pud_t *pud_base;
+ pgd_t *pgd;
+
+ spin_lock(&init_mm.page_table_lock);
+
+ for (addr = start; addr < end; addr = next) {
+ next = pgd_addr_end(addr, end);
+
+ pgd = pgd_offset_k(addr);
+ if (!pgd_present(*pgd))
+ continue;
+
+ if (pgd_huge(*pgd)) {
+ if (!IS_ALIGNED(addr, PGDIR_SIZE) ||
+ !IS_ALIGNED(next, PGDIR_SIZE)) {
+ WARN_ONCE(1, "%s: unaligned range\n", __func__);
+ continue;
+ }
+
+ pte_clear(&init_mm, addr, (pte_t *)pgd);
+ continue;
+ }
+
+ pud_base = (pud_t *)pgd_page_vaddr(*pgd);
+ remove_pud_table(pud_base, addr, next);
+ }
+
+ spin_unlock(&init_mm.page_table_lock);
+ radix__flush_tlb_kernel_range(start, end);
+}
+
+int __ref radix__create_section_mapping(unsigned long start, unsigned long end)
+{
+ return create_physical_mapping(start, end);
+}
+
+int radix__remove_section_mapping(unsigned long start, unsigned long end)
+{
+ remove_pagetable(start, end);
+ return 0;
+}
+#endif /* CONFIG_MEMORY_HOTPLUG */
+
#ifdef CONFIG_SPARSEMEM_VMEMMAP
int __meminit radix__vmemmap_create_mapping(unsigned long start,
unsigned long page_size,
@@ -482,7 +665,7 @@ int __meminit radix__vmemmap_create_mapping(unsigned long start,
#ifdef CONFIG_MEMORY_HOTPLUG
void radix__vmemmap_remove_mapping(unsigned long start, unsigned long page_size)
{
- /* FIXME!! intel does more. We should free page tables mapping vmemmap ? */
+ remove_pagetable(start, start + page_size);
}
#endif
#endif
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-02 14:49:43 +0300