#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/kexec.h>
#include <linux/libfdt.h>
#include <linux/mman.h>
#include <linux/nodemask.h>
} while (pmd++, i++, i < PTRS_PER_PMD);
}
-#ifdef CONFIG_DEBUG_PAGEALLOC
-static bool block_mappings_allowed(phys_addr_t (*pgtable_alloc)(void))
-{
-
- /*
- * If debug_page_alloc is enabled we must map the linear map
- * using pages. However, other mappings created by
- * create_mapping_noalloc must use sections in some cases. Allow
- * sections to be used in those cases, where no pgtable_alloc
- * function is provided.
- */
- return !pgtable_alloc || !debug_pagealloc_enabled();
-}
-#else
-static bool block_mappings_allowed(phys_addr_t (*pgtable_alloc)(void))
-{
- return true;
-}
-#endif
-
static void alloc_init_pmd(pud_t *pud, unsigned long addr, unsigned long end,
phys_addr_t phys, pgprot_t prot,
- phys_addr_t (*pgtable_alloc)(void))
+ phys_addr_t (*pgtable_alloc)(void),
+ bool allow_block_mappings)
{
pmd_t *pmd;
unsigned long next;
next = pmd_addr_end(addr, end);
/* try section mapping first */
if (((addr | next | phys) & ~SECTION_MASK) == 0 &&
- block_mappings_allowed(pgtable_alloc)) {
+ (!pgtable_alloc || allow_block_mappings)) {
pmd_t old_pmd =*pmd;
pmd_set_huge(pmd, phys, prot);
/*
static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end,
phys_addr_t phys, pgprot_t prot,
- phys_addr_t (*pgtable_alloc)(void))
+ phys_addr_t (*pgtable_alloc)(void),
+ bool allow_block_mappings)
{
pud_t *pud;
unsigned long next;
* For 4K granule only, attempt to put down a 1GB block
*/
if (use_1G_block(addr, next, phys) &&
- block_mappings_allowed(pgtable_alloc)) {
+ (!pgtable_alloc || allow_block_mappings)) {
pud_t old_pud = *pud;
pud_set_huge(pud, phys, prot);
}
} else {
alloc_init_pmd(pud, addr, next, phys, prot,
- pgtable_alloc);
+ pgtable_alloc, allow_block_mappings);
}
phys += next - addr;
} while (pud++, addr = next, addr != end);
*/
static void init_pgd(pgd_t *pgd, phys_addr_t phys, unsigned long virt,
phys_addr_t size, pgprot_t prot,
- phys_addr_t (*pgtable_alloc)(void))
+ phys_addr_t (*pgtable_alloc)(void),
+ bool allow_block_mappings)
{
unsigned long addr, length, end, next;
end = addr + length;
do {
next = pgd_addr_end(addr, end);
- alloc_init_pud(pgd, addr, next, phys, prot, pgtable_alloc);
+ alloc_init_pud(pgd, addr, next, phys, prot, pgtable_alloc,
+ (!pgtable_alloc || allow_block_mappings));
phys += next - addr;
} while (pgd++, addr = next, addr != end);
}
static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
unsigned long virt, phys_addr_t size,
pgprot_t prot,
- phys_addr_t (*alloc)(void))
+ phys_addr_t (*alloc)(void),
+ bool allow_block_mappings)
{
- init_pgd(pgd_offset_raw(pgdir, virt), phys, virt, size, prot, alloc);
+ init_pgd(pgd_offset_raw(pgdir, virt), phys, virt, size, prot, alloc,
+ allow_block_mappings);
}
/*
&phys, virt);
return;
}
- __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot,
- NULL);
+ __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL, true);
}
void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
unsigned long virt, phys_addr_t size,
- pgprot_t prot)
+ pgprot_t prot, bool allow_block_mappings)
{
__create_pgd_mapping(mm->pgd, phys, virt, size, prot,
- late_pgtable_alloc);
+ late_pgtable_alloc, allow_block_mappings);
}
static void create_mapping_late(phys_addr_t phys, unsigned long virt,
}
__create_pgd_mapping(init_mm.pgd, phys, virt, size, prot,
- late_pgtable_alloc);
+ late_pgtable_alloc, !debug_pagealloc_enabled());
}
-static void __init __map_memblock(pgd_t *pgd, phys_addr_t start, phys_addr_t end)
+static void __init __map_memblock(pgd_t *pgd, phys_addr_t start,
+ phys_addr_t end, pgprot_t prot,
+ bool allow_block_mappings)
+{
+ __create_pgd_mapping(pgd, start, __phys_to_virt(start), end - start,
+ prot, early_pgtable_alloc, allow_block_mappings);
+}
+
+static void __init map_mem(pgd_t *pgd)
{
unsigned long kernel_start = __pa(_text);
unsigned long kernel_end = __pa(__init_begin);
+ struct memblock_region *reg;
/*
* Take care not to create a writable alias for the
* read-only text and rodata sections of the kernel image.
+ * So temporarily mark them as NOMAP to skip mappings in
+ * the following for-loop
*/
-
- /* No overlap with the kernel text/rodata */
- if (end < kernel_start || start >= kernel_end) {
- __create_pgd_mapping(pgd, start, __phys_to_virt(start),
- end - start, PAGE_KERNEL,
- early_pgtable_alloc);
- return;
- }
-
- /*
- * This block overlaps the kernel text/rodata mappings.
- * Map the portion(s) which don't overlap.
- */
- if (start < kernel_start)
- __create_pgd_mapping(pgd, start,
- __phys_to_virt(start),
- kernel_start - start, PAGE_KERNEL,
- early_pgtable_alloc);
- if (kernel_end < end)
- __create_pgd_mapping(pgd, kernel_end,
- __phys_to_virt(kernel_end),
- end - kernel_end, PAGE_KERNEL,
- early_pgtable_alloc);
-
- /*
- * Map the linear alias of the [_text, __init_begin) interval as
- * read-only/non-executable. This makes the contents of the
- * region accessible to subsystems such as hibernate, but
- * protects it from inadvertent modification or execution.
- */
- __create_pgd_mapping(pgd, kernel_start, __phys_to_virt(kernel_start),
- kernel_end - kernel_start, PAGE_KERNEL_RO,
- early_pgtable_alloc);
-}
-
-static void __init map_mem(pgd_t *pgd)
-{
- struct memblock_region *reg;
+ memblock_mark_nomap(kernel_start, kernel_end - kernel_start);
+#ifdef CONFIG_KEXEC_CORE
+ if (crashk_res.end)
+ memblock_mark_nomap(crashk_res.start,
+ resource_size(&crashk_res));
+#endif
/* map all the memory banks */
for_each_memblock(memory, reg) {
if (memblock_is_nomap(reg))
continue;
- __map_memblock(pgd, start, end);
+ __map_memblock(pgd, start, end,
+ PAGE_KERNEL, !debug_pagealloc_enabled());
}
+
+ /*
+ * Map the linear alias of the [_text, __init_begin) interval as
+ * read-only/non-executable. This makes the contents of the
+ * region accessible to subsystems such as hibernate, but
+ * protects it from inadvertent modification or execution.
+ */
+ __map_memblock(pgd, kernel_start, kernel_end,
+ PAGE_KERNEL_RO, !debug_pagealloc_enabled());
+ memblock_clear_nomap(kernel_start, kernel_end - kernel_start);
+
+#ifdef CONFIG_KEXEC_CORE
+ /*
+ * Use page-level mappings here so that we can shrink the region
+ * in page granularity and put back unused memory to buddy system
+ * through /sys/kernel/kexec_crash_size interface.
+ */
+ if (crashk_res.end) {
+ __map_memblock(pgd, crashk_res.start, crashk_res.end + 1,
+ PAGE_KERNEL, false);
+ memblock_clear_nomap(crashk_res.start,
+ resource_size(&crashk_res));
+ }
+#endif
}
void mark_rodata_ro(void)
BUG_ON(!PAGE_ALIGNED(size));
__create_pgd_mapping(pgd, pa_start, (unsigned long)va_start, size, prot,
- early_pgtable_alloc);
+ early_pgtable_alloc, !debug_pagealloc_enabled());
vma->addr = va_start;
vma->phys_addr = pa_start;
projects / firefly-linux-kernel-4.4.55.git / blobdiff