mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
320 lines
7.7 KiB
320 lines
7.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* S390 version |
|
* Copyright IBM Corp. 1999 |
|
* Author(s): Hartmut Penner ([email protected]) |
|
* |
|
* Derived from "arch/i386/mm/init.c" |
|
* Copyright (C) 1995 Linus Torvalds |
|
*/ |
|
|
|
#include <linux/signal.h> |
|
#include <linux/sched.h> |
|
#include <linux/kernel.h> |
|
#include <linux/errno.h> |
|
#include <linux/string.h> |
|
#include <linux/types.h> |
|
#include <linux/ptrace.h> |
|
#include <linux/mman.h> |
|
#include <linux/mm.h> |
|
#include <linux/swap.h> |
|
#include <linux/swiotlb.h> |
|
#include <linux/smp.h> |
|
#include <linux/init.h> |
|
#include <linux/pagemap.h> |
|
#include <linux/memblock.h> |
|
#include <linux/memory.h> |
|
#include <linux/pfn.h> |
|
#include <linux/poison.h> |
|
#include <linux/initrd.h> |
|
#include <linux/export.h> |
|
#include <linux/cma.h> |
|
#include <linux/gfp.h> |
|
#include <linux/dma-direct.h> |
|
#include <asm/processor.h> |
|
#include <linux/uaccess.h> |
|
#include <asm/pgalloc.h> |
|
#include <asm/ptdump.h> |
|
#include <asm/dma.h> |
|
#include <asm/lowcore.h> |
|
#include <asm/tlb.h> |
|
#include <asm/tlbflush.h> |
|
#include <asm/sections.h> |
|
#include <asm/ctl_reg.h> |
|
#include <asm/sclp.h> |
|
#include <asm/set_memory.h> |
|
#include <asm/kasan.h> |
|
#include <asm/dma-mapping.h> |
|
#include <asm/uv.h> |
|
#include <linux/virtio_config.h> |
|
|
|
pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".bss..swapper_pg_dir"); |
|
static pgd_t invalid_pg_dir[PTRS_PER_PGD] __section(".bss..invalid_pg_dir"); |
|
|
|
unsigned long s390_invalid_asce; |
|
|
|
unsigned long empty_zero_page, zero_page_mask; |
|
EXPORT_SYMBOL(empty_zero_page); |
|
EXPORT_SYMBOL(zero_page_mask); |
|
|
|
bool initmem_freed; |
|
|
|
static void __init setup_zero_pages(void) |
|
{ |
|
unsigned int order; |
|
struct page *page; |
|
int i; |
|
|
|
/* Latest machines require a mapping granularity of 512KB */ |
|
order = 7; |
|
|
|
/* Limit number of empty zero pages for small memory sizes */ |
|
while (order > 2 && (totalram_pages() >> 10) < (1UL << order)) |
|
order--; |
|
|
|
empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); |
|
if (!empty_zero_page) |
|
panic("Out of memory in setup_zero_pages"); |
|
|
|
page = virt_to_page((void *) empty_zero_page); |
|
split_page(page, order); |
|
for (i = 1 << order; i > 0; i--) { |
|
mark_page_reserved(page); |
|
page++; |
|
} |
|
|
|
zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK; |
|
} |
|
|
|
/* |
|
* paging_init() sets up the page tables |
|
*/ |
|
void __init paging_init(void) |
|
{ |
|
unsigned long max_zone_pfns[MAX_NR_ZONES]; |
|
unsigned long pgd_type, asce_bits; |
|
psw_t psw; |
|
|
|
s390_invalid_asce = (unsigned long)invalid_pg_dir; |
|
s390_invalid_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; |
|
crst_table_init((unsigned long *)invalid_pg_dir, _REGION3_ENTRY_EMPTY); |
|
init_mm.pgd = swapper_pg_dir; |
|
if (VMALLOC_END > _REGION2_SIZE) { |
|
asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH; |
|
pgd_type = _REGION2_ENTRY_EMPTY; |
|
} else { |
|
asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; |
|
pgd_type = _REGION3_ENTRY_EMPTY; |
|
} |
|
init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits; |
|
S390_lowcore.kernel_asce = init_mm.context.asce; |
|
S390_lowcore.user_asce = s390_invalid_asce; |
|
crst_table_init((unsigned long *) init_mm.pgd, pgd_type); |
|
vmem_map_init(); |
|
kasan_copy_shadow_mapping(); |
|
|
|
/* enable virtual mapping in kernel mode */ |
|
__ctl_load(S390_lowcore.kernel_asce, 1, 1); |
|
__ctl_load(S390_lowcore.user_asce, 7, 7); |
|
__ctl_load(S390_lowcore.kernel_asce, 13, 13); |
|
psw.mask = __extract_psw(); |
|
psw_bits(psw).dat = 1; |
|
psw_bits(psw).as = PSW_BITS_AS_HOME; |
|
__load_psw_mask(psw.mask); |
|
kasan_free_early_identity(); |
|
|
|
sparse_init(); |
|
zone_dma_bits = 31; |
|
memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
|
max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); |
|
max_zone_pfns[ZONE_NORMAL] = max_low_pfn; |
|
free_area_init(max_zone_pfns); |
|
} |
|
|
|
void mark_rodata_ro(void) |
|
{ |
|
unsigned long size = __end_ro_after_init - __start_ro_after_init; |
|
|
|
set_memory_ro((unsigned long)__start_ro_after_init, size >> PAGE_SHIFT); |
|
pr_info("Write protected read-only-after-init data: %luk\n", size >> 10); |
|
debug_checkwx(); |
|
} |
|
|
|
int set_memory_encrypted(unsigned long addr, int numpages) |
|
{ |
|
int i; |
|
|
|
/* make specified pages unshared, (swiotlb, dma_free) */ |
|
for (i = 0; i < numpages; ++i) { |
|
uv_remove_shared(addr); |
|
addr += PAGE_SIZE; |
|
} |
|
return 0; |
|
} |
|
|
|
int set_memory_decrypted(unsigned long addr, int numpages) |
|
{ |
|
int i; |
|
/* make specified pages shared (swiotlb, dma_alloca) */ |
|
for (i = 0; i < numpages; ++i) { |
|
uv_set_shared(addr); |
|
addr += PAGE_SIZE; |
|
} |
|
return 0; |
|
} |
|
|
|
/* are we a protected virtualization guest? */ |
|
bool force_dma_unencrypted(struct device *dev) |
|
{ |
|
return is_prot_virt_guest(); |
|
} |
|
|
|
#ifdef CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS |
|
|
|
int arch_has_restricted_virtio_memory_access(void) |
|
{ |
|
return is_prot_virt_guest(); |
|
} |
|
EXPORT_SYMBOL(arch_has_restricted_virtio_memory_access); |
|
|
|
#endif |
|
|
|
/* protected virtualization */ |
|
static void pv_init(void) |
|
{ |
|
if (!is_prot_virt_guest()) |
|
return; |
|
|
|
/* make sure bounce buffers are shared */ |
|
swiotlb_init(1); |
|
swiotlb_update_mem_attributes(); |
|
swiotlb_force = SWIOTLB_FORCE; |
|
} |
|
|
|
void __init mem_init(void) |
|
{ |
|
cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask); |
|
cpumask_set_cpu(0, mm_cpumask(&init_mm)); |
|
|
|
set_max_mapnr(max_low_pfn); |
|
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
|
|
|
pv_init(); |
|
|
|
/* Setup guest page hinting */ |
|
cmma_init(); |
|
|
|
/* this will put all low memory onto the freelists */ |
|
memblock_free_all(); |
|
setup_zero_pages(); /* Setup zeroed pages. */ |
|
|
|
cmma_init_nodat(); |
|
|
|
mem_init_print_info(NULL); |
|
} |
|
|
|
void free_initmem(void) |
|
{ |
|
initmem_freed = true; |
|
__set_memory((unsigned long)_sinittext, |
|
(unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT, |
|
SET_MEMORY_RW | SET_MEMORY_NX); |
|
free_initmem_default(POISON_FREE_INITMEM); |
|
} |
|
|
|
unsigned long memory_block_size_bytes(void) |
|
{ |
|
/* |
|
* Make sure the memory block size is always greater |
|
* or equal than the memory increment size. |
|
*/ |
|
return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm); |
|
} |
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG |
|
|
|
#ifdef CONFIG_CMA |
|
|
|
/* Prevent memory blocks which contain cma regions from going offline */ |
|
|
|
struct s390_cma_mem_data { |
|
unsigned long start; |
|
unsigned long end; |
|
}; |
|
|
|
static int s390_cma_check_range(struct cma *cma, void *data) |
|
{ |
|
struct s390_cma_mem_data *mem_data; |
|
unsigned long start, end; |
|
|
|
mem_data = data; |
|
start = cma_get_base(cma); |
|
end = start + cma_get_size(cma); |
|
if (end < mem_data->start) |
|
return 0; |
|
if (start >= mem_data->end) |
|
return 0; |
|
return -EBUSY; |
|
} |
|
|
|
static int s390_cma_mem_notifier(struct notifier_block *nb, |
|
unsigned long action, void *data) |
|
{ |
|
struct s390_cma_mem_data mem_data; |
|
struct memory_notify *arg; |
|
int rc = 0; |
|
|
|
arg = data; |
|
mem_data.start = arg->start_pfn << PAGE_SHIFT; |
|
mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT); |
|
if (action == MEM_GOING_OFFLINE) |
|
rc = cma_for_each_area(s390_cma_check_range, &mem_data); |
|
return notifier_from_errno(rc); |
|
} |
|
|
|
static struct notifier_block s390_cma_mem_nb = { |
|
.notifier_call = s390_cma_mem_notifier, |
|
}; |
|
|
|
static int __init s390_cma_mem_init(void) |
|
{ |
|
return register_memory_notifier(&s390_cma_mem_nb); |
|
} |
|
device_initcall(s390_cma_mem_init); |
|
|
|
#endif /* CONFIG_CMA */ |
|
|
|
int arch_add_memory(int nid, u64 start, u64 size, |
|
struct mhp_params *params) |
|
{ |
|
unsigned long start_pfn = PFN_DOWN(start); |
|
unsigned long size_pages = PFN_DOWN(size); |
|
int rc; |
|
|
|
if (WARN_ON_ONCE(params->altmap)) |
|
return -EINVAL; |
|
|
|
if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot)) |
|
return -EINVAL; |
|
|
|
VM_BUG_ON(!mhp_range_allowed(start, size, true)); |
|
rc = vmem_add_mapping(start, size); |
|
if (rc) |
|
return rc; |
|
|
|
rc = __add_pages(nid, start_pfn, size_pages, params); |
|
if (rc) |
|
vmem_remove_mapping(start, size); |
|
return rc; |
|
} |
|
|
|
void arch_remove_memory(int nid, u64 start, u64 size, |
|
struct vmem_altmap *altmap) |
|
{ |
|
unsigned long start_pfn = start >> PAGE_SHIFT; |
|
unsigned long nr_pages = size >> PAGE_SHIFT; |
|
|
|
__remove_pages(start_pfn, nr_pages, altmap); |
|
vmem_remove_mapping(start, size); |
|
} |
|
#endif /* CONFIG_MEMORY_HOTPLUG */
|
|
|