mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-14 22:44:27 +08:00
0cc2dc4902
execmem does not depend on modules, on the contrary modules use execmem. To make execmem available when CONFIG_MODULES=n, for instance for kprobes, split execmem_params initialization out from arch/*/kernel/module.c and compile it when CONFIG_EXECMEM=y Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
335 lines
7.8 KiB
C
335 lines
7.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* S390 version
|
|
* Copyright IBM Corp. 1999
|
|
* Author(s): Hartmut Penner (hp@de.ibm.com)
|
|
*
|
|
* 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 <linux/percpu.h>
|
|
#include <asm/processor.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/ctlreg.h>
|
|
#include <asm/kfence.h>
|
|
#include <asm/dma.h>
|
|
#include <asm/abs_lowcore.h>
|
|
#include <asm/tlb.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/sections.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_anchor.h>
|
|
#include <linux/virtio_config.h>
|
|
#include <linux/execmem.h>
|
|
|
|
pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".bss..swapper_pg_dir");
|
|
pgd_t invalid_pg_dir[PTRS_PER_PGD] __section(".bss..invalid_pg_dir");
|
|
|
|
struct ctlreg __bootdata_preserved(s390_invalid_asce);
|
|
|
|
unsigned long empty_zero_page, zero_page_mask;
|
|
EXPORT_SYMBOL(empty_zero_page);
|
|
EXPORT_SYMBOL(zero_page_mask);
|
|
|
|
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];
|
|
|
|
vmem_map_init();
|
|
sparse_init();
|
|
zone_dma_bits = 31;
|
|
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
|
|
max_zone_pfns[ZONE_DMA] = virt_to_pfn(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(__start_ro_after_init, __end_ro_after_init);
|
|
pr_info("Write protected read-only-after-init data: %luk\n", size >> 10);
|
|
}
|
|
|
|
int set_memory_encrypted(unsigned long vaddr, int numpages)
|
|
{
|
|
int i;
|
|
|
|
/* make specified pages unshared, (swiotlb, dma_free) */
|
|
for (i = 0; i < numpages; ++i) {
|
|
uv_remove_shared(virt_to_phys((void *)vaddr));
|
|
vaddr += PAGE_SIZE;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int set_memory_decrypted(unsigned long vaddr, int numpages)
|
|
{
|
|
int i;
|
|
/* make specified pages shared (swiotlb, dma_alloca) */
|
|
for (i = 0; i < numpages; ++i) {
|
|
uv_set_shared(virt_to_phys((void *)vaddr));
|
|
vaddr += PAGE_SIZE;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* are we a protected virtualization guest? */
|
|
bool force_dma_unencrypted(struct device *dev)
|
|
{
|
|
return is_prot_virt_guest();
|
|
}
|
|
|
|
/* protected virtualization */
|
|
static void pv_init(void)
|
|
{
|
|
if (!is_prot_virt_guest())
|
|
return;
|
|
|
|
virtio_set_mem_acc_cb(virtio_require_restricted_mem_acc);
|
|
|
|
/* make sure bounce buffers are shared */
|
|
swiotlb_init(true, SWIOTLB_FORCE | SWIOTLB_VERBOSE);
|
|
swiotlb_update_mem_attributes();
|
|
}
|
|
|
|
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();
|
|
kfence_split_mapping();
|
|
|
|
/* this will put all low memory onto the freelists */
|
|
memblock_free_all();
|
|
setup_zero_pages(); /* Setup zeroed pages. */
|
|
}
|
|
|
|
void free_initmem(void)
|
|
{
|
|
set_memory_rwnx((unsigned long)_sinittext,
|
|
(unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT);
|
|
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);
|
|
}
|
|
|
|
unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
|
|
EXPORT_SYMBOL(__per_cpu_offset);
|
|
|
|
static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
|
|
{
|
|
return LOCAL_DISTANCE;
|
|
}
|
|
|
|
static int __init pcpu_cpu_to_node(int cpu)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void __init setup_per_cpu_areas(void)
|
|
{
|
|
unsigned long delta;
|
|
unsigned int cpu;
|
|
int rc;
|
|
|
|
/*
|
|
* Always reserve area for module percpu variables. That's
|
|
* what the legacy allocator did.
|
|
*/
|
|
rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
|
|
PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
|
|
pcpu_cpu_distance,
|
|
pcpu_cpu_to_node);
|
|
if (rc < 0)
|
|
panic("Failed to initialize percpu areas.");
|
|
|
|
delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
|
|
for_each_possible_cpu(cpu)
|
|
__per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
|
|
}
|
|
|
|
#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->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(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 */
|
|
|
|
#ifdef CONFIG_EXECMEM
|
|
static struct execmem_info execmem_info __ro_after_init;
|
|
|
|
struct execmem_info __init *execmem_arch_setup(void)
|
|
{
|
|
unsigned long module_load_offset = 0;
|
|
unsigned long start;
|
|
|
|
if (kaslr_enabled())
|
|
module_load_offset = get_random_u32_inclusive(1, 1024) * PAGE_SIZE;
|
|
|
|
start = MODULES_VADDR + module_load_offset;
|
|
|
|
execmem_info = (struct execmem_info){
|
|
.ranges = {
|
|
[EXECMEM_DEFAULT] = {
|
|
.flags = EXECMEM_KASAN_SHADOW,
|
|
.start = start,
|
|
.end = MODULES_END,
|
|
.pgprot = PAGE_KERNEL,
|
|
.alignment = MODULE_ALIGN,
|
|
},
|
|
},
|
|
};
|
|
|
|
return &execmem_info;
|
|
}
|
|
#endif /* CONFIG_EXECMEM */
|