RISC-V: Add kernel image sections to the resource tree
This patch (previously part of my kexec/kdump series) populates /proc/iomem with the various sections of the kernel image. We need this for kexec-tools to be able to prepare the crashkernel image for kdump to work. Since resource tree initialization is not related to memory initialization I added the code to kernel/setup.c and removed the original code (derived from the arm64 tree) from mm/init.c. Signed-off-by: Nick Kossifidis <mick@ics.forth.gr> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
parent
3650b228f8
commit
00ab027a3b
|
@ -4,6 +4,8 @@
|
|||
* Chen Liqin <liqin.chen@sunplusct.com>
|
||||
* Lennox Wu <lennox.wu@sunplusct.com>
|
||||
* Copyright (C) 2012 Regents of the University of California
|
||||
* Copyright (C) 2020 FORTH-ICS/CARV
|
||||
* Nick Kossifidis <mick@ics.forth.gr>
|
||||
*/
|
||||
|
||||
#include <linux/init.h>
|
||||
|
@ -51,6 +53,163 @@ atomic_t hart_lottery __section(".sdata");
|
|||
unsigned long boot_cpu_hartid;
|
||||
static DEFINE_PER_CPU(struct cpu, cpu_devices);
|
||||
|
||||
/*
|
||||
* Place kernel memory regions on the resource tree so that
|
||||
* kexec-tools can retrieve them from /proc/iomem. While there
|
||||
* also add "System RAM" regions for compatibility with other
|
||||
* archs, and the rest of the known regions for completeness.
|
||||
*/
|
||||
static struct resource code_res = { .name = "Kernel code", };
|
||||
static struct resource data_res = { .name = "Kernel data", };
|
||||
static struct resource rodata_res = { .name = "Kernel rodata", };
|
||||
static struct resource bss_res = { .name = "Kernel bss", };
|
||||
|
||||
static int __init add_resource(struct resource *parent,
|
||||
struct resource *res)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
ret = insert_resource(parent, res);
|
||||
if (ret < 0) {
|
||||
pr_err("Failed to add a %s resource at %llx\n",
|
||||
res->name, (unsigned long long) res->start);
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int __init add_kernel_resources(struct resource *res)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
/*
|
||||
* The memory region of the kernel image is continuous and
|
||||
* was reserved on setup_bootmem, find it here and register
|
||||
* it as a resource, then register the various segments of
|
||||
* the image as child nodes
|
||||
*/
|
||||
if (!(res->start <= code_res.start && res->end >= data_res.end))
|
||||
return 0;
|
||||
|
||||
res->name = "Kernel image";
|
||||
res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
|
||||
|
||||
/*
|
||||
* We removed a part of this region on setup_bootmem so
|
||||
* we need to expand the resource for the bss to fit in.
|
||||
*/
|
||||
res->end = bss_res.end;
|
||||
|
||||
ret = add_resource(&iomem_resource, res);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = add_resource(res, &code_res);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = add_resource(res, &rodata_res);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = add_resource(res, &data_res);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = add_resource(res, &bss_res);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __init init_resources(void)
|
||||
{
|
||||
struct memblock_region *region = NULL;
|
||||
struct resource *res = NULL;
|
||||
int ret = 0;
|
||||
|
||||
code_res.start = __pa_symbol(_text);
|
||||
code_res.end = __pa_symbol(_etext) - 1;
|
||||
code_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
|
||||
|
||||
rodata_res.start = __pa_symbol(__start_rodata);
|
||||
rodata_res.end = __pa_symbol(__end_rodata) - 1;
|
||||
rodata_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
|
||||
|
||||
data_res.start = __pa_symbol(_data);
|
||||
data_res.end = __pa_symbol(_edata) - 1;
|
||||
data_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
|
||||
|
||||
bss_res.start = __pa_symbol(__bss_start);
|
||||
bss_res.end = __pa_symbol(__bss_stop) - 1;
|
||||
bss_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
|
||||
|
||||
/*
|
||||
* Start by adding the reserved regions, if they overlap
|
||||
* with /memory regions, insert_resource later on will take
|
||||
* care of it.
|
||||
*/
|
||||
for_each_reserved_mem_region(region) {
|
||||
res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
|
||||
if (!res)
|
||||
panic("%s: Failed to allocate %zu bytes\n", __func__,
|
||||
sizeof(struct resource));
|
||||
|
||||
res->name = "Reserved";
|
||||
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
|
||||
res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
|
||||
res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
|
||||
|
||||
ret = add_kernel_resources(res);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
else if (ret)
|
||||
continue;
|
||||
|
||||
/*
|
||||
* Ignore any other reserved regions within
|
||||
* system memory.
|
||||
*/
|
||||
if (memblock_is_memory(res->start))
|
||||
continue;
|
||||
|
||||
ret = add_resource(&iomem_resource, res);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* Add /memory regions to the resource tree */
|
||||
for_each_mem_region(region) {
|
||||
res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
|
||||
if (!res)
|
||||
panic("%s: Failed to allocate %zu bytes\n", __func__,
|
||||
sizeof(struct resource));
|
||||
|
||||
if (unlikely(memblock_is_nomap(region))) {
|
||||
res->name = "Reserved";
|
||||
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
|
||||
} else {
|
||||
res->name = "System RAM";
|
||||
res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
|
||||
}
|
||||
|
||||
res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
|
||||
res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
|
||||
|
||||
ret = add_resource(&iomem_resource, res);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
}
|
||||
|
||||
return;
|
||||
|
||||
error:
|
||||
memblock_free((phys_addr_t) res, sizeof(struct resource));
|
||||
/* Better an empty resource tree than an inconsistent one */
|
||||
release_child_resources(&iomem_resource);
|
||||
}
|
||||
|
||||
|
||||
static void __init parse_dtb(void)
|
||||
{
|
||||
/* Early scan of device tree from init memory */
|
||||
|
@ -80,6 +239,7 @@ void __init setup_arch(char **cmdline_p)
|
|||
efi_init();
|
||||
setup_bootmem();
|
||||
paging_init();
|
||||
init_resources();
|
||||
#if IS_ENABLED(CONFIG_BUILTIN_DTB)
|
||||
unflatten_and_copy_device_tree();
|
||||
#else
|
||||
|
|
|
@ -625,39 +625,12 @@ void mark_rodata_ro(void)
|
|||
}
|
||||
#endif
|
||||
|
||||
static void __init resource_init(void)
|
||||
{
|
||||
struct memblock_region *region;
|
||||
|
||||
for_each_mem_region(region) {
|
||||
struct resource *res;
|
||||
|
||||
res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
|
||||
if (!res)
|
||||
panic("%s: Failed to allocate %zu bytes\n", __func__,
|
||||
sizeof(struct resource));
|
||||
|
||||
if (memblock_is_nomap(region)) {
|
||||
res->name = "reserved";
|
||||
res->flags = IORESOURCE_MEM;
|
||||
} else {
|
||||
res->name = "System RAM";
|
||||
res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
|
||||
}
|
||||
res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
|
||||
res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
|
||||
|
||||
request_resource(&iomem_resource, res);
|
||||
}
|
||||
}
|
||||
|
||||
void __init paging_init(void)
|
||||
{
|
||||
setup_vm_final();
|
||||
sparse_init();
|
||||
setup_zero_page();
|
||||
zone_sizes_init();
|
||||
resource_init();
|
||||
}
|
||||
|
||||
#ifdef CONFIG_SPARSEMEM_VMEMMAP
|
||||
|
|
Loading…
Reference in a new issue