mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-05 16:37:50 +00:00
arm64: Use common of_kexec_alloc_and_setup_fdt()
The code for setting up the /chosen node in the device tree and updating the memory reservation for the next kernel has been moved to of_kexec_alloc_and_setup_fdt() defined in "drivers/of/kexec.c". Use the common of_kexec_alloc_and_setup_fdt() to setup the device tree and update the memory reservation for kexec for arm64. Signed-off-by: Rob Herring <robh@kernel.org> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com> Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com> Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20210221174930.27324-7-nramas@linux.microsoft.com
This commit is contained in:
Rob Herring
parent
b30be4dc73
commit
ac10be5cdb
1 changed files with 8 additions and 174 deletions
|
|
@ -15,23 +15,12 @@
|
|||
#include <linux/kexec.h>
|
||||
#include <linux/libfdt.h>
|
||||
#include <linux/memblock.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/of_fdt.h>
|
||||
#include <linux/random.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/string.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/vmalloc.h>
|
||||
#include <asm/byteorder.h>
|
||||
|
||||
/* relevant device tree properties */
|
||||
#define FDT_PROP_KEXEC_ELFHDR "linux,elfcorehdr"
|
||||
#define FDT_PROP_MEM_RANGE "linux,usable-memory-range"
|
||||
#define FDT_PROP_INITRD_START "linux,initrd-start"
|
||||
#define FDT_PROP_INITRD_END "linux,initrd-end"
|
||||
#define FDT_PROP_BOOTARGS "bootargs"
|
||||
#define FDT_PROP_KASLR_SEED "kaslr-seed"
|
||||
#define FDT_PROP_RNG_SEED "rng-seed"
|
||||
#define RNG_SEED_SIZE 128
|
||||
|
||||
const struct kexec_file_ops * const kexec_file_loaders[] = {
|
||||
&kexec_image_ops,
|
||||
|
|
@ -40,7 +29,7 @@ const struct kexec_file_ops * const kexec_file_loaders[] = {
|
|||
|
||||
int arch_kimage_file_post_load_cleanup(struct kimage *image)
|
||||
{
|
||||
vfree(image->arch.dtb);
|
||||
kvfree(image->arch.dtb);
|
||||
image->arch.dtb = NULL;
|
||||
|
||||
vfree(image->elf_headers);
|
||||
|
|
@ -50,164 +39,6 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
|
|||
return kexec_image_post_load_cleanup_default(image);
|
||||
}
|
||||
|
||||
static int setup_dtb(struct kimage *image,
|
||||
unsigned long initrd_load_addr, unsigned long initrd_len,
|
||||
char *cmdline, void *dtb)
|
||||
{
|
||||
int off, ret;
|
||||
|
||||
ret = fdt_path_offset(dtb, "/chosen");
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
off = ret;
|
||||
|
||||
ret = fdt_delprop(dtb, off, FDT_PROP_KEXEC_ELFHDR);
|
||||
if (ret && ret != -FDT_ERR_NOTFOUND)
|
||||
goto out;
|
||||
ret = fdt_delprop(dtb, off, FDT_PROP_MEM_RANGE);
|
||||
if (ret && ret != -FDT_ERR_NOTFOUND)
|
||||
goto out;
|
||||
|
||||
if (image->type == KEXEC_TYPE_CRASH) {
|
||||
/* add linux,elfcorehdr */
|
||||
ret = fdt_appendprop_addrrange(dtb, 0, off,
|
||||
FDT_PROP_KEXEC_ELFHDR,
|
||||
image->elf_load_addr,
|
||||
image->elf_headers_sz);
|
||||
if (ret)
|
||||
return (ret == -FDT_ERR_NOSPACE ? -ENOMEM : -EINVAL);
|
||||
|
||||
/* add linux,usable-memory-range */
|
||||
ret = fdt_appendprop_addrrange(dtb, 0, off,
|
||||
FDT_PROP_MEM_RANGE,
|
||||
crashk_res.start,
|
||||
crashk_res.end - crashk_res.start + 1);
|
||||
if (ret)
|
||||
return (ret == -FDT_ERR_NOSPACE ? -ENOMEM : -EINVAL);
|
||||
}
|
||||
|
||||
/* add bootargs */
|
||||
if (cmdline) {
|
||||
ret = fdt_setprop_string(dtb, off, FDT_PROP_BOOTARGS, cmdline);
|
||||
if (ret)
|
||||
goto out;
|
||||
} else {
|
||||
ret = fdt_delprop(dtb, off, FDT_PROP_BOOTARGS);
|
||||
if (ret && (ret != -FDT_ERR_NOTFOUND))
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* add initrd-* */
|
||||
if (initrd_load_addr) {
|
||||
ret = fdt_setprop_u64(dtb, off, FDT_PROP_INITRD_START,
|
||||
initrd_load_addr);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
ret = fdt_setprop_u64(dtb, off, FDT_PROP_INITRD_END,
|
||||
initrd_load_addr + initrd_len);
|
||||
if (ret)
|
||||
goto out;
|
||||
} else {
|
||||
ret = fdt_delprop(dtb, off, FDT_PROP_INITRD_START);
|
||||
if (ret && (ret != -FDT_ERR_NOTFOUND))
|
||||
goto out;
|
||||
|
||||
ret = fdt_delprop(dtb, off, FDT_PROP_INITRD_END);
|
||||
if (ret && (ret != -FDT_ERR_NOTFOUND))
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* add kaslr-seed */
|
||||
ret = fdt_delprop(dtb, off, FDT_PROP_KASLR_SEED);
|
||||
if (ret == -FDT_ERR_NOTFOUND)
|
||||
ret = 0;
|
||||
else if (ret)
|
||||
goto out;
|
||||
|
||||
if (rng_is_initialized()) {
|
||||
u64 seed = get_random_u64();
|
||||
ret = fdt_setprop_u64(dtb, off, FDT_PROP_KASLR_SEED, seed);
|
||||
if (ret)
|
||||
goto out;
|
||||
} else {
|
||||
pr_notice("RNG is not initialised: omitting \"%s\" property\n",
|
||||
FDT_PROP_KASLR_SEED);
|
||||
}
|
||||
|
||||
/* add rng-seed */
|
||||
if (rng_is_initialized()) {
|
||||
void *rng_seed;
|
||||
ret = fdt_setprop_placeholder(dtb, off, FDT_PROP_RNG_SEED,
|
||||
RNG_SEED_SIZE, &rng_seed);
|
||||
if (ret)
|
||||
goto out;
|
||||
get_random_bytes(rng_seed, RNG_SEED_SIZE);
|
||||
} else {
|
||||
pr_notice("RNG is not initialised: omitting \"%s\" property\n",
|
||||
FDT_PROP_RNG_SEED);
|
||||
}
|
||||
|
||||
out:
|
||||
if (ret)
|
||||
return (ret == -FDT_ERR_NOSPACE) ? -ENOMEM : -EINVAL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* More space needed so that we can add initrd, bootargs, kaslr-seed,
|
||||
* rng-seed, userable-memory-range and elfcorehdr.
|
||||
*/
|
||||
#define DTB_EXTRA_SPACE 0x1000
|
||||
|
||||
static int create_dtb(struct kimage *image,
|
||||
unsigned long initrd_load_addr, unsigned long initrd_len,
|
||||
char *cmdline, void **dtb)
|
||||
{
|
||||
void *buf;
|
||||
size_t buf_size;
|
||||
size_t cmdline_len;
|
||||
int ret;
|
||||
|
||||
cmdline_len = cmdline ? strlen(cmdline) : 0;
|
||||
buf_size = fdt_totalsize(initial_boot_params)
|
||||
+ cmdline_len + DTB_EXTRA_SPACE;
|
||||
|
||||
for (;;) {
|
||||
buf = vmalloc(buf_size);
|
||||
if (!buf)
|
||||
return -ENOMEM;
|
||||
|
||||
/* duplicate a device tree blob */
|
||||
ret = fdt_open_into(initial_boot_params, buf, buf_size);
|
||||
if (ret) {
|
||||
vfree(buf);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ret = setup_dtb(image, initrd_load_addr, initrd_len,
|
||||
cmdline, buf);
|
||||
if (ret) {
|
||||
vfree(buf);
|
||||
if (ret == -ENOMEM) {
|
||||
/* unlikely, but just in case */
|
||||
buf_size += DTB_EXTRA_SPACE;
|
||||
continue;
|
||||
} else {
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
/* trim it */
|
||||
fdt_pack(buf);
|
||||
*dtb = buf;
|
||||
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
static int prepare_elf_headers(void **addr, unsigned long *sz)
|
||||
{
|
||||
struct crash_mem *cmem;
|
||||
|
|
@ -314,12 +145,15 @@ int load_other_segments(struct kimage *image,
|
|||
}
|
||||
|
||||
/* load dtb */
|
||||
ret = create_dtb(image, initrd_load_addr, initrd_len, cmdline, &dtb);
|
||||
if (ret) {
|
||||
dtb = of_kexec_alloc_and_setup_fdt(image, initrd_load_addr,
|
||||
initrd_len, cmdline, 0);
|
||||
if (!dtb) {
|
||||
pr_err("Preparing for new dtb failed\n");
|
||||
goto out_err;
|
||||
}
|
||||
|
||||
/* trim it */
|
||||
fdt_pack(dtb);
|
||||
dtb_len = fdt_totalsize(dtb);
|
||||
kbuf.buffer = dtb;
|
||||
kbuf.bufsz = dtb_len;
|
||||
|
|
@ -343,6 +177,6 @@ int load_other_segments(struct kimage *image,
|
|||
|
||||
out_err:
|
||||
image->nr_segments = orig_segments;
|
||||
vfree(dtb);
|
||||
kvfree(dtb);
|
||||
return ret;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue