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arm64: Use common of_kexec_alloc_and_setup_fdt()

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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 2021-02-21 09:49:23 -08:00
parent b30be4dc73
commit ac10be5cdb
1 changed files with 8 additions and 174 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

182
arch/arm64/kernel/machine_kexec_file.c
View file

@ -15,23 +15,12 @@
#include <linux/kexec.h> #include <linux/kexec.h>
#include <linux/libfdt.h> #include <linux/libfdt.h>
#include <linux/memblock.h> #include <linux/memblock.h>
#include <linux/of.h>
#include <linux/of_fdt.h> #include <linux/of_fdt.h>
#include <linux/random.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/string.h> #include <linux/string.h>
#include <linux/types.h> #include <linux/types.h>
#include <linux/vmalloc.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[] = { const struct kexec_file_ops * const kexec_file_loaders[] = {
&kexec_image_ops, &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) int arch_kimage_file_post_load_cleanup(struct kimage *image)
{ {
vfree(image->arch.dtb); kvfree(image->arch.dtb);
image->arch.dtb = NULL; image->arch.dtb = NULL;
vfree(image->elf_headers); 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); 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) static int prepare_elf_headers(void **addr, unsigned long *sz)
{ {
struct crash_mem *cmem; struct crash_mem *cmem;
@ -314,12 +145,15 @@ int load_other_segments(struct kimage *image,
} }
/* load dtb */ /* load dtb */
ret = create_dtb(image, initrd_load_addr, initrd_len, cmdline, &dtb); dtb = of_kexec_alloc_and_setup_fdt(image, initrd_load_addr,
if (ret) { initrd_len, cmdline, 0);
if (!dtb) {
pr_err("Preparing for new dtb failed\n"); pr_err("Preparing for new dtb failed\n");
goto out_err; goto out_err;
} }
/* trim it */
fdt_pack(dtb);
dtb_len = fdt_totalsize(dtb); dtb_len = fdt_totalsize(dtb);
kbuf.buffer = dtb; kbuf.buffer = dtb;
kbuf.bufsz = dtb_len; kbuf.bufsz = dtb_len;
@ -343,6 +177,6 @@ int load_other_segments(struct kimage *image,
out_err: out_err:
image->nr_segments = orig_segments; image->nr_segments = orig_segments;
vfree(dtb); kvfree(dtb);
return ret; return ret;
} }