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powerpc: 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 powerpc.

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/20210221174930.27324-8-nramas@linux.microsoft.com
This commit is contained in:
Rob Herring 2021-02-21 09:49:24 -08:00
parent ac10be5cdb
commit 3c985d31ad
4 changed files with 26 additions and 140 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/powerpc/include/asm/kexec.h
View File

@ -107,6 +107,7 @@ struct kimage_arch {
unsigned long backup_start;
void *backup_buf;
void *fdt;
#ifdef CONFIG_IMA_KEXEC
phys_addr_t ima_buffer_addr;

30
arch/powerpc/kexec/elf_64.c
View File

@ -19,6 +19,7 @@
#include <linux/kexec.h>
#include <linux/libfdt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/slab.h>
#include <linux/types.h>
@ -29,7 +30,6 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
unsigned long cmdline_len)
{
int ret;
unsigned int fdt_size;
unsigned long kernel_load_addr;
unsigned long initrd_load_addr = 0, fdt_load_addr;
void *fdt;
@ -102,15 +102,10 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
pr_debug("Loaded initrd at 0x%lx\n", initrd_load_addr);
}
fdt_size = kexec_fdt_totalsize_ppc64(image);
fdt = kmalloc(fdt_size, GFP_KERNEL);
fdt = of_kexec_alloc_and_setup_fdt(image, initrd_load_addr,
initrd_len, cmdline,
kexec_fdt_totalsize_ppc64(image));
if (!fdt) {
pr_err("Not enough memory for the device tree.\n");
ret = -ENOMEM;
goto out;
}
ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
if (ret < 0) {
pr_err("Error setting up the new device tree.\n");
ret = -EINVAL;
goto out;
@ -124,13 +119,17 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
fdt_pack(fdt);
kbuf.buffer = fdt;
kbuf.bufsz = kbuf.memsz = fdt_size;
kbuf.bufsz = kbuf.memsz = fdt_totalsize(fdt);
kbuf.buf_align = PAGE_SIZE;
kbuf.top_down = true;
kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
ret = kexec_add_buffer(&kbuf);
if (ret)
goto out;
/* FDT will be freed in arch_kimage_file_post_load_cleanup */
image->arch.fdt = fdt;
fdt_load_addr = kbuf.mem;
pr_debug("Loaded device tree at 0x%lx\n", fdt_load_addr);
@ -145,8 +144,15 @@ out:
kfree(modified_cmdline);
kexec_free_elf_info(&elf_info);
/* Make kimage_file_post_load_cleanup free the fdt buffer for us. */
return ret ? ERR_PTR(ret) : fdt;
/*
* Once FDT buffer has been successfully passed to kexec_add_buffer(),
* the FDT buffer address is saved in image->arch.fdt. In that case,
* the memory cannot be freed here in case of any other error.
*/
if (ret && !image->arch.fdt)
kvfree(fdt);
return ret ? ERR_PTR(ret) : NULL;
}
const struct kexec_file_ops kexec_elf64_ops = {

132
arch/powerpc/kexec/file_load.c
View File

@ -156,135 +156,11 @@ int setup_new_fdt(const struct kimage *image, void *fdt,
unsigned long initrd_load_addr, unsigned long initrd_len,
const char *cmdline)
{
int ret, chosen_node;
const void *prop;
int ret;
/* Remove memory reservation for the current device tree. */
ret = delete_fdt_mem_rsv(fdt, __pa(initial_boot_params),
fdt_totalsize(initial_boot_params));
if (ret == 0)
pr_debug("Removed old device tree reservation.\n");
else if (ret != -ENOENT)
return ret;
chosen_node = fdt_path_offset(fdt, "/chosen");
if (chosen_node == -FDT_ERR_NOTFOUND) {
chosen_node = fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"),
"chosen");
if (chosen_node < 0) {
pr_err("Error creating /chosen.\n");
return -EINVAL;
}
} else if (chosen_node < 0) {
pr_err("Malformed device tree: error reading /chosen.\n");
return -EINVAL;
}
/* Did we boot using an initrd? */
prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL);
if (prop) {
uint64_t tmp_start, tmp_end, tmp_size;
tmp_start = fdt64_to_cpu(*((const fdt64_t *) prop));
prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL);
if (!prop) {
pr_err("Malformed device tree.\n");
return -EINVAL;
}
tmp_end = fdt64_to_cpu(*((const fdt64_t *) prop));
/*
* kexec reserves exact initrd size, while firmware may
* reserve a multiple of PAGE_SIZE, so check for both.
*/
tmp_size = tmp_end - tmp_start;
ret = delete_fdt_mem_rsv(fdt, tmp_start, tmp_size);
if (ret == -ENOENT)
ret = delete_fdt_mem_rsv(fdt, tmp_start,
round_up(tmp_size, PAGE_SIZE));
if (ret == 0)
pr_debug("Removed old initrd reservation.\n");
else if (ret != -ENOENT)
return ret;
/* If there's no new initrd, delete the old initrd's info. */
if (initrd_len == 0) {
ret = fdt_delprop(fdt, chosen_node,
"linux,initrd-start");
if (ret) {
pr_err("Error deleting linux,initrd-start.\n");
return -EINVAL;
}
ret = fdt_delprop(fdt, chosen_node, "linux,initrd-end");
if (ret) {
pr_err("Error deleting linux,initrd-end.\n");
return -EINVAL;
}
}
}
if (initrd_len) {
ret = fdt_setprop_u64(fdt, chosen_node,
"linux,initrd-start",
initrd_load_addr);
if (ret < 0)
goto err;
/* initrd-end is the first address after the initrd image. */
ret = fdt_setprop_u64(fdt, chosen_node, "linux,initrd-end",
initrd_load_addr + initrd_len);
if (ret < 0)
goto err;
ret = fdt_add_mem_rsv(fdt, initrd_load_addr, initrd_len);
if (ret) {
pr_err("Error reserving initrd memory: %s\n",
fdt_strerror(ret));
return -EINVAL;
}
}
if (cmdline != NULL) {
ret = fdt_setprop_string(fdt, chosen_node, "bootargs", cmdline);
if (ret < 0)
goto err;
} else {
ret = fdt_delprop(fdt, chosen_node, "bootargs");
if (ret && ret != -FDT_ERR_NOTFOUND) {
pr_err("Error deleting bootargs.\n");
return -EINVAL;
}
}
if (image->type == KEXEC_TYPE_CRASH) {
/*
* Avoid elfcorehdr from being stomped on in kdump kernel by
* setting up memory reserve map.
*/
ret = fdt_add_mem_rsv(fdt, image->elf_load_addr,
image->elf_headers_sz);
if (ret) {
pr_err("Error reserving elfcorehdr memory: %s\n",
fdt_strerror(ret));
goto err;
}
}
ret = setup_ima_buffer(image, fdt, chosen_node);
if (ret) {
pr_err("Error setting up the new device tree.\n");
return ret;
}
ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));
if (ret)
goto err;
pr_err("Error setting up the new device tree.\n");
return 0;
err:
pr_err("Error setting up the new device tree.\n");
return -EINVAL;
return ret;
}

3
arch/powerpc/kexec/file_load_64.c
View File

@ -1146,5 +1146,8 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
image->elf_headers = NULL;
image->elf_headers_sz = 0;
kvfree(image->arch.fdt);
image->arch.fdt = NULL;
return kexec_image_post_load_cleanup_default(image);
}