From 3c985d31ad661a2cc0ad0a55105046fc56a7b1fd Mon Sep 17 00:00:00 2001 From: Rob Herring Date: Sun, 21 Feb 2021 09:49:24 -0800 Subject: [PATCH] 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 Signed-off-by: Lakshmi Ramasubramanian Reviewed-by: Thiago Jung Bauermann Signed-off-by: Rob Herring Link: https://lore.kernel.org/r/20210221174930.27324-8-nramas@linux.microsoft.com --- arch/powerpc/include/asm/kexec.h | 1 + arch/powerpc/kexec/elf_64.c | 30 ++++--- arch/powerpc/kexec/file_load.c | 132 +----------------------------- arch/powerpc/kexec/file_load_64.c | 3 + 4 files changed, 26 insertions(+), 140 deletions(-) diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h index 75eb35c361b1..33d628084b3c 100644 --- a/arch/powerpc/include/asm/kexec.h +++ b/arch/powerpc/include/asm/kexec.h @@ -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; diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c index 9842e33533df..0492ca6003f3 100644 --- a/arch/powerpc/kexec/elf_64.c +++ b/arch/powerpc/kexec/elf_64.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -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 = { diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c index 19d2c5f49daf..c6bbd06d13e2 100644 --- a/arch/powerpc/kexec/file_load.c +++ b/arch/powerpc/kexec/file_load.c @@ -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; } diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c index 836099154604..dff207cfa59b 100644 --- a/arch/powerpc/kexec/file_load_64.c +++ b/arch/powerpc/kexec/file_load_64.c @@ -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); }