[RFC PATCH 3/4] arm64: Use common of_kexec_setup_new_fdt()

From: Rob Herring <robh@kernel•org>
To: Lakshmi Ramasubramanian <nramas@linux•microsoft.com>,
	takahiro.akashi@linaro•org, will@kernel•org,
	catalin.marinas@arm•com, mpe@ellerman•id.au
Cc: mark.rutland@arm•com, benh@kernel•crashing.org,
	bhsharma@redhat•com, tao.li@vivo•com, zohar@linux•ibm.com,
	paulus@samba•org, vincenzo.frascino@arm•com,
	frowand.list@gmail•com, sashal@kernel•org, masahiroy@kernel•org,
	jmorris@namei•org, linux-arm-kernel@lists•infradead.org,
	serge@hallyn•com, devicetree@vger•kernel.org,
	pasha.tatashin@soleen•com, prsriva@linux•microsoft.com,
	hsinyi@chromium•org, allison@lohutok•net,
	christophe.leroy@c-s•fr, mbrugger@suse•com,
	balajib@linux•microsoft.com, dmitry.kasatkin@gmail•com,
	linux-kernel@vger•kernel.org, james.morse@arm•com,
	linux-integrity@vger•kernel.org,
	Thiago Jung Bauermann <bauerman@linux•ibm.com>
Subject: [RFC PATCH 3/4] arm64: Use common of_kexec_setup_new_fdt()
Date: Fri, 11 Dec 2020 16:10:05 -0600	[thread overview]
Message-ID: <20201211221006.1052453-4-robh@kernel.org> (raw)
In-Reply-To: <20201211221006.1052453-1-robh@kernel.org>

Signed-off-by: Rob Herring <robh@kernel•org>
---
 arch/arm64/kernel/machine_kexec_file.c | 123 +------------------------
 1 file changed, 3 insertions(+), 120 deletions(-)

diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
index 5b0e67b93cdc..7de9c47dee7c 100644
--- a/arch/arm64/kernel/machine_kexec_file.c
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -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,
@@ -50,112 +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->arch.elf_headers_mem,
-				image->arch.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.
@@ -185,8 +68,8 @@ static int create_dtb(struct kimage *image,
 		if (ret)
 			return -EINVAL;
 
-		ret = setup_dtb(image, initrd_load_addr, initrd_len,
-				cmdline, buf);
+		ret = of_kexec_setup_new_fdt(image, buf, initrd_load_addr,
+					     initrd_len, cmdline);
 		if (ret) {
 			vfree(buf);
 			if (ret == -ENOMEM) {
-- 
2.25.1


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