[RFC PATCH 4/4] powerpc: 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 4/4] powerpc: Use common of_kexec_setup_new_fdt()
Date: Fri, 11 Dec 2020 16:10:06 -0600	[thread overview]
Message-ID: <20201211221006.1052453-5-robh@kernel.org> (raw)
In-Reply-To: <20201211221006.1052453-1-robh@kernel.org>

Signed-off-by: Rob Herring <robh@kernel.org>
---

After the IMA changes, delete_fdt_mem_rsv() can also be removed.

 arch/powerpc/kexec/file_load.c | 125 ++-------------------------------
 1 file changed, 6 insertions(+), 119 deletions(-)

diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
index e452b11df631..956bcb2d1ec2 100644
--- a/arch/powerpc/kexec/file_load.c
+++ b/arch/powerpc/kexec/file_load.c
@@ -16,6 +16,7 @@

 #include <linux/slab.h>
 #include <linux/kexec.h>
+#include <linux/of.h>
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
 #include <asm/setup.h>
@@ -156,132 +157,18 @@ 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;
-
-	/* 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;
-		}
-	}
+	int ret;

-	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->arch.elf_headers_mem,
-				      image->arch.elf_headers_sz);
-		if (ret) {
-			pr_err("Error reserving elfcorehdr memory: %s\n",
-			       fdt_strerror(ret));
-			goto err;
-		}
-	}
+	ret = of_kexec_setup_new_fdt(image, fdt, initrd_load_addr, initrd_len, cmdline);
+	if (ret)
+		goto err;

-	ret = setup_ima_buffer(image, fdt, chosen_node);
+	ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));
 	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);
-	if (ret)
-		goto err;
-
 	return 0;

 err:
--
2.25.1

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