kexec-tools/files/363087cd156f870dfd07fef04077696daa77acaa.patch

From 363087cd156f870dfd07fef04077696daa77acaa Mon Sep 17 00:00:00 2001
From: Song Shuai <songshuaishuai@tinylab.org>
Date: Tue, 22 Apr 2025 18:22:59 +0200
Subject: [PATCH] RISC-V: Separate elf_riscv_find_pbase out

The is the preparative patch for RISC-V kexec Image file support.

Separate the elf_riscv_find_pbase() function out to
allow kernel_load syscall load Image binary file.

Signed-off-by: Song Shuai <songshuaishuai@tinylab.org>
Signed-off-by: Simon Horman <horms@kernel.org>
---
 kexec/arch/riscv/kexec-elf-riscv.c | 72 +-----------------------------
 kexec/arch/riscv/kexec-riscv.c     | 55 +++++++++++++++++++++++
 kexec/arch/riscv/kexec-riscv.h     | 13 ++++++
 3 files changed, 69 insertions(+), 71 deletions(-)

diff --git a/kexec/arch/riscv/kexec-elf-riscv.c b/kexec/arch/riscv/kexec-elf-riscv.c
index 2b9f66d7..434873cf 100644
--- a/kexec/arch/riscv/kexec-elf-riscv.c
+++ b/kexec/arch/riscv/kexec-elf-riscv.c
@@ -12,76 +12,6 @@
 #include "kexec-syscall.h"	/* For KEXEC_ON_CRASH */
 #include "kexec-riscv.h"
 
-
-/*********\
-* HELPERS *
-\*********/
-
-/*
- * Go through the available physical memory regions and
- * find one that can hold an image of the specified size.
- * Note: This is called after get_memory_ranges so
- * info->memory_range[] should be populated. Also note that
- * memory ranges are sorted, so we'll return the first region
- * that's big enough for holding the image.
- */
-static int elf_riscv_find_pbase(struct kexec_info *info, off_t *addr,
-				off_t size)
-{
-	int i = 0;
-	off_t start = 0;
-	off_t end = 0;
-	int ret = 0;
-
-	/*
-	 * If this image is for a crash kernel, use the region
-	 * the primary kernel has already reserved for us.
-	 */
-	if (info->kexec_flags & KEXEC_ON_CRASH) {
-		ret = get_crash_kernel_load_range((uint64_t *) &start,
-						  (uint64_t *) &end);
-		if (!ret) {
-			/*
-			 * Kernel should be aligned to the nearest
-			 * hugepage (2MB for RV64, 4MB for RV32).
-			 */
-#if __riscv_xlen == 64
-			start = _ALIGN_UP(start, 0x200000);
-#else
-			start = _ALIGN_UP(start, 0x400000);
-#endif
-			if (end > start && ((end - start) >= size)) {
-				*addr = start;
-				return 0;
-			}
-
-			return -EFBIG;
-		} else
-			return ENOCRASHKERNEL;
-	}
-
-	for (i = 0; i < info->memory_ranges; i++) {
-		if (info->memory_range[i].type != RANGE_RAM)
-			continue;
-
-		start = info->memory_range[i].start;
-		end = info->memory_range[i].end;
-
-#if __riscv_xlen == 64
-		start = _ALIGN_UP(start, 0x200000);
-#else
-		start = _ALIGN_UP(start, 0x400000);
-#endif
-
-		if (end > start && ((end - start) >= size)) {
-			*addr = start;
-			return 0;
-		}
-	}
-
-	return -EFBIG;
-}
-
 /**************\
 * ENTRY POINTS *
 \**************/
@@ -182,7 +112,7 @@ int elf_riscv_load(int argc, char **argv, const char *buf, off_t len,
 		  kernel_size / 1024, old_base_addr, old_start_addr);
 
 	/* Get a continuous physical region that can hold the kernel */
-	ret = elf_riscv_find_pbase(info, &new_base_addr, kernel_size);
+	ret = riscv_find_pbase(info, &new_base_addr, kernel_size, KERNEL_ALIGN);
 	if (ret < 0) {
 		fprintf(stderr, "Could not find a memory region for the "
 				"provided ELF image\n");
diff --git a/kexec/arch/riscv/kexec-riscv.c b/kexec/arch/riscv/kexec-riscv.c
index bbc25c5c..63165930 100644
--- a/kexec/arch/riscv/kexec-riscv.c
+++ b/kexec/arch/riscv/kexec-riscv.c
@@ -50,6 +50,61 @@ static struct fdt_image provided_fdt = {0};
 * COMMON HELPERS *
 \****************/
 
+/*
+ * Go through the available physical memory regions and
+ * find one that can hold an image of the specified size
+ * and start address should be aligned up with `align`.
+ * Note: This is called after get_memory_ranges so
+ * info->memory_range[] should be populated. Also note that
+ * memory ranges are sorted, so we'll return the first region
+ * that's big enough for holding the image.
+ */
+int riscv_find_pbase(struct kexec_info *info, off_t *addr,
+				off_t size, off_t align)
+{
+	int i = 0;
+	off_t start = 0;
+	off_t end = 0;
+	int ret = 0;
+
+	/*
+	 * If this image is for a crash kernel, use the region
+	 * the primary kernel has already reserved for us.
+	 */
+	if (info->kexec_flags & KEXEC_ON_CRASH) {
+		ret = get_crash_kernel_load_range((uint64_t *) &start,
+						  (uint64_t *) &end);
+		if (!ret) {
+			start = _ALIGN_UP(start, align);
+
+			if (end > start && ((end - start) >= size)) {
+				*addr = start;
+				return 0;
+			}
+
+			return -EFBIG;
+		} else
+			return ENOCRASHKERNEL;
+	}
+
+	for (i = 0; i < info->memory_ranges; i++) {
+		if (info->memory_range[i].type != RANGE_RAM)
+			continue;
+
+		start = info->memory_range[i].start;
+		end = info->memory_range[i].end;
+
+		start = _ALIGN_UP(start, align);
+
+		if (end > start && ((end - start) >= size)) {
+			*addr = start;
+			return 0;
+		}
+	}
+
+	return -EFBIG;
+}
+
 int load_extra_segments(struct kexec_info *info, uint64_t kernel_base,
 			uint64_t kernel_size, uint64_t max_addr)
 {
diff --git a/kexec/arch/riscv/kexec-riscv.h b/kexec/arch/riscv/kexec-riscv.h
index f136c7ea..61809929 100644
--- a/kexec/arch/riscv/kexec-riscv.h
+++ b/kexec/arch/riscv/kexec-riscv.h
@@ -4,6 +4,17 @@
  *              Nick Kossifidis <mick@ics.forth.gr>
  */
 
+/*
+ * Kernel should be aligned to the nearest
+ * hugepage (2MB for RV64, 4MB for RV32).
+ */
+
+#if __riscv_xlen == 64
+#define KERNEL_ALIGN 0x200000
+#else
+#define KERNEL_ALIGN 0x400000
+#endif
+
 struct fdt_image {
 	char	*buf;
 	off_t	size;
@@ -26,6 +37,8 @@ int load_elfcorehdr(struct kexec_info *info);
 int prepare_kexec_file_options(struct kexec_info *info);
 int load_extra_segments(struct kexec_info *info, uint64_t kernel_base,
 			uint64_t kernel_size, uint64_t max_addr);
+int riscv_find_pbase(struct kexec_info *info, off_t *addr,
+				off_t size, off_t align);
 
 int elf_riscv_probe(const char *buf, off_t len);
 void elf_riscv_usage(void);