Some archs can have special memory regions, within the given memory
range, which can't be used for the buffer in a kexec segment. As
kexec_add_buffer() function is being called from generic code as well,
add weak arch_kexec_add_buffer definition for archs to override & take
care of special regions before trying to locate a memory hole.
Signed-off-by: Hari Bathini <hbathini@xxxxxxxxxxxxx>
---
include/linux/kexec.h | 5 +++++
kernel/kexec_file.c | 37 +++++++++++++++++++++++++++++++++----
2 files changed, 38 insertions(+), 4 deletions(-)
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 1776eb2..1237682 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -195,6 +195,11 @@ int __weak arch_kexec_apply_relocations(struct purgatory_info *pi,
const Elf_Shdr *relsec,
const Elf_Shdr *symtab);
+extern int arch_kexec_add_buffer(struct kexec_buf *kbuf);
+
+/* arch_kexec_add_buffer calls this when it is ready */
+extern int __kexec_add_buffer(struct kexec_buf *kbuf);
+
extern int kexec_add_buffer(struct kexec_buf *kbuf);
int kexec_locate_mem_hole(struct kexec_buf *kbuf);
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index bb05fd5..a0b4f7f 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -669,10 +669,6 @@ int kexec_locate_mem_hole(struct kexec_buf *kbuf)
*/
int kexec_add_buffer(struct kexec_buf *kbuf)
{
-
- struct kexec_segment *ksegment;
- int ret;
-
/* Currently adding segment this way is allowed only in file mode */
if (!kbuf->image->file_mode)
return -EINVAL;
@@ -696,6 +692,25 @@ int kexec_add_buffer(struct kexec_buf *kbuf)
kbuf->memsz = ALIGN(kbuf->memsz, PAGE_SIZE);
kbuf->buf_align = max(kbuf->buf_align, PAGE_SIZE);
+ return arch_kexec_add_buffer(kbuf);
+}
+
+/**
+ * __kexec_add_buffer - arch_kexec_add_buffer would call this function after
+ * updating kbuf, to place a buffer in a kexec segment.
+ * @kbuf: Buffer contents and memory parameters.
+ *
+ * This function assumes that kexec_mutex is held.
+ * On successful return, @kbuf->mem will have the physical address of
+ * the buffer in memory.
+ *
+ * Return: 0 on success, negative errno on error.
+ */
+int __kexec_add_buffer(struct kexec_buf *kbuf)
+{
+ struct kexec_segment *ksegment;
+ int ret;
+
/* Walk the RAM ranges and allocate a suitable range for the buffer */
ret = kexec_locate_mem_hole(kbuf);
if (ret)
@@ -711,6 +726,20 @@ int kexec_add_buffer(struct kexec_buf *kbuf)
return 0;
}
+/**
+ * arch_kexec_add_buffer - Some archs have memory regions within the given
+ * range that can't be used to place a kexec segment.
+ * Such archs can override this function to take care
+ * of them before trying to locate the memory hole.
+ * @kbuf: Buffer contents and memory parameters.
+ *
+ * Return: 0 on success, negative errno on error.
+ */
+int __weak arch_kexec_add_buffer(struct kexec_buf *kbuf)
+{
+ return __kexec_add_buffer(kbuf);
+}
+
/* Calculate and store the digest of segments */
static int kexec_calculate_store_digests(struct kimage *image)
{
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