kexec: ARM: fix align issue of add_buffer_phys_virt() for LPAE kernel

If LPAE is enabled, 3 level page table is used and the 'SECTION_SIZE'
is (1<<21), so add_buffer_phys_virt() should align to (1 << 21).

(From OE-Core rev: 582cad510953d3540ffe35b10b1ce2a8d034b535)

Signed-off-by: Haiqing Bai <Haiqing.Bai@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 53 insertions, 0 deletions

diff --git a/meta/recipes-kernel/kexec/kexec-tools/0010-kexec-ARM-Fix-add_buffer_phys_virt-align-issue.patch b/meta/recipes-kernel/kexec/kexec-tools/0010-kexec-ARM-Fix-add_buffer_phys_virt-align-issue.patch
new file mode 100644
index 0000000000..6c6c66d885
--- /dev/null
+++ b/meta/recipes-kernel/kexec/kexec-tools/0010-kexec-ARM-Fix-add_buffer_phys_virt-align-issue.patch
@@ -0,0 +1,52 @@
+From 78e497fb69950665e639cfab8f4fb50cc404a1eb Mon Sep 17 00:00:00 2001
+From: Haiqing Bai <Haiqing.Bai@windriver.com>
+Date: Mon, 9 Jan 2017 15:26:29 +0800
+Subject: [PATCH] kexec: ARM: Fix add_buffer_phys_virt() align issue
+
+When "CONFIG_ARM_LPAE" is enabled,3 level page table
+is used by MMU, the "SECTION_SIZE" is defined with
+(1 << 21), but 'add_buffer_phys_virt()' hardcode this
+to (1 << 20).
+
+Upstream-Status: Pending
+
+Suggested-By:fredrik.markstrom@gmail.com
+Signed-off-by: Haiqing Bai <Haiqing.Bai@windriver.com>
+---
+ kexec/arch/arm/crashdump-arm.c | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/kexec/arch/arm/crashdump-arm.c b/kexec/arch/arm/crashdump-arm.c
+index 245c21a..12139c3 100644
+--- a/kexec/arch/arm/crashdump-arm.c
++++ b/kexec/arch/arm/crashdump-arm.c
+@@ -240,6 +240,7 @@ int load_crashdump_segments(struct kexec_info *info, char *mod_cmdline)
+        void *buf;
+        int err;
+        int last_ranges;
++       unsigned short align_bit_shift = 20;
+ 
+        /*
+         * First fetch all the memory (RAM) ranges that we are going to pass to
+@@ -281,6 +282,7 @@ int load_crashdump_segments(struct kexec_info *info, char *mod_cmdline)
+ 
+                /* for support LPAE enabled kernel*/
+                elf_info.class = ELFCLASS64;
++               align_bit_shift = 21;
+ 
+                err = crash_create_elf64_headers(info, &elf_info,
+                                         usablemem_rgns.ranges,
+@@ -302,8 +304,9 @@ int load_crashdump_segments(struct kexec_info *info, char *mod_cmdline)
+         * 1MB) so that available memory passed in kernel command line will be
+         * aligned to 1MB. This is because kernel create_mapping() wants memory
+         * regions to be aligned to SECTION_SIZE.
++        * The SECTION_SIZE of LPAE kernel is '1UL << 21' defined in pgtable-3level.h
+         */
+-       elfcorehdr = add_buffer_phys_virt(info, buf, bufsz, bufsz, 1 << 20,
++       elfcorehdr = add_buffer_phys_virt(info, buf, bufsz, bufsz, 1 << align_bit_shift,
+                                          crash_kernel_mem.start,
+                                          crash_kernel_mem.end, -1, 0);
+ 
+-- 
+1.9.1
+
diff --git a/meta/recipes-kernel/kexec/kexec-tools_2.0.14.bb b/meta/recipes-kernel/kexec/kexec-tools_2.0.14.bb
index 899b391ecf..af323207f0 100644
--- a/meta/recipes-kernel/kexec/kexec-tools_2.0.14.bb
+++ b/meta/recipes-kernel/kexec/kexec-tools_2.0.14.bb
@@ -15,6 +15,7 @@ SRC_URI += "${KERNELORG_MIRROR}/linux/utils/kernel/kexec/kexec-tools-${PV}.tar.g
             file://0007-arm64-kdump-set-up-other-segments.patch \
             file://0008-arm64-kdump-add-DT-properties-to-crash-dump-kernel-s.patch \
             file://0009-arm64-kdump-Add-support-for-binary-image-files.patch \
+            file://0010-kexec-ARM-Fix-add_buffer_phys_virt-align-issue.patch \
          "
 
 SRC_URI[md5sum] = "b2b2c5e6b29d467d6e99d587fb6b7cf5"