[PATCH] makedumpfile: Add initial mips64 support
Youling Tang
tangyouling at loongson.cn
Mon Jan 18 20:17:26 EST 2021
Patch adds support for mips64 in makedumpfile. It takes care of vmalloc,
module and directly map kernel memory region's translation. Currently we
only support 3 leverl 16K pages and VA_BITS as 48.
The changes were tested on a mips64 Loongson-3A4000 processor. The dump
compression and filtering (for all dump levels 1,2,4,8,16 and 31) tests
are succussfull.
Signed-off-by: Huacai Chen <chenhuacai at loongson.cn>
Signed-off-by: Jinyang He <hejinyang at loongson.cn>
Signed-off-by: Youling Tang <tangyouling at loongson.cn>
---
Makefile | 2 +-
arch/mips64.c | 113 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
makedumpfile.h | 54 +++++++++++++++++++++++++++
3 files changed, 168 insertions(+), 1 deletion(-)
create mode 100644 arch/mips64.c
diff --git a/Makefile b/Makefile
index cb6bd42..6f8ade0 100644
--- a/Makefile
+++ b/Makefile
@@ -47,7 +47,7 @@ endif
SRC_BASE = makedumpfile.c makedumpfile.h diskdump_mod.h sadump_mod.h sadump_info.h
SRC_PART = print_info.c dwarf_info.c elf_info.c erase_info.c sadump_info.c cache.c tools.c printk.c
OBJ_PART=$(patsubst %.c,%.o,$(SRC_PART))
-SRC_ARCH = arch/arm.c arch/arm64.c arch/x86.c arch/x86_64.c arch/ia64.c arch/ppc64.c arch/s390x.c arch/ppc.c arch/sparc64.c
+SRC_ARCH = arch/arm.c arch/arm64.c arch/x86.c arch/x86_64.c arch/ia64.c arch/ppc64.c arch/s390x.c arch/ppc.c arch/sparc64.c arch/mips64.c
OBJ_ARCH=$(patsubst %.c,%.o,$(SRC_ARCH))
LIBS = -ldw -lbz2 -ldl -lelf -lz
diff --git a/arch/mips64.c b/arch/mips64.c
new file mode 100644
index 0000000..18a9e05
--- /dev/null
+++ b/arch/mips64.c
@@ -0,0 +1,113 @@
+/*
+ * mips64.c
+ *
+ * Copyright (C) 2021 Loongson Technology Co., Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation (version 2 of the License).
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#ifdef __mips64__
+
+#include "../print_info.h"
+#include "../elf_info.h"
+#include "../makedumpfile.h"
+
+int
+get_phys_base_mips64(void)
+{
+ info->phys_base = 0ULL;
+
+ DEBUG_MSG("phys_base : %lx\n", info->phys_base);
+
+ return TRUE;
+}
+
+int
+get_versiondep_info_mips64(void)
+{
+ info->page_offset = 0x9800000000000000ULL;
+ info->max_physmem_bits = _MAX_PHYSMEM_BITS;
+ info->section_size_bits = _SECTION_SIZE_BITS;
+
+ DEBUG_MSG("page_offset : %lx\n", info->page_offset);
+ DEBUG_MSG("max_physmem_bits : %lx\n", info->max_physmem_bits);
+ DEBUG_MSG("section_size_bits: %lx\n", info->section_size_bits);
+
+ return TRUE;
+}
+
+/*
+ * Translate a virtual address to a physical address by using 3 levels paging.
+ */
+unsigned long long
+vaddr_to_paddr_mips64(unsigned long vaddr)
+{
+ unsigned long long paddr = NOT_PADDR;
+ pgd_t *pgda, pgdv;
+ pmd_t *pmda, pmdv;
+ pte_t *ptea, ptev;
+
+ /*
+ * CKSEG0/CKSEG1
+ */
+ if (vaddr >= 0xffffffff80000000ULL && vaddr < 0xffffffffc0000000ULL)
+ return vaddr & 0x1fffffffULL;
+
+ /*
+ * XKPHYS
+ */
+ if (vaddr >= 0x9000000000000000ULL && vaddr < 0xc000000000000000ULL)
+ return vaddr & ((1ULL << MAX_PHYSMEM_BITS()) - 1);
+
+ if (SYMBOL(swapper_pg_dir) == NOT_FOUND_SYMBOL) {
+ ERRMSG("Can't get the symbol of swapper_pg_dir.\n");
+ return NOT_PADDR;
+ }
+
+ pgda = pgd_offset(SYMBOL(swapper_pg_dir), vaddr);
+ if (!readmem(PADDR, (unsigned long long)pgda, &pgdv, sizeof(pgdv))) {
+ ERRMSG("Can't read pgd\n");
+ return NOT_PADDR;
+ }
+
+ pmda = pmd_offset(&pgdv, vaddr);
+ if (!readmem(PADDR, (unsigned long long)pmda, &pmdv, sizeof(pmdv))) {
+ ERRMSG("Can't read pmd\n");
+ return NOT_PADDR;
+ }
+
+ switch (pmdv & (_PAGE_PRESENT|_PAGE_HUGE)) {
+ case _PAGE_PRESENT:
+ ptea = pte_offset(&pmdv, vaddr);
+ /* 64k page */
+ if (!readmem(PADDR, (unsigned long long)ptea, &ptev, sizeof(ptev))) {
+ ERRMSG("Can't read pte\n");
+ return NOT_PADDR;
+ }
+
+ if (!(ptev & _PAGE_PRESENT)) {
+ ERRMSG("Can't get a valid pte.\n");
+ return NOT_PADDR;
+ } else {
+ paddr = PAGEBASE(ptev) + (vaddr & (PAGESIZE() - 1));
+ }
+ break;
+ case _PAGE_PRESENT|_PAGE_HUGE:
+ paddr = (pmdv & PMD_MASK) + (vaddr & (PMD_SIZE - 1));
+ break;
+ }
+
+ return paddr;
+}
+
+#endif /* mips64 */
diff --git a/makedumpfile.h b/makedumpfile.h
index 5f50080..bc86bf2 100644
--- a/makedumpfile.h
+++ b/makedumpfile.h
@@ -958,6 +958,39 @@ typedef unsigned long pgd_t;
#endif /* sparc64 */
+#ifdef __mips64__ /* mips64 */
+#define KVBASE PAGE_OFFSET
+#define _SECTION_SIZE_BITS (28)
+#define _MAX_PHYSMEM_BITS (48)
+#define _PAGE_PRESENT (1 << 0)
+#define _PAGE_HUGE (1 << 4)
+
+typedef unsigned long pte_t;
+typedef unsigned long pmd_t;
+typedef unsigned long pgd_t;
+
+#define PAGE_MASK (~(PAGESIZE() - 1))
+#define PMD_MASK (~(PMD_SIZE - 1))
+#define PMD_SHIFT ((PAGESHIFT() - 3) * 2 + 3)
+#define PMD_SIZE (1UL << PMD_SHIFT)
+#define PGDIR_SHIFT ((PAGESHIFT() - 3) * 3 + 3)
+#define PTRS_PER_PTE (1 << (PAGESHIFT() - 3))
+#define PTRS_PER_PMD PTRS_PER_PTE
+#define PTRS_PER_PGD PTRS_PER_PTE
+
+#define pte_index(vaddr) (((vaddr) >> PAGESHIFT()) & (PTRS_PER_PTE - 1))
+#define pmd_page_paddr(pmd) (pmd & (int32_t)PAGE_MASK)
+#define pte_offset(dir, vaddr) ((pte_t *)pmd_page_paddr((*dir)) + pte_index(vaddr))
+
+#define pmd_index(vaddr) (((vaddr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
+#define pgd_page_paddr(pgd) (pgd & (int32_t)PAGE_MASK)
+#define pmd_offset(pgd, vaddr) ((pmd_t *)pgd_page_paddr((*pgd)) + pmd_index(vaddr))
+
+#define pgd_index(vaddr) (((vaddr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
+#define pgd_offset(pgdir, vaddr) ((pgd_t *)(pgdir) + pgd_index(vaddr))
+
+#endif /* mips64 */
+
/*
* The function of dependence on machine
*/
@@ -1112,6 +1145,21 @@ unsigned long long vaddr_to_paddr_sparc64(unsigned long vaddr);
#define arch_crashkernel_mem_size() stub_false()
#endif /* sparc64 */
+#ifdef __mips64__ /* mips64 */
+int get_phys_base_mips64(void);
+int get_versiondep_info_mips64(void);
+unsigned long long vaddr_to_paddr_mips64(unsigned long vaddr);
+#define find_vmemmap() stub_false()
+#define get_phys_base() get_phys_base_mips64()
+#define get_machdep_info() stub_true()
+#define get_versiondep_info() get_versiondep_info_mips64()
+#define get_kaslr_offset(X) stub_false()
+#define vaddr_to_paddr(X) vaddr_to_paddr_mips64(X)
+#define paddr_to_vaddr(X) paddr_to_vaddr_general(X)
+#define is_phys_addr(X) stub_true_ul(X)
+#define arch_crashkernel_mem_size() stub_false()
+#endif /* mips64 */
+
typedef unsigned long long mdf_pfn_t;
#ifndef ARCH_PFN_OFFSET
@@ -2228,6 +2276,12 @@ int get_xen_info_ia64(void);
#define get_xen_info_arch(X) FALSE
#endif /* sparc64 */
+#ifdef __mips64__ /* mips64 */
+#define kvtop_xen(X) FALSE
+#define get_xen_basic_info_arch(X) FALSE
+#define get_xen_info_arch(X) FALSE
+#endif /* mips64 */
+
struct cycle {
mdf_pfn_t start_pfn;
mdf_pfn_t end_pfn;
--
2.1.0
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