[PATCH] makedumpfile: Support ARM64
Pratyush Anand
panand at redhat.com
Fri May 15 11:30:06 PDT 2015
Patch adds support for ARM64 in makedumpfile. It takes care of vmalloc,
vmemmap, module and directly map kernel memory region's translation.
Currently we only support 2 leverl 64K pages and VA_BITS as 42. Support
to find these machine specific parameters dynamically and then to act
accordingly can be added latter.
Signed-off-by: Pratyush Anand <panand at redhat.com>
---
Makefile | 1 +
arch/arm64.c | 255 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
makedumpfile.h | 48 +++++++++++
3 files changed, 304 insertions(+)
create mode 100644 arch/arm64.c
diff --git a/Makefile b/Makefile
index 2d2b1b72929a..fc21a3f0e50a 100644
--- a/Makefile
+++ b/Makefile
@@ -49,6 +49,7 @@ SRC_BASE = makedumpfile.c makedumpfile.h diskdump_mod.h sadump_mod.h sadump_info
SRC_PART = print_info.c dwarf_info.c elf_info.c erase_info.c sadump_info.c cache.c
OBJ_PART=$(patsubst %.c,%.o,$(SRC_PART))
SRC_ARCH = arch/arm.c arch/x86.c arch/x86_64.c arch/ia64.c arch/ppc64.c arch/s390x.c arch/ppc.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
OBJ_ARCH=$(patsubst %.c,%.o,$(SRC_ARCH))
LIBS = -ldw -lbz2 -lebl -ldl -lelf -lz
diff --git a/arch/arm64.c b/arch/arm64.c
new file mode 100644
index 000000000000..23aabf09b332
--- /dev/null
+++ b/arch/arm64.c
@@ -0,0 +1,255 @@
+/*
+ * arch/arm64.c : Based on arch/arm.c
+ *
+ * Copyright (C) 2015 Red Hat, Pratyush Anand <panand at redhat.com>
+ *
+ * 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 __aarch64__
+
+#include "../elf_info.h"
+#include "../makedumpfile.h"
+#include "../print_info.h"
+
+#if CONFIG_ARM64_PGTABLE_LEVELS == 2
+typedef struct {
+ unsigned long pgd;
+} pgd_t;
+
+typedef struct {
+ pgd_t pgd;
+} pud_t;
+
+typedef struct {
+ pud_t pud;
+} pmd_t;
+
+#define pud_offset(pgd, vaddr) ((pud_t *)pgd)
+#define pmd_offset(pud, vaddr) ((pmd_t *)pud)
+#define pgd_val(x) ((x).pgd)
+#define pud_val(x) (pgd_val((x).pgd))
+#define pmd_val(x) (pud_val((x).pud))
+
+#define PUD_SHIFT PGDIR_SHIFT
+#define PUD_SIZE (1UL << PUD_SHIFT)
+
+#endif
+
+typedef struct {
+ unsigned long pte;
+} pte_t;
+#define pte_val(x) ((x).pte)
+
+#define PAGE_SIZE (1UL << PAGE_SHIFT)
+#define PAGE_MASK (~(PAGE_SIZE - 1))
+#define PGDIR_SHIFT ((PAGE_SHIFT - 3) * ARM64_PGTABLE_LEVELS + 3)
+#define PTRS_PER_PGD (1 << (VA_BITS - PGDIR_SHIFT))
+#define PMD_SHIFT ((PAGE_SHIFT - 3) * 2 + 3)
+#define PTRS_PER_PTE (1 << (PAGE_SHIFT - 3))
+#define PMD_SHIFT ((PAGE_SHIFT - 3) * 2 + 3)
+#define PMD_SIZE (1UL << PMD_SHIFT)
+#define PMD_MASK (~(PMD_SIZE - 1))
+#define PTRS_PER_PMD PTRS_PER_PTE
+
+#define PAGE_PRESENT (1 << 0)
+#define SECTIONS_SIZE_BITS 30
+/*
+
+* Highest possible physical address supported.
+*/
+#define PHYS_MASK_SHIFT 48
+#define PHYS_MASK ((1UL << PHYS_MASK_SHIFT) - 1)
+
+#define PMD_TYPE_MASK 3
+#define PMD_TYPE_SECT 1
+#define PMD_TYPE_TABLE 3
+
+#define __va(paddr) ((paddr) - info->phys_base + PAGE_OFFSET)
+#define __pa(vaddr) ((vaddr) - PAGE_OFFSET + info->phys_base)
+
+#define pgd_index(vaddr) (((vaddr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
+#define pgd_offset(pgdir, vaddr) ((pgd_t *)(pgdir) + pgd_index(vaddr))
+
+#define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
+#define pmd_page_vaddr(pmd) (__va(pmd_val(pmd) & PHYS_MASK & (int32_t)PAGE_MASK))
+#define pte_offset(dir, vaddr) ((pte_t*)pmd_page_vaddr((*dir)) + pte_index(vaddr))
+
+/* kernel struct page size can be kernel version dependent, currently
+ * keep it constant.
+ */
+#define KERN_STRUCT_PAGE_SIZE 64
+#define ALIGN(x, a) (((x) + (a) - 1) & ~((a) - 1))
+#define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
+#define VMEMMAP_SIZE ALIGN((1UL << (VA_BITS - PAGE_SHIFT)) * KERN_STRUCT_PAGE_SIZE, PUD_SIZE)
+#define MODULES_END PAGE_OFFSET
+#define MODULES_VADDR (MODULES_END - 0x4000000)
+
+
+static int is_vtop_from_page_table_arm64(unsigned long vaddr)
+{
+ /* If virtual address lies in vmalloc, vmemmap or module space
+ * region then, get the physical address from page table.
+ */
+ return ((vaddr >= VMALLOC_START && vaddr <= VMALLOC_END)
+ || (vaddr >= VMEMMAP_START && vaddr <= VMEMMAP_END)
+ || (vaddr >= MODULES_VADDR && vaddr <= MODULES_END));
+}
+
+int get_phys_base_arm64(void)
+{
+ unsigned long phys_base = ULONG_MAX;
+ unsigned long long phys_start;
+ int i;
+ /*
+ * We resolve phys_base from PT_LOAD segments. LMA contains physical
+ * address of the segment, and we use the lowest start as
+ * phys_base.
+ */
+ for (i = 0; get_pt_load(i, &phys_start, NULL, NULL, NULL); i++) {
+ if (phys_start < phys_base)
+ phys_base = phys_start;
+ }
+
+ if (phys_base == ULONG_MAX) {
+ ERRMSG("Can't determine phys_base\n");
+ return FALSE;
+ }
+
+ info->phys_base = phys_base;
+
+ DEBUG_MSG("phys_base : %lx\n", phys_base);
+
+ return TRUE;
+}
+
+int get_machdep_info_arm64(void)
+{
+ info->max_physmem_bits = PHYS_MASK_SHIFT;
+ info->section_size_bits = SECTIONS_SIZE_BITS;
+ info->page_offset = KVBASE;
+ info->vmalloc_start = 0xffffffffffffffffUL << VA_BITS;
+ info->vmalloc_end = PAGE_OFFSET - PUD_SIZE - VMEMMAP_SIZE - 0x10000;
+ info->vmemmap_start = VMALLOC_END + 0x10000;
+ info->vmemmap_end = VMEMMAP_START + VMEMMAP_SIZE;
+
+ DEBUG_MSG("max_physmem_bits : %lx\n", info->max_physmem_bits);
+ DEBUG_MSG("section_size_bits: %lx\n", info->section_size_bits);
+ DEBUG_MSG("page_offset : %lx\n", info->page_offset);
+ DEBUG_MSG("vmalloc_start : %lx\n", info->vmalloc_start);
+ DEBUG_MSG("vmalloc_end : %lx\n", info->vmalloc_end);
+ DEBUG_MSG("vmemmap_start : %lx\n", info->vmemmap_start);
+ DEBUG_MSG("vmemmap_end : %lx\n", info->vmemmap_end);
+ DEBUG_MSG("modules_start : %lx\n", MODULES_VADDR);
+ DEBUG_MSG("modules_end : %lx\n", MODULES_END);
+
+ return TRUE;
+}
+
+unsigned long long kvtop_xen_arm64(unsigned long kvaddr)
+{
+ return ERROR;
+}
+
+int get_xen_basic_info_arm64(void)
+{
+ return ERROR;
+}
+
+int get_xen_info_arm64(void)
+{
+ return ERROR;
+}
+
+int get_versiondep_info_arm64(void)
+{
+ return TRUE;
+}
+
+/*
+ * vtop_arm64() - translate arbitrary virtual address to physical
+ * @vaddr: virtual address to translate
+ *
+ * Function translates @vaddr into physical address using page tables. This
+ * address can be any virtual address. Returns physical address of the
+ * corresponding virtual address or %NOT_PADDR when there is no translation.
+ */
+static unsigned long long vtop_arm64(unsigned long vaddr)
+{
+ unsigned long long paddr = NOT_PADDR;
+ pgd_t *pgda, pgdv;
+ pud_t *puda;
+ pmd_t *pmda, pmdv;
+ pte_t *ptea, ptev;
+
+ 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(VADDR, (unsigned long long)pgda, &pgdv, sizeof(pgdv))) {
+ ERRMSG("Can't read pgd\n");
+ return NOT_PADDR;
+ }
+
+ puda = pud_offset(pgda, vaddr);
+ pmda = pmd_offset(puda, vaddr);
+ if (!readmem(VADDR, (unsigned long long)pmda, &pmdv, sizeof(pmdv))) {
+ ERRMSG("Can't read pmd\n");
+ return NOT_PADDR;
+ }
+
+ switch (pmd_val(pmdv) & PMD_TYPE_MASK) {
+ case PMD_TYPE_TABLE:
+ ptea = pte_offset(&pmdv, vaddr);
+ /* 64k page */
+ if (!readmem(VADDR, (unsigned long long)ptea, &ptev, sizeof(ptev))) {
+ ERRMSG("Can't read pte\n");
+ return NOT_PADDR;
+ }
+
+ if (!(pte_val(ptev) & PAGE_PRESENT)) {
+ ERRMSG("Can't get a valid pte.\n");
+ return NOT_PADDR;
+ } else {
+
+ paddr = (PAGEBASE(pte_val(ptev)) & PHYS_MASK)
+ + (vaddr & (PAGESIZE() - 1));
+ }
+ break;
+ case PMD_TYPE_SECT:
+ /* 1GB section */
+ paddr = (pmd_val(pmdv) & PMD_MASK) + (vaddr & (PMD_SIZE - 1));
+ break;
+ }
+
+ return paddr;
+}
+
+unsigned long long vaddr_to_paddr_arm64(unsigned long vaddr)
+{
+ /*
+ * use translation tables when a) user has explicitly requested us to
+ * perform translation for a given address. b) virtual address lies in
+ * vmalloc, vmemmap or modules memory region. Otherwise we assume that
+ * the translation is done within the kernel direct mapped region.
+ */
+ if ((info->vaddr_for_vtop == vaddr) ||
+ is_vtop_from_page_table_arm64(vaddr))
+ return vtop_arm64(vaddr);
+
+ return __pa(vaddr);
+}
+#endif
diff --git a/makedumpfile.h b/makedumpfile.h
index d2fadbd1f985..92a2bb629bcb 100644
--- a/makedumpfile.h
+++ b/makedumpfile.h
@@ -483,6 +483,33 @@ do { \
#define VMEMMAP_START (info->vmemmap_start)
#define VMEMMAP_END (info->vmemmap_end)
+#ifdef __aarch64__
+#define CONFIG_ARM64_PGTABLE_LEVELS 2
+#define CONFIG_ARM64_VA_BITS 42
+#define CONFIG_ARM64_64K_PAGES 1
+
+/* Currently we only suport following defines based on above
+ * config definitions.
+ * TODOs: We need to find a way to get above defines dynamically and
+ * then to support following definitions based on that
+ */
+
+#if CONFIG_ARM64_PGTABLE_LEVELS == 2
+#define ARM64_PGTABLE_LEVELS 2
+#endif
+
+#if CONFIG_ARM64_VA_BITS == 42
+#define VA_BITS 42
+#endif
+
+#ifdef CONFIG_ARM64_64K_PAGES
+#define PAGE_SHIFT 16
+#endif
+
+#define KVBASE_MASK (0xffffffffffffffffUL << (VA_BITS - 1))
+#define KVBASE (SYMBOL(_stext) & KVBASE_MASK)
+#endif /* aarch64 */
+
#ifdef __arm__
#define KVBASE_MASK (0xffff)
#define KVBASE (SYMBOL(_stext) & ~KVBASE_MASK)
@@ -761,6 +788,22 @@ do { \
*/
static inline int stub_true() { return TRUE; }
static inline int stub_true_ul(unsigned long x) { return TRUE; }
+#ifdef __aarch64__
+int get_phys_base_arm64(void);
+int get_machdep_info_arm64(void);
+unsigned long long vaddr_to_paddr_arm64(unsigned long vaddr);
+int get_versiondep_info_arm64(void);
+int get_xen_basic_info_arm64(void);
+int get_xen_info_arm64(void);
+#define vaddr_to_paddr(X) vaddr_to_paddr_arm64(X)
+#define get_phys_base() get_phys_base_arm64()
+#define get_machdep_info() get_machdep_info_arm64()
+#define get_versiondep_info() get_versiondep_info_arm64()
+#define get_xen_basic_info_arch(X) get_xen_basic_info_arm64(X)
+#define get_xen_info_arch(X) get_xen_info_arm64(X)
+#define is_phys_addr(X) stub_true_ul(X)
+#endif /* aarch64 */
+
#ifdef __arm__
int get_phys_base_arm(void);
int get_machdep_info_arm(void);
@@ -1608,6 +1651,11 @@ struct domain_list {
#define PAGES_PER_MAPWORD (sizeof(unsigned long) * 8)
#define MFNS_PER_FRAME (info->page_size / sizeof(unsigned long))
+#ifdef __aarch64__
+unsigned long long kvtop_xen_arm64(unsigned long kvaddr);
+#define kvtop_xen(X) kvtop_xen_arm64(X)
+#endif /* aarch64 */
+
#ifdef __arm__
#define kvtop_xen(X) FALSE
#define get_xen_basic_info_arch(X) FALSE
--
2.1.0
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