[Crash-utility] [PATCH] crash: ARM: support LPAE
Liu Hua
sdu.liu at huawei.com
Wed Jun 4 02:42:55 UTC 2014
Hi Dave,
This patch introduces LPAE support for ARM32 platform.
main description:
(1) identify LPAE enabled vmcores:
PG_DIR_SIZE(LPAE:20K,other:16K)
(2) section mapping size changed to 2MiB
(3) virtual to physical address converting:
(a)
#define PTRS_PER_PTE 512
#define PTRS_PER_PMD 512
#define PTRS_PER_PGD 4
(b) Each ptr are 8-bit long, so we need sevel new
macros to deal with them: FILL_PGD_LPAE ...
(c) arm_translate_pte changed as x86_translate_pte
(d) arm_lpae_vtop doing this converting
Signed-off-by: Wei Jitao <weijitao at huawei.com>
Signed-off-by: Liu Hua <sdu.liu at huawei.com>
---
arm.c | 134 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------
defs.h | 77 +++++++++++++++++++++++++++++++++++++
2 files changed, 200 insertions(+), 11 deletions(-)
diff --git a/arm.c b/arm.c
index 84dd3ec..001fe6b 100644
--- a/arm.c
+++ b/arm.c
@@ -83,6 +83,7 @@ static struct arm_pt_regs *panic_task_regs;
#define PMD_TYPE_MASK 3
#define PMD_TYPE_SECT 2
#define PMD_TYPE_TABLE 1
+#define PMD_TYPE_SECT_LPAE 1
static inline ulong *
pmd_page_addr(ulong pmd)
@@ -219,12 +220,19 @@ arm_init(int when)
case PRE_GDB:
if ((machdep->pgd = (char *)malloc(PGDIR_SIZE())) == NULL)
error(FATAL, "cannot malloc pgd space.");
+ if ((machdep->pmd = (char *)malloc(PMDSIZE())) == NULL)
+ error(FATAL, "cannot malloc pmd space.");
if ((machdep->ptbl = (char *)malloc(PAGESIZE())) == NULL)
error(FATAL, "cannot malloc ptbl space.");
/*
- * Kernel text starts 16k after PAGE_OFFSET.
+ *LPAE requires an additional page for the PGD;
+ *So PG_DIR_SIZE = 0x5000 for LPAE
*/
+
+ if (symbol_value("_text") - symbol_value("swapper_pg_dir")
+ == 0x5000)
+ machdep->flags |= PAE;
machdep->kvbase = symbol_value("_stext") & ~KVBASE_MASK;
machdep->identity_map_base = machdep->kvbase;
machdep->is_kvaddr = arm_is_kvaddr;
@@ -269,9 +277,13 @@ arm_init(int when)
if (THIS_KERNEL_VERSION >= LINUX(3,3,0) ||
symbol_exists("idmap_pgd"))
machdep->flags |= IDMAP_PGD;
-
- machdep->section_size_bits = _SECTION_SIZE_BITS;
- machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
+ if (machdep->flags & PAE) {
+ machdep->section_size_bits = _SECTION_SIZE_BITS_LPAE;
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS_LPAE;
+ } else {
+ machdep->section_size_bits = _SECTION_SIZE_BITS;
+ machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
+ }
if (symbol_exists("irq_desc"))
ARRAY_LENGTH_INIT(machdep->nr_irqs, irq_desc,
@@ -834,24 +846,32 @@ arm_processor_speed(void)
* is passed in, don't print anything.
*/
static int
-arm_translate_pte(ulong pte, void *physaddr, ulonglong pae_pte)
+arm_translate_pte(ulong pte, void *physaddr, ulonglong lpae_pte)
{
char ptebuf[BUFSIZE];
char physbuf[BUFSIZE];
char buf[BUFSIZE];
int page_present;
- ulong paddr;
+ ulonglong paddr;
int len1, len2, others;
+ if (machdep->flags & PAE) {
+ paddr = LPAE_PAGEBASE(lpae_pte);
+ sprintf(ptebuf, "%llx", lpae_pte);
+ pte = (ulong)lpae_pte;
+ } else {
+ paddr = PAGEBASE(pte);
+ sprintf(ptebuf, "%lx", pte);
+ }
page_present = pte_present(pte);
- paddr = PAGEBASE(pte);
-
if (physaddr) {
- *((ulong *)physaddr) = paddr;
+ if (machdep->flags & PAE)
+ *((ulonglong *)physaddr) = paddr;
+ else
+ *((ulong *)physaddr) = (ulong)paddr;
return page_present;
}
- sprintf(ptebuf, "%lx", pte);
len1 = MAX(strlen(ptebuf), strlen("PTE"));
fprintf(fp, "%s ", mkstring(buf, len1, CENTER | LJUST, "PTE"));
@@ -860,7 +880,7 @@ arm_translate_pte(ulong pte, void *physaddr, ulonglong pae_pte)
return page_present;
}
- sprintf(physbuf, "%lx", paddr);
+ sprintf(physbuf, "%llx", paddr);
len2 = MAX(strlen(physbuf), strlen("PHYSICAL"));
fprintf(fp, "%s ", mkstring(buf, len2, CENTER | LJUST, "PHYSICAL"));
@@ -1049,6 +1069,91 @@ arm_vtop(ulong vaddr, ulong *pgd, physaddr_t *paddr, int verbose)
}
/*
+ *Virtual to physical memory translation when "CONFIG_ARM_LPAE=y".
+ *This function will be called by both arm_kvtop() and arm_uvtop().
+ */
+static int
+arm_lpae_vtop(ulong vaddr, ulong *pgd, physaddr_t *paddr, int verbose)
+{
+ char buf[BUFSIZE];
+ physaddr_t page_dir;
+ physaddr_t page_middle;
+ physaddr_t page_table;
+ pgd_t pgd_pmd;
+ pmd_t pmd_pte;
+ pte_t pte;
+
+ if (verbose)
+ fprintf(fp, "PAGE DIRECTORY: %lx\n", (ulong)pgd);
+
+ /*
+ * pgd_offset(pgd, vaddr)
+ */
+ page_dir = LPAE_VTOP((ulong)pgd + LPAE_PGD_OFFSET(vaddr) * 8);
+ FILL_PGD_LPAE(LPAE_VTOP(pgd), PHYSADDR, LPAE_PGDIR_SIZE());
+ pgd_pmd = ULONGLONG(machdep->pgd + LPAE_PGDIR_OFFSET(page_dir));
+
+ if (verbose)
+ fprintf(fp, " PGD: %8llx => %llx\n",
+ (ulonglong)page_dir, pgd_pmd);
+
+ if (!pgd_pmd)
+ return FALSE;
+
+ /*
+ * pmd_offset(pgd, vaddr)
+ */
+ page_middle = LPAE_PAGEBASE(pgd_pmd) + LPAE_PMD_OFFSET(vaddr) * 8;
+ FILL_PMD_LPAE(LPAE_PAGEBASE(pgd_pmd), PHYSADDR, LPAE_PMDIR_SIZE());
+ pmd_pte = ULONGLONG(machdep->pmd + LPAE_PMDIR_OFFSET(page_middle));
+
+ if (!pmd_pte)
+ return FALSE;
+
+ if ((pmd_pte & PMD_TYPE_MASK) == PMD_TYPE_SECT_LPAE) {
+ ulonglong sectionbase = LPAE_PAGEBASE(pmd_pte)
+ & LPAE_SECTION_PAGE_MASK;
+
+ if (verbose) {
+ fprintf(fp, " PAGE: %8llx (2MB)\n\n",
+ (ulonglong)sectionbase);
+ }
+
+ *paddr = sectionbase + (vaddr & ~LPAE_SECTION_PAGE_MASK);
+ return TRUE;
+ }
+ /*
+ * pte_offset_map(pmd, vaddr)
+ */
+ page_table = LPAE_PAGEBASE(pmd_pte) + PTE_OFFSET(vaddr) * 8;
+ FILL_PTBL_LPAE(LPAE_PAGEBASE(pmd_pte), PHYSADDR, LPAE_PTEDIR_SIZE());
+ pte = ULONGLONG(machdep->ptbl + LPAE_PTEDIR_OFFSET(page_table));
+
+ if (verbose) {
+ fprintf(fp, " PTE: %8llx => %llx\n\n",
+ (ulonglong)page_table, pte);
+ }
+
+ if (!pte_present(pte)) {
+ if (pte && verbose) {
+ fprintf(fp, "\n");
+ arm_translate_pte(0, 0, pte);
+ }
+ return FALSE;
+ }
+
+ *paddr = LPAE_PAGEBASE(pte) + PAGEOFFSET(vaddr);
+
+ if (verbose) {
+ fprintf(fp, " PAGE: %s\n\n",
+ mkstring(buf, VADDR_PRLEN, RJUST | LONG_HEX,
+ MKSTR(PAGEBASE(pte))));
+ arm_translate_pte(0, 0, pte);
+ }
+ return TRUE;
+}
+
+/*
* Translates a user virtual address to its physical address. cmd_vtop() sets
* the verbose flag so that the pte translation gets displayed; all other
* callers quietly accept the translation.
@@ -1098,6 +1203,9 @@ arm_uvtop(struct task_context *tc, ulong uvaddr, physaddr_t *paddr, int verbose)
FAULT_ON_ERROR);
}
+ if (machdep->flags & PAE)
+ return arm_lpae_vtop(uvaddr, pgd, paddr, verbose);
+
return arm_vtop(uvaddr, pgd, paddr, verbose);
}
@@ -1123,6 +1231,10 @@ arm_kvtop(struct task_context *tc, ulong kvaddr, physaddr_t *paddr, int verbose)
return TRUE;
}
+ if (machdep->flags & PAE)
+ return arm_lpae_vtop(kvaddr,
+ (ulong *)vt->kernel_pgd[0], paddr, verbose);
+
return arm_vtop(kvaddr, (ulong *)vt->kernel_pgd[0], paddr, verbose);
}
diff --git a/defs.h b/defs.h
index 0ae4e48..44df6ae 100644
--- a/defs.h
+++ b/defs.h
@@ -2647,6 +2647,80 @@ struct load_module {
#define _SECTION_SIZE_BITS 28
#define _MAX_PHYSMEM_BITS 32
+/*add for LPAE*/
+typedef unsigned long long u64;
+typedef signed int s32;
+typedef u64 pgd_t;
+typedef u64 pmd_t;
+typedef u64 pte_t;
+
+#define PMDSIZE() (PAGESIZE())
+#define LPAE_PGDIR_SHIFT (30)
+#define LPAE_PMDIR_SHIFT (21)
+
+#define LPAE_PGD_OFFSET(vaddr) ((vaddr) >> LPAE_PGDIR_SHIFT)
+#define LPAE_PMD_OFFSET(vaddr) (((vaddr) >> LPAE_PMDIR_SHIFT) & \
+ ((1<<(LPAE_PGDIR_SHIFT-LPAE_PMDIR_SHIFT))-1))
+
+#define _SECTION_SIZE_BITS_LPAE 28
+#define _MAX_PHYSMEM_BITS_LPAE 36
+
+/*
+ * #define PTRS_PER_PTE 512
+ * #define PTRS_PER_PMD 512
+ * #define PTRS_PER_PGD 4
+ *
+ */
+
+#define LPAE_PGDIR_SIZE() 32
+#define LPAE_PGDIR_OFFSET(X) (((ulong)(X)) & (LPAE_PGDIR_SIZE() - 1))
+
+#define LPAE_PMDIR_SIZE() 4096
+#define LPAE_PMDIR_OFFSET(X) (((ulong)(X)) & (LPAE_PMDIR_SIZE() - 1))
+
+#define LPAE_PTEDIR_SIZE() 4096
+#define LPAE_PTEDIR_OFFSET(X) (((ulong)(X)) & (LPAE_PTEDIR_SIZE() - 1))
+
+/*section size for LPAE is 2MiB*/
+#define LPAE_SECTION_PAGE_MASK (~((MEGABYTES(2))-1))
+
+#define _PHYSICAL_MASK_LPAE ((1ULL << _MAX_PHYSMEM_BITS_LPAE) - 1)
+#define PAGE_BASE_MASK ((u64)((s32)machdep->pagemask & _PHYSICAL_MASK_LPAE))
+#define LPAE_PAGEBASE(X) (((ulonglong)(X)) & PAGE_BASE_MASK)
+
+#define LPAE_VTOP(X) \
+ ((unsigned long long)(unsigned long)(X) - \
+ (machdep->kvbase) + (machdep->machspec->phys_base))
+
+#define IS_LAST_PGD_READ_LPAE(pgd) ((pgd) == \
+ machdep->machspec->last_pgd_read_lpae)
+#define IS_LAST_PMD_READ_LPAE(pmd) ((pmd) == \
+ machdep->machspec->last_pmd_read_lpae)
+#define IS_LAST_PTBL_READ_LPAE(ptbl) ((ptbl) == \
+ machdep->machspec->last_ptbl_read_lpae)
+
+#define FILL_PGD_LPAE(PGD, TYPE, SIZE) \
+ if (!IS_LAST_PGD_READ_LPAE(PGD)) { \
+ readmem((ulonglong)(PGD), TYPE, machdep->pgd, \
+ SIZE, "pmd page", FAULT_ON_ERROR); \
+ machdep->machspec->last_pgd_read_lpae \
+ = (ulonglong)(PGD); \
+ }
+#define FILL_PMD_LPAE(PMD, TYPE, SIZE) \
+ if (!IS_LAST_PMD_READ_LPAE(PMD)) { \
+ readmem((ulonglong)(PMD), TYPE, machdep->pmd, \
+ SIZE, "pmd page", FAULT_ON_ERROR); \
+ machdep->machspec->last_pmd_read_lpae \
+ = (ulonglong)(PMD); \
+ }
+
+#define FILL_PTBL_LPAE(PTBL, TYPE, SIZE) \
+ if (!IS_LAST_PTBL_READ_LPAE(PTBL)) { \
+ readmem((ulonglong)(PTBL), TYPE, machdep->ptbl, \
+ SIZE, "page table", FAULT_ON_ERROR); \
+ machdep->machspec->last_ptbl_read_lpae \
+ = (ulonglong)(PTBL); \
+ }
#endif /* ARM */
#ifndef EM_AARCH64
@@ -4979,6 +5053,9 @@ struct machine_specific {
ulong kernel_text_end;
ulong exception_text_start;
ulong exception_text_end;
+ ulonglong last_pgd_read_lpae;
+ ulonglong last_pmd_read_lpae;
+ ulonglong last_ptbl_read_lpae;
struct arm_pt_regs *crash_task_regs;
int unwind_index_prel31;
};
--
1.9.0
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