[Crash-utility] [PATCH] crash: ARM: support LPAE
Dave Anderson
anderson at redhat.com
Wed Jun 4 13:49:19 UTC 2014
----- Original Message -----
> Hi Dave,
>
> This patch introduces LPAE support for ARM32 platform.
Nicely done -- I appreciate your efforts!
I can only test that this doesn't affect non-PAE dumpfiles.
Would it be possible for you to create a sample vmcore and
make it available to me to download for future testing?
Thanks again,
Dave
>
> 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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