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RISC-V: Add page table dump support for uefi 

Extend the current page table dump support in RISC-V to include efi
pages as well.

Here is the output of efi runtime page table mappings.

---[ UEFI runtime start ]---
0x0000000020002000-0x0000000020003000 0x00000000be732000 4K PTE D A . . . W R V
0x0000000020018000-0x0000000020019000 0x00000000be738000 4K PTE D A . . . W R V
0x000000002002c000-0x000000002002d000 0x00000000be73c000 4K PTE D A . . . W R V
0x0000000020031000-0x0000000020032000 0x00000000bff61000 4K PTE D A . . X W R V
---[ UEFI runtime end ]---

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Atish Patra 2020-09-17 15:37:16 -07:00 committed by Palmer Dabbelt
parent b91540d52a
commit de22d2107c
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
1 changed files with 42 additions and 6 deletions
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48
arch/riscv/mm/ptdump.c
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@ -3,6 +3,7 @@
* Copyright (C) 2019 SiFive * Copyright (C) 2019 SiFive
*/ */
#include <linux/efi.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/debugfs.h> #include <linux/debugfs.h>
#include <linux/seq_file.h> #include <linux/seq_file.h>
@ -49,6 +50,14 @@ struct addr_marker {
const char *name; const char *name;
}; };
/* Private information for debugfs */
struct ptd_mm_info {
struct mm_struct *mm;
const struct addr_marker *markers;
unsigned long base_addr;
unsigned long end;
};
static struct addr_marker address_markers[] = { static struct addr_marker address_markers[] = {
#ifdef CONFIG_KASAN #ifdef CONFIG_KASAN
{KASAN_SHADOW_START, "Kasan shadow start"}, {KASAN_SHADOW_START, "Kasan shadow start"},
@ -68,6 +77,28 @@ static struct addr_marker address_markers[] = {
{-1, NULL}, {-1, NULL},
}; };
static struct ptd_mm_info kernel_ptd_info = {
.mm = &init_mm,
.markers = address_markers,
.base_addr = KERN_VIRT_START,
.end = ULONG_MAX,
};
#ifdef CONFIG_EFI
static struct addr_marker efi_addr_markers[] = {
{ 0, "UEFI runtime start" },
{ SZ_1G, "UEFI runtime end" },
{ -1, NULL }
};
static struct ptd_mm_info efi_ptd_info = {
.mm = &efi_mm,
.markers = efi_addr_markers,
.base_addr = 0,
.end = SZ_2G,
};
#endif
/* Page Table Entry */ /* Page Table Entry */
struct prot_bits { struct prot_bits {
u64 mask; u64 mask;
@ -245,22 +276,22 @@ static void note_page(struct ptdump_state *pt_st, unsigned long addr,
} }
} }
static void ptdump_walk(struct seq_file *s) static void ptdump_walk(struct seq_file *s, struct ptd_mm_info *pinfo)
{ {
struct pg_state st = { struct pg_state st = {
.seq = s, .seq = s,
.marker = address_markers, .marker = pinfo->markers,
.level = -1, .level = -1,
.ptdump = { .ptdump = {
.note_page = note_page, .note_page = note_page,
.range = (struct ptdump_range[]) { .range = (struct ptdump_range[]) {
{KERN_VIRT_START, ULONG_MAX}, {pinfo->base_addr, pinfo->end},
{0, 0} {0, 0}
} }
} }
}; };
ptdump_walk_pgd(&st.ptdump, &init_mm, NULL); ptdump_walk_pgd(&st.ptdump, pinfo->mm, NULL);
} }
void ptdump_check_wx(void) void ptdump_check_wx(void)
@ -293,7 +324,7 @@ void ptdump_check_wx(void)
static int ptdump_show(struct seq_file *m, void *v) static int ptdump_show(struct seq_file *m, void *v)
{ {
ptdump_walk(m); ptdump_walk(m, m->private);
return 0; return 0;
} }
@ -308,8 +339,13 @@ static int ptdump_init(void)
for (j = 0; j < ARRAY_SIZE(pte_bits); j++) for (j = 0; j < ARRAY_SIZE(pte_bits); j++)
pg_level[i].mask |= pte_bits[j].mask; pg_level[i].mask |= pte_bits[j].mask;
debugfs_create_file("kernel_page_tables", 0400, NULL, NULL, debugfs_create_file("kernel_page_tables", 0400, NULL, &kernel_ptd_info,
&ptdump_fops); &ptdump_fops);
#ifdef CONFIG_EFI
if (efi_enabled(EFI_RUNTIME_SERVICES))
debugfs_create_file("efi_page_tables", 0400, NULL, &efi_ptd_info,
&ptdump_fops);
#endif
return 0; return 0;
} }