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>
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@ -3,6 +3,7 @@
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* Copyright (C) 2019 SiFive
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*/
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#include <linux/efi.h>
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#include <linux/init.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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@ -49,6 +50,14 @@ struct addr_marker {
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const char *name;
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};
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/* Private information for debugfs */
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struct ptd_mm_info {
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struct mm_struct *mm;
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const struct addr_marker *markers;
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unsigned long base_addr;
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unsigned long end;
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};
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static struct addr_marker address_markers[] = {
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#ifdef CONFIG_KASAN
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{KASAN_SHADOW_START, "Kasan shadow start"},
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@ -68,6 +77,28 @@ static struct addr_marker address_markers[] = {
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{-1, NULL},
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};
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static struct ptd_mm_info kernel_ptd_info = {
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.mm = &init_mm,
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.markers = address_markers,
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.base_addr = KERN_VIRT_START,
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.end = ULONG_MAX,
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};
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#ifdef CONFIG_EFI
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static struct addr_marker efi_addr_markers[] = {
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{ 0, "UEFI runtime start" },
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{ SZ_1G, "UEFI runtime end" },
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{ -1, NULL }
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};
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static struct ptd_mm_info efi_ptd_info = {
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.mm = &efi_mm,
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.markers = efi_addr_markers,
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.base_addr = 0,
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.end = SZ_2G,
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};
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#endif
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/* Page Table Entry */
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struct prot_bits {
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u64 mask;
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@ -245,22 +276,22 @@ static void note_page(struct ptdump_state *pt_st, unsigned long addr,
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}
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}
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static void ptdump_walk(struct seq_file *s)
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static void ptdump_walk(struct seq_file *s, struct ptd_mm_info *pinfo)
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{
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struct pg_state st = {
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.seq = s,
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.marker = address_markers,
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.marker = pinfo->markers,
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.level = -1,
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.ptdump = {
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.note_page = note_page,
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.range = (struct ptdump_range[]) {
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{KERN_VIRT_START, ULONG_MAX},
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{pinfo->base_addr, pinfo->end},
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{0, 0}
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}
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}
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};
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ptdump_walk_pgd(&st.ptdump, &init_mm, NULL);
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ptdump_walk_pgd(&st.ptdump, pinfo->mm, NULL);
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}
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void ptdump_check_wx(void)
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@ -293,7 +324,7 @@ void ptdump_check_wx(void)
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static int ptdump_show(struct seq_file *m, void *v)
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{
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ptdump_walk(m);
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ptdump_walk(m, m->private);
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return 0;
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}
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@ -308,8 +339,13 @@ static int ptdump_init(void)
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for (j = 0; j < ARRAY_SIZE(pte_bits); j++)
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pg_level[i].mask |= pte_bits[j].mask;
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debugfs_create_file("kernel_page_tables", 0400, NULL, NULL,
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debugfs_create_file("kernel_page_tables", 0400, NULL, &kernel_ptd_info,
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&ptdump_fops);
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#ifdef CONFIG_EFI
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if (efi_enabled(EFI_RUNTIME_SERVICES))
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debugfs_create_file("efi_page_tables", 0400, NULL, &efi_ptd_info,
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&ptdump_fops);
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#endif
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return 0;
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}
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