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powerpc/ptdump: Handle hugepd at PGD level 

The 8xx is about to map kernel linear space and IMMR using huge
pages.

In order to display those pages properly, ptdump needs to handle
hugepd tables at PGD level.

For the time being do it only at PGD level. Further patches may
add handling of hugepd tables at lower level for other platforms
when needed in the future.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/630728289158dcfeb06b14d40ed7c4c4e7148cf1.1589866984.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2020-05-19 05:48:55 +00:00 committed by Michael Ellerman
parent b00ff6d8c1
commit 6b789a26d7
1 changed files with 26 additions and 3 deletions
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29
arch/powerpc/mm/ptdump/ptdump.c
View File

@ -23,6 +23,7 @@
#include <linux/const.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/hugetlb.h>
#include <mm/mmu_decl.h>
@ -269,6 +270,26 @@ static void walk_pte(struct pg_state *st, pmd_t *pmd, unsigned long start)
}
}
static void walk_hugepd(struct pg_state *st, hugepd_t *phpd, unsigned long start,
int pdshift, int level)
{
#ifdef CONFIG_ARCH_HAS_HUGEPD
unsigned int i;
int shift = hugepd_shift(*phpd);
int ptrs_per_hpd = pdshift - shift > 0 ? 1 << (pdshift - shift) : 1;
if (start & ((1 << shift) - 1))
return;
for (i = 0; i < ptrs_per_hpd; i++) {
unsigned long addr = start + (i << shift);
pte_t *pte = hugepte_offset(*phpd, addr, pdshift);
note_page(st, addr, level + 1, pte_val(*pte), 1 << shift);
}
#endif
}
static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start)
{
pmd_t *pmd = pmd_offset(pud, 0);
@ -312,11 +333,13 @@ static void walk_pagetables(struct pg_state *st)
* the hash pagetable.
*/
for (i = pgd_index(addr); i < PTRS_PER_PGD; i++, pgd++, addr += PGDIR_SIZE) {
if (!pgd_none(*pgd) && !pgd_is_leaf(*pgd))
if (pgd_none(*pgd) || pgd_is_leaf(*pgd))
note_page(st, addr, 1, pgd_val(*pgd), PGDIR_SIZE);
else if (is_hugepd(__hugepd(pgd_val(*pgd))))
walk_hugepd(st, (hugepd_t *)pgd, addr, PGDIR_SHIFT, 1);
else
/* pgd exists */
walk_pud(st, pgd, addr);
else
note_page(st, addr, 1, pgd_val(*pgd), PGDIR_SIZE);
}
}