Merging upstream version 4.19.304.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 550 deletions

diff --git a/arch/powerpc/mm/dump_hashpagetable.c b/arch/powerpc/mm/dump_hashpagetable.c
deleted file mode 100644
index b430e4e08..000000000
--- a/arch/powerpc/mm/dump_hashpagetable.c
+++ /dev/null
@@ -1,550 +0,0 @@
-/*
- * Copyright 2016, Rashmica Gupta, IBM Corp.
- *
- * This traverses the kernel virtual memory and dumps the pages that are in
- * the hash pagetable, along with their flags to
- * /sys/kernel/debug/kernel_hash_pagetable.
- *
- * If radix is enabled then there is no hash page table and so no debugfs file
- * is generated.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; version 2
- * of the License.
- */
-#include <linux/debugfs.h>
-#include <linux/fs.h>
-#include <linux/io.h>
-#include <linux/mm.h>
-#include <linux/sched.h>
-#include <linux/seq_file.h>
-#include <asm/pgtable.h>
-#include <linux/const.h>
-#include <asm/page.h>
-#include <asm/pgalloc.h>
-#include <asm/plpar_wrappers.h>
-#include <linux/memblock.h>
-#include <asm/firmware.h>
-
-struct pg_state {
-	struct seq_file *seq;
-	const struct addr_marker *marker;
-	unsigned long start_address;
-	unsigned int level;
-	u64 current_flags;
-};
-
-struct addr_marker {
-	unsigned long start_address;
-	const char *name;
-};
-
-static struct addr_marker address_markers[] = {
-	{ 0,	"Start of kernel VM" },
-	{ 0,	"vmalloc() Area" },
-	{ 0,	"vmalloc() End" },
-	{ 0,	"isa I/O start" },
-	{ 0,	"isa I/O end" },
-	{ 0,	"phb I/O start" },
-	{ 0,	"phb I/O end" },
-	{ 0,	"I/O remap start" },
-	{ 0,	"I/O remap end" },
-	{ 0,	"vmemmap start" },
-	{ -1,	NULL },
-};
-
-struct flag_info {
-	u64		mask;
-	u64		val;
-	const char	*set;
-	const char	*clear;
-	bool		is_val;
-	int		shift;
-};
-
-static const struct flag_info v_flag_array[] = {
-	{
-		.mask   = SLB_VSID_B,
-		.val    = SLB_VSID_B_256M,
-		.set    = "ssize: 256M",
-		.clear  = "ssize: 1T  ",
-	}, {
-		.mask	= HPTE_V_SECONDARY,
-		.val	= HPTE_V_SECONDARY,
-		.set	= "secondary",
-		.clear	= "primary  ",
-	}, {
-		.mask	= HPTE_V_VALID,
-		.val	= HPTE_V_VALID,
-		.set	= "valid  ",
-		.clear	= "invalid",
-	}, {
-		.mask	= HPTE_V_BOLTED,
-		.val	= HPTE_V_BOLTED,
-		.set	= "bolted",
-		.clear	= "",
-	}
-};
-
-static const struct flag_info r_flag_array[] = {
-	{
-		.mask	= HPTE_R_PP0 | HPTE_R_PP,
-		.val	= PP_RWXX,
-		.set	= "prot:RW--",
-	}, {
-		.mask	= HPTE_R_PP0 | HPTE_R_PP,
-		.val	= PP_RWRX,
-		.set	= "prot:RWR-",
-	}, {
-		.mask	= HPTE_R_PP0 | HPTE_R_PP,
-		.val	= PP_RWRW,
-		.set	= "prot:RWRW",
-	}, {
-		.mask	= HPTE_R_PP0 | HPTE_R_PP,
-		.val	= PP_RXRX,
-		.set	= "prot:R-R-",
-	}, {
-		.mask	= HPTE_R_PP0 | HPTE_R_PP,
-		.val	= PP_RXXX,
-		.set	= "prot:R---",
-	}, {
-		.mask	= HPTE_R_KEY_HI | HPTE_R_KEY_LO,
-		.val	= HPTE_R_KEY_HI | HPTE_R_KEY_LO,
-		.set	= "key",
-		.clear	= "",
-		.is_val = true,
-	}, {
-		.mask	= HPTE_R_R,
-		.val	= HPTE_R_R,
-		.set	= "ref",
-		.clear	= "   ",
-	}, {
-		.mask	= HPTE_R_C,
-		.val	= HPTE_R_C,
-		.set	= "changed",
-		.clear	= "       ",
-	}, {
-		.mask	= HPTE_R_N,
-		.val	= HPTE_R_N,
-		.set	= "no execute",
-	}, {
-		.mask	= HPTE_R_WIMG,
-		.val	= HPTE_R_W,
-		.set	= "writethru",
-	}, {
-		.mask	= HPTE_R_WIMG,
-		.val	= HPTE_R_I,
-		.set	= "no cache",
-	}, {
-		.mask	= HPTE_R_WIMG,
-		.val	= HPTE_R_G,
-		.set	= "guarded",
-	}
-};
-
-static int calculate_pagesize(struct pg_state *st, int ps, char s[])
-{
-	static const char units[] = "BKMGTPE";
-	const char *unit = units;
-
-	while (ps > 9 && unit[1]) {
-		ps -= 10;
-		unit++;
-	}
-	seq_printf(st->seq, "  %s_ps: %i%c\t", s, 1<<ps, *unit);
-	return ps;
-}
-
-static void dump_flag_info(struct pg_state *st, const struct flag_info
-		*flag, u64 pte, int num)
-{
-	unsigned int i;
-
-	for (i = 0; i < num; i++, flag++) {
-		const char *s = NULL;
-		u64 val;
-
-		/* flag not defined so don't check it */
-		if (flag->mask == 0)
-			continue;
-		/* Some 'flags' are actually values */
-		if (flag->is_val) {
-			val = pte & flag->val;
-			if (flag->shift)
-				val = val >> flag->shift;
-			seq_printf(st->seq, "  %s:%llx", flag->set, val);
-		} else {
-			if ((pte & flag->mask) == flag->val)
-				s = flag->set;
-			else
-				s = flag->clear;
-			if (s)
-				seq_printf(st->seq, "  %s", s);
-		}
-	}
-}
-
-static void dump_hpte_info(struct pg_state *st, unsigned long ea, u64 v, u64 r,
-		unsigned long rpn, int bps, int aps, unsigned long lp)
-{
-	int aps_index;
-
-	while (ea >= st->marker[1].start_address) {
-		st->marker++;
-		seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
-	}
-	seq_printf(st->seq, "0x%lx:\t", ea);
-	seq_printf(st->seq, "AVPN:%llx\t", HPTE_V_AVPN_VAL(v));
-	dump_flag_info(st, v_flag_array, v, ARRAY_SIZE(v_flag_array));
-	seq_printf(st->seq, "  rpn: %lx\t", rpn);
-	dump_flag_info(st, r_flag_array, r, ARRAY_SIZE(r_flag_array));
-
-	calculate_pagesize(st, bps, "base");
-	aps_index = calculate_pagesize(st, aps, "actual");
-	if (aps_index != 2)
-		seq_printf(st->seq, "LP enc: %lx", lp);
-	seq_putc(st->seq, '\n');
-}
-
-
-static int native_find(unsigned long ea, int psize, bool primary, u64 *v, u64
-		*r)
-{
-	struct hash_pte *hptep;
-	unsigned long hash, vsid, vpn, hpte_group, want_v, hpte_v;
-	int i, ssize = mmu_kernel_ssize;
-	unsigned long shift = mmu_psize_defs[psize].shift;
-
-	/* calculate hash */
-	vsid = get_kernel_vsid(ea, ssize);
-	vpn  = hpt_vpn(ea, vsid, ssize);
-	hash = hpt_hash(vpn, shift, ssize);
-	want_v = hpte_encode_avpn(vpn, psize, ssize);
-
-	/* to check in the secondary hash table, we invert the hash */
-	if (!primary)
-		hash = ~hash;
-	hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP;
-	for (i = 0; i < HPTES_PER_GROUP; i++) {
-		hptep = htab_address + hpte_group;
-		hpte_v = be64_to_cpu(hptep->v);
-
-		if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID)) {
-			/* HPTE matches */
-			*v = be64_to_cpu(hptep->v);
-			*r = be64_to_cpu(hptep->r);
-			return 0;
-		}
-		++hpte_group;
-	}
-	return -1;
-}
-
-#ifdef CONFIG_PPC_PSERIES
-static int pseries_find(unsigned long ea, int psize, bool primary, u64 *v, u64 *r)
-{
-	struct hash_pte ptes[4];
-	unsigned long vsid, vpn, hash, hpte_group, want_v;
-	int i, j, ssize = mmu_kernel_ssize;
-	long lpar_rc = 0;
-	unsigned long shift = mmu_psize_defs[psize].shift;
-
-	/* calculate hash */
-	vsid = get_kernel_vsid(ea, ssize);
-	vpn  = hpt_vpn(ea, vsid, ssize);
-	hash = hpt_hash(vpn, shift, ssize);
-	want_v = hpte_encode_avpn(vpn, psize, ssize);
-
-	/* to check in the secondary hash table, we invert the hash */
-	if (!primary)
-		hash = ~hash;
-	hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP;
-	/* see if we can find an entry in the hpte with this hash */
-	for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) {
-		lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes);
-
-		if (lpar_rc != H_SUCCESS)
-			continue;
-		for (j = 0; j < 4; j++) {
-			if (HPTE_V_COMPARE(ptes[j].v, want_v) &&
-					(ptes[j].v & HPTE_V_VALID)) {
-				/* HPTE matches */
-				*v = ptes[j].v;
-				*r = ptes[j].r;
-				return 0;
-			}
-		}
-	}
-	return -1;
-}
-#endif
-
-static void decode_r(int bps, unsigned long r, unsigned long *rpn, int *aps,
-		unsigned long *lp_bits)
-{
-	struct mmu_psize_def entry;
-	unsigned long arpn, mask, lp;
-	int penc = -2, idx = 0, shift;
-
-	/*.
-	 * The LP field has 8 bits. Depending on the actual page size, some of
-	 * these bits are concatenated with the APRN to get the RPN. The rest
-	 * of the bits in the LP field is the LP value and is an encoding for
-	 * the base page size and the actual page size.
-	 *
-	 *  -	find the mmu entry for our base page size
-	 *  -	go through all page encodings and use the associated mask to
-	 *	find an encoding that matches our encoding in the LP field.
-	 */
-	arpn = (r & HPTE_R_RPN) >> HPTE_R_RPN_SHIFT;
-	lp = arpn & 0xff;
-
-	entry = mmu_psize_defs[bps];
-	while (idx < MMU_PAGE_COUNT) {
-		penc = entry.penc[idx];
-		if ((penc != -1) && (mmu_psize_defs[idx].shift)) {
-			shift = mmu_psize_defs[idx].shift -  HPTE_R_RPN_SHIFT;
-			mask = (0x1 << (shift)) - 1;
-			if ((lp & mask) == penc) {
-				*aps = mmu_psize_to_shift(idx);
-				*lp_bits = lp & mask;
-				*rpn = arpn >> shift;
-				return;
-			}
-		}
-		idx++;
-	}
-}
-
-static int base_hpte_find(unsigned long ea, int psize, bool primary, u64 *v,
-			  u64 *r)
-{
-#ifdef CONFIG_PPC_PSERIES
-	if (firmware_has_feature(FW_FEATURE_LPAR))
-		return pseries_find(ea, psize, primary, v, r);
-#endif
-	return native_find(ea, psize, primary, v, r);
-}
-
-static unsigned long hpte_find(struct pg_state *st, unsigned long ea, int psize)
-{
-	unsigned long slot;
-	u64 v  = 0, r = 0;
-	unsigned long rpn, lp_bits;
-	int base_psize = 0, actual_psize = 0;
-
-	if (ea < PAGE_OFFSET)
-		return -1;
-
-	/* Look in primary table */
-	slot = base_hpte_find(ea, psize, true, &v, &r);
-
-	/* Look in secondary table */
-	if (slot == -1)
-		slot = base_hpte_find(ea, psize, false, &v, &r);
-
-	/* No entry found */
-	if (slot == -1)
-		return -1;
-
-	/*
-	 * We found an entry in the hash page table:
-	 *  - check that this has the same base page
-	 *  - find the actual page size
-	 *  - find the RPN
-	 */
-	base_psize = mmu_psize_to_shift(psize);
-
-	if ((v & HPTE_V_LARGE) == HPTE_V_LARGE) {
-		decode_r(psize, r, &rpn, &actual_psize, &lp_bits);
-	} else {
-		/* 4K actual page size */
-		actual_psize = 12;
-		rpn = (r & HPTE_R_RPN) >> HPTE_R_RPN_SHIFT;
-		/* In this case there are no LP bits */
-		lp_bits = -1;
-	}
-	/*
-	 * We didn't find a matching encoding, so the PTE we found isn't for
-	 * this address.
-	 */
-	if (actual_psize == -1)
-		return -1;
-
-	dump_hpte_info(st, ea, v, r, rpn, base_psize, actual_psize, lp_bits);
-	return 0;
-}
-
-static void walk_pte(struct pg_state *st, pmd_t *pmd, unsigned long start)
-{
-	pte_t *pte = pte_offset_kernel(pmd, 0);
-	unsigned long addr, pteval, psize;
-	int i, status;
-
-	for (i = 0; i < PTRS_PER_PTE; i++, pte++) {
-		addr = start + i * PAGE_SIZE;
-		pteval = pte_val(*pte);
-
-		if (addr < VMALLOC_END)
-			psize = mmu_vmalloc_psize;
-		else
-			psize = mmu_io_psize;
-#ifdef CONFIG_PPC_64K_PAGES
-		/* check for secret 4K mappings */
-		if (((pteval & H_PAGE_COMBO) == H_PAGE_COMBO) ||
-			((pteval & H_PAGE_4K_PFN) == H_PAGE_4K_PFN))
-			psize = mmu_io_psize;
-#endif
-		/* check for hashpte */
-		status = hpte_find(st, addr, psize);
-
-		if (((pteval & H_PAGE_HASHPTE) != H_PAGE_HASHPTE)
-				&& (status != -1)) {
-		/* found a hpte that is not in the linux page tables */
-			seq_printf(st->seq, "page probably bolted before linux"
-				" pagetables were set: addr:%lx, pteval:%lx\n",
-				addr, pteval);
-		}
-	}
-}
-
-static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start)
-{
-	pmd_t *pmd = pmd_offset(pud, 0);
-	unsigned long addr;
-	unsigned int i;
-
-	for (i = 0; i < PTRS_PER_PMD; i++, pmd++) {
-		addr = start + i * PMD_SIZE;
-		if (!pmd_none(*pmd))
-			/* pmd exists */
-			walk_pte(st, pmd, addr);
-	}
-}
-
-static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
-{
-	pud_t *pud = pud_offset(pgd, 0);
-	unsigned long addr;
-	unsigned int i;
-
-	for (i = 0; i < PTRS_PER_PUD; i++, pud++) {
-		addr = start + i * PUD_SIZE;
-		if (!pud_none(*pud))
-			/* pud exists */
-			walk_pmd(st, pud, addr);
-	}
-}
-
-static void walk_pagetables(struct pg_state *st)
-{
-	pgd_t *pgd = pgd_offset_k(0UL);
-	unsigned int i;
-	unsigned long addr;
-
-	/*
-	 * Traverse the linux pagetable structure and dump pages that are in
-	 * the hash pagetable.
-	 */
-	for (i = 0; i < PTRS_PER_PGD; i++, pgd++) {
-		addr = KERN_VIRT_START + i * PGDIR_SIZE;
-		if (!pgd_none(*pgd))
-			/* pgd exists */
-			walk_pud(st, pgd, addr);
-	}
-}
-
-
-static void walk_linearmapping(struct pg_state *st)
-{
-	unsigned long addr;
-
-	/*
-	 * Traverse the linear mapping section of virtual memory and dump pages
-	 * that are in the hash pagetable.
-	 */
-	unsigned long psize = 1 << mmu_psize_defs[mmu_linear_psize].shift;
-
-	for (addr = PAGE_OFFSET; addr < PAGE_OFFSET +
-			memblock_end_of_DRAM(); addr += psize)
-		hpte_find(st, addr, mmu_linear_psize);
-}
-
-static void walk_vmemmap(struct pg_state *st)
-{
-#ifdef CONFIG_SPARSEMEM_VMEMMAP
-	struct vmemmap_backing *ptr = vmemmap_list;
-
-	/*
-	 * Traverse the vmemmaped memory and dump pages that are in the hash
-	 * pagetable.
-	 */
-	while (ptr->list) {
-		hpte_find(st, ptr->virt_addr, mmu_vmemmap_psize);
-		ptr = ptr->list;
-	}
-	seq_puts(st->seq, "---[ vmemmap end ]---\n");
-#endif
-}
-
-static void populate_markers(void)
-{
-	address_markers[0].start_address = PAGE_OFFSET;
-	address_markers[1].start_address = VMALLOC_START;
-	address_markers[2].start_address = VMALLOC_END;
-	address_markers[3].start_address = ISA_IO_BASE;
-	address_markers[4].start_address = ISA_IO_END;
-	address_markers[5].start_address = PHB_IO_BASE;
-	address_markers[6].start_address = PHB_IO_END;
-	address_markers[7].start_address = IOREMAP_BASE;
-	address_markers[8].start_address = IOREMAP_END;
-#ifdef CONFIG_PPC_BOOK3S_64
-	address_markers[9].start_address =  H_VMEMMAP_BASE;
-#else
-	address_markers[9].start_address =  VMEMMAP_BASE;
-#endif
-}
-
-static int ptdump_show(struct seq_file *m, void *v)
-{
-	struct pg_state st = {
-		.seq = m,
-		.start_address = PAGE_OFFSET,
-		.marker = address_markers,
-	};
-	/*
-	 * Traverse the 0xc, 0xd and 0xf areas of the kernel virtual memory and
-	 * dump pages that are in the hash pagetable.
-	 */
-	walk_linearmapping(&st);
-	walk_pagetables(&st);
-	walk_vmemmap(&st);
-	return 0;
-}
-
-static int ptdump_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, ptdump_show, NULL);
-}
-
-static const struct file_operations ptdump_fops = {
-	.open		= ptdump_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
-
-static int ptdump_init(void)
-{
-	struct dentry *debugfs_file;
-
-	if (!radix_enabled()) {
-		populate_markers();
-		debugfs_file = debugfs_create_file("kernel_hash_pagetable",
-				0400, NULL, NULL, &ptdump_fops);
-		return debugfs_file ? 0 : -ENOMEM;
-	}
-	return 0;
-}
-device_initcall(ptdump_init);