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Commit 7c91efce authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman
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powerpc/mm: dump block address translation on book3s/32 



This patch adds a debugfs file to dump block address translation:

~# cat /sys/kernel/debug/powerpc/block_address_translation
---[ Instruction Block Address Translations ]---
0:         -
1:         -
2: 0xc0000000-0xcfffffff 0x00000000 Kernel EXEC coherent
3: 0xd0000000-0xdfffffff 0x10000000 Kernel EXEC coherent
4:         -
5:         -
6:         -
7:         -

---[ Data Block Address Translations ]---
0:         -
1:         -
2: 0xc0000000-0xcfffffff 0x00000000 Kernel RW coherent
3: 0xd0000000-0xdfffffff 0x10000000 Kernel RW coherent
4:         -
5:         -
6:         -
7:         -

Signed-off-by: default avatarChristophe Leroy <christophe.leroy@c-s.fr>

Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 0261a508

arch/powerpc/include/asm/book3s/32/mmu-hash.h

+4 −0
Original line number Diff line number Diff line
@@ -37,8 +37,12 @@ 
#define BAT_PHYS_ADDR(x) ((u32)((x & 0x00000000fffe0000ULL) | \

				((x & 0x0000000e00000000ULL) >> 24) | \

				((x & 0x0000000100000000ULL) >> 30)))

#define PHYS_BAT_ADDR(x) (((u64)(x) & 0x00000000fffe0000ULL) | \

			  (((u64)(x) << 24) & 0x0000000e00000000ULL) | \

			  (((u64)(x) << 30) & 0x0000000100000000ULL))

#else

#define BAT_PHYS_ADDR(x) (x)

#define PHYS_BAT_ADDR(x) ((x) & 0xfffe0000)

#endif



struct ppc_bat {

arch/powerpc/mm/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -50,7 +50,7 @@ ifdef CONFIG_PPC_PTDUMP 
obj-$(CONFIG_4xx)		+= dump_linuxpagetables-generic.o

obj-$(CONFIG_PPC_8xx)		+= dump_linuxpagetables-8xx.o

obj-$(CONFIG_PPC_BOOK3E_MMU)	+= dump_linuxpagetables-generic.o

obj-$(CONFIG_PPC_BOOK3S_32)	+= dump_linuxpagetables-generic.o dump_sr.o

obj-$(CONFIG_PPC_BOOK3S_32)	+= dump_linuxpagetables-generic.o dump_bats.o dump_sr.o

obj-$(CONFIG_PPC_BOOK3S_64)	+= dump_linuxpagetables-book3s64.o

endif

obj-$(CONFIG_PPC_HTDUMP)	+= dump_hashpagetable.o

arch/powerpc/mm/dump_bats.c

0 → 100644
+173 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0+

/*

 * Copyright 2018, Christophe Leroy CS S.I.

 * <christophe.leroy@c-s.fr>

 *

 * This dumps the content of BATS

 */



#include <asm/debugfs.h>

#include <asm/pgtable.h>

#include <asm/cpu_has_feature.h>



static char *pp_601(int k, int pp)

{

	if (pp == 0)

		return k ? "NA" : "RWX";

	if (pp == 1)

		return k ? "ROX" : "RWX";

	if (pp == 2)

		return k ? "RWX" : "RWX";

	return k ? "ROX" : "ROX";

}



static void bat_show_601(struct seq_file *m, int idx, u32 lower, u32 upper)

{

	u32 blpi = upper & 0xfffe0000;

	u32 k = (upper >> 2) & 3;

	u32 pp = upper & 3;

	phys_addr_t pbn = PHYS_BAT_ADDR(lower);

	u32 bsm = lower & 0x3ff;

	u32 size = (bsm + 1) << 17;



	seq_printf(m, "%d: ", idx);

	if (!(lower & 0x40)) {

		seq_puts(m, "        -\n");

		return;

	}



	seq_printf(m, "0x%08x-0x%08x ", blpi, blpi + size - 1);

#ifdef CONFIG_PHYS_64BIT

	seq_printf(m, "0x%016llx ", pbn);

#else

	seq_printf(m, "0x%08x ", pbn);

#endif



	seq_printf(m, "Kernel %s User %s", pp_601(k & 2, pp), pp_601(k & 1, pp));



	if (lower & _PAGE_WRITETHRU)

		seq_puts(m, "write through ");

	if (lower & _PAGE_NO_CACHE)

		seq_puts(m, "no cache ");

	if (lower & _PAGE_COHERENT)

		seq_puts(m, "coherent ");

	seq_puts(m, "\n");

}



#define BAT_SHOW_601(_m, _n, _l, _u) bat_show_601(_m, _n, mfspr(_l), mfspr(_u))



static int bats_show_601(struct seq_file *m, void *v)

{

	seq_puts(m, "---[ Block Address Translation ]---\n");



	BAT_SHOW_601(m, 0, SPRN_IBAT0L, SPRN_IBAT0U);

	BAT_SHOW_601(m, 1, SPRN_IBAT1L, SPRN_IBAT1U);

	BAT_SHOW_601(m, 2, SPRN_IBAT2L, SPRN_IBAT2U);

	BAT_SHOW_601(m, 3, SPRN_IBAT3L, SPRN_IBAT3U);



	return 0;

}



static void bat_show_603(struct seq_file *m, int idx, u32 lower, u32 upper, bool is_d)

{

	u32 bepi = upper & 0xfffe0000;

	u32 bl = (upper >> 2) & 0x7ff;

	u32 k = upper & 3;

	phys_addr_t brpn = PHYS_BAT_ADDR(lower);

	u32 size = (bl + 1) << 17;



	seq_printf(m, "%d: ", idx);

	if (k == 0) {

		seq_puts(m, "        -\n");

		return;

	}



	seq_printf(m, "0x%08x-0x%08x ", bepi, bepi + size - 1);

#ifdef CONFIG_PHYS_64BIT

	seq_printf(m, "0x%016llx ", brpn);

#else

	seq_printf(m, "0x%08x ", brpn);

#endif



	if (k == 1)

		seq_puts(m, "User ");

	else if (k == 2)

		seq_puts(m, "Kernel ");

	else

		seq_puts(m, "Kernel/User ");



	if (lower & BPP_RX)

		seq_puts(m, is_d ? "RO " : "EXEC ");

	else if (lower & BPP_RW)

		seq_puts(m, is_d ? "RW " : "EXEC ");

	else

		seq_puts(m, is_d ? "NA " : "NX   ");



	if (lower & _PAGE_WRITETHRU)

		seq_puts(m, "write through ");

	if (lower & _PAGE_NO_CACHE)

		seq_puts(m, "no cache ");

	if (lower & _PAGE_COHERENT)

		seq_puts(m, "coherent ");

	if (lower & _PAGE_GUARDED)

		seq_puts(m, "guarded ");

	seq_puts(m, "\n");

}



#define BAT_SHOW_603(_m, _n, _l, _u, _d) bat_show_603(_m, _n, mfspr(_l), mfspr(_u), _d)



static int bats_show_603(struct seq_file *m, void *v)

{

	seq_puts(m, "---[ Instruction Block Address Translation ]---\n");



	BAT_SHOW_603(m, 0, SPRN_IBAT0L, SPRN_IBAT0U, false);

	BAT_SHOW_603(m, 1, SPRN_IBAT1L, SPRN_IBAT1U, false);

	BAT_SHOW_603(m, 2, SPRN_IBAT2L, SPRN_IBAT2U, false);

	BAT_SHOW_603(m, 3, SPRN_IBAT3L, SPRN_IBAT3U, false);

	if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) {

		BAT_SHOW_603(m, 4, SPRN_IBAT4L, SPRN_IBAT4U, false);

		BAT_SHOW_603(m, 5, SPRN_IBAT5L, SPRN_IBAT5U, false);

		BAT_SHOW_603(m, 6, SPRN_IBAT6L, SPRN_IBAT6U, false);

		BAT_SHOW_603(m, 7, SPRN_IBAT7L, SPRN_IBAT7U, false);

	}



	seq_puts(m, "\n---[ Data Block Address Translation ]---\n");



	BAT_SHOW_603(m, 0, SPRN_DBAT0L, SPRN_DBAT0U, true);

	BAT_SHOW_603(m, 1, SPRN_DBAT1L, SPRN_DBAT1U, true);

	BAT_SHOW_603(m, 2, SPRN_DBAT2L, SPRN_DBAT2U, true);

	BAT_SHOW_603(m, 3, SPRN_DBAT3L, SPRN_DBAT3U, true);

	if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) {

		BAT_SHOW_603(m, 4, SPRN_DBAT4L, SPRN_DBAT4U, true);

		BAT_SHOW_603(m, 5, SPRN_DBAT5L, SPRN_DBAT5U, true);

		BAT_SHOW_603(m, 6, SPRN_DBAT6L, SPRN_DBAT6U, true);

		BAT_SHOW_603(m, 7, SPRN_DBAT7L, SPRN_DBAT7U, true);

	}



	return 0;

}



static int bats_open(struct inode *inode, struct file *file)

{

	if (cpu_has_feature(CPU_FTR_601))

		return single_open(file, bats_show_601, NULL);



	return single_open(file, bats_show_603, NULL);

}



static const struct file_operations bats_fops = {

	.open		= bats_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release	= single_release,

};



static int __init bats_init(void)

{

	struct dentry *debugfs_file;



	debugfs_file = debugfs_create_file("block_address_translation", 0400,

					   powerpc_debugfs_root, NULL, &bats_fops);

	return debugfs_file ? 0 : -ENOMEM;

}

device_initcall(bats_init);