[PATCH] powerpc/mm: dump block address translation on book3s/32

[PATCH] powerpc/mm: dump block address translation on book3s/32

[Christophe Leroy]

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

~# cat /sys/kernel/debug/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: Christophe Leroy <christophe.leroy@c-s.fr>
---
 Tested on mpc8321 aka 603
 Please review/test the 601 part

 arch/powerpc/mm/Makefile    |   2 +-
 arch/powerpc/mm/dump_bats.c | 176 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 177 insertions(+), 1 deletion(-)
 create mode 100644 arch/powerpc/mm/dump_bats.c

diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
index ca96e7be4d0e..2adad10b5856 100644
--- a/arch/powerpc/mm/Makefile
+++ b/arch/powerpc/mm/Makefile
@@ -47,7 +47,7 @@ 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
+obj-$(CONFIG_PPC_BOOK3S_32)	+= dump_linuxpagetables-generic.o dump_bats.o
 obj-$(CONFIG_PPC_BOOK3S_64)	+= dump_linuxpagetables-book3s64.o
 endif
 obj-$(CONFIG_PPC_HTDUMP)	+= dump_hashpagetable.o
diff --git a/arch/powerpc/mm/dump_bats.c b/arch/powerpc/mm/dump_bats.c
new file mode 100644
index 000000000000..824a94ee9051
--- /dev/null
+++ b/arch/powerpc/mm/dump_bats.c
@@ -0,0 +1,176 @@
+// 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 <linux/debugfs.h>
+#include <linux/fs.h>
+#include <linux/hugetlb.h>
+#include <linux/io.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <asm/fixmap.h>
+#include <asm/pgtable.h>
+#include <linux/const.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+
+#include <asm/book3s/32/mmu-hash.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;
+	u32 pbn = lower & 0xfffe0000;
+	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);
+	seq_printf(m, "0x%08x ", pbn);
+
+	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;
+	u32 brpn = lower & 0xfffe0000;
+	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);
+	seq_printf(m, "0x%08x ", brpn);
+
+	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, "\nData 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 (PVR_VER(mfspr(SPRN_PVR)) == 1)
+		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 bats_init(void)
+{
+	struct dentry *debugfs_file;
+
+	debugfs_file = debugfs_create_file("block_address_translation", 0400,
+					   NULL, NULL, &bats_fops);
+	return debugfs_file ? 0 : -ENOMEM;
+}
+device_initcall(bats_init);
-- 
2.13.3

Re: [PATCH] powerpc/mm: dump block address translation on book3s/32

[Michael Ellerman]

Christophe Leroy <christophe.leroy@c-s.fr> writes:

> This patch adds a debugfs file to dump block address translation:
>
> ~# cat /sys/kernel/debug/block_address_translation

My instinct is it should be in /sys/kernel/debug/powerpc. But I guess
the other page table dump files are not.

> 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: Christophe Leroy <christophe.leroy@c-s.fr>
> ---
>  Tested on mpc8321 aka 603
>  Please review/test the 601 part
>
>  arch/powerpc/mm/Makefile    |   2 +-
>  arch/powerpc/mm/dump_bats.c | 176 ++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 177 insertions(+), 1 deletion(-)
>  create mode 100644 arch/powerpc/mm/dump_bats.c
>
> diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
> index ca96e7be4d0e..2adad10b5856 100644
> --- a/arch/powerpc/mm/Makefile
> +++ b/arch/powerpc/mm/Makefile
> @@ -47,7 +47,7 @@ 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
> +obj-$(CONFIG_PPC_BOOK3S_32)	+= dump_linuxpagetables-generic.o dump_bats.o

BOOK3S_32 covers quite a lot of CPUs.

But below the only check is that you're on 601 or 603.

So is the 603 code going to work on all other BOOK3S_32 CPUs?

cheers

> diff --git a/arch/powerpc/mm/dump_bats.c b/arch/powerpc/mm/dump_bats.c
> new file mode 100644
> index 000000000000..824a94ee9051
> --- /dev/null
> +++ b/arch/powerpc/mm/dump_bats.c
> @@ -0,0 +1,176 @@
> +// 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 <linux/debugfs.h>
> +#include <linux/fs.h>
> +#include <linux/hugetlb.h>
> +#include <linux/io.h>
> +#include <linux/mm.h>
> +#include <linux/sched.h>
> +#include <linux/seq_file.h>
> +#include <asm/fixmap.h>
> +#include <asm/pgtable.h>
> +#include <linux/const.h>
> +#include <asm/page.h>
> +#include <asm/pgalloc.h>
> +
> +#include <asm/book3s/32/mmu-hash.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;
> +	u32 pbn = lower & 0xfffe0000;
> +	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);
> +	seq_printf(m, "0x%08x ", pbn);
> +
> +	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;
> +	u32 brpn = lower & 0xfffe0000;
> +	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);
> +	seq_printf(m, "0x%08x ", brpn);
> +
> +	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, "\nData 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 (PVR_VER(mfspr(SPRN_PVR)) == 1)
> +		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 bats_init(void)
> +{
> +	struct dentry *debugfs_file;
> +
> +	debugfs_file = debugfs_create_file("block_address_translation", 0400,
> +					   NULL, NULL, &bats_fops);
> +	return debugfs_file ? 0 : -ENOMEM;
> +}
> +device_initcall(bats_init);
> -- 
> 2.13.3

Re: [PATCH] powerpc/mm: dump block address translation on book3s/32

[Christophe LEROY]

Le 15/11/2018 à 12:46, Michael Ellerman a écrit :
> Christophe Leroy <christophe.leroy@c-s.fr> writes:
> 
>> This patch adds a debugfs file to dump block address translation:
>>
>> ~# cat /sys/kernel/debug/block_address_translation
> 
> My instinct is it should be in /sys/kernel/debug/powerpc. But I guess
> the other page table dump files are not.

Lol.

Looks like we have the same instinct ...

But you rejected my patch https://patchwork.ozlabs.org/patch/750426/ :)


> 
>> 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: Christophe Leroy <christophe.leroy@c-s.fr>
>> ---
>>   Tested on mpc8321 aka 603
>>   Please review/test the 601 part
>>
>>   arch/powerpc/mm/Makefile    |   2 +-
>>   arch/powerpc/mm/dump_bats.c | 176 ++++++++++++++++++++++++++++++++++++++++++++
>>   2 files changed, 177 insertions(+), 1 deletion(-)
>>   create mode 100644 arch/powerpc/mm/dump_bats.c
>>
>> diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
>> index ca96e7be4d0e..2adad10b5856 100644
>> --- a/arch/powerpc/mm/Makefile
>> +++ b/arch/powerpc/mm/Makefile
>> @@ -47,7 +47,7 @@ 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
>> +obj-$(CONFIG_PPC_BOOK3S_32)	+= dump_linuxpagetables-generic.o dump_bats.o
> 
> BOOK3S_32 covers quite a lot of CPUs.
> 
> But below the only check is that you're on 601 or 603.
> 
> So is the 603 code going to work on all other BOOK3S_32 CPUs?

If I understand function setbat() correctly, it should.

See 
https://elixir.bootlin.com/linux/v4.20-rc1/source/arch/powerpc/mm/ppc_mmu_32.c#L115 
Tell me if you see something I missed.

Christophe

> 
> cheers
> 
>> diff --git a/arch/powerpc/mm/dump_bats.c b/arch/powerpc/mm/dump_bats.c
>> new file mode 100644
>> index 000000000000..824a94ee9051
>> --- /dev/null
>> +++ b/arch/powerpc/mm/dump_bats.c
>> @@ -0,0 +1,176 @@
>> +// 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 <linux/debugfs.h>
>> +#include <linux/fs.h>
>> +#include <linux/hugetlb.h>
>> +#include <linux/io.h>
>> +#include <linux/mm.h>
>> +#include <linux/sched.h>
>> +#include <linux/seq_file.h>
>> +#include <asm/fixmap.h>
>> +#include <asm/pgtable.h>
>> +#include <linux/const.h>
>> +#include <asm/page.h>
>> +#include <asm/pgalloc.h>
>> +
>> +#include <asm/book3s/32/mmu-hash.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;
>> +	u32 pbn = lower & 0xfffe0000;
>> +	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);
>> +	seq_printf(m, "0x%08x ", pbn);
>> +
>> +	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;
>> +	u32 brpn = lower & 0xfffe0000;
>> +	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);
>> +	seq_printf(m, "0x%08x ", brpn);
>> +
>> +	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, "\nData 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 (PVR_VER(mfspr(SPRN_PVR)) == 1)
>> +		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 bats_init(void)
>> +{
>> +	struct dentry *debugfs_file;
>> +
>> +	debugfs_file = debugfs_create_file("block_address_translation", 0400,
>> +					   NULL, NULL, &bats_fops);
>> +	return debugfs_file ? 0 : -ENOMEM;
>> +}
>> +device_initcall(bats_init);
>> -- 
>> 2.13.3

Re: [PATCH] powerpc/mm: dump block address translation on book3s/32

[Michael Ellerman]

Christophe LEROY <christophe.leroy@c-s.fr> writes:

> Le 15/11/2018 à 12:46, Michael Ellerman a écrit :
>> Christophe Leroy <christophe.leroy@c-s.fr> writes:
>> 
>>> This patch adds a debugfs file to dump block address translation:
>>>
>>> ~# cat /sys/kernel/debug/block_address_translation
>> 
>> My instinct is it should be in /sys/kernel/debug/powerpc. But I guess
>> the other page table dump files are not.
>
> Lol.
>
> Looks like we have the same instinct ...
>
> But you rejected my patch https://patchwork.ozlabs.org/patch/750426/ :)

Haha. My argument was that the kernel page table dump is not powerpc
specific, but this file *is* powerpc specific. Though I guess it's in
the same are as the page table / hash table dump, so it may as well live
next to them.

>>> diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
>>> index ca96e7be4d0e..2adad10b5856 100644
>>> --- a/arch/powerpc/mm/Makefile
>>> +++ b/arch/powerpc/mm/Makefile
>>> @@ -47,7 +47,7 @@ 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
>>> +obj-$(CONFIG_PPC_BOOK3S_32)	+= dump_linuxpagetables-generic.o dump_bats.o
>> 
>> BOOK3S_32 covers quite a lot of CPUs.
>> 
>> But below the only check is that you're on 601 or 603.
>> 
>> So is the 603 code going to work on all other BOOK3S_32 CPUs?
>
> If I understand function setbat() correctly, it should.
>
> See 
> https://elixir.bootlin.com/linux/v4.20-rc1/source/arch/powerpc/mm/ppc_mmu_32.c#L115 
> Tell me if you see something I missed.

I don't know those 32-bit CPUs at all, so as long as you've thought
about it that's good enough for me. We can catch bugs in testing anyway.

cheers

Re: [PATCH] powerpc/mm: dump block address translation on book3s/32

[Christophe LEROY]

Le 16/11/2018 à 11:20, Michael Ellerman a écrit :
> Christophe LEROY <christophe.leroy@c-s.fr> writes:
> 
>> Le 15/11/2018 à 12:46, Michael Ellerman a écrit :
>>> Christophe Leroy <christophe.leroy@c-s.fr> writes:
>>>
>>>> This patch adds a debugfs file to dump block address translation:
>>>>
>>>> ~# cat /sys/kernel/debug/block_address_translation
>>>
>>> My instinct is it should be in /sys/kernel/debug/powerpc. But I guess
>>> the other page table dump files are not.
>>
>> Lol.
>>
>> Looks like we have the same instinct ...
>>
>> But you rejected my patch https://patchwork.ozlabs.org/patch/750426/ :)
> 
> Haha. My argument was that the kernel page table dump is not powerpc
> specific, but this file *is* powerpc specific. Though I guess it's in
> the same are as the page table / hash table dump, so it may as well live
> next to them.

I see you took the first version in next-test. It doesn't handle the 
case of 64bits phys addresses. v3 does.

I just sent v4 which does to v3 the changes you did (__init and powerpc/ 
subdir)

Christophe

> 
>>>> diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
>>>> index ca96e7be4d0e..2adad10b5856 100644
>>>> --- a/arch/powerpc/mm/Makefile
>>>> +++ b/arch/powerpc/mm/Makefile
>>>> @@ -47,7 +47,7 @@ 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
>>>> +obj-$(CONFIG_PPC_BOOK3S_32)	+= dump_linuxpagetables-generic.o dump_bats.o
>>>
>>> BOOK3S_32 covers quite a lot of CPUs.
>>>
>>> But below the only check is that you're on 601 or 603.
>>>
>>> So is the 603 code going to work on all other BOOK3S_32 CPUs?
>>
>> If I understand function setbat() correctly, it should.
>>
>> See
>> https://elixir.bootlin.com/linux/v4.20-rc1/source/arch/powerpc/mm/ppc_mmu_32.c#L115
>> Tell me if you see something I missed.
> 
> I don't know those 32-bit CPUs at all, so as long as you've thought
> about it that's good enough for me. We can catch bugs in testing anyway.
> 
> cheers
> 

Re: [PATCH] powerpc/mm: dump block address translation on book3s/32

[Michael Ellerman]

Christophe LEROY <christophe.leroy@c-s.fr> writes:

> Le 16/11/2018 à 11:20, Michael Ellerman a écrit :
>> Christophe LEROY <christophe.leroy@c-s.fr> writes:
>> 
>>> Le 15/11/2018 à 12:46, Michael Ellerman a écrit :
>>>> Christophe Leroy <christophe.leroy@c-s.fr> writes:
>>>>
>>>>> This patch adds a debugfs file to dump block address translation:
>>>>>
>>>>> ~# cat /sys/kernel/debug/block_address_translation
>>>>
>>>> My instinct is it should be in /sys/kernel/debug/powerpc. But I guess
>>>> the other page table dump files are not.
>>>
>>> Lol.
>>>
>>> Looks like we have the same instinct ...
>>>
>>> But you rejected my patch https://patchwork.ozlabs.org/patch/750426/ :)
>> 
>> Haha. My argument was that the kernel page table dump is not powerpc
>> specific, but this file *is* powerpc specific. Though I guess it's in
>> the same are as the page table / hash table dump, so it may as well live
>> next to them.
>
> I see you took the first version in next-test. It doesn't handle the 
> case of 64bits phys addresses. v3 does.
>
> I just sent v4 which does to v3 the changes you did (__init and powerpc/ 
> subdir)

Thanks, have picked up v4.

cheers

Re: [PATCH] powerpc/mm: dump block address translation on book3s/32

[Michael Ellerman]

Christophe LEROY <christophe.leroy@c-s.fr> writes:

> Le 16/11/2018 à 11:20, Michael Ellerman a écrit :
>> Christophe LEROY <christophe.leroy@c-s.fr> writes:
>> 
>>> Le 15/11/2018 à 12:46, Michael Ellerman a écrit :
>>>> Christophe Leroy <christophe.leroy@c-s.fr> writes:
>>>>
>>>>> This patch adds a debugfs file to dump block address translation:
>>>>>
>>>>> ~# cat /sys/kernel/debug/block_address_translation
>>>>
>>>> My instinct is it should be in /sys/kernel/debug/powerpc. But I guess
>>>> the other page table dump files are not.
>>>
>>> Lol.
>>>
>>> Looks like we have the same instinct ...
>>>
>>> But you rejected my patch https://patchwork.ozlabs.org/patch/750426/ :)
>> 
>> Haha. My argument was that the kernel page table dump is not powerpc
>> specific, but this file *is* powerpc specific. Though I guess it's in
>> the same are as the page table / hash table dump, so it may as well live
>> next to them.
>
> I see you took the first version in next-test. It doesn't handle the 
> case of 64bits phys addresses. v3 does.
>
> I just sent v4 which does to v3 the changes you did (__init and powerpc/ 
> subdir)

Thanks.

cheers