From: Benjamin Herrenschmidt <benh@kernel•crashing.org>
To: <linuxppc-dev@ozlabs•org>
Subject: [RFC/PATCH 6/9] powerpc: Add xmon function to dump 44x TLB
Date: Mon, 19 Nov 2007 19:25:05 +1100 [thread overview]
Message-ID: <20071119082553.00E25DDE34@ozlabs.org> (raw)
In-Reply-To: <1195460700.350036.781662541765.qpush@grosgo>
This adds a function to xmon to dump the content of the 44x processor
TLB with a little bit of decoding (but not much).
Signed-off-by: Benjamin Herrenschmidt <benh@kernel•crashing.org>
---
Did that to track down some machine checks I was having while working
on PCI support due to 32/64 bits resource screwage.
Useful to see where a given MMIO virtual address really maps to.
arch/powerpc/xmon/xmon.c | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
Index: linux-work/arch/powerpc/xmon/xmon.c
===================================================================
--- linux-work.orig/arch/powerpc/xmon/xmon.c 2007-11-16 16:33:03.000000000 +1100
+++ linux-work/arch/powerpc/xmon/xmon.c 2007-11-16 16:50:45.000000000 +1100
@@ -153,6 +153,10 @@ static const char *getvecname(unsigned l
static int do_spu_cmd(void);
+#ifdef CONFIG_44x
+static void dump_tlb_44x(void);
+#endif
+
int xmon_no_auto_backtrace;
extern void xmon_enter(void);
@@ -231,6 +235,9 @@ Commands:\n\
#ifdef CONFIG_PPC_STD_MMU_32
" u dump segment registers\n"
#endif
+#ifdef CONFIG_44x
+" u dump TLB\n"
+#endif
" ? help\n"
" zr reboot\n\
zh halt\n"
@@ -856,6 +863,11 @@ cmds(struct pt_regs *excp)
dump_segments();
break;
#endif
+#ifdef CONFIG_4xx
+ case 'u':
+ dump_tlb_44x();
+ break;
+#endif
default:
printf("Unrecognized command: ");
do {
@@ -2581,6 +2593,32 @@ void dump_segments(void)
}
#endif
+#ifdef CONFIG_44x
+static void dump_tlb_44x(void)
+{
+ int i;
+
+ for (i = 0; i < PPC44x_TLB_SIZE; i++) {
+ unsigned long w0,w1,w2;
+ asm volatile("tlbre %0,%1,0" : "=r" (w0) : "r" (i));
+ asm volatile("tlbre %0,%1,1" : "=r" (w1) : "r" (i));
+ asm volatile("tlbre %0,%1,2" : "=r" (w2) : "r" (i));
+ printf("[%02x] %08x %08x %08x ", i, w0, w1, w2);
+ if (w0 & PPC44x_TLB_VALID) {
+ printf("V %08x -> %01x%08x %c%c%c%c%c",
+ w0 & PPC44x_TLB_EPN_MASK,
+ w1 & PPC44x_TLB_ERPN_MASK,
+ w1 & PPC44x_TLB_RPN_MASK,
+ (w2 & PPC44x_TLB_W) ? 'W' : 'w',
+ (w2 & PPC44x_TLB_I) ? 'I' : 'i',
+ (w2 & PPC44x_TLB_M) ? 'M' : 'm',
+ (w2 & PPC44x_TLB_G) ? 'G' : 'g',
+ (w2 & PPC44x_TLB_E) ? 'E' : 'e');
+ }
+ printf("\n");
+ }
+}
+#endif /* CONFIG_44x */
void xmon_init(int enable)
{
#ifdef CONFIG_PPC_ISERIES
next prev parent reply other threads:[~2007-11-19 8:25 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-19 8:25 [RFC/PATCH 0/9] powerpc: 4xx PCI work in progress Benjamin Herrenschmidt
2007-11-19 8:25 ` [RFC/PATCH 1/9] powerpc: Make isa_mem_base common to 32 and 64 bits Benjamin Herrenschmidt
2007-11-19 10:32 ` Christoph Hellwig
2007-11-19 19:49 ` Benjamin Herrenschmidt
2007-11-19 8:25 ` [RFC/PATCH 2/9] powerpc: Merge pci_process_bridge_OF_ranges() Benjamin Herrenschmidt
2007-11-19 8:25 ` [RFC/PATCH 3/9] powerpc: Fix declaration of pcibios_free_controller Benjamin Herrenschmidt
2007-11-19 8:25 ` [RFC/PATCH 4/9] powerpc: Fix powerpc 32 bits resource fixup for 64 bits resources Benjamin Herrenschmidt
2007-11-19 8:25 ` [RFC/PATCH 5/9] powerpc: Fix 440/440A machine check handling Benjamin Herrenschmidt
2007-11-19 8:25 ` Benjamin Herrenschmidt [this message]
2007-11-19 8:25 ` [RFC/PATCH 7/9] powerpc: Fix kmalloc alignmenent on non-coherent DMA Benjamin Herrenschmidt
2007-11-19 8:25 ` [RFC/PATCH 8/9] powerpc 4xx PCI support Benjamin Herrenschmidt
2007-11-19 8:25 ` [RFC/PATCH 9/9] powerpc: PCI support for 4xx Ebony board Benjamin Herrenschmidt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20071119082553.00E25DDE34@ozlabs.org \
--to=benh@kernel$(echo .)crashing.org \
--cc=linuxppc-dev@ozlabs$(echo .)org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox