Re: [PATCH v7 7/9] powerpc/pseries: Dump the SLB contents on SLB MCE errors.

On 08/09/2018 06:35 AM, Michael Ellerman wrote:

Mahesh J Salgaonkar [off-list ref] writes:

quoted

diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h
index 7f22929ce915..233d25ff6f64 100644
--- a/arch/powerpc/include/asm/paca.h
+++ b/arch/powerpc/include/asm/paca.h

@@ -254,6 +254,10 @@ struct paca_struct {
 #endif
 #ifdef CONFIG_PPC_PSERIES
 	u8 *mce_data_buf;		/* buffer to hold per cpu rtas errlog */
+
+	/* Capture SLB related old contents in MCE handler. */
+	struct slb_entry *mce_faulty_slbs;
+	u16 slb_save_cache_ptr;
 #endif /* CONFIG_PPC_PSERIES */

             ^^^^^^^^^^^^^^^^^

I will pull that out of CONFIG_PPC_PSERIES.

quoted

diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c
index e89f675f1b5e..16a53689ffd4 100644
--- a/arch/powerpc/mm/slb.c
+++ b/arch/powerpc/mm/slb.c

@@ -151,6 +151,79 @@ void slb_flush_and_rebolt_realmode(void)
 	get_paca()->slb_cache_ptr = 0;
 }
 
+void slb_save_contents(struct slb_entry *slb_ptr)
+{
+	int i;
+	unsigned long e, v;
+
+	/* Save slb_cache_ptr value. */
+	get_paca()->slb_save_cache_ptr = get_paca()->slb_cache_ptr;

This isn't inside CONFIG_PPC_PSERIES which breaks lots of configs, eg
powernv.

  arch/powerpc/mm/slb.c:160:12: error: 'struct paca_struct' has no member named 'slb_save_cache_ptr'
  arch/powerpc/mm/slb.c:218:27: error: 'struct paca_struct' has no member named 'slb_save_cache_ptr'
  arch/powerpc/mm/slb.c:216:49: error: 'struct paca_struct' has no member named 'slb_save_cache_ptr'

http://kisskb.ozlabs.ibm.com/kisskb/head/219f20e490add009194d94fdeb480da2e385f1c6/

cheers

Ouch.. my bad. Will fix it.

Thanks,
-Mahesh.