[CELL] saving spus information for kexec crash

This patch adds support for investigating spus information after a
kernel crash event, through kdump vmcore file.
Implementation is based on xmon code, but the new functionality was
kept independent from xmon.

Signed-off-by: Lucio Jose Herculano Correia <luciojhc@br.ibm.com>
Signed-off-by: Andre Detsch <adetsch@br.ibm.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

diff --git a/arch/powerpc/kernel/crash.c b/arch/powerpc/kernel/crash.c
index d3f2080d2eeeb3719778352b7f39c4bb2ce7b637..37658ea417fa923b280ef92858209a303b85bb73 100644 (file)
--- a/arch/powerpc/kernel/crash.c
+++ b/arch/powerpc/kernel/crash.c
@@ -219,6 +219,72 @@ void crash_kexec_secondary(struct pt_regs *regs)
        cpus_in_sr = CPU_MASK_NONE;
 }
 #endif
+#ifdef CONFIG_SPU_BASE
+
+#include <asm/spu.h>
+#include <asm/spu_priv1.h>
+
+struct crash_spu_info {
+       struct spu *spu;
+       u32 saved_spu_runcntl_RW;
+       u32 saved_spu_status_R;
+       u32 saved_spu_npc_RW;
+       u64 saved_mfc_sr1_RW;
+       u64 saved_mfc_dar;
+       u64 saved_mfc_dsisr;
+};
+
+#define CRASH_NUM_SPUS 16      /* Enough for current hardware */
+static struct crash_spu_info crash_spu_info[CRASH_NUM_SPUS];
+
+static void crash_kexec_stop_spus(void)
+{
+       struct spu *spu;
+       int i;
+       u64 tmp;
+
+       for (i = 0; i < CRASH_NUM_SPUS; i++) {
+               if (!crash_spu_info[i].spu)
+                       continue;
+
+               spu = crash_spu_info[i].spu;
+
+               crash_spu_info[i].saved_spu_runcntl_RW =
+                       in_be32(&spu->problem->spu_runcntl_RW);
+               crash_spu_info[i].saved_spu_status_R =
+                       in_be32(&spu->problem->spu_status_R);
+               crash_spu_info[i].saved_spu_npc_RW =
+                       in_be32(&spu->problem->spu_npc_RW);
+
+               crash_spu_info[i].saved_mfc_dar    = spu_mfc_dar_get(spu);
+               crash_spu_info[i].saved_mfc_dsisr  = spu_mfc_dsisr_get(spu);
+               tmp = spu_mfc_sr1_get(spu);
+               crash_spu_info[i].saved_mfc_sr1_RW = tmp;
+
+               tmp &= ~MFC_STATE1_MASTER_RUN_CONTROL_MASK;
+               spu_mfc_sr1_set(spu, tmp);
+
+               __delay(200);
+       }
+}
+
+void crash_register_spus(struct list_head *list)
+{
+       struct spu *spu;
+
+       list_for_each_entry(spu, list, full_list) {
+               if (WARN_ON(spu->number >= CRASH_NUM_SPUS))
+                       continue;
+
+               crash_spu_info[spu->number].spu = spu;
+       }
+}
+
+#else
+static inline void crash_kexec_stop_spus(void)
+{
+}
+#endif /* CONFIG_SPU_BASE */
 
 void default_machine_crash_shutdown(struct pt_regs *regs)
 {
@@ -254,6 +320,7 @@ void default_machine_crash_shutdown(struct pt_regs *regs)
        crash_save_cpu(regs, crashing_cpu);
        crash_kexec_prepare_cpus(crashing_cpu);
        cpu_set(crashing_cpu, cpus_in_crash);
+       crash_kexec_stop_spus();
        if (ppc_md.kexec_cpu_down)
                ppc_md.kexec_cpu_down(1, 0);
 }

diff --git a/arch/powerpc/platforms/cell/spu_base.c b/arch/powerpc/platforms/cell/spu_base.c
index 96a8f609690ce846b1d7c58fa04f39b6f1206c02..c563066e640dc5b865731265401607adb1c74234 100644 (file)
--- a/arch/powerpc/platforms/cell/spu_base.c
+++ b/arch/powerpc/platforms/cell/spu_base.c
@@ -676,7 +676,7 @@ static int __init init_spu_base(void)
        }
 
        xmon_register_spus(&spu_full_list);
-
+       crash_register_spus(&spu_full_list);
        spu_add_sysdev_attr(&attr_stat);
 
        return 0;

diff --git a/include/asm-powerpc/spu.h b/include/asm-powerpc/spu.h
index eedc828cef2dc31a9fcbec613a99590017e1da9c..42d88a6d2dfd021497195d00773e007a96845815 100644 (file)
--- a/include/asm-powerpc/spu.h
+++ b/include/asm-powerpc/spu.h
@@ -188,6 +188,14 @@ int spu_irq_class_0_bottom(struct spu *spu);
 int spu_irq_class_1_bottom(struct spu *spu);
 void spu_irq_setaffinity(struct spu *spu, int cpu);
 
+#ifdef CONFIG_KEXEC
+void crash_register_spus(struct list_head *list);
+#else
+static inline void crash_register_spus(struct list_head *list)
+{
+}
+#endif
+
 extern void spu_invalidate_slbs(struct spu *spu);
 extern void spu_associate_mm(struct spu *spu, struct mm_struct *mm);