[POWERPC] kdump: Reserve the existing TCE mappings left by the first kernel

[linux-2.6-omap-h63xx.git] / arch / powerpc / platforms / pseries / iommu.c

diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index d03a8b078f9db09ffa72cffbd01cba8aa4cc8413..8cfb5706790ecd395bd7039463a435a6a0574405 100644 (file)
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -92,6 +92,15 @@ static void tce_free_pSeries(struct iommu_table *tbl, long index, long npages)
                *(tcep++) = 0;
 }
 
+static unsigned long tce_get_pseries(struct iommu_table *tbl, long index)
+{
+       u64 *tcep;
+
+       index <<= TCE_PAGE_FACTOR;
+       tcep = ((u64 *)tbl->it_base) + index;
+
+       return *tcep;
+}
 
 static void tce_build_pSeriesLP(struct iommu_table *tbl, long tcenum,
                                long npages, unsigned long uaddr,
@@ -235,6 +244,25 @@ static void tce_freemulti_pSeriesLP(struct iommu_table *tbl, long tcenum, long n
        }
 }
 
+static unsigned long tce_get_pSeriesLP(struct iommu_table *tbl, long tcenum)
+{
+       u64 rc;
+       unsigned long tce_ret;
+
+       tcenum <<= TCE_PAGE_FACTOR;
+       rc = plpar_tce_get((u64)tbl->it_index, (u64)tcenum << 12, &tce_ret);
+
+       if (rc && printk_ratelimit()) {
+               printk("tce_get_pSeriesLP: plpar_tce_get failed. rc=%ld\n",
+                       rc);
+               printk("\tindex   = 0x%lx\n", (u64)tbl->it_index);
+               printk("\ttcenum  = 0x%lx\n", (u64)tcenum);
+               show_stack(current, (unsigned long *)__get_SP());
+       }
+
+       return tce_ret;
+}
+
 static void iommu_table_setparms(struct pci_controller *phb,
                                 struct device_node *dn,
                                 struct iommu_table *tbl)
@@ -254,7 +282,10 @@ static void iommu_table_setparms(struct pci_controller *phb,
        }
 
        tbl->it_base = (unsigned long)__va(*basep);
+
+#ifndef CONFIG_CRASH_DUMP
        memset((void *)tbl->it_base, 0, *sizep);
+#endif
 
        tbl->it_busno = phb->bus->number;
 
@@ -560,11 +591,13 @@ void iommu_init_early_pSeries(void)
                        ppc_md.tce_build = tce_build_pSeriesLP;
                        ppc_md.tce_free  = tce_free_pSeriesLP;
                }
+               ppc_md.tce_get   = tce_get_pSeriesLP;
                ppc_md.iommu_bus_setup = iommu_bus_setup_pSeriesLP;
                ppc_md.iommu_dev_setup = iommu_dev_setup_pSeriesLP;
        } else {
                ppc_md.tce_build = tce_build_pSeries;
                ppc_md.tce_free  = tce_free_pSeries;
+               ppc_md.tce_get   = tce_get_pseries;
                ppc_md.iommu_bus_setup = iommu_bus_setup_pSeries;
                ppc_md.iommu_dev_setup = iommu_dev_setup_pSeries;
        }