powerpc: Make CMO paging space pool ID and page size available

During platform setup, save off the primary/secondary paging space
pool IDs and the page size.  Added accessors in hvcall.h for these
variables.  This is needed for a subsequent fix.

Submitted-by: Robert Jennings <rcj@linux.vnet.ibm.com>

Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 42 insertions, 8 deletions

diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h
index fbe2932fa9e9..6251a4b10be7 100644
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -291,6 +291,28 @@ struct hvcall_mpp_data {
 };
 
 int h_get_mpp(struct hvcall_mpp_data *);
+
+#ifdef CONFIG_PPC_PSERIES
+extern int CMO_PrPSP;
+extern int CMO_SecPSP;
+extern unsigned long CMO_PageSize;
+
+static inline int cmo_get_primary_psp(void)
+{
+        return CMO_PrPSP;
+}
+
+static inline int cmo_get_secondary_psp(void)
+{
+        return CMO_SecPSP;
+}
+
+static inline unsigned long cmo_get_page_size(void)
+{
+        return CMO_PageSize;
+}
+#endif /* CONFIG_PPC_PSERIES */
+
 #endif /* __ASSEMBLY__ */
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_HVCALL_H */
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 063a0d2fba30..3ce8a139b85d 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -68,6 +68,9 @@
 #include "plpar_wrappers.h"
 #include "pseries.h"
 
+int CMO_PrPSP = -1;
+int CMO_SecPSP = -1;
+unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);
 
 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
 
@@ -325,8 +328,7 @@ void pSeries_cmo_feature_init(void)
 {
         char *ptr, *key, *value, *end;
         int call_status;
-        int PrPSP = -1;
-        int SecPSP = -1;
+        int page_order = IOMMU_PAGE_SHIFT;
 
         pr_debug(" -> fw_cmo_feature_init()\n");
         spin_lock(&rtas_data_buf_lock);
@@ -365,21 +367,31 @@ void pSeries_cmo_feature_init(void)
                                 break;
                         }
 
-                        if (0 == strcmp(key, "PrPSP"))
-                                PrPSP = simple_strtol(value, NULL, 10);
+                        if (0 == strcmp(key, "CMOPageSize"))
+                                page_order = simple_strtol(value, NULL, 10);
+                        else if (0 == strcmp(key, "PrPSP"))
+                                CMO_PrPSP = simple_strtol(value, NULL, 10);
                         else if (0 == strcmp(key, "SecPSP"))
-                                SecPSP = simple_strtol(value, NULL, 10);
+                                CMO_SecPSP = simple_strtol(value, NULL, 10);
                         value = key = ptr + 1;
                 }
                 ptr++;
         }
 
-        if (PrPSP != -1 || SecPSP != -1) {
+        /* Page size is returned as the power of 2 of the page size,
+         * convert to the page size in bytes before returning
+         */
+        CMO_PageSize = 1 << page_order;
+        pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
+
+        if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
                 pr_info("CMO enabled\n");
-                pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", PrPSP, SecPSP);
+                pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
+                         CMO_SecPSP);
                 powerpc_firmware_features |= FW_FEATURE_CMO;
         } else
-                pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", PrPSP, SecPSP);
+                pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
+                         CMO_SecPSP);
         spin_unlock(&rtas_data_buf_lock);
         pr_debug(" <- fw_cmo_feature_init()\n");
 }