[PATCH 1/3 v2] powerpc: make CMO paging space pool ID and page size available

[Robert Jennings <rcj@linux.vnet.ibm.com>]

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

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

---
I wrote "Submitted-by" on the last patch for some strange reason, that't
the only thing changed here.

---
 arch/powerpc/include/asm/hvcall.h      |   21 +++++++++++++++++++++
 arch/powerpc/platforms/pseries/setup.c |   28 ++++++++++++++++++++--------
 2 files changed, 41 insertions(+), 8 deletions(-)

Index: b/arch/powerpc/include/asm/hvcall.h
===================================================================
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -292,6 +292,27 @@ 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 */
Index: b/arch/powerpc/platforms/pseries/setup.c
===================================================================
--- 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");
 }

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