powerpc/pseries: Enable CMO feature during platform setup

For Cooperative Memory Overcommitment (CMO), set the FW_FEATURE_CMO
flag in powerpc_firmware_features from the rtas ibm,get-system-parameters
table prior to calling iommu_init_early_pSeries.

With this, any CMO specific functionality can be controlled by checking:
 firmware_has_feature(FW_FEATURE_CMO)

Signed-off-by: Robert Jennings <rcj@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 71 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 90beb444e1dd..063a0d2fba30 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -314,6 +314,76 @@ static int pseries_set_xdabr(unsigned long dabr)
                         H_DABRX_KERNEL | H_DABRX_USER);
 }
 
+#define CMO_CHARACTERISTICS_TOKEN 44
+#define CMO_MAXLENGTH 1026
+
+/**
+ * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
+ * handle that here. (Stolen from parse_system_parameter_string)
+ */
+void pSeries_cmo_feature_init(void)
+{
+        char *ptr, *key, *value, *end;
+        int call_status;
+        int PrPSP = -1;
+        int SecPSP = -1;
+
+        pr_debug(" -> fw_cmo_feature_init()\n");
+        spin_lock(&rtas_data_buf_lock);
+        memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
+        call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
+                                NULL,
+                                CMO_CHARACTERISTICS_TOKEN,
+                                __pa(rtas_data_buf),
+                                RTAS_DATA_BUF_SIZE);
+
+        if (call_status != 0) {
+                spin_unlock(&rtas_data_buf_lock);
+                pr_debug("CMO not available\n");
+                pr_debug(" <- fw_cmo_feature_init()\n");
+                return;
+        }
+
+        end = rtas_data_buf + CMO_MAXLENGTH - 2;
+        ptr = rtas_data_buf + 2;        /* step over strlen value */
+        key = value = ptr;
+
+        while (*ptr && (ptr <= end)) {
+                /* Separate the key and value by replacing '=' with '\0' and
+                 * point the value at the string after the '='
+                 */
+                if (ptr[0] == '=') {
+                        ptr[0] = '\0';
+                        value = ptr + 1;
+                } else if (ptr[0] == '\0' || ptr[0] == ',') {
+                        /* Terminate the string containing the key/value pair */
+                        ptr[0] = '\0';
+
+                        if (key == value) {
+                                pr_debug("Malformed key/value pair\n");
+                                /* Never found a '=', end processing */
+                                break;
+                        }
+
+                        if (0 == strcmp(key, "PrPSP"))
+                                PrPSP = simple_strtol(value, NULL, 10);
+                        else if (0 == strcmp(key, "SecPSP"))
+                                SecPSP = simple_strtol(value, NULL, 10);
+                        value = key = ptr + 1;
+                }
+                ptr++;
+        }
+
+        if (PrPSP != -1 || SecPSP != -1) {
+                pr_info("CMO enabled\n");
+                pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", PrPSP, SecPSP);
+                powerpc_firmware_features |= FW_FEATURE_CMO;
+        } else
+                pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", PrPSP, SecPSP);
+        spin_unlock(&rtas_data_buf_lock);
+        pr_debug(" <- fw_cmo_feature_init()\n");
+}
+
 /*
  * Early initialization.  Relocation is on but do not reference unbolted pages
  */
@@ -329,6 +399,7 @@ static void __init pSeries_init_early(void)
         else if (firmware_has_feature(FW_FEATURE_XDABR))
                 ppc_md.set_dabr = pseries_set_xdabr;
 
+        pSeries_cmo_feature_init();
         iommu_init_early_pSeries();
 
         pr_debug(" <- pSeries_init_early()\n");