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>

diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 90beb444e1dd670f64836fdceff20c247b79ed07..063a0d2fba30e2576771a300460220c4e21c4cec 100644 (file)
--- 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");

diff --git a/include/asm-powerpc/firmware.h b/include/asm-powerpc/firmware.h
index ef328995ba9dd9cd3537aeabbcb8be05f5f1e13c..3a179827528d1b8ad53f998fec23d4fd788c77f1 100644 (file)
--- a/include/asm-powerpc/firmware.h
+++ b/include/asm-powerpc/firmware.h
@@ -46,6 +46,7 @@
 #define FW_FEATURE_PS3_LV1     ASM_CONST(0x0000000000800000)
 #define FW_FEATURE_BEAT                ASM_CONST(0x0000000001000000)
 #define FW_FEATURE_BULK_REMOVE ASM_CONST(0x0000000002000000)
+#define FW_FEATURE_CMO         ASM_CONST(0x0000000004000000)
 
 #ifndef __ASSEMBLY__
 
@@ -58,7 +59,7 @@ enum {
                FW_FEATURE_MIGRATE | FW_FEATURE_PERFMON | FW_FEATURE_CRQ |
                FW_FEATURE_VIO | FW_FEATURE_RDMA | FW_FEATURE_LLAN |
                FW_FEATURE_BULK | FW_FEATURE_XDABR | FW_FEATURE_MULTITCE |
-               FW_FEATURE_SPLPAR | FW_FEATURE_LPAR,
+               FW_FEATURE_SPLPAR | FW_FEATURE_LPAR | FW_FEATURE_CMO,
        FW_FEATURE_PSERIES_ALWAYS = 0,
        FW_FEATURE_ISERIES_POSSIBLE = FW_FEATURE_ISERIES | FW_FEATURE_LPAR,
        FW_FEATURE_ISERIES_ALWAYS = FW_FEATURE_ISERIES | FW_FEATURE_LPAR,