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authorRobert Jennings <rcj@linux.vnet.ibm.com>2008-07-24 04:29:03 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-25 15:44:42 +1000
commite46de429cb954d30a5642fba81d516ede518c65e (patch)
treeb04b9fb575c5d4c0cddbb891d6621729820a3027 /arch/powerpc/platforms/pseries/setup.c
parent398778f78b76fb72cb18411487af01dea202709e (diff)
downloadlinaro-lsk-e46de429cb954d30a5642fba81d516ede518c65e.tar.gz
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>
Diffstat (limited to 'arch/powerpc/platforms/pseries/setup.c')
-rw-r--r--arch/powerpc/platforms/pseries/setup.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 90beb444e1d..063a0d2fba3 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");