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authorJeremy Kerr <jk@ozlabs.org>2014-12-15 09:47:39 +0800
committerJeremy Kerr <jk@ozlabs.org>2014-12-15 15:47:40 +0800
commit2e05b1dd0490ce7ecdd15f522e6c700bc6522062 (patch)
tree5ef88f31906e6dcd4e2079b396a8cd6bbf61fb98 /discover/platform-powerpc.c
parentd3e95283e69d3099fe9f36e56be1f645f565c843 (diff)
downloadpetitboot-2e05b1dd0490ce7ecdd15f522e6c700bc6522062.zip
petitboot-2e05b1dd0490ce7ecdd15f522e6c700bc6522062.tar.gz
discover/platform-powerpc: Implement direct IPMI interface
This change adds a direct IPMI interface to the /dev/ipmi0 device node, which is present on OpenPower machines. Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Diffstat (limited to 'discover/platform-powerpc.c')
-rw-r--r--discover/platform-powerpc.c97
1 files changed, 96 insertions, 1 deletions
diff --git a/discover/platform-powerpc.c b/discover/platform-powerpc.c
index 5f6772f..0440eb4 100644
--- a/discover/platform-powerpc.c
+++ b/discover/platform-powerpc.c
@@ -21,6 +21,7 @@
static const char *partition = "common";
static const char *sysparams_dir = "/sys/firmware/opal/sysparams/";
static const char *devtree_dir = "/proc/device-tree/";
+static const int ipmi_timeout = 500; /* milliseconds */
struct param {
char *name;
@@ -31,6 +32,8 @@ struct param {
struct platform_powerpc {
struct list params;
+ struct ipmi *ipmi;
+ bool ipmi_bootdev_persistent;
int (*get_ipmi_bootdev)(
struct platform_powerpc *platform,
uint8_t *bootdev, bool *persistent);
@@ -705,6 +708,91 @@ static int get_ipmi_bootdev_sysparams(
return 0;
}
+static int clear_ipmi_bootdev_ipmi(struct platform_powerpc *platform)
+{
+ uint16_t resp_len;
+ uint8_t resp[1];
+ uint8_t req[] = {
+ 0x05, /* parameter selector: boot flags */
+ 0x80, /* data 1: valid */
+ 0x00, /* data 2: bootdev: no override */
+ 0x00, /* data 3: system defaults */
+ 0x00, /* data 4: no request for shared mode, mux defaults */
+ 0x00, /* data 5: no instance request */
+ };
+
+ resp_len = sizeof(resp);
+
+ ipmi_transaction(platform->ipmi, IPMI_NETFN_CHASSIS,
+ IPMI_CMD_CHASSIS_SET_SYSTEM_BOOT_OPTIONS,
+ req, sizeof(req),
+ resp, &resp_len,
+ ipmi_timeout);
+ return 0;
+}
+
+static int get_ipmi_bootdev_ipmi(struct platform_powerpc *platform,
+ uint8_t *bootdev, bool *persistent)
+{
+ uint16_t resp_len;
+ uint8_t resp[8];
+ int rc;
+ uint8_t req[] = {
+ 0x05, /* parameter selector: boot flags */
+ 0x00, /* no set selector */
+ 0x00, /* no block selector */
+ };
+
+ resp_len = sizeof(resp);
+ rc = ipmi_transaction(platform->ipmi, IPMI_NETFN_CHASSIS,
+ IPMI_CMD_CHASSIS_GET_SYSTEM_BOOT_OPTIONS,
+ req, sizeof(req),
+ resp, &resp_len,
+ ipmi_timeout);
+ if (rc) {
+ pb_log("platform: error reading IPMI boot options\n");
+ return -1;
+ }
+
+ if (resp_len != sizeof(resp)) {
+ pb_log("platform: unexpected length (%d) in "
+ "boot options response\n", resp_len);
+ return -1;
+ }
+
+ if (resp[0] != 0) {
+ pb_log("platform: non-zero completion code %d from IPMI req\n",
+ resp[0]);
+ return -1;
+ }
+
+ /* check for correct parameter version */
+ if ((resp[1] & 0xf) != 0x1) {
+ pb_log("platform: unexpected version (0x%x) in "
+ "boot options response\n", resp[0]);
+ return -1;
+ }
+
+ /* check for valid paramters */
+ if (resp[2] & 0x80) {
+ pb_debug("platform: boot options are invalid/locked\n");
+ return -1;
+ }
+
+ *persistent = false;
+
+ /* check for valid flags */
+ if (!(resp[3] & 0x80)) {
+ pb_debug("platform: boot flags are invalid, ignoring\n");
+ return 0;
+ }
+
+ *persistent = resp[3] & 0x40;
+ *bootdev = (resp[4] >> 2) & 0x0f;
+ return 0;
+}
+
+
static int load_config(struct platform *p, struct config *config)
{
struct platform_powerpc *platform = to_platform_powerpc(p);
@@ -792,7 +880,13 @@ static bool probe(struct platform *p, void *ctx)
p->platform_data = platform;
- if (!stat(sysparams_dir, &statbuf)) {
+ if (ipmi_present()) {
+ pb_debug("platform: using direct IPMI for IPMI paramters\n");
+ platform->ipmi = ipmi_open(platform);
+ platform->get_ipmi_bootdev = get_ipmi_bootdev_ipmi;
+ platform->clear_ipmi_bootdev = clear_ipmi_bootdev_ipmi;
+
+ } else if (!stat(sysparams_dir, &statbuf)) {
pb_debug("platform: using sysparams for IPMI paramters\n");
platform->get_ipmi_bootdev = get_ipmi_bootdev_sysparams;
platform->clear_ipmi_bootdev = clear_ipmi_bootdev_sysparams;
@@ -800,6 +894,7 @@ static bool probe(struct platform *p, void *ctx)
} else {
pb_log("platform: no IPMI parameter support\n");
}
+
return true;
}
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