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authorDasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com>2013-10-03 18:06:23 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-10-05 18:01:42 -0700
commitaf190494f9b2e1fb6e1c039e9626c3c334717da1 (patch)
tree3c6b5168cd9e3bd9455380ca5360a4a250820ab0 /Documentation/mic/mpssd
parent12b3af3096cdfb0613da374021167868c6abc9ce (diff)
misc: mic: Enable OSPM suspend and resume support.
This patch enables support for OSPM suspend and resume in the MIC driver. During a host suspend event, the driver performs an orderly shutdown of the cards if they are online. Upon resume, any cards that were previously online before suspend are rebooted. The driver performs an orderly shutdown of the card primarily to ensure that applications in the card are terminated and mounted devices are safely un-mounted before the card is powered down in the event of an OSPM suspend. The driver makes use of the MIC daemon to accomplish OSPM suspend and resume. The driver registers a PM notifier per MIC device. The devices get notified synchronously during PM_SUSPEND_PREPARE and PM_POST_SUSPEND phases. During the PM_SUSPEND_PREPARE phase, the driver performs one of the following three tasks. 1) If the card is 'offline', the driver sets the card to a 'suspended' state and returns. 2) If the card is 'online', the driver initiates card shutdown by setting the card state to suspending. This notifies the MIC daemon which invokes shutdown and sets card state to 'suspended'. The driver returns after the shutdown is complete. 3) If the card is already being shutdown, possibly by a host user space application, the driver sets the card state to 'suspended' and returns after the shutdown is complete. During the PM_POST_SUSPEND phase, the driver simply notifies the daemon and returns. The daemon boots those cards that were previously online during the suspend phase. Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com> Signed-off-by: Nikhil Rao <nikhil.rao@intel.com> Signed-off-by: Harshavardhan R Kharche <harshavardhan.r.kharche@intel.com> Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com> Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/mic/mpssd')
-rw-r--r--Documentation/mic/mpssd/mpssd.c27
-rw-r--r--Documentation/mic/mpssd/mpssd.h1
2 files changed, 24 insertions, 4 deletions
diff --git a/Documentation/mic/mpssd/mpssd.c b/Documentation/mic/mpssd/mpssd.c
index 82c6bc2e3cb6..0c980ad40b17 100644
--- a/Documentation/mic/mpssd/mpssd.c
+++ b/Documentation/mic/mpssd/mpssd.c
@@ -1295,7 +1295,13 @@ reset(struct mic_info *mic)
goto retry;
mpsslog("%s: %s %d state %s\n",
mic->name, __func__, __LINE__, state);
- if ((!strcmp(state, "offline"))) {
+
+ /*
+ * If the shutdown was initiated by OSPM, the state stays
+ * in "suspended" which is also a valid condition for reset.
+ */
+ if ((!strcmp(state, "offline")) ||
+ (!strcmp(state, "suspended"))) {
free(state);
break;
}
@@ -1334,6 +1340,10 @@ static int get_mic_state(struct mic_info *mic, char *state)
return MIC_SHUTTING_DOWN;
if (!strcmp(state, "reset_failed"))
return MIC_RESET_FAILED;
+ if (!strcmp(state, "suspending"))
+ return MIC_SUSPENDING;
+ if (!strcmp(state, "suspended"))
+ return MIC_SUSPENDED;
mpsslog("%s: BUG invalid state %s\n", mic->name, state);
/* Invalid state */
assert(0);
@@ -1418,6 +1428,17 @@ retry:
case MIC_SHUTTING_DOWN:
mic_handle_shutdown(mic);
goto close_error;
+ case MIC_SUSPENDING:
+ mic->boot_on_resume = 1;
+ setsysfs(mic->name, "state", "suspend");
+ mic_handle_shutdown(mic);
+ goto close_error;
+ case MIC_OFFLINE:
+ if (mic->boot_on_resume) {
+ setsysfs(mic->name, "state", "boot");
+ mic->boot_on_resume = 0;
+ }
+ break;
default:
break;
}
@@ -1621,11 +1642,9 @@ init_mic_list(void)
while ((file = readdir(dp)) != NULL) {
if (!strncmp(file->d_name, "mic", 3)) {
- mic->next = malloc(sizeof(struct mic_info));
+ mic->next = calloc(1, sizeof(struct mic_info));
if (mic->next) {
mic = mic->next;
- mic->next = NULL;
- memset(mic, 0, sizeof(struct mic_info));
mic->id = atoi(&file->d_name[3]);
mic->name = malloc(strlen(file->d_name) + 16);
if (mic->name)
diff --git a/Documentation/mic/mpssd/mpssd.h b/Documentation/mic/mpssd/mpssd.h
index ccd589ff9146..f5f18b15d9a0 100644
--- a/Documentation/mic/mpssd/mpssd.h
+++ b/Documentation/mic/mpssd/mpssd.h
@@ -91,6 +91,7 @@ struct mic_info {
struct mic_net_info mic_net;
struct mic_virtblk_info mic_virtblk;
int restart;
+ int boot_on_resume;
struct mic_info *next;
};