diff options
| author | Gavin Shan <shangw@linux.vnet.ibm.com> | 2012-02-27 20:03:58 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-03-09 11:10:39 +1100 |
| commit | b0e5f742f1816bebedabeb6844be1a598bd50a91 (patch) | |
| tree | 16872bc2b9a96f45ea3d409b72b42bf31d5b28a8 /arch/powerpc/platforms/pseries/eeh_pseries.c | |
| parent | eb594a4754e71e41c048e0f1559bb6f13dab7070 (diff) | |
powerpc/eeh: pseries platform EEH wait PE state
On pSeries platform, the PE state might be temporarily unavailable.
In that case, the firmware will return the corresponding wait time.
That means the kernel has to wait for appropriate time in order to
get the PE state.
The patch does the implementation for that. Besides, the function
has been abstracted through struct eeh_ops::wait_state so that EEH core
components could support multiple platforms in future.
Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms/pseries/eeh_pseries.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/eeh_pseries.c | 47 |
1 files changed, 46 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/pseries/eeh_pseries.c b/arch/powerpc/platforms/pseries/eeh_pseries.c index 39567b262dea..7b60131efe95 100644 --- a/arch/powerpc/platforms/pseries/eeh_pseries.c +++ b/arch/powerpc/platforms/pseries/eeh_pseries.c @@ -331,7 +331,52 @@ static int pseries_eeh_reset(struct device_node *dn, int option) */ static int pseries_eeh_wait_state(struct device_node *dn, int max_wait) { - return 0; + int ret; + int mwait; + + /* + * According to PAPR, the state of PE might be temporarily + * unavailable. Under the circumstance, we have to wait + * for indicated time determined by firmware. The maximal + * wait time is 5 minutes, which is acquired from the original + * EEH implementation. Also, the original implementation + * also defined the minimal wait time as 1 second. + */ +#define EEH_STATE_MIN_WAIT_TIME (1000) +#define EEH_STATE_MAX_WAIT_TIME (300 * 1000) + + while (1) { + ret = pseries_eeh_get_state(dn, &mwait); + + /* + * If the PE's state is temporarily unavailable, + * we have to wait for the specified time. Otherwise, + * the PE's state will be returned immediately. + */ + if (ret != EEH_STATE_UNAVAILABLE) + return ret; + + if (max_wait <= 0) { + pr_warning("%s: Timeout when getting PE's state (%d)\n", + __func__, max_wait); + return EEH_STATE_NOT_SUPPORT; + } + + if (mwait <= 0) { + pr_warning("%s: Firmware returned bad wait value %d\n", + __func__, mwait); + mwait = EEH_STATE_MIN_WAIT_TIME; + } else if (mwait > EEH_STATE_MAX_WAIT_TIME) { + pr_warning("%s: Firmware returned too long wait value %d\n", + __func__, mwait); + mwait = EEH_STATE_MAX_WAIT_TIME; + } + + max_wait -= mwait; + msleep(mwait); + } + + return EEH_STATE_NOT_SUPPORT; } /** |