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ipmi: Check the BT interrupt enable periodically

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On a reset, the BMC may reset the BT enable in the processor
registers (different than the global enables in the BMC).  Check
it periodically and fix it if necessary.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Tested-by: Tony Rex <tony.rex@ericsson.com>
Tested-by: Magnus Johansson E <magnus.e.johansson@ericsson.com>
This commit is contained in:
Corey Minyard 2014-11-20 07:19:44 -06:00
parent a8df150c5d
commit 95c97b5941
1 changed files with 25 additions and 2 deletions
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27
drivers/char/ipmi/ipmi_si_intf.c
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@ -536,7 +536,8 @@ static void handle_flags(struct smi_info *smi_info)
#define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \
IPMI_BMC_EVT_MSG_INTR)
static u8 current_global_enables(struct smi_info *smi_info, u8 base)
static u8 current_global_enables(struct smi_info *smi_info, u8 base,
bool *irq_on)
{
u8 enables = 0;
@ -557,9 +558,27 @@ static u8 current_global_enables(struct smi_info *smi_info, u8 base)
else
enables &= ~IPMI_BMC_EVT_MSG_INTR;
*irq_on = enables & (IPMI_BMC_EVT_MSG_INTR | IPMI_BMC_RCV_MSG_INTR);
return enables;
}
static void check_bt_irq(struct smi_info *smi_info, bool irq_on)
{
u8 irqstate = smi_info->io.inputb(&smi_info->io, IPMI_BT_INTMASK_REG);
irqstate &= IPMI_BT_INTMASK_ENABLE_IRQ_BIT;
if ((bool)irqstate == irq_on)
return;
if (irq_on)
smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG,
IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
else
smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, 0);
}
static void handle_transaction_done(struct smi_info *smi_info)
{
struct ipmi_smi_msg *msg;
@ -708,6 +727,7 @@ static void handle_transaction_done(struct smi_info *smi_info)
{
unsigned char msg[4];
u8 enables;
bool irq_on;
/* We got the flags from the SMI, now handle them. */
smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
@ -719,7 +739,10 @@ static void handle_transaction_done(struct smi_info *smi_info)
smi_info->si_state = SI_NORMAL;
break;
}
enables = current_global_enables(smi_info, 0);
enables = current_global_enables(smi_info, 0, &irq_on);
if (smi_info->si_type == SI_BT)
/* BT has its own interrupt enable bit. */
check_bt_irq(smi_info, irq_on);
if (enables != (msg[3] & GLOBAL_ENABLES_MASK)) {
/* Enables are not correct, fix them. */
msg[0] = (IPMI_NETFN_APP_REQUEST << 2);