diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c index 2f4cf6e78f72..21bddc10e321 100644 --- a/drivers/char/ipmi/ipmi_si_intf.c +++ b/drivers/char/ipmi/ipmi_si_intf.c @@ -262,9 +262,21 @@ struct smi_info { bool supports_event_msg_buff; /* - * Can we clear the global enables receive irq bit? + * Can we disable interrupts the global enables receive irq + * bit? There are currently two forms of brokenness, some + * systems cannot disable the bit (which is technically within + * the spec but a bad idea) and some systems have the bit + * forced to zero even though interrupts work (which is + * clearly outside the spec). The next bool tells which form + * of brokenness is present. */ - bool cannot_clear_recv_irq_bit; + bool cannot_disable_irq; + + /* + * Some systems are broken and cannot set the irq enable + * bit, even if they support interrupts. + */ + bool irq_enable_broken; /* * Did we get an attention that we did not handle? @@ -554,13 +566,14 @@ static u8 current_global_enables(struct smi_info *smi_info, u8 base, if (smi_info->supports_event_msg_buff) enables |= IPMI_BMC_EVT_MSG_BUFF; - if ((smi_info->irq && !smi_info->interrupt_disabled) || - smi_info->cannot_clear_recv_irq_bit) + if (((smi_info->irq && !smi_info->interrupt_disabled) || + smi_info->cannot_disable_irq) && + !smi_info->irq_enable_broken) enables |= IPMI_BMC_RCV_MSG_INTR; if (smi_info->supports_event_msg_buff && - smi_info->irq && !smi_info->interrupt_disabled) - + smi_info->irq && !smi_info->interrupt_disabled && + !smi_info->irq_enable_broken) enables |= IPMI_BMC_EVT_MSG_INTR; *irq_on = enables & (IPMI_BMC_EVT_MSG_INTR | IPMI_BMC_RCV_MSG_INTR); @@ -2908,12 +2921,7 @@ static int try_get_dev_id(struct smi_info *smi_info) return rv; } -/* - * Some BMCs do not support clearing the receive irq bit in the global - * enables (even if they don't support interrupts on the BMC). Check - * for this and handle it properly. - */ -static void check_clr_rcv_irq(struct smi_info *smi_info) +static int get_global_enables(struct smi_info *smi_info, u8 *enables) { unsigned char msg[3]; unsigned char *resp; @@ -2921,12 +2929,8 @@ static void check_clr_rcv_irq(struct smi_info *smi_info) int rv; resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); - if (!resp) { - printk(KERN_WARNING PFX "Out of memory allocating response for" - " global enables command, cannot check recv irq bit" - " handling.\n"); - return; - } + if (!resp) + return -ENOMEM; msg[0] = IPMI_NETFN_APP_REQUEST << 2; msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; @@ -2934,9 +2938,9 @@ static void check_clr_rcv_irq(struct smi_info *smi_info) rv = wait_for_msg_done(smi_info); if (rv) { - printk(KERN_WARNING PFX "Error getting response from get" - " global enables command, cannot check recv irq bit" - " handling.\n"); + dev_warn(smi_info->dev, + "Error getting response from get global enables command: %d\n", + rv); goto out; } @@ -2947,27 +2951,44 @@ static void check_clr_rcv_irq(struct smi_info *smi_info) resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD || resp[2] != 0) { - printk(KERN_WARNING PFX "Invalid return from get global" - " enables command, cannot check recv irq bit" - " handling.\n"); + dev_warn(smi_info->dev, + "Invalid return from get global enables command: %ld %x %x %x\n", + resp_len, resp[0], resp[1], resp[2]); rv = -EINVAL; goto out; + } else { + *enables = resp[3]; } - if ((resp[3] & IPMI_BMC_RCV_MSG_INTR) == 0) - /* Already clear, should work ok. */ - goto out; +out: + kfree(resp); + return rv; +} + +/* + * Returns 1 if it gets an error from the command. + */ +static int set_global_enables(struct smi_info *smi_info, u8 enables) +{ + unsigned char msg[3]; + unsigned char *resp; + unsigned long resp_len; + int rv; + + resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); + if (!resp) + return -ENOMEM; msg[0] = IPMI_NETFN_APP_REQUEST << 2; msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; - msg[2] = resp[3] & ~IPMI_BMC_RCV_MSG_INTR; + msg[2] = enables; smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); rv = wait_for_msg_done(smi_info); if (rv) { - printk(KERN_WARNING PFX "Error getting response from set" - " global enables command, cannot check recv irq bit" - " handling.\n"); + dev_warn(smi_info->dev, + "Error getting response from set global enables command: %d\n", + rv); goto out; } @@ -2977,25 +2998,93 @@ static void check_clr_rcv_irq(struct smi_info *smi_info) if (resp_len < 3 || resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) { - printk(KERN_WARNING PFX "Invalid return from get global" - " enables command, cannot check recv irq bit" - " handling.\n"); + dev_warn(smi_info->dev, + "Invalid return from set global enables command: %ld %x %x\n", + resp_len, resp[0], resp[1]); rv = -EINVAL; goto out; } - if (resp[2] != 0) { + if (resp[2] != 0) + rv = 1; + +out: + kfree(resp); + return rv; +} + +/* + * Some BMCs do not support clearing the receive irq bit in the global + * enables (even if they don't support interrupts on the BMC). Check + * for this and handle it properly. + */ +static void check_clr_rcv_irq(struct smi_info *smi_info) +{ + u8 enables = 0; + int rv; + + rv = get_global_enables(smi_info, &enables); + if (!rv) { + if ((enables & IPMI_BMC_RCV_MSG_INTR) == 0) + /* Already clear, should work ok. */ + return; + + enables &= ~IPMI_BMC_RCV_MSG_INTR; + rv = set_global_enables(smi_info, enables); + } + + if (rv < 0) { + dev_err(smi_info->dev, + "Cannot check clearing the rcv irq: %d\n", rv); + return; + } + + if (rv) { /* * An error when setting the event buffer bit means * clearing the bit is not supported. */ - printk(KERN_WARNING PFX "The BMC does not support clearing" - " the recv irq bit, compensating, but the BMC needs to" - " be fixed.\n"); - smi_info->cannot_clear_recv_irq_bit = true; + dev_warn(smi_info->dev, + "The BMC does not support clearing the recv irq bit, compensating, but the BMC needs to be fixed.\n"); + smi_info->cannot_disable_irq = true; + } +} + +/* + * Some BMCs do not support setting the interrupt bits in the global + * enables even if they support interrupts. Clearly bad, but we can + * compensate. + */ +static void check_set_rcv_irq(struct smi_info *smi_info) +{ + u8 enables = 0; + int rv; + + if (!smi_info->irq) + return; + + rv = get_global_enables(smi_info, &enables); + if (!rv) { + enables |= IPMI_BMC_RCV_MSG_INTR; + rv = set_global_enables(smi_info, enables); + } + + if (rv < 0) { + dev_err(smi_info->dev, + "Cannot check setting the rcv irq: %d\n", rv); + return; + } + + if (rv) { + /* + * An error when setting the event buffer bit means + * setting the bit is not supported. + */ + dev_warn(smi_info->dev, + "The BMC does not support setting the recv irq bit, compensating, but the BMC needs to be fixed.\n"); + smi_info->cannot_disable_irq = true; + smi_info->irq_enable_broken = true; } - out: - kfree(resp); } static int try_enable_event_buffer(struct smi_info *smi_info) @@ -3316,6 +3405,12 @@ static void setup_xaction_handlers(struct smi_info *smi_info) setup_dell_poweredge_bt_xaction_handler(smi_info); } +static void check_for_broken_irqs(struct smi_info *smi_info) +{ + check_clr_rcv_irq(smi_info); + check_set_rcv_irq(smi_info); +} + static inline void wait_for_timer_and_thread(struct smi_info *smi_info) { if (smi_info->thread != NULL) @@ -3493,10 +3588,9 @@ static int try_smi_init(struct smi_info *new_smi) goto out_err; } - check_clr_rcv_irq(new_smi); - setup_oem_data_handler(new_smi); setup_xaction_handlers(new_smi); + check_for_broken_irqs(new_smi); new_smi->waiting_msg = NULL; new_smi->curr_msg = NULL;