Commit d941aeae authored by Corey Minyard's avatar Corey Minyard Committed by Linus Torvalds
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ipmi: add new kernel options to prevent automatic ipmi init

The configuration change building ipmi_si into the kernel precludes the
use of a custom driver that can utilize more than one KCS interface,
multiple IPMBs, and more than one BMC.  This capability is important for
fault-tolerant systems.

Even if the kernel option ipmi_si.trydefaults=0 is specified, ipmi_si
discovers and claims one of the KCS interfaces on a Stratus server.  The
inability to now prevent the kernel from managing this device is a
regression from previous kernels.  The regression breaks a capability
fault-tolerant vendors have relied upon.

To support both ACPI opregion access and the need to avoid activation of
ipmi_si on some platforms, we've added two new kernel options,
ipmi_si.tryacpi and ipmi_si.trydmi be added to prevent ipmi_si from
initializing when these options are set to 0 on the kernel command line.
With these options at the default value of 1, ipmi_si init proceeds
according to the kernel default.
Tested-by: default avatarJim Paradis <>
Signed-off-by: default avatarRobert Evans <>
Signed-off-by: default avatarJim Paradis <>
Signed-off-by: default avatarTony Camuso <>
Signed-off-by: default avatarCorey Minyard <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 59fb1b9f
......@@ -1208,6 +1208,12 @@ static int smi_num; /* Used to sequence the SMIs */
static bool si_tryacpi = 1;
static bool si_trydmi = 1;
static bool si_trydefaults = 1;
static char *si_type[SI_MAX_PARMS];
#define MAX_SI_TYPE_STR 30
......@@ -1238,6 +1244,16 @@ MODULE_PARM_DESC(hotmod, "Add and remove interfaces. See"
" Documentation/IPMI.txt in the kernel sources for the"
" gory details.");
module_param_named(tryacpi, si_tryacpi, bool, 0);
MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
" default scan of the interfaces identified via ACPI");
module_param_named(trydmi, si_trydmi, bool, 0);
MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the"
" default scan of the interfaces identified via DMI");
module_param_named(trydefaults, si_trydefaults, bool, 0);
MODULE_PARM_DESC(trydefaults, "Setting this to 'false' will disable the"
" default scan of the KCS and SMIC interface at the standard"
......@@ -3408,16 +3424,20 @@ static int init_ipmi_si(void)
pnp_registered = 1;
if (si_tryacpi) {
pnp_registered = 1;
if (si_trydmi)
if (si_tryacpi)
/* We prefer devices with interrupts, but in the case of a machine
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