ipmi: remove trydefaults parameter and default init

Parameter trydefaults=1 causes the ipmi_init to initialize ipmi through
the legacy port io space that was designated for ipmi. Architectures
that do not map legacy port io can panic when trydefaults=1.

Rather than implement build-time conditional exceptions for each
architecture that does not map legacy port io, we have removed legacy
port io from the driver.

Parameter 'trydefaults' has been removed. Attempts to use it hereafter
will evoke the "Unknown symbol in module, or unknown parameter" message.

The patch was built against a number of architectures and tested for
regressions and functionality on x86_64 and ARM64.
Signed-off-by: Tony Camuso <tcamuso@redhat.com>

Removed the config entry and the address source entry for default,
since neither were used any more.
Signed-off-by: Corey Minyard <cminyard@mvista.com>

drivers/char/ipmi/Kconfig

@@ -50,18 +50,6 @@ config IPMI_SI
 	 Currently, only KCS and SMIC are supported.  If
 	 you are using IPMI, you should probably say "y" here.
 
-config IPMI_SI_PROBE_DEFAULTS
-       bool 'Probe for all possible IPMI system interfaces by default'
-       default n
-       depends on IPMI_SI
-       help
-	 Modern systems will usually expose IPMI interfaces via a discoverable
-	 firmware mechanism such as ACPI or DMI. Older systems do not, and so
-	 the driver is forced to probe hardware manually. This may cause boot
-	 delays. Say "n" here to disable this manual probing. IPMI will then
-	 only be available on older systems if the "ipmi_si_intf.trydefaults=1"
-	 boot argument is passed.
-
 config IPMI_SSIF
        tristate 'IPMI SMBus handler (SSIF)'
        select I2C

drivers/char/ipmi/ipmi_msghandler.c

@@ -474,12 +474,12 @@ static DEFINE_MUTEX(smi_watchers_mutex);
 
 static const char * const addr_src_to_str[] = {
 	"invalid", "hotmod", "hardcoded", "SPMI", "ACPI", "SMBIOS", "PCI",
-	"device-tree", "default"
+	"device-tree"
 };
 
 const char *ipmi_addr_src_to_str(enum ipmi_addr_src src)
 {
-	if (src > SI_DEFAULT)
+	if (src >= SI_LAST)
 		src = 0; /* Invalid */
 	return addr_src_to_str[src];
 }

drivers/char/ipmi/ipmi_si_intf.c

@@ -1322,7 +1322,6 @@ static bool          si_tryplatform = true;
 #ifdef CONFIG_PCI
 static bool          si_trypci = true;
 #endif
-static bool          si_trydefaults = IS_ENABLED(CONFIG_IPMI_SI_PROBE_DEFAULTS);
 static char          *si_type[SI_MAX_PARMS];
 #define MAX_SI_TYPE_STR 30
 static char          si_type_str[MAX_SI_TYPE_STR];
@@ -1371,10 +1370,6 @@ module_param_named(trypci, si_trypci, bool, 0);
 MODULE_PARM_DESC(trypci, "Setting this to zero will disable the"
 		 " default scan of the interfaces identified via pci");
 #endif
-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"
-		 " address");
 module_param_string(type, si_type_str, MAX_SI_TYPE_STR, 0);
 MODULE_PARM_DESC(type, "Defines the type of each interface, each"
 		 " interface separated by commas.  The types are 'kcs',"
@@ -3461,62 +3456,6 @@ static inline void wait_for_timer_and_thread(struct smi_info *smi_info)
 		del_timer_sync(&smi_info->si_timer);
 }
 
-static const struct ipmi_default_vals
-{
-	const int type;
-	const int port;
-} ipmi_defaults[] =
-{
-	{ .type = SI_KCS, .port = 0xca2 },
-	{ .type = SI_SMIC, .port = 0xca9 },
-	{ .type = SI_BT, .port = 0xe4 },
-	{ .port = 0 }
-};
-
-static void default_find_bmc(void)
-{
-	struct smi_info *info;
-	int             i;
-
-	for (i = 0; ; i++) {
-		if (!ipmi_defaults[i].port)
-			break;
-#ifdef CONFIG_PPC
-		if (check_legacy_ioport(ipmi_defaults[i].port))
-			continue;
-#endif
-		info = smi_info_alloc();
-		if (!info)
-			return;
-
-		info->addr_source = SI_DEFAULT;
-
-		info->si_type = ipmi_defaults[i].type;
-		info->io_setup = port_setup;
-		info->io.addr_data = ipmi_defaults[i].port;
-		info->io.addr_type = IPMI_IO_ADDR_SPACE;
-
-		info->io.addr = NULL;
-		info->io.regspacing = DEFAULT_REGSPACING;
-		info->io.regsize = DEFAULT_REGSPACING;
-		info->io.regshift = 0;
-
-		if (add_smi(info) == 0) {
-			if ((try_smi_init(info)) == 0) {
-				/* Found one... */
-				printk(KERN_INFO PFX "Found default %s"
-				" state machine at %s address 0x%lx\n",
-				si_to_str[info->si_type],
-				addr_space_to_str[info->io.addr_type],
-				info->io.addr_data);
-			} else
-				cleanup_one_si(info);
-		} else {
-			kfree(info);
-		}
-	}
-}
-
 static int is_new_interface(struct smi_info *info)
 {
 	struct smi_info *e;
@@ -3844,8 +3783,6 @@ static int init_ipmi_si(void)
 #ifdef CONFIG_PARISC
 	register_parisc_driver(&ipmi_parisc_driver);
 	parisc_registered = true;
-	/* poking PC IO addresses will crash machine, don't do it */
-	si_trydefaults = 0;
 #endif
 
 	/* We prefer devices with interrupts, but in the case of a machine
@@ -3885,16 +3822,6 @@ static int init_ipmi_si(void)
 	if (type)
 		return 0;
 
-	if (si_trydefaults) {
-		mutex_lock(&smi_infos_lock);
-		if (list_empty(&smi_infos)) {
-			/* No BMC was found, try defaults. */
-			mutex_unlock(&smi_infos_lock);
-			default_find_bmc();
-		} else
-			mutex_unlock(&smi_infos_lock);
-	}
-
 	mutex_lock(&smi_infos_lock);
 	if (unload_when_empty && list_empty(&smi_infos)) {
 		mutex_unlock(&smi_infos_lock);

include/linux/ipmi.h

@@ -277,7 +277,7 @@ int ipmi_validate_addr(struct ipmi_addr *addr, int len);
  */
 enum ipmi_addr_src {
 	SI_INVALID = 0, SI_HOTMOD, SI_HARDCODED, SI_SPMI, SI_ACPI, SI_SMBIOS,
-	SI_PCI,	SI_DEVICETREE, SI_DEFAULT
+	SI_PCI,	SI_DEVICETREE, SI_LAST
 };
 const char *ipmi_addr_src_to_str(enum ipmi_addr_src src);