linux-kernel - Re: [PATCH 1/1] ipmi: remove trydefaults parameter and default init

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Date:	Mon, 27 Jun 2016 20:34:04 -0500
From:	Corey Minyard <minyard@....org>
To:	Tony Camuso <tcamuso@...hat.com>,
	openipmi-developer@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ipmi: remove trydefaults parameter and default init

Queued for 2.18, if that is ok.

Thanks,

-corey

On 06/22/2016 01:22 PM, Tony Camuso wrote:
> 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@...hat.com>
> ---
>   drivers/char/ipmi/ipmi_si_intf.c | 73 ----------------------------------------
>   1 file changed, 73 deletions(-)
>
> diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
> index 7b1c412..a112c01 100644
> --- a/drivers/char/ipmi/ipmi_si_intf.c
> +++ b/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);