ACK: [PATCH 1/2] ipmi: Remove ACPI SPMI probing from the SSIF (I2C) driver

[Kleber Souza]

On 10/22/18 21:35, Manoj Iyer wrote:
> From: Corey Minyard <cminyard at mvista.com>
>
> The IPMI spec states:
>
>   The purpose of the SPMI Table is to provide a mechanism that can
>   be used by the OSPM (an ACPI term for “OS Operating System-directed
>   configuration and Power Management” essentially meaning an ACPI-aware
>   OS or OS loader) very early in the boot process, e.g., before the
>   ability to execute ACPI control methods in the OS is available.
>
> When we are probing IPMI in Linux, ACPI control methods are available,
> so we shouldn't be probing using SPMI.  It could cause some confusion
> during the probing process.
>
> BugLink: http://launchpad.net/bugs/1799276
>
> Signed-off-by: Corey Minyard <cminyard at mvista.com>
> Tested-by: Jiandi An <anjiandi at codeaurora.org>
> (cherry picked from commit 4866b1dce0389013a268f0ab63f7229b30c6e5fe)
> Signed-off-by: Manoj Iyer <manoj.iyer at canonical.com>

Acked-by: Kleber Sacilotto de Souza <kleber.souza at canonical.com>

> ---
>  drivers/char/ipmi/ipmi_ssif.c | 105 ----------------------------------
>  1 file changed, 105 deletions(-)
>
> diff --git a/drivers/char/ipmi/ipmi_ssif.c b/drivers/char/ipmi/ipmi_ssif.c
> index 72bbf5bf8c88..6702f5a49a40 100644
> --- a/drivers/char/ipmi/ipmi_ssif.c
> +++ b/drivers/char/ipmi/ipmi_ssif.c
> @@ -1906,108 +1906,6 @@ static const struct acpi_device_id ssif_acpi_match[] = {
>  	{ },
>  };
>  MODULE_DEVICE_TABLE(acpi, ssif_acpi_match);
> -
> -/*
> - * Once we get an ACPI failure, we don't try any more, because we go
> - * through the tables sequentially.  Once we don't find a table, there
> - * are no more.
> - */
> -static int acpi_failure;
> -
> -/*
> - * Defined in the IPMI 2.0 spec.
> - */
> -struct SPMITable {
> -	s8	Signature[4];
> -	u32	Length;
> -	u8	Revision;
> -	u8	Checksum;
> -	s8	OEMID[6];
> -	s8	OEMTableID[8];
> -	s8	OEMRevision[4];
> -	s8	CreatorID[4];
> -	s8	CreatorRevision[4];
> -	u8	InterfaceType;
> -	u8	IPMIlegacy;
> -	s16	SpecificationRevision;
> -
> -	/*
> -	 * Bit 0 - SCI interrupt supported
> -	 * Bit 1 - I/O APIC/SAPIC
> -	 */
> -	u8	InterruptType;
> -
> -	/*
> -	 * If bit 0 of InterruptType is set, then this is the SCI
> -	 * interrupt in the GPEx_STS register.
> -	 */
> -	u8	GPE;
> -
> -	s16	Reserved;
> -
> -	/*
> -	 * If bit 1 of InterruptType is set, then this is the I/O
> -	 * APIC/SAPIC interrupt.
> -	 */
> -	u32	GlobalSystemInterrupt;
> -
> -	/* The actual register address. */
> -	struct acpi_generic_address addr;
> -
> -	u8	UID[4];
> -
> -	s8      spmi_id[1]; /* A '\0' terminated array starts here. */
> -};
> -
> -static int try_init_spmi(struct SPMITable *spmi)
> -{
> -	unsigned short myaddr;
> -
> -	if (num_addrs >= MAX_SSIF_BMCS)
> -		return -1;
> -
> -	if (spmi->IPMIlegacy != 1) {
> -		pr_warn("IPMI: Bad SPMI legacy: %d\n", spmi->IPMIlegacy);
> -		return -ENODEV;
> -	}
> -
> -	if (spmi->InterfaceType != 4)
> -		return -ENODEV;
> -
> -	if (spmi->addr.space_id != ACPI_ADR_SPACE_SMBUS) {
> -		pr_warn(PFX "Invalid ACPI SSIF I/O Address type: %d\n",
> -			spmi->addr.space_id);
> -		return -EIO;
> -	}
> -
> -	myaddr = spmi->addr.address & 0x7f;
> -
> -	return new_ssif_client(myaddr, NULL, 0, 0, SI_SPMI, NULL);
> -}
> -
> -static void spmi_find_bmc(void)
> -{
> -	acpi_status      status;
> -	struct SPMITable *spmi;
> -	int              i;
> -
> -	if (acpi_disabled)
> -		return;
> -
> -	if (acpi_failure)
> -		return;
> -
> -	for (i = 0; ; i++) {
> -		status = acpi_get_table(ACPI_SIG_SPMI, i+1,
> -					(struct acpi_table_header **)&spmi);
> -		if (status != AE_OK)
> -			return;
> -
> -		try_init_spmi(spmi);
> -	}
> -}
> -#else
> -static void spmi_find_bmc(void) { }
>  #endif
>  
>  #ifdef CONFIG_DMI
> @@ -2113,9 +2011,6 @@ static int init_ipmi_ssif(void)
>  		ssif_i2c_driver.driver.acpi_match_table	=
>  			ACPI_PTR(ssif_acpi_match);
>  
> -	if (ssif_tryacpi)
> -		spmi_find_bmc();
> -
>  	if (ssif_trydmi) {
>  		rv = platform_driver_register(&ipmi_driver);
>  		if (rv)