Commit 5720ab84 authored by Wang Yinfeng's avatar Wang Yinfeng Committed by Zheng Zengkai
Browse files

ipmi_si: Phytium S2500 workaround for MMIO-based IPMI 

phytium inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4RK58


CVE: NA

--------------------------------

The system would hang up when the Phytium S2500 communicates with
some BMCs after several rounds of transactions, unless we reset
the controller timeout counter manually by calling firmware through
SMC.

Signed-off-by: default avatarWang Yinfeng <wangyinfeng@phytium.com.cn>
Signed-off-by: Chen Baozi <chenbaozi@phytium.com.cn> #openEuler_contributor
Signed-off-by: default avatarLaibin Qiu <qiulaibin@huawei.com>
Reviewed-by: default avatarXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: default avatarHanjun Guo <guohanjun@huawei.com>
Acked-by: default avatarXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent dac322b1

drivers/char/ipmi/ipmi_si_mem_io.c

+76 −0
Original line number Diff line number Diff line
@@ -3,9 +3,77 @@ 
#include <linux/io.h>

#include "ipmi_si.h"



#ifdef CONFIG_ARM_GIC_PHYTIUM_2500

#include <linux/arm-smccc.h>



#define CTL_RST_FUNC_ID 0xC2000011



static bool apply_phytium2500_workaround;



struct ipmi_workaround_oem_info {

	char oem_id[ACPI_OEM_ID_SIZE + 1];

};



#ifdef CONFIG_ACPI

static struct ipmi_workaround_oem_info wa_info[] = {

	{

		.oem_id		= "KPSVVJ",

	}

};

#endif



static void ipmi_check_phytium_workaround(void)

{

#ifdef CONFIG_ACPI

	struct acpi_table_header tbl;

	int i;



	if (ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_DSDT, 0, &tbl)))

		return;



	for (i = 0; i < ARRAY_SIZE(wa_info); i++) {

		if (strncmp(wa_info[i].oem_id, tbl.oem_id, ACPI_OEM_ID_SIZE))

			continue;



		apply_phytium2500_workaround = true;

		break;

	}

#endif

}



static void ctl_smc(unsigned long arg0, unsigned long arg1,

		    unsigned long arg2, unsigned long arg3)

{

	struct arm_smccc_res res;



	arm_smccc_smc(arg0, arg1, arg2, arg3, 0, 0, 0, 0, &res);

	if (res.a0 != 0)

		pr_err("Error: Firmware call SMC reset Failed: %d, addr: 0x%lx\n",

			(int)res.a0, arg2);

}



static void ctl_timeout_reset(void)

{

	ctl_smc(CTL_RST_FUNC_ID, 0x1, 0x28100208, 0x1);

	ctl_smc(CTL_RST_FUNC_ID, 0x1, 0x2810020C, 0x1);

}



static inline void ipmi_phytium_workaround(void)

{

	if (apply_phytium2500_workaround)

		ctl_timeout_reset();

}



#else

static inline void ipmi_check_phytium_workaround(void) {}

static inline void ipmi_phytium_workaround(void) {}

#endif



static unsigned char intf_mem_inb(const struct si_sm_io *io,

				  unsigned int offset)

{

	ipmi_phytium_workaround();



	return readb((io->addr)+(offset * io->regspacing));

}
@@ -18,6 +86,8 @@ static void intf_mem_outb(const struct si_sm_io *io, unsigned int offset, 
static unsigned char intf_mem_inw(const struct si_sm_io *io,

				  unsigned int offset)

{

	ipmi_phytium_workaround();



	return (readw((io->addr)+(offset * io->regspacing)) >> io->regshift)

		& 0xff;

}
@@ -31,6 +101,8 @@ static void intf_mem_outw(const struct si_sm_io *io, unsigned int offset, 
static unsigned char intf_mem_inl(const struct si_sm_io *io,

				  unsigned int offset)

{

	ipmi_phytium_workaround();



	return (readl((io->addr)+(offset * io->regspacing)) >> io->regshift)

		& 0xff;

}
@@ -44,6 +116,8 @@ static void intf_mem_outl(const struct si_sm_io *io, unsigned int offset, 
#ifdef readq

static unsigned char mem_inq(const struct si_sm_io *io, unsigned int offset)

{

	ipmi_phytium_workaround();



	return (readq((io->addr)+(offset * io->regspacing)) >> io->regshift)

		& 0xff;

}
@@ -81,6 +155,8 @@ int ipmi_si_mem_setup(struct si_sm_io *io) 
	if (!addr)

		return -ENODEV;



	ipmi_check_phytium_workaround();



	/*

	 * Figure out the actual readb/readw/readl/etc routine to use based

	 * upon the register size.