ipmi: Create a platform device for a DMI-specified IPMI interface (9f88145f) · Commits · 戴 / test

drivers/char/ipmi/Kconfig

+4 −0

Original line number	Diff line number	Diff line
		@@ -5,6 +5,7 @@
		menuconfig IPMI_HANDLER
		tristate 'IPMI top-level message handler'
		depends on HAS_IOMEM
		select IPMI_DMI_DECODE if DMI
		help
		This enables the central IPMI message handler, required for IPMI
		to work.
		@@ -16,6 +17,9 @@ menuconfig IPMI_HANDLER

		If unsure, say N.

		config IPMI_DMI_DECODE
		bool

		if IPMI_HANDLER

		config IPMI_PANIC_EVENT

drivers/char/ipmi/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -7,6 +7,7 @@ ipmi_si-y := ipmi_si_intf.o ipmi_kcs_sm.o ipmi_smic_sm.o ipmi_bt_sm.o
		obj-$(CONFIG_IPMI_HANDLER) += ipmi_msghandler.o
		obj-$(CONFIG_IPMI_DEVICE_INTERFACE) += ipmi_devintf.o
		obj-$(CONFIG_IPMI_SI) += ipmi_si.o
		obj-$(CONFIG_IPMI_DMI_DECODE) += ipmi_dmi.o
		obj-$(CONFIG_IPMI_SSIF) += ipmi_ssif.o
		obj-$(CONFIG_IPMI_POWERNV) += ipmi_powernv.o
		obj-$(CONFIG_IPMI_WATCHDOG) += ipmi_watchdog.o

drivers/char/ipmi/ipmi_dmi.c

0 → 100644

+273 −0

Original line number	Diff line number	Diff line
		/*
		* A hack to create a platform device from a DMI entry. This will
		* allow autoloading of the IPMI drive based on SMBIOS entries.
		*/

		#include <linux/ipmi.h>
		#include <linux/init.h>
		#include <linux/dmi.h>
		#include <linux/platform_device.h>
		#include <linux/property.h>
		#include "ipmi_dmi.h"

		struct ipmi_dmi_info {
		int type;
		u32 flags;
		unsigned long addr;
		u8 slave_addr;
		struct ipmi_dmi_info *next;
		};

		static struct ipmi_dmi_info *ipmi_dmi_infos;

		static int ipmi_dmi_nr __initdata;

		static void __init dmi_add_platform_ipmi(unsigned long base_addr,
		u32 flags,
		u8 slave_addr,
		int irq,
		int offset,
		int type)
		{
		struct platform_device *pdev;
		struct resource r[4];
		unsigned int num_r = 1, size;
		struct property_entry p[4] = {
		PROPERTY_ENTRY_U8("slave-addr", slave_addr),
		PROPERTY_ENTRY_U8("ipmi-type", type),
		PROPERTY_ENTRY_U16("i2c-addr", base_addr),
		{ }
		};
		char name, override;
		int rv;
		struct ipmi_dmi_info *info;

		info = kmalloc(sizeof(*info), GFP_KERNEL);
		if (!info) {
		pr_warn("ipmi:dmi: Could not allocate dmi info\n");
		} else {
		info->type = type;
		info->flags = flags;
		info->addr = base_addr;
		info->slave_addr = slave_addr;
		info->next = ipmi_dmi_infos;
		ipmi_dmi_infos = info;
		}

		name = "dmi-ipmi-si";
		override = "ipmi_si";
		switch (type) {
		case IPMI_DMI_TYPE_SSIF:
		name = "dmi-ipmi-ssif";
		override = "ipmi_ssif";
		offset = 1;
		size = 1;
		break;
		case IPMI_DMI_TYPE_BT:
		size = 3;
		break;
		case IPMI_DMI_TYPE_KCS:
		case IPMI_DMI_TYPE_SMIC:
		size = 2;
		break;
		default:
		pr_err("ipmi:dmi: Invalid IPMI type: %d", type);
		return;
		}

		pdev = platform_device_alloc(name, ipmi_dmi_nr);
		if (!pdev) {
		pr_err("ipmi:dmi: Error allocation IPMI platform device");
		return;
		}
		pdev->driver_override = override;

		if (type == IPMI_DMI_TYPE_SSIF)
		goto add_properties;

		memset(r, 0, sizeof(r));

		r[0].start = base_addr;
		r[0].end = r[0].start + offset - 1;
		r[0].name = "IPMI Address 1";
		r[0].flags = flags;

		if (size > 1) {
		r[1].start = r[0].start + offset;
		r[1].end = r[1].start + offset - 1;
		r[1].name = "IPMI Address 2";
		r[1].flags = flags;
		num_r++;
		}

		if (size > 2) {
		r[2].start = r[1].start + offset;
		r[2].end = r[2].start + offset - 1;
		r[2].name = "IPMI Address 3";
		r[2].flags = flags;
		num_r++;
		}

		if (irq) {
		r[num_r].start = irq;
		r[num_r].end = irq;
		r[num_r].name = "IPMI IRQ";
		r[num_r].flags = IORESOURCE_IRQ;
		num_r++;
		}

		rv = platform_device_add_resources(pdev, r, num_r);
		if (rv) {
		dev_err(&pdev->dev,
		"ipmi:dmi: Unable to add resources: %d\n", rv);
		goto err;
		}

		add_properties:
		rv = platform_device_add_properties(pdev, p);
		if (rv) {
		dev_err(&pdev->dev,
		"ipmi:dmi: Unable to add properties: %d\n", rv);
		goto err;
		}

		rv = platform_device_add(pdev);
		if (rv) {
		dev_err(&pdev->dev, "ipmi:dmi: Unable to add device: %d\n", rv);
		goto err;
		}

		ipmi_dmi_nr++;
		return;

		err:
		platform_device_put(pdev);
		}

		/*
		* Look up the slave address for a given interface. This is here
		* because ACPI doesn't have a slave address while SMBIOS does, but we
		* prefer using ACPI so the ACPI code can use the IPMI namespace.
		* This function allows an ACPI-specified IPMI device to look up the
		* slave address from the DMI table.
		*/
		int ipmi_dmi_get_slave_addr(int type, u32 flags, unsigned long base_addr)
		{
		struct ipmi_dmi_info *info = ipmi_dmi_infos;

		while (info) {
		if (info->type == type &&
		info->flags == flags &&
		info->addr == base_addr)
		return info->slave_addr;
		info = info->next;
		}

		return 0;
		}
		EXPORT_SYMBOL(ipmi_dmi_get_slave_addr);

		#define DMI_IPMI_MIN_LENGTH 0x10
		#define DMI_IPMI_VER2_LENGTH 0x12
		#define DMI_IPMI_TYPE 4
		#define DMI_IPMI_SLAVEADDR 6
		#define DMI_IPMI_ADDR 8
		#define DMI_IPMI_ACCESS 0x10
		#define DMI_IPMI_IRQ 0x11
		#define DMI_IPMI_IO_MASK 0xfffe

		static void __init dmi_decode_ipmi(const struct dmi_header *dm)
		{
		const u8 data = (const u8 ) dm;
		u32 flags = IORESOURCE_IO;
		unsigned long base_addr;
		u8 len = dm->length;
		u8 slave_addr;
		int irq = 0, offset;
		int type;

		if (len < DMI_IPMI_MIN_LENGTH)
		return;

		type = data[DMI_IPMI_TYPE];
		slave_addr = data[DMI_IPMI_SLAVEADDR];

		memcpy(&base_addr, data + DMI_IPMI_ADDR, sizeof(unsigned long));
		if (len >= DMI_IPMI_VER2_LENGTH) {
		if (type == IPMI_DMI_TYPE_SSIF) {
		offset = 0;
		flags = 0;
		base_addr = data[DMI_IPMI_ADDR] >> 1;
		if (base_addr == 0) {
		/*
		* Some broken systems put the I2C address in
		* the slave address field. We try to
		* accommodate them here.
		*/
		base_addr = data[DMI_IPMI_SLAVEADDR] >> 1;
		slave_addr = 0;
		}
		} else {
		if (base_addr & 1) {
		/* I/O */
		base_addr &= DMI_IPMI_IO_MASK;
		} else {
		/* Memory */
		flags = IORESOURCE_MEM;
		}

		/*
		* If bit 4 of byte 0x10 is set, then the lsb
		* for the address is odd.
		*/
		base_addr \|= (data[DMI_IPMI_ACCESS] >> 4) & 1;

		irq = data[DMI_IPMI_IRQ];

		/*
		* The top two bits of byte 0x10 hold the
		* register spacing.
		*/
		switch ((data[DMI_IPMI_ACCESS] >> 6) & 3) {
		case 0: /* Byte boundaries */
		offset = 1;
		break;
		case 1: /* 32-bit boundaries */
		offset = 4;
		break;
		case 2: /* 16-byte boundaries */
		offset = 16;
		break;
		default:
		pr_err("ipmi:dmi: Invalid offset: 0");
		return;
		}
		}
		} else {
		/* Old DMI spec. */
		/*
		* Note that technically, the lower bit of the base
		* address should be 1 if the address is I/O and 0 if
		* the address is in memory. So many systems get that
		* wrong (and all that I have seen are I/O) so we just
		* ignore that bit and assume I/O. Systems that use
		* memory should use the newer spec, anyway.
		*/
		base_addr = base_addr & DMI_IPMI_IO_MASK;
		offset = 1;
		}

		dmi_add_platform_ipmi(base_addr, flags, slave_addr, irq,
		offset, type);
		}

		static int __init scan_for_dmi_ipmi(void)
		{
		const struct dmi_device *dev = NULL;

		while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev)))
		dmi_decode_ipmi((const struct dmi_header *) dev->device_data);

		return 0;
		}
		subsys_initcall(scan_for_dmi_ipmi);

drivers/char/ipmi/ipmi_dmi.h

0 → 100644

+12 −0

Original line number	Diff line number	Diff line
		/*
		* DMI defines for use by IPMI
		*/

		#define IPMI_DMI_TYPE_KCS 0x01
		#define IPMI_DMI_TYPE_SMIC 0x02
		#define IPMI_DMI_TYPE_BT 0x03
		#define IPMI_DMI_TYPE_SSIF 0x04

		#ifdef CONFIG_IPMI_DMI_DECODE
		int ipmi_dmi_get_slave_addr(int type, u32 flags, unsigned long base_addr);
		#endif

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