[PATCH v3 0/5] dmi: Rework to get IPMI autoloading from DMI tables

[PATCH v3 0/5] dmi: Rework to get IPMI autoloading from DMI tables

[minyard]

This is unchanged from v2, just rebased onto a more current kernel.

I haven't heard anything about this.  If we could get this functionality
in to the 4.7 kernel, that would be really helpful.

The only think I really don't like about this is using driver_override,
but otherwise a bunch of infrastructure would have to be added, and
that's probably not wise.  So I'm happy with this set.

-corey

[PATCH v3 1/5] dmi: remove const from return of dmi_find_device

[minyard]

From: Corey Minyard <cminyard@mvista.com>

A fwnode_handle is being added to dmi_device, and that will need to
be updated.  So remove the const.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: Jean Delvare <jdelvare@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Tested-by: Andy Lutomirski <luto@kernel.org>
---
 drivers/firmware/dmi_scan.c | 11 +++++------
 include/linux/dmi.h         | 10 +++++-----
 2 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 88bebe1..da471b2 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -896,14 +896,13 @@ EXPORT_SYMBOL(dmi_name_in_vendors);
  *	A new search is initiated by passing %NULL as the @from argument.
  *	If @from is not %NULL, searches continue from next device.
  */
-const struct dmi_device *dmi_find_device(int type, const char *name,
-				    const struct dmi_device *from)
+struct dmi_device *dmi_find_device(int type, const char *name,
+				   const struct dmi_device *from)
 {
-	const struct list_head *head = from ? &from->list : &dmi_devices;
-	struct list_head *d;
+	struct list_head *d = from ? from->list.next : dmi_devices.next;
 
-	for (d = head->next; d != &dmi_devices; d = d->next) {
-		const struct dmi_device *dev =
+	for (; d != &dmi_devices; d = d->next) {
+		struct dmi_device *dev =
 			list_entry(d, struct dmi_device, list);
 
 		if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
diff --git a/include/linux/dmi.h b/include/linux/dmi.h
index 5e9c74c..a930a4d 100644
--- a/include/linux/dmi.h
+++ b/include/linux/dmi.h
@@ -98,9 +98,9 @@ struct dmi_dev_onboard {
 extern struct kobject *dmi_kobj;
 extern int dmi_check_system(const struct dmi_system_id *list);
 const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list);
-extern const char * dmi_get_system_info(int field);
-extern const struct dmi_device * dmi_find_device(int type, const char *name,
-	const struct dmi_device *from);
+extern const char *dmi_get_system_info(int field);
+extern struct dmi_device *dmi_find_device(int type, const char *name,
+	 const struct dmi_device *from);
 extern void dmi_scan_machine(void);
 extern void dmi_memdev_walk(void);
 extern void dmi_set_dump_stack_arch_desc(void);
@@ -116,8 +116,8 @@ extern void dmi_memdev_name(u16 handle, const char **bank, const char **device);
 #else
 
 static inline int dmi_check_system(const struct dmi_system_id *list) { return 0; }
-static inline const char * dmi_get_system_info(int field) { return NULL; }
-static inline const struct dmi_device * dmi_find_device(int type, const char *name,
+static inline const char *dmi_get_system_info(int field) { return NULL; }
+static inline struct dmi_device *dmi_find_device(int type, const char *name,
 	const struct dmi_device *from) { return NULL; }
 static inline void dmi_scan_machine(void) { return; }
 static inline void dmi_memdev_walk(void) { }
-- 
2.7.4

Re: [PATCH v3 1/5] dmi: remove const from return of dmi_find_device

[Andy Lutomirski]

On Wed, Apr 27, 2016 at 6:04 AM,  <minyard@acm.org> wrote:
> From: Corey Minyard <cminyard@mvista.com>
>
> A fwnode_handle is being added to dmi_device, and that will need to
> be updated.  So remove the const.

Did this series ever land in a subsystem tree?

--Andy

Re: [Openipmi-developer] [PATCH v3 1/5] dmi: remove const from return of dmi_find_device

[Corey Minyard]

On 05/17/2016 11:44 AM, Andy Lutomirski wrote:
> On Wed, Apr 27, 2016 at 6:04 AM,  <minyard@acm.org> wrote:
>> From: Corey Minyard <cminyard@mvista.com>
>>
>> A fwnode_handle is being added to dmi_device, and that will need to
>> be updated.  So remove the const.
> Did this series ever land in a subsystem tree?

No, I have received no acks on it.  I'd like to get it in 4.7.

-corey

> --Andy
>
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[PATCH v3 2/5] dmi: Add a DMI firmware node and handling

[minyard]

From: Corey Minyard <cminyard@mvista.com>

This is so that an IPMI platform device can be created from a
DMI firmware entry.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: Jean Delvare <jdelvare@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Tested-by: Andy Lutomirski <luto@kernel.org>
---
 drivers/firmware/dmi_scan.c | 16 ++++++++++------
 include/linux/dmi.h         | 14 ++++++++++++++
 include/linux/fwnode.h      |  1 +
 3 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index da471b2..5519b4f 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -242,6 +242,12 @@ static void __init dmi_save_type(const struct dmi_header *dm, int slot,
 	dmi_ident[slot] = s;
 }
 
+static void __init dmi_devices_list_add(struct dmi_device *dev)
+{
+	dev->fwnode.type = FWNODE_DMI;
+	list_add(&dev->list, &dmi_devices);
+}
+
 static void __init dmi_save_one_device(int type, const char *name)
 {
 	struct dmi_device *dev;
@@ -257,8 +263,7 @@ static void __init dmi_save_one_device(int type, const char *name)
 	dev->type = type;
 	strcpy((char *)(dev + 1), name);
 	dev->name = (char *)(dev + 1);
-	dev->device_data = NULL;
-	list_add(&dev->list, &dmi_devices);
+	dmi_devices_list_add(dev);
 }
 
 static void __init dmi_save_devices(const struct dmi_header *dm)
@@ -293,9 +298,8 @@ static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
 
 		dev->type = DMI_DEV_TYPE_OEM_STRING;
 		dev->name = devname;
-		dev->device_data = NULL;
 
-		list_add(&dev->list, &dmi_devices);
+		dmi_devices_list_add(dev);
 	}
 }
 
@@ -318,7 +322,7 @@ static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
 	dev->name = "IPMI controller";
 	dev->device_data = data;
 
-	list_add_tail(&dev->list, &dmi_devices);
+	dmi_devices_list_add(dev);
 }
 
 static void __init dmi_save_dev_pciaddr(int instance, int segment, int bus,
@@ -345,7 +349,7 @@ static void __init dmi_save_dev_pciaddr(int instance, int segment, int bus,
 	dev->dev.name = (char *)&dev[1];
 	dev->dev.device_data = dev;
 
-	list_add(&dev->dev.list, &dmi_devices);
+	dmi_devices_list_add(&dev->dev);
 }
 
 static void __init dmi_save_extended_devices(const struct dmi_header *dm)
diff --git a/include/linux/dmi.h b/include/linux/dmi.h
index a930a4d..c8dd5b8 100644
--- a/include/linux/dmi.h
+++ b/include/linux/dmi.h
@@ -4,6 +4,7 @@
 #include <linux/list.h>
 #include <linux/kobject.h>
 #include <linux/mod_devicetable.h>
+#include <linux/fwnode.h>
 
 /* enum dmi_field is in mod_devicetable.h */
 
@@ -80,6 +81,7 @@ struct dmi_header {
 
 struct dmi_device {
 	struct list_head list;
+	struct fwnode_handle fwnode;
 	int type;
 	const char *name;
 	void *device_data;	/* Type specific data */
@@ -113,6 +115,18 @@ extern int dmi_walk(void (*decode)(const struct dmi_header *, void *),
 extern bool dmi_match(enum dmi_field f, const char *str);
 extern void dmi_memdev_name(u16 handle, const char **bank, const char **device);
 
+static inline bool is_dmi_fwnode(struct fwnode_handle *fwnode)
+{
+	return fwnode && fwnode->type == FWNODE_DMI;
+}
+
+static inline struct dmi_device *to_dmi_device(struct fwnode_handle *fwnode)
+{
+	if (is_dmi_fwnode(fwnode))
+		return container_of(fwnode, struct dmi_device, fwnode);
+	return NULL;
+}
+
 #else
 
 static inline int dmi_check_system(const struct dmi_system_id *list) { return 0; }
diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index 8516717..8690de2 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -19,6 +19,7 @@ enum fwnode_type {
 	FWNODE_ACPI_DATA,
 	FWNODE_PDATA,
 	FWNODE_IRQCHIP,
+	FWNODE_DMI,
 };
 
 struct fwnode_handle {
-- 
2.7.4

[PATCH v3 3/5] dmi: Add IPMI DMI scanning to the DMI code

[minyard]

From: Corey Minyard <cminyard@mvista.com>

It makes more sense to be there, and it's cleaner with the
upcoming conversion of IPMI DMI to a platform device.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: Jean Delvare <jdelvare@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Tested-by: Andy Lutomirski <luto@kernel.org>
---
 drivers/firmware/dmi_scan.c | 108 ++++++++++++++++++++++++++++++++++++++++++--
 include/linux/dmi.h         |  26 +++++++++++
 2 files changed, 129 insertions(+), 5 deletions(-)

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 5519b4f..16e5174 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -303,9 +303,105 @@ static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
 	}
 }
 
+#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(struct dmi_dev_ipmi *dev,
+				   const struct dmi_header *dm)
+{
+	const u8	*data = (const u8 *) dm;
+	unsigned long	base_addr;
+	u8              len = dm->length;
+	bool            slave_addr_set;
+
+	if (len < DMI_IPMI_MIN_LENGTH)
+		return;
+
+	dev->type = data[DMI_IPMI_TYPE];
+
+	memcpy(&base_addr, data + DMI_IPMI_ADDR, sizeof(unsigned long));
+	if (len >= DMI_IPMI_VER2_LENGTH) {
+		if (dev->type == IPMI_DMI_TYPE_SSIF) {
+			if ((data[DMI_IPMI_ADDR] >> 1) == 0) {
+				/*
+				 * Some broken systems put the I2C address in
+				 * the slave address field.  We try to
+				 * accommodate them here.
+				 */
+				dev->base_addr = data[DMI_IPMI_SLAVEADDR] >> 1;
+				dev->slave_addr = 0;
+				slave_addr_set = true;
+			} else {
+				dev->base_addr = data[DMI_IPMI_ADDR] >> 1;
+			}
+		} else {
+			if (base_addr & 1) {
+				/* I/O */
+				base_addr &= DMI_IPMI_IO_MASK;
+				dev->is_io_space = 1;
+			} else {
+				/* Memory */
+				dev->is_io_space = 0;
+			}
+
+			/*
+			 * If bit 4 of byte 0x10 is set, then the lsb
+			 * for the address is odd.
+			 */
+			base_addr |= (data[DMI_IPMI_ACCESS] >> 4) & 1;
+
+			dev->base_addr = base_addr;
+			dev->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 */
+				dev->offset = 1;
+				break;
+			case 1: /* 32-bit boundaries */
+				dev->offset = 4;
+				break;
+			case 2: /* 16-byte boundaries */
+				dev->offset = 16;
+				break;
+			default:
+				/* Leave 0 for undefined. */
+				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.
+		 */
+		dev->base_addr = base_addr & DMI_IPMI_IO_MASK;
+		dev->is_io_space = 1;
+		dev->offset = 1;
+	}
+
+	if (!slave_addr_set)
+		dev->slave_addr = data[DMI_IPMI_SLAVEADDR];
+
+	dev->good_data = 1;
+}
+
 static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
 {
-	struct dmi_device *dev;
+	struct dmi_dev_ipmi *dev;
 	void *data;
 
 	data = dmi_alloc(dm->length);
@@ -318,11 +414,13 @@ static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
 	if (!dev)
 		return;
 
-	dev->type = DMI_DEV_TYPE_IPMI;
-	dev->name = "IPMI controller";
-	dev->device_data = data;
+	dev->dev.type = DMI_DEV_TYPE_IPMI;
+	dev->dev.name = "IPMI controller";
+	dev->dev.device_data = data;
 
-	dmi_devices_list_add(dev);
+	dmi_decode_ipmi(dev, dm);
+
+	dmi_devices_list_add(&dev->dev);
 }
 
 static void __init dmi_save_dev_pciaddr(int instance, int segment, int bus,
diff --git a/include/linux/dmi.h b/include/linux/dmi.h
index c8dd5b8..96dc644 100644
--- a/include/linux/dmi.h
+++ b/include/linux/dmi.h
@@ -97,6 +97,24 @@ struct dmi_dev_onboard {
 	int devfn;
 };
 
+/* Device data for an IPMI entry. */
+struct dmi_dev_ipmi {
+	struct dmi_device dev;
+	u8		good_data;
+	u8		type;
+	u8		is_io_space;
+	u8		irq;
+	u8		offset;
+	u8		slave_addr;
+	unsigned long	base_addr;
+};
+
+/* dmi_ipmi_data type field */
+#define IPMI_DMI_TYPE_KCS	0x01
+#define IPMI_DMI_TYPE_SMIC	0x02
+#define IPMI_DMI_TYPE_BT	0x03
+#define IPMI_DMI_TYPE_SSIF	0x04
+
 extern struct kobject *dmi_kobj;
 extern int dmi_check_system(const struct dmi_system_id *list);
 const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list);
@@ -127,6 +145,14 @@ static inline struct dmi_device *to_dmi_device(struct fwnode_handle *fwnode)
 	return NULL;
 }
 
+static inline struct dmi_dev_ipmi *to_dmi_dev_ipmi(struct dmi_device *dev)
+{
+	if (!dev || dev->type != DMI_DEV_TYPE_IPMI)
+		return NULL;
+
+	return container_of(dev, struct dmi_dev_ipmi, dev);
+}
+
 #else
 
 static inline int dmi_check_system(const struct dmi_system_id *list) { return 0; }
-- 
2.7.4

[PATCH v3 4/5] dmi: Add IPMI DMI devices as platform devices

[minyard]

From: Corey Minyard <cminyard@mvista.com>

Have DMI create a platform device for every IPMI device it
finds.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: Jean Delvare <jdelvare@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Tested-by: Andy Lutomirski <luto@kernel.org>
---
 drivers/firmware/dmi_scan.c | 55 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 53 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 16e5174..6a9598b 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -7,6 +7,7 @@
 #include <linux/efi.h>
 #include <linux/bootmem.h>
 #include <linux/random.h>
+#include <linux/platform_device.h>
 #include <asm/dmi.h>
 #include <asm/unaligned.h>
 
@@ -783,6 +784,52 @@ static ssize_t raw_table_read(struct file *file, struct kobject *kobj,
 	return count;
 }
 
+static void __init dmi_add_platform_ipmi(struct dmi_device *dev, int *nr)
+{
+	struct platform_device *pdev;
+	struct dmi_dev_ipmi *ipmi_dev = to_dmi_dev_ipmi(dev);
+	int rv;
+
+	if (!ipmi_dev->good_data) {
+		pr_err("dmi: Invalid IPMI data, not creating platform device");
+		return;
+	}
+
+	if (ipmi_dev->type == IPMI_DMI_TYPE_SSIF)
+		pdev = platform_device_alloc("dmi-ipmi-ssif", *nr);
+	else
+		pdev = platform_device_alloc("dmi-ipmi-si", *nr);
+	if (!pdev) {
+		pr_err("dmi: Error allocation IPMI platform device");
+		return;
+	}
+	if (ipmi_dev->type == IPMI_DMI_TYPE_SSIF)
+		pdev->driver_override = "ipmi_ssif";
+	else
+		pdev->driver_override = "ipmi_si";
+
+	pdev->dev.fwnode = &dev->fwnode;
+	rv = platform_device_add(pdev);
+	if (rv) {
+		dev_err(&pdev->dev, "dmi: Unable to add device: %d\n", rv);
+		platform_device_del(pdev);
+		return;
+	}
+
+	(*nr)++;
+}
+
+static void __init dmi_add_platform_devices(void)
+{
+	struct dmi_device *dev;
+	int nr_ipmi = 0;
+
+	list_for_each_entry(dev, &dmi_devices, list) {
+		if (dev->type == DMI_DEV_TYPE_IPMI)
+			dmi_add_platform_ipmi(dev, &nr_ipmi);
+	}
+}
+
 static BIN_ATTR(smbios_entry_point, S_IRUSR, raw_table_read, NULL, 0);
 static BIN_ATTR(DMI, S_IRUSR, raw_table_read, NULL, 0);
 
@@ -823,9 +870,13 @@ static int __init dmi_init(void)
 	bin_attr_DMI.size = dmi_len;
 	bin_attr_DMI.private = dmi_table;
 	ret = sysfs_create_bin_file(tables_kobj, &bin_attr_DMI);
-	if (!ret)
-		return 0;
+	if (ret)
+		goto out_remove_bin_file;
+
+	dmi_add_platform_devices();
+	return 0;
 
+ out_remove_bin_file:
 	sysfs_remove_bin_file(tables_kobj,
 			      &bin_attr_smbios_entry_point);
  err_unmap:
-- 
2.7.4

[PATCH v3 5/5] ipmi: Convert DMI handling over to a platform device

[minyard]

From: Corey Minyard <cminyard@mvista.com>

Now that the DMI code creates a platform device for IPMI devices
in the firmware, use that instead of handling all the DMI work
in the IPMI driver itself.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Tested-by: Andy Lutomirski <luto@kernel.org>
---
 drivers/char/ipmi/ipmi_si_intf.c | 143 ++++++++-------------------------------
 drivers/char/ipmi/ipmi_ssif.c    | 119 +++++++++++++++++++++-----------
 2 files changed, 109 insertions(+), 153 deletions(-)

diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 1e25b52..866539f 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -2271,121 +2271,45 @@ static void spmi_find_bmc(void)
 #endif
 
 #ifdef CONFIG_DMI
-struct dmi_ipmi_data {
-	u8   		type;
-	u8   		addr_space;
-	unsigned long	base_addr;
-	u8   		irq;
-	u8              offset;
-	u8              slave_addr;
-};
-
-static int decode_dmi(const struct dmi_header *dm,
-				struct dmi_ipmi_data *dmi)
-{
-	const u8	*data = (const u8 *)dm;
-	unsigned long  	base_addr;
-	u8		reg_spacing;
-	u8              len = dm->length;
-
-	dmi->type = data[4];
-
-	memcpy(&base_addr, data+8, sizeof(unsigned long));
-	if (len >= 0x11) {
-		if (base_addr & 1) {
-			/* I/O */
-			base_addr &= 0xFFFE;
-			dmi->addr_space = IPMI_IO_ADDR_SPACE;
-		} else
-			/* Memory */
-			dmi->addr_space = IPMI_MEM_ADDR_SPACE;
-
-		/* If bit 4 of byte 0x10 is set, then the lsb for the address
-		   is odd. */
-		dmi->base_addr = base_addr | ((data[0x10] & 0x10) >> 4);
-
-		dmi->irq = data[0x11];
-
-		/* The top two bits of byte 0x10 hold the register spacing. */
-		reg_spacing = (data[0x10] & 0xC0) >> 6;
-		switch (reg_spacing) {
-		case 0x00: /* Byte boundaries */
-		    dmi->offset = 1;
-		    break;
-		case 0x01: /* 32-bit boundaries */
-		    dmi->offset = 4;
-		    break;
-		case 0x02: /* 16-byte boundaries */
-		    dmi->offset = 16;
-		    break;
-		default:
-		    /* Some other interface, just ignore it. */
-		    return -EIO;
-		}
-	} 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.
-		 */
-		dmi->base_addr = base_addr & 0xfffe;
-		dmi->addr_space = IPMI_IO_ADDR_SPACE;
-		dmi->offset = 1;
-	}
-
-	dmi->slave_addr = data[6];
-
-	return 0;
-}
-
-static void try_init_dmi(struct dmi_ipmi_data *ipmi_data)
+static int dmi_ipmi_probe(struct platform_device *pdev)
 {
+	struct dmi_device *dmi_dev = to_dmi_device(pdev->dev.fwnode);
+	struct dmi_dev_ipmi *ipmi_data = to_dmi_dev_ipmi(dmi_dev);
 	struct smi_info *info;
 
+	if (!si_trydmi || !ipmi_data)
+		return -ENODEV;
+
 	info = smi_info_alloc();
 	if (!info) {
-		printk(KERN_ERR PFX "Could not allocate SI data\n");
-		return;
+		pr_err(PFX "Could not allocate SI data\n");
+		return -ENOMEM;
 	}
 
 	info->addr_source = SI_SMBIOS;
-	printk(KERN_INFO PFX "probing via SMBIOS\n");
+	pr_info(PFX "probing via SMBIOS\n");
 
 	switch (ipmi_data->type) {
-	case 0x01: /* KCS */
+	case IPMI_DMI_TYPE_KCS:
 		info->si_type = SI_KCS;
 		break;
-	case 0x02: /* SMIC */
+	case IPMI_DMI_TYPE_SMIC:
 		info->si_type = SI_SMIC;
 		break;
-	case 0x03: /* BT */
+	case IPMI_DMI_TYPE_BT:
 		info->si_type = SI_BT;
 		break;
 	default:
 		kfree(info);
-		return;
+		return -EINVAL;
 	}
 
-	switch (ipmi_data->addr_space) {
-	case IPMI_MEM_ADDR_SPACE:
-		info->io_setup = mem_setup;
-		info->io.addr_type = IPMI_MEM_ADDR_SPACE;
-		break;
-
-	case IPMI_IO_ADDR_SPACE:
+	if (ipmi_data->is_io_space) {
 		info->io_setup = port_setup;
 		info->io.addr_type = IPMI_IO_ADDR_SPACE;
-		break;
-
-	default:
-		kfree(info);
-		printk(KERN_WARNING PFX "Unknown SMBIOS I/O Address type: %d\n",
-		       ipmi_data->addr_space);
-		return;
+	} else {
+		info->io_setup = mem_setup;
+		info->io.addr_type = IPMI_MEM_ADDR_SPACE;
 	}
 	info->io.addr_data = ipmi_data->base_addr;
 
@@ -2401,6 +2325,8 @@ static void try_init_dmi(struct dmi_ipmi_data *ipmi_data)
 	if (info->irq)
 		info->irq_setup = std_irq_setup;
 
+	info->dev = &pdev->dev;
+
 	pr_info("ipmi_si: SMBIOS: %s %#lx regsize %d spacing %d irq %d\n",
 		 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem",
 		 info->io.addr_data, info->io.regsize, info->io.regspacing,
@@ -2408,21 +2334,13 @@ static void try_init_dmi(struct dmi_ipmi_data *ipmi_data)
 
 	if (add_smi(info))
 		kfree(info);
-}
 
-static void dmi_find_bmc(void)
+	return 0;
+}
+#else
+static int dmi_ipmi_probe(struct platform_device *pdev)
 {
-	const struct dmi_device *dev = NULL;
-	struct dmi_ipmi_data data;
-	int                  rv;
-
-	while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev))) {
-		memset(&data, 0, sizeof(data));
-		rv = decode_dmi((const struct dmi_header *) dev->device_data,
-				&data);
-		if (!rv)
-			try_init_dmi(&data);
-	}
+	return -ENODEV;
 }
 #endif /* CONFIG_DMI */
 
@@ -2810,7 +2728,10 @@ static int ipmi_probe(struct platform_device *dev)
 	if (of_ipmi_probe(dev) == 0)
 		return 0;
 
-	return acpi_ipmi_probe(dev);
+	if (acpi_ipmi_probe(dev) == 0)
+		return 0;
+
+	return dmi_ipmi_probe(dev);
 }
 
 static int ipmi_remove(struct platform_device *dev)
@@ -3527,7 +3448,7 @@ static int add_smi(struct smi_info *new_smi)
 	       si_to_str[new_smi->si_type]);
 	mutex_lock(&smi_infos_lock);
 	if (!is_new_interface(new_smi)) {
-		printk(KERN_CONT " duplicate interface\n");
+		printk(KERN_CONT ": duplicate interface\n");
 		rv = -EBUSY;
 		goto out_err;
 	}
@@ -3818,11 +3739,6 @@ static int init_ipmi_si(void)
 	}
 #endif
 
-#ifdef CONFIG_DMI
-	if (si_trydmi)
-		dmi_find_bmc();
-#endif
-
 #ifdef CONFIG_ACPI
 	if (si_tryacpi)
 		spmi_find_bmc();
@@ -3983,6 +3899,7 @@ static void cleanup_ipmi_si(void)
 }
 module_exit(cleanup_ipmi_si);
 
+MODULE_ALIAS("platform:dmi-ipmi-si");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
 MODULE_DESCRIPTION("Interface to the IPMI driver for the KCS, SMIC, and BT"
diff --git a/drivers/char/ipmi/ipmi_ssif.c b/drivers/char/ipmi/ipmi_ssif.c
index 8b3be8b..a8448705 100644
--- a/drivers/char/ipmi/ipmi_ssif.c
+++ b/drivers/char/ipmi/ipmi_ssif.c
@@ -181,6 +181,8 @@ struct ssif_addr_info {
 	int slave_addr;
 	enum ipmi_addr_src addr_src;
 	union ipmi_smi_info_union addr_info;
+	struct device *dev;
+	struct i2c_client *client;
 
 	struct mutex clients_mutex;
 	struct list_head clients;
@@ -1439,6 +1441,7 @@ static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id)
 			ssif_info->addr_source = addr_info->addr_src;
 			ssif_info->ssif_debug = addr_info->debug;
 			ssif_info->addr_info = addr_info->addr_info;
+			addr_info->client = client;
 			slave_addr = addr_info->slave_addr;
 		}
 	}
@@ -1675,8 +1678,19 @@ static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	}
 
  out:
-	if (rv)
+	if (rv) {
+		/*
+		 * Note that if addr_info->client is assigned, we
+		 * leave it.  The i2c client hangs around even if we
+		 * return a failure here, and the failure here is not
+		 * propagated back to the i2c code.  This seems to be
+		 * design intent, strange as it may be.  But if we
+		 * don't leave it, ssif_platform_remove will not remove
+		 * the client like it should.
+		 */
+		dev_err(&client->dev, "Unable to start IPMI SSIF: %d\n", rv);
 		kfree(ssif_info);
+	}
 	kfree(resp);
 	return rv;
 
@@ -1701,7 +1715,8 @@ static int ssif_adapter_handler(struct device *adev, void *opaque)
 
 static int new_ssif_client(int addr, char *adapter_name,
 			   int debug, int slave_addr,
-			   enum ipmi_addr_src addr_src)
+			   enum ipmi_addr_src addr_src,
+			   struct device *dev)
 {
 	struct ssif_addr_info *addr_info;
 	int rv = 0;
@@ -1731,9 +1746,14 @@ static int new_ssif_client(int addr, char *adapter_name,
 		sizeof(addr_info->binfo.type));
 	addr_info->binfo.addr = addr;
 	addr_info->binfo.platform_data = addr_info;
+	if (dev)
+		addr_info->binfo.fwnode = dev->fwnode;
 	addr_info->debug = debug;
 	addr_info->slave_addr = slave_addr;
 	addr_info->addr_src = addr_src;
+	addr_info->dev = dev;
+
+	dev_set_drvdata(dev, addr_info);
 
 	list_add_tail(&addr_info->link, &ssif_infos);
 
@@ -1872,7 +1892,7 @@ static int try_init_spmi(struct SPMITable *spmi)
 
 	myaddr = spmi->addr.address >> 1;
 
-	return new_ssif_client(myaddr, NULL, 0, 0, SI_SPMI);
+	return new_ssif_client(myaddr, NULL, 0, 0, SI_SPMI, NULL);
 }
 
 static void spmi_find_bmc(void)
@@ -1901,48 +1921,30 @@ static void spmi_find_bmc(void) { }
 #endif
 
 #ifdef CONFIG_DMI
-static int decode_dmi(const struct dmi_device *dmi_dev)
+static int dmi_ipmi_probe(struct platform_device *pdev)
 {
-	struct dmi_header *dm = dmi_dev->device_data;
-	u8             *data = (u8 *) dm;
-	u8             len = dm->length;
-	unsigned short myaddr;
-	int            slave_addr;
-
-	if (num_addrs >= MAX_SSIF_BMCS)
-		return -1;
+	struct dmi_device *dmi_dev = to_dmi_device(pdev->dev.fwnode);
+	struct dmi_dev_ipmi *ipmi_data = to_dmi_dev_ipmi(dmi_dev);
 
-	if (len < 9)
-		return -1;
-
-	if (data[0x04] != 4) /* Not SSIF */
-		return -1;
+	if (!ssif_trydmi || !ipmi_data)
+		return -ENODEV;
 
-	if ((data[8] >> 1) == 0) {
-		/*
-		 * Some broken systems put the I2C address in
-		 * the slave address field.  We try to
-		 * accommodate them here.
-		 */
-		myaddr = data[6] >> 1;
-		slave_addr = 0;
-	} else {
-		myaddr = data[8] >> 1;
-		slave_addr = data[6];
+	if (!ipmi_data->good_data) {
+		pr_err(PFX "DMI data for this device was invalid.\n");
+		return -EINVAL;
 	}
 
-	return new_ssif_client(myaddr, NULL, 0, 0, SI_SMBIOS);
-}
-
-static void dmi_iterator(void)
-{
-	const struct dmi_device *dev = NULL;
+	if (ipmi_data->type != IPMI_DMI_TYPE_SSIF)
+		return -ENODEV;
 
-	while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev)))
-		decode_dmi(dev);
+	return new_ssif_client(ipmi_data->base_addr, NULL, 0,
+			       ipmi_data->slave_addr, SI_SMBIOS, &pdev->dev);
 }
 #else
-static void dmi_iterator(void) { }
+static int dmi_ipmi_probe(struct platform_device *pdev)
+{
+	return -ENODEV;
+}
 #endif
 
 static const struct i2c_device_id ssif_id[] = {
@@ -1963,6 +1965,36 @@ static struct i2c_driver ssif_i2c_driver = {
 	.detect		= ssif_detect
 };
 
+static int ssif_platform_probe(struct platform_device *dev)
+{
+	return dmi_ipmi_probe(dev);
+}
+
+static int ssif_platform_remove(struct platform_device *dev)
+{
+	struct ssif_addr_info *addr_info = dev_get_drvdata(&dev->dev);
+
+	if (!addr_info)
+		return 0;
+
+	mutex_lock(&ssif_infos_mutex);
+	if (addr_info->client)
+		i2c_unregister_device(addr_info->client);
+
+	list_del(&addr_info->link);
+	kfree(addr_info);
+	mutex_unlock(&ssif_infos_mutex);
+	return 0;
+}
+
+static struct platform_driver ipmi_driver = {
+	.driver = {
+		.name = DEVICE_NAME,
+	},
+	.probe		= ssif_platform_probe,
+	.remove		= ssif_platform_remove,
+};
+
 static int init_ipmi_ssif(void)
 {
 	int i;
@@ -1977,7 +2009,7 @@ static int init_ipmi_ssif(void)
 	for (i = 0; i < num_addrs; i++) {
 		rv = new_ssif_client(addr[i], adapter_name[i],
 				     dbg[i], slave_addrs[i],
-				     SI_HARDCODED);
+				     SI_HARDCODED, NULL);
 		if (rv)
 			pr_err(PFX
 			       "Couldn't add hardcoded device at addr 0x%x\n",
@@ -1987,8 +2019,7 @@ static int init_ipmi_ssif(void)
 	if (ssif_tryacpi)
 		ssif_i2c_driver.driver.acpi_match_table	=
 			ACPI_PTR(ssif_acpi_match);
-	if (ssif_trydmi)
-		dmi_iterator();
+
 	if (ssif_tryacpi)
 		spmi_find_bmc();
 
@@ -1998,6 +2029,11 @@ static int init_ipmi_ssif(void)
 	if (!rv)
 		initialized = true;
 
+	/* Wait until here so ACPI devices will start first. */
+	rv = platform_driver_register(&ipmi_driver);
+	if (rv)
+		pr_err(PFX "Unable to register driver: %d\n", rv);
+
 	return rv;
 }
 module_init(init_ipmi_ssif);
@@ -2009,12 +2045,15 @@ static void cleanup_ipmi_ssif(void)
 
 	initialized = false;
 
+	platform_driver_unregister(&ipmi_driver);
+
 	i2c_del_driver(&ssif_i2c_driver);
 
 	free_ssif_clients();
 }
 module_exit(cleanup_ipmi_ssif);
 
+MODULE_ALIAS("platform:dmi-ipmi-ssif");
 MODULE_AUTHOR("Todd C Davis <todd.c.davis@intel.com>, Corey Minyard <minyard@acm.org>");
 MODULE_DESCRIPTION("IPMI driver for management controllers on a SMBus");
 MODULE_LICENSE("GPL");
-- 
2.7.4

Re: [Openipmi-developer] [PATCH v3 0/5] dmi: Rework to get IPMI autoloading from DMI tables

[Corey Minyard]

Is there any possibility to get this in to the next Linux release?
Do I need to re-submit?

-corey

On 04/27/2016 08:04 AM, minyard@acm.org wrote:
> This is unchanged from v2, just rebased onto a more current kernel.
>
> I haven't heard anything about this.  If we could get this functionality
> in to the 4.7 kernel, that would be really helpful.
>
> The only think I really don't like about this is using driver_override,
> but otherwise a bunch of infrastructure would have to be added, and
> that's probably not wise.  So I'm happy with this set.
>
> -corey
>
>