[3/4] i2c: smbus: Add a way to instantiate SPD EEPROMs automatically
diff mbox series

Message ID 20191014113950.1f989ba6@endymion
State New
Headers show
Series
  • Instantiate SPD EEPROMs at boot on x86
Related show

Commit Message

Jean Delvare Oct. 14, 2019, 9:39 a.m. UTC
In simple cases we can instantiate SPD EEPROMs on the SMBus
automatically. Start with just DDR2, DDR3 and DDR4 on x86 for now,
and only for systems with no more than 4 memory slots. These
limitations may be lifted later.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
---
 drivers/i2c/i2c-smbus.c   |  104 +++++++++++++++++++++++++++++++++++++++++++++-
 include/linux/i2c-smbus.h |   11 ++++
 2 files changed, 113 insertions(+), 2 deletions(-)

Comments

Jean Delvare Oct. 14, 2019, 2:55 p.m. UTC | #1
On Mon, 14 Oct 2019 18:21:50 +0800, kbuild test robot wrote:
> Hi Jean,
> 
> I love your patch! Perhaps something to improve:
> 
> [auto build test WARNING on linus/master]
> [cannot apply to v5.4-rc3 next-20191011]
> [if your patch is applied to the wrong git tree, please drop us a note to help
> improve the system. BTW, we also suggest to use '--base' option to specify the
> base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
> 
> url:    https://github.com/0day-ci/linux/commits/Jean-Delvare/Instantiate-SPD-EEPROMs-at-boot-on-x86/20191014-174252
> config: sparc64-allmodconfig (attached as .config)
> compiler: sparc64-linux-gcc (GCC) 7.4.0
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # save the attached .config to linux build tree
>         GCC_VERSION=7.4.0 make.cross ARCH=sparc64 
> 
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@intel.com>
> 
> All warnings (new ones prefixed by >>):
> 
>    In file included from drivers/i2c/i2c-core-base.c:24:0:
>    include/linux/i2c-smbus.h: In function 'i2c_register_spd':
> >> include/linux/i2c-smbus.h:52:9: warning: 'return' with a value, in function returning void  
>      return 0;
>             ^
>    include/linux/i2c-smbus.h:50:13: note: declared here
>     static void i2c_register_spd(struct i2c_adapter *adap)
>                 ^~~~~~~~~~~~~~~~
>    In file included from drivers/i2c/i2c-core-base.c:24:0:
>    At top level:
>    include/linux/i2c-smbus.h:50:13: warning: 'i2c_register_spd' defined but not used [-Wunused-function]
> 
> vim +/return +52 include/linux/i2c-smbus.h
> 
>     46	
>     47	#if IS_ENABLED(CONFIG_I2C_SMBUS) && IS_ENABLED(CONFIG_DMI)
>     48	void i2c_register_spd(struct i2c_adapter *adap);
>     49	#else
>     50	static void i2c_register_spd(struct i2c_adapter *adap)
>     51	{
>   > 52		return 0;  
>     53	}
>     54	#endif
>     55	

Fixed, thanks Elliot.

Patch
diff mbox series

--- linux-5.3.orig/drivers/i2c/i2c-smbus.c	2019-10-04 15:04:16.601640711 +0200
+++ linux-5.3/drivers/i2c/i2c-smbus.c	2019-10-11 13:01:59.596425003 +0200
@@ -3,10 +3,11 @@ 
  * i2c-smbus.c - SMBus extensions to the I2C protocol
  *
  * Copyright (C) 2008 David Brownell
- * Copyright (C) 2010 Jean Delvare <jdelvare@suse.de>
+ * Copyright (C) 2010-2019 Jean Delvare <jdelvare@suse.de>
  */
 
 #include <linux/device.h>
+#include <linux/dmi.h>
 #include <linux/i2c.h>
 #include <linux/i2c-smbus.h>
 #include <linux/interrupt.h>
@@ -203,6 +204,107 @@  EXPORT_SYMBOL_GPL(i2c_handle_smbus_alert
 
 module_i2c_driver(smbalert_driver);
 
+/*
+ * SPD is not part of SMBus but we include it here for convenience as the
+ * target systems are the same.
+ * Restrictions to automatic SPD instantiation:
+ *  - Only works if all filled slots have the same memory type
+ *  - Only works for DDR2, DDR3 and DDR4 for now
+ *  - Only works on systems with 1 to 4 memory slots
+ */
+#if IS_ENABLED(CONFIG_DMI)
+void i2c_register_spd(struct i2c_adapter *adap)
+{
+	int n, slot_count = 0, dimm_count = 0;
+	u16 handle;
+	u8 common_mem_type = 0x0, mem_type;
+	u64 mem_size;
+	const char *name;
+
+	while ((handle = dmi_memdev_handle(slot_count)) != 0xffff) {
+		slot_count++;
+
+		/* Skip empty slots */
+		mem_size = dmi_memdev_size(handle);
+		if (!mem_size)
+			continue;
+
+		/* Skip undefined memory type */
+		mem_type = dmi_memdev_type(handle);
+		if (mem_type <= 0x02)		/* Invalid, Other, Unknown */
+			continue;
+
+		if (!common_mem_type) {
+			/* First filled slot */
+			common_mem_type = mem_type;
+		} else {
+			/* Check that all filled slots have the same type */
+			if (mem_type != common_mem_type) {
+				dev_warn(&adap->dev,
+					 "Different memory types mixed, not instantiating SPD\n");
+				return;
+			}
+		}
+		dimm_count++;
+	}
+
+	/* No useful DMI data, bail out */
+	if (!dimm_count)
+		return;
+
+	dev_info(&adap->dev, "%d/%d memory slots populated (from DMI)\n",
+		 dimm_count, slot_count);
+
+	if (slot_count > 4) {
+		dev_warn(&adap->dev,
+			 "Systems with more than 4 memory slots not supported yet, not instantiating SPD\n");
+		return;
+	}
+
+	switch (common_mem_type) {
+	case 0x13:	/* DDR2 */
+	case 0x18:	/* DDR3 */
+	case 0x1C:	/* LPDDR2 */
+	case 0x1D:	/* LPDDR3 */
+		name = "spd";
+		break;
+	case 0x1A:	/* DDR4 */
+	case 0x1E:	/* LPDDR4 */
+		name = "ee1004";
+		break;
+	default:
+		dev_info(&adap->dev,
+			 "Memory type 0x%02x not supported yet, not instantiating SPD\n",
+			 common_mem_type);
+		return;
+	}
+
+	/*
+	 * We don't know in which slots the memory modules are. We could
+	 * try to guess from the slot names, but that would be rather complex
+	 * and unreliable, so better probe all possible addresses until we
+	 * have found all memory modules.
+	 */
+	for (n = 0; n < slot_count && dimm_count; n++) {
+		struct i2c_board_info info;
+		unsigned short addr_list[2];
+
+		memset(&info, 0, sizeof(struct i2c_board_info));
+		strlcpy(info.type, name, I2C_NAME_SIZE);
+		addr_list[0] = 0x50 + n;
+		addr_list[1] = I2C_CLIENT_END;
+
+		if (i2c_new_probed_device(adap, &info, addr_list, NULL)) {
+			dev_info(&adap->dev,
+				 "Successfully instantiated SPD at 0x%hx\n",
+				 addr_list[0]);
+			dimm_count--;
+		}
+	}
+}
+EXPORT_SYMBOL_GPL(i2c_register_spd);
+#endif
+
 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
 MODULE_DESCRIPTION("SMBus protocol extensions support");
 MODULE_LICENSE("GPL");
--- linux-5.3.orig/include/linux/i2c-smbus.h	2019-10-04 15:04:16.601640711 +0200
+++ linux-5.3/include/linux/i2c-smbus.h	2019-10-11 11:03:51.432166962 +0200
@@ -2,7 +2,7 @@ 
 /*
  * i2c-smbus.h - SMBus extensions to the I2C protocol
  *
- * Copyright (C) 2010 Jean Delvare <jdelvare@suse.de>
+ * Copyright (C) 2010-2019 Jean Delvare <jdelvare@suse.de>
  */
 
 #ifndef _LINUX_I2C_SMBUS_H
@@ -42,6 +42,15 @@  static inline int of_i2c_setup_smbus_ale
 {
 	return 0;
 }
+#endif
+
+#if IS_ENABLED(CONFIG_I2C_SMBUS) && IS_ENABLED(CONFIG_DMI)
+void i2c_register_spd(struct i2c_adapter *adap);
+#else
+static void i2c_register_spd(struct i2c_adapter *adap)
+{
+	return 0;
+}
 #endif
 
 #endif /* _LINUX_I2C_SMBUS_H */