x86/platform/uv: Add new uv_sysfs platform driver

Add the uv_sysfs driver to construct a read-only sysfs interface at
/sys/firmware/sgi_uv/ to expose information gathered from UV BIOS. This
information includes:

  * UV Hub descriptions, including physical location
  * Cabling layout between hubs on the fabric
  * PCI topology, including physical location of PCI cards

Together, the information provides a robust physical description of a UV
system, useful for correlating to performance data or performing remote
support.
Signed-off-by: Justin Ernst <justin.ernst@hpe.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Steve Wahl <steve.wahl@hpe.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lkml.kernel.org/r/20201125175444.279074-4-justin.ernst@hpe.com

drivers/platform/x86/Kconfig

@@ -78,6 +78,17 @@ config HUAWEI_WMI
 	  To compile this driver as a module, choose M here: the module
 	  will be called huawei-wmi.
 
+config UV_SYSFS
+	tristate "Sysfs structure for UV systems"
+	depends on X86_UV
+	depends on SYSFS
+	help
+	  This driver supports a sysfs tree describing information about
+	  UV systems at /sys/firmware/sgi_uv/.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called uv_sysfs.
+
 config INTEL_WMI_SBL_FW_UPDATE
 	tristate "Intel WMI Slim Bootloader firmware update signaling driver"
 	depends on ACPI_WMI

drivers/platform/x86/Makefile

@@ -62,6 +62,9 @@ obj-$(CONFIG_HP_WIRELESS)	+= hp-wireless.o
 obj-$(CONFIG_HP_WMI)		+= hp-wmi.o
 obj-$(CONFIG_TC1100_WMI)	+= tc1100-wmi.o
 
+# Hewlett Packard Enterprise
+obj-$(CONFIG_UV_SYSFS)       += uv_sysfs.o
+
 # IBM Thinkpad and Lenovo
 obj-$(CONFIG_IBM_RTL)		+= ibm_rtl.o
 obj-$(CONFIG_IDEAPAD_LAPTOP)	+= ideapad-laptop.o