diff options
| author | Tony Luck <tony.luck@intel.com> | 2018-03-12 21:24:29 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2018-03-14 14:49:53 +0300 |
| commit | 6deae96b42eb1fa84938088087de0bd748f53093 (patch) | |
| tree | 99e1f531833a9d88655196e02d24e320788085b5 /drivers | |
| parent | 23222f8f8dce6a6d014bc5b7107a83ebe2a9c022 (diff) | |
| download | linux-6deae96b42eb1fa84938088087de0bd748f53093.tar.xz | |
firmware, DMI: Add function to look up a handle and return DIMM size
When we first scan the SMBIOS table, save the size of the DIMM.
Provide a function for other code (EDAC driver) to look up the size
of a DIMM from its SMBIOS handle.
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Cc: Aristeu Rozanski <aris@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: linux-acpi@vger.kernel.org
Cc: linux-nvdimm@lists.01.org
Link: http://lkml.kernel.org/r/20180312182430.10335-5-tony.luck@intel.com
Signed-off-by: Borislav Petkov <bp@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/firmware/dmi_scan.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c index e763e1484331..35c6c74c9304 100644 --- a/drivers/firmware/dmi_scan.c +++ b/drivers/firmware/dmi_scan.c @@ -32,6 +32,7 @@ static char dmi_ids_string[128] __initdata; static struct dmi_memdev_info { const char *device; const char *bank; + u64 size; /* bytes */ u16 handle; } *dmi_memdev; static int dmi_memdev_nr; @@ -386,6 +387,8 @@ static void __init save_mem_devices(const struct dmi_header *dm, void *v) { const char *d = (const char *)dm; static int nr; + u64 bytes; + u16 size; if (dm->type != DMI_ENTRY_MEM_DEVICE || dm->length < 0x12) return; @@ -396,6 +399,20 @@ static void __init save_mem_devices(const struct dmi_header *dm, void *v) dmi_memdev[nr].handle = get_unaligned(&dm->handle); dmi_memdev[nr].device = dmi_string(dm, d[0x10]); dmi_memdev[nr].bank = dmi_string(dm, d[0x11]); + + size = get_unaligned((u16 *)&d[0xC]); + if (size == 0) + bytes = 0; + else if (size == 0xffff) + bytes = ~0ull; + else if (size & 0x8000) + bytes = (u64)(size & 0x7fff) << 10; + else if (size != 0x7fff) + bytes = (u64)size << 20; + else + bytes = (u64)get_unaligned((u32 *)&d[0x1C]) << 20; + + dmi_memdev[nr].size = bytes; nr++; } @@ -1065,3 +1082,17 @@ void dmi_memdev_name(u16 handle, const char **bank, const char **device) } } EXPORT_SYMBOL_GPL(dmi_memdev_name); + +u64 dmi_memdev_size(u16 handle) +{ + int n; + + if (dmi_memdev) { + for (n = 0; n < dmi_memdev_nr; n++) { + if (handle == dmi_memdev[n].handle) + return dmi_memdev[n].size; + } + } + return ~0ull; +} +EXPORT_SYMBOL_GPL(dmi_memdev_size); |