[tip: x86/cpu] x86/cpu/vfm: Add new macros to work with (vendor/family/model) values

tip-bot2 for Tony Luck
2024-04-22T10:01:12Z

The following commit has been merged into the x86/cpu branch of tip:

Commit-ID: e6dfdc2e89a0adedf455814c91b977d6a584cc88
Gitweb: https://git.kernel.org/tip/e6dfdc2e89a0adedf455814c91b977d6a584cc88
Author: Tony Luck <tony.luck@intel.com>
AuthorDate: Tue, 16 Apr 2024 14:19:04 -07:00
Committer: Borislav Petkov (AMD) <bp@alien8.de>
CommitterDate: Mon, 22 Apr 2024 11:43:55 +02:00

x86/cpu/vfm: Add new macros to work with (vendor/family/model) values

To avoid adding a slew of new macros for each new Intel CPU family
switch over from providing CPU model number #defines to a new
scheme that encodes vendor, family, and model in a single number.

[ bp: s/casted/cast/g ]

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240416211941.9369-3-tony.luck@intel.com
---
arch/x86/include/asm/cpu_device_id.h | 93 +++++++++++++++++++++++++++-
1 file changed, 93 insertions(+)

diff --git a/arch/x86/include/asm/cpu_device_id.h b/arch/x86/include/asm/cpu_device_id.h
index bf4e065..970a232 100644
--- a/arch/x86/include/asm/cpu_device_id.h
+++ b/arch/x86/include/asm/cpu_device_id.h
@@ -3,6 +3,39 @@
#define _ASM_X86_CPU_DEVICE_ID

/*
+ * Can't use <linux/bitfield.h> because it generates expressions that
+ * cannot be used in structure initializers. Bitfield construction
+ * here must match the union in struct cpuinfo_86:
+ * union {
+ * struct {
+ * __u8 x86_model;
+ * __u8 x86;
+ * __u8 x86_vendor;
+ * __u8 x86_reserved;
+ * };
+ * __u32 x86_vfm;
+ * };
+ */
+#define VFM_MODEL_BIT 0
+#define VFM_FAMILY_BIT 8
+#define VFM_VENDOR_BIT 16
+#define VFM_RSVD_BIT 24
+
+#define VFM_MODEL_MASK GENMASK(VFM_FAMILY_BIT - 1, VFM_MODEL_BIT)
+#define VFM_FAMILY_MASK GENMASK(VFM_VENDOR_BIT - 1, VFM_FAMILY_BIT)
+#define VFM_VENDOR_MASK GENMASK(VFM_RSVD_BIT - 1, VFM_VENDOR_BIT)
+
+#define VFM_MODEL(vfm) (((vfm) & VFM_MODEL_MASK) >> VFM_MODEL_BIT)
+#define VFM_FAMILY(vfm) (((vfm) & VFM_FAMILY_MASK) >> VFM_FAMILY_BIT)
+#define VFM_VENDOR(vfm) (((vfm) & VFM_VENDOR_MASK) >> VFM_VENDOR_BIT)
+
+#define VFM_MAKE(_vendor, _family, _model) ( \
+ ((_model) << VFM_MODEL_BIT) | \
+ ((_family) << VFM_FAMILY_BIT) | \
+ ((_vendor) << VFM_VENDOR_BIT) \
+)
+
+/*
* Declare drivers belonging to specific x86 CPUs
* Similar in spirit to pci_device_id and related PCI functions
*
@@ -49,6 +82,16 @@
.driver_data = (unsigned long) _data \
}

+#define X86_MATCH_VENDORID_FAM_MODEL_STEPPINGS_FEATURE(_vendor, _family, _model, \
+ _steppings, _feature, _data) { \
+ .vendor = _vendor, \
+ .family = _family, \
+ .model = _model, \
+ .steppings = _steppings, \
+ .feature = _feature, \
+ .driver_data = (unsigned long) _data \
+}
+
/**
* X86_MATCH_VENDOR_FAM_MODEL_FEATURE - Macro for CPU matching
* @_vendor: The vendor name, e.g. INTEL, AMD, HYGON, ..., ANY
@@ -164,6 +207,56 @@
X86_MATCH_VENDOR_FAM_MODEL_STEPPINGS_FEATURE(INTEL, 6, INTEL_FAM6_##model, \
steppings, X86_FEATURE_ANY, data)

+/**
+ * X86_MATCH_VFM - Match encoded vendor/family/model
+ * @vfm: Encoded 8-bits each for vendor, family, model
+ * @data: Driver specific data or NULL. The internal storage
+ * format is unsigned long. The supplied value, pointer
+ * etc. is cast to unsigned long internally.
+ *
+ * Stepping and feature are set to wildcards
+ */
+#define X86_MATCH_VFM(vfm, data) \
+ X86_MATCH_VENDORID_FAM_MODEL_STEPPINGS_FEATURE( \
+ VFM_VENDOR(vfm), \
+ VFM_FAMILY(vfm), \
+ VFM_MODEL(vfm), \
+ X86_STEPPING_ANY, X86_FEATURE_ANY, data)
+
+/**
+ * X86_MATCH_VFM_STEPPINGS - Match encoded vendor/family/model/stepping
+ * @vfm: Encoded 8-bits each for vendor, family, model
+ * @steppings: Bitmask of steppings to match
+ * @data: Driver specific data or NULL. The internal storage
+ * format is unsigned long. The supplied value, pointer
+ * etc. is cast to unsigned long internally.
+ *
+ * feature is set to wildcard
+ */
+#define X86_MATCH_VFM_STEPPINGS(vfm, steppings, data) \
+ X86_MATCH_VENDORID_FAM_MODEL_STEPPINGS_FEATURE( \
+ VFM_VENDOR(vfm), \
+ VFM_FAMILY(vfm), \
+ VFM_MODEL(vfm), \
+ steppings, X86_FEATURE_ANY, data)
+
+/**
+ * X86_MATCH_VFM_FEATURE - Match encoded vendor/family/model/feature
+ * @vfm: Encoded 8-bits each for vendor, family, model
+ * @feature: A X86_FEATURE bit
+ * @data: Driver specific data or NULL. The internal storage
+ * format is unsigned long. The supplied value, pointer
+ * etc. is cast to unsigned long internally.
+ *
+ * Steppings is set to wildcard
+ */
+#define X86_MATCH_VFM_FEATURE(vfm, feature, data) \
+ X86_MATCH_VENDORID_FAM_MODEL_STEPPINGS_FEATURE( \
+ VFM_VENDOR(vfm), \
+ VFM_FAMILY(vfm), \
+ VFM_MODEL(vfm), \
+ X86_STEPPING_ANY, feature, data)
+
/*
* Match specific microcode revisions.
*