linux-kernel - [PATCH v4 3/6] x86/microcode/intel: Define staging state struct

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Message-ID: <20250813172649.15474-4-chang.seok.bae@intel.com>
Date: Wed, 13 Aug 2025 10:26:46 -0700
From: "Chang S. Bae" <chang.seok.bae@...el.com>
To: x86@...nel.org
Cc: tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	colinmitchell@...gle.com,
	chao.gao@...el.com,
	abusse@...zon.de,
	chang.seok.bae@...el.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 3/6] x86/microcode/intel: Define staging state struct

To facilitate a structured staging handler, a set of functions will be
introduced. Define staging_state struct to simplify function prototypes
by consolidating relevant data, instead of passing multiple local
variables.

Signed-off-by: Chang S. Bae <chang.seok.bae@...el.com>
Tested-by: Anselm Busse <abusse@...zon.de>
---
V1 -> V2: New patch

Prior to V2, local variables were used to track state values, with the
intention of improving readability by explicitly passing them between
functions. However, given feedbacks, introducing a dedicated data
structure looks to provide a benefit by simplifying the main loop.
---
 arch/x86/kernel/cpu/microcode/intel.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 468c4d3d5d66..36b426a90844 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -54,6 +54,27 @@ struct extended_sigtable {
 	struct extended_signature	sigs[];
 };
 
+/**
+ * struct staging_state - Tracks the current staging process state
+ *
+ * @mmio_base:		MMIO base address for staging
+ * @ucode_ptr:		Pointer to the microcode image
+ * @ucode_len:		Total size of the microcode image
+ * @chunk_size:		Size of each data piece
+ * @bytes_sent:		Total bytes transmitted so far
+ * @offset:		Current offset in the microcode image
+ * @state:		Current state of the staging process
+ */
+struct staging_state {
+	void __iomem		*mmio_base;
+	void			*ucode_ptr;
+	unsigned int		ucode_len;
+	unsigned int		chunk_size;
+	unsigned int		bytes_sent;
+	unsigned int		offset;
+	enum ucode_state	state;
+};
+
 #define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE)
 #define EXT_HEADER_SIZE		(sizeof(struct extended_sigtable))
 #define EXT_SIGNATURE_SIZE	(sizeof(struct extended_signature))
-- 
2.48.1