linux-kernel - [PATCH 1/2] riscv: thead: Rename T-Head PBMT to MAEE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20240327103130.3651950-2-christoph.muellner@vrull.eu>
Date: Wed, 27 Mar 2024 11:31:29 +0100
From: Christoph Müllner <christoph.muellner@...ll.eu>
To: linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Palmer Dabbelt <palmer@...belt.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Philipp Tomsich <philipp.tomsich@...ll.eu>,
	Björn Töpel <bjorn@...nel.org>,
	Daniel Henrique Barboza <dbarboza@...tanamicro.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Cooper Qu <cooper.qu@...ux.alibaba.com>,
	Zhiwei Liu <zhiwei_liu@...ux.alibaba.com>,
	Huang Tao <eric.huang@...ux.alibaba.com>,
	Alistair Francis <alistair.francis@....com>,
	Andrew Jones <ajones@...tanamicro.com>,
	Conor Dooley <conor@...nel.org>
Cc: Christoph Müllner <christoph.muellner@...ll.eu>
Subject: [PATCH 1/2] riscv: thead: Rename T-Head PBMT to MAEE

T-Head's vendor extension to set page attributes has the name
MAEE (MMU address attribute extension).
Let's rename it, so it is clear what this referes to.

See also:
  https://github.com/T-head-Semi/thead-extension-spec/blob/master/xtheadmaee.adoc

Signed-off-by: Christoph Müllner <christoph.muellner@...ll.eu>
---
 arch/riscv/Kconfig.errata            |  8 ++++----
 arch/riscv/errata/thead/errata.c     |  8 ++++----
 arch/riscv/include/asm/errata_list.h | 20 ++++++++++----------
 3 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/arch/riscv/Kconfig.errata b/arch/riscv/Kconfig.errata
index 910ba8837add..2c24bef7e112 100644
--- a/arch/riscv/Kconfig.errata
+++ b/arch/riscv/Kconfig.errata
@@ -82,14 +82,14 @@ config ERRATA_THEAD
 
 	  Otherwise, please say "N" here to avoid unnecessary overhead.
 
-config ERRATA_THEAD_PBMT
-	bool "Apply T-Head memory type errata"
+config ERRATA_THEAD_MAEE
+	bool "Apply T-Head's MMU address attribute (MAEE)"
 	depends on ERRATA_THEAD && 64BIT && MMU
 	select RISCV_ALTERNATIVE_EARLY
 	default y
 	help
-	  This will apply the memory type errata to handle the non-standard
-	  memory type bits in page-table-entries on T-Head SoCs.
+	  This will apply the memory type errata to handle T-Head's MMU address
+	  attribute extension (MAEE).
 
 	  If you don't know what to do here, say "Y".
 
diff --git a/arch/riscv/errata/thead/errata.c b/arch/riscv/errata/thead/errata.c
index b1c410bbc1ae..8c8a8a4b0421 100644
--- a/arch/riscv/errata/thead/errata.c
+++ b/arch/riscv/errata/thead/errata.c
@@ -19,10 +19,10 @@
 #include <asm/patch.h>
 #include <asm/vendorid_list.h>
 
-static bool errata_probe_pbmt(unsigned int stage,
+static bool errata_probe_maee(unsigned int stage,
 			      unsigned long arch_id, unsigned long impid)
 {
-	if (!IS_ENABLED(CONFIG_ERRATA_THEAD_PBMT))
+	if (!IS_ENABLED(CONFIG_ERRATA_THEAD_MAEE))
 		return false;
 
 	if (arch_id != 0 || impid != 0)
@@ -140,8 +140,8 @@ static u32 thead_errata_probe(unsigned int stage,
 {
 	u32 cpu_req_errata = 0;
 
-	if (errata_probe_pbmt(stage, archid, impid))
-		cpu_req_errata |= BIT(ERRATA_THEAD_PBMT);
+	if (errata_probe_maee(stage, archid, impid))
+		cpu_req_errata |= BIT(ERRATA_THEAD_MAEE);
 
 	errata_probe_cmo(stage, archid, impid);
 
diff --git a/arch/riscv/include/asm/errata_list.h b/arch/riscv/include/asm/errata_list.h
index ea33288f8a25..7c377e137b41 100644
--- a/arch/riscv/include/asm/errata_list.h
+++ b/arch/riscv/include/asm/errata_list.h
@@ -23,7 +23,7 @@
 #endif
 
 #ifdef CONFIG_ERRATA_THEAD
-#define	ERRATA_THEAD_PBMT 0
+#define	ERRATA_THEAD_MAEE 0
 #define	ERRATA_THEAD_PMU 1
 #define	ERRATA_THEAD_NUMBER 2
 #endif
@@ -53,20 +53,20 @@ asm(ALTERNATIVE("sfence.vma %0", "sfence.vma", SIFIVE_VENDOR_ID,	\
  * in the default case.
  */
 #define ALT_SVPBMT_SHIFT 61
-#define ALT_THEAD_PBMT_SHIFT 59
+#define ALT_THEAD_MAEE_SHIFT 59
 #define ALT_SVPBMT(_val, prot)						\
 asm(ALTERNATIVE_2("li %0, 0\t\nnop",					\
 		  "li %0, %1\t\nslli %0,%0,%3", 0,			\
 			RISCV_ISA_EXT_SVPBMT, CONFIG_RISCV_ISA_SVPBMT,	\
 		  "li %0, %2\t\nslli %0,%0,%4", THEAD_VENDOR_ID,	\
-			ERRATA_THEAD_PBMT, CONFIG_ERRATA_THEAD_PBMT)	\
+			ERRATA_THEAD_MAEE, CONFIG_ERRATA_THEAD_MAEE)	\
 		: "=r"(_val)						\
 		: "I"(prot##_SVPBMT >> ALT_SVPBMT_SHIFT),		\
-		  "I"(prot##_THEAD >> ALT_THEAD_PBMT_SHIFT),		\
+		  "I"(prot##_THEAD >> ALT_THEAD_MAEE_SHIFT),		\
 		  "I"(ALT_SVPBMT_SHIFT),				\
-		  "I"(ALT_THEAD_PBMT_SHIFT))
+		  "I"(ALT_THEAD_MAEE_SHIFT))
 
-#ifdef CONFIG_ERRATA_THEAD_PBMT
+#ifdef CONFIG_ERRATA_THEAD_MAEE
 /*
  * IO/NOCACHE memory types are handled together with svpbmt,
  * so on T-Head chips, check if no other memory type is set,
@@ -83,11 +83,11 @@ asm volatile(ALTERNATIVE(						\
 	"slli    t3, t3, %3\n\t"					\
 	"or      %0, %0, t3\n\t"					\
 	"2:",  THEAD_VENDOR_ID,						\
-		ERRATA_THEAD_PBMT, CONFIG_ERRATA_THEAD_PBMT)		\
+		ERRATA_THEAD_MAEE, CONFIG_ERRATA_THEAD_MAEE)		\
 	: "+r"(_val)							\
-	: "I"(_PAGE_MTMASK_THEAD >> ALT_THEAD_PBMT_SHIFT),		\
-	  "I"(_PAGE_PMA_THEAD >> ALT_THEAD_PBMT_SHIFT),			\
-	  "I"(ALT_THEAD_PBMT_SHIFT)					\
+	: "I"(_PAGE_MTMASK_THEAD >> ALT_THEAD_MAEE_SHIFT),		\
+	  "I"(_PAGE_PMA_THEAD >> ALT_THEAD_MAEE_SHIFT),			\
+	  "I"(ALT_THEAD_MAEE_SHIFT)					\
 	: "t3")
 #else
 #define ALT_THEAD_PMA(_val)
-- 
2.44.0