linux-kernel - [PATCH] riscv: mm: update T-Head memory type definitions

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Message-Id: <20230827090644.1318-1-jszhang@kernel.org>
Date:   Sun, 27 Aug 2023 17:06:44 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>, Guo Ren <guoren@...nel.org>
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] riscv: mm: update T-Head memory type definitions

Update T-Head memory type definitions according to C910 doc [1]
For NC and IO, SH property isn't configurable, hardcoded as SH,
so set SH for NOCACHE and IO.

And also set bit[61](Bufferable) for NOCACHE according to the
table 6.1 in the doc [1].

Link: https://github.com/T-head-Semi/openc910 [1]
Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
 arch/riscv/include/asm/pgtable-64.h | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/pgtable-64.h
index 7a5097202e15..9a2c780a11e9 100644
--- a/arch/riscv/include/asm/pgtable-64.h
+++ b/arch/riscv/include/asm/pgtable-64.h
@@ -126,14 +126,18 @@ enum napot_cont_order {
 
 /*
  * [63:59] T-Head Memory Type definitions:
- *
- * 00000 - NC   Weakly-ordered, Non-cacheable, Non-bufferable, Non-shareable, Non-trustable
+ * bit[63] SO - Strong Order
+ * bit[62] C - Cacheable
+ * bit[61] B - Bufferable
+ * bit[60] SH - Shareable
+ * bit[59] Sec - Trustable
+ * 00110 - NC   Weakly-ordered, Non-cacheable, Bufferable, Shareable, Non-trustable
  * 01110 - PMA  Weakly-ordered, Cacheable, Bufferable, Shareable, Non-trustable
- * 10000 - IO   Strongly-ordered, Non-cacheable, Non-bufferable, Non-shareable, Non-trustable
+ * 10010 - IO   Strongly-ordered, Non-cacheable, Non-bufferable, Shareable, Non-trustable
  */
 #define _PAGE_PMA_THEAD		((1UL << 62) | (1UL << 61) | (1UL << 60))
-#define _PAGE_NOCACHE_THEAD	0UL
-#define _PAGE_IO_THEAD		(1UL << 63)
+#define _PAGE_NOCACHE_THEAD	((1UL < 61) | (1UL << 60))
+#define _PAGE_IO_THEAD		((1UL << 63) | (1UL << 60))
 #define _PAGE_MTMASK_THEAD	(_PAGE_PMA_THEAD | _PAGE_IO_THEAD | (1UL << 59))
 
 static inline u64 riscv_page_mtmask(void)
-- 
2.40.1