linux-kernel - [PATCH v4 2/2] riscv: errata: thead: use pa based instructions for CMO

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Date:   Thu, 12 Oct 2023 22:37:46 +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>
Cc:     Guo Ren <guoren@...nel.org>, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 2/2] riscv: errata: thead: use pa based instructions for CMO

T-HEAD CPUs such as C906/C910/C920 support phy address based CMO, use
them so that we don't need to convert to virt address.

Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
Reviewed-by: Guo Ren <guoren@...nel.org>
---
 arch/riscv/errata/thead/errata.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/arch/riscv/errata/thead/errata.c b/arch/riscv/errata/thead/errata.c
index 3fefeb1b456e..632557f36b19 100644
--- a/arch/riscv/errata/thead/errata.c
+++ b/arch/riscv/errata/thead/errata.c
@@ -58,9 +58,9 @@ static bool errata_probe_pbmt(unsigned int stage,
  * | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 |
  *   0000000    11001     00000      000      00000  0001011
  */
-#define THEAD_inval_A0	".long 0x0265000b"
-#define THEAD_clean_A0	".long 0x0255000b"
-#define THEAD_flush_A0	".long 0x0275000b"
+#define THEAD_inval_A0	".long 0x02a5000b"
+#define THEAD_clean_A0	".long 0x0295000b"
+#define THEAD_flush_A0	".long 0x02b5000b"
 #define THEAD_SYNC_S	".long 0x0190000b"
 
 #define THEAD_CMO_OP(_op, _start, _size, _cachesize)			\
@@ -79,23 +79,17 @@ asm volatile("mv a0, %1\n\t"						\
 
 static void thead_errata_cache_inv(phys_addr_t paddr, size_t size)
 {
-	void *vaddr = phys_to_virt(paddr);
-
-	THEAD_CMO_OP(inval, vaddr, size, riscv_cbom_block_size);
+	THEAD_CMO_OP(inval, paddr, size, riscv_cbom_block_size);
 }
 
 static void thead_errata_cache_wback(phys_addr_t paddr, size_t size)
 {
-	void *vaddr = phys_to_virt(paddr);
-
-	THEAD_CMO_OP(clean, vaddr, size, riscv_cbom_block_size);
+	THEAD_CMO_OP(clean, paddr, size, riscv_cbom_block_size);
 }
 
 static void thead_errata_cache_wback_inv(phys_addr_t paddr, size_t size)
 {
-	void *vaddr = phys_to_virt(paddr);
-
-	THEAD_CMO_OP(flush, vaddr, size, riscv_cbom_block_size);
+	THEAD_CMO_OP(flush, paddr, size, riscv_cbom_block_size);
 }
 
 static const struct riscv_nonstd_cache_ops thead_errata_cmo_ops = {
-- 
2.40.1