linux-kernel - [PATCH fixes v2 2/3] MIPS: Loongson64: Enable DMA noncoherent support

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Message-Id: <20231107-loongson64_fixes-v2-2-5c49ceed7950@flygoat.com>
Date:   Tue, 07 Nov 2023 11:15:19 +0000
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     Huacai Chen <chenhuacai@...nel.org>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, Sergey Shtylyov <s.shtylyov@....ru>,
        Jiaxun Yang <jiaxun.yang@...goat.com>, stable@...r.kernel.org
Subject: [PATCH fixes v2 2/3] MIPS: Loongson64: Enable DMA noncoherent
 support

There are some Loongson64 systems come with broken coherent DMA
support, firmware will set a bit in boot_param and pass nocoherentio
in cmdline.

However nonconherent support was missed out when spin off Loongson-2EF
form Loongson64, and that boot_param change never made itself into
upstream.

Support DMA noncoherent properly to get those systems working.

Cc: stable@...r.kernel.org
Fixes: 71e2f4dd5a65 ("MIPS: Fork loongson2ef from loongson64")
Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
v2: Style fixes
---
 arch/mips/Kconfig                                  |  2 ++
 arch/mips/include/asm/mach-loongson64/boot_param.h |  3 ++-
 arch/mips/loongson64/env.c                         | 10 +++++++++-
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 76db82542519..797ae590ebdb 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -460,6 +460,7 @@ config MACH_LOONGSON2EF
 
 config MACH_LOONGSON64
 	bool "Loongson 64-bit family of machines"
+	select ARCH_DMA_DEFAULT_COHERENT
 	select ARCH_SPARSEMEM_ENABLE
 	select ARCH_MIGHT_HAVE_PC_PARPORT
 	select ARCH_MIGHT_HAVE_PC_SERIO
@@ -1251,6 +1252,7 @@ config CPU_LOONGSON64
 	select CPU_SUPPORTS_MSA
 	select CPU_DIEI_BROKEN if !LOONGSON3_ENHANCEMENT
 	select CPU_MIPSR2_IRQ_VI
+	select DMA_NONCOHERENT
 	select WEAK_ORDERING
 	select WEAK_REORDERING_BEYOND_LLSC
 	select MIPS_ASID_BITS_VARIABLE
diff --git a/arch/mips/include/asm/mach-loongson64/boot_param.h b/arch/mips/include/asm/mach-loongson64/boot_param.h
index 035b1a69e2d0..c454ef734c45 100644
--- a/arch/mips/include/asm/mach-loongson64/boot_param.h
+++ b/arch/mips/include/asm/mach-loongson64/boot_param.h
@@ -117,7 +117,8 @@ struct irq_source_routing_table {
 	u64 pci_io_start_addr;
 	u64 pci_io_end_addr;
 	u64 pci_config_addr;
-	u32 dma_mask_bits;
+	u16 dma_mask_bits;
+	u16 dma_noncoherent;
 } __packed;
 
 struct interface_info {
diff --git a/arch/mips/loongson64/env.c b/arch/mips/loongson64/env.c
index c961e2999f15..ef3750a6ffac 100644
--- a/arch/mips/loongson64/env.c
+++ b/arch/mips/loongson64/env.c
@@ -13,6 +13,8 @@
  * Copyright (C) 2009 Lemote Inc.
  * Author: Wu Zhangjin, wuzhangjin@...il.com
  */
+
+#include <linux/dma-map-ops.h>
 #include <linux/export.h>
 #include <linux/pci_ids.h>
 #include <asm/bootinfo.h>
@@ -147,8 +149,14 @@ void __init prom_lefi_init_env(void)
 
 	loongson_sysconf.dma_mask_bits = eirq_source->dma_mask_bits;
 	if (loongson_sysconf.dma_mask_bits < 32 ||
-		loongson_sysconf.dma_mask_bits > 64)
+			loongson_sysconf.dma_mask_bits > 64) {
 		loongson_sysconf.dma_mask_bits = 32;
+		dma_default_coherent = true;
+	} else {
+		dma_default_coherent = !eirq_source->dma_noncoherent;
+	}
+
+	pr_info("Firmware: Coherent DMA: %s\n", dma_default_coherent ? "on" : "off");
 
 	loongson_sysconf.restart_addr = boot_p->reset_system.ResetWarm;
 	loongson_sysconf.poweroff_addr = boot_p->reset_system.Shutdown;

-- 
2.34.1