Commit 77e4ca2f authored by Jiaxun Yang's avatar Jiaxun Yang Committed by Zheng Zengkai
Browse files

MIPS: Loongson64: Enable DMA noncoherent support 

stable inclusion
from stable-v6.6.7
commit 1eed445d53640d614efc7c37c9b354bd6f471cd3
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8SSQ4

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=1eed445d53640d614efc7c37c9b354bd6f471cd3



--------------------------------

commit edc0378eee00200a5bedf1bb9f00ad390e0d1bd4 upstream.

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@vger.kernel.org
Fixes: 71e2f4dd ("MIPS: Fork loongson2ef from loongson64")
Signed-off-by: default avatarJiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: default avatarThomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent 69ced6d7

arch/mips/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -482,6 +482,7 @@ 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
@@ -1273,6 +1274,7 @@ 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

arch/mips/include/asm/mach-loongson64/boot_param.h

+2 −1
Original line number Diff line number Diff line
@@ -121,7 +121,8 @@ 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 {

arch/mips/loongson64/env.c

+9 −1
Original line number Diff line number Diff line
@@ -13,6 +13,8 @@ 
 * Copyright (C) 2009 Lemote Inc.

 * Author: Wu Zhangjin, wuzhangjin@gmail.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;