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author | Icenowy Zheng <uwu@icenowy.me> | 2023-10-18 03:42:52 +0300 |
---|---|---|
committer | Huacai Chen <chenhuacai@loongson.cn> | 2023-10-18 03:42:52 +0300 |
commit | 278be83601dd1725d4732241f066d528e160a39d (patch) | |
tree | 0027aaff07b4329c0186f6bbacc429fd636499e3 /arch/loongarch/kernel | |
parent | 477a0ebec101359f49d92796e3b609857d564b52 (diff) | |
download | linux-278be83601dd1725d4732241f066d528e160a39d.tar.xz |
LoongArch: Disable WUC for pgprot_writecombine() like ioremap_wc()
Currently the code disables WUC only disables it for ioremap_wc(), which
is only used when mapping writecombine pages like ioremap() (mapped to
the kernel space). But for VRAM mapped in TTM/GEM, it is mapped with a
crafted pgprot by the pgprot_writecombine() function, in which case WUC
isn't disabled now.
Disable WUC for pgprot_writecombine() (fallback to SUC) if needed, like
ioremap_wc().
This improves the AMDGPU driver's stability (solves some misrendering)
on Loongson-3A5000/3A6000 machines.
Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/kernel')
-rw-r--r-- | arch/loongarch/kernel/setup.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c index 7783f0a3d742..aed65915e932 100644 --- a/arch/loongarch/kernel/setup.c +++ b/arch/loongarch/kernel/setup.c @@ -161,19 +161,19 @@ static void __init smbios_parse(void) } #ifdef CONFIG_ARCH_WRITECOMBINE -pgprot_t pgprot_wc = PAGE_KERNEL_WUC; +bool wc_enabled = true; #else -pgprot_t pgprot_wc = PAGE_KERNEL_SUC; +bool wc_enabled = false; #endif -EXPORT_SYMBOL(pgprot_wc); +EXPORT_SYMBOL(wc_enabled); static int __init setup_writecombine(char *p) { if (!strcmp(p, "on")) - pgprot_wc = PAGE_KERNEL_WUC; + wc_enabled = true; else if (!strcmp(p, "off")) - pgprot_wc = PAGE_KERNEL_SUC; + wc_enabled = false; else pr_warn("Unknown writecombine setting \"%s\".\n", p); |