Hi Greg,
Le 9/08/2021 à 12:42, gregkh@linuxfoundation.org a écrit :
The patch below does not apply to the 5.13-stable tree.
I don't know when stable was cc on this patch, this fixes something introduced in 5.14-rc1, so this is not normal it can't be applied.
Sorry for the noise,
Alex
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 6d7f91d914bc90a15ebc426440c26081337ceaa1 Mon Sep 17 00:00:00 2001 From: Alexandre Ghiti alex@ghiti.fr Date: Wed, 21 Jul 2021 09:59:35 +0200 Subject: [PATCH] riscv: Get rid of CONFIG_PHYS_RAM_BASE in kernel physical address conversion
The usage of CONFIG_PHYS_RAM_BASE for all kernel types was a mistake: this value is implementation-specific and this breaks the genericity of the RISC-V kernel.
Fix this by introducing a new variable phys_ram_base that holds this value at runtime and use it in the kernel physical address conversion macro. Since this value is used only for XIP kernels, evaluate it only if CONFIG_XIP_KERNEL is set which in addition optimizes this macro for standard kernels at compile-time.
Signed-off-by: Alexandre Ghiti alex@ghiti.fr Tested-by: Emil Renner Berthing kernel@esmil.dk Reviewed-by: Jisheng Zhang jszhang@kernel.org Fixes: 44c922572952 ("RISC-V: enable XIP") Cc: stable@vger.kernel.org Signed-off-by: Palmer Dabbelt palmerdabbelt@google.com
diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h index cca8764aed83..b0ca5058e7ae 100644 --- a/arch/riscv/include/asm/page.h +++ b/arch/riscv/include/asm/page.h @@ -103,6 +103,7 @@ struct kernel_mapping { }; extern struct kernel_mapping kernel_map; +extern phys_addr_t phys_ram_base; #ifdef CONFIG_64BIT #define is_kernel_mapping(x) \ @@ -113,9 +114,9 @@ extern struct kernel_mapping kernel_map; #define linear_mapping_pa_to_va(x) ((void *)((unsigned long)(x) + kernel_map.va_pa_offset)) #define kernel_mapping_pa_to_va(y) ({ \ unsigned long _y = y; \
- (_y >= CONFIG_PHYS_RAM_BASE) ? \
(void *)((unsigned long)(_y) + kernel_map.va_kernel_pa_offset + XIP_OFFSET) : \(void *)((unsigned long)(_y) + kernel_map.va_kernel_xip_pa_offset); \
- (IS_ENABLED(CONFIG_XIP_KERNEL) && _y < phys_ram_base) ? \
(void *)((unsigned long)(_y) + kernel_map.va_kernel_xip_pa_offset) : \(void *)((unsigned long)(_y) + kernel_map.va_kernel_pa_offset + XIP_OFFSET); \diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index a14bf3910eec..88134cc288d9 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -36,6 +36,9 @@ EXPORT_SYMBOL(kernel_map); #define kernel_map (*(struct kernel_mapping *)XIP_FIXUP(&kernel_map)) #endif +phys_addr_t phys_ram_base __ro_after_init; +EXPORT_SYMBOL(phys_ram_base);
- #ifdef CONFIG_XIP_KERNEL extern char _xiprom[], _exiprom[]; #endif
@@ -160,7 +163,7 @@ static void __init setup_bootmem(void) phys_addr_t vmlinux_end = __pa_symbol(&_end); phys_addr_t vmlinux_start = __pa_symbol(&_start); phys_addr_t __maybe_unused max_mapped_addr;
- phys_addr_t dram_end;
- phys_addr_t phys_ram_end;
#ifdef CONFIG_XIP_KERNEL vmlinux_start = __pa_symbol(&_sdata); @@ -181,9 +184,12 @@ static void __init setup_bootmem(void) #endif memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
- dram_end = memblock_end_of_DRAM();
- phys_ram_end = memblock_end_of_DRAM(); #ifndef CONFIG_64BIT
+#ifndef CONFIG_XIP_KERNEL
- phys_ram_base = memblock_start_of_DRAM();
+#endif /* * memblock allocator is not aware of the fact that last 4K bytes of * the addressable memory can not be mapped because of IS_ERR_VALUE @@ -194,12 +200,12 @@ static void __init setup_bootmem(void) * be done in create_kernel_page_table. */ max_mapped_addr = __pa(~(ulong)0);
- if (max_mapped_addr == (dram_end - 1))
- if (max_mapped_addr == (phys_ram_end - 1)) memblock_set_current_limit(max_mapped_addr - 4096); #endif
- min_low_pfn = PFN_UP(memblock_start_of_DRAM());
- max_low_pfn = max_pfn = PFN_DOWN(dram_end);
- min_low_pfn = PFN_UP(phys_ram_base);
- max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end);
dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn)); set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET); @@ -558,6 +564,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa) kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR; kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom);
- phys_ram_base = CONFIG_PHYS_RAM_BASE; kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE; kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_sdata);