Commit 6d7f91d9 authored by Alexandre Ghiti's avatar Alexandre Ghiti Committed by Palmer Dabbelt

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: default avatarAlexandre Ghiti <alex@ghiti.fr>
Tested-by: default avatarEmil Renner Berthing <kernel@esmil.dk>
Reviewed-by: default avatarJisheng Zhang <jszhang@kernel.org>
Fixes: 44c92257 ("RISC-V: enable XIP")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
parent a18b14d8
...@@ -103,6 +103,7 @@ struct kernel_mapping { ...@@ -103,6 +103,7 @@ struct kernel_mapping {
}; };
extern struct kernel_mapping kernel_map; extern struct kernel_mapping kernel_map;
extern phys_addr_t phys_ram_base;
#ifdef CONFIG_64BIT #ifdef CONFIG_64BIT
#define is_kernel_mapping(x) \ #define is_kernel_mapping(x) \
...@@ -113,9 +114,9 @@ extern struct kernel_mapping kernel_map; ...@@ -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 linear_mapping_pa_to_va(x) ((void *)((unsigned long)(x) + kernel_map.va_pa_offset))
#define kernel_mapping_pa_to_va(y) ({ \ #define kernel_mapping_pa_to_va(y) ({ \
unsigned long _y = y; \ unsigned long _y = y; \
(_y >= CONFIG_PHYS_RAM_BASE) ? \ (IS_ENABLED(CONFIG_XIP_KERNEL) && _y < 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) : \
(void *)((unsigned long)(_y) + kernel_map.va_kernel_xip_pa_offset); \ (void *)((unsigned long)(_y) + kernel_map.va_kernel_pa_offset + XIP_OFFSET); \
}) })
#define __pa_to_va_nodebug(x) linear_mapping_pa_to_va(x) #define __pa_to_va_nodebug(x) linear_mapping_pa_to_va(x)
......
...@@ -36,6 +36,9 @@ EXPORT_SYMBOL(kernel_map); ...@@ -36,6 +36,9 @@ EXPORT_SYMBOL(kernel_map);
#define kernel_map (*(struct kernel_mapping *)XIP_FIXUP(&kernel_map)) #define kernel_map (*(struct kernel_mapping *)XIP_FIXUP(&kernel_map))
#endif #endif
phys_addr_t phys_ram_base __ro_after_init;
EXPORT_SYMBOL(phys_ram_base);
#ifdef CONFIG_XIP_KERNEL #ifdef CONFIG_XIP_KERNEL
extern char _xiprom[], _exiprom[]; extern char _xiprom[], _exiprom[];
#endif #endif
...@@ -160,7 +163,7 @@ static void __init setup_bootmem(void) ...@@ -160,7 +163,7 @@ static void __init setup_bootmem(void)
phys_addr_t vmlinux_end = __pa_symbol(&_end); phys_addr_t vmlinux_end = __pa_symbol(&_end);
phys_addr_t vmlinux_start = __pa_symbol(&_start); phys_addr_t vmlinux_start = __pa_symbol(&_start);
phys_addr_t __maybe_unused max_mapped_addr; phys_addr_t __maybe_unused max_mapped_addr;
phys_addr_t dram_end; phys_addr_t phys_ram_end;
#ifdef CONFIG_XIP_KERNEL #ifdef CONFIG_XIP_KERNEL
vmlinux_start = __pa_symbol(&_sdata); vmlinux_start = __pa_symbol(&_sdata);
...@@ -181,9 +184,12 @@ static void __init setup_bootmem(void) ...@@ -181,9 +184,12 @@ static void __init setup_bootmem(void)
#endif #endif
memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); 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_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 * 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 * the addressable memory can not be mapped because of IS_ERR_VALUE
...@@ -194,12 +200,12 @@ static void __init setup_bootmem(void) ...@@ -194,12 +200,12 @@ static void __init setup_bootmem(void)
* be done in create_kernel_page_table. * be done in create_kernel_page_table.
*/ */
max_mapped_addr = __pa(~(ulong)0); 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); memblock_set_current_limit(max_mapped_addr - 4096);
#endif #endif
min_low_pfn = PFN_UP(memblock_start_of_DRAM()); min_low_pfn = PFN_UP(phys_ram_base);
max_low_pfn = max_pfn = PFN_DOWN(dram_end); max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end);
dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn)); dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET); set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
...@@ -558,6 +564,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa) ...@@ -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 = (uintptr_t)CONFIG_XIP_PHYS_ADDR;
kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom); 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.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE;
kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_sdata); kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_sdata);
......
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