riscv: Simplify xip and !xip kernel address conversion macros

To simplify the kernel address conversion code, make the same definition of
kernel_mapping_pa_to_va and kernel_mapping_va_to_pa compatible for both xip
and !xip kernel by defining XIP_OFFSET to 0 in !xip kernel.

Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

Author: AlexGhiti

arch/riscv/include/asm/page.h

@@ -93,46 +93,38 @@ extern unsigned long va_pa_offset;
 #ifdef CONFIG_64BIT
 extern unsigned long va_kernel_pa_offset;
 #endif
-#ifdef CONFIG_XIP_KERNEL
 extern unsigned long va_kernel_xip_pa_offset;
-#endif
 extern unsigned long pfn_base;
 #define ARCH_PFN_OFFSET		(pfn_base)
 #else
 #define va_pa_offset		0
 #ifdef CONFIG_64BIT
 #define va_kernel_pa_offset	0
 #endif
+#define va_kernel_xip_pa_offset 0
 #define ARCH_PFN_OFFSET		(PAGE_OFFSET >> PAGE_SHIFT)
 #endif /* CONFIG_MMU */
 
 extern unsigned long kernel_virt_addr;
 
 #ifdef CONFIG_64BIT
 #define linear_mapping_pa_to_va(x)	((void *)((unsigned long)(x) + va_pa_offset))
-#ifdef CONFIG_XIP_KERNEL
 #define kernel_mapping_pa_to_va(y)	({						\
 	unsigned long _y = y;								\
 	(_y >= CONFIG_PHYS_RAM_BASE) ?							\
 		(void *)((unsigned long)(_y) + va_kernel_pa_offset + XIP_OFFSET) :	\
 		(void *)((unsigned long)(_y) + va_kernel_xip_pa_offset);		\
 	})
-#else
-#define kernel_mapping_pa_to_va(x)	((void *)((unsigned long)(x) + va_kernel_pa_offset))
-#endif
 #define __pa_to_va_nodebug(x)		linear_mapping_pa_to_va(x)
 
 #define linear_mapping_va_to_pa(x)	((unsigned long)(x) - va_pa_offset)
-#ifdef CONFIG_XIP_KERNEL
 #define kernel_mapping_va_to_pa(y) ({						\
 	unsigned long _y = y;							\
 	(_y < kernel_virt_addr + XIP_OFFSET) ?					\
 		((unsigned long)(_y) - va_kernel_xip_pa_offset) :		\
 		((unsigned long)(_y) - va_kernel_pa_offset - XIP_OFFSET);	\
 	})
-#else
-#define kernel_mapping_va_to_pa(x)	((unsigned long)(x) - va_kernel_pa_offset)
-#endif
+
 #define __va_to_pa_nodebug(x)	({						\
 	unsigned long _x = x;							\
 	(_x < kernel_virt_addr) ?						\
@@ -141,7 +133,7 @@ extern unsigned long kernel_virt_addr;
 #else
 #define __pa_to_va_nodebug(x)  ((void *)((unsigned long) (x) + va_pa_offset))
 #define __va_to_pa_nodebug(x)  ((unsigned long)(x) - va_pa_offset)
-#endif
+#endif /* CONFIG_64BIT */
 
 #ifdef CONFIG_DEBUG_VIRTUAL
 extern phys_addr_t __virt_to_phys(unsigned long x);

arch/riscv/include/asm/pgtable.h

@@ -77,6 +77,8 @@
 
 #ifdef CONFIG_XIP_KERNEL
 #define XIP_OFFSET		SZ_8M
+#else
+#define XIP_OFFSET		0
 #endif
 
 #ifndef __ASSEMBLY__