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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/powerpc/include/asm/fixmap.h
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@@ -15,14 +15,25 @@
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 #define _ASM_FIXMAP_H
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 #ifndef __ASSEMBLY__
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+#include <linux/sizes.h>
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+#include <linux/pgtable.h>
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 #include <asm/page.h>
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-#include <asm/pgtable.h>
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 #ifdef CONFIG_HIGHMEM
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 #include <linux/threads.h>
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 #include <asm/kmap_types.h>
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 #endif
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+#ifdef CONFIG_PPC64
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+#define FIXADDR_TOP	(IOREMAP_END + FIXADDR_SIZE)
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+#else
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+#define FIXADDR_SIZE	0
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+#ifdef CONFIG_KASAN
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+#include <asm/kasan.h>
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+#define FIXADDR_TOP	(KASAN_SHADOW_START - PAGE_SIZE)
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+#else
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 #define FIXADDR_TOP	((unsigned long)(-PAGE_SIZE))
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+#endif
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+#endif
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37
 
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 /*
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  * Here we define all the compile-time 'special' virtual
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@@ -44,9 +55,10 @@
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  */
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 enum fixed_addresses {
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 	FIX_HOLE,
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+#ifdef CONFIG_PPC32
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 	/* reserve the top 128K for early debugging purposes */
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 	FIX_EARLY_DEBUG_TOP = FIX_HOLE,
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-	FIX_EARLY_DEBUG_BASE = FIX_EARLY_DEBUG_TOP+((128*1024)/PAGE_SIZE)-1,
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+	FIX_EARLY_DEBUG_BASE = FIX_EARLY_DEBUG_TOP+(ALIGN(SZ_128K, PAGE_SIZE)/PAGE_SIZE)-1,
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 #ifdef CONFIG_HIGHMEM
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 	FIX_KMAP_BEGIN,	/* reserved pte's for temporary kernel mappings */
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 	FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
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@@ -58,22 +70,54 @@
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 	FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 +
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 		       FIX_IMMR_SIZE,
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 #endif
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+#ifdef CONFIG_PPC_83xx
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+	/* For IMMR we need an aligned 2M area */
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+#define FIX_IMMR_SIZE	(SZ_2M / PAGE_SIZE)
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+	FIX_IMMR_START,
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+	FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 +
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+		       FIX_IMMR_SIZE,
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+#endif
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 	/* FIX_PCIE_MCFG, */
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+#endif /* CONFIG_PPC32 */
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+	__end_of_permanent_fixed_addresses,
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+
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+#define NR_FIX_BTMAPS		(SZ_256K / PAGE_SIZE)
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+#define FIX_BTMAPS_SLOTS	16
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+#define TOTAL_FIX_BTMAPS	(NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
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+
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+	FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
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+	FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
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 	__end_of_fixed_addresses
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 };
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 #define __FIXADDR_SIZE	(__end_of_fixed_addresses << PAGE_SHIFT)
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 #define FIXADDR_START		(FIXADDR_TOP - __FIXADDR_SIZE)
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+#define FIXMAP_ALIGNED_SIZE	(ALIGN(FIXADDR_TOP, PGDIR_SIZE) - \
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+				 ALIGN_DOWN(FIXADDR_START, PGDIR_SIZE))
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+#define FIXMAP_PTE_SIZE	(FIXMAP_ALIGNED_SIZE / PGDIR_SIZE * PTE_TABLE_SIZE)
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+
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 #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NCG
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+#define FIXMAP_PAGE_IO	PAGE_KERNEL_NCG
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102
 
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 #include <asm-generic/fixmap.h>
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 static inline void __set_fixmap(enum fixed_addresses idx,
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 				phys_addr_t phys, pgprot_t flags)
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 {
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-	map_kernel_page(fix_to_virt(idx), phys, pgprot_val(flags));
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+	BUILD_BUG_ON(IS_ENABLED(CONFIG_PPC64) && __FIXADDR_SIZE > FIXADDR_SIZE);
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+
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+	if (__builtin_constant_p(idx))
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+		BUILD_BUG_ON(idx >= __end_of_fixed_addresses);
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+	else if (WARN_ON(idx >= __end_of_fixed_addresses))
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+		return;
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+	if (pgprot_val(flags))
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+		map_kernel_page(__fix_to_virt(idx), phys, flags);
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+	else
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+		unmap_kernel_page(__fix_to_virt(idx));
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 }
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+#define __early_set_fixmap	__set_fixmap
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+
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 #endif /* !__ASSEMBLY__ */
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 #endif