From 6778948f9de86c3cfaf36725a7c87dcff9ba247f Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 11 Dec 2023 08:20:59 +0000
Subject: [PATCH] kernel_5.10 no rt
---
kernel/arch/powerpc/include/asm/book3s/64/hash.h | 104 ++++++++++++++++++++++++++++++++++++++--------------
1 files changed, 76 insertions(+), 28 deletions(-)
diff --git a/kernel/arch/powerpc/include/asm/book3s/64/hash.h b/kernel/arch/powerpc/include/asm/book3s/64/hash.h
index d52a51b..73ad038 100644
--- a/kernel/arch/powerpc/include/asm/book3s/64/hash.h
+++ b/kernel/arch/powerpc/include/asm/book3s/64/hash.h
@@ -18,12 +18,21 @@
#include <asm/book3s/64/hash-4k.h>
#endif
+/* Bits to set in a PMD/PUD/PGD entry valid bit*/
+#define HASH_PMD_VAL_BITS (0x8000000000000000UL)
+#define HASH_PUD_VAL_BITS (0x8000000000000000UL)
+#define HASH_PGD_VAL_BITS (0x8000000000000000UL)
+
/*
* Size of EA range mapped by our pagetables.
*/
#define H_PGTABLE_EADDR_SIZE (H_PTE_INDEX_SIZE + H_PMD_INDEX_SIZE + \
H_PUD_INDEX_SIZE + H_PGD_INDEX_SIZE + PAGE_SHIFT)
#define H_PGTABLE_RANGE (ASM_CONST(1) << H_PGTABLE_EADDR_SIZE)
+/*
+ * Top 2 bits are ignored in page table walk.
+ */
+#define EA_MASK (~(0xcUL << 60))
/*
* We store the slot details in the second half of page table.
@@ -35,46 +44,65 @@
#else
#define H_PUD_CACHE_INDEX (H_PUD_INDEX_SIZE)
#endif
-/*
- * Define the address range of the kernel non-linear virtual area
- */
-#define H_KERN_VIRT_START ASM_CONST(0xD000000000000000)
-#define H_KERN_VIRT_SIZE ASM_CONST(0x0000400000000000) /* 64T */
/*
- * The vmalloc space starts at the beginning of that region, and
- * occupies half of it on hash CPUs and a quarter of it on Book3E
- * (we keep a quarter for the virtual memmap)
+ * +------------------------------+
+ * | |
+ * | |
+ * | |
+ * +------------------------------+ Kernel virtual map end (0xc00e000000000000)
+ * | |
+ * | |
+ * | 512TB/16TB of vmemmap |
+ * | |
+ * | |
+ * +------------------------------+ Kernel vmemmap start
+ * | |
+ * | 512TB/16TB of IO map |
+ * | |
+ * +------------------------------+ Kernel IO map start
+ * | |
+ * | 512TB/16TB of vmap |
+ * | |
+ * +------------------------------+ Kernel virt start (0xc008000000000000)
+ * | |
+ * | |
+ * | |
+ * +------------------------------+ Kernel linear (0xc.....)
*/
-#define H_VMALLOC_START H_KERN_VIRT_START
-#define H_VMALLOC_SIZE ASM_CONST(0x380000000000) /* 56T */
-#define H_VMALLOC_END (H_VMALLOC_START + H_VMALLOC_SIZE)
-#define H_KERN_IO_START H_VMALLOC_END
+#define H_VMALLOC_START H_KERN_VIRT_START
+#define H_VMALLOC_SIZE H_KERN_MAP_SIZE
+#define H_VMALLOC_END (H_VMALLOC_START + H_VMALLOC_SIZE)
+
+#define H_KERN_IO_START H_VMALLOC_END
+#define H_KERN_IO_SIZE H_KERN_MAP_SIZE
+#define H_KERN_IO_END (H_KERN_IO_START + H_KERN_IO_SIZE)
+
+#define H_VMEMMAP_START H_KERN_IO_END
+#define H_VMEMMAP_SIZE H_KERN_MAP_SIZE
+#define H_VMEMMAP_END (H_VMEMMAP_START + H_VMEMMAP_SIZE)
+
+#define NON_LINEAR_REGION_ID(ea) ((((unsigned long)ea - H_KERN_VIRT_START) >> REGION_SHIFT) + 2)
/*
* Region IDs
*/
-#define REGION_SHIFT 60UL
-#define REGION_MASK (0xfUL << REGION_SHIFT)
-#define REGION_ID(ea) (((unsigned long)(ea)) >> REGION_SHIFT)
-
-#define VMALLOC_REGION_ID (REGION_ID(H_VMALLOC_START))
-#define KERNEL_REGION_ID (REGION_ID(PAGE_OFFSET))
-#define VMEMMAP_REGION_ID (0xfUL) /* Server only */
-#define USER_REGION_ID (0UL)
+#define USER_REGION_ID 0
+#define LINEAR_MAP_REGION_ID 1
+#define VMALLOC_REGION_ID NON_LINEAR_REGION_ID(H_VMALLOC_START)
+#define IO_REGION_ID NON_LINEAR_REGION_ID(H_KERN_IO_START)
+#define VMEMMAP_REGION_ID NON_LINEAR_REGION_ID(H_VMEMMAP_START)
+#define INVALID_REGION_ID (VMEMMAP_REGION_ID + 1)
/*
* Defines the address of the vmemap area, in its own region on
* hash table CPUs.
*/
-#define H_VMEMMAP_BASE (VMEMMAP_REGION_ID << REGION_SHIFT)
-
#ifdef CONFIG_PPC_MM_SLICES
#define HAVE_ARCH_UNMAPPED_AREA
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
#endif /* CONFIG_PPC_MM_SLICES */
-
/* PTEIDX nibble */
#define _PTEIDX_SECONDARY 0x8
@@ -84,11 +112,31 @@
#define H_PUD_BAD_BITS (PMD_TABLE_SIZE-1)
#ifndef __ASSEMBLY__
+static inline int get_region_id(unsigned long ea)
+{
+ int region_id;
+ int id = (ea >> 60UL);
+
+ if (id == 0)
+ return USER_REGION_ID;
+
+ if (id != (PAGE_OFFSET >> 60))
+ return INVALID_REGION_ID;
+
+ if (ea < H_KERN_VIRT_START)
+ return LINEAR_MAP_REGION_ID;
+
+ BUILD_BUG_ON(NON_LINEAR_REGION_ID(H_VMALLOC_START) != 2);
+
+ region_id = NON_LINEAR_REGION_ID(ea);
+ return region_id;
+}
+
#define hash__pmd_bad(pmd) (pmd_val(pmd) & H_PMD_BAD_BITS)
#define hash__pud_bad(pud) (pud_val(pud) & H_PUD_BAD_BITS)
-static inline int hash__pgd_bad(pgd_t pgd)
+static inline int hash__p4d_bad(p4d_t p4d)
{
- return (pgd_val(pgd) == 0);
+ return (p4d_val(p4d) == 0);
}
#ifdef CONFIG_STRICT_KERNEL_RWX
extern void hash__mark_rodata_ro(void);
@@ -196,15 +244,15 @@
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-extern int hash__map_kernel_page(unsigned long ea, unsigned long pa,
- unsigned long flags);
+int hash__map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot);
extern int __meminit hash__vmemmap_create_mapping(unsigned long start,
unsigned long page_size,
unsigned long phys);
extern void hash__vmemmap_remove_mapping(unsigned long start,
unsigned long page_size);
-int hash__create_section_mapping(unsigned long start, unsigned long end, int nid);
+int hash__create_section_mapping(unsigned long start, unsigned long end,
+ int nid, pgprot_t prot);
int hash__remove_section_mapping(unsigned long start, unsigned long end);
#endif /* !__ASSEMBLY__ */
--
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