[PATCH v4 0/8] Update hash MMU kernel mapping to be in sync with radix

[PATCH v4 0/8] Update hash MMU kernel mapping to be in sync with radix

[Aneesh Kumar K.V]

This patch series map all the kernel regions (vmalloc, IO and vmemmap) using
0xc top nibble address. This brings hash translation kernel mapping in sync with radix.
Each of these regions can now map 512TB. We use one context to map these
regions and hence the 512TB limit. We also update radix to use the same limit even though
we don't have context related restrictions there.

With this we have for 4K

 kernel vmalloc start   = 0xc008000000000000
 kernel IO start        = 0xc008100000000000
 kernel vmemmap start   = 0xc008200000000000

64K hash, 64K radix and 4k radix:

  kernel vmalloc start   = 0xc008000000000000
  kernel IO start        = 0xc00a000000000000
  kernel vmemmap start   = 0xc00c000000000000


Changes from v3:
* Make 4k page size hash translation vmalloc start address to be
  same as hash 64k and radix.

Aneesh Kumar K.V (8):
  powerpc/mm/hash64: Add a variable to track the end of IO mapping
  powerpc/mm/hash64: Map all the kernel regions in the same 0xc range
  powerpc/mm: Validate address values against different region limits
  powerpc/mm: Drop the unnecessary region check
  powerpc/mm/hash: Simplify the region id calculation.
  powerpc/mm: Print kernel map details to dmesg
  powerpc/mm/hash: Rename KERNEL_REGION_ID to LINEAR_MAP_REGION_ID
  powerpc/mm/hash/4K: Update the vmalloc start for hash 4K config

 arch/powerpc/include/asm/book3s/64/hash-4k.h  | 21 ++++
 arch/powerpc/include/asm/book3s/64/hash-64k.h | 12 +++
 arch/powerpc/include/asm/book3s/64/hash.h     | 95 ++++++++++++-------
 arch/powerpc/include/asm/book3s/64/mmu-hash.h | 42 ++++----
 arch/powerpc/include/asm/book3s/64/mmu.h      |  9 +-
 arch/powerpc/include/asm/book3s/64/pgtable.h  |  9 +-
 arch/powerpc/include/asm/book3s/64/radix.h    | 40 ++++----
 arch/powerpc/include/asm/page.h               | 11 ---
 arch/powerpc/kernel/setup-common.c            |  3 +
 arch/powerpc/kvm/book3s_hv_rm_xics.c          |  2 +-
 arch/powerpc/mm/copro_fault.c                 | 18 ++--
 arch/powerpc/mm/hash_utils_64.c               | 45 ++++++---
 arch/powerpc/mm/pgtable-hash64.c              | 13 ++-
 arch/powerpc/mm/pgtable-radix.c               | 24 ++++-
 arch/powerpc/mm/pgtable_64.c                  |  9 +-
 arch/powerpc/mm/ptdump/hashpagetable.c        |  2 +-
 arch/powerpc/mm/ptdump/ptdump.c               |  3 +-
 arch/powerpc/mm/slb.c                         | 26 +++--
 arch/powerpc/platforms/cell/spu_base.c        |  4 +-
 drivers/misc/cxl/fault.c                      |  2 +-
 drivers/misc/ocxl/link.c                      |  2 +-
 21 files changed, 254 insertions(+), 138 deletions(-)

-- 
2.20.1

[PATCH v4 1/8] powerpc/mm/hash64: Add a variable to track the end of IO mapping

[Aneesh Kumar K.V]

This makes it easy to update the region mapping in the later patch

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
 arch/powerpc/include/asm/book3s/64/hash.h    | 3 ++-
 arch/powerpc/include/asm/book3s/64/pgtable.h | 8 +++++---
 arch/powerpc/include/asm/book3s/64/radix.h   | 1 +
 arch/powerpc/mm/hash_utils_64.c              | 1 +
 arch/powerpc/mm/pgtable-radix.c              | 1 +
 arch/powerpc/mm/pgtable_64.c                 | 2 ++
 6 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/hash.h b/arch/powerpc/include/asm/book3s/64/hash.h
index 54b7af6cd27f..8cbc4106d449 100644
--- a/arch/powerpc/include/asm/book3s/64/hash.h
+++ b/arch/powerpc/include/asm/book3s/64/hash.h
@@ -69,7 +69,8 @@
 #define H_VMALLOC_SIZE (H_KERN_VIRT_SIZE - H_KERN_IO_SIZE)
 #define H_VMALLOC_END  (H_VMALLOC_START + H_VMALLOC_SIZE)
 
-#define H_KERN_IO_START H_VMALLOC_END
+#define H_KERN_IO_START	H_VMALLOC_END
+#define H_KERN_IO_END	(H_KERN_VIRT_START + H_KERN_VIRT_SIZE)
 
 /*
  * Region IDs
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 581f91be9dd4..51190a6d1c8a 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -277,9 +277,12 @@ extern unsigned long __vmalloc_end;
 extern unsigned long __kernel_virt_start;
 extern unsigned long __kernel_virt_size;
 extern unsigned long __kernel_io_start;
+extern unsigned long __kernel_io_end;
 #define KERN_VIRT_START __kernel_virt_start
 #define KERN_VIRT_SIZE  __kernel_virt_size
 #define KERN_IO_START  __kernel_io_start
+#define KERN_IO_END __kernel_io_end
+
 extern struct page *vmemmap;
 extern unsigned long ioremap_bot;
 extern unsigned long pci_io_base;
@@ -296,8 +299,7 @@ extern unsigned long pci_io_base;
 
 #include <asm/barrier.h>
 /*
- * The second half of the kernel virtual space is used for IO mappings,
- * it's itself carved into the PIO region (ISA and PHB IO space) and
+ * IO space itself carved into the PIO region (ISA and PHB IO space) and
  * the ioremap space
  *
  *  ISA_IO_BASE = KERN_IO_START, 64K reserved area
@@ -310,7 +312,7 @@ extern unsigned long pci_io_base;
 #define  PHB_IO_BASE	(ISA_IO_END)
 #define  PHB_IO_END	(KERN_IO_START + FULL_IO_SIZE)
 #define IOREMAP_BASE	(PHB_IO_END)
-#define IOREMAP_END	(KERN_VIRT_START + KERN_VIRT_SIZE)
+#define IOREMAP_END	(KERN_IO_END)
 
 /* Advertise special mapping type for AGP */
 #define HAVE_PAGE_AGP
diff --git a/arch/powerpc/include/asm/book3s/64/radix.h b/arch/powerpc/include/asm/book3s/64/radix.h
index 5ab134eeed20..6d760a083d62 100644
--- a/arch/powerpc/include/asm/book3s/64/radix.h
+++ b/arch/powerpc/include/asm/book3s/64/radix.h
@@ -111,6 +111,7 @@
 #define RADIX_VMEMMAP_BASE		(RADIX_VMALLOC_END)
 
 #define RADIX_KERN_IO_START	(RADIX_KERN_VIRT_START + (RADIX_KERN_VIRT_SIZE >> 1))
+#define RADIX_KERN_IO_END       (RADIX_KERN_VIRT_START + RADIX_KERN_VIRT_SIZE)
 
 #ifndef __ASSEMBLY__
 #define RADIX_PTE_TABLE_SIZE	(sizeof(pte_t) << RADIX_PTE_INDEX_SIZE)
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 0a4f939a8161..394dd969002f 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -1017,6 +1017,7 @@ void __init hash__early_init_mmu(void)
 	__vmalloc_start = H_VMALLOC_START;
 	__vmalloc_end = H_VMALLOC_END;
 	__kernel_io_start = H_KERN_IO_START;
+	__kernel_io_end = H_KERN_IO_END;
 	vmemmap = (struct page *)H_VMEMMAP_BASE;
 	ioremap_bot = IOREMAP_BASE;
 
diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index 154472a28c77..bca1bf66c56e 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -578,6 +578,7 @@ void __init radix__early_init_mmu(void)
 	__vmalloc_start = RADIX_VMALLOC_START;
 	__vmalloc_end = RADIX_VMALLOC_END;
 	__kernel_io_start = RADIX_KERN_IO_START;
+	__kernel_io_end = RADIX_KERN_IO_END;
 	vmemmap = (struct page *)RADIX_VMEMMAP_BASE;
 	ioremap_bot = IOREMAP_BASE;
 
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index fb1375c07e8c..7cea39bdf05f 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -98,6 +98,8 @@ unsigned long __vmalloc_end;
 EXPORT_SYMBOL(__vmalloc_end);
 unsigned long __kernel_io_start;
 EXPORT_SYMBOL(__kernel_io_start);
+unsigned long __kernel_io_end;
+EXPORT_SYMBOL(__kernel_io_end);
 struct page *vmemmap;
 EXPORT_SYMBOL(vmemmap);
 unsigned long __pte_frag_nr;
-- 
2.20.1

[PATCH v4 2/8] powerpc/mm/hash64: Map all the kernel regions in the same 0xc range

[Aneesh Kumar K.V]

This patch maps vmalloc, IO and vmemap regions in the 0xc address range
instead of the current 0xd and 0xf range. This brings the mapping closer
to radix translation mode.

With hash 64K page size each of this region is 512TB whereas with 4K config
we are limited by the max page table range of 64TB and hence there regions
are of 16TB size.

The kernel mapping is now:

 On 4K hash

     kernel_region_map_size = 16TB
     kernel vmalloc start   = 0xc000100000000000
     kernel IO start        = 0xc000200000000000
     kernel vmemmap start   = 0xc000300000000000

64K hash, 64K radix and 4k radix:

     kernel_region_map_size = 512TB
     kernel vmalloc start   = 0xc008000000000000
     kernel IO start        = 0xc00a000000000000
     kernel vmemmap start   = 0xc00c000000000000

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
 arch/powerpc/include/asm/book3s/64/hash-4k.h  | 13 +++
 arch/powerpc/include/asm/book3s/64/hash-64k.h | 11 +++
 arch/powerpc/include/asm/book3s/64/hash.h     | 95 ++++++++++++-------
 arch/powerpc/include/asm/book3s/64/mmu-hash.h | 31 +++---
 arch/powerpc/include/asm/book3s/64/pgtable.h  |  1 -
 arch/powerpc/include/asm/book3s/64/radix.h    | 41 ++++----
 arch/powerpc/include/asm/page.h               |  3 +-
 arch/powerpc/kvm/book3s_hv_rm_xics.c          |  2 +-
 arch/powerpc/mm/copro_fault.c                 | 14 ++-
 arch/powerpc/mm/hash_utils_64.c               | 26 ++---
 arch/powerpc/mm/pgtable-radix.c               |  7 +-
 arch/powerpc/mm/pgtable_64.c                  |  2 -
 arch/powerpc/mm/ptdump/hashpagetable.c        |  2 +-
 arch/powerpc/mm/ptdump/ptdump.c               |  3 +-
 arch/powerpc/mm/slb.c                         | 22 +++--
 arch/powerpc/platforms/cell/spu_base.c        |  4 +-
 drivers/misc/cxl/fault.c                      |  2 +-
 drivers/misc/ocxl/link.c                      |  2 +-
 18 files changed, 172 insertions(+), 109 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/hash-4k.h b/arch/powerpc/include/asm/book3s/64/hash-4k.h
index cf5ba5254299..0dd62287f56c 100644
--- a/arch/powerpc/include/asm/book3s/64/hash-4k.h
+++ b/arch/powerpc/include/asm/book3s/64/hash-4k.h
@@ -13,6 +13,19 @@
  */
 #define MAX_EA_BITS_PER_CONTEXT		46
 
+/*
+ * Our page table limit us to 64TB. Hence for the kernel mapping,
+ * each MAP area is limited to 16 TB.
+ * The four map areas are:  linear mapping, vmap, IO and vmemmap
+ */
+#define H_KERN_MAP_SIZE		(ASM_CONST(1) << (MAX_EA_BITS_PER_CONTEXT - 2))
+
+/*
+ * Define the address range of the kernel non-linear virtual area
+ * 16TB
+ */
+#define H_KERN_VIRT_START	ASM_CONST(0xc000100000000000)
+
 #ifndef __ASSEMBLY__
 #define H_PTE_TABLE_SIZE	(sizeof(pte_t) << H_PTE_INDEX_SIZE)
 #define H_PMD_TABLE_SIZE	(sizeof(pmd_t) << H_PMD_INDEX_SIZE)
diff --git a/arch/powerpc/include/asm/book3s/64/hash-64k.h b/arch/powerpc/include/asm/book3s/64/hash-64k.h
index f82ee8a3b561..e392cf17b457 100644
--- a/arch/powerpc/include/asm/book3s/64/hash-64k.h
+++ b/arch/powerpc/include/asm/book3s/64/hash-64k.h
@@ -13,6 +13,17 @@
  */
 #define MAX_EA_BITS_PER_CONTEXT		49
 
+/*
+ * We use one context for each MAP area.
+ */
+#define H_KERN_MAP_SIZE		(1UL << MAX_EA_BITS_PER_CONTEXT)
+
+/*
+ * Define the address range of the kernel non-linear virtual area
+ * 2PB
+ */
+#define H_KERN_VIRT_START	ASM_CONST(0xc008000000000000)
+
 /*
  * 64k aligned address free up few of the lower bits of RPN for us
  * We steal that here. For more deatils look at pte_pfn/pfn_pte()
diff --git a/arch/powerpc/include/asm/book3s/64/hash.h b/arch/powerpc/include/asm/book3s/64/hash.h
index 8cbc4106d449..76741a221910 100644
--- a/arch/powerpc/include/asm/book3s/64/hash.h
+++ b/arch/powerpc/include/asm/book3s/64/hash.h
@@ -29,6 +29,10 @@
 #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.
@@ -42,53 +46,56 @@
 #endif
 
 /*
- * Define the address range of the kernel non-linear virtual area. In contrast
- * to the linear mapping, this is managed using the kernel page tables and then
- * inserted into the hash page table to actually take effect, similarly to user
- * mappings.
+ * +------------------------------+
+ * |                              |
+ * |                              |
+ * |                              |
+ * +------------------------------+  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_KERN_VIRT_START ASM_CONST(0xD000000000000000)
 
-/*
- * Allow virtual mapping of one context size.
- * 512TB for 64K page size
- * 64TB for 4K page size
- */
-#define H_KERN_VIRT_SIZE (1UL << MAX_EA_BITS_PER_CONTEXT)
+#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)
 
-/*
- * 8TB IO mapping size
- */
-#define H_KERN_IO_SIZE ASM_CONST(0x80000000000) /* 8T */
-
-/*
- * The vmalloc space starts at the beginning of the kernel non-linear virtual
- * region, and occupies 504T (64K) or 56T (4K)
- */
-#define H_VMALLOC_START H_KERN_VIRT_START
-#define H_VMALLOC_SIZE (H_KERN_VIRT_SIZE - H_KERN_IO_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_KERN_IO_START	H_VMALLOC_END
-#define H_KERN_IO_END	(H_KERN_VIRT_START + H_KERN_VIRT_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)
 
 /*
  * 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		1
+#define KERNEL_REGION_ID	2
+#define VMALLOC_REGION_ID	3
+#define IO_REGION_ID		4
+#define VMEMMAP_REGION_ID	5
 
 /*
  * 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
@@ -104,6 +111,26 @@
 #define H_PUD_BAD_BITS		(PMD_TABLE_SIZE-1)
 
 #ifndef __ASSEMBLY__
+static inline int get_region_id(unsigned long ea)
+{
+	int id = (ea >> 60UL);
+
+	if (id == 0)
+		return USER_REGION_ID;
+
+	VM_BUG_ON(id != 0xc);
+	VM_BUG_ON(ea >= H_VMEMMAP_END);
+
+	if (ea >= H_VMEMMAP_START)
+		return VMEMMAP_REGION_ID;
+	else if (ea >= H_KERN_IO_START)
+		return IO_REGION_ID;
+	else if (ea >= H_VMALLOC_START)
+		return VMALLOC_REGION_ID;
+
+	return KERNEL_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)
diff --git a/arch/powerpc/include/asm/book3s/64/mmu-hash.h b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
index a28a28079edb..b3f256c042aa 100644
--- a/arch/powerpc/include/asm/book3s/64/mmu-hash.h
+++ b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
@@ -588,7 +588,8 @@ extern void slb_set_size(u16 size);
 #endif
 
 #define MAX_VMALLOC_CTX_CNT	1
-#define MAX_MEMMAP_CTX_CNT	1
+#define MAX_IO_CTX_CNT		1
+#define MAX_VMEMMAP_CTX_CNT	1
 
 /*
  * 256MB segment
@@ -601,13 +602,10 @@ extern void slb_set_size(u16 size);
  * would give a protovsid of 0x1fffffffff. That will result in a VSID 0
  * because of the modulo operation in vsid scramble.
  *
- * We add one extra context to MIN_USER_CONTEXT so that we can map kernel
- * context easily. The +1 is to map the unused 0xe region mapping.
  */
 #define MAX_USER_CONTEXT	((ASM_CONST(1) << CONTEXT_BITS) - 2)
 #define MIN_USER_CONTEXT	(MAX_KERNEL_CTX_CNT + MAX_VMALLOC_CTX_CNT + \
-				 MAX_MEMMAP_CTX_CNT + 2)
-
+				 MAX_IO_CTX_CNT + MAX_VMEMMAP_CTX_CNT)
 /*
  * For platforms that support on 65bit VA we limit the context bits
  */
@@ -747,7 +745,7 @@ static inline unsigned long get_vsid(unsigned long context, unsigned long ea,
 	/*
 	 * Bad address. We return VSID 0 for that
 	 */
-	if ((ea & ~REGION_MASK) >= H_PGTABLE_RANGE)
+	if ((ea & EA_MASK)  >= H_PGTABLE_RANGE)
 		return 0;
 
 	if (!mmu_has_feature(MMU_FTR_68_BIT_VA))
@@ -774,28 +772,29 @@ static inline unsigned long get_vsid(unsigned long context, unsigned long ea,
  * 0x00002 -  [ 0xc002000000000000 - 0xc003ffffffffffff]
  * 0x00003 -  [ 0xc004000000000000 - 0xc005ffffffffffff]
  * 0x00004 -  [ 0xc006000000000000 - 0xc007ffffffffffff]
-
- * 0x00005 -  [ 0xd000000000000000 - 0xd001ffffffffffff ]
- * 0x00006 -  Not used - Can map 0xe000000000000000 range.
- * 0x00007 -  [ 0xf000000000000000 - 0xf001ffffffffffff ]
  *
- * So we can compute the context from the region (top nibble) by
- * subtracting 11, or 0xc - 1.
+ * vmap, IO, vmemap
+ *
+ * 0x00005 -  [ 0xc008000000000000 - 0xc009ffffffffffff]
+ * 0x00006 -  [ 0xc00a000000000000 - 0xc00bffffffffffff]
+ * 0x00007 -  [ 0xc00c000000000000 - 0xc00dffffffffffff]
+ *
  */
 static inline unsigned long get_kernel_context(unsigned long ea)
 {
-	unsigned long region_id = REGION_ID(ea);
+	unsigned long region_id = get_region_id(ea);
 	unsigned long ctx;
 	/*
-	 * For linear mapping we do support multiple context
+	 * Depending on Kernel config, kernel region can have one context
+	 * or more.
 	 */
 	if (region_id == KERNEL_REGION_ID) {
 		/*
 		 * We already verified ea to be not beyond the addr limit.
 		 */
-		ctx =  1 + ((ea & ~REGION_MASK) >> MAX_EA_BITS_PER_CONTEXT);
+		ctx =  1 + ((ea & EA_MASK) >> MAX_EA_BITS_PER_CONTEXT);
 	} else
-		ctx = (region_id - 0xc) + MAX_KERNEL_CTX_CNT;
+		ctx = region_id + MAX_KERNEL_CTX_CNT - 2;
 	return ctx;
 }
 
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 51190a6d1c8a..8c156c5b4cd5 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -279,7 +279,6 @@ extern unsigned long __kernel_virt_size;
 extern unsigned long __kernel_io_start;
 extern unsigned long __kernel_io_end;
 #define KERN_VIRT_START __kernel_virt_start
-#define KERN_VIRT_SIZE  __kernel_virt_size
 #define KERN_IO_START  __kernel_io_start
 #define KERN_IO_END __kernel_io_end
 
diff --git a/arch/powerpc/include/asm/book3s/64/radix.h b/arch/powerpc/include/asm/book3s/64/radix.h
index 6d760a083d62..574eca33f893 100644
--- a/arch/powerpc/include/asm/book3s/64/radix.h
+++ b/arch/powerpc/include/asm/book3s/64/radix.h
@@ -72,19 +72,17 @@
  * |                              |
  * |                              |
  * |                              |
- * +------------------------------+  Kernel IO map end (0xc010000000000000)
+ * +------------------------------+  Kernel vmemmap end (0xc010000000000000)
  * |                              |
+ * |           512TB		  |
  * |                              |
- * |      1/2 of virtual map      |
+ * +------------------------------+  Kernel IO map end/vmemap start
  * |                              |
+ * |           512TB		  |
  * |                              |
- * +------------------------------+  Kernel IO map start
+ * +------------------------------+  Kernel vmap end/ IO map start
  * |                              |
- * |      1/4 of virtual map      |
- * |                              |
- * +------------------------------+  Kernel vmemap start
- * |                              |
- * |     1/4 of virtual map       |
+ * |           512TB		  |
  * |                              |
  * +------------------------------+  Kernel virt start (0xc008000000000000)
  * |                              |
@@ -93,25 +91,24 @@
  * +------------------------------+  Kernel linear (0xc.....)
  */
 
-#define RADIX_KERN_VIRT_START ASM_CONST(0xc008000000000000)
-#define RADIX_KERN_VIRT_SIZE  ASM_CONST(0x0008000000000000)
-
+#define RADIX_KERN_VIRT_START	ASM_CONST(0xc008000000000000)
 /*
- * The vmalloc space starts at the beginning of that region, and
- * occupies a quarter of it on radix config.
- * (we keep a quarter for the virtual memmap)
+ * 49 =  MAX_EA_BITS_PER_CONTEXT (hash specific). To make sure we pick
+ * the same value as hash.
  */
+#define RADIX_KERN_MAP_SIZE	(1UL << 49)
+
 #define RADIX_VMALLOC_START	RADIX_KERN_VIRT_START
-#define RADIX_VMALLOC_SIZE	(RADIX_KERN_VIRT_SIZE >> 2)
+#define RADIX_VMALLOC_SIZE	RADIX_KERN_MAP_SIZE
 #define RADIX_VMALLOC_END	(RADIX_VMALLOC_START + RADIX_VMALLOC_SIZE)
-/*
- * Defines the address of the vmemap area, in its own region on
- * hash table CPUs.
- */
-#define RADIX_VMEMMAP_BASE		(RADIX_VMALLOC_END)
 
-#define RADIX_KERN_IO_START	(RADIX_KERN_VIRT_START + (RADIX_KERN_VIRT_SIZE >> 1))
-#define RADIX_KERN_IO_END       (RADIX_KERN_VIRT_START + RADIX_KERN_VIRT_SIZE)
+#define RADIX_KERN_IO_START	RADIX_VMALLOC_END
+#define RADIX_KERN_IO_SIZE	RADIX_KERN_MAP_SIZE
+#define RADIX_KERN_IO_END	(RADIX_KERN_IO_START + RADIX_KERN_IO_SIZE)
+
+#define RADIX_VMEMMAP_START	RADIX_KERN_IO_END
+#define RADIX_VMEMMAP_SIZE	RADIX_KERN_MAP_SIZE
+#define RADIX_VMEMMAP_END	(RADIX_VMEMMAP_START + RADIX_VMEMMAP_SIZE)
 
 #ifndef __ASSEMBLY__
 #define RADIX_PTE_TABLE_SIZE	(sizeof(pte_t) << RADIX_PTE_INDEX_SIZE)
diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
index ed870468ef6f..918228f2205b 100644
--- a/arch/powerpc/include/asm/page.h
+++ b/arch/powerpc/include/asm/page.h
@@ -139,7 +139,8 @@ static inline bool pfn_valid(unsigned long pfn)
  * return true for some vmalloc addresses, which is incorrect. So explicitly
  * check that the address is in the kernel region.
  */
-#define virt_addr_valid(kaddr) (REGION_ID(kaddr) == KERNEL_REGION_ID && \
+/* may be can drop get_region_id */
+#define virt_addr_valid(kaddr) (get_region_id((unsigned long)kaddr) == KERNEL_REGION_ID && \
 				pfn_valid(virt_to_pfn(kaddr)))
 #else
 #define virt_addr_valid(kaddr)	pfn_valid(virt_to_pfn(kaddr))
diff --git a/arch/powerpc/kvm/book3s_hv_rm_xics.c b/arch/powerpc/kvm/book3s_hv_rm_xics.c
index 3b9662a4207e..085509148d95 100644
--- a/arch/powerpc/kvm/book3s_hv_rm_xics.c
+++ b/arch/powerpc/kvm/book3s_hv_rm_xics.c
@@ -822,7 +822,7 @@ static inline void this_cpu_inc_rm(unsigned int __percpu *addr)
 	raddr = per_cpu_ptr(addr, cpu);
 	l = (unsigned long)raddr;
 
-	if (REGION_ID(l) == VMALLOC_REGION_ID) {
+	if (get_region_id(l) == VMALLOC_REGION_ID) {
 		l = vmalloc_to_phys(raddr);
 		raddr = (unsigned int *)l;
 	}
diff --git a/arch/powerpc/mm/copro_fault.c b/arch/powerpc/mm/copro_fault.c
index c8da352e8686..9b0321061bc8 100644
--- a/arch/powerpc/mm/copro_fault.c
+++ b/arch/powerpc/mm/copro_fault.c
@@ -105,7 +105,7 @@ int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb)
 	u64 vsid, vsidkey;
 	int psize, ssize;
 
-	switch (REGION_ID(ea)) {
+	switch (get_region_id(ea)) {
 	case USER_REGION_ID:
 		pr_devel("%s: 0x%llx -- USER_REGION_ID\n", __func__, ea);
 		if (mm == NULL)
@@ -117,10 +117,14 @@ int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb)
 		break;
 	case VMALLOC_REGION_ID:
 		pr_devel("%s: 0x%llx -- VMALLOC_REGION_ID\n", __func__, ea);
-		if (ea < VMALLOC_END)
-			psize = mmu_vmalloc_psize;
-		else
-			psize = mmu_io_psize;
+		psize = mmu_vmalloc_psize;
+		ssize = mmu_kernel_ssize;
+		vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
+		vsidkey = SLB_VSID_KERNEL;
+		break;
+	case IO_REGION_ID:
+		pr_devel("%s: 0x%llx -- IO_REGION_ID\n", __func__, ea);
+		psize = mmu_io_psize;
 		ssize = mmu_kernel_ssize;
 		vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
 		vsidkey = SLB_VSID_KERNEL;
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 394dd969002f..c6b39e7694ba 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -1013,12 +1013,11 @@ void __init hash__early_init_mmu(void)
 	__pgd_val_bits = HASH_PGD_VAL_BITS;
 
 	__kernel_virt_start = H_KERN_VIRT_START;
-	__kernel_virt_size = H_KERN_VIRT_SIZE;
 	__vmalloc_start = H_VMALLOC_START;
 	__vmalloc_end = H_VMALLOC_END;
 	__kernel_io_start = H_KERN_IO_START;
 	__kernel_io_end = H_KERN_IO_END;
-	vmemmap = (struct page *)H_VMEMMAP_BASE;
+	vmemmap = (struct page *)H_VMEMMAP_START;
 	ioremap_bot = IOREMAP_BASE;
 
 #ifdef CONFIG_PCI
@@ -1239,7 +1238,7 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea,
 	trace_hash_fault(ea, access, trap);
 
 	/* Get region & vsid */
- 	switch (REGION_ID(ea)) {
+	switch (get_region_id(ea)) {
 	case USER_REGION_ID:
 		user_region = 1;
 		if (! mm) {
@@ -1253,10 +1252,13 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea,
 		break;
 	case VMALLOC_REGION_ID:
 		vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
-		if (ea < VMALLOC_END)
-			psize = mmu_vmalloc_psize;
-		else
-			psize = mmu_io_psize;
+		psize = mmu_vmalloc_psize;
+		ssize = mmu_kernel_ssize;
+		break;
+
+	case IO_REGION_ID:
+		vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
+		psize = mmu_io_psize;
 		ssize = mmu_kernel_ssize;
 		break;
 	default:
@@ -1422,7 +1424,8 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap,
 	unsigned long flags = 0;
 	struct mm_struct *mm = current->mm;
 
-	if (REGION_ID(ea) == VMALLOC_REGION_ID)
+	if ((get_region_id(ea) == VMALLOC_REGION_ID) ||
+	    (get_region_id(ea) == IO_REGION_ID))
 		mm = &init_mm;
 
 	if (dsisr & DSISR_NOHPTE)
@@ -1438,8 +1441,9 @@ int __hash_page(unsigned long ea, unsigned long msr, unsigned long trap,
 	unsigned long access = _PAGE_PRESENT | _PAGE_READ;
 	unsigned long flags = 0;
 	struct mm_struct *mm = current->mm;
+	unsigned int region_id = get_region_id(ea);
 
-	if (REGION_ID(ea) == VMALLOC_REGION_ID)
+	if ((region_id == VMALLOC_REGION_ID) || (region_id == IO_REGION_ID))
 		mm = &init_mm;
 
 	if (dsisr & DSISR_NOHPTE)
@@ -1456,7 +1460,7 @@ int __hash_page(unsigned long ea, unsigned long msr, unsigned long trap,
 	 * 2) user space access kernel space.
 	 */
 	access |= _PAGE_PRIVILEGED;
-	if ((msr & MSR_PR) || (REGION_ID(ea) == USER_REGION_ID))
+	if ((msr & MSR_PR) || (region_id == USER_REGION_ID))
 		access &= ~_PAGE_PRIVILEGED;
 
 	if (trap == 0x400)
@@ -1500,7 +1504,7 @@ void hash_preload(struct mm_struct *mm, unsigned long ea,
 	int rc, ssize, update_flags = 0;
 	unsigned long access = _PAGE_PRESENT | _PAGE_READ | (is_exec ? _PAGE_EXEC : 0);
 
-	BUG_ON(REGION_ID(ea) != USER_REGION_ID);
+	BUG_ON(get_region_id(ea) != USER_REGION_ID);
 
 	if (!should_hash_preload(mm, ea))
 		return;
diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index bca1bf66c56e..94b18996e1b0 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -135,6 +135,10 @@ static int __map_kernel_page(unsigned long ea, unsigned long pa,
 	 */
 	BUILD_BUG_ON(TASK_SIZE_USER64 > RADIX_PGTABLE_RANGE);
 
+#ifdef CONFIG_PPC_64K_PAGES
+	BUILD_BUG_ON(RADIX_KERN_MAP_SIZE != MAX_EA_BITS_PER_CONTEXT);
+#endif
+
 	if (unlikely(!slab_is_available()))
 		return early_map_kernel_page(ea, pa, flags, map_page_size,
 						nid, region_start, region_end);
@@ -574,12 +578,11 @@ void __init radix__early_init_mmu(void)
 	__pgd_val_bits = RADIX_PGD_VAL_BITS;
 
 	__kernel_virt_start = RADIX_KERN_VIRT_START;
-	__kernel_virt_size = RADIX_KERN_VIRT_SIZE;
 	__vmalloc_start = RADIX_VMALLOC_START;
 	__vmalloc_end = RADIX_VMALLOC_END;
 	__kernel_io_start = RADIX_KERN_IO_START;
 	__kernel_io_end = RADIX_KERN_IO_END;
-	vmemmap = (struct page *)RADIX_VMEMMAP_BASE;
+	vmemmap = (struct page *)RADIX_VMEMMAP_START;
 	ioremap_bot = IOREMAP_BASE;
 
 #ifdef CONFIG_PCI
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index 7cea39bdf05f..56068cac2a3c 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -90,8 +90,6 @@ unsigned long __pgd_val_bits;
 EXPORT_SYMBOL(__pgd_val_bits);
 unsigned long __kernel_virt_start;
 EXPORT_SYMBOL(__kernel_virt_start);
-unsigned long __kernel_virt_size;
-EXPORT_SYMBOL(__kernel_virt_size);
 unsigned long __vmalloc_start;
 EXPORT_SYMBOL(__vmalloc_start);
 unsigned long __vmalloc_end;
diff --git a/arch/powerpc/mm/ptdump/hashpagetable.c b/arch/powerpc/mm/ptdump/hashpagetable.c
index b430e4e08af6..b9bda0105841 100644
--- a/arch/powerpc/mm/ptdump/hashpagetable.c
+++ b/arch/powerpc/mm/ptdump/hashpagetable.c
@@ -500,7 +500,7 @@ static void populate_markers(void)
 	address_markers[7].start_address = IOREMAP_BASE;
 	address_markers[8].start_address = IOREMAP_END;
 #ifdef CONFIG_PPC_BOOK3S_64
-	address_markers[9].start_address =  H_VMEMMAP_BASE;
+	address_markers[9].start_address =  H_VMEMMAP_START;
 #else
 	address_markers[9].start_address =  VMEMMAP_BASE;
 #endif
diff --git a/arch/powerpc/mm/ptdump/ptdump.c b/arch/powerpc/mm/ptdump/ptdump.c
index 37138428ab55..63fc56feea15 100644
--- a/arch/powerpc/mm/ptdump/ptdump.c
+++ b/arch/powerpc/mm/ptdump/ptdump.c
@@ -303,8 +303,9 @@ static void populate_markers(void)
 	address_markers[i++].start_address = PHB_IO_END;
 	address_markers[i++].start_address = IOREMAP_BASE;
 	address_markers[i++].start_address = IOREMAP_END;
+	/* What is the ifdef about? */
 #ifdef CONFIG_PPC_BOOK3S_64
-	address_markers[i++].start_address =  H_VMEMMAP_BASE;
+	address_markers[i++].start_address =  H_VMEMMAP_START;
 #else
 	address_markers[i++].start_address =  VMEMMAP_BASE;
 #endif
diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c
index 5986df48359b..a0c37f428d60 100644
--- a/arch/powerpc/mm/slb.c
+++ b/arch/powerpc/mm/slb.c
@@ -694,7 +694,7 @@ static long slb_allocate_kernel(unsigned long ea, unsigned long id)
 	if (id == KERNEL_REGION_ID) {
 
 		/* We only support upto MAX_PHYSMEM_BITS */
-		if ((ea & ~REGION_MASK) > (1UL << MAX_PHYSMEM_BITS))
+		if ((ea & EA_MASK) > (1UL << MAX_PHYSMEM_BITS))
 			return -EFAULT;
 
 		flags = SLB_VSID_KERNEL | mmu_psize_defs[mmu_linear_psize].sllp;
@@ -702,20 +702,25 @@ static long slb_allocate_kernel(unsigned long ea, unsigned long id)
 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 	} else if (id == VMEMMAP_REGION_ID) {
 
-		if ((ea & ~REGION_MASK) >= (1ULL << MAX_EA_BITS_PER_CONTEXT))
+		if (ea >= H_VMEMMAP_END)
 			return -EFAULT;
 
 		flags = SLB_VSID_KERNEL | mmu_psize_defs[mmu_vmemmap_psize].sllp;
 #endif
 	} else if (id == VMALLOC_REGION_ID) {
 
-		if ((ea & ~REGION_MASK) >= (1ULL << MAX_EA_BITS_PER_CONTEXT))
+		if (ea >= H_VMALLOC_END)
 			return -EFAULT;
 
-		if (ea < H_VMALLOC_END)
-			flags = local_paca->vmalloc_sllp;
-		else
-			flags = SLB_VSID_KERNEL | mmu_psize_defs[mmu_io_psize].sllp;
+		flags = local_paca->vmalloc_sllp;
+
+	} else if (id == IO_REGION_ID) {
+
+		if (ea >= H_KERN_IO_END)
+			return -EFAULT;
+
+		flags = SLB_VSID_KERNEL | mmu_psize_defs[mmu_io_psize].sllp;
+
 	} else {
 		return -EFAULT;
 	}
@@ -725,6 +730,7 @@ static long slb_allocate_kernel(unsigned long ea, unsigned long id)
 		ssize = MMU_SEGSIZE_256M;
 
 	context = get_kernel_context(ea);
+
 	return slb_insert_entry(ea, context, flags, ssize, true);
 }
 
@@ -761,7 +767,7 @@ static long slb_allocate_user(struct mm_struct *mm, unsigned long ea)
 
 long do_slb_fault(struct pt_regs *regs, unsigned long ea)
 {
-	unsigned long id = REGION_ID(ea);
+	unsigned long id = get_region_id(ea);
 
 	/* IRQs are not reconciled here, so can't check irqs_disabled */
 	VM_WARN_ON(mfmsr() & MSR_EE);
diff --git a/arch/powerpc/platforms/cell/spu_base.c b/arch/powerpc/platforms/cell/spu_base.c
index 7f12c7b78c0f..4770cce1bfe2 100644
--- a/arch/powerpc/platforms/cell/spu_base.c
+++ b/arch/powerpc/platforms/cell/spu_base.c
@@ -194,7 +194,7 @@ static int __spu_trap_data_map(struct spu *spu, unsigned long ea, u64 dsisr)
 	 * faults need to be deferred to process context.
 	 */
 	if ((dsisr & MFC_DSISR_PTE_NOT_FOUND) &&
-	    (REGION_ID(ea) != USER_REGION_ID)) {
+	    (get_region_id(ea) != USER_REGION_ID)) {
 
 		spin_unlock(&spu->register_lock);
 		ret = hash_page(ea,
@@ -224,7 +224,7 @@ static void __spu_kernel_slb(void *addr, struct copro_slb *slb)
 	unsigned long ea = (unsigned long)addr;
 	u64 llp;
 
-	if (REGION_ID(ea) == KERNEL_REGION_ID)
+	if (get_region_id(ea) == KERNEL_REGION_ID)
 		llp = mmu_psize_defs[mmu_linear_psize].sllp;
 	else
 		llp = mmu_psize_defs[mmu_virtual_psize].sllp;
diff --git a/drivers/misc/cxl/fault.c b/drivers/misc/cxl/fault.c
index dc7b34174f85..a4d17a5a9763 100644
--- a/drivers/misc/cxl/fault.c
+++ b/drivers/misc/cxl/fault.c
@@ -168,7 +168,7 @@ int cxl_handle_mm_fault(struct mm_struct *mm, u64 dsisr, u64 dar)
 		if (dsisr & CXL_PSL_DSISR_An_S)
 			access |= _PAGE_WRITE;
 
-		if (!mm && (REGION_ID(dar) != USER_REGION_ID))
+		if (!mm && (get_region_id(dar) != USER_REGION_ID))
 			access |= _PAGE_PRIVILEGED;
 
 		if (dsisr & DSISR_NOHPTE)
diff --git a/drivers/misc/ocxl/link.c b/drivers/misc/ocxl/link.c
index d50b861d7e57..04ec3d74f828 100644
--- a/drivers/misc/ocxl/link.c
+++ b/drivers/misc/ocxl/link.c
@@ -163,7 +163,7 @@ static void xsl_fault_handler_bh(struct work_struct *fault_work)
 		if (fault->dsisr & SPA_XSL_S)
 			access |= _PAGE_WRITE;
 
-		if (REGION_ID(fault->dar) != USER_REGION_ID)
+		if (get_region_id(fault->dar) != USER_REGION_ID)
 			access |= _PAGE_PRIVILEGED;
 
 		local_irq_save(flags);
-- 
2.20.1

[PATCH v4 3/8] powerpc/mm: Validate address values against different region limits

[Aneesh Kumar K.V]

This adds an explicit check in various functions.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
 arch/powerpc/mm/hash_utils_64.c  | 18 +++++++++++++++---
 arch/powerpc/mm/pgtable-hash64.c | 13 ++++++++++---
 arch/powerpc/mm/pgtable-radix.c  | 16 ++++++++++++++++
 arch/powerpc/mm/pgtable_64.c     |  5 +++++
 4 files changed, 46 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index c6b39e7694ba..ef0ca3bf555d 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -786,9 +786,16 @@ void resize_hpt_for_hotplug(unsigned long new_mem_size)
 
 int hash__create_section_mapping(unsigned long start, unsigned long end, int nid)
 {
-	int rc = htab_bolt_mapping(start, end, __pa(start),
-				   pgprot_val(PAGE_KERNEL), mmu_linear_psize,
-				   mmu_kernel_ssize);
+	int rc;
+
+	if (end >= H_VMALLOC_START) {
+		pr_warn("Outisde the supported range\n");
+		return -1;
+	}
+
+	rc = htab_bolt_mapping(start, end, __pa(start),
+			       pgprot_val(PAGE_KERNEL), mmu_linear_psize,
+			       mmu_kernel_ssize);
 
 	if (rc < 0) {
 		int rc2 = htab_remove_mapping(start, end, mmu_linear_psize,
@@ -929,6 +936,11 @@ static void __init htab_initialize(void)
 		DBG("creating mapping for region: %lx..%lx (prot: %lx)\n",
 		    base, size, prot);
 
+		if ((base + size) >= H_VMALLOC_START) {
+			pr_warn("Outisde the supported range\n");
+			continue;
+		}
+
 		BUG_ON(htab_bolt_mapping(base, base + size, __pa(base),
 				prot, mmu_linear_psize, mmu_kernel_ssize));
 	}
diff --git a/arch/powerpc/mm/pgtable-hash64.c b/arch/powerpc/mm/pgtable-hash64.c
index c08d49046a96..d934de4e2b3a 100644
--- a/arch/powerpc/mm/pgtable-hash64.c
+++ b/arch/powerpc/mm/pgtable-hash64.c
@@ -112,9 +112,16 @@ int __meminit hash__vmemmap_create_mapping(unsigned long start,
 				       unsigned long page_size,
 				       unsigned long phys)
 {
-	int rc = htab_bolt_mapping(start, start + page_size, phys,
-				   pgprot_val(PAGE_KERNEL),
-				   mmu_vmemmap_psize, mmu_kernel_ssize);
+	int rc;
+
+	if ((start + page_size) >= H_VMEMMAP_END) {
+		pr_warn("Outisde the supported range\n");
+		return -1;
+	}
+
+	rc = htab_bolt_mapping(start, start + page_size, phys,
+			       pgprot_val(PAGE_KERNEL),
+			       mmu_vmemmap_psize, mmu_kernel_ssize);
 	if (rc < 0) {
 		int rc2 = htab_remove_mapping(start, start + page_size,
 					      mmu_vmemmap_psize,
diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index 94b18996e1b0..263c3ff662c3 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -338,6 +338,12 @@ void __init radix_init_pgtable(void)
 		 * page tables will be allocated within the range. No
 		 * need or a node (which we don't have yet).
 		 */
+
+		if ((reg->base + reg->size) >= RADIX_VMALLOC_START) {
+			pr_warn("Outisde the supported range\n");
+			continue;
+		}
+
 		WARN_ON(create_physical_mapping(reg->base,
 						reg->base + reg->size,
 						-1));
@@ -870,6 +876,11 @@ static void __meminit remove_pagetable(unsigned long start, unsigned long end)
 
 int __meminit radix__create_section_mapping(unsigned long start, unsigned long end, int nid)
 {
+	if (end >= RADIX_VMALLOC_START) {
+		pr_warn("Outisde the supported range\n");
+		return -1;
+	}
+
 	return create_physical_mapping(start, end, nid);
 }
 
@@ -897,6 +908,11 @@ int __meminit radix__vmemmap_create_mapping(unsigned long start,
 	int nid = early_pfn_to_nid(phys >> PAGE_SHIFT);
 	int ret;
 
+	if ((start + page_size) >= RADIX_VMEMMAP_END) {
+		pr_warn("Outisde the supported range\n");
+		return -1;
+	}
+
 	ret = __map_kernel_page_nid(start, phys, __pgprot(flags), page_size, nid);
 	BUG_ON(ret);
 
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index 56068cac2a3c..72f58c076e26 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -121,6 +121,11 @@ void __iomem *__ioremap_at(phys_addr_t pa, void *ea, unsigned long size, pgprot_
 	if (pgprot_val(prot) & H_PAGE_4K_PFN)
 		return NULL;
 
+	if ((ea + size) >= (void *)IOREMAP_END) {
+		pr_warn("Outisde the supported range\n");
+		return NULL;
+	}
+
 	WARN_ON(pa & ~PAGE_MASK);
 	WARN_ON(((unsigned long)ea) & ~PAGE_MASK);
 	WARN_ON(size & ~PAGE_MASK);
-- 
2.20.1

[PATCH v4 4/8] powerpc/mm: Drop the unnecessary region check

[Aneesh Kumar K.V]

All the regions are now mapped with top nibble 0xc. Hence the region id
check is not needed for virt_addr_valid()

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
 arch/powerpc/include/asm/page.h | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
index 918228f2205b..748f5db2e2b7 100644
--- a/arch/powerpc/include/asm/page.h
+++ b/arch/powerpc/include/asm/page.h
@@ -132,19 +132,7 @@ static inline bool pfn_valid(unsigned long pfn)
 #define virt_to_page(kaddr)	pfn_to_page(virt_to_pfn(kaddr))
 #define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
 
-#ifdef CONFIG_PPC_BOOK3S_64
-/*
- * On hash the vmalloc and other regions alias to the kernel region when passed
- * through __pa(), which virt_to_pfn() uses. That means virt_addr_valid() can
- * return true for some vmalloc addresses, which is incorrect. So explicitly
- * check that the address is in the kernel region.
- */
-/* may be can drop get_region_id */
-#define virt_addr_valid(kaddr) (get_region_id((unsigned long)kaddr) == KERNEL_REGION_ID && \
-				pfn_valid(virt_to_pfn(kaddr)))
-#else
 #define virt_addr_valid(kaddr)	pfn_valid(virt_to_pfn(kaddr))
-#endif
 
 /*
  * On Book-E parts we need __va to parse the device tree and we can't
-- 
2.20.1

[PATCH v4 5/8] powerpc/mm/hash: Simplify the region id calculation.

[Aneesh Kumar K.V]

This reduces multiple comparisons in get_region_id to a bit shift operation.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
 arch/powerpc/include/asm/book3s/64/hash-4k.h  |  4 ++-
 arch/powerpc/include/asm/book3s/64/hash-64k.h |  1 +
 arch/powerpc/include/asm/book3s/64/hash.h     | 31 +++++++++----------
 arch/powerpc/include/asm/book3s/64/mmu-hash.h |  2 +-
 4 files changed, 20 insertions(+), 18 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/hash-4k.h b/arch/powerpc/include/asm/book3s/64/hash-4k.h
index 0dd62287f56c..64eaf187f891 100644
--- a/arch/powerpc/include/asm/book3s/64/hash-4k.h
+++ b/arch/powerpc/include/asm/book3s/64/hash-4k.h
@@ -13,12 +13,14 @@
  */
 #define MAX_EA_BITS_PER_CONTEXT		46
 
+#define REGION_SHIFT		(MAX_EA_BITS_PER_CONTEXT - 2)
+
 /*
  * Our page table limit us to 64TB. Hence for the kernel mapping,
  * each MAP area is limited to 16 TB.
  * The four map areas are:  linear mapping, vmap, IO and vmemmap
  */
-#define H_KERN_MAP_SIZE		(ASM_CONST(1) << (MAX_EA_BITS_PER_CONTEXT - 2))
+#define H_KERN_MAP_SIZE		(ASM_CONST(1) << REGION_SHIFT)
 
 /*
  * Define the address range of the kernel non-linear virtual area
diff --git a/arch/powerpc/include/asm/book3s/64/hash-64k.h b/arch/powerpc/include/asm/book3s/64/hash-64k.h
index e392cf17b457..24ca63beba14 100644
--- a/arch/powerpc/include/asm/book3s/64/hash-64k.h
+++ b/arch/powerpc/include/asm/book3s/64/hash-64k.h
@@ -12,6 +12,7 @@
  * is handled in the hotpath.
  */
 #define MAX_EA_BITS_PER_CONTEXT		49
+#define REGION_SHIFT		MAX_EA_BITS_PER_CONTEXT
 
 /*
  * We use one context for each MAP area.
diff --git a/arch/powerpc/include/asm/book3s/64/hash.h b/arch/powerpc/include/asm/book3s/64/hash.h
index 76741a221910..7faa3d7214c0 100644
--- a/arch/powerpc/include/asm/book3s/64/hash.h
+++ b/arch/powerpc/include/asm/book3s/64/hash.h
@@ -83,26 +83,26 @@
 #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 USER_REGION_ID		1
-#define KERNEL_REGION_ID	2
-#define VMALLOC_REGION_ID	3
-#define IO_REGION_ID		4
-#define VMEMMAP_REGION_ID	5
+#define USER_REGION_ID		0
+#define KERNEL_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)
 
 /*
  * Defines the address of the vmemap area, in its own region on
  * hash table CPUs.
  */
-
 #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
 #define _PTEIDX_GROUP_IX	0x7
@@ -113,22 +113,21 @@
 #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;
 
-	VM_BUG_ON(id != 0xc);
-	VM_BUG_ON(ea >= H_VMEMMAP_END);
+	if (ea < H_KERN_VIRT_START)
+		return KERNEL_REGION_ID;
 
-	if (ea >= H_VMEMMAP_START)
-		return VMEMMAP_REGION_ID;
-	else if (ea >= H_KERN_IO_START)
-		return IO_REGION_ID;
-	else if (ea >= H_VMALLOC_START)
-		return VMALLOC_REGION_ID;
+	VM_BUG_ON(id != 0xc);
+	BUILD_BUG_ON(NON_LINEAR_REGION_ID(H_VMALLOC_START) != 2);
 
-	return KERNEL_REGION_ID;
+	region_id = NON_LINEAR_REGION_ID(ea);
+	VM_BUG_ON(region_id > VMEMMAP_REGION_ID);
+	return region_id;
 }
 
 #define	hash__pmd_bad(pmd)		(pmd_val(pmd) & H_PMD_BAD_BITS)
diff --git a/arch/powerpc/include/asm/book3s/64/mmu-hash.h b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
index b3f256c042aa..b146448109fd 100644
--- a/arch/powerpc/include/asm/book3s/64/mmu-hash.h
+++ b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
@@ -794,7 +794,7 @@ static inline unsigned long get_kernel_context(unsigned long ea)
 		 */
 		ctx =  1 + ((ea & EA_MASK) >> MAX_EA_BITS_PER_CONTEXT);
 	} else
-		ctx = region_id + MAX_KERNEL_CTX_CNT - 2;
+		ctx = region_id + MAX_KERNEL_CTX_CNT - 1;
 	return ctx;
 }
 
-- 
2.20.1

[PATCH v4 6/8] powerpc/mm: Print kernel map details to dmesg

[Aneesh Kumar K.V]

This helps in debugging. We can look at the dmesg to find out
different kernel mapping details.

On 4K config this shows

 kernel vmalloc start   = 0xc000100000000000
 kernel IO start        = 0xc000200000000000
 kernel vmemmap start   = 0xc000300000000000

On 64K config:

 kernel vmalloc start   = 0xc008000000000000
 kernel IO start        = 0xc00a000000000000
 kernel vmemmap start   = 0xc00c000000000000

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
 arch/powerpc/kernel/setup-common.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 2e5dfb6e0823..a7ab9638ebd9 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -831,6 +831,9 @@ static __init void print_system_info(void)
 		pr_info("htab_address      = 0x%p\n", htab_address);
 	if (htab_hash_mask)
 		pr_info("htab_hash_mask    = 0x%lx\n", htab_hash_mask);
+	pr_info("kernel vmalloc start   = 0x%lx\n", KERN_VIRT_START);
+	pr_info("kernel IO start        = 0x%lx\n", KERN_IO_START);
+	pr_info("kernel vmemmap start   = 0x%lx\n", (unsigned long)vmemmap);
 #endif
 #ifdef CONFIG_PPC_BOOK3S_32
 	if (Hash)
-- 
2.20.1

[PATCH v4 7/8] powerpc/mm/hash: Rename KERNEL_REGION_ID to LINEAR_MAP_REGION_ID

[Aneesh Kumar K.V]

The region actually point to linear map. Rename the #define to
clarify thati.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
 arch/powerpc/include/asm/book3s/64/hash.h     | 4 ++--
 arch/powerpc/include/asm/book3s/64/mmu-hash.h | 2 +-
 arch/powerpc/mm/copro_fault.c                 | 4 ++--
 arch/powerpc/mm/slb.c                         | 4 ++--
 arch/powerpc/platforms/cell/spu_base.c        | 2 +-
 5 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/hash.h b/arch/powerpc/include/asm/book3s/64/hash.h
index 7faa3d7214c0..1d1183048cfd 100644
--- a/arch/powerpc/include/asm/book3s/64/hash.h
+++ b/arch/powerpc/include/asm/book3s/64/hash.h
@@ -89,7 +89,7 @@
  * Region IDs
  */
 #define USER_REGION_ID		0
-#define KERNEL_REGION_ID	1
+#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)
@@ -120,7 +120,7 @@ static inline int get_region_id(unsigned long ea)
 		return USER_REGION_ID;
 
 	if (ea < H_KERN_VIRT_START)
-		return KERNEL_REGION_ID;
+		return LINEAR_MAP_REGION_ID;
 
 	VM_BUG_ON(id != 0xc);
 	BUILD_BUG_ON(NON_LINEAR_REGION_ID(H_VMALLOC_START) != 2);
diff --git a/arch/powerpc/include/asm/book3s/64/mmu-hash.h b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
index b146448109fd..5d2adf3c1325 100644
--- a/arch/powerpc/include/asm/book3s/64/mmu-hash.h
+++ b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
@@ -788,7 +788,7 @@ static inline unsigned long get_kernel_context(unsigned long ea)
 	 * Depending on Kernel config, kernel region can have one context
 	 * or more.
 	 */
-	if (region_id == KERNEL_REGION_ID) {
+	if (region_id == LINEAR_MAP_REGION_ID) {
 		/*
 		 * We already verified ea to be not beyond the addr limit.
 		 */
diff --git a/arch/powerpc/mm/copro_fault.c b/arch/powerpc/mm/copro_fault.c
index 9b0321061bc8..f137286740cb 100644
--- a/arch/powerpc/mm/copro_fault.c
+++ b/arch/powerpc/mm/copro_fault.c
@@ -129,8 +129,8 @@ int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb)
 		vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
 		vsidkey = SLB_VSID_KERNEL;
 		break;
-	case KERNEL_REGION_ID:
-		pr_devel("%s: 0x%llx -- KERNEL_REGION_ID\n", __func__, ea);
+	case LINEAR_MAP_REGION_ID:
+		pr_devel("%s: 0x%llx -- LINEAR_MAP_REGION_ID\n", __func__, ea);
 		psize = mmu_linear_psize;
 		ssize = mmu_kernel_ssize;
 		vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c
index a0c37f428d60..2c4e01781c10 100644
--- a/arch/powerpc/mm/slb.c
+++ b/arch/powerpc/mm/slb.c
@@ -691,7 +691,7 @@ static long slb_allocate_kernel(unsigned long ea, unsigned long id)
 	unsigned long flags;
 	int ssize;
 
-	if (id == KERNEL_REGION_ID) {
+	if (id == LINEAR_MAP_REGION_ID) {
 
 		/* We only support upto MAX_PHYSMEM_BITS */
 		if ((ea & EA_MASK) > (1UL << MAX_PHYSMEM_BITS))
@@ -790,7 +790,7 @@ long do_slb_fault(struct pt_regs *regs, unsigned long ea)
 	 * first class kernel code. But for performance it's probably nicer
 	 * if they go via fast_exception_return too.
 	 */
-	if (id >= KERNEL_REGION_ID) {
+	if (id >= LINEAR_MAP_REGION_ID) {
 		long err;
 #ifdef CONFIG_DEBUG_VM
 		/* Catch recursive kernel SLB faults. */
diff --git a/arch/powerpc/platforms/cell/spu_base.c b/arch/powerpc/platforms/cell/spu_base.c
index 4770cce1bfe2..6646f152d57b 100644
--- a/arch/powerpc/platforms/cell/spu_base.c
+++ b/arch/powerpc/platforms/cell/spu_base.c
@@ -224,7 +224,7 @@ static void __spu_kernel_slb(void *addr, struct copro_slb *slb)
 	unsigned long ea = (unsigned long)addr;
 	u64 llp;
 
-	if (get_region_id(ea) == KERNEL_REGION_ID)
+	if (get_region_id(ea) == LINEAR_MAP_REGION_ID)
 		llp = mmu_psize_defs[mmu_linear_psize].sllp;
 	else
 		llp = mmu_psize_defs[mmu_virtual_psize].sllp;
-- 
2.20.1

[PATCH v4 8/8] powerpc/mm/hash/4K: Update the vmalloc start for hash 4K config

[Aneesh Kumar K.V]

This updates hash 4k VMALLOC_START to 0xc008000000000000. Our page table
still limit max addr to 64TB. But with hash translation we map only
vmalloc and IO region and we ignore top bits (0xc008) when mapping the
addr to page table. That means VMALLOC_START get mapped as 0 addr on
linux page table.

With this we have for 4K

 kernel vmalloc start   = 0xc008000000000000
 kernel IO start        = 0xc008100000000000
 kernel vmemmap start   = 0xc008200000000000

64K hash, 64K radix and 4k radix:

  kernel vmalloc start   = 0xc008000000000000
  kernel IO start        = 0xc00a000000000000
  kernel vmemmap start   = 0xc00c000000000000

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
 arch/powerpc/include/asm/book3s/64/hash-4k.h  |  8 +++++++-
 arch/powerpc/include/asm/book3s/64/hash-64k.h |  2 +-
 arch/powerpc/include/asm/book3s/64/mmu-hash.h | 11 +++++------
 arch/powerpc/include/asm/book3s/64/mmu.h      |  9 ++++++++-
 4 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/hash-4k.h b/arch/powerpc/include/asm/book3s/64/hash-4k.h
index 64eaf187f891..73058c933560 100644
--- a/arch/powerpc/include/asm/book3s/64/hash-4k.h
+++ b/arch/powerpc/include/asm/book3s/64/hash-4k.h
@@ -26,7 +26,13 @@
  * Define the address range of the kernel non-linear virtual area
  * 16TB
  */
-#define H_KERN_VIRT_START	ASM_CONST(0xc000100000000000)
+#define H_KERN_VIRT_START	ASM_CONST(0xc008000000000000)
+/*
+ * Even though we use 2PB address here, For mapping to linux
+ * page table we ignore these bits. Hash only map vmalloc
+ * and I/O region in linux page table.
+ */
+#define H_KERN_EA_MASK		ASM_CONST(~0xc008000000000000)
 
 #ifndef __ASSEMBLY__
 #define H_PTE_TABLE_SIZE	(sizeof(pte_t) << H_PTE_INDEX_SIZE)
diff --git a/arch/powerpc/include/asm/book3s/64/hash-64k.h b/arch/powerpc/include/asm/book3s/64/hash-64k.h
index 24ca63beba14..0d0ea957bdfd 100644
--- a/arch/powerpc/include/asm/book3s/64/hash-64k.h
+++ b/arch/powerpc/include/asm/book3s/64/hash-64k.h
@@ -24,7 +24,7 @@
  * 2PB
  */
 #define H_KERN_VIRT_START	ASM_CONST(0xc008000000000000)
-
+#define H_KERN_EA_MASK		ASM_CONST(~0xc000000000000000)
 /*
  * 64k aligned address free up few of the lower bits of RPN for us
  * We steal that here. For more deatils look at pte_pfn/pfn_pte()
diff --git a/arch/powerpc/include/asm/book3s/64/mmu-hash.h b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
index 5d2adf3c1325..8be2cbbf8ef2 100644
--- a/arch/powerpc/include/asm/book3s/64/mmu-hash.h
+++ b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
@@ -742,12 +742,6 @@ static inline unsigned long get_vsid(unsigned long context, unsigned long ea,
 	unsigned long vsid_bits;
 	unsigned long protovsid;
 
-	/*
-	 * Bad address. We return VSID 0 for that
-	 */
-	if ((ea & EA_MASK)  >= H_PGTABLE_RANGE)
-		return 0;
-
 	if (!mmu_has_feature(MMU_FTR_68_BIT_VA))
 		va_bits = 65;
 
@@ -807,6 +801,11 @@ static inline unsigned long get_kernel_vsid(unsigned long ea, int ssize)
 
 	if (!is_kernel_addr(ea))
 		return 0;
+	/*
+	 * Bad address. We return VSID 0 for that
+	 */
+	if ((ea & H_KERN_EA_MASK) >= H_PGTABLE_RANGE)
+		return 0;
 
 	context = get_kernel_context(ea);
 	return get_vsid(context, ea, ssize);
diff --git a/arch/powerpc/include/asm/book3s/64/mmu.h b/arch/powerpc/include/asm/book3s/64/mmu.h
index 1ceee000c18d..cab8deb2501e 100644
--- a/arch/powerpc/include/asm/book3s/64/mmu.h
+++ b/arch/powerpc/include/asm/book3s/64/mmu.h
@@ -232,8 +232,15 @@ static inline int get_user_context(mm_context_t *ctx, unsigned long ea)
 static inline unsigned long get_user_vsid(mm_context_t *ctx,
 					  unsigned long ea, int ssize)
 {
-	unsigned long context = get_user_context(ctx, ea);
+	unsigned long context;
 
+	/*
+	 * Bad address. We return VSID 0 for that
+	 */
+	if (ea >= H_PGTABLE_RANGE)
+		return 0;
+
+	context = get_user_context(ctx, ea);
 	return get_vsid(context, ea, ssize);
 }
 
-- 
2.20.1

Re: [PATCH v4 2/8] powerpc/mm/hash64: Map all the kernel regions in the same 0xc range

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 5459 bytes --]

Hi "Aneesh,

I love your patch! Yet something to improve:

[auto build test ERROR on powerpc/next]
[also build test ERROR on v5.1-rc5 next-20190417]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Aneesh-Kumar-K-V/Update-hash-MMU-kernel-mapping-to-be-in-sync-with-radix/20190417-223135
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-pseries_defconfig (attached as .config)
compiler: powerpc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.2.0 make.cross ARCH=powerpc 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>


All error/warnings (new ones prefixed by >>):

   In file included from include/linux/kernel.h:11:0,
                    from arch/powerpc/mm/pgtable-radix.c:14:
   arch/powerpc/mm/pgtable-radix.c: In function '__map_kernel_page':
>> include/linux/compiler.h:344:38: error: call to '__compiletime_assert_139' declared with attribute error: BUILD_BUG_ON failed: RADIX_KERN_MAP_SIZE != MAX_EA_BITS_PER_CONTEXT
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
                                         ^
   include/linux/compiler.h:325:4: note: in definition of macro '__compiletime_assert'
       prefix ## suffix();    \
       ^~~~~~
   include/linux/compiler.h:344:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
     ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
    #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                        ^~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
     BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
     ^~~~~~~~~~~~~~~~
>> arch/powerpc/mm/pgtable-radix.c:139:2: note: in expansion of macro 'BUILD_BUG_ON'
     BUILD_BUG_ON(RADIX_KERN_MAP_SIZE != MAX_EA_BITS_PER_CONTEXT);
     ^~~~~~~~~~~~
--
   In file included from include/linux/kernel.h:11:0,
                    from arch/powerpc//mm/pgtable-radix.c:14:
   arch/powerpc//mm/pgtable-radix.c: In function '__map_kernel_page':
>> include/linux/compiler.h:344:38: error: call to '__compiletime_assert_139' declared with attribute error: BUILD_BUG_ON failed: RADIX_KERN_MAP_SIZE != MAX_EA_BITS_PER_CONTEXT
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
                                         ^
   include/linux/compiler.h:325:4: note: in definition of macro '__compiletime_assert'
       prefix ## suffix();    \
       ^~~~~~
   include/linux/compiler.h:344:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
     ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
    #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                        ^~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
     BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
     ^~~~~~~~~~~~~~~~
   arch/powerpc//mm/pgtable-radix.c:139:2: note: in expansion of macro 'BUILD_BUG_ON'
     BUILD_BUG_ON(RADIX_KERN_MAP_SIZE != MAX_EA_BITS_PER_CONTEXT);
     ^~~~~~~~~~~~

vim +/__compiletime_assert_139 +344 include/linux/compiler.h

9a8ab1c3 Daniel Santos 2013-02-21  330  
9a8ab1c3 Daniel Santos 2013-02-21  331  #define _compiletime_assert(condition, msg, prefix, suffix) \
9a8ab1c3 Daniel Santos 2013-02-21  332  	__compiletime_assert(condition, msg, prefix, suffix)
9a8ab1c3 Daniel Santos 2013-02-21  333  
9a8ab1c3 Daniel Santos 2013-02-21  334  /**
9a8ab1c3 Daniel Santos 2013-02-21  335   * compiletime_assert - break build and emit msg if condition is false
9a8ab1c3 Daniel Santos 2013-02-21  336   * @condition: a compile-time constant condition to check
9a8ab1c3 Daniel Santos 2013-02-21  337   * @msg:       a message to emit if condition is false
9a8ab1c3 Daniel Santos 2013-02-21  338   *
9a8ab1c3 Daniel Santos 2013-02-21  339   * In tradition of POSIX assert, this macro will break the build if the
9a8ab1c3 Daniel Santos 2013-02-21  340   * supplied condition is *false*, emitting the supplied error message if the
9a8ab1c3 Daniel Santos 2013-02-21  341   * compiler has support to do so.
9a8ab1c3 Daniel Santos 2013-02-21  342   */
9a8ab1c3 Daniel Santos 2013-02-21  343  #define compiletime_assert(condition, msg) \
9a8ab1c3 Daniel Santos 2013-02-21 @344  	_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
9a8ab1c3 Daniel Santos 2013-02-21  345  

:::::: The code at line 344 was first introduced by commit
:::::: 9a8ab1c39970a4938a72d94e6fd13be88a797590 bug.h, compiler.h: introduce compiletime_assert & BUILD_BUG_ON_MSG

:::::: TO: Daniel Santos <daniel.santos@pobox.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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Re: [PATCH v4 2/8] powerpc/mm/hash64: Map all the kernel regions in the same 0xc range

[Aneesh Kumar K.V]

On 4/17/19 6:29 PM, Aneesh Kumar K.V wrote:
> This patch maps vmalloc, IO and vmemap regions in the 0xc address range
> instead of the current 0xd and 0xf range. This brings the mapping closer
> to radix translation mode.
> 
> With hash 64K page size each of this region is 512TB whereas with 4K config
> we are limited by the max page table range of 64TB and hence there regions
> are of 16TB size.
> 
> The kernel mapping is now:
> 
>   On 4K hash
> 
>       kernel_region_map_size = 16TB
>       kernel vmalloc start   = 0xc000100000000000
>       kernel IO start        = 0xc000200000000000
>       kernel vmemmap start   = 0xc000300000000000
> 
> 64K hash, 64K radix and 4k radix:
> 
>       kernel_region_map_size = 512TB
>       kernel vmalloc start   = 0xc008000000000000
>       kernel IO start        = 0xc00a000000000000
>       kernel vmemmap start   = 0xc00c000000000000

I missed this when sending out the patch.

diff --git a/arch/powerpc/mm/pgtable-radix.c 
b/arch/powerpc/mm/pgtable-radix.c
index 263c3ff662c3..30fc0909f1d8 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -136,7 +136,7 @@ static int __map_kernel_page(unsigned long ea, 
unsigned long pa,
         BUILD_BUG_ON(TASK_SIZE_USER64 > RADIX_PGTABLE_RANGE);

  #ifdef CONFIG_PPC_64K_PAGES
-       BUILD_BUG_ON(RADIX_KERN_MAP_SIZE != MAX_EA_BITS_PER_CONTEXT);
+       BUILD_BUG_ON(RADIX_KERN_MAP_SIZE != (1UL << 
MAX_EA_BITS_PER_CONTEXT));
  #endif

         if (unlikely(!slab_is_available()))

Re: [v4, 1/8] powerpc/mm/hash64: Add a variable to track the end of IO mapping

[Michael Ellerman]

On Wed, 2019-04-17 at 12:59:13 UTC, "Aneesh Kumar K.V" wrote:
> This makes it easy to update the region mapping in the later patch
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>

Patches 1-7 applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/a35a3c6f60657812366fca86a9ce71df

cheers