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powerpc/64e: Reorganise virtual memory 

Reduce the size of IO map in order to leave the last
quarter of virtual MAP for KASAN shadow mapping.

This gives the following layout.

   +------------------------+  Kernel virtual map end (0xc000200000000000)
   |                        |
   |    16TB (unused)       |
   |                        |
   +------------------------+  Kernel IO map end
   |                        |
   |    16TB of IO map      |
   |                        |
   +------------------------+  Kernel IO map start
   |                        |
   |    16TB of vmemmap     |
   |                        |
   +------------------------+  Kernel vmemmap start
   |                        |
   |    16TB of vmap        |
   |                        |
   +------------------------+  Kernel virt start (0xc000100000000000)
   |                        |
   |    64TB of linear mem  |
   |                        |
   +------------------------+  Kernel linear (0xc.....)

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/54ef01673bf14228106afd629f795c83acb9a00c.1656427701.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2022-06-28 16:48:58 +02:00 committed by Michael Ellerman
parent 128c1ea2f8
commit 059c189389
1 changed files with 4 additions and 3 deletions
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7
arch/powerpc/include/asm/nohash/64/pgtable.h
View File

@ -38,15 +38,16 @@
#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
/*
* The second half of the kernel virtual space is used for IO mappings,
* The third quarter of the kernel virtual space is used for IO mappings,
* it's itself carved into the PIO region (ISA and PHB IO space) and
* the ioremap space
*
* ISA_IO_BASE = KERN_IO_START, 64K reserved area
* PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces
* IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE
* IOREMAP_BASE = ISA_IO_BASE + 2G to KERN_IO_START + KERN_IO_SIZE
*/
#define KERN_IO_START (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1))
#define KERN_IO_SIZE (KERN_VIRT_SIZE >> 2)
#define FULL_IO_SIZE 0x80000000ul
#define ISA_IO_BASE (KERN_IO_START)
#define ISA_IO_END (KERN_IO_START + 0x10000ul)
@ -54,7 +55,7 @@
#define PHB_IO_END (KERN_IO_START + FULL_IO_SIZE)
#define IOREMAP_BASE (PHB_IO_END)
#define IOREMAP_START (ioremap_bot)
#define IOREMAP_END (KERN_VIRT_START + KERN_VIRT_SIZE - FIXADDR_SIZE)
#define IOREMAP_END (KERN_IO_START + KERN_IO_SIZE - FIXADDR_SIZE)
#define FIXADDR_SIZE SZ_32M
/*