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linux/arch/tile/include/asm/page.h
Chris Metcalf 76c567fbba arch/tile: support 4KB page size as well as 64KB 
The Tilera architecture traditionally supports 64KB page sizes
to improve TLB utilization and improve performance when the
hardware is being used primarily to run a single application.

For more generic server scenarios, it can be beneficial to run
with 4KB page sizes, so this commit allows that to be specified
(by modifying the arch/tile/include/hv/pagesize.h header).

As part of this change, we also re-worked the PTE management
slightly so that PTE writes all go through a __set_pte() function
where we can do some additional validation.  The set_pte_order()
function was eliminated since the "order" argument wasn't being used.

One bug uncovered was in the PCI DMA code, which wasn't properly
flushing the specified range.  This was benign with 64KB pages,
but with 4KB pages we were getting some larger flushes wrong.

The per-cpu memory reservation code also needed updating to
conform with the newer percpu stuff; before it always chose 64KB,
and that was always correct, but with 4KB granularity we now have
to pay closer attention and reserve the amount of memory that will
be requested when the percpu code starts allocating.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2011-03-10 13:17:53 -05:00

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/*
* Copyright 2010 Tilera Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*/
#ifndef _ASM_TILE_PAGE_H
#define _ASM_TILE_PAGE_H
#include <linux/const.h>
#include <hv/pagesize.h>
/* PAGE_SHIFT and HPAGE_SHIFT determine the page sizes. */
#define PAGE_SHIFT HV_LOG2_PAGE_SIZE_SMALL
#define HPAGE_SHIFT HV_LOG2_PAGE_SIZE_LARGE
#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
#define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE - 1))
#define HPAGE_MASK (~(HPAGE_SIZE - 1))
#ifdef __KERNEL__
/*
* If the Kconfig doesn't specify, set a maximum zone order that
* is enough so that we can create huge pages from small pages given
* the respective sizes of the two page types. See <linux/mmzone.h>.
*/
#ifndef CONFIG_FORCE_MAX_ZONEORDER
#define CONFIG_FORCE_MAX_ZONEORDER (HPAGE_SHIFT - PAGE_SHIFT + 1)
#endif
#include <hv/hypervisor.h>
#include <arch/chip.h>
#ifndef __ASSEMBLY__
#include <linux/types.h>
#include <linux/string.h>
struct page;
static inline void clear_page(void *page)
{
memset(page, 0, PAGE_SIZE);
}
static inline void copy_page(void *to, void *from)
{
memcpy(to, from, PAGE_SIZE);
}
static inline void clear_user_page(void *page, unsigned long vaddr,
struct page *pg)
{
clear_page(page);
}
static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
struct page *topage)
{
copy_page(to, from);
}
/*
* Hypervisor page tables are made of the same basic structure.
*/
typedef HV_PTE pte_t;
typedef HV_PTE pgd_t;
typedef HV_PTE pgprot_t;
/*
* User L2 page tables are managed as one L2 page table per page,
* because we use the page allocator for them. This keeps the allocation
* simple and makes it potentially useful to implement HIGHPTE at some point.
* However, it's also inefficient, since L2 page tables are much smaller
* than pages (currently 2KB vs 64KB). So we should revisit this.
*/
typedef struct page *pgtable_t;
/* Must be a macro since it is used to create constants. */
#define __pgprot(val) hv_pte(val)
static inline u64 pgprot_val(pgprot_t pgprot)
{
return hv_pte_val(pgprot);
}
static inline u64 pte_val(pte_t pte)
{
return hv_pte_val(pte);
}
static inline u64 pgd_val(pgd_t pgd)
{
return hv_pte_val(pgd);
}
#ifdef __tilegx__
typedef HV_PTE pmd_t;
static inline u64 pmd_val(pmd_t pmd)
{
return hv_pte_val(pmd);
}
#endif
static inline __attribute_const__ int get_order(unsigned long size)
{
return BITS_PER_LONG - __builtin_clzl((size - 1) >> PAGE_SHIFT);
}
#endif /* !__ASSEMBLY__ */
#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
#define HUGE_MAX_HSTATE 2
#ifdef CONFIG_HUGETLB_PAGE
#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
#endif
/* Each memory controller has PAs distinct in their high bits. */
#define NR_PA_HIGHBIT_SHIFT (CHIP_PA_WIDTH() - CHIP_LOG_NUM_MSHIMS())
#define NR_PA_HIGHBIT_VALUES (1 << CHIP_LOG_NUM_MSHIMS())
#define __pa_to_highbits(pa) ((phys_addr_t)(pa) >> NR_PA_HIGHBIT_SHIFT)
#define __pfn_to_highbits(pfn) ((pfn) >> (NR_PA_HIGHBIT_SHIFT - PAGE_SHIFT))
#ifdef __tilegx__
/*
* We reserve the lower half of memory for user-space programs, and the
* upper half for system code. We re-map all of physical memory in the
* upper half, which takes a quarter of our VA space. Then we have
* the vmalloc regions. The supervisor code lives at 0xfffffff700000000,
* with the hypervisor above that.
*
* Loadable kernel modules are placed immediately after the static
* supervisor code, with each being allocated a 256MB region of
* address space, so we don't have to worry about the range of "jal"
* and other branch instructions.
*
* For now we keep life simple and just allocate one pmd (4GB) for vmalloc.
* Similarly, for now we don't play any struct page mapping games.
*/
#if CHIP_PA_WIDTH() + 2 > CHIP_VA_WIDTH()
# error Too much PA to map with the VA available!
#endif
#define HALF_VA_SPACE (_AC(1, UL) << (CHIP_VA_WIDTH() - 1))
#define MEM_LOW_END (HALF_VA_SPACE - 1) /* low half */
#define MEM_HIGH_START (-HALF_VA_SPACE) /* high half */
#define PAGE_OFFSET MEM_HIGH_START
#define _VMALLOC_START _AC(0xfffffff500000000, UL) /* 4 GB */
#define HUGE_VMAP_BASE _AC(0xfffffff600000000, UL) /* 4 GB */
#define MEM_SV_START _AC(0xfffffff700000000, UL) /* 256 MB */
#define MEM_SV_INTRPT MEM_SV_START
#define MEM_MODULE_START _AC(0xfffffff710000000, UL) /* 256 MB */
#define MEM_MODULE_END (MEM_MODULE_START + (256*1024*1024))
#define MEM_HV_START _AC(0xfffffff800000000, UL) /* 32 GB */
/* Highest DTLB address we will use */
#define KERNEL_HIGH_VADDR MEM_SV_START
/* Since we don't currently provide any fixmaps, we use an impossible VA. */
#define FIXADDR_TOP MEM_HV_START
#else /* !__tilegx__ */
/*
* A PAGE_OFFSET of 0xC0000000 means that the kernel has
* a virtual address space of one gigabyte, which limits the
* amount of physical memory you can use to about 768MB.
* If you want more physical memory than this then see the CONFIG_HIGHMEM
* option in the kernel configuration.
*
* The top 16MB chunk in the table below is unavailable to Linux. Since
* the kernel interrupt vectors must live at ether 0xfe000000 or 0xfd000000
* (depending on whether the kernel is at PL2 or Pl1), we map all of the
* bottom of RAM at this address with a huge page table entry to minimize
* its ITLB footprint (as well as at PAGE_OFFSET). The last architected
* requirement is that user interrupt vectors live at 0xfc000000, so we
* make that range of memory available to user processes. The remaining
* regions are sized as shown; the first four addresses use the PL 1
* values, and after that, we show "typical" values, since the actual
* addresses depend on kernel #defines.
*
* MEM_HV_INTRPT 0xfe000000
* MEM_SV_INTRPT (kernel code) 0xfd000000
* MEM_USER_INTRPT (user vector) 0xfc000000
* FIX_KMAP_xxx 0xf8000000 (via NR_CPUS * KM_TYPE_NR)
* PKMAP_BASE 0xf7000000 (via LAST_PKMAP)
* HUGE_VMAP 0xf3000000 (via CONFIG_NR_HUGE_VMAPS)
* VMALLOC_START 0xf0000000 (via __VMALLOC_RESERVE)
* mapped LOWMEM 0xc0000000
*/
#define MEM_USER_INTRPT _AC(0xfc000000, UL)
#if CONFIG_KERNEL_PL == 1
#define MEM_SV_INTRPT _AC(0xfd000000, UL)
#define MEM_HV_INTRPT _AC(0xfe000000, UL)
#else
#define MEM_GUEST_INTRPT _AC(0xfd000000, UL)
#define MEM_SV_INTRPT _AC(0xfe000000, UL)
#define MEM_HV_INTRPT _AC(0xff000000, UL)
#endif
#define INTRPT_SIZE 0x4000
/* Tolerate page size larger than the architecture interrupt region size. */
#if PAGE_SIZE > INTRPT_SIZE
#undef INTRPT_SIZE
#define INTRPT_SIZE PAGE_SIZE
#endif
#define KERNEL_HIGH_VADDR MEM_USER_INTRPT
#define FIXADDR_TOP (KERNEL_HIGH_VADDR - PAGE_SIZE)
#define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
/* On 32-bit architectures we mix kernel modules in with other vmaps. */
#define MEM_MODULE_START VMALLOC_START
#define MEM_MODULE_END VMALLOC_END
#endif /* __tilegx__ */
#ifndef __ASSEMBLY__
#ifdef CONFIG_HIGHMEM
/* Map kernel virtual addresses to page frames, in HPAGE_SIZE chunks. */
extern unsigned long pbase_map[];
extern void *vbase_map[];
static inline unsigned long kaddr_to_pfn(const volatile void *_kaddr)
{
unsigned long kaddr = (unsigned long)_kaddr;
return pbase_map[kaddr >> HPAGE_SHIFT] +
((kaddr & (HPAGE_SIZE - 1)) >> PAGE_SHIFT);
}
static inline void *pfn_to_kaddr(unsigned long pfn)
{
return vbase_map[__pfn_to_highbits(pfn)] + (pfn << PAGE_SHIFT);
}
static inline phys_addr_t virt_to_phys(const volatile void *kaddr)
{
unsigned long pfn = kaddr_to_pfn(kaddr);
return ((phys_addr_t)pfn << PAGE_SHIFT) +
((unsigned long)kaddr & (PAGE_SIZE-1));
}
static inline void *phys_to_virt(phys_addr_t paddr)
{
return pfn_to_kaddr(paddr >> PAGE_SHIFT) + (paddr & (PAGE_SIZE-1));
}
/* With HIGHMEM, we pack PAGE_OFFSET through high_memory with all valid VAs. */
static inline int virt_addr_valid(const volatile void *kaddr)
{
extern void *high_memory; /* copied from <linux/mm.h> */
return ((unsigned long)kaddr >= PAGE_OFFSET && kaddr < high_memory);
}
#else /* !CONFIG_HIGHMEM */
static inline unsigned long kaddr_to_pfn(const volatile void *kaddr)
{
return ((unsigned long)kaddr - PAGE_OFFSET) >> PAGE_SHIFT;
}
static inline void *pfn_to_kaddr(unsigned long pfn)
{
return (void *)((pfn << PAGE_SHIFT) + PAGE_OFFSET);
}
static inline phys_addr_t virt_to_phys(const volatile void *kaddr)
{
return (phys_addr_t)((unsigned long)kaddr - PAGE_OFFSET);
}
static inline void *phys_to_virt(phys_addr_t paddr)
{
return (void *)((unsigned long)paddr + PAGE_OFFSET);
}
/* Check that the given address is within some mapped range of PAs. */
#define virt_addr_valid(kaddr) pfn_valid(kaddr_to_pfn(kaddr))
#endif /* !CONFIG_HIGHMEM */
/* All callers are not consistent in how they call these functions. */
#define __pa(kaddr) virt_to_phys((void *)(unsigned long)(kaddr))
#define __va(paddr) phys_to_virt((phys_addr_t)(paddr))
extern int devmem_is_allowed(unsigned long pagenr);
#ifdef CONFIG_FLATMEM
static inline int pfn_valid(unsigned long pfn)
{
return pfn < max_mapnr;
}
#endif
/* Provide as macros since these require some other headers included. */
#define page_to_pa(page) ((phys_addr_t)(page_to_pfn(page)) << PAGE_SHIFT)
#define virt_to_page(kaddr) pfn_to_page(kaddr_to_pfn(kaddr))
#define page_to_virt(page) pfn_to_kaddr(page_to_pfn(page))
struct mm_struct;
extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
#endif /* !__ASSEMBLY__ */
#define VM_DATA_DEFAULT_FLAGS \
(VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
#include <asm-generic/memory_model.h>
#endif /* __KERNEL__ */
#endif /* _ASM_TILE_PAGE_H */
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