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arch/tile: Allow tilegx to build with either 16K or 64K page size

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This change introduces new flags for the hv_install_context()
API that passes a page table pointer to the hypervisor.  Clients
can explicitly request 4K, 16K, or 64K small pages when they
install a new context.  In practice, the page size is fixed at
kernel compile time and the same size is always requested every
time a new page table is installed.

The <hv/hypervisor.h> header changes so that it provides more abstract
macros for managing "page" things like PFNs and page tables.  For
example there is now a HV_DEFAULT_PAGE_SIZE_SMALL instead of the old
HV_PAGE_SIZE_SMALL.  The various PFN routines have been eliminated and
only PA- or PTFN-based ones remain (since PTFNs are always expressed
in fixed 2KB "page" size).  The page-table management macros are
renamed with a leading underscore and take page-size arguments with
the presumption that clients will use those macros in some single
place to provide the "real" macros they will use themselves.

I happened to notice the old hv_set_caching() API was totally broken
(it assumed 4KB pages) so I changed it so it would nominally work
correctly with other page sizes.

Tag modules with the page size so you can't load a module built with
a conflicting page size.  (And add a test for SMP while we're at it.)

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf
2012-03-29 13:58:43 -04:00
parent 47d632f9f8
commit d5d14ed6f2
20 changed files with 345 additions and 197 deletions
Download Patch File Download Diff File Expand all files Collapse all files

92
arch/tile/include/asm/pgalloc.h
View File

@@ -19,24 +19,24 @@
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <asm/fixmap.h>
#include <asm/page.h>
#include <hv/hypervisor.h>
/* Bits for the size of the second-level page table. */
#define L2_KERNEL_PGTABLE_SHIFT \
(HV_LOG2_PAGE_SIZE_LARGE - HV_LOG2_PAGE_SIZE_SMALL + HV_LOG2_PTE_SIZE)
#define L2_KERNEL_PGTABLE_SHIFT _HV_LOG2_L2_SIZE(HPAGE_SHIFT, PAGE_SHIFT)
/* How big is a kernel L2 page table? */
#define L2_KERNEL_PGTABLE_SIZE (1UL << L2_KERNEL_PGTABLE_SHIFT)
/* We currently allocate user L2 page tables by page (unlike kernel L2s). */
#if L2_KERNEL_PGTABLE_SHIFT < HV_LOG2_PAGE_SIZE_SMALL
#define L2_USER_PGTABLE_SHIFT HV_LOG2_PAGE_SIZE_SMALL
#if L2_KERNEL_PGTABLE_SHIFT < PAGE_SHIFT
#define L2_USER_PGTABLE_SHIFT PAGE_SHIFT
#else
#define L2_USER_PGTABLE_SHIFT L2_KERNEL_PGTABLE_SHIFT
#endif
/* How many pages do we need, as an "order", for a user L2 page table? */
#define L2_USER_PGTABLE_ORDER (L2_USER_PGTABLE_SHIFT - HV_LOG2_PAGE_SIZE_SMALL)
/* How big is a kernel L2 page table? */
#define L2_KERNEL_PGTABLE_SIZE (1 << L2_KERNEL_PGTABLE_SHIFT)
#define L2_USER_PGTABLE_ORDER (L2_USER_PGTABLE_SHIFT - PAGE_SHIFT)
static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
{
@@ -50,14 +50,14 @@ static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
static inline void pmd_populate_kernel(struct mm_struct *mm,
pmd_t *pmd, pte_t *ptep)
{
set_pmd(pmd, ptfn_pmd(__pa(ptep) >> HV_LOG2_PAGE_TABLE_ALIGN,
set_pmd(pmd, ptfn_pmd(HV_CPA_TO_PTFN(__pa(ptep)),
__pgprot(_PAGE_PRESENT)));
}
static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
pgtable_t page)
{
set_pmd(pmd, ptfn_pmd(HV_PFN_TO_PTFN(page_to_pfn(page)),
set_pmd(pmd, ptfn_pmd(HV_CPA_TO_PTFN(PFN_PHYS(page_to_pfn(page))),
__pgprot(_PAGE_PRESENT)));
}
@@ -68,8 +68,20 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
extern pgd_t *pgd_alloc(struct mm_struct *mm);
extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
extern pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address);
extern void pte_free(struct mm_struct *mm, struct page *pte);
extern pgtable_t pgtable_alloc_one(struct mm_struct *mm, unsigned long address,
int order);
extern void pgtable_free(struct mm_struct *mm, struct page *pte, int order);
static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
unsigned long address)
{
return pgtable_alloc_one(mm, address, L2_USER_PGTABLE_ORDER);
}
static inline void pte_free(struct mm_struct *mm, struct page *pte)
{
pgtable_free(mm, pte, L2_USER_PGTABLE_ORDER);
}
#define pmd_pgtable(pmd) pmd_page(pmd)
@@ -85,8 +97,13 @@ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
pte_free(mm, virt_to_page(pte));
}
extern void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
unsigned long address);
extern void __pgtable_free_tlb(struct mmu_gather *tlb, struct page *pte,
unsigned long address, int order);
static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
unsigned long address)
{
__pgtable_free_tlb(tlb, pte, address, L2_USER_PGTABLE_ORDER);
}
#define check_pgt_cache() do { } while (0)
@@ -104,19 +121,44 @@ void shatter_pmd(pmd_t *pmd);
void shatter_huge_page(unsigned long addr);
#ifdef __tilegx__
/* We share a single page allocator for both L1 and L2 page tables. */
#if HV_L1_SIZE != HV_L2_SIZE
# error Rework assumption that L1 and L2 page tables are same size.
#endif
#define L1_USER_PGTABLE_ORDER L2_USER_PGTABLE_ORDER
#define pud_populate(mm, pud, pmd) \
pmd_populate_kernel((mm), (pmd_t *)(pud), (pte_t *)(pmd))
#define pmd_alloc_one(mm, addr) \
((pmd_t *)page_to_virt(pte_alloc_one((mm), (addr))))
#define pmd_free(mm, pmdp) \
pte_free((mm), virt_to_page(pmdp))
#define __pmd_free_tlb(tlb, pmdp, address) \
__pte_free_tlb((tlb), virt_to_page(pmdp), (address))
/* Bits for the size of the L1 (intermediate) page table. */
#define L1_KERNEL_PGTABLE_SHIFT _HV_LOG2_L1_SIZE(HPAGE_SHIFT)
/* How big is a kernel L2 page table? */
#define L1_KERNEL_PGTABLE_SIZE (1UL << L1_KERNEL_PGTABLE_SHIFT)
/* We currently allocate L1 page tables by page. */
#if L1_KERNEL_PGTABLE_SHIFT < PAGE_SHIFT
#define L1_USER_PGTABLE_SHIFT PAGE_SHIFT
#else
#define L1_USER_PGTABLE_SHIFT L1_KERNEL_PGTABLE_SHIFT
#endif
/* How many pages do we need, as an "order", for an L1 page table? */
#define L1_USER_PGTABLE_ORDER (L1_USER_PGTABLE_SHIFT - PAGE_SHIFT)
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
{
struct page *p = pgtable_alloc_one(mm, address, L1_USER_PGTABLE_ORDER);
return (pmd_t *)page_to_virt(p);
}
static inline void pmd_free(struct mm_struct *mm, pmd_t *pmdp)
{
pgtable_free(mm, virt_to_page(pmdp), L1_USER_PGTABLE_ORDER);
}
static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
unsigned long address)
{
__pgtable_free_tlb(tlb, virt_to_page(pmdp), address,
L1_USER_PGTABLE_ORDER);
}
#endif /* __tilegx__ */
#endif /* _ASM_TILE_PGALLOC_H */