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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/hexagon/include/asm/pgalloc.h | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/hexagon/include/asm/pgalloc.h')
-rw-r--r-- | kernel/arch/hexagon/include/asm/pgalloc.h | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/kernel/arch/hexagon/include/asm/pgalloc.h b/kernel/arch/hexagon/include/asm/pgalloc.h new file mode 100644 index 000000000..77da3b0ae --- /dev/null +++ b/kernel/arch/hexagon/include/asm/pgalloc.h @@ -0,0 +1,148 @@ +/* + * Page table support for the Hexagon architecture + * + * Copyright (c) 2010-2011, The Linux Foundation. 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 version 2 and + * only version 2 as published by the Free Software Foundation. + * + * 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. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#ifndef _ASM_PGALLOC_H +#define _ASM_PGALLOC_H + +#include <asm/mem-layout.h> +#include <asm/atomic.h> + +#define check_pgt_cache() do {} while (0) + +extern unsigned long long kmap_generation; + +/* + * Page table creation interface + */ +static inline pgd_t *pgd_alloc(struct mm_struct *mm) +{ + pgd_t *pgd; + + pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO); + + /* + * There may be better ways to do this, but to ensure + * that new address spaces always contain the kernel + * base mapping, and to ensure that the user area is + * initially marked invalid, initialize the new map + * map with a copy of the kernel's persistent map. + */ + + memcpy(pgd, swapper_pg_dir, PTRS_PER_PGD*sizeof(pgd_t)); + mm->context.generation = kmap_generation; + + /* Physical version is what is passed to virtual machine on switch */ + mm->context.ptbase = __pa(pgd); + + return pgd; +} + +static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) +{ + free_page((unsigned long) pgd); +} + +static inline struct page *pte_alloc_one(struct mm_struct *mm, + unsigned long address) +{ + struct page *pte; + + pte = alloc_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO); + if (!pte) + return NULL; + if (!pgtable_page_ctor(pte)) { + __free_page(pte); + return NULL; + } + return pte; +} + +/* _kernel variant gets to use a different allocator */ +static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, + unsigned long address) +{ + gfp_t flags = GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO; + return (pte_t *) __get_free_page(flags); +} + +static inline void pte_free(struct mm_struct *mm, struct page *pte) +{ + pgtable_page_dtor(pte); + __free_page(pte); +} + +static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) +{ + free_page((unsigned long)pte); +} + +static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, + pgtable_t pte) +{ + /* + * Conveniently, zero in 3 LSB means indirect 4K page table. + * Not so convenient when you're trying to vary the page size. + */ + set_pmd(pmd, __pmd(((unsigned long)page_to_pfn(pte) << PAGE_SHIFT) | + HEXAGON_L1_PTE_SIZE)); +} + +/* + * Other architectures seem to have ways of making all processes + * share the same pmd's for their kernel mappings, but the v0.3 + * Hexagon VM spec has a "monolithic" L1 table for user and kernel + * segments. We track "generations" of the kernel map to minimize + * overhead, and update the "slave" copies of the kernel mappings + * as part of switch_mm. However, we still need to update the + * kernel map of the active thread who's calling pmd_populate_kernel... + */ +static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, + pte_t *pte) +{ + extern spinlock_t kmap_gen_lock; + pmd_t *ppmd; + int pmdindex; + + spin_lock(&kmap_gen_lock); + kmap_generation++; + mm->context.generation = kmap_generation; + current->active_mm->context.generation = kmap_generation; + spin_unlock(&kmap_gen_lock); + + set_pmd(pmd, __pmd(((unsigned long)__pa(pte)) | HEXAGON_L1_PTE_SIZE)); + + /* + * Now the "slave" copy of the current thread. + * This is pointer arithmetic, not byte addresses! + */ + pmdindex = (pgd_t *)pmd - mm->pgd; + ppmd = (pmd_t *)current->active_mm->pgd + pmdindex; + set_pmd(ppmd, __pmd(((unsigned long)__pa(pte)) | HEXAGON_L1_PTE_SIZE)); + if (pmdindex > max_kernel_seg) + max_kernel_seg = pmdindex; +} + +#define __pte_free_tlb(tlb, pte, addr) \ +do { \ + pgtable_page_dtor((pte)); \ + tlb_remove_page((tlb), (pte)); \ +} while (0) + +#endif |