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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_MMU_CONTEXT_H
#define _ASM_TILE_MMU_CONTEXT_H

#include <linux/smp.h>
#include <linux/mm_types.h>

#include <asm/setup.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/homecache.h>
#include <asm-generic/mm_hooks.h>

static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
	return 0;
}

/*
 * Note that arch/tile/kernel/head_NN.S and arch/tile/mm/migrate_NN.S
 * also call hv_install_context().
 */
static inline void __install_page_table(pgd_t *pgdir, int asid, pgprot_t prot)
{
	/* FIXME: DIRECTIO should not always be set. FIXME. */
	int rc = hv_install_context(__pa(pgdir), prot, asid,
				    HV_CTX_DIRECTIO | CTX_PAGE_FLAG);
	if (rc < 0)
		panic("hv_install_context failed: %d", rc);
}

static inline void install_page_table(pgd_t *pgdir, int asid)
{
	pte_t *ptep = virt_to_kpte((unsigned long)pgdir);
	__install_page_table(pgdir, asid, *ptep);
}

/*
 * "Lazy" TLB mode is entered when we are switching to a kernel task,
 * which borrows the mm of the previous task.  The goal of this
 * optimization is to avoid having to install a new page table.  On
 * early x86 machines (where the concept originated) you couldn't do
 * anything short of a full page table install for invalidation, so
 * handling a remote TLB invalidate required doing a page table
 * re-install.  Someone clearly decided that it was silly to keep
 * doing this while in "lazy" TLB mode, so the optimization involves
 * installing the swapper page table instead the first time one
 * occurs, and clearing the cpu out of cpu_vm_mask, so the cpu running
 * the kernel task doesn't need to take any more interrupts.  At that
 * point it's then necessary to explicitly reinstall it when context
 * switching back to the original mm.
 *
 * On Tile, we have to do a page-table install whenever DMA is enabled,
 * so in that case lazy mode doesn't help anyway.  And more generally,
 * we have efficient per-page TLB shootdown, and don't expect to spend
 * that much time in kernel tasks in general, so just leaving the
 * kernel task borrowing the old page table, but handling TLB
 * shootdowns, is a reasonable thing to do.  And importantly, this
 * lets us use the hypervisor's internal APIs for TLB shootdown, which
 * means we don't have to worry about having TLB shootdowns blocked
 * when Linux is disabling interrupts; see the page migration code for
 * an example of where it's important for TLB shootdowns to complete
 * even when interrupts are disabled at the Linux level.
 */
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *t)
{
#if CHIP_HAS_TILE_DMA()
	/*
	 * We have to do an "identity" page table switch in order to
	 * clear any pending DMA interrupts.
	 */
	if (current->thread.tile_dma_state.enabled)
		install_page_table(mm->pgd, __this_cpu_read(current_asid));
#endif
}

static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
			     struct task_struct *tsk)
{
	if (likely(prev != next)) {

		int cpu = smp_processor_id();

		/* Pick new ASID. */
		int asid = __this_cpu_read(current_asid) + 1;
		if (asid > max_asid) {
			asid = min_asid;
			local_flush_tlb();
		}
		__this_cpu_write(current_asid, asid);

		/* Clear cpu from the old mm, and set it in the new one. */
		cpumask_clear_cpu(cpu, mm_cpumask(prev));
		cpumask_set_cpu(cpu, mm_cpumask(next));

		/* Re-load page tables */
		install_page_table(next->pgd, asid);

		/* See how we should set the red/black cache info */
		check_mm_caching(prev, next);

		/*
		 * Since we're changing to a new mm, we have to flush
		 * the icache in case some physical page now being mapped
		 * has subsequently been repurposed and has new code.
		 */
		__flush_icache();

	}
}

static inline void activate_mm(struct mm_struct *prev_mm,
			       struct mm_struct *next_mm)
{
	switch_mm(prev_mm, next_mm, NULL);
}

#define destroy_context(mm)		do { } while (0)
#define deactivate_mm(tsk, mm)          do { } while (0)

#endif /* _ASM_TILE_MMU_CONTEXT_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 439 B 0644
asm-offsets.h File 35 B 0644
atomic.h File 5.14 KB 0644
atomic_32.h File 8.91 KB 0644
atomic_64.h File 5.51 KB 0644
backtrace.h File 3.98 KB 0644
barrier.h File 2.89 KB 0644
bitops.h File 2.37 KB 0644
bitops_32.h File 4.01 KB 0644
bitops_64.h File 2.67 KB 0644
cache.h File 2.6 KB 0644
cacheflush.h File 4.94 KB 0644
checksum.h File 1.23 KB 0644
cmpxchg.h File 3.47 KB 0644
compat.h File 7.38 KB 0644
current.h File 947 B 0644
delay.h File 1.1 KB 0644
device.h File 978 B 0644
div64.h File 319 B 0644
dma-mapping.h File 1.82 KB 0644
dma.h File 762 B 0644
elf.h File 5.42 KB 0644
fixmap.h File 2.73 KB 0644
ftrace.h File 1.08 KB 0644
futex.h File 4.23 KB 0644
hardirq.h File 1.28 KB 0644
hardwall.h File 1.08 KB 0644
highmem.h File 2.08 KB 0644
homecache.h File 4.21 KB 0644
hugetlb.h File 3.04 KB 0644
hv_driver.h File 1.92 KB 0644
ide.h File 758 B 0644
insn.h File 1.79 KB 0644
io.h File 12.43 KB 0644
irq.h File 3.11 KB 0644
irq_work.h File 283 B 0644
irqflags.h File 10.55 KB 0644
jump_label.h File 1.47 KB 0644
kdebug.h File 769 B 0644
kexec.h File 2.23 KB 0644
kgdb.h File 1.99 KB 0644
kmap_types.h File 1.02 KB 0644
kprobes.h File 2.19 KB 0644
linkage.h File 1.46 KB 0644
mmu.h File 965 B 0644
mmu_context.h File 4.5 KB 0644
mmzone.h File 2.07 KB 0644
module.h File 1.12 KB 0644
page.h File 10.32 KB 0644
pci.h File 6.58 KB 0644
percpu.h File 1.79 KB 0644
perf_event.h File 766 B 0644
pgalloc.h File 4.76 KB 0644
pgtable.h File 15.66 KB 0644
pgtable_32.h File 4.08 KB 0644
pgtable_64.h File 5.11 KB 0644
pmc.h File 2.15 KB 0644
processor.h File 10.62 KB 0644
ptrace.h File 2.96 KB 0644
sections.h File 1.37 KB 0644
setup.h File 1.63 KB 0644
sigframe.h File 956 B 0644
signal.h File 1.07 KB 0644
smp.h File 3.98 KB 0644
spinlock.h File 741 B 0644
spinlock_32.h File 2.9 KB 0644
spinlock_64.h File 3.88 KB 0644
spinlock_types.h File 1.58 KB 0644
stack.h File 2.59 KB 0644
string.h File 1.19 KB 0644
switch_to.h File 2.75 KB 0644
syscall.h File 2.88 KB 0644
syscalls.h File 2.35 KB 0644
thread_info.h File 5.54 KB 0644
tile-desc.h File 650 B 0644
tile-desc_32.h File 12.54 KB 0644
tile-desc_64.h File 10.83 KB 0644
timex.h File 1.71 KB 0644
tlb.h File 878 B 0644
tlbflush.h File 3.99 KB 0644
topology.h File 1.52 KB 0644
traps.h File 2.44 KB 0644
uaccess.h File 12.77 KB 0644
unaligned.h File 1.56 KB 0644
unistd.h File 777 B 0644
user.h File 717 B 0644
vdso.h File 1.84 KB 0644
vga.h File 1.05 KB 0644
word-at-a-time.h File 1.07 KB 0644