powerpc/mm: Move book3s64 specifics in subdirectory mm/book3s64

Many files in arch/powerpc/mm are only for book3S64. This patch
creates a subdirectory for them.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[mpe: Update the selftest sym links, shorten new filenames, cleanup some
      whitespace and formatting in the new files.]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 0 insertions, 263 deletions

diff --git a/arch/powerpc/mm/mmu_context_book3s64.c b/arch/powerpc/mm/mmu_context_book3s64.c
deleted file mode 100644
index cb2b08635508..000000000000
--- a/arch/powerpc/mm/mmu_context_book3s64.c
+++ /dev/null
@@ -1,263 +0,0 @@
-/*
- *  MMU context allocation for 64-bit kernels.
- *
- *  Copyright (C) 2004 Anton Blanchard, IBM Corp. <anton@samba.org>
- *
- *  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; either version
- *  2 of the License, or (at your option) any later version.
- *
- */
-
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/types.h>
-#include <linux/mm.h>
-#include <linux/pkeys.h>
-#include <linux/spinlock.h>
-#include <linux/idr.h>
-#include <linux/export.h>
-#include <linux/gfp.h>
-#include <linux/slab.h>
-
-#include <asm/mmu_context.h>
-#include <asm/pgalloc.h>
-
-static DEFINE_IDA(mmu_context_ida);
-
-static int alloc_context_id(int min_id, int max_id)
-{
-	return ida_alloc_range(&mmu_context_ida, min_id, max_id, GFP_KERNEL);
-}
-
-void hash__reserve_context_id(int id)
-{
-	int result = ida_alloc_range(&mmu_context_ida, id, id, GFP_KERNEL);
-
-	WARN(result != id, "mmu: Failed to reserve context id %d (rc %d)\n", id, result);
-}
-
-int hash__alloc_context_id(void)
-{
-	unsigned long max;
-
-	if (mmu_has_feature(MMU_FTR_68_BIT_VA))
-		max = MAX_USER_CONTEXT;
-	else
-		max = MAX_USER_CONTEXT_65BIT_VA;
-
-	return alloc_context_id(MIN_USER_CONTEXT, max);
-}
-EXPORT_SYMBOL_GPL(hash__alloc_context_id);
-
-void slb_setup_new_exec(void);
-
-static int hash__init_new_context(struct mm_struct *mm)
-{
-	int index;
-
-	index = hash__alloc_context_id();
-	if (index < 0)
-		return index;
-
-	mm->context.hash_context = kmalloc(sizeof(struct hash_mm_context),
-					   GFP_KERNEL);
-	if (!mm->context.hash_context) {
-		ida_free(&mmu_context_ida, index);
-		return -ENOMEM;
-	}
-
-	/*
-	 * The old code would re-promote on fork, we don't do that when using
-	 * slices as it could cause problem promoting slices that have been
-	 * forced down to 4K.
-	 *
-	 * For book3s we have MMU_NO_CONTEXT set to be ~0. Hence check
-	 * explicitly against context.id == 0. This ensures that we properly
-	 * initialize context slice details for newly allocated mm's (which will
-	 * have id == 0) and don't alter context slice inherited via fork (which
-	 * will have id != 0).
-	 *
-	 * We should not be calling init_new_context() on init_mm. Hence a
-	 * check against 0 is OK.
-	 */
-	if (mm->context.id == 0) {
-		memset(mm->context.hash_context, 0, sizeof(struct hash_mm_context));
-		slice_init_new_context_exec(mm);
-	} else {
-		/* This is fork. Copy hash_context details from current->mm */
-		memcpy(mm->context.hash_context, current->mm->context.hash_context, sizeof(struct hash_mm_context));
-#ifdef CONFIG_PPC_SUBPAGE_PROT
-		/* inherit subpage prot detalis if we have one. */
-		if (current->mm->context.hash_context->spt) {
-			mm->context.hash_context->spt = kmalloc(sizeof(struct subpage_prot_table),
-								GFP_KERNEL);
-			if (!mm->context.hash_context->spt) {
-				ida_free(&mmu_context_ida, index);
-				kfree(mm->context.hash_context);
-				return -ENOMEM;
-			}
-		}
-#endif
-
-	}
-
-	pkey_mm_init(mm);
-	return index;
-}
-
-void hash__setup_new_exec(void)
-{
-	slice_setup_new_exec();
-
-	slb_setup_new_exec();
-}
-
-static int radix__init_new_context(struct mm_struct *mm)
-{
-	unsigned long rts_field;
-	int index, max_id;
-
-	max_id = (1 << mmu_pid_bits) - 1;
-	index = alloc_context_id(mmu_base_pid, max_id);
-	if (index < 0)
-		return index;
-
-	/*
-	 * set the process table entry,
-	 */
-	rts_field = radix__get_tree_size();
-	process_tb[index].prtb0 = cpu_to_be64(rts_field | __pa(mm->pgd) | RADIX_PGD_INDEX_SIZE);
-
-	/*
-	 * Order the above store with subsequent update of the PID
-	 * register (at which point HW can start loading/caching
-	 * the entry) and the corresponding load by the MMU from
-	 * the L2 cache.
-	 */
-	asm volatile("ptesync;isync" : : : "memory");
-
-	mm->context.npu_context = NULL;
-	mm->context.hash_context = NULL;
-
-	return index;
-}
-
-int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
-{
-	int index;
-
-	if (radix_enabled())
-		index = radix__init_new_context(mm);
-	else
-		index = hash__init_new_context(mm);
-
-	if (index < 0)
-		return index;
-
-	mm->context.id = index;
-
-	mm->context.pte_frag = NULL;
-	mm->context.pmd_frag = NULL;
-#ifdef CONFIG_SPAPR_TCE_IOMMU
-	mm_iommu_init(mm);
-#endif
-	atomic_set(&mm->context.active_cpus, 0);
-	atomic_set(&mm->context.copros, 0);
-
-	return 0;
-}
-
-void __destroy_context(int context_id)
-{
-	ida_free(&mmu_context_ida, context_id);
-}
-EXPORT_SYMBOL_GPL(__destroy_context);
-
-static void destroy_contexts(mm_context_t *ctx)
-{
-	int index, context_id;
-
-	for (index = 0; index < ARRAY_SIZE(ctx->extended_id); index++) {
-		context_id = ctx->extended_id[index];
-		if (context_id)
-			ida_free(&mmu_context_ida, context_id);
-	}
-	kfree(ctx->hash_context);
-}
-
-static void pmd_frag_destroy(void *pmd_frag)
-{
-	int count;
-	struct page *page;
-
-	page = virt_to_page(pmd_frag);
-	/* drop all the pending references */
-	count = ((unsigned long)pmd_frag & ~PAGE_MASK) >> PMD_FRAG_SIZE_SHIFT;
-	/* We allow PTE_FRAG_NR fragments from a PTE page */
-	if (atomic_sub_and_test(PMD_FRAG_NR - count, &page->pt_frag_refcount)) {
-		pgtable_pmd_page_dtor(page);
-		__free_page(page);
-	}
-}
-
-static void destroy_pagetable_cache(struct mm_struct *mm)
-{
-	void *frag;
-
-	frag = mm->context.pte_frag;
-	if (frag)
-		pte_frag_destroy(frag);
-
-	frag = mm->context.pmd_frag;
-	if (frag)
-		pmd_frag_destroy(frag);
-	return;
-}
-
-void destroy_context(struct mm_struct *mm)
-{
-#ifdef CONFIG_SPAPR_TCE_IOMMU
-	WARN_ON_ONCE(!list_empty(&mm->context.iommu_group_mem_list));
-#endif
-	if (radix_enabled())
-		WARN_ON(process_tb[mm->context.id].prtb0 != 0);
-	else
-		subpage_prot_free(mm);
-	destroy_contexts(&mm->context);
-	mm->context.id = MMU_NO_CONTEXT;
-}
-
-void arch_exit_mmap(struct mm_struct *mm)
-{
-	destroy_pagetable_cache(mm);
-
-	if (radix_enabled()) {
-		/*
-		 * Radix doesn't have a valid bit in the process table
-		 * entries. However we know that at least P9 implementation
-		 * will avoid caching an entry with an invalid RTS field,
-		 * and 0 is invalid. So this will do.
-		 *
-		 * This runs before the "fullmm" tlb flush in exit_mmap,
-		 * which does a RIC=2 tlbie to clear the process table
-		 * entry. See the "fullmm" comments in tlb-radix.c.
-		 *
-		 * No barrier required here after the store because
-		 * this process will do the invalidate, which starts with
-		 * ptesync.
-		 */
-		process_tb[mm->context.id].prtb0 = 0;
-	}
-}
-
-#ifdef CONFIG_PPC_RADIX_MMU
-void radix__switch_mmu_context(struct mm_struct *prev, struct mm_struct *next)
-{
-	mtspr(SPRN_PID, next->context.id);
-	isync();
-}
-#endif