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https://github.com/edk2-porting/linux-next.git
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3e4d3af501
Keep the current interface but ignore the KM_type and use a stack based approach. The advantage is that we get rid of crappy code like: #define __KM_PTE \ (in_nmi() ? KM_NMI_PTE : \ in_irq() ? KM_IRQ_PTE : \ KM_PTE0) and in general can stop worrying about what context we're in and what kmap slots might be appropriate for that. The downside is that FRV kmap_atomic() gets more expensive. For now we use a CPP trick suggested by Andrew: #define kmap_atomic(page, args...) __kmap_atomic(page) to avoid having to touch all kmap_atomic() users in a single patch. [ not compiled on: - mn10300: the arch doesn't actually build with highmem to begin with ] [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: fix up drivers/gpu/drm/i915/intel_overlay.c] Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Chris Metcalf <cmetcalf@tilera.com> Cc: David Howells <dhowells@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: David Miller <davem@davemloft.net> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Dave Airlie <airlied@linux.ie> Cc: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/* cache-page.c: whole-page cache wrangling functions for MMU linux
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*
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* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/highmem.h>
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#include <linux/module.h>
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#include <asm/pgalloc.h>
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/*****************************************************************************/
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/*
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* DCF takes a virtual address and the page may not currently have one
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* - temporarily hijack a kmap_atomic() slot and attach the page to it
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*/
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void flush_dcache_page(struct page *page)
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{
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unsigned long dampr2;
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void *vaddr;
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dampr2 = __get_DAMPR(2);
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vaddr = kmap_atomic_primary(page, __KM_CACHE);
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frv_dcache_writeback((unsigned long) vaddr, (unsigned long) vaddr + PAGE_SIZE);
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kunmap_atomic_primary(vaddr, __KM_CACHE);
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if (dampr2) {
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__set_DAMPR(2, dampr2);
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__set_IAMPR(2, dampr2);
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}
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} /* end flush_dcache_page() */
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EXPORT_SYMBOL(flush_dcache_page);
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/*****************************************************************************/
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/*
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* ICI takes a virtual address and the page may not currently have one
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* - so we temporarily attach the page to a bit of virtual space so that is can be flushed
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*/
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void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
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unsigned long start, unsigned long len)
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{
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unsigned long dampr2;
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void *vaddr;
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dampr2 = __get_DAMPR(2);
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vaddr = kmap_atomic_primary(page, __KM_CACHE);
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start = (start & ~PAGE_MASK) | (unsigned long) vaddr;
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frv_cache_wback_inv(start, start + len);
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kunmap_atomic_primary(vaddr, __KM_CACHE);
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if (dampr2) {
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__set_DAMPR(2, dampr2);
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__set_IAMPR(2, dampr2);
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}
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} /* end flush_icache_user_range() */
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EXPORT_SYMBOL(flush_icache_user_range);
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