Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755483AbaDKILJ (ORCPT ); Fri, 11 Apr 2014 04:11:09 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:58206 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750892AbaDKIKM (ORCPT ); Fri, 11 Apr 2014 04:10:12 -0400 From: Liu Hua To: CC: , , , , , , , , Liu Hua Subject: [PATCH v2 2/2] ARM : change fixmap mapping region to support 32 CPUs Date: Fri, 11 Apr 2014 16:00:52 +0800 Message-ID: <1397203252-22977-3-git-send-email-sdu.liu@huawei.com> X-Mailer: git-send-email 1.9.0 In-Reply-To: <1397203252-22977-1-git-send-email-sdu.liu@huawei.com> References: <1397203252-22977-1-git-send-email-sdu.liu@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.197.247] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In 32-bit ARM systems, the fixmap mapping region can support no more than 14 CPUs(total: 896k; one CPU: 64K). And we can configure NR_CPUS up to 32. So there is a mismatch. This patch moves fixmapping region downwards to region 0xffc00000-0xffe00000 . Then the fixmap mapping region can support up to 32 CPUs. Signed-off-by: Liu Hua --- Documentation/arm/memory.txt | 2 +- arch/arm/include/asm/fixmap.h | 4 ++-- arch/arm/include/asm/highmem.h | 1 + arch/arm/mm/highmem.c | 10 +++++----- arch/arm/mm/mm.h | 7 +++++++ arch/arm/mm/mmu.c | 4 ++++ mm/highmem.c | 1 + 7 files changed, 21 insertions(+), 8 deletions(-) diff --git a/Documentation/arm/memory.txt b/Documentation/arm/memory.txt index 8a361c0..4bca737 100644 --- a/Documentation/arm/memory.txt +++ b/Documentation/arm/memory.txt @@ -41,7 +41,7 @@ fffe8000 fffeffff DTCM mapping area for platforms with fffe0000 fffe7fff ITCM mapping area for platforms with ITCM mounted inside the CPU. -fff00000 fffdffff Fixmap mapping region. Addresses provided +ffc00000 ffdfffff Fixmap mapping region. Addresses provided by fix_to_virt() will be located here. ff000000 ffbfffff Reserved for future expansion of DMA diff --git a/arch/arm/include/asm/fixmap.h b/arch/arm/include/asm/fixmap.h index bbae919..014a70d 100644 --- a/arch/arm/include/asm/fixmap.h +++ b/arch/arm/include/asm/fixmap.h @@ -13,8 +13,8 @@ * 0xfffe0000 and 0xfffeffff. */ -#define FIXADDR_START 0xfff00000UL -#define FIXADDR_TOP 0xfffe0000UL +#define FIXADDR_START 0xffc00000UL +#define FIXADDR_TOP 0xffe00000UL #define FIXADDR_SIZE (FIXADDR_TOP - FIXADDR_START) #define FIX_KMAP_BEGIN 0 diff --git a/arch/arm/include/asm/highmem.h b/arch/arm/include/asm/highmem.h index 91b99ab..5355795 100644 --- a/arch/arm/include/asm/highmem.h +++ b/arch/arm/include/asm/highmem.h @@ -18,6 +18,7 @@ } while (0) extern pte_t *pkmap_page_table; +extern pte_t *fixmap_page_table; extern void *kmap_high(struct page *page); extern void kunmap_high(struct page *page); diff --git a/arch/arm/mm/highmem.c b/arch/arm/mm/highmem.c index 21b9e1b..9bc8988 100644 --- a/arch/arm/mm/highmem.c +++ b/arch/arm/mm/highmem.c @@ -69,14 +69,14 @@ void *kmap_atomic(struct page *page) * With debugging enabled, kunmap_atomic forces that entry to 0. * Make sure it was indeed properly unmapped. */ - BUG_ON(!pte_none(get_top_pte(vaddr))); + BUG_ON(!pte_none(*(fixmap_page_table + idx))); #endif /* * When debugging is off, kunmap_atomic leaves the previous mapping * in place, so the contained TLB flush ensures the TLB is updated * with the new mapping. */ - set_top_pte(vaddr, mk_pte(page, kmap_prot)); + set_fixmap_pte(idx, mk_pte(page, kmap_prot)); return (void *)vaddr; } @@ -95,7 +95,7 @@ void __kunmap_atomic(void *kvaddr) __cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE); #ifdef CONFIG_DEBUG_HIGHMEM BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx)); - set_top_pte(vaddr, __pte(0)); + set_fixmap_pte(idx, __pte(0)); #else (void) idx; /* to kill a warning */ #endif @@ -119,9 +119,9 @@ void *kmap_atomic_pfn(unsigned long pfn) idx = type + KM_TYPE_NR * smp_processor_id(); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); #ifdef CONFIG_DEBUG_HIGHMEM - BUG_ON(!pte_none(get_top_pte(vaddr))); + BUG_ON(!pte_none(*(fixmap_page_table + idx))); #endif - set_top_pte(vaddr, pfn_pte(pfn, kmap_prot)); + set_fixmap_pte(idx, pfn_pte(pfn, kmap_prot)); return (void *)vaddr; } diff --git a/arch/arm/mm/mm.h b/arch/arm/mm/mm.h index 7ea641b..3460d73 100644 --- a/arch/arm/mm/mm.h +++ b/arch/arm/mm/mm.h @@ -1,6 +1,7 @@ #ifdef CONFIG_MMU #include #include +#include /* the upper-most page table pointer */ extern pmd_t *top_pmd; @@ -25,6 +26,12 @@ static inline void set_top_pte(unsigned long va, pte_t pte) local_flush_tlb_kernel_page(va); } +static inline void set_fixmap_pte(int idx, pte_t pte) +{ + unsigned long vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); + set_pte_ext(fixmap_page_table + idx, pte, 0); + local_flush_tlb_kernel_page(vaddr); +} static inline pte_t get_top_pte(unsigned long va) { pte_t *ptep = pte_offset_kernel(top_pmd, va); diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index b68c6b2..09c0a16 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -35,6 +35,7 @@ #include #include #include +#include #include "mm.h" #include "tcm.h" @@ -1359,6 +1360,9 @@ static void __init kmap_init(void) #ifdef CONFIG_HIGHMEM pkmap_page_table = early_pte_alloc(pmd_off_k(PKMAP_BASE), PKMAP_BASE, _PAGE_KERNEL_TABLE); + + fixmap_page_table = early_pte_alloc(pmd_off_k(FIXADDR_START), + FIXADDR_START, _PAGE_KERNEL_TABLE); #endif } diff --git a/mm/highmem.c b/mm/highmem.c index b32b70c..d0094ba 100644 --- a/mm/highmem.c +++ b/mm/highmem.c @@ -72,6 +72,7 @@ static unsigned int last_pkmap_nr; static __cacheline_aligned_in_smp DEFINE_SPINLOCK(kmap_lock); pte_t * pkmap_page_table; +pte_t *fixmap_page_table; static DECLARE_WAIT_QUEUE_HEAD(pkmap_map_wait); -- 1.9.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/