Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759235Ab0FVRbD (ORCPT ); Tue, 22 Jun 2010 13:31:03 -0400 Received: from rcsinet10.oracle.com ([148.87.113.121]:36317 "EHLO rcsinet10.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759099Ab0FVRar (ORCPT ); Tue, 22 Jun 2010 13:30:47 -0400 From: Yinghai Lu To: Ingo Molnar , Thomas Gleixner , "H. Peter Anvin" , Andrew Morton , David Miller , Benjamin Herrenschmidt Cc: Linus Torvalds , Johannes Weiner , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Yinghai Lu Subject: [PATCH 22/25] x86, lmb: Use lmb_memory_size()/lmb_free_memory_size() to get correct dma_reserve Date: Tue, 22 Jun 2010 10:26:51 -0700 Message-Id: <1277227614-11581-23-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.6.4.2 In-Reply-To: <1277227614-11581-1-git-send-email-yinghai@kernel.org> References: <1277227614-11581-1-git-send-email-yinghai@kernel.org> X-Auth-Type: Internal IP X-Source-IP: acsinet15.oracle.com [141.146.126.227] X-CT-RefId: str=0001.0A090207.4C20F329.011A,ss=1,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3170 Lines: 101 lmb_memory_size() will return memory size in lmb.memory.region. lmb_free_memory_size() will return free memory size in lmb.memory.region. So We can get exact reseved size in specified range. Set the size right after initmem_init(), because later bootmem API will get area above 16M. (except some fallback). Later after we remove the bootmem, We could call that just before paging_init(). Signed-off-by: Yinghai Lu --- arch/x86/include/asm/e820.h | 2 ++ arch/x86/kernel/e820.c | 17 +++++++++++++++++ arch/x86/kernel/setup.c | 1 + arch/x86/mm/init_64.c | 7 ------- 4 files changed, 20 insertions(+), 7 deletions(-) diff --git a/arch/x86/include/asm/e820.h b/arch/x86/include/asm/e820.h index 6fbd8cd..f59db16 100644 --- a/arch/x86/include/asm/e820.h +++ b/arch/x86/include/asm/e820.h @@ -118,6 +118,8 @@ extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align); void init_lmb_memory(void); void fill_lmb_memory(void); +void find_lmb_dma_reserve(void); + extern void finish_e820_parsing(void); extern void e820_reserve_resources(void); extern void e820_reserve_resources_late(void); diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index c8edb78..c09b84b 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -1110,3 +1110,20 @@ void __init fill_lmb_memory(void) lmb_analyze(); lmb_dump_all(); } + +void __init find_lmb_dma_reserve(void) +{ +#ifdef CONFIG_X86_64 + u64 free_size_pfn; + u64 mem_size_pfn; + /* + * need to find out used area below MAX_DMA_PFN + * need to use lmb to get free size in [0, MAX_DMA_PFN] + * at first, and assume boot_mem will not take below MAX_DMA_PFN + */ + mem_size_pfn = lmb_memory_in_range(0, MAX_DMA_PFN << PAGE_SHIFT) >> PAGE_SHIFT; + free_size_pfn = lmb_free_memory_in_range(0, MAX_DMA_PFN << PAGE_SHIFT) >> PAGE_SHIFT; + set_dma_reserve(mem_size_pfn - free_size_pfn); +#endif +} + diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index ba3f94c..426b217 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -1019,6 +1019,7 @@ void __init setup_arch(char **cmdline_p) #endif initmem_init(0, max_pfn, acpi, k8); + find_lmb_dma_reserve(); #ifndef CONFIG_NO_BOOTMEM lmb_to_bootmem(0, max_low_pfn< #include -static unsigned long dma_reserve __initdata; - static int __init parse_direct_gbpages_off(char *arg) { direct_gbpages = 0; @@ -821,11 +819,6 @@ int __init reserve_bootmem_generic(unsigned long phys, unsigned long len, reserve_bootmem(phys, len, flags); - if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { - dma_reserve += len / PAGE_SIZE; - set_dma_reserve(dma_reserve); - } - return 0; } #endif -- 1.6.4.2 -- 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/