| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Fri, 26 Mar 2010 15:21:53 -0700
From: Yinghai Lu <yinghai@...nel.org>
To: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
Andrew Morton <akpm@...ux-foundation.org>,
David Miller <davem@...emloft.net>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Johannes Weiner <hannes@...xchg.org>, linux-kernel@...r.kernel.org,
linux-arch@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 23/24] x86, lmb: Use lmb_memory_size()/lmb_free_memory_size() to get correct dma_reserve
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.
Set the size right after initmem_init(), because later bootmem API will
get area from 16M. (except some fallback).
Later after we remove the bootmem, We could call that just before paging_init().
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
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 de6cd06..334281f 100644
--- a/arch/x86/include/asm/e820.h
+++ b/arch/x86/include/asm/e820.h
@@ -117,6 +117,8 @@ 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 78ba396..e0257b8 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -1100,3 +1100,20 @@ 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_size(0, MAX_DMA_PFN << PAGE_SHIFT) >> PAGE_SHIFT;
+ free_size_pfn = lmb_free_memory_size(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 f0a32a4..6b62d9b 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -979,6 +979,7 @@ 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<<PAGE_SHIFT);
#endif
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index b86492e..f1af41c 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -52,8 +52,6 @@
#include <asm/init.h>
#include <linux/bootmem.h>
-static unsigned long dma_reserve __initdata;
-
static int __init parse_direct_gbpages_off(char *arg)
{
direct_gbpages = 0;
@@ -820,11 +818,6 @@ 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@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists