From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mtagate3.uk.ibm.com ([194.196.100.163]) by canuck.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1R1edA-0005Nj-Ol for kexec@lists.infradead.org; Thu, 08 Sep 2011 13:27:01 +0000 Received: from d06nrmr1307.portsmouth.uk.ibm.com (d06nrmr1307.portsmouth.uk.ibm.com [9.149.38.129]) by mtagate3.uk.ibm.com (8.13.1/8.13.1) with ESMTP id p88DQsET028015 for ; Thu, 8 Sep 2011 13:26:54 GMT Received: from d06av10.portsmouth.uk.ibm.com (d06av10.portsmouth.uk.ibm.com [9.149.37.251]) by d06nrmr1307.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p88DQrqJ2527408 for ; Thu, 8 Sep 2011 14:26:53 +0100 Received: from d06av10.portsmouth.uk.ibm.com (loopback [127.0.0.1]) by d06av10.portsmouth.uk.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p88DQqmg006445 for ; Thu, 8 Sep 2011 07:26:53 -0600 Message-Id: <20110908132652.331918517@linux.vnet.ibm.com> Date: Thu, 08 Sep 2011 15:26:11 +0200 From: Michael Holzheu Subject: [RFC][patch 2/2] s390: Add architecture code for unmapping crashkernel memory References: <20110908132609.177038405@linux.vnet.ibm.com> Content-Disposition: inline; filename=s390-kdump-arch-crash_map_pages.patch List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=twosheds.infradead.org@lists.infradead.org To: vgoyal@redhat.com Cc: linux-s390@vger.kernel.org, mahesh@linux.vnet.ibm.com, heiko.carstens@de.ibm.com, linux-kernel@vger.kernel.org, ebiederm@xmission.com, schwidefsky@de.ibm.com, kexec@lists.infradead.org From: Michael Holzheu This patch implements the crash_map_pages() function for s390. KEXEC_CRASH_MEM_ALIGN is set to HPAGE_SIZE, in order to support kernel mappings that use large pages. Signed-off-by: Michael Holzheu --- arch/s390/include/asm/kexec.h | 3 +++ arch/s390/kernel/machine_kexec.c | 15 +++++++++++++++ arch/s390/kernel/setup.c | 10 ++++++---- 3 files changed, 24 insertions(+), 4 deletions(-) --- a/arch/s390/include/asm/kexec.h +++ b/arch/s390/include/asm/kexec.h @@ -36,6 +36,9 @@ /* Allocate one page for the pdp and the second for the code */ #define KEXEC_CONTROL_PAGE_SIZE 4096 +/* Alignment of crashkernel memory */ +#define KEXEC_CRASH_MEM_ALIGN HPAGE_SIZE + /* The native architecture */ #define KEXEC_ARCH KEXEC_ARCH_S390 --- a/arch/s390/kernel/machine_kexec.c +++ b/arch/s390/kernel/machine_kexec.c @@ -243,6 +243,21 @@ static void __machine_kdump(void *image) #endif /* + * Map or unmap crashkernel memory + */ +void crash_map_pages(int enable) +{ + unsigned long size = crashk_res.end - crashk_res.start + 1; + + BUG_ON(crashk_res.start % KEXEC_CRASH_MEM_ALIGN || + size % KEXEC_CRASH_MEM_ALIGN); + if (enable) + vmem_add_mapping(crashk_res.start, size); + else + vmem_remove_mapping(crashk_res.start, size); +} + +/* * Give back memory to hypervisor before new kdump is loaded */ static int machine_kexec_prepare_kdump(void) --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -446,6 +446,7 @@ static void __init setup_resources(void) res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; switch (memory_chunk[i].type) { case CHUNK_READ_WRITE: + case CHUNK_CRASHK: res->name = "System RAM"; break; case CHUNK_READ_ONLY: @@ -706,8 +707,8 @@ static void __init reserve_crashkernel(v &crash_base); if (rc || crash_size == 0) return; - crash_base = PAGE_ALIGN(crash_base); - crash_size = PAGE_ALIGN(crash_size); + crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); + crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); if (register_memory_notifier(&kdump_mem_nb)) return; if (!crash_base) @@ -727,7 +728,7 @@ static void __init reserve_crashkernel(v crashk_res.start = crash_base; crashk_res.end = crash_base + crash_size - 1; insert_resource(&iomem_resource, &crashk_res); - reserve_kdump_bootmem(crash_base, crash_size, CHUNK_READ_WRITE); + reserve_kdump_bootmem(crash_base, crash_size, CHUNK_CRASHK); pr_info("Reserving %lluMB of memory at %lluMB " "for crashkernel (System RAM: %luMB)\n", crash_size >> 20, crash_base >> 20, memory_end >> 20); @@ -802,7 +803,8 @@ setup_memory(void) for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { unsigned long start_chunk, end_chunk, pfn; - if (memory_chunk[i].type != CHUNK_READ_WRITE) + if (memory_chunk[i].type != CHUNK_READ_WRITE && + memory_chunk[i].type != CHUNK_CRASHK) continue; start_chunk = PFN_DOWN(memory_chunk[i].addr); end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size); _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-Id: <20110908132652.331918517@linux.vnet.ibm.com> Date: Thu, 08 Sep 2011 15:26:11 +0200 From: Michael Holzheu Subject: [RFC][patch 2/2] s390: Add architecture code for unmapping crashkernel memory References: <20110908132609.177038405@linux.vnet.ibm.com> Content-Disposition: inline; filename=s390-kdump-arch-crash_map_pages.patch Sender: linux-kernel-owner@vger.kernel.org List-Archive: List-Post: To: vgoyal@redhat.com Cc: ebiederm@xmission.com, mahesh@linux.vnet.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org List-ID: From: Michael Holzheu This patch implements the crash_map_pages() function for s390. KEXEC_CRASH_MEM_ALIGN is set to HPAGE_SIZE, in order to support kernel mappings that use large pages. Signed-off-by: Michael Holzheu --- arch/s390/include/asm/kexec.h | 3 +++ arch/s390/kernel/machine_kexec.c | 15 +++++++++++++++ arch/s390/kernel/setup.c | 10 ++++++---- 3 files changed, 24 insertions(+), 4 deletions(-) --- a/arch/s390/include/asm/kexec.h +++ b/arch/s390/include/asm/kexec.h @@ -36,6 +36,9 @@ /* Allocate one page for the pdp and the second for the code */ #define KEXEC_CONTROL_PAGE_SIZE 4096 +/* Alignment of crashkernel memory */ +#define KEXEC_CRASH_MEM_ALIGN HPAGE_SIZE + /* The native architecture */ #define KEXEC_ARCH KEXEC_ARCH_S390 --- a/arch/s390/kernel/machine_kexec.c +++ b/arch/s390/kernel/machine_kexec.c @@ -243,6 +243,21 @@ static void __machine_kdump(void *image) #endif /* + * Map or unmap crashkernel memory + */ +void crash_map_pages(int enable) +{ + unsigned long size = crashk_res.end - crashk_res.start + 1; + + BUG_ON(crashk_res.start % KEXEC_CRASH_MEM_ALIGN || + size % KEXEC_CRASH_MEM_ALIGN); + if (enable) + vmem_add_mapping(crashk_res.start, size); + else + vmem_remove_mapping(crashk_res.start, size); +} + +/* * Give back memory to hypervisor before new kdump is loaded */ static int machine_kexec_prepare_kdump(void) --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -446,6 +446,7 @@ static void __init setup_resources(void) res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; switch (memory_chunk[i].type) { case CHUNK_READ_WRITE: + case CHUNK_CRASHK: res->name = "System RAM"; break; case CHUNK_READ_ONLY: @@ -706,8 +707,8 @@ static void __init reserve_crashkernel(v &crash_base); if (rc || crash_size == 0) return; - crash_base = PAGE_ALIGN(crash_base); - crash_size = PAGE_ALIGN(crash_size); + crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); + crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); if (register_memory_notifier(&kdump_mem_nb)) return; if (!crash_base) @@ -727,7 +728,7 @@ static void __init reserve_crashkernel(v crashk_res.start = crash_base; crashk_res.end = crash_base + crash_size - 1; insert_resource(&iomem_resource, &crashk_res); - reserve_kdump_bootmem(crash_base, crash_size, CHUNK_READ_WRITE); + reserve_kdump_bootmem(crash_base, crash_size, CHUNK_CRASHK); pr_info("Reserving %lluMB of memory at %lluMB " "for crashkernel (System RAM: %luMB)\n", crash_size >> 20, crash_base >> 20, memory_end >> 20); @@ -802,7 +803,8 @@ setup_memory(void) for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { unsigned long start_chunk, end_chunk, pfn; - if (memory_chunk[i].type != CHUNK_READ_WRITE) + if (memory_chunk[i].type != CHUNK_READ_WRITE && + memory_chunk[i].type != CHUNK_CRASHK) continue; start_chunk = PFN_DOWN(memory_chunk[i].addr); end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);