![Mahesh Salgaonkar](/assets/img/avatar_default.png)
The current logic sets the kdump base to min of 2G or ppc64_rma_size/2. On PowerNV kernel the first memory block 'memory@0' can be very large, equal to the DIMM size with ppc64_rma_size value capped to 1G. Hence on PowerNV, kdump base is set to 512M resulting kdump to fail while allocating paca array. This is because, paca need its memory from RMA region capped at 256M (see allocate_pacas()). This patch lowers the kdump base cap to 128M so that kdump kernel can successfully get memory below 256M for paca allocation. Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
276 lines
6.9 KiB
C
276 lines
6.9 KiB
C
/*
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* Code to handle transition of Linux booting another kernel.
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*
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* Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
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* GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
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* Copyright (C) 2005 IBM Corporation.
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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*/
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#include <linux/kexec.h>
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#include <linux/reboot.h>
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#include <linux/threads.h>
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#include <linux/memblock.h>
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#include <linux/of.h>
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#include <linux/irq.h>
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#include <linux/ftrace.h>
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#include <asm/machdep.h>
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#include <asm/pgalloc.h>
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#include <asm/prom.h>
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#include <asm/sections.h>
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void machine_kexec_mask_interrupts(void) {
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unsigned int i;
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struct irq_desc *desc;
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for_each_irq_desc(i, desc) {
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struct irq_chip *chip;
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chip = irq_desc_get_chip(desc);
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if (!chip)
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continue;
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if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
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chip->irq_eoi(&desc->irq_data);
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if (chip->irq_mask)
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chip->irq_mask(&desc->irq_data);
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if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
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chip->irq_disable(&desc->irq_data);
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}
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}
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void machine_crash_shutdown(struct pt_regs *regs)
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{
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default_machine_crash_shutdown(regs);
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}
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/*
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* Do what every setup is needed on image and the
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* reboot code buffer to allow us to avoid allocations
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* later.
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*/
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int machine_kexec_prepare(struct kimage *image)
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{
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if (ppc_md.machine_kexec_prepare)
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return ppc_md.machine_kexec_prepare(image);
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else
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return default_machine_kexec_prepare(image);
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}
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void machine_kexec_cleanup(struct kimage *image)
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{
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}
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void arch_crash_save_vmcoreinfo(void)
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{
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#ifdef CONFIG_NEED_MULTIPLE_NODES
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VMCOREINFO_SYMBOL(node_data);
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VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
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#endif
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#ifndef CONFIG_NEED_MULTIPLE_NODES
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VMCOREINFO_SYMBOL(contig_page_data);
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#endif
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#if defined(CONFIG_PPC64) && defined(CONFIG_SPARSEMEM_VMEMMAP)
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VMCOREINFO_SYMBOL(vmemmap_list);
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VMCOREINFO_SYMBOL(mmu_vmemmap_psize);
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VMCOREINFO_SYMBOL(mmu_psize_defs);
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VMCOREINFO_STRUCT_SIZE(vmemmap_backing);
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VMCOREINFO_OFFSET(vmemmap_backing, list);
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VMCOREINFO_OFFSET(vmemmap_backing, phys);
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VMCOREINFO_OFFSET(vmemmap_backing, virt_addr);
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VMCOREINFO_STRUCT_SIZE(mmu_psize_def);
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VMCOREINFO_OFFSET(mmu_psize_def, shift);
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#endif
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}
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/*
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* Do not allocate memory (or fail in any way) in machine_kexec().
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* We are past the point of no return, committed to rebooting now.
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*/
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void machine_kexec(struct kimage *image)
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{
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int save_ftrace_enabled;
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save_ftrace_enabled = __ftrace_enabled_save();
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if (ppc_md.machine_kexec)
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ppc_md.machine_kexec(image);
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else
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default_machine_kexec(image);
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__ftrace_enabled_restore(save_ftrace_enabled);
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/* Fall back to normal restart if we're still alive. */
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machine_restart(NULL);
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for(;;);
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}
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void __init reserve_crashkernel(void)
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{
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unsigned long long crash_size, crash_base;
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int ret;
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/* use common parsing */
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ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
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&crash_size, &crash_base);
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if (ret == 0 && crash_size > 0) {
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crashk_res.start = crash_base;
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crashk_res.end = crash_base + crash_size - 1;
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}
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if (crashk_res.end == crashk_res.start) {
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crashk_res.start = crashk_res.end = 0;
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return;
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}
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/* We might have got these values via the command line or the
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* device tree, either way sanitise them now. */
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crash_size = resource_size(&crashk_res);
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#ifndef CONFIG_NONSTATIC_KERNEL
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if (crashk_res.start != KDUMP_KERNELBASE)
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printk("Crash kernel location must be 0x%x\n",
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KDUMP_KERNELBASE);
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crashk_res.start = KDUMP_KERNELBASE;
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#else
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if (!crashk_res.start) {
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#ifdef CONFIG_PPC64
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/*
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* On 64bit we split the RMO in half but cap it at half of
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* a small SLB (128MB) since the crash kernel needs to place
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* itself and some stacks to be in the first segment.
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*/
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crashk_res.start = min(0x8000000ULL, (ppc64_rma_size / 2));
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#else
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crashk_res.start = KDUMP_KERNELBASE;
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#endif
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}
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crash_base = PAGE_ALIGN(crashk_res.start);
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if (crash_base != crashk_res.start) {
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printk("Crash kernel base must be aligned to 0x%lx\n",
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PAGE_SIZE);
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crashk_res.start = crash_base;
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}
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#endif
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crash_size = PAGE_ALIGN(crash_size);
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crashk_res.end = crashk_res.start + crash_size - 1;
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/* The crash region must not overlap the current kernel */
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if (overlaps_crashkernel(__pa(_stext), _end - _stext)) {
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printk(KERN_WARNING
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"Crash kernel can not overlap current kernel\n");
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crashk_res.start = crashk_res.end = 0;
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return;
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}
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/* Crash kernel trumps memory limit */
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if (memory_limit && memory_limit <= crashk_res.end) {
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memory_limit = crashk_res.end + 1;
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printk("Adjusted memory limit for crashkernel, now 0x%llx\n",
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memory_limit);
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}
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printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
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"for crashkernel (System RAM: %ldMB)\n",
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(unsigned long)(crash_size >> 20),
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(unsigned long)(crashk_res.start >> 20),
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(unsigned long)(memblock_phys_mem_size() >> 20));
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memblock_reserve(crashk_res.start, crash_size);
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}
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int overlaps_crashkernel(unsigned long start, unsigned long size)
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{
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return (start + size) > crashk_res.start && start <= crashk_res.end;
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}
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/* Values we need to export to the second kernel via the device tree. */
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static phys_addr_t kernel_end;
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static phys_addr_t crashk_size;
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static struct property kernel_end_prop = {
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.name = "linux,kernel-end",
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.length = sizeof(phys_addr_t),
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.value = &kernel_end,
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};
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static struct property crashk_base_prop = {
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.name = "linux,crashkernel-base",
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.length = sizeof(phys_addr_t),
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.value = &crashk_res.start,
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};
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static struct property crashk_size_prop = {
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.name = "linux,crashkernel-size",
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.length = sizeof(phys_addr_t),
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.value = &crashk_size,
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};
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static struct property memory_limit_prop = {
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.name = "linux,memory-limit",
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.length = sizeof(unsigned long long),
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.value = &memory_limit,
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};
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static void __init export_crashk_values(struct device_node *node)
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{
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struct property *prop;
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/* There might be existing crash kernel properties, but we can't
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* be sure what's in them, so remove them. */
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prop = of_find_property(node, "linux,crashkernel-base", NULL);
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if (prop)
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of_remove_property(node, prop);
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prop = of_find_property(node, "linux,crashkernel-size", NULL);
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if (prop)
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of_remove_property(node, prop);
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if (crashk_res.start != 0) {
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of_add_property(node, &crashk_base_prop);
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crashk_size = resource_size(&crashk_res);
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of_add_property(node, &crashk_size_prop);
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}
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/*
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* memory_limit is required by the kexec-tools to limit the
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* crash regions to the actual memory used.
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*/
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of_update_property(node, &memory_limit_prop);
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}
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static int __init kexec_setup(void)
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{
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struct device_node *node;
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struct property *prop;
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node = of_find_node_by_path("/chosen");
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if (!node)
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return -ENOENT;
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/* remove any stale properties so ours can be found */
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prop = of_find_property(node, kernel_end_prop.name, NULL);
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if (prop)
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of_remove_property(node, prop);
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/* information needed by userspace when using default_machine_kexec */
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kernel_end = __pa(_end);
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of_add_property(node, &kernel_end_prop);
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export_crashk_values(node);
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of_node_put(node);
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return 0;
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}
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late_initcall(kexec_setup);
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