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There are situations when memory regions coming from dts may be too big for the platform physical address space. This especially concerns XPA-capable systems. Bootloader may determine more than 4GB memory available and pass it to the kernel over dts memory node, while kernel is built without XPA/64BIT support. In this case the region may either simply be truncated by add_memory_region() method or by u64->phys_addr_t type casting. But in worst case the method can even drop the memory region if it exceeds PHYS_ADDR_MAX size. So lets make sure the retrieved from dts memory regions are valid, and if some of them aren't, just manually truncate them with a warning printed out. Signed-off-by: Serge Semin <fancer.lancer@gmail.com> Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: James Hogan <jhogan@kernel.org> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Thomas Bogendoerfer <tbogendoerfer@suse.de> Cc: Huacai Chen <chenhc@lemote.com> Cc: Stefan Agner <stefan@agner.ch> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Cc: Juergen Gross <jgross@suse.com> Cc: Serge Semin <Sergey.Semin@t-platforms.ru> Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org
96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
/*
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* MIPS support for CONFIG_OF device tree support
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*
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* Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/export.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/memblock.h>
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#include <linux/debugfs.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <linux/of_platform.h>
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#include <asm/bootinfo.h>
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#include <asm/page.h>
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#include <asm/prom.h>
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static char mips_machine_name[64] = "Unknown";
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__init void mips_set_machine_name(const char *name)
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{
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if (name == NULL)
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return;
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strlcpy(mips_machine_name, name, sizeof(mips_machine_name));
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pr_info("MIPS: machine is %s\n", mips_get_machine_name());
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}
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char *mips_get_machine_name(void)
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{
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return mips_machine_name;
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}
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#ifdef CONFIG_USE_OF
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void __init early_init_dt_add_memory_arch(u64 base, u64 size)
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{
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if (base >= PHYS_ADDR_MAX) {
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pr_warn("Trying to add an invalid memory region, skipped\n");
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return;
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}
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/* Truncate the passed memory region instead of type casting */
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if (base + size - 1 >= PHYS_ADDR_MAX || base + size < base) {
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pr_warn("Truncate memory region %llx @ %llx to size %llx\n",
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size, base, PHYS_ADDR_MAX - base);
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size = PHYS_ADDR_MAX - base;
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}
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add_memory_region(base, size, BOOT_MEM_RAM);
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}
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int __init early_init_dt_reserve_memory_arch(phys_addr_t base,
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phys_addr_t size, bool nomap)
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{
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add_memory_region(base, size,
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nomap ? BOOT_MEM_NOMAP : BOOT_MEM_RESERVED);
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return 0;
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}
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void __init __dt_setup_arch(void *bph)
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{
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if (!early_init_dt_scan(bph))
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return;
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mips_set_machine_name(of_flat_dt_get_machine_name());
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}
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int __init __dt_register_buses(const char *bus0, const char *bus1)
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{
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static struct of_device_id of_ids[3];
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if (!of_have_populated_dt())
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panic("device tree not present");
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strlcpy(of_ids[0].compatible, bus0, sizeof(of_ids[0].compatible));
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if (bus1) {
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strlcpy(of_ids[1].compatible, bus1,
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sizeof(of_ids[1].compatible));
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}
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if (of_platform_populate(NULL, of_ids, NULL, NULL))
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panic("failed to populate DT");
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return 0;
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}
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#endif
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