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linux_dsm_epyc7002/arch/m68k/kernel/setup_mm.c
Geert Uytterhoeven bed1369f51 m68k: Fix memblock-related crashes 
When running the kernel in Fast RAM on Atari:

    Ignoring memory chunk at 0x0:0xe00000 before the first chunk
    ...
    Unable to handle kernel NULL pointer dereference at virtual address (ptrval)
    Oops: 00000000
    Modules linked in:
    PC: [<0069dbac>] free_all_bootmem+0x12c/0x186
    SR: 2714  SP: (ptrval)  a2: 005e3314
    d0: 00000000    d1: 0000000a    d2: 00000e00    d3: 00000000
    d4: 005e1fc0    d5: 0000001a    a0: 01000000    a1: 00000000
    Process swapper (pid: 0, task=(ptrval))
    Frame format=7 eff addr=00000736 ssw=0505 faddr=00000736
    wb 1 stat/addr/data: 0000 00000000 00000000
    wb 2 stat/addr/data: 0000 00000000 00000000
    wb 3 stat/addr/data: 0000 00000736 00000000
    push data: 00000000 00000000 00000000 00000000
    Stack from 005e1f84:
            00000000 0000000a 027d3260 006b5006 00000000 00000000 00000000 00000000
            0004f062 0003a220 0069e272 005e1ff8 0000054c 00000000 00e00000 00000000
            00000001 00693cd8 027d3260 0004f062 0003a220 00691be6 00000000 00000000
            00000000 00000000 00000000 00000000 006b5006 00000000 00690872
    Call Trace: [<0004f062>] printk+0x0/0x18
     [<0003a220>] parse_args+0x0/0x2d4
     [<0069e272>] memblock_virt_alloc_try_nid+0x0/0xa4
     [<00693cd8>] mem_init+0xa/0x5c
     [<0004f062>] printk+0x0/0x18
     [<0003a220>] parse_args+0x0/0x2d4
     [<00691be6>] start_kernel+0x1ca/0x462
     [<00690872>] _sinittext+0x872/0x11f8
    Code: 7a1a eaae 2270 6db0 0061 ef14 2f01 2f03 <96a9> 0736 2203 e589 d681 e78b d6a9 0732 2f03 2f40 0034 4eb9 0069 b8d0 260e 4fef
    Disabling lock debugging due to kernel taint
    Kernel panic - not syncing: Attempted to kill the idle task!

As the kernel must run in the memory chunk with the lowest address,
ST-RAM is ignored, and removed from the m68k_memory[] array.
However, it is not removed from memblock, causing a crash later.

More investigation shows that there are 3 places where memory chunks are
ignored, all after the calls to memblock_add() in m68k_parse_bootinfo(),
and thus causing crashes:
  1. On classic m68k CPUs with a MMU, paging_init() ignores all memory
     chunks below the first chunk, cfr. above,
  2. On Amigas equipped with a Zorro III bus, config_amiga() ignores all
     Zorro II memory,
  3. If CONFIG_SINGLE_MEMORY_CHUNK=y, m68k_parse_bootinfo() ignores all
     but the first memory chunk.

Fix this by moving the calls to memblock_add() from
m68k_parse_bootinfo() to paging_init(), after all ignored memory chunks
have been removed from m68k_memory[].

Reported-by: Andreas Schwab <schwab@linux-m68k.org>
Fixes: 1008a11590 ("m68k: switch to MEMBLOCK + NO_BOOTMEM")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
2018-12-19 17:24:12 +01:00

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// SPDX-License-Identifier: GPL-2.0
/*
* linux/arch/m68k/kernel/setup.c
*
* Copyright (C) 1995 Hamish Macdonald
*/
/*
* This file handles the architecture-dependent parts of system setup
*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/console.h>
#include <linux/genhd.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/module.h>
#include <linux/initrd.h>
#include <asm/bootinfo.h>
#include <asm/byteorder.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/fpu.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/machdep.h>
#ifdef CONFIG_AMIGA
#include <asm/amigahw.h>
#endif
#ifdef CONFIG_ATARI
#include <asm/atarihw.h>
#include <asm/atari_stram.h>
#endif
#ifdef CONFIG_SUN3X
#include <asm/dvma.h>
#endif
#include <asm/natfeat.h>
#if !FPSTATESIZE || !NR_IRQS
#warning No CPU/platform type selected, your kernel will not work!
#warning Are you building an allnoconfig kernel?
#endif
unsigned long m68k_machtype;
EXPORT_SYMBOL(m68k_machtype);
unsigned long m68k_cputype;
EXPORT_SYMBOL(m68k_cputype);
unsigned long m68k_fputype;
unsigned long m68k_mmutype;
EXPORT_SYMBOL(m68k_mmutype);
#ifdef CONFIG_VME
unsigned long vme_brdtype;
EXPORT_SYMBOL(vme_brdtype);
#endif
int m68k_is040or060;
EXPORT_SYMBOL(m68k_is040or060);
extern unsigned long availmem;
int m68k_num_memory;
EXPORT_SYMBOL(m68k_num_memory);
int m68k_realnum_memory;
EXPORT_SYMBOL(m68k_realnum_memory);
unsigned long m68k_memoffset;
struct m68k_mem_info m68k_memory[NUM_MEMINFO];
EXPORT_SYMBOL(m68k_memory);
static struct m68k_mem_info m68k_ramdisk __initdata;
static char m68k_command_line[CL_SIZE] __initdata;
void (*mach_sched_init) (irq_handler_t handler) __initdata = NULL;
/* machine dependent irq functions */
void (*mach_init_IRQ) (void) __initdata = NULL;
void (*mach_get_model) (char *model);
void (*mach_get_hardware_list) (struct seq_file *m);
/* machine dependent timer functions */
int (*mach_hwclk) (int, struct rtc_time*);
EXPORT_SYMBOL(mach_hwclk);
unsigned int (*mach_get_ss)(void);
int (*mach_get_rtc_pll)(struct rtc_pll_info *);
int (*mach_set_rtc_pll)(struct rtc_pll_info *);
EXPORT_SYMBOL(mach_get_ss);
EXPORT_SYMBOL(mach_get_rtc_pll);
EXPORT_SYMBOL(mach_set_rtc_pll);
void (*mach_reset)( void );
void (*mach_halt)( void );
void (*mach_power_off)( void );
long mach_max_dma_address = 0x00ffffff; /* default set to the lower 16MB */
#ifdef CONFIG_HEARTBEAT
void (*mach_heartbeat) (int);
EXPORT_SYMBOL(mach_heartbeat);
#endif
#ifdef CONFIG_M68K_L2_CACHE
void (*mach_l2_flush) (int);
#endif
#if defined(CONFIG_ISA) && defined(MULTI_ISA)
int isa_type;
int isa_sex;
EXPORT_SYMBOL(isa_type);
EXPORT_SYMBOL(isa_sex);
#endif
extern int amiga_parse_bootinfo(const struct bi_record *);
extern int atari_parse_bootinfo(const struct bi_record *);
extern int mac_parse_bootinfo(const struct bi_record *);
extern int q40_parse_bootinfo(const struct bi_record *);
extern int bvme6000_parse_bootinfo(const struct bi_record *);
extern int mvme16x_parse_bootinfo(const struct bi_record *);
extern int mvme147_parse_bootinfo(const struct bi_record *);
extern int hp300_parse_bootinfo(const struct bi_record *);
extern int apollo_parse_bootinfo(const struct bi_record *);
extern void config_amiga(void);
extern void config_atari(void);
extern void config_mac(void);
extern void config_sun3(void);
extern void config_apollo(void);
extern void config_mvme147(void);
extern void config_mvme16x(void);
extern void config_bvme6000(void);
extern void config_hp300(void);
extern void config_q40(void);
extern void config_sun3x(void);
#define MASK_256K 0xfffc0000
extern void paging_init(void);
static void __init m68k_parse_bootinfo(const struct bi_record *record)
{
uint16_t tag;
save_bootinfo(record);
while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
int unknown = 0;
const void *data = record->data;
uint16_t size = be16_to_cpu(record->size);
switch (tag) {
case BI_MACHTYPE:
case BI_CPUTYPE:
case BI_FPUTYPE:
case BI_MMUTYPE:
/* Already set up by head.S */
break;
case BI_MEMCHUNK:
if (m68k_num_memory < NUM_MEMINFO) {
const struct mem_info *m = data;
m68k_memory[m68k_num_memory].addr =
be32_to_cpu(m->addr);
m68k_memory[m68k_num_memory].size =
be32_to_cpu(m->size);
m68k_num_memory++;
} else
pr_warn("%s: too many memory chunks\n",
__func__);
break;
case BI_RAMDISK:
{
const struct mem_info *m = data;
m68k_ramdisk.addr = be32_to_cpu(m->addr);
m68k_ramdisk.size = be32_to_cpu(m->size);
}
break;
case BI_COMMAND_LINE:
strlcpy(m68k_command_line, data,
sizeof(m68k_command_line));
break;
default:
if (MACH_IS_AMIGA)
unknown = amiga_parse_bootinfo(record);
else if (MACH_IS_ATARI)
unknown = atari_parse_bootinfo(record);
else if (MACH_IS_MAC)
unknown = mac_parse_bootinfo(record);
else if (MACH_IS_Q40)
unknown = q40_parse_bootinfo(record);
else if (MACH_IS_BVME6000)
unknown = bvme6000_parse_bootinfo(record);
else if (MACH_IS_MVME16x)
unknown = mvme16x_parse_bootinfo(record);
else if (MACH_IS_MVME147)
unknown = mvme147_parse_bootinfo(record);
else if (MACH_IS_HP300)
unknown = hp300_parse_bootinfo(record);
else if (MACH_IS_APOLLO)
unknown = apollo_parse_bootinfo(record);
else
unknown = 1;
}
if (unknown)
pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
tag);
record = (struct bi_record *)((unsigned long)record + size);
}
m68k_realnum_memory = m68k_num_memory;
#ifdef CONFIG_SINGLE_MEMORY_CHUNK
if (m68k_num_memory > 1) {
pr_warn("%s: ignoring last %i chunks of physical memory\n",
__func__, (m68k_num_memory - 1));
m68k_num_memory = 1;
}
#endif
}
void __init setup_arch(char **cmdline_p)
{
/* The bootinfo is located right after the kernel */
if (!CPU_IS_COLDFIRE)
m68k_parse_bootinfo((const struct bi_record *)_end);
if (CPU_IS_040)
m68k_is040or060 = 4;
else if (CPU_IS_060)
m68k_is040or060 = 6;
/* FIXME: m68k_fputype is passed in by Penguin booter, which can
* be confused by software FPU emulation. BEWARE.
* We should really do our own FPU check at startup.
* [what do we do with buggy 68LC040s? if we have problems
* with them, we should add a test to check_bugs() below] */
#if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
/* clear the fpu if we have one */
if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
volatile int zero = 0;
asm volatile ("frestore %0" : : "m" (zero));
}
#endif
if (CPU_IS_060) {
u32 pcr;
asm (".chip 68060; movec %%pcr,%0; .chip 68k"
: "=d" (pcr));
if (((pcr >> 8) & 0xff) <= 5) {
pr_warn("Enabling workaround for errata I14\n");
asm (".chip 68060; movec %0,%%pcr; .chip 68k"
: : "d" (pcr | 0x20));
}
}
init_mm.start_code = PAGE_OFFSET;
init_mm.end_code = (unsigned long)_etext;
init_mm.end_data = (unsigned long)_edata;
init_mm.brk = (unsigned long)_end;
#if defined(CONFIG_BOOTPARAM)
strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
m68k_command_line[CL_SIZE - 1] = 0;
#endif /* CONFIG_BOOTPARAM */
process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
*cmdline_p = m68k_command_line;
memcpy(boot_command_line, *cmdline_p, CL_SIZE);
parse_early_param();
#ifdef CONFIG_DUMMY_CONSOLE
conswitchp = &dummy_con;
#endif
switch (m68k_machtype) {
#ifdef CONFIG_AMIGA
case MACH_AMIGA:
config_amiga();
break;
#endif
#ifdef CONFIG_ATARI
case MACH_ATARI:
config_atari();
break;
#endif
#ifdef CONFIG_MAC
case MACH_MAC:
config_mac();
break;
#endif
#ifdef CONFIG_SUN3
case MACH_SUN3:
config_sun3();
break;
#endif
#ifdef CONFIG_APOLLO
case MACH_APOLLO:
config_apollo();
break;
#endif
#ifdef CONFIG_MVME147
case MACH_MVME147:
config_mvme147();
break;
#endif
#ifdef CONFIG_MVME16x
case MACH_MVME16x:
config_mvme16x();
break;
#endif
#ifdef CONFIG_BVME6000
case MACH_BVME6000:
config_bvme6000();
break;
#endif
#ifdef CONFIG_HP300
case MACH_HP300:
config_hp300();
break;
#endif
#ifdef CONFIG_Q40
case MACH_Q40:
config_q40();
break;
#endif
#ifdef CONFIG_SUN3X
case MACH_SUN3X:
config_sun3x();
break;
#endif
#ifdef CONFIG_COLDFIRE
case MACH_M54XX:
case MACH_M5441X:
cf_bootmem_alloc();
cf_mmu_context_init();
config_BSP(NULL, 0);
break;
#endif
default:
panic("No configuration setup");
}
paging_init();
#ifdef CONFIG_NATFEAT
nf_init();
#endif
#ifndef CONFIG_SUN3
#ifdef CONFIG_BLK_DEV_INITRD
if (m68k_ramdisk.size) {
memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
initrd_end = initrd_start + m68k_ramdisk.size;
pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
}
#endif
#ifdef CONFIG_ATARI
if (MACH_IS_ATARI)
atari_stram_reserve_pages((void *)availmem);
#endif
#ifdef CONFIG_SUN3X
if (MACH_IS_SUN3X) {
dvma_init();
}
#endif
#endif /* !CONFIG_SUN3 */
/* set ISA defs early as possible */
#if defined(CONFIG_ISA) && defined(MULTI_ISA)
if (MACH_IS_Q40) {
isa_type = ISA_TYPE_Q40;
isa_sex = 0;
}
#ifdef CONFIG_AMIGA_PCMCIA
if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
isa_type = ISA_TYPE_AG;
isa_sex = 1;
}
#endif
#ifdef CONFIG_ATARI_ROM_ISA
if (MACH_IS_ATARI) {
isa_type = ISA_TYPE_ENEC;
isa_sex = 0;
}
#endif
#endif
}
static int show_cpuinfo(struct seq_file *m, void *v)
{
const char *cpu, *mmu, *fpu;
unsigned long clockfreq, clockfactor;
#define LOOP_CYCLES_68020 (8)
#define LOOP_CYCLES_68030 (8)
#define LOOP_CYCLES_68040 (3)
#define LOOP_CYCLES_68060 (1)
#define LOOP_CYCLES_COLDFIRE (2)
if (CPU_IS_020) {
cpu = "68020";
clockfactor = LOOP_CYCLES_68020;
} else if (CPU_IS_030) {
cpu = "68030";
clockfactor = LOOP_CYCLES_68030;
} else if (CPU_IS_040) {
cpu = "68040";
clockfactor = LOOP_CYCLES_68040;
} else if (CPU_IS_060) {
cpu = "68060";
clockfactor = LOOP_CYCLES_68060;
} else if (CPU_IS_COLDFIRE) {
cpu = "ColdFire";
clockfactor = LOOP_CYCLES_COLDFIRE;
} else {
cpu = "680x0";
clockfactor = 0;
}
#ifdef CONFIG_M68KFPU_EMU_ONLY
fpu = "none(soft float)";
#else
if (m68k_fputype & FPU_68881)
fpu = "68881";
else if (m68k_fputype & FPU_68882)
fpu = "68882";
else if (m68k_fputype & FPU_68040)
fpu = "68040";
else if (m68k_fputype & FPU_68060)
fpu = "68060";
else if (m68k_fputype & FPU_SUNFPA)
fpu = "Sun FPA";
else if (m68k_fputype & FPU_COLDFIRE)
fpu = "ColdFire";
else
fpu = "none";
#endif
if (m68k_mmutype & MMU_68851)
mmu = "68851";
else if (m68k_mmutype & MMU_68030)
mmu = "68030";
else if (m68k_mmutype & MMU_68040)
mmu = "68040";
else if (m68k_mmutype & MMU_68060)
mmu = "68060";
else if (m68k_mmutype & MMU_SUN3)
mmu = "Sun-3";
else if (m68k_mmutype & MMU_APOLLO)
mmu = "Apollo";
else if (m68k_mmutype & MMU_COLDFIRE)
mmu = "ColdFire";
else
mmu = "unknown";
clockfreq = loops_per_jiffy * HZ * clockfactor;
seq_printf(m, "CPU:\t\t%s\n"
"MMU:\t\t%s\n"
"FPU:\t\t%s\n"
"Clocking:\t%lu.%1luMHz\n"
"BogoMips:\t%lu.%02lu\n"
"Calibration:\t%lu loops\n",
cpu, mmu, fpu,
clockfreq/1000000,(clockfreq/100000)%10,
loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
loops_per_jiffy);
return 0;
}
static void *c_start(struct seq_file *m, loff_t *pos)
{
return *pos < 1 ? (void *)1 : NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
++*pos;
return NULL;
}
static void c_stop(struct seq_file *m, void *v)
{
}
const struct seq_operations cpuinfo_op = {
.start = c_start,
.next = c_next,
.stop = c_stop,
.show = show_cpuinfo,
};
#ifdef CONFIG_PROC_HARDWARE
static int hardware_proc_show(struct seq_file *m, void *v)
{
char model[80];
unsigned long mem;
int i;
if (mach_get_model)
mach_get_model(model);
else
strcpy(model, "Unknown m68k");
seq_printf(m, "Model:\t\t%s\n", model);
for (mem = 0, i = 0; i < m68k_num_memory; i++)
mem += m68k_memory[i].size;
seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
if (mach_get_hardware_list)
mach_get_hardware_list(m);
return 0;
}
static int __init proc_hardware_init(void)
{
proc_create_single("hardware", 0, NULL, hardware_proc_show);
return 0;
}
module_init(proc_hardware_init);
#endif
void check_bugs(void)
{
#if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
if (m68k_fputype == 0) {
pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
"WHICH IS REQUIRED BY LINUX/M68K ***\n");
pr_emerg("Upgrade your hardware or join the FPU "
"emulation project\n");
panic("no FPU");
}
#endif /* !CONFIG_M68KFPU_EMU */
}
#ifdef CONFIG_ADB
static int __init adb_probe_sync_enable (char *str) {
extern int __adb_probe_sync;
__adb_probe_sync = 1;
return 1;
}
__setup("adb_sync", adb_probe_sync_enable);
#endif /* CONFIG_ADB */
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