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linux-stable/arch/powerpc/kernel/setup-common.c
Rob Herring 81d7cac4d1 powerpc: Explicitly include correct DT includes 
The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.

Signed-off-by: Rob Herring <robh@kernel.org>
[mpe: Fixup maple/setup.c which needs platform_device]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230724210247.778034-1-robh@kernel.org
2023-08-02 22:22:19 +10:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Common boot and setup code for both 32-bit and 64-bit.
* Extracted from arch/powerpc/kernel/setup_64.c.
*
* Copyright (C) 2001 PPC64 Team, IBM Corp
*/
#undef DEBUG
#include <linux/export.h>
#include <linux/panic_notifier.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/initrd.h>
#include <linux/platform_device.h>
#include <linux/printk.h>
#include <linux/seq_file.h>
#include <linux/ioport.h>
#include <linux/console.h>
#include <linux/screen_info.h>
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/unistd.h>
#include <linux/seq_buf.h>
#include <linux/serial.h>
#include <linux/serial_8250.h>
#include <linux/percpu.h>
#include <linux/memblock.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/of_irq.h>
#include <linux/hugetlb.h>
#include <linux/pgtable.h>
#include <asm/io.h>
#include <asm/paca.h>
#include <asm/processor.h>
#include <asm/vdso_datapage.h>
#include <asm/smp.h>
#include <asm/elf.h>
#include <asm/machdep.h>
#include <asm/time.h>
#include <asm/cputable.h>
#include <asm/sections.h>
#include <asm/firmware.h>
#include <asm/btext.h>
#include <asm/nvram.h>
#include <asm/setup.h>
#include <asm/rtas.h>
#include <asm/iommu.h>
#include <asm/serial.h>
#include <asm/cache.h>
#include <asm/page.h>
#include <asm/mmu.h>
#include <asm/xmon.h>
#include <asm/cputhreads.h>
#include <mm/mmu_decl.h>
#include <asm/archrandom.h>
#include <asm/fadump.h>
#include <asm/udbg.h>
#include <asm/hugetlb.h>
#include <asm/livepatch.h>
#include <asm/mmu_context.h>
#include <asm/cpu_has_feature.h>
#include <asm/kasan.h>
#include <asm/mce.h>
#include "setup.h"
#ifdef DEBUG
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...)
#endif
/* The main machine-dep calls structure
*/
struct machdep_calls ppc_md;
EXPORT_SYMBOL(ppc_md);
struct machdep_calls *machine_id;
EXPORT_SYMBOL(machine_id);
int boot_cpuid = -1;
EXPORT_SYMBOL_GPL(boot_cpuid);
#ifdef CONFIG_PPC64
int boot_cpu_hwid = -1;
#endif
/*
* These are used in binfmt_elf.c to put aux entries on the stack
* for each elf executable being started.
*/
int dcache_bsize;
int icache_bsize;
/*
* This still seems to be needed... -- paulus
*/
struct screen_info screen_info = {
.orig_x = 0,
.orig_y = 25,
.orig_video_cols = 80,
.orig_video_lines = 25,
.orig_video_isVGA = 1,
.orig_video_points = 16
};
#if defined(CONFIG_FB_VGA16_MODULE)
EXPORT_SYMBOL(screen_info);
#endif
/* Variables required to store legacy IO irq routing */
int of_i8042_kbd_irq;
EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
int of_i8042_aux_irq;
EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
#ifdef __DO_IRQ_CANON
/* XXX should go elsewhere eventually */
int ppc_do_canonicalize_irqs;
EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
#endif
#ifdef CONFIG_CRASH_CORE
/* This keeps a track of which one is the crashing cpu. */
int crashing_cpu = -1;
#endif
/* also used by kexec */
void machine_shutdown(void)
{
/*
* if fadump is active, cleanup the fadump registration before we
* shutdown.
*/
fadump_cleanup();
if (ppc_md.machine_shutdown)
ppc_md.machine_shutdown();
}
static void machine_hang(void)
{
pr_emerg("System Halted, OK to turn off power\n");
local_irq_disable();
while (1)
;
}
void machine_restart(char *cmd)
{
machine_shutdown();
if (ppc_md.restart)
ppc_md.restart(cmd);
smp_send_stop();
do_kernel_restart(cmd);
mdelay(1000);
machine_hang();
}
void machine_power_off(void)
{
machine_shutdown();
do_kernel_power_off();
smp_send_stop();
machine_hang();
}
/* Used by the G5 thermal driver */
EXPORT_SYMBOL_GPL(machine_power_off);
void (*pm_power_off)(void);
EXPORT_SYMBOL_GPL(pm_power_off);
size_t __must_check arch_get_random_seed_longs(unsigned long *v, size_t max_longs)
{
if (max_longs && ppc_md.get_random_seed && ppc_md.get_random_seed(v))
return 1;
return 0;
}
EXPORT_SYMBOL(arch_get_random_seed_longs);
void machine_halt(void)
{
machine_shutdown();
if (ppc_md.halt)
ppc_md.halt();
smp_send_stop();
machine_hang();
}
#ifdef CONFIG_SMP
DEFINE_PER_CPU(unsigned int, cpu_pvr);
#endif
static void show_cpuinfo_summary(struct seq_file *m)
{
struct device_node *root;
const char *model = NULL;
unsigned long bogosum = 0;
int i;
if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) {
for_each_online_cpu(i)
bogosum += loops_per_jiffy;
seq_printf(m, "total bogomips\t: %lu.%02lu\n",
bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100);
}
seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
if (ppc_md.name)
seq_printf(m, "platform\t: %s\n", ppc_md.name);
root = of_find_node_by_path("/");
if (root)
model = of_get_property(root, "model", NULL);
if (model)
seq_printf(m, "model\t\t: %s\n", model);
of_node_put(root);
if (ppc_md.show_cpuinfo != NULL)
ppc_md.show_cpuinfo(m);
/* Display the amount of memory */
if (IS_ENABLED(CONFIG_PPC32))
seq_printf(m, "Memory\t\t: %d MB\n",
(unsigned int)(total_memory / (1024 * 1024)));
}
static int show_cpuinfo(struct seq_file *m, void *v)
{
unsigned long cpu_id = (unsigned long)v - 1;
unsigned int pvr;
unsigned long proc_freq;
unsigned short maj;
unsigned short min;
#ifdef CONFIG_SMP
pvr = per_cpu(cpu_pvr, cpu_id);
#else
pvr = mfspr(SPRN_PVR);
#endif
maj = (pvr >> 8) & 0xFF;
min = pvr & 0xFF;
seq_printf(m, "processor\t: %lu\ncpu\t\t: ", cpu_id);
if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name)
seq_puts(m, cur_cpu_spec->cpu_name);
else
seq_printf(m, "unknown (%08x)", pvr);
if (cpu_has_feature(CPU_FTR_ALTIVEC))
seq_puts(m, ", altivec supported");
seq_putc(m, '\n');
#ifdef CONFIG_TAU
if (cpu_has_feature(CPU_FTR_TAU)) {
if (IS_ENABLED(CONFIG_TAU_AVERAGE)) {
/* more straightforward, but potentially misleading */
seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
cpu_temp(cpu_id));
} else {
/* show the actual temp sensor range */
u32 temp;
temp = cpu_temp_both(cpu_id);
seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
temp & 0xff, temp >> 16);
}
}
#endif /* CONFIG_TAU */
/*
* Platforms that have variable clock rates, should implement
* the method ppc_md.get_proc_freq() that reports the clock
* rate of a given cpu. The rest can use ppc_proc_freq to
* report the clock rate that is same across all cpus.
*/
if (ppc_md.get_proc_freq)
proc_freq = ppc_md.get_proc_freq(cpu_id);
else
proc_freq = ppc_proc_freq;
if (proc_freq)
seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
proc_freq / 1000000, proc_freq % 1000000);
/* If we are a Freescale core do a simple check so
* we don't have to keep adding cases in the future */
if (PVR_VER(pvr) & 0x8000) {
switch (PVR_VER(pvr)) {
case 0x8000: /* 7441/7450/7451, Voyager */
case 0x8001: /* 7445/7455, Apollo 6 */
case 0x8002: /* 7447/7457, Apollo 7 */
case 0x8003: /* 7447A, Apollo 7 PM */
case 0x8004: /* 7448, Apollo 8 */
case 0x800c: /* 7410, Nitro */
maj = ((pvr >> 8) & 0xF);
min = PVR_MIN(pvr);
break;
default: /* e500/book-e */
maj = PVR_MAJ(pvr);
min = PVR_MIN(pvr);
break;
}
} else {
switch (PVR_VER(pvr)) {
case 0x1008: /* 740P/750P ?? */
maj = ((pvr >> 8) & 0xFF) - 1;
min = pvr & 0xFF;
break;
case 0x004e: /* POWER9 bits 12-15 give chip type */
case 0x0080: /* POWER10 bit 12 gives SMT8/4 */
maj = (pvr >> 8) & 0x0F;
min = pvr & 0xFF;
break;
default:
maj = (pvr >> 8) & 0xFF;
min = pvr & 0xFF;
break;
}
}
seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
maj, min, PVR_VER(pvr), PVR_REV(pvr));
if (IS_ENABLED(CONFIG_PPC32))
seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ),
(loops_per_jiffy / (5000 / HZ)) % 100);
seq_putc(m, '\n');
/* If this is the last cpu, print the summary */
if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
show_cpuinfo_summary(m);
return 0;
}
static void *c_start(struct seq_file *m, loff_t *pos)
{
if (*pos == 0) /* just in case, cpu 0 is not the first */
*pos = cpumask_first(cpu_online_mask);
else
*pos = cpumask_next(*pos - 1, cpu_online_mask);
if ((*pos) < nr_cpu_ids)
return (void *)(unsigned long)(*pos + 1);
return NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
(*pos)++;
return c_start(m, pos);
}
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,
};
void __init check_for_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
initrd_start, initrd_end);
/* If we were passed an initrd, set the ROOT_DEV properly if the values
* look sensible. If not, clear initrd reference.
*/
if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
initrd_end > initrd_start)
ROOT_DEV = Root_RAM0;
else
initrd_start = initrd_end = 0;
if (initrd_start)
pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
DBG(" <- check_for_initrd()\n");
#endif /* CONFIG_BLK_DEV_INITRD */
}
#ifdef CONFIG_SMP
int threads_per_core, threads_per_subcore, threads_shift __read_mostly;
cpumask_t threads_core_mask __read_mostly;
EXPORT_SYMBOL_GPL(threads_per_core);
EXPORT_SYMBOL_GPL(threads_per_subcore);
EXPORT_SYMBOL_GPL(threads_shift);
EXPORT_SYMBOL_GPL(threads_core_mask);
static void __init cpu_init_thread_core_maps(int tpc)
{
int i;
threads_per_core = tpc;
threads_per_subcore = tpc;
cpumask_clear(&threads_core_mask);
/* This implementation only supports power of 2 number of threads
* for simplicity and performance
*/
threads_shift = ilog2(tpc);
BUG_ON(tpc != (1 << threads_shift));
for (i = 0; i < tpc; i++)
cpumask_set_cpu(i, &threads_core_mask);
printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
tpc, tpc > 1 ? "s" : "");
printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
}
u32 *cpu_to_phys_id = NULL;
/**
* setup_cpu_maps - initialize the following cpu maps:
* cpu_possible_mask
* cpu_present_mask
*
* Having the possible map set up early allows us to restrict allocations
* of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
*
* We do not initialize the online map here; cpus set their own bits in
* cpu_online_mask as they come up.
*
* This function is valid only for Open Firmware systems. finish_device_tree
* must be called before using this.
*
* While we're here, we may as well set the "physical" cpu ids in the paca.
*
* NOTE: This must match the parsing done in early_init_dt_scan_cpus.
*/
void __init smp_setup_cpu_maps(void)
{
struct device_node *dn;
int cpu = 0;
int nthreads = 1;
DBG("smp_setup_cpu_maps()\n");
cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32),
__alignof__(u32));
if (!cpu_to_phys_id)
panic("%s: Failed to allocate %zu bytes align=0x%zx\n",
__func__, nr_cpu_ids * sizeof(u32), __alignof__(u32));
for_each_node_by_type(dn, "cpu") {
const __be32 *intserv;
__be32 cpu_be;
int j, len;
DBG(" * %pOF...\n", dn);
intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
&len);
if (intserv) {
DBG(" ibm,ppc-interrupt-server#s -> %lu threads\n",
(len / sizeof(int)));
} else {
DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
intserv = of_get_property(dn, "reg", &len);
if (!intserv) {
cpu_be = cpu_to_be32(cpu);
/* XXX: what is this? uninitialized?? */
intserv = &cpu_be; /* assume logical == phys */
len = 4;
}
}
nthreads = len / sizeof(int);
for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
bool avail;
DBG(" thread %d -> cpu %d (hard id %d)\n",
j, cpu, be32_to_cpu(intserv[j]));
avail = of_device_is_available(dn);
if (!avail)
avail = !of_property_match_string(dn,
"enable-method", "spin-table");
set_cpu_present(cpu, avail);
set_cpu_possible(cpu, true);
cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]);
cpu++;
}
if (cpu >= nr_cpu_ids) {
of_node_put(dn);
break;
}
}
/* If no SMT supported, nthreads is forced to 1 */
if (!cpu_has_feature(CPU_FTR_SMT)) {
DBG(" SMT disabled ! nthreads forced to 1\n");
nthreads = 1;
}
#ifdef CONFIG_PPC64
/*
* On pSeries LPAR, we need to know how many cpus
* could possibly be added to this partition.
*/
if (firmware_has_feature(FW_FEATURE_LPAR) &&
(dn = of_find_node_by_path("/rtas"))) {
int num_addr_cell, num_size_cell, maxcpus;
const __be32 *ireg;
num_addr_cell = of_n_addr_cells(dn);
num_size_cell = of_n_size_cells(dn);
ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
if (!ireg)
goto out;
maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
/* Double maxcpus for processors which have SMT capability */
if (cpu_has_feature(CPU_FTR_SMT))
maxcpus *= nthreads;
if (maxcpus > nr_cpu_ids) {
printk(KERN_WARNING
"Partition configured for %d cpus, "
"operating system maximum is %u.\n",
maxcpus, nr_cpu_ids);
maxcpus = nr_cpu_ids;
} else
printk(KERN_INFO "Partition configured for %d cpus.\n",
maxcpus);
for (cpu = 0; cpu < maxcpus; cpu++)
set_cpu_possible(cpu, true);
out:
of_node_put(dn);
}
vdso_data->processorCount = num_present_cpus();
#endif /* CONFIG_PPC64 */
/* Initialize CPU <=> thread mapping/
*
* WARNING: We assume that the number of threads is the same for
* every CPU in the system. If that is not the case, then some code
* here will have to be reworked
*/
cpu_init_thread_core_maps(nthreads);
/* Now that possible cpus are set, set nr_cpu_ids for later use */
setup_nr_cpu_ids();
free_unused_pacas();
}
#endif /* CONFIG_SMP */
#ifdef CONFIG_PCSPKR_PLATFORM
static __init int add_pcspkr(void)
{
struct device_node *np;
struct platform_device *pd;
int ret;
np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
of_node_put(np);
if (!np)
return -ENODEV;
pd = platform_device_alloc("pcspkr", -1);
if (!pd)
return -ENOMEM;
ret = platform_device_add(pd);
if (ret)
platform_device_put(pd);
return ret;
}
device_initcall(add_pcspkr);
#endif /* CONFIG_PCSPKR_PLATFORM */
static char ppc_hw_desc_buf[128] __initdata;
struct seq_buf ppc_hw_desc __initdata = {
.buffer = ppc_hw_desc_buf,
.size = sizeof(ppc_hw_desc_buf),
.len = 0,
.readpos = 0,
};
static __init void probe_machine(void)
{
extern struct machdep_calls __machine_desc_start;
extern struct machdep_calls __machine_desc_end;
unsigned int i;
/*
* Iterate all ppc_md structures until we find the proper
* one for the current machine type
*/
DBG("Probing machine type ...\n");
/*
* Check ppc_md is empty, if not we have a bug, ie, we setup an
* entry before probe_machine() which will be overwritten
*/
for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
if (((void **)&ppc_md)[i]) {
printk(KERN_ERR "Entry %d in ppc_md non empty before"
" machine probe !\n", i);
}
}
for (machine_id = &__machine_desc_start;
machine_id < &__machine_desc_end;
machine_id++) {
DBG(" %s ...\n", machine_id->name);
if (machine_id->compatible && !of_machine_is_compatible(machine_id->compatible))
continue;
memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
if (ppc_md.probe && !ppc_md.probe())
continue;
DBG(" %s match !\n", machine_id->name);
break;
}
/* What can we do if we didn't find ? */
if (machine_id >= &__machine_desc_end) {
pr_err("No suitable machine description found !\n");
for (;;);
}
// Append the machine name to other info we've gathered
seq_buf_puts(&ppc_hw_desc, ppc_md.name);
// Set the generic hardware description shown in oopses
dump_stack_set_arch_desc(ppc_hw_desc.buffer);
pr_info("Hardware name: %s\n", ppc_hw_desc.buffer);
}
/* Match a class of boards, not a specific device configuration. */
int check_legacy_ioport(unsigned long base_port)
{
struct device_node *parent, *np = NULL;
int ret = -ENODEV;
switch(base_port) {
case I8042_DATA_REG:
if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
if (np) {
parent = of_get_parent(np);
of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
if (!of_i8042_kbd_irq)
of_i8042_kbd_irq = 1;
of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
if (!of_i8042_aux_irq)
of_i8042_aux_irq = 12;
of_node_put(np);
np = parent;
break;
}
np = of_find_node_by_type(NULL, "8042");
/* Pegasos has no device_type on its 8042 node, look for the
* name instead */
if (!np)
np = of_find_node_by_name(NULL, "8042");
if (np) {
of_i8042_kbd_irq = 1;
of_i8042_aux_irq = 12;
}
break;
case FDC_BASE: /* FDC1 */
np = of_find_node_by_type(NULL, "fdc");
break;
default:
/* ipmi is supposed to fail here */
break;
}
if (!np)
return ret;
parent = of_get_parent(np);
if (parent) {
if (of_node_is_type(parent, "isa"))
ret = 0;
of_node_put(parent);
}
of_node_put(np);
return ret;
}
EXPORT_SYMBOL(check_legacy_ioport);
/*
* Panic notifiers setup
*
* We have 3 notifiers for powerpc, each one from a different "nature":
*
* - ppc_panic_fadump_handler() is a hypervisor notifier, which hard-disables
* IRQs and deal with the Firmware-Assisted dump, when it is configured;
* should run early in the panic path.
*
* - dump_kernel_offset() is an informative notifier, just showing the KASLR
* offset if we have RANDOMIZE_BASE set.
*
* - ppc_panic_platform_handler() is a low-level handler that's registered
* only if the platform wishes to perform final actions in the panic path,
* hence it should run late and might not even return. Currently, only
* pseries and ps3 platforms register callbacks.
*/
static int ppc_panic_fadump_handler(struct notifier_block *this,
unsigned long event, void *ptr)
{
/*
* panic does a local_irq_disable, but we really
* want interrupts to be hard disabled.
*/
hard_irq_disable();
/*
* If firmware-assisted dump has been registered then trigger
* its callback and let the firmware handles everything else.
*/
crash_fadump(NULL, ptr);
return NOTIFY_DONE;
}
static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
void *p)
{
pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
kaslr_offset(), KERNELBASE);
return NOTIFY_DONE;
}
static int ppc_panic_platform_handler(struct notifier_block *this,
unsigned long event, void *ptr)
{
/*
* This handler is only registered if we have a panic callback
* on ppc_md, hence NULL check is not needed.
* Also, it may not return, so it runs really late on panic path.
*/
ppc_md.panic(ptr);
return NOTIFY_DONE;
}
static struct notifier_block ppc_fadump_block = {
.notifier_call = ppc_panic_fadump_handler,
.priority = INT_MAX, /* run early, to notify the firmware ASAP */
};
static struct notifier_block kernel_offset_notifier = {
.notifier_call = dump_kernel_offset,
};
static struct notifier_block ppc_panic_block = {
.notifier_call = ppc_panic_platform_handler,
.priority = INT_MIN, /* may not return; must be done last */
};
void __init setup_panic(void)
{
/* Hard-disables IRQs + deal with FW-assisted dump (fadump) */
atomic_notifier_chain_register(&panic_notifier_list,
&ppc_fadump_block);
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0)
atomic_notifier_chain_register(&panic_notifier_list,
&kernel_offset_notifier);
/* Low-level platform-specific routines that should run on panic */
if (ppc_md.panic)
atomic_notifier_chain_register(&panic_notifier_list,
&ppc_panic_block);
}
#ifdef CONFIG_CHECK_CACHE_COHERENCY
/*
* For platforms that have configurable cache-coherency. This function
* checks that the cache coherency setting of the kernel matches the setting
* left by the firmware, as indicated in the device tree. Since a mismatch
* will eventually result in DMA failures, we print * and error and call
* BUG() in that case.
*/
#define KERNEL_COHERENCY (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE))
static int __init check_cache_coherency(void)
{
struct device_node *np;
const void *prop;
bool devtree_coherency;
np = of_find_node_by_path("/");
prop = of_get_property(np, "coherency-off", NULL);
of_node_put(np);
devtree_coherency = prop ? false : true;
if (devtree_coherency != KERNEL_COHERENCY) {
printk(KERN_ERR
"kernel coherency:%s != device tree_coherency:%s\n",
KERNEL_COHERENCY ? "on" : "off",
devtree_coherency ? "on" : "off");
BUG();
}
return 0;
}
late_initcall(check_cache_coherency);
#endif /* CONFIG_CHECK_CACHE_COHERENCY */
void ppc_printk_progress(char *s, unsigned short hex)
{
pr_info("%s\n", s);
}
static __init void print_system_info(void)
{
pr_info("-----------------------------------------------------\n");
pr_info("phys_mem_size = 0x%llx\n",
(unsigned long long)memblock_phys_mem_size());
pr_info("dcache_bsize = 0x%x\n", dcache_bsize);
pr_info("icache_bsize = 0x%x\n", icache_bsize);
pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features);
pr_info(" possible = 0x%016lx\n",
(unsigned long)CPU_FTRS_POSSIBLE);
pr_info(" always = 0x%016lx\n",
(unsigned long)CPU_FTRS_ALWAYS);
pr_info("cpu_user_features = 0x%08x 0x%08x\n",
cur_cpu_spec->cpu_user_features,
cur_cpu_spec->cpu_user_features2);
pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features);
#ifdef CONFIG_PPC64
pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
#ifdef CONFIG_PPC_BOOK3S
pr_info("vmalloc start = 0x%lx\n", KERN_VIRT_START);
pr_info("IO start = 0x%lx\n", KERN_IO_START);
pr_info("vmemmap start = 0x%lx\n", (unsigned long)vmemmap);
#endif
#endif
if (!early_radix_enabled())
print_system_hash_info();
if (PHYSICAL_START > 0)
pr_info("physical_start = 0x%llx\n",
(unsigned long long)PHYSICAL_START);
pr_info("-----------------------------------------------------\n");
}
#ifdef CONFIG_SMP
static void __init smp_setup_pacas(void)
{
int cpu;
for_each_possible_cpu(cpu) {
if (cpu == smp_processor_id())
continue;
allocate_paca(cpu);
set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
}
memblock_free(cpu_to_phys_id, nr_cpu_ids * sizeof(u32));
cpu_to_phys_id = NULL;
}
#endif
/*
* Called into from start_kernel this initializes memblock, which is used
* to manage page allocation until mem_init is called.
*/
void __init setup_arch(char **cmdline_p)
{
kasan_init();
*cmdline_p = boot_command_line;
/* Set a half-reasonable default so udelay does something sensible */
loops_per_jiffy = 500000000 / HZ;
/* Unflatten the device-tree passed by prom_init or kexec */
unflatten_device_tree();
/*
* Initialize cache line/block info from device-tree (on ppc64) or
* just cputable (on ppc32).
*/
initialize_cache_info();
/* Initialize RTAS if available. */
rtas_initialize();
/* Check if we have an initrd provided via the device-tree. */
check_for_initrd();
/* Probe the machine type, establish ppc_md. */
probe_machine();
/* Setup panic notifier if requested by the platform. */
setup_panic();
/*
* Configure ppc_md.power_save (ppc32 only, 64-bit machines do
* it from their respective probe() function.
*/
setup_power_save();
/* Discover standard serial ports. */
find_legacy_serial_ports();
/* Register early console with the printk subsystem. */
register_early_udbg_console();
/* Setup the various CPU maps based on the device-tree. */
smp_setup_cpu_maps();
/* Initialize xmon. */
xmon_setup();
/* Check the SMT related command line arguments (ppc64). */
check_smt_enabled();
/* Parse memory topology */
mem_topology_setup();
/*
* Release secondary cpus out of their spinloops at 0x60 now that
* we can map physical -> logical CPU ids.
*
* Freescale Book3e parts spin in a loop provided by firmware,
* so smp_release_cpus() does nothing for them.
*/
#ifdef CONFIG_SMP
smp_setup_pacas();
/* On BookE, setup per-core TLB data structures. */
setup_tlb_core_data();
#endif
/* Print various info about the machine that has been gathered so far. */
print_system_info();
klp_init_thread_info(&init_task);
setup_initial_init_mm(_stext, _etext, _edata, _end);
/* sched_init() does the mmgrab(&init_mm) for the primary CPU */
VM_WARN_ON(cpumask_test_cpu(smp_processor_id(), mm_cpumask(&init_mm)));
cpumask_set_cpu(smp_processor_id(), mm_cpumask(&init_mm));
inc_mm_active_cpus(&init_mm);
mm_iommu_init(&init_mm);
irqstack_early_init();
exc_lvl_early_init();
emergency_stack_init();
mce_init();
smp_release_cpus();
initmem_init();
/*
* Reserve large chunks of memory for use by CMA for KVM and hugetlb. These must
* be called after initmem_init(), so that pageblock_order is initialised.
*/
kvm_cma_reserve();
gigantic_hugetlb_cma_reserve();
early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
if (ppc_md.setup_arch)
ppc_md.setup_arch();
setup_barrier_nospec();
setup_spectre_v2();
paging_init();
/* Initialize the MMU context management stuff. */
mmu_context_init();
/* Interrupt code needs to be 64K-aligned. */
if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff)
panic("Kernelbase not 64K-aligned (0x%lx)!\n",
(unsigned long)_stext);
}
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