mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-01 04:36:43 +07:00
f465df81a8
Most of the platforms were printing the size of the memory in their show_cpuinfo implementations. This moves that to the common show_cpuinfo, so that all 32-bit platforms will now print the size of memory. I also update the code to deal with the fact that total_memory is now a phys_addr_t. Signed-off-by: Becky Bruce <becky.bruce@freescale.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
672 lines
16 KiB
C
672 lines
16 KiB
C
/*
|
|
* 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
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#undef DEBUG
|
|
|
|
#include <linux/module.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/seq_file.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/console.h>
|
|
#include <linux/utsname.h>
|
|
#include <linux/screen_info.h>
|
|
#include <linux/root_dev.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/unistd.h>
|
|
#include <linux/serial.h>
|
|
#include <linux/serial_8250.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/lmb.h>
|
|
#include <asm/io.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/vdso_datapage.h>
|
|
#include <asm/pgtable.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/system.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 "setup.h"
|
|
|
|
#ifdef DEBUG
|
|
#include <asm/udbg.h>
|
|
#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);
|
|
|
|
unsigned long klimit = (unsigned long) _end;
|
|
|
|
char cmd_line[COMMAND_LINE_SIZE];
|
|
|
|
/*
|
|
* 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
|
|
};
|
|
|
|
#ifdef __DO_IRQ_CANON
|
|
/* XXX should go elsewhere eventually */
|
|
int ppc_do_canonicalize_irqs;
|
|
EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
|
|
#endif
|
|
|
|
/* also used by kexec */
|
|
void machine_shutdown(void)
|
|
{
|
|
if (ppc_md.machine_shutdown)
|
|
ppc_md.machine_shutdown();
|
|
}
|
|
|
|
void machine_restart(char *cmd)
|
|
{
|
|
machine_shutdown();
|
|
if (ppc_md.restart)
|
|
ppc_md.restart(cmd);
|
|
#ifdef CONFIG_SMP
|
|
smp_send_stop();
|
|
#endif
|
|
printk(KERN_EMERG "System Halted, OK to turn off power\n");
|
|
local_irq_disable();
|
|
while (1) ;
|
|
}
|
|
|
|
void machine_power_off(void)
|
|
{
|
|
machine_shutdown();
|
|
if (ppc_md.power_off)
|
|
ppc_md.power_off();
|
|
#ifdef CONFIG_SMP
|
|
smp_send_stop();
|
|
#endif
|
|
printk(KERN_EMERG "System Halted, OK to turn off power\n");
|
|
local_irq_disable();
|
|
while (1) ;
|
|
}
|
|
/* Used by the G5 thermal driver */
|
|
EXPORT_SYMBOL_GPL(machine_power_off);
|
|
|
|
void (*pm_power_off)(void) = machine_power_off;
|
|
EXPORT_SYMBOL_GPL(pm_power_off);
|
|
|
|
void machine_halt(void)
|
|
{
|
|
machine_shutdown();
|
|
if (ppc_md.halt)
|
|
ppc_md.halt();
|
|
#ifdef CONFIG_SMP
|
|
smp_send_stop();
|
|
#endif
|
|
printk(KERN_EMERG "System Halted, OK to turn off power\n");
|
|
local_irq_disable();
|
|
while (1) ;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_TAU
|
|
extern u32 cpu_temp(unsigned long cpu);
|
|
extern u32 cpu_temp_both(unsigned long cpu);
|
|
#endif /* CONFIG_TAU */
|
|
|
|
#ifdef CONFIG_SMP
|
|
DEFINE_PER_CPU(unsigned int, pvr);
|
|
#endif
|
|
|
|
static int show_cpuinfo(struct seq_file *m, void *v)
|
|
{
|
|
unsigned long cpu_id = (unsigned long)v - 1;
|
|
unsigned int pvr;
|
|
unsigned short maj;
|
|
unsigned short min;
|
|
|
|
if (cpu_id == NR_CPUS) {
|
|
struct device_node *root;
|
|
const char *model = NULL;
|
|
#if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
|
|
unsigned long bogosum = 0;
|
|
int i;
|
|
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);
|
|
#endif /* CONFIG_SMP && CONFIG_PPC32 */
|
|
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);
|
|
|
|
#ifdef CONFIG_PPC32
|
|
/* Display the amount of memory */
|
|
seq_printf(m, "Memory\t\t: %d MB\n",
|
|
(unsigned int)(total_memory / (1024 * 1024)));
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* We only show online cpus: disable preempt (overzealous, I
|
|
* knew) to prevent cpu going down. */
|
|
preempt_disable();
|
|
if (!cpu_online(cpu_id)) {
|
|
preempt_enable();
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
pvr = per_cpu(pvr, cpu_id);
|
|
#else
|
|
pvr = mfspr(SPRN_PVR);
|
|
#endif
|
|
maj = (pvr >> 8) & 0xFF;
|
|
min = pvr & 0xFF;
|
|
|
|
seq_printf(m, "processor\t: %lu\n", cpu_id);
|
|
seq_printf(m, "cpu\t\t: ");
|
|
|
|
if (cur_cpu_spec->pvr_mask)
|
|
seq_printf(m, "%s", cur_cpu_spec->cpu_name);
|
|
else
|
|
seq_printf(m, "unknown (%08x)", pvr);
|
|
|
|
#ifdef CONFIG_ALTIVEC
|
|
if (cpu_has_feature(CPU_FTR_ALTIVEC))
|
|
seq_printf(m, ", altivec supported");
|
|
#endif /* CONFIG_ALTIVEC */
|
|
|
|
seq_printf(m, "\n");
|
|
|
|
#ifdef CONFIG_TAU
|
|
if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
|
|
#ifdef 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
|
|
}
|
|
#endif /* CONFIG_TAU */
|
|
|
|
/*
|
|
* Assume here that all clock rates are the same in a
|
|
* smp system. -- Cort
|
|
*/
|
|
if (ppc_proc_freq)
|
|
seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
|
|
ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
|
|
|
|
if (ppc_md.show_percpuinfo != NULL)
|
|
ppc_md.show_percpuinfo(m, cpu_id);
|
|
|
|
/* If we are a Freescale core do a simple check so
|
|
* we dont 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 0x0020: /* 403 family */
|
|
maj = PVR_MAJ(pvr) + 1;
|
|
min = PVR_MIN(pvr);
|
|
break;
|
|
case 0x1008: /* 740P/750P ?? */
|
|
maj = ((pvr >> 8) & 0xFF) - 1;
|
|
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));
|
|
|
|
#ifdef CONFIG_PPC32
|
|
seq_printf(m, "bogomips\t: %lu.%02lu\n",
|
|
loops_per_jiffy / (500000/HZ),
|
|
(loops_per_jiffy / (5000/HZ)) % 100);
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
seq_printf(m, "\n");
|
|
#endif
|
|
|
|
preempt_enable();
|
|
return 0;
|
|
}
|
|
|
|
static void *c_start(struct seq_file *m, loff_t *pos)
|
|
{
|
|
unsigned long i = *pos;
|
|
|
|
return i <= NR_CPUS ? (void *)(i + 1) : 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)
|
|
{
|
|
}
|
|
|
|
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)
|
|
printk("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_shift;
|
|
cpumask_t threads_core_mask;
|
|
|
|
static void __init cpu_init_thread_core_maps(int tpc)
|
|
{
|
|
int i;
|
|
|
|
threads_per_core = tpc;
|
|
threads_core_mask = CPU_MASK_NONE;
|
|
|
|
/* 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++)
|
|
cpu_set(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);
|
|
}
|
|
|
|
|
|
/**
|
|
* setup_cpu_maps - initialize the following cpu maps:
|
|
* cpu_possible_map
|
|
* cpu_present_map
|
|
*
|
|
* Having the possible map set up early allows us to restrict allocations
|
|
* of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
|
|
*
|
|
* We do not initialize the online map here; cpus set their own bits in
|
|
* cpu_online_map 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 = NULL;
|
|
int cpu = 0;
|
|
int nthreads = 1;
|
|
|
|
DBG("smp_setup_cpu_maps()\n");
|
|
|
|
while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
|
|
const int *intserv;
|
|
int j, len;
|
|
|
|
DBG(" * %s...\n", dn->full_name);
|
|
|
|
intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
|
|
&len);
|
|
if (intserv) {
|
|
nthreads = len / sizeof(int);
|
|
DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
|
|
nthreads);
|
|
} else {
|
|
DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
|
|
intserv = of_get_property(dn, "reg", NULL);
|
|
if (!intserv)
|
|
intserv = &cpu; /* assume logical == phys */
|
|
}
|
|
|
|
for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
|
|
DBG(" thread %d -> cpu %d (hard id %d)\n",
|
|
j, cpu, intserv[j]);
|
|
cpu_set(cpu, cpu_present_map);
|
|
set_hard_smp_processor_id(cpu, intserv[j]);
|
|
cpu_set(cpu, cpu_possible_map);
|
|
cpu++;
|
|
}
|
|
}
|
|
|
|
/* 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 (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
|
|
(dn = of_find_node_by_path("/rtas"))) {
|
|
int num_addr_cell, num_size_cell, maxcpus;
|
|
const unsigned int *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 = 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_CPUS) {
|
|
printk(KERN_WARNING
|
|
"Partition configured for %d cpus, "
|
|
"operating system maximum is %d.\n",
|
|
maxcpus, NR_CPUS);
|
|
maxcpus = NR_CPUS;
|
|
} else
|
|
printk(KERN_INFO "Partition configured for %d cpus.\n",
|
|
maxcpus);
|
|
|
|
for (cpu = 0; cpu < maxcpus; cpu++)
|
|
cpu_set(cpu, cpu_possible_map);
|
|
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);
|
|
}
|
|
#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 */
|
|
|
|
void probe_machine(void)
|
|
{
|
|
extern struct machdep_calls __machine_desc_start;
|
|
extern struct machdep_calls __machine_desc_end;
|
|
|
|
/*
|
|
* Iterate all ppc_md structures until we find the proper
|
|
* one for the current machine type
|
|
*/
|
|
DBG("Probing machine type ...\n");
|
|
|
|
for (machine_id = &__machine_desc_start;
|
|
machine_id < &__machine_desc_end;
|
|
machine_id++) {
|
|
DBG(" %s ...", machine_id->name);
|
|
memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
|
|
if (ppc_md.probe()) {
|
|
DBG(" match !\n");
|
|
break;
|
|
}
|
|
DBG("\n");
|
|
}
|
|
/* What can we do if we didn't find ? */
|
|
if (machine_id >= &__machine_desc_end) {
|
|
DBG("No suitable machine found !\n");
|
|
for (;;);
|
|
}
|
|
|
|
printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
|
|
}
|
|
|
|
/* 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_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");
|
|
break;
|
|
case FDC_BASE: /* FDC1 */
|
|
np = of_find_node_by_type(NULL, "fdc");
|
|
break;
|
|
#ifdef CONFIG_PPC_PREP
|
|
case _PIDXR:
|
|
case _PNPWRP:
|
|
case PNPBIOS_BASE:
|
|
/* implement me */
|
|
#endif
|
|
default:
|
|
/* ipmi is supposed to fail here */
|
|
break;
|
|
}
|
|
if (!np)
|
|
return ret;
|
|
parent = of_get_parent(np);
|
|
if (parent) {
|
|
if (strcmp(parent->type, "isa") == 0)
|
|
ret = 0;
|
|
of_node_put(parent);
|
|
}
|
|
of_node_put(np);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(check_legacy_ioport);
|
|
|
|
static int ppc_panic_event(struct notifier_block *this,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
ppc_md.panic(ptr); /* May not return */
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block ppc_panic_block = {
|
|
.notifier_call = ppc_panic_event,
|
|
.priority = INT_MIN /* may not return; must be done last */
|
|
};
|
|
|
|
void __init setup_panic(void)
|
|
{
|
|
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.
|
|
*/
|
|
|
|
#ifdef CONFIG_NOT_COHERENT_CACHE
|
|
#define KERNEL_COHERENCY 0
|
|
#else
|
|
#define KERNEL_COHERENCY 1
|
|
#endif
|
|
|
|
static int __init check_cache_coherency(void)
|
|
{
|
|
struct device_node *np;
|
|
const void *prop;
|
|
int devtree_coherency;
|
|
|
|
np = of_find_node_by_path("/");
|
|
prop = of_get_property(np, "coherency-off", NULL);
|
|
of_node_put(np);
|
|
|
|
devtree_coherency = prop ? 0 : 1;
|
|
|
|
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 */
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
struct dentry *powerpc_debugfs_root;
|
|
|
|
static int powerpc_debugfs_init(void)
|
|
{
|
|
powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
|
|
|
|
return powerpc_debugfs_root == NULL;
|
|
}
|
|
arch_initcall(powerpc_debugfs_init);
|
|
#endif
|