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linuxdebug/arch/powerpc/kernel/prom.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Procedures for creating, accessing and interpreting the device tree.
*
* Paul Mackerras August 1996.
* Copyright (C) 1996-2005 Paul Mackerras.
*
* Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
* {engebret|bergner}@us.ibm.com
*/
#undef DEBUG
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/initrd.h>
#include <linux/bitops.h>
#include <linux/export.h>
#include <linux/kexec.h>
#include <linux/irq.h>
#include <linux/memblock.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/libfdt.h>
#include <linux/cpu.h>
#include <linux/pgtable.h>
#include <linux/seq_buf.h>
#include <asm/rtas.h>
#include <asm/page.h>
#include <asm/processor.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/kdump.h>
#include <asm/smp.h>
#include <asm/mmu.h>
#include <asm/paca.h>
#include <asm/powernv.h>
#include <asm/iommu.h>
#include <asm/btext.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/pci-bridge.h>
#include <asm/kexec.h>
#include <asm/opal.h>
#include <asm/fadump.h>
#include <asm/epapr_hcalls.h>
#include <asm/firmware.h>
#include <asm/dt_cpu_ftrs.h>
#include <asm/drmem.h>
#include <asm/ultravisor.h>
#include <asm/prom.h>
#include <mm/mmu_decl.h>
#ifdef DEBUG
#define DBG(fmt...) printk(KERN_ERR fmt)
#else
#define DBG(fmt...)
#endif
int *chip_id_lookup_table;
#ifdef CONFIG_PPC64
int __initdata iommu_is_off;
int __initdata iommu_force_on;
unsigned long tce_alloc_start, tce_alloc_end;
u64 ppc64_rma_size;
#endif
static phys_addr_t first_memblock_size;
static int __initdata boot_cpu_count;
static int __init early_parse_mem(char *p)
{
if (!p)
return 1;
memory_limit = PAGE_ALIGN(memparse(p, &p));
DBG("memory limit = 0x%llx\n", memory_limit);
return 0;
}
early_param("mem", early_parse_mem);
/*
* overlaps_initrd - check for overlap with page aligned extension of
* initrd.
*/
static inline int overlaps_initrd(unsigned long start, unsigned long size)
{
#ifdef CONFIG_BLK_DEV_INITRD
if (!initrd_start)
return 0;
return (start + size) > ALIGN_DOWN(initrd_start, PAGE_SIZE) &&
start <= ALIGN(initrd_end, PAGE_SIZE);
#else
return 0;
#endif
}
/**
* move_device_tree - move tree to an unused area, if needed.
*
* The device tree may be allocated beyond our memory limit, or inside the
* crash kernel region for kdump, or within the page aligned range of initrd.
* If so, move it out of the way.
*/
static void __init move_device_tree(void)
{
unsigned long start, size;
void *p;
DBG("-> move_device_tree\n");
start = __pa(initial_boot_params);
size = fdt_totalsize(initial_boot_params);
if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) ||
!memblock_is_memory(start + size - 1) ||
overlaps_crashkernel(start, size) || overlaps_initrd(start, size)) {
p = memblock_alloc_raw(size, PAGE_SIZE);
if (!p)
panic("Failed to allocate %lu bytes to move device tree\n",
size);
memcpy(p, initial_boot_params, size);
initial_boot_params = p;
DBG("Moved device tree to 0x%px\n", p);
}
DBG("<- move_device_tree\n");
}
/*
* ibm,pa/pi-features is a per-cpu property that contains a string of
* attribute descriptors, each of which has a 2 byte header plus up
* to 254 bytes worth of processor attribute bits. First header
* byte specifies the number of bytes following the header.
* Second header byte is an "attribute-specifier" type, of which
* zero is the only currently-defined value.
* Implementation: Pass in the byte and bit offset for the feature
* that we are interested in. The function will return -1 if the
* pa-features property is missing, or a 1/0 to indicate if the feature
* is supported/not supported. Note that the bit numbers are
* big-endian to match the definition in PAPR.
*/
struct ibm_feature {
unsigned long cpu_features; /* CPU_FTR_xxx bit */
unsigned long mmu_features; /* MMU_FTR_xxx bit */
unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */
unsigned int cpu_user_ftrs2; /* PPC_FEATURE2_xxx bit */
unsigned char pabyte; /* byte number in ibm,pa/pi-features */
unsigned char pabit; /* bit number (big-endian) */
unsigned char invert; /* if 1, pa bit set => clear feature */
};
static struct ibm_feature ibm_pa_features[] __initdata = {
{ .pabyte = 0, .pabit = 0, .cpu_user_ftrs = PPC_FEATURE_HAS_MMU },
{ .pabyte = 0, .pabit = 1, .cpu_user_ftrs = PPC_FEATURE_HAS_FPU },
{ .pabyte = 0, .pabit = 3, .cpu_features = CPU_FTR_CTRL },
{ .pabyte = 0, .pabit = 6, .cpu_features = CPU_FTR_NOEXECUTE },
{ .pabyte = 1, .pabit = 2, .mmu_features = MMU_FTR_CI_LARGE_PAGE },
#ifdef CONFIG_PPC_RADIX_MMU
{ .pabyte = 40, .pabit = 0, .mmu_features = MMU_FTR_TYPE_RADIX | MMU_FTR_GTSE },
#endif
{ .pabyte = 5, .pabit = 0, .cpu_features = CPU_FTR_REAL_LE,
.cpu_user_ftrs = PPC_FEATURE_TRUE_LE },
/*
* If the kernel doesn't support TM (ie CONFIG_PPC_TRANSACTIONAL_MEM=n),
* we don't want to turn on TM here, so we use the *_COMP versions
* which are 0 if the kernel doesn't support TM.
*/
{ .pabyte = 22, .pabit = 0, .cpu_features = CPU_FTR_TM_COMP,
.cpu_user_ftrs2 = PPC_FEATURE2_HTM_COMP | PPC_FEATURE2_HTM_NOSC_COMP },
{ .pabyte = 64, .pabit = 0, .cpu_features = CPU_FTR_DAWR1 },
};
/*
* ibm,pi-features property provides the support of processor specific
* options not described in ibm,pa-features. Right now use byte 0, bit 3
* which indicates the occurrence of DSI interrupt when the paste operation
* on the suspended NX window.
*/
static struct ibm_feature ibm_pi_features[] __initdata = {
{ .pabyte = 0, .pabit = 3, .mmu_features = MMU_FTR_NX_DSI },
};
static void __init scan_features(unsigned long node, const unsigned char *ftrs,
unsigned long tablelen,
struct ibm_feature *fp,
unsigned long ft_size)
{
unsigned long i, len, bit;
/* find descriptor with type == 0 */
for (;;) {
if (tablelen < 3)
return;
len = 2 + ftrs[0];
if (tablelen < len)
return; /* descriptor 0 not found */
if (ftrs[1] == 0)
break;
tablelen -= len;
ftrs += len;
}
/* loop over bits we know about */
for (i = 0; i < ft_size; ++i, ++fp) {
if (fp->pabyte >= ftrs[0])
continue;
bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
if (bit ^ fp->invert) {
cur_cpu_spec->cpu_features |= fp->cpu_features;
cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
cur_cpu_spec->cpu_user_features2 |= fp->cpu_user_ftrs2;
cur_cpu_spec->mmu_features |= fp->mmu_features;
} else {
cur_cpu_spec->cpu_features &= ~fp->cpu_features;
cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
cur_cpu_spec->cpu_user_features2 &= ~fp->cpu_user_ftrs2;
cur_cpu_spec->mmu_features &= ~fp->mmu_features;
}
}
}
static void __init check_cpu_features(unsigned long node, char *name,
struct ibm_feature *fp,
unsigned long size)
{
const unsigned char *pa_ftrs;
int tablelen;
pa_ftrs = of_get_flat_dt_prop(node, name, &tablelen);
if (pa_ftrs == NULL)
return;
scan_features(node, pa_ftrs, tablelen, fp, size);
}
#ifdef CONFIG_PPC_64S_HASH_MMU
static void __init init_mmu_slb_size(unsigned long node)
{
const __be32 *slb_size_ptr;
slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL) ? :
of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
if (slb_size_ptr)
mmu_slb_size = be32_to_cpup(slb_size_ptr);
}
#else
#define init_mmu_slb_size(node) do { } while(0)
#endif
static struct feature_property {
const char *name;
u32 min_value;
unsigned long cpu_feature;
unsigned long cpu_user_ftr;
} feature_properties[] __initdata = {
#ifdef CONFIG_ALTIVEC
{"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
{"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
#endif /* CONFIG_ALTIVEC */
#ifdef CONFIG_VSX
/* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
{"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX},
#endif /* CONFIG_VSX */
#ifdef CONFIG_PPC64
{"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
{"ibm,purr", 1, CPU_FTR_PURR, 0},
{"ibm,spurr", 1, CPU_FTR_SPURR, 0},
#endif /* CONFIG_PPC64 */
};
#if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
static __init void identical_pvr_fixup(unsigned long node)
{
unsigned int pvr;
const char *model = of_get_flat_dt_prop(node, "model", NULL);
/*
* Since 440GR(x)/440EP(x) processors have the same pvr,
* we check the node path and set bit 28 in the cur_cpu_spec
* pvr for EP(x) processor version. This bit is always 0 in
* the "real" pvr. Then we call identify_cpu again with
* the new logical pvr to enable FPU support.
*/
if (model && strstr(model, "440EP")) {
pvr = cur_cpu_spec->pvr_value | 0x8;
identify_cpu(0, pvr);
DBG("Using logical pvr %x for %s\n", pvr, model);
}
}
#else
#define identical_pvr_fixup(node) do { } while(0)
#endif
static void __init check_cpu_feature_properties(unsigned long node)
{
int i;
struct feature_property *fp = feature_properties;
const __be32 *prop;
for (i = 0; i < (int)ARRAY_SIZE(feature_properties); ++i, ++fp) {
prop = of_get_flat_dt_prop(node, fp->name, NULL);
if (prop && be32_to_cpup(prop) >= fp->min_value) {
cur_cpu_spec->cpu_features |= fp->cpu_feature;
cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
}
}
}
static int __init early_init_dt_scan_cpus(unsigned long node,
const char *uname, int depth,
void *data)
{
const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
const __be32 *prop;
const __be32 *intserv;
int i, nthreads;
int len;
int found = -1;
int found_thread = 0;
/* We are scanning "cpu" nodes only */
if (type == NULL || strcmp(type, "cpu") != 0)
return 0;
/* Get physical cpuid */
intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
if (!intserv)
intserv = of_get_flat_dt_prop(node, "reg", &len);
nthreads = len / sizeof(int);
/*
* Now see if any of these threads match our boot cpu.
* NOTE: This must match the parsing done in smp_setup_cpu_maps.
*/
for (i = 0; i < nthreads; i++) {
if (be32_to_cpu(intserv[i]) ==
fdt_boot_cpuid_phys(initial_boot_params)) {
found = boot_cpu_count;
found_thread = i;
}
#ifdef CONFIG_SMP
/* logical cpu id is always 0 on UP kernels */
boot_cpu_count++;
#endif
}
/* Not the boot CPU */
if (found < 0)
return 0;
DBG("boot cpu: logical %d physical %d\n", found,
be32_to_cpu(intserv[found_thread]));
boot_cpuid = found;
if (IS_ENABLED(CONFIG_PPC64))
boot_cpu_hwid = be32_to_cpu(intserv[found_thread]);
/*
* PAPR defines "logical" PVR values for cpus that
* meet various levels of the architecture:
* 0x0f000001 Architecture version 2.04
* 0x0f000002 Architecture version 2.05
* If the cpu-version property in the cpu node contains
* such a value, we call identify_cpu again with the
* logical PVR value in order to use the cpu feature
* bits appropriate for the architecture level.
*
* A POWER6 partition in "POWER6 architected" mode
* uses the 0x0f000002 PVR value; in POWER5+ mode
* it uses 0x0f000001.
*
* If we're using device tree CPU feature discovery then we don't
* support the cpu-version property, and it's the responsibility of the
* firmware/hypervisor to provide the correct feature set for the
* architecture level via the ibm,powerpc-cpu-features binding.
*/
if (!dt_cpu_ftrs_in_use()) {
prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000) {
identify_cpu(0, be32_to_cpup(prop));
seq_buf_printf(&ppc_hw_desc, "0x%04x ", be32_to_cpup(prop));
}
check_cpu_feature_properties(node);
check_cpu_features(node, "ibm,pa-features", ibm_pa_features,
ARRAY_SIZE(ibm_pa_features));
check_cpu_features(node, "ibm,pi-features", ibm_pi_features,
ARRAY_SIZE(ibm_pi_features));
}
identical_pvr_fixup(node);
init_mmu_slb_size(node);
#ifdef CONFIG_PPC64
if (nthreads == 1)
cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
else if (!dt_cpu_ftrs_in_use())
cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
#endif
return 0;
}
static int __init early_init_dt_scan_chosen_ppc(unsigned long node,
const char *uname,
int depth, void *data)
{
const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */
/* Use common scan routine to determine if this is the chosen node */
if (early_init_dt_scan_chosen(data) < 0)
return 0;
#ifdef CONFIG_PPC64
/* check if iommu is forced on or off */
if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
iommu_is_off = 1;
if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
iommu_force_on = 1;
#endif
/* mem=x on the command line is the preferred mechanism */
lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
if (lprop)
memory_limit = *lprop;
#ifdef CONFIG_PPC64
lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
if (lprop)
tce_alloc_start = *lprop;
lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
if (lprop)
tce_alloc_end = *lprop;
#endif
#ifdef CONFIG_KEXEC_CORE
lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
if (lprop)
crashk_res.start = *lprop;
lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
if (lprop)
crashk_res.end = crashk_res.start + *lprop - 1;
#endif
/* break now */
return 1;
}
/*
* Compare the range against max mem limit and update
* size if it cross the limit.
*/
#ifdef CONFIG_SPARSEMEM
static bool __init validate_mem_limit(u64 base, u64 *size)
{
u64 max_mem = 1UL << (MAX_PHYSMEM_BITS);
if (base >= max_mem)
return false;
if ((base + *size) > max_mem)
*size = max_mem - base;
return true;
}
#else
static bool __init validate_mem_limit(u64 base, u64 *size)
{
return true;
}
#endif
#ifdef CONFIG_PPC_PSERIES
/*
* Interpret the ibm dynamic reconfiguration memory LMBs.
* This contains a list of memory blocks along with NUMA affinity
* information.
*/
static int __init early_init_drmem_lmb(struct drmem_lmb *lmb,
const __be32 **usm,
void *data)
{
u64 base, size;
int is_kexec_kdump = 0, rngs;
base = lmb->base_addr;
size = drmem_lmb_size();
rngs = 1;
/*
* Skip this block if the reserved bit is set in flags
* or if the block is not assigned to this partition.
*/
if ((lmb->flags & DRCONF_MEM_RESERVED) ||
!(lmb->flags & DRCONF_MEM_ASSIGNED))
return 0;
if (*usm)
is_kexec_kdump = 1;
if (is_kexec_kdump) {
/*
* For each memblock in ibm,dynamic-memory, a
* corresponding entry in linux,drconf-usable-memory
* property contains a counter 'p' followed by 'p'
* (base, size) duple. Now read the counter from
* linux,drconf-usable-memory property
*/
rngs = dt_mem_next_cell(dt_root_size_cells, usm);
if (!rngs) /* there are no (base, size) duple */
return 0;
}
do {
if (is_kexec_kdump) {
base = dt_mem_next_cell(dt_root_addr_cells, usm);
size = dt_mem_next_cell(dt_root_size_cells, usm);
}
if (iommu_is_off) {
if (base >= 0x80000000ul)
continue;
if ((base + size) > 0x80000000ul)
size = 0x80000000ul - base;
}
if (!validate_mem_limit(base, &size))
continue;
DBG("Adding: %llx -> %llx\n", base, size);
memblock_add(base, size);
if (lmb->flags & DRCONF_MEM_HOTREMOVABLE)
memblock_mark_hotplug(base, size);
} while (--rngs);
return 0;
}
#endif /* CONFIG_PPC_PSERIES */
static int __init early_init_dt_scan_memory_ppc(void)
{
#ifdef CONFIG_PPC_PSERIES
const void *fdt = initial_boot_params;
int node = fdt_path_offset(fdt, "/ibm,dynamic-reconfiguration-memory");
if (node > 0)
walk_drmem_lmbs_early(node, NULL, early_init_drmem_lmb);
#endif
return early_init_dt_scan_memory();
}
/*
* For a relocatable kernel, we need to get the memstart_addr first,
* then use it to calculate the virtual kernel start address. This has
* to happen at a very early stage (before machine_init). In this case,
* we just want to get the memstart_address and would not like to mess the
* memblock at this stage. So introduce a variable to skip the memblock_add()
* for this reason.
*/
#ifdef CONFIG_RELOCATABLE
static int add_mem_to_memblock = 1;
#else
#define add_mem_to_memblock 1
#endif
void __init early_init_dt_add_memory_arch(u64 base, u64 size)
{
#ifdef CONFIG_PPC64
if (iommu_is_off) {
if (base >= 0x80000000ul)
return;
if ((base + size) > 0x80000000ul)
size = 0x80000000ul - base;
}
#endif
/* Keep track of the beginning of memory -and- the size of
* the very first block in the device-tree as it represents
* the RMA on ppc64 server
*/
if (base < memstart_addr) {
memstart_addr = base;
first_memblock_size = size;
}
/* Add the chunk to the MEMBLOCK list */
if (add_mem_to_memblock) {
if (validate_mem_limit(base, &size))
memblock_add(base, size);
}
}
static void __init early_reserve_mem_dt(void)
{
unsigned long i, dt_root;
int len;
const __be32 *prop;
early_init_fdt_reserve_self();
early_init_fdt_scan_reserved_mem();
dt_root = of_get_flat_dt_root();
prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len);
if (!prop)
return;
DBG("Found new-style reserved-ranges\n");
/* Each reserved range is an (address,size) pair, 2 cells each,
* totalling 4 cells per range. */
for (i = 0; i < len / (sizeof(*prop) * 4); i++) {
u64 base, size;
base = of_read_number(prop + (i * 4) + 0, 2);
size = of_read_number(prop + (i * 4) + 2, 2);
if (size) {
DBG("reserving: %llx -> %llx\n", base, size);
memblock_reserve(base, size);
}
}
}
static void __init early_reserve_mem(void)
{
__be64 *reserve_map;
reserve_map = (__be64 *)(((unsigned long)initial_boot_params) +
fdt_off_mem_rsvmap(initial_boot_params));
/* Look for the new "reserved-regions" property in the DT */
early_reserve_mem_dt();
#ifdef CONFIG_BLK_DEV_INITRD
/* Then reserve the initrd, if any */
if (initrd_start && (initrd_end > initrd_start)) {
memblock_reserve(ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE),
ALIGN(initrd_end, PAGE_SIZE) -
ALIGN_DOWN(initrd_start, PAGE_SIZE));
}
#endif /* CONFIG_BLK_DEV_INITRD */
if (!IS_ENABLED(CONFIG_PPC32))
return;
/*
* Handle the case where we might be booting from an old kexec
* image that setup the mem_rsvmap as pairs of 32-bit values
*/
if (be64_to_cpup(reserve_map) > 0xffffffffull) {
u32 base_32, size_32;
__be32 *reserve_map_32 = (__be32 *)reserve_map;
DBG("Found old 32-bit reserve map\n");
while (1) {
base_32 = be32_to_cpup(reserve_map_32++);
size_32 = be32_to_cpup(reserve_map_32++);
if (size_32 == 0)
break;
DBG("reserving: %x -> %x\n", base_32, size_32);
memblock_reserve(base_32, size_32);
}
return;
}
}
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
static bool tm_disabled __initdata;
static int __init parse_ppc_tm(char *str)
{
bool res;
if (kstrtobool(str, &res))
return -EINVAL;
tm_disabled = !res;
return 0;
}
early_param("ppc_tm", parse_ppc_tm);
static void __init tm_init(void)
{
if (tm_disabled) {
pr_info("Disabling hardware transactional memory (HTM)\n");
cur_cpu_spec->cpu_user_features2 &=
~(PPC_FEATURE2_HTM_NOSC | PPC_FEATURE2_HTM);
cur_cpu_spec->cpu_features &= ~CPU_FTR_TM;
return;
}
pnv_tm_init();
}
#else
static void tm_init(void) { }
#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
static int __init
early_init_dt_scan_model(unsigned long node, const char *uname,
int depth, void *data)
{
const char *prop;
if (depth != 0)
return 0;
prop = of_get_flat_dt_prop(node, "model", NULL);
if (prop)
seq_buf_printf(&ppc_hw_desc, "%s ", prop);
/* break now */
return 1;
}
#ifdef CONFIG_PPC64
static void __init save_fscr_to_task(void)
{
/*
* Ensure the init_task (pid 0, aka swapper) uses the value of FSCR we
* have configured via the device tree features or via __init_FSCR().
* That value will then be propagated to pid 1 (init) and all future
* processes.
*/
if (early_cpu_has_feature(CPU_FTR_ARCH_207S))
init_task.thread.fscr = mfspr(SPRN_FSCR);
}
#else
static inline void save_fscr_to_task(void) {}
#endif
void __init early_init_devtree(void *params)
{
phys_addr_t limit;
DBG(" -> early_init_devtree(%px)\n", params);
/* Too early to BUG_ON(), do it by hand */
if (!early_init_dt_verify(params))
panic("BUG: Failed verifying flat device tree, bad version?");
of_scan_flat_dt(early_init_dt_scan_model, NULL);
#ifdef CONFIG_PPC_RTAS
/* Some machines might need RTAS info for debugging, grab it now. */
of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
#endif
#ifdef CONFIG_PPC_POWERNV
/* Some machines might need OPAL info for debugging, grab it now. */
of_scan_flat_dt(early_init_dt_scan_opal, NULL);
/* Scan tree for ultravisor feature */
of_scan_flat_dt(early_init_dt_scan_ultravisor, NULL);
#endif
#if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP)
/* scan tree to see if dump is active during last boot */
of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL);
#endif
/* Retrieve various informations from the /chosen node of the
* device-tree, including the platform type, initrd location and
* size, TCE reserve, and more ...
*/
of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line);
/* Scan memory nodes and rebuild MEMBLOCKs */
early_init_dt_scan_root();
early_init_dt_scan_memory_ppc();
/*
* As generic code authors expect to be able to use static keys
* in early_param() handlers, we initialize the static keys just
* before parsing early params (it's fine to call jump_label_init()
* more than once).
*/
jump_label_init();
parse_early_param();
/* make sure we've parsed cmdline for mem= before this */
if (memory_limit)
first_memblock_size = min_t(u64, first_memblock_size, memory_limit);
setup_initial_memory_limit(memstart_addr, first_memblock_size);
/* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
memblock_reserve(PHYSICAL_START, __pa(_end) - PHYSICAL_START);
/* If relocatable, reserve first 32k for interrupt vectors etc. */
if (PHYSICAL_START > MEMORY_START)
memblock_reserve(MEMORY_START, 0x8000);
reserve_kdump_trampoline();
#if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP)
/*
* If we fail to reserve memory for firmware-assisted dump then
* fallback to kexec based kdump.
*/
if (fadump_reserve_mem() == 0)
#endif
reserve_crashkernel();
early_reserve_mem();
/* Ensure that total memory size is page-aligned. */
limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE);
memblock_enforce_memory_limit(limit);
#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_PPC_4K_PAGES)
if (!early_radix_enabled())
memblock_cap_memory_range(0, 1UL << (H_MAX_PHYSMEM_BITS));
#endif
memblock_allow_resize();
memblock_dump_all();
DBG("Phys. mem: %llx\n", (unsigned long long)memblock_phys_mem_size());
/* We may need to relocate the flat tree, do it now.
* FIXME .. and the initrd too? */
move_device_tree();
DBG("Scanning CPUs ...\n");
dt_cpu_ftrs_scan();
// We can now add the CPU name & PVR to the hardware description
seq_buf_printf(&ppc_hw_desc, "%s 0x%04lx ", cur_cpu_spec->cpu_name, mfspr(SPRN_PVR));
/* Retrieve CPU related informations from the flat tree
* (altivec support, boot CPU ID, ...)
*/
of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
if (boot_cpuid < 0) {
printk("Failed to identify boot CPU !\n");
BUG();
}
save_fscr_to_task();
#if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
/* We'll later wait for secondaries to check in; there are
* NCPUS-1 non-boot CPUs :-)
*/
spinning_secondaries = boot_cpu_count - 1;
#endif
mmu_early_init_devtree();
#ifdef CONFIG_PPC_POWERNV
/* Scan and build the list of machine check recoverable ranges */
of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL);
#endif
epapr_paravirt_early_init();
/* Now try to figure out if we are running on LPAR and so on */
pseries_probe_fw_features();
/*
* Initialize pkey features and default AMR/IAMR values
*/
pkey_early_init_devtree();
#ifdef CONFIG_PPC_PS3
/* Identify PS3 firmware */
if (of_flat_dt_is_compatible(of_get_flat_dt_root(), "sony,ps3"))
powerpc_firmware_features |= FW_FEATURE_PS3_POSSIBLE;
#endif
tm_init();
DBG(" <- early_init_devtree()\n");
}
#ifdef CONFIG_RELOCATABLE
/*
* This function run before early_init_devtree, so we have to init
* initial_boot_params.
*/
void __init early_get_first_memblock_info(void *params, phys_addr_t *size)
{
/* Setup flat device-tree pointer */
initial_boot_params = params;
/*
* Scan the memory nodes and set add_mem_to_memblock to 0 to avoid
* mess the memblock.
*/
add_mem_to_memblock = 0;
early_init_dt_scan_root();
early_init_dt_scan_memory_ppc();
add_mem_to_memblock = 1;
if (size)
*size = first_memblock_size;
}
#endif
/*******
*
* New implementation of the OF "find" APIs, return a refcounted
* object, call of_node_put() when done. The device tree and list
* are protected by a rw_lock.
*
* Note that property management will need some locking as well,
* this isn't dealt with yet.
*
*******/
/**
* of_get_ibm_chip_id - Returns the IBM "chip-id" of a device
* @np: device node of the device
*
* This looks for a property "ibm,chip-id" in the node or any
* of its parents and returns its content, or -1 if it cannot
* be found.
*/
int of_get_ibm_chip_id(struct device_node *np)
{
of_node_get(np);
while (np) {
u32 chip_id;
/*
* Skiboot may produce memory nodes that contain more than one
* cell in chip-id, we only read the first one here.
*/
if (!of_property_read_u32(np, "ibm,chip-id", &chip_id)) {
of_node_put(np);
return chip_id;
}
np = of_get_next_parent(np);
}
return -1;
}
EXPORT_SYMBOL(of_get_ibm_chip_id);
/**
* cpu_to_chip_id - Return the cpus chip-id
* @cpu: The logical cpu number.
*
* Return the value of the ibm,chip-id property corresponding to the given
* logical cpu number. If the chip-id can not be found, returns -1.
*/
int cpu_to_chip_id(int cpu)
{
struct device_node *np;
int ret = -1, idx;
idx = cpu / threads_per_core;
if (chip_id_lookup_table && chip_id_lookup_table[idx] != -1)
return chip_id_lookup_table[idx];
np = of_get_cpu_node(cpu, NULL);
if (np) {
ret = of_get_ibm_chip_id(np);
of_node_put(np);
if (chip_id_lookup_table)
chip_id_lookup_table[idx] = ret;
}
return ret;
}
EXPORT_SYMBOL(cpu_to_chip_id);
bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
{
#ifdef CONFIG_SMP
/*
* Early firmware scanning must use this rather than
* get_hard_smp_processor_id because we don't have pacas allocated
* until memory topology is discovered.
*/
if (cpu_to_phys_id != NULL)
return (int)phys_id == cpu_to_phys_id[cpu];
#endif
return (int)phys_id == get_hard_smp_processor_id(cpu);
}
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