linux-stable/arch/powerpc/kernel/prom.c
Nicholas Piggin 6e9de2054e powerpc/pseries: Set CPU_FTR_DBELL according to ibm,pi-features
PAPR will define a new ibm,pi-features bit which says that doorbells
should not be used even on architectures where they exist. This could be
because they are emulated and slower than using the interrupt controller
directly for IPIs.

Wire this bit into the pi-features parser to clear CPU_FTR_DBELL, and
ensure CPU_FTR_DBELL is not in CPU_FTRS_ALWAYS.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Tested-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240207035220.339726-2-npiggin@gmail.com
2024-02-21 23:14:52 +11:00

1028 lines
27 KiB
C

// 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 <asm/plpks.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;
unsigned int boot_cpu_node_count __ro_after_init;
#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.
* Note: the 'clear' flag clears the feature if the bit is set in the
* ibm,pa/pi-features property, it does not set the feature if the
* bit is clear.
*/
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 clear; /* 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 },
{ .pabyte = 68, .pabit = 5, .cpu_features = CPU_FTR_DEXCR_NPHIE },
};
/*
* 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 },
{ .pabyte = 0, .pabit = 4, .cpu_features = CPU_FTR_DBELL, .clear = 1 },
};
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->clear) {
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 if (bit == fp->clear) {
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;
if (IS_ENABLED(CONFIG_PPC64))
boot_cpu_node_count++;
/* 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;
boot_cpuid = found;
if (IS_ENABLED(CONFIG_PPC64))
boot_cpu_hwid = be32_to_cpu(intserv[found_thread]);
if (nr_cpu_ids % nthreads != 0) {
set_nr_cpu_ids(ALIGN(nr_cpu_ids, nthreads));
pr_warn("nr_cpu_ids was not a multiple of threads_per_core, adjusted to %d\n",
nr_cpu_ids);
}
if (boot_cpuid >= nr_cpu_ids) {
// Remember boot core for smp_setup_cpu_maps()
boot_core_hwid = be32_to_cpu(intserv[0]);
pr_warn("Boot CPU %d (core hwid %d) >= nr_cpu_ids, adjusted boot CPU to %d\n",
boot_cpuid, boot_core_hwid, found_thread);
// Adjust boot CPU to appear on logical core 0
boot_cpuid = found_thread;
}
DBG("boot cpu: logical %d physical %d\n", boot_cpuid,
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
/* If kexec left a PLPKS password in the DT, get it and clear it */
plpks_early_init_devtree();
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);
}