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-rw-r--r--arch/powerpc/kernel/prom.c74
1 files changed, 58 insertions, 16 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 0b5878c3125b..e0059842a1c6 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -151,6 +151,9 @@ static void __init move_device_tree(void)
* 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 */
@@ -159,7 +162,7 @@ struct ibm_feature {
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 */
+ unsigned char clear; /* if 1, pa bit set => clear feature */
};
static struct ibm_feature ibm_pa_features[] __initdata = {
@@ -193,6 +196,7 @@ static struct ibm_feature ibm_pa_features[] __initdata = {
*/
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,
@@ -220,12 +224,12 @@ static void __init scan_features(unsigned long node, const unsigned char *ftrs,
if (fp->pabyte >= ftrs[0])
continue;
bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
- if (bit ^ fp->invert) {
+ 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 {
+ } 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;
@@ -327,6 +331,7 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
void *data)
{
const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
+ const __be32 *cpu_version = NULL;
const __be32 *prop;
const __be32 *intserv;
int i, nthreads;
@@ -368,13 +373,31 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
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]);
+ 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:
@@ -398,7 +421,7 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
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));
+ cpu_version = prop;
}
check_cpu_feature_properties(node);
@@ -409,6 +432,12 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
}
identical_pvr_fixup(node);
+
+ // 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));
+ if (cpu_version)
+ seq_buf_printf(&ppc_hw_desc, "0x%04x ", be32_to_cpup(cpu_version));
+
init_mmu_slb_size(node);
#ifdef CONFIG_PPC64
@@ -453,7 +482,7 @@ static int __init early_init_dt_scan_chosen_ppc(unsigned long node,
tce_alloc_end = *lprop;
#endif
-#ifdef CONFIG_KEXEC_CORE
+#ifdef CONFIG_CRASH_RESERVE
lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
if (lprop)
crashk_res.start = *lprop;
@@ -757,12 +786,12 @@ static inline void save_fscr_to_task(void) {}
void __init early_init_devtree(void *params)
{
- phys_addr_t limit;
+ phys_addr_t int_vector_size;
DBG(" -> early_init_devtree(%px)\n", params);
/* Too early to BUG_ON(), do it by hand */
- if (!early_init_dt_verify(params))
+ if (!early_init_dt_verify(params, __pa(params)))
panic("BUG: Failed verifying flat device tree, bad version?");
of_scan_flat_dt(early_init_dt_scan_model, NULL);
@@ -791,6 +820,9 @@ void __init early_init_devtree(void *params)
*/
of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line);
+ /* Append additional parameters passed for fadump capture kernel */
+ fadump_append_bootargs();
+
/* Scan memory nodes and rebuild MEMBLOCKs */
early_init_dt_scan_root();
early_init_dt_scan_memory_ppc();
@@ -810,9 +842,16 @@ void __init early_init_devtree(void *params)
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);
+#ifdef CONFIG_PPC64
+ /* If relocatable, reserve at least 32k for interrupt vectors etc. */
+ int_vector_size = __end_interrupts - _stext;
+ int_vector_size = max_t(phys_addr_t, SZ_32K, int_vector_size);
+#else
/* If relocatable, reserve first 32k for interrupt vectors etc. */
+ int_vector_size = SZ_32K;
+#endif
if (PHYSICAL_START > MEMORY_START)
- memblock_reserve(MEMORY_START, 0x8000);
+ memblock_reserve(MEMORY_START, int_vector_size);
reserve_kdump_trampoline();
#if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP)
/*
@@ -824,9 +863,12 @@ void __init early_init_devtree(void *params)
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 (memory_limit > memblock_phys_mem_size())
+ memory_limit = 0;
+
+ /* Align down to 16 MB which is large page size with hash page translation */
+ memory_limit = ALIGN_DOWN(memory_limit ?: memblock_phys_mem_size(), SZ_16M);
+ memblock_enforce_memory_limit(memory_limit);
#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_PPC_4K_PAGES)
if (!early_radix_enabled())
@@ -846,9 +888,6 @@ void __init early_init_devtree(void *params)
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, ...)
*/
@@ -869,6 +908,9 @@ void __init early_init_devtree(void *params)
mmu_early_init_devtree();
+ /* Setup param area for passing additional parameters to fadump capture kernel. */
+ fadump_setup_param_area();
+
#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);
generated by cgit (git 2.34.1) at 2025-07-23 08:57:31 +0000