1 files changed, 181 insertions, 128 deletions

diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 488f1eecc0de..68d47c53876c 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -9,6 +9,7 @@
 #undef DEBUG
 
 #include <linux/export.h>
+#include <linux/panic_notifier.h>
 #include <linux/string.h>
 #include <linux/sched.h>
 #include <linux/init.h>
@@ -17,27 +18,27 @@
 #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/notifier.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_platform.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/of_irq.h>
 #include <linux/hugetlb.h>
-#include <asm/debugfs.h>
+#include <linux/pgtable.h>
 #include <asm/io.h>
 #include <asm/paca.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>
@@ -57,6 +58,7 @@
 #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>
@@ -64,11 +66,12 @@
 #include <asm/mmu_context.h>
 #include <asm/cpu_has_feature.h>
 #include <asm/kasan.h>
+#include <asm/mce.h>
+#include <asm/systemcfg.h>
 
 #include "setup.h"
 
 #ifdef DEBUG
-#include <asm/udbg.h>
 #define DBG(fmt...) udbg_printf(fmt)
 #else
 #define DBG(fmt...)
@@ -83,6 +86,11 @@ EXPORT_SYMBOL(machine_id);
 
 int boot_cpuid = -1;
 EXPORT_SYMBOL_GPL(boot_cpuid);
+int __initdata boot_core_hwid = -1;
+
+#ifdef CONFIG_PPC64
+int boot_cpu_hwid = -1;
+#endif
 
 /*
  * These are used in binfmt_elf.c to put aux entries on the stack
@@ -90,25 +98,6 @@ EXPORT_SYMBOL_GPL(boot_cpuid);
  */
 int dcache_bsize;
 int icache_bsize;
-int ucache_bsize;
-
-
-unsigned long klimit = (unsigned long) _end;
-
-/*
- * 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;
@@ -122,7 +111,7 @@ int ppc_do_canonicalize_irqs;
 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
 #endif
 
-#ifdef CONFIG_CRASH_CORE
+#ifdef CONFIG_CRASH_DUMP
 /* This keeps a track of which one is the crashing cpu. */
 int crashing_cpu = -1;
 #endif
@@ -165,9 +154,7 @@ void machine_restart(char *cmd)
 void machine_power_off(void)
 {
 	machine_shutdown();
-	if (pm_power_off)
-		pm_power_off();
-
+	do_kernel_power_off();
 	smp_send_stop();
 	machine_hang();
 }
@@ -177,6 +164,14 @@ 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();
@@ -239,18 +234,17 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 	maj = (pvr >> 8) & 0xFF;
 	min = pvr & 0xFF;
 
-	seq_printf(m, "processor\t: %lu\n", cpu_id);
-	seq_printf(m, "cpu\t\t: ");
+	seq_printf(m, "processor\t: %lu\ncpu\t\t: ", cpu_id);
 
 	if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name)
-		seq_printf(m, "%s", 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_printf(m, ", altivec supported");
+		seq_puts(m, ", altivec supported");
 
-	seq_printf(m, "\n");
+	seq_putc(m, '\n');
 
 #ifdef CONFIG_TAU
 	if (cpu_has_feature(CPU_FTR_TAU)) {
@@ -283,11 +277,8 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 		seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 			   proc_freq / 1000000, 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 */
+	 * 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 */
@@ -306,15 +297,12 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 		}
 	} 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;
 			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;
@@ -332,7 +320,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 		seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ),
 			   (loops_per_jiffy / (5000 / HZ)) % 100);
 
-	seq_printf(m, "\n");
+	seq_putc(m, '\n');
 
 	/* If this is the last cpu, print the summary */
 	if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
@@ -418,13 +406,32 @@ static void __init cpu_init_thread_core_maps(int tpc)
 		cpumask_set_cpu(i, &threads_core_mask);
 
 	printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
-	       tpc, tpc > 1 ? "s" : "");
+	       tpc, str_plural(tpc));
 	printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 }
 
 
 u32 *cpu_to_phys_id = NULL;
 
+static int assign_threads(unsigned int cpu, unsigned int nthreads, bool present,
+			  const __be32 *hw_ids)
+{
+	for (int i = 0; i < nthreads && cpu < nr_cpu_ids; i++) {
+		__be32 hwid;
+
+		hwid = be32_to_cpu(hw_ids[i]);
+
+		DBG("    thread %d -> cpu %d (hard id %d)\n", i, cpu, hwid);
+
+		set_cpu_present(cpu, present);
+		set_cpu_possible(cpu, true);
+		cpu_to_phys_id[cpu] = hwid;
+		cpu++;
+	}
+
+	return cpu;
+}
+
 /**
  * setup_cpu_maps - initialize the following cpu maps:
  *                  cpu_possible_mask
@@ -451,24 +458,21 @@ void __init smp_setup_cpu_maps(void)
 
 	DBG("smp_setup_cpu_maps()\n");
 
-	cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32),
+	cpu_to_phys_id = memblock_alloc_or_panic(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;
+		int len;
 
 		DBG("  * %pOF...\n", dn);
 
 		intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 				&len);
 		if (intserv) {
-			DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
-			    nthreads);
+			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);
@@ -482,27 +486,31 @@ void __init smp_setup_cpu_maps(void)
 
 		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");
+		bool 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 (boot_core_hwid >= 0) {
+			if (cpu == 0) {
+				pr_info("Skipping CPU node %pOF to allow for boot core.\n", dn);
+				cpu = nthreads;
+				continue;
+			}
 
-		if (cpu >= nr_cpu_ids) {
+			if (be32_to_cpu(intserv[0]) == boot_core_hwid) {
+				pr_info("Renumbered boot core %pOF to logical 0\n", dn);
+				assign_threads(0, nthreads, avail, intserv);
+				of_node_put(dn);
+				break;
+			}
+		} else if (cpu >= nr_cpu_ids) {
 			of_node_put(dn);
 			break;
 		}
+
+		if (cpu < nr_cpu_ids)
+			cpu = assign_threads(cpu, nthreads, avail, intserv);
 	}
 
 	/* If no SMT supported, nthreads is forced to 1 */
@@ -550,7 +558,9 @@ void __init smp_setup_cpu_maps(void)
 	out:
 		of_node_put(dn);
 	}
-	vdso_data->processorCount = num_present_cpus();
+#endif
+#ifdef CONFIG_PPC64_PROC_SYSTEMCFG
+	systemcfg->processorCount = num_present_cpus();
 #endif /* CONFIG_PPC64 */
 
         /* Initialize CPU <=> thread mapping/
@@ -593,7 +603,15 @@ static __init int add_pcspkr(void)
 device_initcall(add_pcspkr);
 #endif	/* CONFIG_PCSPKR_PLATFORM */
 
-void probe_machine(void)
+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,
+};
+
+static __init void probe_machine(void)
 {
 	extern struct machdep_calls __machine_desc_start;
 	extern struct machdep_calls __machine_desc_end;
@@ -619,13 +637,16 @@ void probe_machine(void)
 	for (machine_id = &__machine_desc_start;
 	     machine_id < &__machine_desc_end;
 	     machine_id++) {
-		DBG("  %s ...", machine_id->name);
+		DBG("  %s ...\n", machine_id->name);
+		if (machine_id->compatible && !of_machine_is_compatible(machine_id->compatible))
+			continue;
+		if (machine_id->compatibles && !of_machine_compatible_match(machine_id->compatibles))
+			continue;
 		memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
-		if (ppc_md.probe()) {
-			DBG(" match !\n");
-			break;
-		}
-		DBG("\n");
+		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) {
@@ -633,7 +654,13 @@ void probe_machine(void)
 		for (;;);
 	}
 
-	printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
+	// 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. */
@@ -691,8 +718,25 @@ int check_legacy_ioport(unsigned long base_port)
 }
 EXPORT_SYMBOL(check_legacy_ioport);
 
-static int ppc_panic_event(struct notifier_block *this,
-                             unsigned long event, void *ptr)
+/*
+ * 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
@@ -702,45 +746,63 @@ static int ppc_panic_event(struct notifier_block *this,
 
 	/*
 	 * If firmware-assisted dump has been registered then trigger
-	 * firmware-assisted dump and let firmware handle everything else.
+	 * its callback and let the firmware handles everything else.
 	 */
 	crash_fadump(NULL, ptr);
-	if (ppc_md.panic)
-		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 */
-};
-
-/*
- * Dump out kernel offset information on panic.
- */
 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 0;
+	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
+	.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);
 
-	/* PPC64 always does a hard irq disable in its panic handler */
-	if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic)
-		return;
-	atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
+	/* 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
@@ -769,8 +831,8 @@ static int __init check_cache_coherency(void)
 	if (devtree_coherency != KERNEL_COHERENCY) {
 		printk(KERN_ERR
 			"kernel coherency:%s != device tree_coherency:%s\n",
-			KERNEL_COHERENCY ? "on" : "off",
-			devtree_coherency ? "on" : "off");
+			str_on_off(KERNEL_COHERENCY),
+			str_on_off(devtree_coherency));
 		BUG();
 	}
 
@@ -780,19 +842,6 @@ static int __init check_cache_coherency(void)
 late_initcall(check_cache_coherency);
 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 
-#ifdef CONFIG_DEBUG_FS
-struct dentry *powerpc_debugfs_root;
-EXPORT_SYMBOL(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
-
 void ppc_printk_progress(char *s, unsigned short hex)
 {
 	pr_info("%s\n", s);
@@ -806,8 +855,6 @@ static __init void print_system_info(void)
 
 	pr_info("dcache_bsize      = 0x%x\n", dcache_bsize);
 	pr_info("icache_bsize      = 0x%x\n", icache_bsize);
-	if (ucache_bsize != 0)
-		pr_info("ucache_bsize      = 0x%x\n", ucache_bsize);
 
 	pr_info("cpu_features      = 0x%016lx\n", cur_cpu_spec->cpu_features);
 	pr_info("  possible        = 0x%016lx\n",
@@ -837,7 +884,7 @@ static __init void print_system_info(void)
 }
 
 #ifdef CONFIG_SMP
-static void smp_setup_pacas(void)
+static void __init smp_setup_pacas(void)
 {
 	int cpu;
 
@@ -848,7 +895,7 @@ static void smp_setup_pacas(void)
 		set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
 	}
 
-	memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32));
+	memblock_free(cpu_to_phys_id, nr_cpu_ids * sizeof(u32));
 	cpu_to_phys_id = NULL;
 }
 #endif
@@ -910,6 +957,7 @@ void __init setup_arch(char **cmdline_p)
 
 	/* Parse memory topology */
 	mem_topology_setup();
+	high_memory = (void *)__va(max_low_pfn * PAGE_SIZE);
 
 	/*
 	 * Release secondary cpus out of their spinloops at 0x60 now that
@@ -923,34 +971,39 @@ void __init setup_arch(char **cmdline_p)
 
 	/* On BookE, setup per-core TLB data structures. */
 	setup_tlb_core_data();
-
-	smp_release_cpus();
 #endif
 
 	/* Print various info about the machine that has been gathered so far. */
 	print_system_info();
 
-	/* Reserve large chunks of memory for use by CMA for KVM. */
-	kvm_cma_reserve();
-
 	klp_init_thread_info(&init_task);
 
-	init_mm.start_code = (unsigned long)_stext;
-	init_mm.end_code = (unsigned long) _etext;
-	init_mm.end_data = (unsigned long) _edata;
-	init_mm.brk = klimit;
-
+	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();
 
-	early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
+	/*
+	 * Reserve large chunks of memory for use by CMA for fadump, KVM and
+	 * hugetlb. These must be called after initmem_init(), so that
+	 * pageblock_order is initialised.
+	 */
+	fadump_cma_init();
+	kvm_cma_reserve();
+	gigantic_hugetlb_cma_reserve();
 
-	if (IS_ENABLED(CONFIG_DUMMY_CONSOLE))
-		conswitchp = &dummy_con;
+	early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
 
 	if (ppc_md.setup_arch)
 		ppc_md.setup_arch();