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2024-05-10 10ebd8556b7990499c896a550e3d416b444211e6

 kernel/arch/powerpc/platforms/powernv/setup.c
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@@ -1,12 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * PowerNV setup code.
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  *
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  * Copyright 2011 IBM Corp.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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  */
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 #undef DEBUG
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@@ -28,6 +24,7 @@
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 #include <linux/bug.h>
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 #include <linux/pci.h>
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 #include <linux/cpufreq.h>
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+#include <linux/memblock.h>
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 #include <asm/machdep.h>
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 #include <asm/firmware.h>
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@@ -101,7 +98,7 @@
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 		security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR);
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 }
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-static void pnv_setup_rfi_flush(void)
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+static void pnv_setup_security_mitigations(void)
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 {
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 	struct device_node *np, *fw_features;
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 	enum l1d_flush_type type;
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@@ -148,14 +145,37 @@
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 	enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
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 		 security_ftr_enabled(SEC_FTR_L1D_FLUSH_UACCESS);
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 	setup_uaccess_flush(enable);
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+
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+	setup_stf_barrier();
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+}
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+
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+static void __init pnv_check_guarded_cores(void)
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+{
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+	struct device_node *dn;
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+	int bad_count = 0;
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+
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+	for_each_node_by_type(dn, "cpu") {
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+		if (of_property_match_string(dn, "status", "bad") >= 0)
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+			bad_count++;
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+	};
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+
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+	if (bad_count) {
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+		printk("  _     _______________\n");
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+		pr_cont(" | |   /               \\\n");
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+		pr_cont(" | |   |    WARNING!   |\n");
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+		pr_cont(" | |   |               |\n");
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+		pr_cont(" | |   | It looks like |\n");
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+		pr_cont(" |_|   |  you have %*d |\n", 3, bad_count);
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+		pr_cont("  _    | guarded cores |\n");
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+		pr_cont(" (_)   \\_______________/\n");
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+	}
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 }
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 static void __init pnv_setup_arch(void)
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 {
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 	set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
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-	pnv_setup_rfi_flush();
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-	setup_stf_barrier();
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+	pnv_setup_security_mitigations();
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 	/* Initialize SMP */
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 	pnv_smp_init();
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@@ -170,7 +190,11 @@
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 	/* Enable NAP mode */
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 	powersave_nap = 1;
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192
 
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+	pnv_check_guarded_cores();
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+
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 	/* XXX PMCS */
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+
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+	pnv_rng_init();
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 }
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 static void __init pnv_init(void)
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@@ -187,6 +211,19 @@
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 	else
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 #endif
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 		add_preferred_console("hvc", 0, NULL);
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+
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+	if (!radix_enabled()) {
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+		size_t size = sizeof(struct slb_entry) * mmu_slb_size;
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+		int i;
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+
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+		/* Allocate per cpu area to save old slb contents during MCE */
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+		for_each_possible_cpu(i) {
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+			paca_ptrs[i]->mce_faulty_slbs =
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+					memblock_alloc_node(size,
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+						__alignof__(struct slb_entry),
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+						cpu_to_node(i));
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+		}
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+	}
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 }
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 static void __init pnv_init_IRQ(void)
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@@ -236,17 +273,47 @@
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 static void  __noreturn pnv_restart(char *cmd)
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 {
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-	long rc = OPAL_BUSY;
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+	long rc;
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 	pnv_prepare_going_down();
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-	while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
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-		rc = opal_cec_reboot();
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-		if (rc == OPAL_BUSY_EVENT)
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-			opal_poll_events(NULL);
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+	do {
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+		if (!cmd || !strlen(cmd))
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+			rc = opal_cec_reboot();
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+		else if (strcmp(cmd, "full") == 0)
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+			rc = opal_cec_reboot2(OPAL_REBOOT_FULL_IPL, NULL);
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+		else if (strcmp(cmd, "mpipl") == 0)
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+			rc = opal_cec_reboot2(OPAL_REBOOT_MPIPL, NULL);
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+		else if (strcmp(cmd, "error") == 0)
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+			rc = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, NULL);
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+		else if (strcmp(cmd, "fast") == 0)
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+			rc = opal_cec_reboot2(OPAL_REBOOT_FAST, NULL);
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 		else
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+			rc = OPAL_UNSUPPORTED;
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+
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+		if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
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+			/* Opal is busy wait for some time and retry */
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+			opal_poll_events(NULL);
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 			mdelay(10);
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-	}
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+
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+		} else	if (cmd && rc) {
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+			/* Unknown error while issuing reboot */
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+			if (rc == OPAL_UNSUPPORTED)
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+				pr_err("Unsupported '%s' reboot.\n", cmd);
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+			else
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+				pr_err("Unable to issue '%s' reboot. Err=%ld\n",
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+				       cmd, rc);
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+			pr_info("Forcing a cec-reboot\n");
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+			cmd = NULL;
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+			rc = OPAL_BUSY;
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+
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+		} else if (rc != OPAL_SUCCESS) {
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+			/* Unknown error while issuing cec-reboot */
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+			pr_err("Unable to reboot. Err=%ld\n", rc);
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+		}
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+
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+	} while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT);
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+
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 	for (;;)
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 		opal_poll_events(NULL);
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 }
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@@ -381,7 +448,15 @@
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 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
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 static unsigned long pnv_memory_block_size(void)
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 {
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-	return 256UL * 1024 * 1024;
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+	/*
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+	 * We map the kernel linear region with 1GB large pages on radix. For
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+	 * memory hot unplug to work our memory block size must be at least
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+	 * this size.
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+	 */
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+	if (radix_enabled())
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+		return radix_mem_block_size;
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+	else
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+		return 256UL * 1024 * 1024;
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 }
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 #endif
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@@ -394,7 +469,10 @@
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 	/* ppc_md.system_reset_exception gets filled in by pnv_smp_init() */
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 	ppc_md.machine_check_exception = opal_machine_check;
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 	ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery;
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-	ppc_md.hmi_exception_early = opal_hmi_exception_early;
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+	if (opal_check_token(OPAL_HANDLE_HMI2))
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+		ppc_md.hmi_exception_early = opal_hmi_exception_early2;
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+	else
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+		ppc_md.hmi_exception_early = opal_hmi_exception_early;
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 	ppc_md.handle_hmi_exception = opal_handle_hmi_exception;
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 }
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@@ -454,6 +532,16 @@
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 	return ret_freq;
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 }
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+static long pnv_machine_check_early(struct pt_regs *regs)
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+{
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+	long handled = 0;
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+
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+	if (cur_cpu_spec && cur_cpu_spec->machine_check_early)
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+		handled = cur_cpu_spec->machine_check_early(regs);
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+
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+	return handled;
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+}
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+
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 define_machine(powernv) {
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 	.name			= "PowerNV",
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 	.probe			= pnv_probe,
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@@ -465,6 +553,7 @@
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 	.machine_shutdown	= pnv_shutdown,
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 	.power_save             = NULL,
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 	.calibrate_decr		= generic_calibrate_decr,
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+	.machine_check_early	= pnv_machine_check_early,
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 #ifdef CONFIG_KEXEC_CORE
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 	.kexec_cpu_down		= pnv_kexec_cpu_down,
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 #endif