1 files changed, 474 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
new file mode 100644
index 000000000..5068dd7f6
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -0,0 +1,474 @@
+/*
+ * PowerNV setup code.
+ *
+ * Copyright 2011 IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#undef DEBUG
+
+#include <linux/cpu.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/tty.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/seq_file.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/interrupt.h>
+#include <linux/bug.h>
+#include <linux/pci.h>
+#include <linux/cpufreq.h>
+
+#include <asm/machdep.h>
+#include <asm/firmware.h>
+#include <asm/xics.h>
+#include <asm/xive.h>
+#include <asm/opal.h>
+#include <asm/kexec.h>
+#include <asm/smp.h>
+#include <asm/tm.h>
+#include <asm/setup.h>
+#include <asm/security_features.h>
+
+#include "powernv.h"
+
+
+static bool fw_feature_is(const char *state, const char *name,
+			  struct device_node *fw_features)
+{
+	struct device_node *np;
+	bool rc = false;
+
+	np = of_get_child_by_name(fw_features, name);
+	if (np) {
+		rc = of_property_read_bool(np, state);
+		of_node_put(np);
+	}
+
+	return rc;
+}
+
+static void init_fw_feat_flags(struct device_node *np)
+{
+	if (fw_feature_is("enabled", "inst-spec-barrier-ori31,31,0", np))
+		security_ftr_set(SEC_FTR_SPEC_BAR_ORI31);
+
+	if (fw_feature_is("enabled", "fw-bcctrl-serialized", np))
+		security_ftr_set(SEC_FTR_BCCTRL_SERIALISED);
+
+	if (fw_feature_is("enabled", "inst-l1d-flush-ori30,30,0", np))
+		security_ftr_set(SEC_FTR_L1D_FLUSH_ORI30);
+
+	if (fw_feature_is("enabled", "inst-l1d-flush-trig2", np))
+		security_ftr_set(SEC_FTR_L1D_FLUSH_TRIG2);
+
+	if (fw_feature_is("enabled", "fw-l1d-thread-split", np))
+		security_ftr_set(SEC_FTR_L1D_THREAD_PRIV);
+
+	if (fw_feature_is("enabled", "fw-count-cache-disabled", np))
+		security_ftr_set(SEC_FTR_COUNT_CACHE_DISABLED);
+
+	if (fw_feature_is("enabled", "fw-count-cache-flush-bcctr2,0,0", np))
+		security_ftr_set(SEC_FTR_BCCTR_FLUSH_ASSIST);
+
+	if (fw_feature_is("enabled", "needs-count-cache-flush-on-context-switch", np))
+		security_ftr_set(SEC_FTR_FLUSH_COUNT_CACHE);
+
+	/*
+	 * The features below are enabled by default, so we instead look to see
+	 * if firmware has *disabled* them, and clear them if so.
+	 */
+	if (fw_feature_is("disabled", "speculation-policy-favor-security", np))
+		security_ftr_clear(SEC_FTR_FAVOUR_SECURITY);
+
+	if (fw_feature_is("disabled", "needs-l1d-flush-msr-pr-0-to-1", np))
+		security_ftr_clear(SEC_FTR_L1D_FLUSH_PR);
+
+	if (fw_feature_is("disabled", "needs-l1d-flush-msr-hv-1-to-0", np))
+		security_ftr_clear(SEC_FTR_L1D_FLUSH_HV);
+
+	if (fw_feature_is("disabled", "needs-spec-barrier-for-bound-checks", np))
+		security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR);
+}
+
+static void pnv_setup_rfi_flush(void)
+{
+	struct device_node *np, *fw_features;
+	enum l1d_flush_type type;
+	bool enable;
+
+	/* Default to fallback in case fw-features are not available */
+	type = L1D_FLUSH_FALLBACK;
+
+	np = of_find_node_by_name(NULL, "ibm,opal");
+	fw_features = of_get_child_by_name(np, "fw-features");
+	of_node_put(np);
+
+	if (fw_features) {
+		init_fw_feat_flags(fw_features);
+		of_node_put(fw_features);
+
+		if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_TRIG2))
+			type = L1D_FLUSH_MTTRIG;
+
+		if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_ORI30))
+			type = L1D_FLUSH_ORI;
+	}
+
+	/*
+	 * If we are non-Power9 bare metal, we don't need to flush on kernel
+	 * entry or after user access: they fix a P9 specific vulnerability.
+	 */
+	if (!pvr_version_is(PVR_POWER9)) {
+		security_ftr_clear(SEC_FTR_L1D_FLUSH_ENTRY);
+		security_ftr_clear(SEC_FTR_L1D_FLUSH_UACCESS);
+	}
+
+	enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && \
+		 (security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR)   || \
+		  security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV));
+
+	setup_rfi_flush(type, enable);
+	setup_count_cache_flush();
+
+	enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
+		 security_ftr_enabled(SEC_FTR_L1D_FLUSH_ENTRY);
+	setup_entry_flush(enable);
+
+	enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
+		 security_ftr_enabled(SEC_FTR_L1D_FLUSH_UACCESS);
+	setup_uaccess_flush(enable);
+}
+
+static void __init pnv_setup_arch(void)
+{
+	set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
+
+	pnv_setup_rfi_flush();
+	setup_stf_barrier();
+
+	/* Initialize SMP */
+	pnv_smp_init();
+
+	/* Setup PCI */
+	pnv_pci_init();
+
+	/* Setup RTC and NVRAM callbacks */
+	if (firmware_has_feature(FW_FEATURE_OPAL))
+		opal_nvram_init();
+
+	/* Enable NAP mode */
+	powersave_nap = 1;
+
+	/* XXX PMCS */
+}
+
+static void __init pnv_init(void)
+{
+	/*
+	 * Initialize the LPC bus now so that legacy serial
+	 * ports can be found on it
+	 */
+	opal_lpc_init();
+
+#ifdef CONFIG_HVC_OPAL
+	if (firmware_has_feature(FW_FEATURE_OPAL))
+		hvc_opal_init_early();
+	else
+#endif
+		add_preferred_console("hvc", 0, NULL);
+}
+
+static void __init pnv_init_IRQ(void)
+{
+	/* Try using a XIVE if available, otherwise use a XICS */
+	if (!xive_native_init())
+		xics_init();
+
+	WARN_ON(!ppc_md.get_irq);
+}
+
+static void pnv_show_cpuinfo(struct seq_file *m)
+{
+	struct device_node *root;
+	const char *model = "";
+
+	root = of_find_node_by_path("/");
+	if (root)
+		model = of_get_property(root, "model", NULL);
+	seq_printf(m, "machine\t\t: PowerNV %s\n", model);
+	if (firmware_has_feature(FW_FEATURE_OPAL))
+		seq_printf(m, "firmware\t: OPAL\n");
+	else
+		seq_printf(m, "firmware\t: BML\n");
+	of_node_put(root);
+	if (radix_enabled())
+		seq_printf(m, "MMU\t\t: Radix\n");
+	else
+		seq_printf(m, "MMU\t\t: Hash\n");
+}
+
+static void pnv_prepare_going_down(void)
+{
+	/*
+	 * Disable all notifiers from OPAL, we can't
+	 * service interrupts anymore anyway
+	 */
+	opal_event_shutdown();
+
+	/* Print flash update message if one is scheduled. */
+	opal_flash_update_print_message();
+
+	smp_send_stop();
+
+	hard_irq_disable();
+}
+
+static void  __noreturn pnv_restart(char *cmd)
+{
+	long rc = OPAL_BUSY;
+
+	pnv_prepare_going_down();
+
+	while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
+		rc = opal_cec_reboot();
+		if (rc == OPAL_BUSY_EVENT)
+			opal_poll_events(NULL);
+		else
+			mdelay(10);
+	}
+	for (;;)
+		opal_poll_events(NULL);
+}
+
+static void __noreturn pnv_power_off(void)
+{
+	long rc = OPAL_BUSY;
+
+	pnv_prepare_going_down();
+
+	while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
+		rc = opal_cec_power_down(0);
+		if (rc == OPAL_BUSY_EVENT)
+			opal_poll_events(NULL);
+		else
+			mdelay(10);
+	}
+	for (;;)
+		opal_poll_events(NULL);
+}
+
+static void __noreturn pnv_halt(void)
+{
+	pnv_power_off();
+}
+
+static void pnv_progress(char *s, unsigned short hex)
+{
+}
+
+static void pnv_shutdown(void)
+{
+	/* Let the PCI code clear up IODA tables */
+	pnv_pci_shutdown();
+
+	/*
+	 * Stop OPAL activity: Unregister all OPAL interrupts so they
+	 * don't fire up while we kexec and make sure all potentially
+	 * DMA'ing ops are complete (such as dump retrieval).
+	 */
+	opal_shutdown();
+}
+
+#ifdef CONFIG_KEXEC_CORE
+static void pnv_kexec_wait_secondaries_down(void)
+{
+	int my_cpu, i, notified = -1;
+
+	my_cpu = get_cpu();
+
+	for_each_online_cpu(i) {
+		uint8_t status;
+		int64_t rc, timeout = 1000;
+
+		if (i == my_cpu)
+			continue;
+
+		for (;;) {
+			rc = opal_query_cpu_status(get_hard_smp_processor_id(i),
+						   &status);
+			if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED)
+				break;
+			barrier();
+			if (i != notified) {
+				printk(KERN_INFO "kexec: waiting for cpu %d "
+				       "(physical %d) to enter OPAL\n",
+				       i, paca_ptrs[i]->hw_cpu_id);
+				notified = i;
+			}
+
+			/*
+			 * On crash secondaries might be unreachable or hung,
+			 * so timeout if we've waited too long
+			 * */
+			mdelay(1);
+			if (timeout-- == 0) {
+				printk(KERN_ERR "kexec: timed out waiting for "
+				       "cpu %d (physical %d) to enter OPAL\n",
+				       i, paca_ptrs[i]->hw_cpu_id);
+				break;
+			}
+		}
+	}
+}
+
+static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
+{
+	u64 reinit_flags;
+
+	if (xive_enabled())
+		xive_teardown_cpu();
+	else
+		xics_kexec_teardown_cpu(secondary);
+
+	/* On OPAL, we return all CPUs to firmware */
+	if (!firmware_has_feature(FW_FEATURE_OPAL))
+		return;
+
+	if (secondary) {
+		/* Return secondary CPUs to firmware on OPAL v3 */
+		mb();
+		get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
+		mb();
+
+		/* Return the CPU to OPAL */
+		opal_return_cpu();
+	} else {
+		/* Primary waits for the secondaries to have reached OPAL */
+		pnv_kexec_wait_secondaries_down();
+
+		/* Switch XIVE back to emulation mode */
+		if (xive_enabled())
+			xive_shutdown();
+
+		/*
+		 * We might be running as little-endian - now that interrupts
+		 * are disabled, reset the HILE bit to big-endian so we don't
+		 * take interrupts in the wrong endian later
+		 *
+		 * We reinit to enable both radix and hash on P9 to ensure
+		 * the mode used by the next kernel is always supported.
+		 */
+		reinit_flags = OPAL_REINIT_CPUS_HILE_BE;
+		if (cpu_has_feature(CPU_FTR_ARCH_300))
+			reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX |
+				OPAL_REINIT_CPUS_MMU_HASH;
+		opal_reinit_cpus(reinit_flags);
+	}
+}
+#endif /* CONFIG_KEXEC_CORE */
+
+#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
+static unsigned long pnv_memory_block_size(void)
+{
+	return 256UL * 1024 * 1024;
+}
+#endif
+
+static void __init pnv_setup_machdep_opal(void)
+{
+	ppc_md.get_boot_time = opal_get_boot_time;
+	ppc_md.restart = pnv_restart;
+	pm_power_off = pnv_power_off;
+	ppc_md.halt = pnv_halt;
+	/* ppc_md.system_reset_exception gets filled in by pnv_smp_init() */
+	ppc_md.machine_check_exception = opal_machine_check;
+	ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery;
+	ppc_md.hmi_exception_early = opal_hmi_exception_early;
+	ppc_md.handle_hmi_exception = opal_handle_hmi_exception;
+}
+
+static int __init pnv_probe(void)
+{
+	if (!of_machine_is_compatible("ibm,powernv"))
+		return 0;
+
+	if (firmware_has_feature(FW_FEATURE_OPAL))
+		pnv_setup_machdep_opal();
+
+	pr_debug("PowerNV detected !\n");
+
+	pnv_init();
+
+	return 1;
+}
+
+#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
+void __init pnv_tm_init(void)
+{
+	if (!firmware_has_feature(FW_FEATURE_OPAL) ||
+	    !pvr_version_is(PVR_POWER9) ||
+	    early_cpu_has_feature(CPU_FTR_TM))
+		return;
+
+	if (opal_reinit_cpus(OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED) != OPAL_SUCCESS)
+		return;
+
+	pr_info("Enabling TM (Transactional Memory) with Suspend Disabled\n");
+	cur_cpu_spec->cpu_features |= CPU_FTR_TM;
+	/* Make sure "normal" HTM is off (it should be) */
+	cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_HTM;
+	/* Turn on no suspend mode, and HTM no SC */
+	cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NO_SUSPEND | \
+					    PPC_FEATURE2_HTM_NOSC;
+	tm_suspend_disabled = true;
+}
+#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
+
+/*
+ * Returns the cpu frequency for 'cpu' in Hz. This is used by
+ * /proc/cpuinfo
+ */
+static unsigned long pnv_get_proc_freq(unsigned int cpu)
+{
+	unsigned long ret_freq;
+
+	ret_freq = cpufreq_get(cpu) * 1000ul;
+
+	/*
+	 * If the backend cpufreq driver does not exist,
+         * then fallback to old way of reporting the clockrate.
+	 */
+	if (!ret_freq)
+		ret_freq = ppc_proc_freq;
+	return ret_freq;
+}
+
+define_machine(powernv) {
+	.name			= "PowerNV",
+	.probe			= pnv_probe,
+	.setup_arch		= pnv_setup_arch,
+	.init_IRQ		= pnv_init_IRQ,
+	.show_cpuinfo		= pnv_show_cpuinfo,
+	.get_proc_freq          = pnv_get_proc_freq,
+	.progress		= pnv_progress,
+	.machine_shutdown	= pnv_shutdown,
+	.power_save             = NULL,
+	.calibrate_decr		= generic_calibrate_decr,
+#ifdef CONFIG_KEXEC_CORE
+	.kexec_cpu_down		= pnv_kexec_cpu_down,
+#endif
+#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
+	.memory_block_size	= pnv_memory_block_size,
+#endif
+};