path: root/arch/powerpc/platforms/pseries/lpar.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * pSeries_lpar.c
 * Copyright (C) 2001 Todd Inglett, IBM Corporation
 *
 * pSeries LPAR support.
 */

/* Enables debugging of low-level hash table routines - careful! */
#undef DEBUG
#define pr_fmt(fmt) "lpar: " fmt

#include <linux/kernel.h>
#include <linux/dma-mapping.h>
#include <linux/console.h>
#include <linux/export.h>
#include <linux/jump_label.h>
#include <linux/delay.h>
#include <linux/stop_machine.h>
#include <asm/processor.h>
#include <asm/mmu.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/machdep.h>
#include <asm/mmu_context.h>
#include <asm/iommu.h>
#include <asm/tlb.h>
#include <asm/prom.h>
#include <asm/cputable.h>
#include <asm/udbg.h>
#include <asm/smp.h>
#include <asm/trace.h>
#include <asm/firmware.h>
#include <asm/plpar_wrappers.h>
#include <asm/kexec.h>
#include <asm/fadump.h>
#include <asm/asm-prototypes.h>
#include <asm/debugfs.h>

#include "pseries.h"

/* Flag bits for H_BULK_REMOVE */
#define HBR_REQUEST	0x4000000000000000UL
#define HBR_RESPONSE	0x8000000000000000UL
#define HBR_END		0xc000000000000000UL
#define HBR_AVPN	0x0200000000000000UL
#define HBR_ANDCOND	0x0100000000000000UL


/* in hvCall.S */
EXPORT_SYMBOL(plpar_hcall);
EXPORT_SYMBOL(plpar_hcall9);
EXPORT_SYMBOL(plpar_hcall_norets);

void vpa_init(int cpu)
{
	int hwcpu = get_hard_smp_processor_id(cpu);
	unsigned long addr;
	long ret;
	struct paca_struct *pp;
	struct dtl_entry *dtl;

	/*
	 * The spec says it "may be problematic" if CPU x registers the VPA of
	 * CPU y. We should never do that, but wail if we ever do.
	 */
	WARN_ON(cpu != smp_processor_id());

	if (cpu_has_feature(CPU_FTR_ALTIVEC))
		lppaca_of(cpu).vmxregs_in_use = 1;

	if (cpu_has_feature(CPU_FTR_ARCH_207S))
		lppaca_of(cpu).ebb_regs_in_use = 1;

	addr = __pa(&lppaca_of(cpu));
	ret = register_vpa(hwcpu, addr);

	if (ret) {
		pr_err("WARNING: VPA registration for cpu %d (hw %d) of area "
		       "%lx failed with %ld\n", cpu, hwcpu, addr, ret);
		return;
	}

#ifdef CONFIG_PPC_BOOK3S_64
	/*
	 * PAPR says this feature is SLB-Buffer but firmware never
	 * reports that.  All SPLPAR support SLB shadow buffer.
	 */
	if (!radix_enabled() && firmware_has_feature(FW_FEATURE_SPLPAR)) {
		addr = __pa(paca_ptrs[cpu]->slb_shadow_ptr);
		ret = register_slb_shadow(hwcpu, addr);
		if (ret)
			pr_err("WARNING: SLB shadow buffer registration for "
			       "cpu %d (hw %d) of area %lx failed with %ld\n",
			       cpu, hwcpu, addr, ret);
	}
#endif /* CONFIG_PPC_BOOK3S_64 */

	/*
	 * Register dispatch trace log, if one has been allocated.
	 */
	pp = paca_ptrs[cpu];
	dtl = pp->dispatch_log;
	if (dtl) {
		pp->dtl_ridx = 0;
		pp->dtl_curr = dtl;
		lppaca_of(cpu).dtl_idx = 0;

		/* hypervisor reads buffer length from this field */
		dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
		ret = register_dtl(hwcpu, __pa(dtl));
		if (ret)
			pr_err("WARNING: DTL registration of cpu %d (hw %d) "
			       "failed with %ld