arch/powerpc/sysdev/xics/ics-rtas.c

Source file repositories/reference/linux-study-clean/arch/powerpc/sysdev/xics/ics-rtas.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/sysdev/xics/ics-rtas.c
Extension
.c
Size
5538 bytes
Lines
226
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/cpu.h>
#include <linux/of.h>
#include <linux/spinlock.h>
#include <linux/msi.h>

#include <asm/smp.h>
#include <asm/machdep.h>
#include <asm/irq.h>
#include <asm/errno.h>
#include <asm/xics.h>
#include <asm/rtas.h>

/* RTAS service tokens */
static int ibm_get_xive;
static int ibm_set_xive;
static int ibm_int_on;
static int ibm_int_off;

static void ics_rtas_unmask_irq(struct irq_data *d)
{
	unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
	int call_status;
	int server;

	pr_devel("xics: unmask virq %d [hw 0x%x]\n", d->irq, hw_irq);

	if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS)
		return;

	server = xics_get_irq_server(d->irq, irq_data_get_affinity_mask(d), 0);

	call_status = rtas_call(ibm_set_xive, 3, 1, NULL, hw_irq, server,
				DEFAULT_PRIORITY);
	if (call_status != 0) {
		printk(KERN_ERR
			"%s: ibm_set_xive irq %u server %x returned %d\n",
			__func__, hw_irq, server, call_status);
		return;
	}

	/* Now unmask the interrupt (often a no-op) */
	call_status = rtas_call(ibm_int_on, 1, 1, NULL, hw_irq);
	if (call_status != 0) {
		printk(KERN_ERR "%s: ibm_int_on irq=%u returned %d\n",
			__func__, hw_irq, call_status);
		return;
	}
}

static unsigned int ics_rtas_startup(struct irq_data *d)
{
	/* unmask it */
	ics_rtas_unmask_irq(d);
	return 0;
}

static void ics_rtas_mask_real_irq(unsigned int hw_irq)
{
	int call_status;

	if (hw_irq == XICS_IPI)
		return;

	call_status = rtas_call(ibm_int_off, 1, 1, NULL, hw_irq);
	if (call_status != 0) {
		printk(KERN_ERR "%s: ibm_int_off irq=%u returned %d\n",
			__func__, hw_irq, call_status);
		return;
	}

	/* Have to set XIVE to 0xff to be able to remove a slot */
	call_status = rtas_call(ibm_set_xive, 3, 1, NULL, hw_irq,
				xics_default_server, 0xff);
	if (call_status != 0) {
		printk(KERN_ERR "%s: ibm_set_xive(0xff) irq=%u returned %d\n",
			__func__, hw_irq, call_status);
		return;
	}
}

static void ics_rtas_mask_irq(struct irq_data *d)
{
	unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);

Annotation

Implementation Notes