1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * ICS backend for OPAL managed interrupts.
5 * Copyright 2011 IBM Corp.
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/irq.h>
13 #include <linux/smp.h>
14 #include <linux/interrupt.h>
15 #include <linux/init.h>
16 #include <linux/cpu.h>
18 #include <linux/spinlock.h>
19 #include <linux/msi.h>
22 #include <asm/machdep.h>
24 #include <asm/errno.h>
27 #include <asm/firmware.h>
29 static int ics_opal_mangle_server(int server)
35 static int ics_opal_unmangle_server(int server)
41 static void ics_opal_unmask_irq(struct irq_data *d)
43 unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
47 pr_devel("ics-hal: unmask virq %d [hw 0x%x]\n", d->irq, hw_irq);
49 if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS)
52 server = xics_get_irq_server(d->irq, irq_data_get_affinity_mask(d), 0);
53 server = ics_opal_mangle_server(server);
55 rc = opal_set_xive(hw_irq, server, DEFAULT_PRIORITY);
56 if (rc != OPAL_SUCCESS)
57 pr_err("%s: opal_set_xive(irq=%d [hw 0x%x] server=%x)"
59 __func__, d->irq, hw_irq, server, rc);
62 static unsigned int ics_opal_startup(struct irq_data *d)
64 ics_opal_unmask_irq(d);
68 static void ics_opal_mask_real_irq(unsigned int hw_irq)
70 int server = ics_opal_mangle_server(xics_default_server);
73 if (hw_irq == XICS_IPI)
76 /* Have to set XIVE to 0xff to be able to remove a slot */
77 rc = opal_set_xive(hw_irq, server, 0xff);
78 if (rc != OPAL_SUCCESS)
79 pr_err("%s: opal_set_xive(0xff) irq=%u returned %lld\n",
80 __func__, hw_irq, rc);
83 static void ics_opal_mask_irq(struct irq_data *d)
85 unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
87 pr_devel("ics-hal: mask virq %d [hw 0x%x]\n", d->irq, hw_irq);
89 if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS)
91 ics_opal_mask_real_irq(hw_irq);
94 static int ics_opal_set_affinity(struct irq_data *d,
95 const struct cpumask *cpumask,
98 unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
105 if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS)
108 rc = opal_get_xive(hw_irq, &oserver, &priority);
109 if (rc != OPAL_SUCCESS) {
110 pr_err("%s: opal_get_xive(irq=%d [hw 0x%x]) error %lld\n",
111 __func__, d->irq, hw_irq, rc);
114 server = be16_to_cpu(oserver);
116 wanted_server = xics_get_irq_server(d->irq, cpumask, 1);
117 if (wanted_server < 0) {
118 pr_warn("%s: No online cpus in the mask %*pb for irq %d\n",
119 __func__, cpumask_pr_args(cpumask), d->irq);
122 server = ics_opal_mangle_server(wanted_server);
124 pr_debug("ics-hal: set-affinity irq %d [hw 0x%x] server: 0x%x/0x%x\n",
125 d->irq, hw_irq, wanted_server, server);
127 rc = opal_set_xive(hw_irq, server, priority);
128 if (rc != OPAL_SUCCESS) {
129 pr_err("%s: opal_set_xive(irq=%d [hw 0x%x] server=%x)"
131 __func__, d->irq, hw_irq, server, rc);
134 return IRQ_SET_MASK_OK;
137 static struct irq_chip ics_opal_irq_chip = {
139 .irq_startup = ics_opal_startup,
140 .irq_mask = ics_opal_mask_irq,
141 .irq_unmask = ics_opal_unmask_irq,
142 .irq_eoi = NULL, /* Patched at init time */
143 .irq_set_affinity = ics_opal_set_affinity,
144 .irq_set_type = xics_set_irq_type,
145 .irq_retrigger = xics_retrigger,
148 static int ics_opal_host_match(struct ics *ics, struct device_node *node)
153 static int ics_opal_check(struct ics *ics, unsigned int hw_irq)
159 if (WARN_ON(hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS))
162 /* Check if HAL knows about this interrupt */
163 rc = opal_get_xive(hw_irq, &server, &priority);
164 if (rc != OPAL_SUCCESS)
170 static void ics_opal_mask_unknown(struct ics *ics, unsigned long vec)
176 /* Check if HAL knows about this interrupt */
177 rc = opal_get_xive(vec, &server, &priority);
178 if (rc != OPAL_SUCCESS)
181 ics_opal_mask_real_irq(vec);
184 static long ics_opal_get_server(struct ics *ics, unsigned long vec)
190 /* Check if HAL knows about this interrupt */
191 rc = opal_get_xive(vec, &server, &priority);
192 if (rc != OPAL_SUCCESS)
194 return ics_opal_unmangle_server(be16_to_cpu(server));
197 /* Only one global & state struct ics */
198 static struct ics ics_hal = {
199 .check = ics_opal_check,
200 .mask_unknown = ics_opal_mask_unknown,
201 .get_server = ics_opal_get_server,
202 .host_match = ics_opal_host_match,
203 .chip = &ics_opal_irq_chip,
206 int __init ics_opal_init(void)
208 if (!firmware_has_feature(FW_FEATURE_OPAL))
211 /* We need to patch our irq chip's EOI to point to the
214 ics_opal_irq_chip.irq_eoi = icp_ops->eoi;
216 /* Register ourselves */
217 xics_register_ics(&ics_hal);
219 pr_info("ICS OPAL backend registered\n");