2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
8 * Copyright (C) 2008 Silicon Graphics, Inc. All rights reserved.
11 #include <linux/module.h>
12 #include <linux/rbtree.h>
13 #include <linux/slab.h>
14 #include <linux/irq.h>
17 #include <asm/uv/uv_irq.h>
18 #include <asm/uv/uv_hub.h>
20 /* MMR offset and pnode of hub sourcing interrupts for a given irq */
21 struct uv_irq_2_mmr_pnode{
28 static spinlock_t uv_irq_lock;
29 static struct rb_root uv_irq_root;
31 static int uv_set_irq_affinity(struct irq_data *, const struct cpumask *, bool);
33 static void uv_noop(struct irq_data *data) { }
35 static void uv_ack_apic(struct irq_data *data)
40 static struct irq_chip uv_irq_chip = {
43 .irq_unmask = uv_noop,
44 .irq_eoi = uv_ack_apic,
45 .irq_set_affinity = uv_set_irq_affinity,
49 * Add offset and pnode information of the hub sourcing interrupts to the
50 * rb tree for a specific irq.
52 static int uv_set_irq_2_mmr_info(int irq, unsigned long offset, unsigned blade)
54 struct rb_node **link = &uv_irq_root.rb_node;
55 struct rb_node *parent = NULL;
56 struct uv_irq_2_mmr_pnode *n;
57 struct uv_irq_2_mmr_pnode *e;
58 unsigned long irqflags;
60 n = kmalloc_node(sizeof(struct uv_irq_2_mmr_pnode), GFP_KERNEL,
61 uv_blade_to_memory_nid(blade));
67 n->pnode = uv_blade_to_pnode(blade);
68 spin_lock_irqsave(&uv_irq_lock, irqflags);
69 /* Find the right place in the rbtree: */
72 e = rb_entry(parent, struct uv_irq_2_mmr_pnode, list);
74 if (unlikely(irq == e->irq)) {
75 /* irq entry exists */
76 e->pnode = uv_blade_to_pnode(blade);
78 spin_unlock_irqrestore(&uv_irq_lock, irqflags);
84 link = &(*link)->rb_left;
86 link = &(*link)->rb_right;
89 /* Insert the node into the rbtree. */
90 rb_link_node(&n->list, parent, link);
91 rb_insert_color(&n->list, &uv_irq_root);
93 spin_unlock_irqrestore(&uv_irq_lock, irqflags);
97 /* Retrieve offset and pnode information from the rb tree for a specific irq */
98 int uv_irq_2_mmr_info(int irq, unsigned long *offset, int *pnode)
100 struct uv_irq_2_mmr_pnode *e;
102 unsigned long irqflags;
104 spin_lock_irqsave(&uv_irq_lock, irqflags);
105 n = uv_irq_root.rb_node;
107 e = rb_entry(n, struct uv_irq_2_mmr_pnode, list);
112 spin_unlock_irqrestore(&uv_irq_lock, irqflags);
121 spin_unlock_irqrestore(&uv_irq_lock, irqflags);
126 * Re-target the irq to the specified CPU and enable the specified MMR located
127 * on the specified blade to allow the sending of MSIs to the specified CPU.
130 arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade,
131 unsigned long mmr_offset, int limit)
133 const struct cpumask *eligible_cpu = cpumask_of(cpu);
134 struct irq_cfg *cfg = get_irq_chip_data(irq);
135 unsigned long mmr_value;
136 struct uv_IO_APIC_route_entry *entry;
139 BUILD_BUG_ON(sizeof(struct uv_IO_APIC_route_entry) !=
140 sizeof(unsigned long));
142 err = assign_irq_vector(irq, cfg, eligible_cpu);
146 if (limit == UV_AFFINITY_CPU)
147 irq_set_status_flags(irq, IRQ_NO_BALANCING);
149 irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
151 set_irq_chip_and_handler_name(irq, &uv_irq_chip, handle_percpu_irq,
155 entry = (struct uv_IO_APIC_route_entry *)&mmr_value;
156 entry->vector = cfg->vector;
157 entry->delivery_mode = apic->irq_delivery_mode;
158 entry->dest_mode = apic->irq_dest_mode;
162 entry->dest = apic->cpu_mask_to_apicid(eligible_cpu);
164 mmr_pnode = uv_blade_to_pnode(mmr_blade);
165 uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value);
167 if (cfg->move_in_progress)
168 send_cleanup_vector(cfg);
174 * Disable the specified MMR located on the specified blade so that MSIs are
175 * longer allowed to be sent.
177 static void arch_disable_uv_irq(int mmr_pnode, unsigned long mmr_offset)
179 unsigned long mmr_value;
180 struct uv_IO_APIC_route_entry *entry;
182 BUILD_BUG_ON(sizeof(struct uv_IO_APIC_route_entry) !=
183 sizeof(unsigned long));
186 entry = (struct uv_IO_APIC_route_entry *)&mmr_value;
189 uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value);
193 uv_set_irq_affinity(struct irq_data *data, const struct cpumask *mask,
196 struct irq_cfg *cfg = data->chip_data;
198 unsigned long mmr_value, mmr_offset;
199 struct uv_IO_APIC_route_entry *entry;
202 if (__ioapic_set_affinity(data, mask, &dest))
206 entry = (struct uv_IO_APIC_route_entry *)&mmr_value;
208 entry->vector = cfg->vector;
209 entry->delivery_mode = apic->irq_delivery_mode;
210 entry->dest_mode = apic->irq_dest_mode;
216 /* Get previously stored MMR and pnode of hub sourcing interrupts */
217 if (uv_irq_2_mmr_info(data->irq, &mmr_offset, &mmr_pnode))
220 uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value);
222 if (cfg->move_in_progress)
223 send_cleanup_vector(cfg);
229 * Set up a mapping of an available irq and vector, and enable the specified
230 * MMR that defines the MSI that is to be sent to the specified CPU when an
231 * interrupt is raised.
233 int uv_setup_irq(char *irq_name, int cpu, int mmr_blade,
234 unsigned long mmr_offset, int limit)
238 irq = create_irq_nr(NR_IRQS_LEGACY, uv_blade_to_memory_nid(mmr_blade));
243 ret = arch_enable_uv_irq(irq_name, irq, cpu, mmr_blade, mmr_offset,
246 uv_set_irq_2_mmr_info(irq, mmr_offset, mmr_blade);
252 EXPORT_SYMBOL_GPL(uv_setup_irq);
255 * Tear down a mapping of an irq and vector, and disable the specified MMR that
256 * defined the MSI that was to be sent to the specified CPU when an interrupt
259 * Set mmr_blade and mmr_offset to what was passed in on uv_setup_irq().
261 void uv_teardown_irq(unsigned int irq)
263 struct uv_irq_2_mmr_pnode *e;
265 unsigned long irqflags;
267 spin_lock_irqsave(&uv_irq_lock, irqflags);
268 n = uv_irq_root.rb_node;
270 e = rb_entry(n, struct uv_irq_2_mmr_pnode, list);
272 arch_disable_uv_irq(e->pnode, e->offset);
273 rb_erase(n, &uv_irq_root);
282 spin_unlock_irqrestore(&uv_irq_lock, irqflags);
285 EXPORT_SYMBOL_GPL(uv_teardown_irq);