2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2014 Hudson River Trading LLC
5 * Written by: John H. Baldwin <jhb@FreeBSD.org>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 #include <sys/param.h>
33 #include <machine/vmm.h>
49 * Implement an 8 pin PCI interrupt router compatible with the router
50 * present on Intel's ICH10 chip.
53 /* Fields in each PIRQ register. */
57 /* Only IRQs 3-7, 9-12, and 14-15 are permitted. */
58 #define PERMITTED_IRQS 0xdef8
59 #define IRQ_PERMITTED(irq) (((1U << (irq)) & PERMITTED_IRQS) != 0)
61 /* IRQ count to disable an IRQ. */
62 #define IRQ_DISABLED 0xff
72 #define NIRQ_COUNTS 16
73 static u_char irq_counts[NIRQ_COUNTS];
74 static int pirq_cold = 1;
77 * Returns true if this pin is enabled with a valid IRQ. Setting the
78 * register to a reserved IRQ causes interrupts to not be asserted as
79 * if the pin was disabled.
82 pirq_valid_irq(int reg)
87 return (IRQ_PERMITTED(reg & PIRQ_IRQ));
94 assert(pin > 0 && pin <= NPIRQS);
95 return (pirqs[pin - 1].reg);
99 pirq_write(struct vmctx *ctx, int pin, uint8_t val)
103 assert(pin > 0 && pin <= NPIRQS);
104 pirq = &pirqs[pin - 1];
105 pthread_mutex_lock(&pirq->lock);
106 if (pirq->reg != (val & (PIRQ_DIS | PIRQ_IRQ))) {
107 if (pirq->active_count != 0 && pirq_valid_irq(pirq->reg))
108 vm_isa_deassert_irq(ctx, pirq->reg & PIRQ_IRQ, -1);
109 pirq->reg = val & (PIRQ_DIS | PIRQ_IRQ);
110 if (pirq->active_count != 0 && pirq_valid_irq(pirq->reg))
111 vm_isa_assert_irq(ctx, pirq->reg & PIRQ_IRQ, -1);
113 pthread_mutex_unlock(&pirq->lock);
117 pci_irq_reserve(int irq)
120 assert(irq >= 0 && irq < NIRQ_COUNTS);
122 assert(irq_counts[irq] == 0 || irq_counts[irq] == IRQ_DISABLED);
123 irq_counts[irq] = IRQ_DISABLED;
130 assert(irq >= 0 && irq < NIRQ_COUNTS);
132 assert(irq_counts[irq] != IRQ_DISABLED);
137 pci_irq_init(struct vmctx *ctx __unused)
141 for (i = 0; i < NPIRQS; i++) {
142 pirqs[i].reg = PIRQ_DIS;
143 pirqs[i].use_count = 0;
144 pirqs[i].active_count = 0;
145 pthread_mutex_init(&pirqs[i].lock, NULL);
147 for (i = 0; i < NIRQ_COUNTS; i++) {
148 if (IRQ_PERMITTED(i))
151 irq_counts[i] = IRQ_DISABLED;
156 pci_irq_assert(struct pci_devinst *pi)
161 pin = pi->pi_lintr.pirq_pin;
163 assert(pin <= NPIRQS);
164 pirq = &pirqs[pin - 1];
165 pthread_mutex_lock(&pirq->lock);
166 pirq->active_count++;
167 if (pirq->active_count == 1 && pirq_valid_irq(pirq->reg)) {
168 vm_isa_assert_irq(pi->pi_vmctx, pirq->reg & PIRQ_IRQ,
169 pi->pi_lintr.ioapic_irq);
170 pthread_mutex_unlock(&pirq->lock);
173 pthread_mutex_unlock(&pirq->lock);
175 vm_ioapic_assert_irq(pi->pi_vmctx, pi->pi_lintr.ioapic_irq);
179 pci_irq_deassert(struct pci_devinst *pi)
184 pin = pi->pi_lintr.pirq_pin;
186 assert(pin <= NPIRQS);
187 pirq = &pirqs[pin - 1];
188 pthread_mutex_lock(&pirq->lock);
189 pirq->active_count--;
190 if (pirq->active_count == 0 && pirq_valid_irq(pirq->reg)) {
191 vm_isa_deassert_irq(pi->pi_vmctx, pirq->reg & PIRQ_IRQ,
192 pi->pi_lintr.ioapic_irq);
193 pthread_mutex_unlock(&pirq->lock);
196 pthread_mutex_unlock(&pirq->lock);
198 vm_ioapic_deassert_irq(pi->pi_vmctx, pi->pi_lintr.ioapic_irq);
202 pirq_alloc_pin(struct pci_devinst *pi)
204 struct vmctx *ctx = pi->pi_vmctx;
205 int best_count, best_irq, best_pin, irq, pin;
210 /* For external bootrom use fixed mapping. */
211 best_pin = (4 + pi->pi_slot + pi->pi_lintr.pin) % 8;
213 /* Find the least-used PIRQ pin. */
215 best_count = pirqs[0].use_count;
216 for (pin = 1; pin < NPIRQS; pin++) {
217 if (pirqs[pin].use_count < best_count) {
219 best_count = pirqs[pin].use_count;
223 pirqs[best_pin].use_count++;
225 /* Second, route this pin to an IRQ. */
226 if (pirqs[best_pin].reg == PIRQ_DIS) {
229 for (irq = 0; irq < NIRQ_COUNTS; irq++) {
230 if (irq_counts[irq] == IRQ_DISABLED)
232 if (best_irq == -1 || irq_counts[irq] < best_count) {
234 best_count = irq_counts[irq];
237 assert(best_irq >= 0);
238 irq_counts[best_irq]++;
239 pirqs[best_pin].reg = best_irq;
240 vm_isa_set_irq_trigger(ctx, best_irq, LEVEL_TRIGGER);
243 return (best_pin + 1);
249 assert(pin > 0 && pin <= NPIRQS);
250 return (pirqs[pin - 1].reg & PIRQ_IRQ);
253 /* XXX: Generate $PIR table. */
262 for (irq = 0; irq < NIRQ_COUNTS; irq++) {
263 if (!IRQ_PERMITTED(irq))
266 asprintf(&irq_prs, "%d", irq);
269 asprintf(&irq_prs, "%s,%d", old, irq);
275 * A helper method to validate a link register's value. This
276 * duplicates pirq_valid_irq().
279 dsdt_line("Method (PIRV, 1, NotSerialized)");
281 dsdt_line(" If (And (Arg0, 0x%02X))", PIRQ_DIS);
283 dsdt_line(" Return (0x00)");
285 dsdt_line(" And (Arg0, 0x%02X, Local0)", PIRQ_IRQ);
286 dsdt_line(" If (LLess (Local0, 0x03))");
288 dsdt_line(" Return (0x00)");
290 dsdt_line(" If (LEqual (Local0, 0x08))");
292 dsdt_line(" Return (0x00)");
294 dsdt_line(" If (LEqual (Local0, 0x0D))");
296 dsdt_line(" Return (0x00)");
298 dsdt_line(" Return (0x01)");
301 for (pin = 0; pin < NPIRQS; pin++) {
303 dsdt_line("Device (LNK%c)", 'A' + pin);
305 dsdt_line(" Name (_HID, EisaId (\"PNP0C0F\"))");
306 dsdt_line(" Name (_UID, 0x%02X)", pin + 1);
307 dsdt_line(" Method (_STA, 0, NotSerialized)");
309 dsdt_line(" If (PIRV (PIR%c))", 'A' + pin);
311 dsdt_line(" Return (0x0B)");
315 dsdt_line(" Return (0x09)");
318 dsdt_line(" Name (_PRS, ResourceTemplate ()");
320 dsdt_line(" IRQ (Level, ActiveLow, Shared, )");
321 dsdt_line(" {%s}", irq_prs);
323 dsdt_line(" Name (CB%02X, ResourceTemplate ()", pin + 1);
325 dsdt_line(" IRQ (Level, ActiveLow, Shared, )");
328 dsdt_line(" CreateWordField (CB%02X, 0x01, CIR%c)",
330 dsdt_line(" Method (_CRS, 0, NotSerialized)");
332 dsdt_line(" And (PIR%c, 0x%02X, Local0)", 'A' + pin,
333 PIRQ_DIS | PIRQ_IRQ);
334 dsdt_line(" If (PIRV (Local0))");
336 dsdt_line(" ShiftLeft (0x01, Local0, CIR%c)", 'A' + pin);
340 dsdt_line(" Store (0x00, CIR%c)", 'A' + pin);
342 dsdt_line(" Return (CB%02X)", pin + 1);
344 dsdt_line(" Method (_DIS, 0, NotSerialized)");
346 dsdt_line(" Store (0x80, PIR%c)", 'A' + pin);
348 dsdt_line(" Method (_SRS, 1, NotSerialized)");
350 dsdt_line(" CreateWordField (Arg0, 0x01, SIR%c)", 'A' + pin);
351 dsdt_line(" FindSetRightBit (SIR%c, Local0)", 'A' + pin);
352 dsdt_line(" Store (Decrement (Local0), PIR%c)", 'A' + pin);