xref: /openbmc/qemu/hw/pci-host/pnv_phb3_msi.c (revision afb81fe8) 
1 /*
2  * QEMU PowerPC PowerNV (POWER8) PHB3 model
3  *
4  * Copyright (c) 2014-2020, IBM Corporation.
5  *
6  * This code is licensed under the GPL version 2 or later. See the
7  * COPYING file in the top-level directory.
8  */
9 #include "qemu/osdep.h"
10 #include "qemu/log.h"
11 #include "qapi/error.h"
12 #include "hw/pci-host/pnv_phb3_regs.h"
13 #include "hw/pci-host/pnv_phb3.h"
14 #include "hw/ppc/pnv.h"
15 #include "hw/pci/msi.h"
16 #include "monitor/monitor.h"
17 #include "hw/irq.h"
18 #include "hw/qdev-properties.h"
19 #include "sysemu/reset.h"
20 
21 static uint64_t phb3_msi_ive_addr(PnvPHB3 *phb, int srcno)
22 {
23     uint64_t ivtbar = phb->regs[PHB_IVT_BAR >> 3];
24     uint64_t phbctl = phb->regs[PHB_CONTROL >> 3];
25 
26     if (!(ivtbar & PHB_IVT_BAR_ENABLE)) {
27         qemu_log_mask(LOG_GUEST_ERROR, "Failed access to disable IVT BAR !");
28         return 0;
29     }
30 
31     if (srcno >= (ivtbar & PHB_IVT_LENGTH_MASK)) {
32         qemu_log_mask(LOG_GUEST_ERROR, "MSI out of bounds (%d vs  0x%"PRIx64")",
33                       srcno, (uint64_t) (ivtbar & PHB_IVT_LENGTH_MASK));
34         return 0;
35     }
36 
37     ivtbar &= PHB_IVT_BASE_ADDRESS_MASK;
38 
39     if (phbctl & PHB_CTRL_IVE_128_BYTES) {
40         return ivtbar + 128 * srcno;
41     } else {
42         return ivtbar + 16 * srcno;
43     }
44 }
45 
46 static bool phb3_msi_read_ive(PnvPHB3 *phb, int srcno, uint64_t *out_ive)
47 {
48     uint64_t ive_addr, ive;
49 
50     ive_addr = phb3_msi_ive_addr(phb, srcno);
51     if (!ive_addr) {
52         return false;
53     }
54 
55     if (dma_memory_read(&address_space_memory, ive_addr,
56                         &ive, sizeof(ive), MEMTXATTRS_UNSPECIFIED)) {
57         qemu_log_mask(LOG_GUEST_ERROR, "Failed to read IVE at 0x%" PRIx64,
58                       ive_addr);
59         return false;
60     }
61     *out_ive = be64_to_cpu(ive);
62 
63     return true;
64 }
65 
66 static void phb3_msi_set_p(Phb3MsiState *msi, int srcno, uint8_t gen)
67 {
68     uint64_t ive_addr;
69     uint8_t p = 0x01 | (gen << 1);
70 
71     ive_addr = phb3_msi_ive_addr(msi->phb, srcno);
72     if (!ive_addr) {
73         return;
74     }
75 
76     if (dma_memory_write(&address_space_memory, ive_addr + 4,
77                          &p, 1, MEMTXATTRS_UNSPECIFIED)) {
78         qemu_log_mask(LOG_GUEST_ERROR,
79                       "Failed to write IVE (set P) at 0x%" PRIx64, ive_addr);
80     }
81 }
82 
83 static void phb3_msi_set_q(Phb3MsiState *msi, int srcno)
84 {
85     uint64_t ive_addr;
86     uint8_t q = 0x01;
87 
88     ive_addr = phb3_msi_ive_addr(msi->phb, srcno);
89     if (!ive_addr) {
90         return;
91     }
92 
93     if (dma_memory_write(&address_space_memory, ive_addr + 5,
94                          &q, 1, MEMTXATTRS_UNSPECIFIED)) {
95         qemu_log_mask(LOG_GUEST_ERROR,
96                       "Failed to write IVE (set Q) at 0x%" PRIx64, ive_addr);
97     }
98 }
99 
100 static void phb3_msi_try_send(Phb3MsiState *msi, int srcno, bool force)
101 {
102     ICSState *ics = ICS(msi);
103     uint64_t ive;
104     uint64_t server, prio, pq, gen;
105 
106     if (!phb3_msi_read_ive(msi->phb, srcno, &ive)) {
107         return;
108     }
109 
110     server = GETFIELD(IODA2_IVT_SERVER, ive);
111     prio = GETFIELD(IODA2_IVT_PRIORITY, ive);
112     if (!force) {
113         pq = GETFIELD(IODA2_IVT_Q, ive) | (GETFIELD(IODA2_IVT_P, ive) << 1);
114     } else {
115         pq = 0;
116     }
117     gen = GETFIELD(IODA2_IVT_GEN, ive);
118 
119     /*
120      * The low order 2 bits are the link pointer (Type II interrupts).
121      * Shift back to get a valid IRQ server.
122      */
123     server >>= 2;
124 
125     switch (pq) {
126     case 0: /* 00 */
127         if (prio == 0xff) {
128             /* Masked, set Q */
129             phb3_msi_set_q(msi, srcno);
130         } else {
131             /* Enabled, set P and send */
132             phb3_msi_set_p(msi, srcno, gen);
133             icp_irq(ics, server, srcno + ics->offset, prio);
134         }
135         break;
136     case 2: /* 10 */
137         /* Already pending, set Q */
138         phb3_msi_set_q(msi, srcno);
139         break;
140     case 1: /* 01 */
141     case 3: /* 11 */
142     default:
143         /* Just drop stuff if Q already set */
144         break;
145     }
146 }
147 
148 static void phb3_msi_set_irq(void *opaque, int srcno, int val)
149 {
150     Phb3MsiState *msi = PHB3_MSI(opaque);
151 
152     if (val) {
153         phb3_msi_try_send(msi, srcno, false);
154     }
155 }
156 
157 
158 void pnv_phb3_msi_send(Phb3MsiState *msi, uint64_t addr, uint16_t data,
159                        int32_t dev_pe)
160 {
161     ICSState *ics = ICS(msi);
162     uint64_t ive;
163     uint16_t pe;
164     uint32_t src = ((addr >> 4) & 0xffff) | (data & 0x1f);
165 
166     if (src >= ics->nr_irqs) {
167         qemu_log_mask(LOG_GUEST_ERROR, "MSI %d out of bounds", src);
168         return;
169     }
170     if (dev_pe >= 0) {
171         if (!phb3_msi_read_ive(msi->phb, src, &ive)) {
172             return;
173         }
174         pe = GETFIELD(IODA2_IVT_PE, ive);
175         if (pe != dev_pe) {
176             qemu_log_mask(LOG_GUEST_ERROR,
177                           "MSI %d send by PE#%d but assigned to PE#%d",
178                           src, dev_pe, pe);
179             return;
180         }
181     }
182     qemu_irq_pulse(msi->qirqs[src]);
183 }
184 
185 void pnv_phb3_msi_ffi(Phb3MsiState *msi, uint64_t val)
186 {
187     /* Emit interrupt */
188     pnv_phb3_msi_send(msi, val, 0, -1);
189 
190     /* Clear FFI lock */
191     msi->phb->regs[PHB_FFI_LOCK >> 3] = 0;
192 }
193 
194 static void phb3_msi_reject(ICSState *ics, uint32_t nr)
195 {
196     Phb3MsiState *msi = PHB3_MSI(ics);
197     unsigned int srcno = nr - ics->offset;
198     unsigned int idx = srcno >> 6;
199     unsigned int bit = 1ull << (srcno & 0x3f);
200 
201     assert(srcno < PHB3_MAX_MSI);
202 
203     msi->rba[idx] |= bit;
204     msi->rba_sum |= (1u << idx);
205 }
206 
207 static void phb3_msi_resend(ICSState *ics)
208 {
209     Phb3MsiState *msi = PHB3_MSI(ics);
210     unsigned int i, j;
211 
212     if (msi->rba_sum == 0) {
213         return;
214     }
215 
216     for (i = 0; i < 32; i++) {
217         if ((msi->rba_sum & (1u << i)) == 0) {
218             continue;
219         }
220         msi->rba_sum &= ~(1u << i);
221         for (j = 0; j < 64; j++) {
222             if ((msi->rba[i] & (1ull << j)) == 0) {
223                 continue;
224             }
225             msi->rba[i] &= ~(1ull << j);
226             phb3_msi_try_send(msi, i * 64 + j, true);
227         }
228     }
229 }
230 
231 static void phb3_msi_reset_hold(Object *obj)
232 {
233     Phb3MsiState *msi = PHB3_MSI(obj);
234     ICSStateClass *icsc = ICS_GET_CLASS(obj);
235 
236     if (icsc->parent_phases.hold) {
237         icsc->parent_phases.hold(obj);
238     }
239 
240     memset(msi->rba, 0, sizeof(msi->rba));
241     msi->rba_sum = 0;
242 }
243 
244 void pnv_phb3_msi_update_config(Phb3MsiState *msi, uint32_t base,
245                                 uint32_t count)
246 {
247     ICSState *ics = ICS(msi);
248 
249     if (count > PHB3_MAX_MSI) {
250         count = PHB3_MAX_MSI;
251     }
252     ics->nr_irqs = count;
253     ics->offset = base;
254 }
255 
256 static void phb3_msi_realize(DeviceState *dev, Error **errp)
257 {
258     Phb3MsiState *msi = PHB3_MSI(dev);
259     ICSState *ics = ICS(msi);
260     ICSStateClass *icsc = ICS_GET_CLASS(ics);
261     Error *local_err = NULL;
262 
263     assert(msi->phb);
264 
265     icsc->parent_realize(dev, &local_err);
266     if (local_err) {
267         error_propagate(errp, local_err);
268         return;
269     }
270 
271     msi->qirqs = qemu_allocate_irqs(phb3_msi_set_irq, msi, ics->nr_irqs);
272 }
273 
274 static void phb3_msi_instance_init(Object *obj)
275 {
276     Phb3MsiState *msi = PHB3_MSI(obj);
277     ICSState *ics = ICS(obj);
278 
279     object_property_add_link(obj, "phb", TYPE_PNV_PHB3,
280                              (Object **)&msi->phb,
281                              object_property_allow_set_link,
282                              OBJ_PROP_LINK_STRONG);
283 
284     /* Will be overridden later */
285     ics->offset = 0;
286 }
287 
288 static void phb3_msi_class_init(ObjectClass *klass, void *data)
289 {
290     DeviceClass *dc = DEVICE_CLASS(klass);
291     ICSStateClass *isc = ICS_CLASS(klass);
292     ResettableClass *rc = RESETTABLE_CLASS(klass);
293 
294     device_class_set_parent_realize(dc, phb3_msi_realize,
295                                     &isc->parent_realize);
296     resettable_class_set_parent_phases(rc, NULL, phb3_msi_reset_hold, NULL,
297                                        &isc->parent_phases);
298 
299     isc->reject = phb3_msi_reject;
300     isc->resend = phb3_msi_resend;
301 }
302 
303 static const TypeInfo phb3_msi_info = {
304     .name = TYPE_PHB3_MSI,
305     .parent = TYPE_ICS,
306     .instance_size = sizeof(Phb3MsiState),
307     .class_init = phb3_msi_class_init,
308     .class_size = sizeof(ICSStateClass),
309     .instance_init = phb3_msi_instance_init,
310 };
311 
312 static void pnv_phb3_msi_register_types(void)
313 {
314     type_register_static(&phb3_msi_info);
315 }
316 
317 type_init(pnv_phb3_msi_register_types);
318 
319 void pnv_phb3_msi_pic_print_info(Phb3MsiState *msi, Monitor *mon)
320 {
321     ICSState *ics = ICS(msi);
322     int i;
323 
324     monitor_printf(mon, "ICS %4x..%4x %p\n",
325                    ics->offset, ics->offset + ics->nr_irqs - 1, ics);
326 
327     for (i = 0; i < ics->nr_irqs; i++) {
328         uint64_t ive;
329 
330         if (!phb3_msi_read_ive(msi->phb, i, &ive)) {
331             return;
332         }
333 
334         if (GETFIELD(IODA2_IVT_PRIORITY, ive) == 0xff) {
335             continue;
336         }
337 
338         monitor_printf(mon, "  %4x %c%c server=%04x prio=%02x gen=%d\n",
339                        ics->offset + i,
340                        GETFIELD(IODA2_IVT_P, ive) ? 'P' : '-',
341                        GETFIELD(IODA2_IVT_Q, ive) ? 'Q' : '-',
342                        (uint32_t) GETFIELD(IODA2_IVT_SERVER, ive) >> 2,
343                        (uint32_t) GETFIELD(IODA2_IVT_PRIORITY, ive),
344                        (uint32_t) GETFIELD(IODA2_IVT_GEN, ive));
345     }
346 }
347