xref: /openbmc/qemu/hw/pci-host/pnv_phb3_msi.c (revision af531756) 
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 "qemu-common.h"
13 #include "hw/pci-host/pnv_phb3_regs.h"
14 #include "hw/pci-host/pnv_phb3.h"
15 #include "hw/ppc/pnv.h"
16 #include "hw/pci/msi.h"
17 #include "monitor/monitor.h"
18 #include "hw/irq.h"
19 #include "hw/qdev-properties.h"
20 #include "sysemu/reset.h"
21 
22 static uint64_t phb3_msi_ive_addr(PnvPHB3 *phb, int srcno)
23 {
24     uint64_t ivtbar = phb->regs[PHB_IVT_BAR >> 3];
25     uint64_t phbctl = phb->regs[PHB_CONTROL >> 3];
26 
27     if (!(ivtbar & PHB_IVT_BAR_ENABLE)) {
28         qemu_log_mask(LOG_GUEST_ERROR, "Failed access to disable IVT BAR !");
29         return 0;
30     }
31 
32     if (srcno >= (ivtbar & PHB_IVT_LENGTH_MASK)) {
33         qemu_log_mask(LOG_GUEST_ERROR, "MSI out of bounds (%d vs  0x%"PRIx64")",
34                       srcno, (uint64_t) (ivtbar & PHB_IVT_LENGTH_MASK));
35         return 0;
36     }
37 
38     ivtbar &= PHB_IVT_BASE_ADDRESS_MASK;
39 
40     if (phbctl & PHB_CTRL_IVE_128_BYTES) {
41         return ivtbar + 128 * srcno;
42     } else {
43         return ivtbar + 16 * srcno;
44     }
45 }
46 
47 static bool phb3_msi_read_ive(PnvPHB3 *phb, int srcno, uint64_t *out_ive)
48 {
49     uint64_t ive_addr, ive;
50 
51     ive_addr = phb3_msi_ive_addr(phb, srcno);
52     if (!ive_addr) {
53         return false;
54     }
55 
56     if (dma_memory_read(&address_space_memory, ive_addr, &ive, sizeof(ive))) {
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, &p, 1)) {
77         qemu_log_mask(LOG_GUEST_ERROR,
78                       "Failed to write IVE (set P) at 0x%" PRIx64, ive_addr);
79     }
80 }
81 
82 static void phb3_msi_set_q(Phb3MsiState *msi, int srcno)
83 {
84     uint64_t ive_addr;
85     uint8_t q = 0x01;
86 
87     ive_addr = phb3_msi_ive_addr(msi->phb, srcno);
88     if (!ive_addr) {
89         return;
90     }
91 
92     if (dma_memory_write(&address_space_memory, ive_addr + 5, &q, 1)) {
93         qemu_log_mask(LOG_GUEST_ERROR,
94                       "Failed to write IVE (set Q) at 0x%" PRIx64, ive_addr);
95     }
96 }
97 
98 static void phb3_msi_try_send(Phb3MsiState *msi, int srcno, bool force)
99 {
100     ICSState *ics = ICS(msi);
101     uint64_t ive;
102     uint64_t server, prio, pq, gen;
103 
104     if (!phb3_msi_read_ive(msi->phb, srcno, &ive)) {
105         return;
106     }
107 
108     server = GETFIELD(IODA2_IVT_SERVER, ive);
109     prio = GETFIELD(IODA2_IVT_PRIORITY, ive);
110     if (!force) {
111         pq = GETFIELD(IODA2_IVT_Q, ive) | (GETFIELD(IODA2_IVT_P, ive) << 1);
112     } else {
113         pq = 0;
114     }
115     gen = GETFIELD(IODA2_IVT_GEN, ive);
116 
117     /*
118      * The low order 2 bits are the link pointer (Type II interrupts).
119      * Shift back to get a valid IRQ server.
120      */
121     server >>= 2;
122 
123     switch (pq) {
124     case 0: /* 00 */
125         if (prio == 0xff) {
126             /* Masked, set Q */
127             phb3_msi_set_q(msi, srcno);
128         } else {
129             /* Enabled, set P and send */
130             phb3_msi_set_p(msi, srcno, gen);
131             icp_irq(ics, server, srcno + ics->offset, prio);
132         }
133         break;
134     case 2: /* 10 */
135         /* Already pending, set Q */
136         phb3_msi_set_q(msi, srcno);
137         break;
138     case 1: /* 01 */
139     case 3: /* 11 */
140     default:
141         /* Just drop stuff if Q already set */
142         break;
143     }
144 }
145 
146 static void phb3_msi_set_irq(void *opaque, int srcno, int val)
147 {
148     Phb3MsiState *msi = PHB3_MSI(opaque);
149 
150     if (val) {
151         phb3_msi_try_send(msi, srcno, false);
152     }
153 }
154 
155 
156 void pnv_phb3_msi_send(Phb3MsiState *msi, uint64_t addr, uint16_t data,
157                        int32_t dev_pe)
158 {
159     ICSState *ics = ICS(msi);
160     uint64_t ive;
161     uint16_t pe;
162     uint32_t src = ((addr >> 4) & 0xffff) | (data & 0x1f);
163 
164     if (src >= ics->nr_irqs) {
165         qemu_log_mask(LOG_GUEST_ERROR, "MSI %d out of bounds", src);
166         return;
167     }
168     if (dev_pe >= 0) {
169         if (!phb3_msi_read_ive(msi->phb, src, &ive)) {
170             return;
171         }
172         pe = GETFIELD(IODA2_IVT_PE, ive);
173         if (pe != dev_pe) {
174             qemu_log_mask(LOG_GUEST_ERROR,
175                           "MSI %d send by PE#%d but assigned to PE#%d",
176                           src, dev_pe, pe);
177             return;
178         }
179     }
180     qemu_irq_pulse(msi->qirqs[src]);
181 }
182 
183 void pnv_phb3_msi_ffi(Phb3MsiState *msi, uint64_t val)
184 {
185     /* Emit interrupt */
186     pnv_phb3_msi_send(msi, val, 0, -1);
187 
188     /* Clear FFI lock */
189     msi->phb->regs[PHB_FFI_LOCK >> 3] = 0;
190 }
191 
192 static void phb3_msi_reject(ICSState *ics, uint32_t nr)
193 {
194     Phb3MsiState *msi = PHB3_MSI(ics);
195     unsigned int srcno = nr - ics->offset;
196     unsigned int idx = srcno >> 6;
197     unsigned int bit = 1ull << (srcno & 0x3f);
198 
199     assert(srcno < PHB3_MAX_MSI);
200 
201     msi->rba[idx] |= bit;
202     msi->rba_sum |= (1u << idx);
203 }
204 
205 static void phb3_msi_resend(ICSState *ics)
206 {
207     Phb3MsiState *msi = PHB3_MSI(ics);
208     unsigned int i, j;
209 
210     if (msi->rba_sum == 0) {
211         return;
212     }
213 
214     for (i = 0; i < 32; i++) {
215         if ((msi->rba_sum & (1u << i)) == 0) {
216             continue;
217         }
218         msi->rba_sum &= ~(1u << i);
219         for (j = 0; j < 64; j++) {
220             if ((msi->rba[i] & (1ull << j)) == 0) {
221                 continue;
222             }
223             msi->rba[i] &= ~(1ull << j);
224             phb3_msi_try_send(msi, i * 64 + j, true);
225         }
226     }
227 }
228 
229 static void phb3_msi_reset(DeviceState *dev)
230 {
231     Phb3MsiState *msi = PHB3_MSI(dev);
232     ICSStateClass *icsc = ICS_GET_CLASS(dev);
233 
234     icsc->parent_reset(dev);
235 
236     memset(msi->rba, 0, sizeof(msi->rba));
237     msi->rba_sum = 0;
238 }
239 
240 static void phb3_msi_reset_handler(void *dev)
241 {
242     phb3_msi_reset(dev);
243 }
244 
245 void pnv_phb3_msi_update_config(Phb3MsiState *msi, uint32_t base,
246                                 uint32_t count)
247 {
248     ICSState *ics = ICS(msi);
249 
250     if (count > PHB3_MAX_MSI) {
251         count = PHB3_MAX_MSI;
252     }
253     ics->nr_irqs = count;
254     ics->offset = base;
255 }
256 
257 static void phb3_msi_realize(DeviceState *dev, Error **errp)
258 {
259     Phb3MsiState *msi = PHB3_MSI(dev);
260     ICSState *ics = ICS(msi);
261     ICSStateClass *icsc = ICS_GET_CLASS(ics);
262     Error *local_err = NULL;
263 
264     assert(msi->phb);
265 
266     icsc->parent_realize(dev, &local_err);
267     if (local_err) {
268         error_propagate(errp, local_err);
269         return;
270     }
271 
272     msi->qirqs = qemu_allocate_irqs(phb3_msi_set_irq, msi, ics->nr_irqs);
273 
274     qemu_register_reset(phb3_msi_reset_handler, dev);
275 }
276 
277 static void phb3_msi_instance_init(Object *obj)
278 {
279     Phb3MsiState *msi = PHB3_MSI(obj);
280     ICSState *ics = ICS(obj);
281 
282     object_property_add_link(obj, "phb", TYPE_PNV_PHB3,
283                              (Object **)&msi->phb,
284                              object_property_allow_set_link,
285                              OBJ_PROP_LINK_STRONG);
286 
287     /* Will be overriden later */
288     ics->offset = 0;
289 }
290 
291 static void phb3_msi_class_init(ObjectClass *klass, void *data)
292 {
293     DeviceClass *dc = DEVICE_CLASS(klass);
294     ICSStateClass *isc = ICS_CLASS(klass);
295 
296     device_class_set_parent_realize(dc, phb3_msi_realize,
297                                     &isc->parent_realize);
298     device_class_set_parent_reset(dc, phb3_msi_reset,
299                                   &isc->parent_reset);
300 
301     isc->reject = phb3_msi_reject;
302     isc->resend = phb3_msi_resend;
303 }
304 
305 static const TypeInfo phb3_msi_info = {
306     .name = TYPE_PHB3_MSI,
307     .parent = TYPE_ICS,
308     .instance_size = sizeof(Phb3MsiState),
309     .class_init = phb3_msi_class_init,
310     .class_size = sizeof(ICSStateClass),
311     .instance_init = phb3_msi_instance_init,
312 };
313 
314 static void pnv_phb3_msi_register_types(void)
315 {
316     type_register_static(&phb3_msi_info);
317 }
318 
319 type_init(pnv_phb3_msi_register_types);
320 
321 void pnv_phb3_msi_pic_print_info(Phb3MsiState *msi, Monitor *mon)
322 {
323     ICSState *ics = ICS(msi);
324     int i;
325 
326     monitor_printf(mon, "ICS %4x..%4x %p\n",
327                    ics->offset, ics->offset + ics->nr_irqs - 1, ics);
328 
329     for (i = 0; i < ics->nr_irqs; i++) {
330         uint64_t ive;
331 
332         if (!phb3_msi_read_ive(msi->phb, i, &ive)) {
333             return;
334         }
335 
336         if (GETFIELD(IODA2_IVT_PRIORITY, ive) == 0xff) {
337             continue;
338         }
339 
340         monitor_printf(mon, "  %4x %c%c server=%04x prio=%02x gen=%d\n",
341                        ics->offset + i,
342                        GETFIELD(IODA2_IVT_P, ive) ? 'P' : '-',
343                        GETFIELD(IODA2_IVT_Q, ive) ? 'Q' : '-',
344                        (uint32_t) GETFIELD(IODA2_IVT_SERVER, ive) >> 2,
345                        (uint32_t) GETFIELD(IODA2_IVT_PRIORITY, ive),
346                        (uint32_t) GETFIELD(IODA2_IVT_GEN, ive));
347     }
348 }
349