VirtualBox

source: vbox/trunk/src/VBox/Devices/Bus/MsiCommon.cpp@ 62563

Last change on this file since 62563 was 62518, checked in by vboxsync, 8 years ago

(C) 2016
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File size: 10.6 KB
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1/* $Id: MsiCommon.cpp 62518 2016-07-22 19:14:29Z vboxsync $ */
2/** @file
3 * MSI support routines
4 */
5
6/*
7 * Copyright (C) 2010-2016 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 */
17#define LOG_GROUP LOG_GROUP_DEV_PCI
18/* Hack to get PCIDEVICEINT declare at the right point - include "PCIInternal.h". */
19#define PCI_INCLUDE_PRIVATE
20#include <VBox/pci.h>
21#include <VBox/msi.h>
22#include <VBox/vmm/pdmdev.h>
23#include <VBox/log.h>
24
25#include "MsiCommon.h"
26
27DECLINLINE(uint16_t) msiGetMessageControl(PPCIDEVICE pDev)
28{
29 uint32_t idxMessageControl = pDev->Int.s.u8MsiCapOffset + VBOX_MSI_CAP_MESSAGE_CONTROL;
30#ifdef IN_RING3
31 if (pciDevIsPassthrough(pDev)) {
32 return pDev->Int.s.pfnConfigRead(pDev, idxMessageControl, 2);
33 }
34#endif
35 return PCIDevGetWord(pDev, idxMessageControl);
36}
37
38DECLINLINE(bool) msiIs64Bit(PPCIDEVICE pDev)
39{
40 return pciDevIsMsi64Capable(pDev);
41}
42
43DECLINLINE(uint32_t*) msiGetMaskBits(PPCIDEVICE pDev)
44{
45 uint8_t iOff = msiIs64Bit(pDev) ? VBOX_MSI_CAP_MASK_BITS_64 : VBOX_MSI_CAP_MASK_BITS_32;
46 /* passthrough devices may have no masked/pending support */
47 if (iOff >= pDev->Int.s.u8MsiCapSize)
48 return NULL;
49 iOff += pDev->Int.s.u8MsiCapOffset;
50 return (uint32_t*)(pDev->config + iOff);
51}
52
53DECLINLINE(uint32_t*) msiGetPendingBits(PPCIDEVICE pDev)
54{
55 uint8_t iOff = msiIs64Bit(pDev) ? VBOX_MSI_CAP_PENDING_BITS_64 : VBOX_MSI_CAP_PENDING_BITS_32;
56 /* passthrough devices may have no masked/pending support */
57 if (iOff >= pDev->Int.s.u8MsiCapSize)
58 return NULL;
59 iOff += pDev->Int.s.u8MsiCapOffset;
60 return (uint32_t*)(pDev->config + iOff);
61}
62
63DECLINLINE(bool) msiIsEnabled(PPCIDEVICE pDev)
64{
65 return (msiGetMessageControl(pDev) & VBOX_PCI_MSI_FLAGS_ENABLE) != 0;
66}
67
68DECLINLINE(uint8_t) msiGetMme(PPCIDEVICE pDev)
69{
70 return (msiGetMessageControl(pDev) & VBOX_PCI_MSI_FLAGS_QSIZE) >> 4;
71}
72
73DECLINLINE(RTGCPHYS) msiGetMsiAddress(PPCIDEVICE pDev)
74{
75 if (msiIs64Bit(pDev))
76 {
77 uint32_t lo = PCIDevGetDWord(pDev, pDev->Int.s.u8MsiCapOffset + VBOX_MSI_CAP_MESSAGE_ADDRESS_LO);
78 uint32_t hi = PCIDevGetDWord(pDev, pDev->Int.s.u8MsiCapOffset + VBOX_MSI_CAP_MESSAGE_ADDRESS_HI);
79 return RT_MAKE_U64(lo, hi);
80 }
81 else
82 {
83 return PCIDevGetDWord(pDev, pDev->Int.s.u8MsiCapOffset + VBOX_MSI_CAP_MESSAGE_ADDRESS_32);
84 }
85}
86
87DECLINLINE(uint32_t) msiGetMsiData(PPCIDEVICE pDev, int32_t iVector)
88{
89 int16_t iOff = msiIs64Bit(pDev) ? VBOX_MSI_CAP_MESSAGE_DATA_64 : VBOX_MSI_CAP_MESSAGE_DATA_32;
90 uint16_t lo = PCIDevGetWord(pDev, pDev->Int.s.u8MsiCapOffset + iOff);
91
92 // vector encoding into lower bits of message data
93 uint8_t bits = msiGetMme(pDev);
94 uint16_t uMask = ((1 << bits) - 1);
95 lo &= ~uMask;
96 lo |= iVector & uMask;
97
98 return RT_MAKE_U32(lo, 0);
99}
100
101DECLINLINE(bool) msiBitJustCleared(uint32_t uOldValue,
102 uint32_t uNewValue,
103 uint32_t uMask)
104{
105 return (!!(uOldValue & uMask) && !(uNewValue & uMask));
106}
107
108DECLINLINE(bool) msiBitJustSet(uint32_t uOldValue,
109 uint32_t uNewValue,
110 uint32_t uMask)
111{
112 return (!(uOldValue & uMask) && !!(uNewValue & uMask));
113}
114
115#ifdef IN_RING3
116void MsiPciConfigWrite(PPDMDEVINS pDevIns, PCPDMPCIHLP pPciHlp, PPCIDEVICE pDev,
117 uint32_t u32Address, uint32_t val, unsigned len)
118{
119 int32_t iOff = u32Address - pDev->Int.s.u8MsiCapOffset;
120 Assert(iOff >= 0 && (pciDevIsMsiCapable(pDev) && iOff < pDev->Int.s.u8MsiCapSize));
121
122 Log2(("MsiPciConfigWrite: %d <- %x (%d)\n", iOff, val, len));
123
124 uint32_t uAddr = u32Address;
125 bool f64Bit = msiIs64Bit(pDev);
126
127 for (uint32_t i = 0; i < len; i++)
128 {
129 uint32_t reg = i + iOff;
130 uint8_t u8Val = (uint8_t)val;
131 switch (reg)
132 {
133 case 0: /* Capability ID, ro */
134 case 1: /* Next pointer, ro */
135 break;
136 case VBOX_MSI_CAP_MESSAGE_CONTROL:
137 /* don't change read-only bits: 1-3,7 */
138 u8Val &= UINT8_C(~0x8e);
139 pDev->config[uAddr] = u8Val | (pDev->config[uAddr] & UINT8_C(0x8e));
140 break;
141 case VBOX_MSI_CAP_MESSAGE_CONTROL + 1:
142 /* don't change read-only bit 8, and reserved 9-15 */
143 break;
144 default:
145 if (pDev->config[uAddr] != u8Val)
146 {
147 int32_t maskUpdated = -1;
148
149 /* If we're enabling masked vector, and have pending messages
150 for this vector, we have to send this message now */
151 if ( !f64Bit
152 && (reg >= VBOX_MSI_CAP_MASK_BITS_32)
153 && (reg < VBOX_MSI_CAP_MASK_BITS_32 + 4)
154 )
155 {
156 maskUpdated = reg - VBOX_MSI_CAP_MASK_BITS_32;
157 }
158 if ( f64Bit
159 && (reg >= VBOX_MSI_CAP_MASK_BITS_64)
160 && (reg < VBOX_MSI_CAP_MASK_BITS_64 + 4)
161 )
162 {
163 maskUpdated = reg - VBOX_MSI_CAP_MASK_BITS_64;
164 }
165
166 if (maskUpdated != -1 && msiIsEnabled(pDev))
167 {
168 uint32_t* puPending = msiGetPendingBits(pDev);
169 for (int iBitNum = 0; iBitNum < 8; iBitNum++)
170 {
171 int32_t iBit = 1 << iBitNum;
172 uint32_t uVector = maskUpdated*8 + iBitNum;
173
174 if (msiBitJustCleared(pDev->config[uAddr], u8Val, iBit))
175 {
176 Log(("msi: mask updated bit %d@%x (%d)\n", iBitNum, uAddr, maskUpdated));
177
178 /* To ensure that we're no longer masked */
179 pDev->config[uAddr] &= ~iBit;
180 if ((*puPending & (1 << uVector)) != 0)
181 {
182 Log(("msi: notify earlier masked pending vector: %d\n", uVector));
183 MsiNotify(pDevIns, pPciHlp, pDev, uVector, PDM_IRQ_LEVEL_HIGH, 0 /*uTagSrc*/);
184 }
185 }
186 if (msiBitJustSet(pDev->config[uAddr], u8Val, iBit))
187 {
188 Log(("msi: mask vector: %d\n", uVector));
189 }
190 }
191 }
192
193 pDev->config[uAddr] = u8Val;
194 }
195 }
196 uAddr++;
197 val >>= 8;
198 }
199}
200
201uint32_t MsiPciConfigRead (PPDMDEVINS pDevIns, PPCIDEVICE pDev, uint32_t u32Address, unsigned len)
202{
203 int32_t iOff = u32Address - pDev->Int.s.u8MsiCapOffset;
204
205 Assert(iOff >= 0 && (pciDevIsMsiCapable(pDev) && iOff < pDev->Int.s.u8MsiCapSize));
206 uint32_t rv = 0;
207
208 switch (len)
209 {
210 case 1:
211 rv = PCIDevGetByte(pDev, u32Address);
212 break;
213 case 2:
214 rv = PCIDevGetWord(pDev, u32Address);
215 break;
216 case 4:
217 rv = PCIDevGetDWord(pDev, u32Address);
218 break;
219 default:
220 Assert(false);
221 }
222
223 Log2(("MsiPciConfigRead: %d (%d) -> %x\n", iOff, len, rv));
224
225 return rv;
226}
227
228int MsiInit(PPCIDEVICE pDev, PPDMMSIREG pMsiReg)
229{
230 if (pMsiReg->cMsiVectors == 0)
231 return VINF_SUCCESS;
232
233 /* XXX: done in pcirawAnalyzePciCaps() */
234 if (pciDevIsPassthrough(pDev))
235 return VINF_SUCCESS;
236
237 uint16_t cVectors = pMsiReg->cMsiVectors;
238 uint8_t iCapOffset = pMsiReg->iMsiCapOffset;
239 uint8_t iNextOffset = pMsiReg->iMsiNextOffset;
240 bool f64bit = pMsiReg->fMsi64bit;
241 uint16_t iFlags = 0;
242 int iMmc;
243
244 /* Compute multiple-message capable bitfield */
245 for (iMmc = 0; iMmc < 6; iMmc++)
246 {
247 if ((1 << iMmc) >= cVectors)
248 break;
249 }
250
251 if ((cVectors > VBOX_MSI_MAX_ENTRIES) || (1 << iMmc) < cVectors)
252 return VERR_TOO_MUCH_DATA;
253
254 Assert(iCapOffset != 0 && iCapOffset < 0xff && iNextOffset < 0xff);
255
256 /* We always support per-vector masking */
257 iFlags |= VBOX_PCI_MSI_FLAGS_MASKBIT | iMmc;
258 if (f64bit)
259 iFlags |= VBOX_PCI_MSI_FLAGS_64BIT;
260 /* How many vectors we're capable of */
261 iFlags |= iMmc;
262
263 pDev->Int.s.u8MsiCapOffset = iCapOffset;
264 pDev->Int.s.u8MsiCapSize = f64bit ? VBOX_MSI_CAP_SIZE_64 : VBOX_MSI_CAP_SIZE_32;
265
266 PCIDevSetByte(pDev, iCapOffset + 0, VBOX_PCI_CAP_ID_MSI);
267 PCIDevSetByte(pDev, iCapOffset + 1, iNextOffset); /* next */
268 PCIDevSetWord(pDev, iCapOffset + VBOX_MSI_CAP_MESSAGE_CONTROL, iFlags);
269
270 *msiGetMaskBits(pDev) = 0;
271 *msiGetPendingBits(pDev) = 0;
272
273 pciDevSetMsiCapable(pDev);
274
275 return VINF_SUCCESS;
276}
277
278#endif /* IN_RING3 */
279
280
281bool MsiIsEnabled(PPCIDEVICE pDev)
282{
283 return pciDevIsMsiCapable(pDev) && msiIsEnabled(pDev);
284}
285
286void MsiNotify(PPDMDEVINS pDevIns, PCPDMPCIHLP pPciHlp, PPCIDEVICE pDev, int iVector, int iLevel, uint32_t uTagSrc)
287{
288 AssertMsg(msiIsEnabled(pDev), ("Must be enabled to use that"));
289
290 uint32_t uMask;
291 uint32_t *puPending = msiGetPendingBits(pDev);
292 if (puPending)
293 {
294 uint32_t *puMask = msiGetMaskBits(pDev);
295 AssertPtr(puMask);
296 uMask = *puMask;
297 LogFlow(("MsiNotify: %d pending=%x mask=%x\n", iVector, *puPending, uMask));
298 }
299 else
300 {
301 uMask = 0;
302 LogFlow(("MsiNotify: %d\n", iVector));
303 }
304
305 /* We only trigger MSI on level up */
306 if ((iLevel & PDM_IRQ_LEVEL_HIGH) == 0)
307 {
308 /* @todo: maybe clear pending interrupts on level down? */
309#if 0
310 if (puPending)
311 {
312 *puPending &= ~(1<<iVector);
313 LogFlow(("msi: clear pending %d, now %x\n", iVector, *puPending));
314 }
315#endif
316 return;
317 }
318
319 if ((uMask & (1<<iVector)) != 0)
320 {
321 *puPending |= (1<<iVector);
322 LogFlow(("msi: %d is masked, mark pending, now %x\n", iVector, *puPending));
323 return;
324 }
325
326 RTGCPHYS GCAddr = msiGetMsiAddress(pDev);
327 uint32_t u32Value = msiGetMsiData(pDev, iVector);
328
329 if (puPending)
330 *puPending &= ~(1<<iVector);
331
332 Assert(pPciHlp->pfnIoApicSendMsi != NULL);
333 pPciHlp->pfnIoApicSendMsi(pDevIns, GCAddr, u32Value, uTagSrc);
334}
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