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1 | e4c7d2ae | Isaku Yamahata | /*
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2 | e4c7d2ae | Isaku Yamahata | * msi.c
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3 | e4c7d2ae | Isaku Yamahata | *
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4 | e4c7d2ae | Isaku Yamahata | * Copyright (c) 2010 Isaku Yamahata <yamahata at valinux co jp>
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5 | e4c7d2ae | Isaku Yamahata | * VA Linux Systems Japan K.K.
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6 | e4c7d2ae | Isaku Yamahata | *
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7 | e4c7d2ae | Isaku Yamahata | * This program is free software; you can redistribute it and/or modify
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8 | e4c7d2ae | Isaku Yamahata | * it under the terms of the GNU General Public License as published by
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9 | e4c7d2ae | Isaku Yamahata | * the Free Software Foundation; either version 2 of the License, or
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10 | e4c7d2ae | Isaku Yamahata | * (at your option) any later version.
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11 | e4c7d2ae | Isaku Yamahata | |
12 | e4c7d2ae | Isaku Yamahata | * This program is distributed in the hope that it will be useful,
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13 | e4c7d2ae | Isaku Yamahata | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | e4c7d2ae | Isaku Yamahata | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | e4c7d2ae | Isaku Yamahata | * GNU General Public License for more details.
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16 | e4c7d2ae | Isaku Yamahata | |
17 | e4c7d2ae | Isaku Yamahata | * You should have received a copy of the GNU General Public License along
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18 | e4c7d2ae | Isaku Yamahata | * with this program; if not, see <http://www.gnu.org/licenses/>.
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19 | e4c7d2ae | Isaku Yamahata | */
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20 | e4c7d2ae | Isaku Yamahata | |
21 | e4c7d2ae | Isaku Yamahata | #include "msi.h" |
22 | 5afb9869 | Blue Swirl | #include "range.h" |
23 | e4c7d2ae | Isaku Yamahata | |
24 | e4c7d2ae | Isaku Yamahata | /* Eventually those constants should go to Linux pci_regs.h */
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25 | e4c7d2ae | Isaku Yamahata | #define PCI_MSI_PENDING_32 0x10 |
26 | e4c7d2ae | Isaku Yamahata | #define PCI_MSI_PENDING_64 0x14 |
27 | e4c7d2ae | Isaku Yamahata | |
28 | e4c7d2ae | Isaku Yamahata | /* PCI_MSI_ADDRESS_LO */
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29 | e4c7d2ae | Isaku Yamahata | #define PCI_MSI_ADDRESS_LO_MASK (~0x3) |
30 | e4c7d2ae | Isaku Yamahata | |
31 | e4c7d2ae | Isaku Yamahata | /* If we get rid of cap allocator, we won't need those. */
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32 | e4c7d2ae | Isaku Yamahata | #define PCI_MSI_32_SIZEOF 0x0a |
33 | e4c7d2ae | Isaku Yamahata | #define PCI_MSI_64_SIZEOF 0x0e |
34 | e4c7d2ae | Isaku Yamahata | #define PCI_MSI_32M_SIZEOF 0x14 |
35 | e4c7d2ae | Isaku Yamahata | #define PCI_MSI_64M_SIZEOF 0x18 |
36 | e4c7d2ae | Isaku Yamahata | |
37 | e4c7d2ae | Isaku Yamahata | #define PCI_MSI_VECTORS_MAX 32 |
38 | e4c7d2ae | Isaku Yamahata | |
39 | 60ba3cc2 | Jan Kiszka | /* Flag for interrupt controller to declare MSI/MSI-X support */
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40 | 60ba3cc2 | Jan Kiszka | bool msi_supported;
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41 | 60ba3cc2 | Jan Kiszka | |
42 | e4c7d2ae | Isaku Yamahata | /* If we get rid of cap allocator, we won't need this. */
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43 | e4c7d2ae | Isaku Yamahata | static inline uint8_t msi_cap_sizeof(uint16_t flags) |
44 | e4c7d2ae | Isaku Yamahata | { |
45 | e4c7d2ae | Isaku Yamahata | switch (flags & (PCI_MSI_FLAGS_MASKBIT | PCI_MSI_FLAGS_64BIT)) {
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46 | e4c7d2ae | Isaku Yamahata | case PCI_MSI_FLAGS_MASKBIT | PCI_MSI_FLAGS_64BIT:
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47 | e4c7d2ae | Isaku Yamahata | return PCI_MSI_64M_SIZEOF;
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48 | e4c7d2ae | Isaku Yamahata | case PCI_MSI_FLAGS_64BIT:
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49 | e4c7d2ae | Isaku Yamahata | return PCI_MSI_64_SIZEOF;
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50 | e4c7d2ae | Isaku Yamahata | case PCI_MSI_FLAGS_MASKBIT:
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51 | e4c7d2ae | Isaku Yamahata | return PCI_MSI_32M_SIZEOF;
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52 | e4c7d2ae | Isaku Yamahata | case 0: |
53 | e4c7d2ae | Isaku Yamahata | return PCI_MSI_32_SIZEOF;
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54 | e4c7d2ae | Isaku Yamahata | default:
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55 | e4c7d2ae | Isaku Yamahata | abort(); |
56 | e4c7d2ae | Isaku Yamahata | break;
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57 | e4c7d2ae | Isaku Yamahata | } |
58 | e4c7d2ae | Isaku Yamahata | return 0; |
59 | e4c7d2ae | Isaku Yamahata | } |
60 | e4c7d2ae | Isaku Yamahata | |
61 | e4c7d2ae | Isaku Yamahata | //#define MSI_DEBUG
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62 | e4c7d2ae | Isaku Yamahata | |
63 | e4c7d2ae | Isaku Yamahata | #ifdef MSI_DEBUG
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64 | e4c7d2ae | Isaku Yamahata | # define MSI_DPRINTF(fmt, ...) \
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65 | e4c7d2ae | Isaku Yamahata | fprintf(stderr, "%s:%d " fmt, __func__, __LINE__, ## __VA_ARGS__) |
66 | e4c7d2ae | Isaku Yamahata | #else
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67 | e4c7d2ae | Isaku Yamahata | # define MSI_DPRINTF(fmt, ...) do { } while (0) |
68 | e4c7d2ae | Isaku Yamahata | #endif
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69 | e4c7d2ae | Isaku Yamahata | #define MSI_DEV_PRINTF(dev, fmt, ...) \
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70 | e4c7d2ae | Isaku Yamahata | MSI_DPRINTF("%s:%x " fmt, (dev)->name, (dev)->devfn, ## __VA_ARGS__) |
71 | e4c7d2ae | Isaku Yamahata | |
72 | e4c7d2ae | Isaku Yamahata | static inline unsigned int msi_nr_vectors(uint16_t flags) |
73 | e4c7d2ae | Isaku Yamahata | { |
74 | e4c7d2ae | Isaku Yamahata | return 1U << |
75 | e4c7d2ae | Isaku Yamahata | ((flags & PCI_MSI_FLAGS_QSIZE) >> (ffs(PCI_MSI_FLAGS_QSIZE) - 1));
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76 | e4c7d2ae | Isaku Yamahata | } |
77 | e4c7d2ae | Isaku Yamahata | |
78 | e4c7d2ae | Isaku Yamahata | static inline uint8_t msi_flags_off(const PCIDevice* dev) |
79 | e4c7d2ae | Isaku Yamahata | { |
80 | e4c7d2ae | Isaku Yamahata | return dev->msi_cap + PCI_MSI_FLAGS;
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81 | e4c7d2ae | Isaku Yamahata | } |
82 | e4c7d2ae | Isaku Yamahata | |
83 | e4c7d2ae | Isaku Yamahata | static inline uint8_t msi_address_lo_off(const PCIDevice* dev) |
84 | e4c7d2ae | Isaku Yamahata | { |
85 | e4c7d2ae | Isaku Yamahata | return dev->msi_cap + PCI_MSI_ADDRESS_LO;
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86 | e4c7d2ae | Isaku Yamahata | } |
87 | e4c7d2ae | Isaku Yamahata | |
88 | e4c7d2ae | Isaku Yamahata | static inline uint8_t msi_address_hi_off(const PCIDevice* dev) |
89 | e4c7d2ae | Isaku Yamahata | { |
90 | e4c7d2ae | Isaku Yamahata | return dev->msi_cap + PCI_MSI_ADDRESS_HI;
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91 | e4c7d2ae | Isaku Yamahata | } |
92 | e4c7d2ae | Isaku Yamahata | |
93 | e4c7d2ae | Isaku Yamahata | static inline uint8_t msi_data_off(const PCIDevice* dev, bool msi64bit) |
94 | e4c7d2ae | Isaku Yamahata | { |
95 | e4c7d2ae | Isaku Yamahata | return dev->msi_cap + (msi64bit ? PCI_MSI_DATA_64 : PCI_MSI_DATA_32);
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96 | e4c7d2ae | Isaku Yamahata | } |
97 | e4c7d2ae | Isaku Yamahata | |
98 | e4c7d2ae | Isaku Yamahata | static inline uint8_t msi_mask_off(const PCIDevice* dev, bool msi64bit) |
99 | e4c7d2ae | Isaku Yamahata | { |
100 | e4c7d2ae | Isaku Yamahata | return dev->msi_cap + (msi64bit ? PCI_MSI_MASK_64 : PCI_MSI_MASK_32);
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101 | e4c7d2ae | Isaku Yamahata | } |
102 | e4c7d2ae | Isaku Yamahata | |
103 | e4c7d2ae | Isaku Yamahata | static inline uint8_t msi_pending_off(const PCIDevice* dev, bool msi64bit) |
104 | e4c7d2ae | Isaku Yamahata | { |
105 | e4c7d2ae | Isaku Yamahata | return dev->msi_cap + (msi64bit ? PCI_MSI_PENDING_64 : PCI_MSI_PENDING_32);
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106 | e4c7d2ae | Isaku Yamahata | } |
107 | e4c7d2ae | Isaku Yamahata | |
108 | e4c7d2ae | Isaku Yamahata | bool msi_enabled(const PCIDevice *dev) |
109 | e4c7d2ae | Isaku Yamahata | { |
110 | e4c7d2ae | Isaku Yamahata | return msi_present(dev) &&
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111 | e4c7d2ae | Isaku Yamahata | (pci_get_word(dev->config + msi_flags_off(dev)) & |
112 | e4c7d2ae | Isaku Yamahata | PCI_MSI_FLAGS_ENABLE); |
113 | e4c7d2ae | Isaku Yamahata | } |
114 | e4c7d2ae | Isaku Yamahata | |
115 | e4c7d2ae | Isaku Yamahata | int msi_init(struct PCIDevice *dev, uint8_t offset, |
116 | e4c7d2ae | Isaku Yamahata | unsigned int nr_vectors, bool msi64bit, bool msi_per_vector_mask) |
117 | e4c7d2ae | Isaku Yamahata | { |
118 | e4c7d2ae | Isaku Yamahata | unsigned int vectors_order; |
119 | e4c7d2ae | Isaku Yamahata | uint16_t flags; |
120 | e4c7d2ae | Isaku Yamahata | uint8_t cap_size; |
121 | e4c7d2ae | Isaku Yamahata | int config_offset;
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122 | 60ba3cc2 | Jan Kiszka | |
123 | 60ba3cc2 | Jan Kiszka | if (!msi_supported) {
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124 | 60ba3cc2 | Jan Kiszka | return -ENOTSUP;
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125 | 60ba3cc2 | Jan Kiszka | } |
126 | 60ba3cc2 | Jan Kiszka | |
127 | e4c7d2ae | Isaku Yamahata | MSI_DEV_PRINTF(dev, |
128 | e4c7d2ae | Isaku Yamahata | "init offset: 0x%"PRIx8" vector: %"PRId8 |
129 | e4c7d2ae | Isaku Yamahata | " 64bit %d mask %d\n",
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130 | e4c7d2ae | Isaku Yamahata | offset, nr_vectors, msi64bit, msi_per_vector_mask); |
131 | e4c7d2ae | Isaku Yamahata | |
132 | e4c7d2ae | Isaku Yamahata | assert(!(nr_vectors & (nr_vectors - 1))); /* power of 2 */ |
133 | e4c7d2ae | Isaku Yamahata | assert(nr_vectors > 0);
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134 | e4c7d2ae | Isaku Yamahata | assert(nr_vectors <= PCI_MSI_VECTORS_MAX); |
135 | e4c7d2ae | Isaku Yamahata | /* the nr of MSI vectors is up to 32 */
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136 | e4c7d2ae | Isaku Yamahata | vectors_order = ffs(nr_vectors) - 1;
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137 | e4c7d2ae | Isaku Yamahata | |
138 | e4c7d2ae | Isaku Yamahata | flags = vectors_order << (ffs(PCI_MSI_FLAGS_QMASK) - 1);
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139 | e4c7d2ae | Isaku Yamahata | if (msi64bit) {
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140 | e4c7d2ae | Isaku Yamahata | flags |= PCI_MSI_FLAGS_64BIT; |
141 | e4c7d2ae | Isaku Yamahata | } |
142 | e4c7d2ae | Isaku Yamahata | if (msi_per_vector_mask) {
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143 | e4c7d2ae | Isaku Yamahata | flags |= PCI_MSI_FLAGS_MASKBIT; |
144 | e4c7d2ae | Isaku Yamahata | } |
145 | e4c7d2ae | Isaku Yamahata | |
146 | e4c7d2ae | Isaku Yamahata | cap_size = msi_cap_sizeof(flags); |
147 | e4c7d2ae | Isaku Yamahata | config_offset = pci_add_capability(dev, PCI_CAP_ID_MSI, offset, cap_size); |
148 | e4c7d2ae | Isaku Yamahata | if (config_offset < 0) { |
149 | e4c7d2ae | Isaku Yamahata | return config_offset;
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150 | e4c7d2ae | Isaku Yamahata | } |
151 | e4c7d2ae | Isaku Yamahata | |
152 | e4c7d2ae | Isaku Yamahata | dev->msi_cap = config_offset; |
153 | e4c7d2ae | Isaku Yamahata | dev->cap_present |= QEMU_PCI_CAP_MSI; |
154 | e4c7d2ae | Isaku Yamahata | |
155 | e4c7d2ae | Isaku Yamahata | pci_set_word(dev->config + msi_flags_off(dev), flags); |
156 | e4c7d2ae | Isaku Yamahata | pci_set_word(dev->wmask + msi_flags_off(dev), |
157 | e4c7d2ae | Isaku Yamahata | PCI_MSI_FLAGS_QSIZE | PCI_MSI_FLAGS_ENABLE); |
158 | e4c7d2ae | Isaku Yamahata | pci_set_long(dev->wmask + msi_address_lo_off(dev), |
159 | e4c7d2ae | Isaku Yamahata | PCI_MSI_ADDRESS_LO_MASK); |
160 | e4c7d2ae | Isaku Yamahata | if (msi64bit) {
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161 | e4c7d2ae | Isaku Yamahata | pci_set_long(dev->wmask + msi_address_hi_off(dev), 0xffffffff);
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162 | e4c7d2ae | Isaku Yamahata | } |
163 | e4c7d2ae | Isaku Yamahata | pci_set_word(dev->wmask + msi_data_off(dev, msi64bit), 0xffff);
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164 | e4c7d2ae | Isaku Yamahata | |
165 | e4c7d2ae | Isaku Yamahata | if (msi_per_vector_mask) {
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166 | ebabb67a | Stefan Weil | /* Make mask bits 0 to nr_vectors - 1 writable. */
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167 | e4c7d2ae | Isaku Yamahata | pci_set_long(dev->wmask + msi_mask_off(dev, msi64bit), |
168 | e4c7d2ae | Isaku Yamahata | 0xffffffff >> (PCI_MSI_VECTORS_MAX - nr_vectors));
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169 | e4c7d2ae | Isaku Yamahata | } |
170 | e4c7d2ae | Isaku Yamahata | return config_offset;
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171 | e4c7d2ae | Isaku Yamahata | } |
172 | e4c7d2ae | Isaku Yamahata | |
173 | e4c7d2ae | Isaku Yamahata | void msi_uninit(struct PCIDevice *dev) |
174 | e4c7d2ae | Isaku Yamahata | { |
175 | 45fe15c2 | Jan Kiszka | uint16_t flags; |
176 | 45fe15c2 | Jan Kiszka | uint8_t cap_size; |
177 | 45fe15c2 | Jan Kiszka | |
178 | 45fe15c2 | Jan Kiszka | if (!(dev->cap_present & QEMU_PCI_CAP_MSI)) {
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179 | 45fe15c2 | Jan Kiszka | return;
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180 | 45fe15c2 | Jan Kiszka | } |
181 | 45fe15c2 | Jan Kiszka | flags = pci_get_word(dev->config + msi_flags_off(dev)); |
182 | 45fe15c2 | Jan Kiszka | cap_size = msi_cap_sizeof(flags); |
183 | 4dad7f1e | Jan Kiszka | pci_del_capability(dev, PCI_CAP_ID_MSI, cap_size); |
184 | 45fe15c2 | Jan Kiszka | dev->cap_present &= ~QEMU_PCI_CAP_MSI; |
185 | 45fe15c2 | Jan Kiszka | |
186 | e4c7d2ae | Isaku Yamahata | MSI_DEV_PRINTF(dev, "uninit\n");
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187 | e4c7d2ae | Isaku Yamahata | } |
188 | e4c7d2ae | Isaku Yamahata | |
189 | e4c7d2ae | Isaku Yamahata | void msi_reset(PCIDevice *dev)
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190 | e4c7d2ae | Isaku Yamahata | { |
191 | e4c7d2ae | Isaku Yamahata | uint16_t flags; |
192 | e4c7d2ae | Isaku Yamahata | bool msi64bit;
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193 | e4c7d2ae | Isaku Yamahata | |
194 | e4c7d2ae | Isaku Yamahata | flags = pci_get_word(dev->config + msi_flags_off(dev)); |
195 | e4c7d2ae | Isaku Yamahata | flags &= ~(PCI_MSI_FLAGS_QSIZE | PCI_MSI_FLAGS_ENABLE); |
196 | e4c7d2ae | Isaku Yamahata | msi64bit = flags & PCI_MSI_FLAGS_64BIT; |
197 | e4c7d2ae | Isaku Yamahata | |
198 | e4c7d2ae | Isaku Yamahata | pci_set_word(dev->config + msi_flags_off(dev), flags); |
199 | e4c7d2ae | Isaku Yamahata | pci_set_long(dev->config + msi_address_lo_off(dev), 0);
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200 | e4c7d2ae | Isaku Yamahata | if (msi64bit) {
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201 | e4c7d2ae | Isaku Yamahata | pci_set_long(dev->config + msi_address_hi_off(dev), 0);
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202 | e4c7d2ae | Isaku Yamahata | } |
203 | e4c7d2ae | Isaku Yamahata | pci_set_word(dev->config + msi_data_off(dev, msi64bit), 0);
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204 | e4c7d2ae | Isaku Yamahata | if (flags & PCI_MSI_FLAGS_MASKBIT) {
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205 | e4c7d2ae | Isaku Yamahata | pci_set_long(dev->config + msi_mask_off(dev, msi64bit), 0);
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206 | e4c7d2ae | Isaku Yamahata | pci_set_long(dev->config + msi_pending_off(dev, msi64bit), 0);
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207 | e4c7d2ae | Isaku Yamahata | } |
208 | e4c7d2ae | Isaku Yamahata | MSI_DEV_PRINTF(dev, "reset\n");
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209 | e4c7d2ae | Isaku Yamahata | } |
210 | e4c7d2ae | Isaku Yamahata | |
211 | e4c7d2ae | Isaku Yamahata | static bool msi_is_masked(const PCIDevice *dev, unsigned int vector) |
212 | e4c7d2ae | Isaku Yamahata | { |
213 | e4c7d2ae | Isaku Yamahata | uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev)); |
214 | e4c7d2ae | Isaku Yamahata | uint32_t mask; |
215 | e4c7d2ae | Isaku Yamahata | assert(vector < PCI_MSI_VECTORS_MAX); |
216 | e4c7d2ae | Isaku Yamahata | |
217 | e4c7d2ae | Isaku Yamahata | if (!(flags & PCI_MSI_FLAGS_MASKBIT)) {
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218 | e4c7d2ae | Isaku Yamahata | return false; |
219 | e4c7d2ae | Isaku Yamahata | } |
220 | e4c7d2ae | Isaku Yamahata | |
221 | e4c7d2ae | Isaku Yamahata | mask = pci_get_long(dev->config + |
222 | e4c7d2ae | Isaku Yamahata | msi_mask_off(dev, flags & PCI_MSI_FLAGS_64BIT)); |
223 | e4c7d2ae | Isaku Yamahata | return mask & (1U << vector); |
224 | e4c7d2ae | Isaku Yamahata | } |
225 | e4c7d2ae | Isaku Yamahata | |
226 | e4c7d2ae | Isaku Yamahata | void msi_notify(PCIDevice *dev, unsigned int vector) |
227 | e4c7d2ae | Isaku Yamahata | { |
228 | e4c7d2ae | Isaku Yamahata | uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev)); |
229 | e4c7d2ae | Isaku Yamahata | bool msi64bit = flags & PCI_MSI_FLAGS_64BIT;
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230 | e4c7d2ae | Isaku Yamahata | unsigned int nr_vectors = msi_nr_vectors(flags); |
231 | e4c7d2ae | Isaku Yamahata | uint64_t address; |
232 | e4c7d2ae | Isaku Yamahata | uint32_t data; |
233 | e4c7d2ae | Isaku Yamahata | |
234 | e4c7d2ae | Isaku Yamahata | assert(vector < nr_vectors); |
235 | e4c7d2ae | Isaku Yamahata | if (msi_is_masked(dev, vector)) {
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236 | e4c7d2ae | Isaku Yamahata | assert(flags & PCI_MSI_FLAGS_MASKBIT); |
237 | e4c7d2ae | Isaku Yamahata | pci_long_test_and_set_mask( |
238 | e4c7d2ae | Isaku Yamahata | dev->config + msi_pending_off(dev, msi64bit), 1U << vector);
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239 | e4c7d2ae | Isaku Yamahata | MSI_DEV_PRINTF(dev, "pending vector 0x%x\n", vector);
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240 | e4c7d2ae | Isaku Yamahata | return;
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241 | e4c7d2ae | Isaku Yamahata | } |
242 | e4c7d2ae | Isaku Yamahata | |
243 | b794ec7c | Michael S. Tsirkin | if (msi64bit) {
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244 | e4c7d2ae | Isaku Yamahata | address = pci_get_quad(dev->config + msi_address_lo_off(dev)); |
245 | e4c7d2ae | Isaku Yamahata | } else {
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246 | e4c7d2ae | Isaku Yamahata | address = pci_get_long(dev->config + msi_address_lo_off(dev)); |
247 | e4c7d2ae | Isaku Yamahata | } |
248 | e4c7d2ae | Isaku Yamahata | |
249 | e4c7d2ae | Isaku Yamahata | /* upper bit 31:16 is zero */
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250 | e4c7d2ae | Isaku Yamahata | data = pci_get_word(dev->config + msi_data_off(dev, msi64bit)); |
251 | e4c7d2ae | Isaku Yamahata | if (nr_vectors > 1) { |
252 | e4c7d2ae | Isaku Yamahata | data &= ~(nr_vectors - 1);
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253 | e4c7d2ae | Isaku Yamahata | data |= vector; |
254 | e4c7d2ae | Isaku Yamahata | } |
255 | e4c7d2ae | Isaku Yamahata | |
256 | e4c7d2ae | Isaku Yamahata | MSI_DEV_PRINTF(dev, |
257 | e4c7d2ae | Isaku Yamahata | "notify vector 0x%x"
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258 | e4c7d2ae | Isaku Yamahata | " address: 0x%"PRIx64" data: 0x%"PRIx32"\n", |
259 | e4c7d2ae | Isaku Yamahata | vector, address, data); |
260 | c5d29d2f | Alexander Graf | stl_le_phys(address, data); |
261 | e4c7d2ae | Isaku Yamahata | } |
262 | e4c7d2ae | Isaku Yamahata | |
263 | e4c7d2ae | Isaku Yamahata | /* call this function after updating configs by pci_default_write_config(). */
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264 | e4c7d2ae | Isaku Yamahata | void msi_write_config(PCIDevice *dev, uint32_t addr, uint32_t val, int len) |
265 | e4c7d2ae | Isaku Yamahata | { |
266 | e4c7d2ae | Isaku Yamahata | uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev)); |
267 | e4c7d2ae | Isaku Yamahata | bool msi64bit = flags & PCI_MSI_FLAGS_64BIT;
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268 | e4c7d2ae | Isaku Yamahata | bool msi_per_vector_mask = flags & PCI_MSI_FLAGS_MASKBIT;
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269 | e4c7d2ae | Isaku Yamahata | unsigned int nr_vectors; |
270 | e4c7d2ae | Isaku Yamahata | uint8_t log_num_vecs; |
271 | e4c7d2ae | Isaku Yamahata | uint8_t log_max_vecs; |
272 | e4c7d2ae | Isaku Yamahata | unsigned int vector; |
273 | e4c7d2ae | Isaku Yamahata | uint32_t pending; |
274 | e4c7d2ae | Isaku Yamahata | |
275 | 531a0b82 | Michael S. Tsirkin | if (!ranges_overlap(addr, len, dev->msi_cap, msi_cap_sizeof(flags))) {
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276 | 531a0b82 | Michael S. Tsirkin | return;
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277 | e4c7d2ae | Isaku Yamahata | } |
278 | e4c7d2ae | Isaku Yamahata | |
279 | 531a0b82 | Michael S. Tsirkin | #ifdef MSI_DEBUG
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280 | 531a0b82 | Michael S. Tsirkin | MSI_DEV_PRINTF(dev, "addr 0x%"PRIx32" val 0x%"PRIx32" len %d\n", |
281 | 531a0b82 | Michael S. Tsirkin | addr, val, len); |
282 | 531a0b82 | Michael S. Tsirkin | MSI_DEV_PRINTF(dev, "ctrl: 0x%"PRIx16" address: 0x%"PRIx32, |
283 | 531a0b82 | Michael S. Tsirkin | flags, |
284 | 531a0b82 | Michael S. Tsirkin | pci_get_long(dev->config + msi_address_lo_off(dev))); |
285 | 531a0b82 | Michael S. Tsirkin | if (msi64bit) {
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286 | b794ec7c | Michael S. Tsirkin | fprintf(stderr, " address-hi: 0x%"PRIx32,
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287 | 531a0b82 | Michael S. Tsirkin | pci_get_long(dev->config + msi_address_hi_off(dev))); |
288 | 531a0b82 | Michael S. Tsirkin | } |
289 | 531a0b82 | Michael S. Tsirkin | fprintf(stderr, " data: 0x%"PRIx16,
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290 | 531a0b82 | Michael S. Tsirkin | pci_get_word(dev->config + msi_data_off(dev, msi64bit))); |
291 | 531a0b82 | Michael S. Tsirkin | if (flags & PCI_MSI_FLAGS_MASKBIT) {
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292 | 531a0b82 | Michael S. Tsirkin | fprintf(stderr, " mask 0x%"PRIx32" pending 0x%"PRIx32, |
293 | 531a0b82 | Michael S. Tsirkin | pci_get_long(dev->config + msi_mask_off(dev, msi64bit)), |
294 | 531a0b82 | Michael S. Tsirkin | pci_get_long(dev->config + msi_pending_off(dev, msi64bit))); |
295 | e4c7d2ae | Isaku Yamahata | } |
296 | 531a0b82 | Michael S. Tsirkin | fprintf(stderr, "\n");
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297 | 531a0b82 | Michael S. Tsirkin | #endif
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298 | e4c7d2ae | Isaku Yamahata | |
299 | e4c7d2ae | Isaku Yamahata | if (!(flags & PCI_MSI_FLAGS_ENABLE)) {
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300 | e4c7d2ae | Isaku Yamahata | return;
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301 | e4c7d2ae | Isaku Yamahata | } |
302 | e4c7d2ae | Isaku Yamahata | |
303 | e4c7d2ae | Isaku Yamahata | /*
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304 | e4c7d2ae | Isaku Yamahata | * Now MSI is enabled, clear INTx# interrupts.
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305 | e4c7d2ae | Isaku Yamahata | * the driver is prohibited from writing enable bit to mask
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306 | e4c7d2ae | Isaku Yamahata | * a service request. But the guest OS could do this.
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307 | e4c7d2ae | Isaku Yamahata | * So we just discard the interrupts as moderate fallback.
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308 | e4c7d2ae | Isaku Yamahata | *
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309 | e4c7d2ae | Isaku Yamahata | * 6.8.3.3. Enabling Operation
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310 | e4c7d2ae | Isaku Yamahata | * While enabled for MSI or MSI-X operation, a function is prohibited
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311 | e4c7d2ae | Isaku Yamahata | * from using its INTx# pin (if implemented) to request
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312 | e4c7d2ae | Isaku Yamahata | * service (MSI, MSI-X, and INTx# are mutually exclusive).
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313 | e4c7d2ae | Isaku Yamahata | */
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314 | 59369b08 | Isaku Yamahata | pci_device_deassert_intx(dev); |
315 | e4c7d2ae | Isaku Yamahata | |
316 | e4c7d2ae | Isaku Yamahata | /*
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317 | e4c7d2ae | Isaku Yamahata | * nr_vectors might be set bigger than capable. So clamp it.
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318 | e4c7d2ae | Isaku Yamahata | * This is not legal by spec, so we can do anything we like,
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319 | e4c7d2ae | Isaku Yamahata | * just don't crash the host
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320 | e4c7d2ae | Isaku Yamahata | */
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321 | e4c7d2ae | Isaku Yamahata | log_num_vecs = |
322 | e4c7d2ae | Isaku Yamahata | (flags & PCI_MSI_FLAGS_QSIZE) >> (ffs(PCI_MSI_FLAGS_QSIZE) - 1);
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323 | e4c7d2ae | Isaku Yamahata | log_max_vecs = |
324 | e4c7d2ae | Isaku Yamahata | (flags & PCI_MSI_FLAGS_QMASK) >> (ffs(PCI_MSI_FLAGS_QMASK) - 1);
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325 | e4c7d2ae | Isaku Yamahata | if (log_num_vecs > log_max_vecs) {
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326 | e4c7d2ae | Isaku Yamahata | flags &= ~PCI_MSI_FLAGS_QSIZE; |
327 | e4c7d2ae | Isaku Yamahata | flags |= log_max_vecs << (ffs(PCI_MSI_FLAGS_QSIZE) - 1);
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328 | e4c7d2ae | Isaku Yamahata | pci_set_word(dev->config + msi_flags_off(dev), flags); |
329 | e4c7d2ae | Isaku Yamahata | } |
330 | e4c7d2ae | Isaku Yamahata | |
331 | e4c7d2ae | Isaku Yamahata | if (!msi_per_vector_mask) {
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332 | e4c7d2ae | Isaku Yamahata | /* if per vector masking isn't supported,
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333 | e4c7d2ae | Isaku Yamahata | there is no pending interrupt. */
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334 | e4c7d2ae | Isaku Yamahata | return;
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335 | e4c7d2ae | Isaku Yamahata | } |
336 | e4c7d2ae | Isaku Yamahata | |
337 | e4c7d2ae | Isaku Yamahata | nr_vectors = msi_nr_vectors(flags); |
338 | e4c7d2ae | Isaku Yamahata | |
339 | e4c7d2ae | Isaku Yamahata | /* This will discard pending interrupts, if any. */
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340 | e4c7d2ae | Isaku Yamahata | pending = pci_get_long(dev->config + msi_pending_off(dev, msi64bit)); |
341 | e4c7d2ae | Isaku Yamahata | pending &= 0xffffffff >> (PCI_MSI_VECTORS_MAX - nr_vectors);
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342 | e4c7d2ae | Isaku Yamahata | pci_set_long(dev->config + msi_pending_off(dev, msi64bit), pending); |
343 | e4c7d2ae | Isaku Yamahata | |
344 | e4c7d2ae | Isaku Yamahata | /* deliver pending interrupts which are unmasked */
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345 | e4c7d2ae | Isaku Yamahata | for (vector = 0; vector < nr_vectors; ++vector) { |
346 | e4c7d2ae | Isaku Yamahata | if (msi_is_masked(dev, vector) || !(pending & (1U << vector))) { |
347 | e4c7d2ae | Isaku Yamahata | continue;
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348 | e4c7d2ae | Isaku Yamahata | } |
349 | e4c7d2ae | Isaku Yamahata | |
350 | e4c7d2ae | Isaku Yamahata | pci_long_test_and_clear_mask( |
351 | e4c7d2ae | Isaku Yamahata | dev->config + msi_pending_off(dev, msi64bit), 1U << vector);
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352 | e4c7d2ae | Isaku Yamahata | msi_notify(dev, vector); |
353 | e4c7d2ae | Isaku Yamahata | } |
354 | e4c7d2ae | Isaku Yamahata | } |
355 | e4c7d2ae | Isaku Yamahata | |
356 | e4c7d2ae | Isaku Yamahata | unsigned int msi_nr_vectors_allocated(const PCIDevice *dev) |
357 | e4c7d2ae | Isaku Yamahata | { |
358 | e4c7d2ae | Isaku Yamahata | uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev)); |
359 | e4c7d2ae | Isaku Yamahata | return msi_nr_vectors(flags);
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360 | e4c7d2ae | Isaku Yamahata | } |