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1 | 02eb84d0 | Michael S. Tsirkin | /*
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2 | 02eb84d0 | Michael S. Tsirkin | * MSI-X device support
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3 | 02eb84d0 | Michael S. Tsirkin | *
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4 | 02eb84d0 | Michael S. Tsirkin | * This module includes support for MSI-X in pci devices.
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5 | 02eb84d0 | Michael S. Tsirkin | *
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6 | 02eb84d0 | Michael S. Tsirkin | * Author: Michael S. Tsirkin <mst@redhat.com>
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7 | 02eb84d0 | Michael S. Tsirkin | *
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8 | 02eb84d0 | Michael S. Tsirkin | * Copyright (c) 2009, Red Hat Inc, Michael S. Tsirkin (mst@redhat.com)
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9 | 02eb84d0 | Michael S. Tsirkin | *
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10 | 02eb84d0 | Michael S. Tsirkin | * This work is licensed under the terms of the GNU GPL, version 2. See
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11 | 02eb84d0 | Michael S. Tsirkin | * the COPYING file in the top-level directory.
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12 | 02eb84d0 | Michael S. Tsirkin | */
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13 | 02eb84d0 | Michael S. Tsirkin | |
14 | 02eb84d0 | Michael S. Tsirkin | #include "hw.h" |
15 | 02eb84d0 | Michael S. Tsirkin | #include "msix.h" |
16 | 02eb84d0 | Michael S. Tsirkin | #include "pci.h" |
17 | bf1b0071 | Blue Swirl | #include "range.h" |
18 | 02eb84d0 | Michael S. Tsirkin | |
19 | 02eb84d0 | Michael S. Tsirkin | #define MSIX_CAP_LENGTH 12 |
20 | 02eb84d0 | Michael S. Tsirkin | |
21 | 2760952b | Michael S. Tsirkin | /* MSI enable bit and maskall bit are in byte 1 in FLAGS register */
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22 | 2760952b | Michael S. Tsirkin | #define MSIX_CONTROL_OFFSET (PCI_MSIX_FLAGS + 1) |
23 | 02eb84d0 | Michael S. Tsirkin | #define MSIX_ENABLE_MASK (PCI_MSIX_FLAGS_ENABLE >> 8) |
24 | 5b5cb086 | Michael S. Tsirkin | #define MSIX_MASKALL_MASK (PCI_MSIX_FLAGS_MASKALL >> 8) |
25 | 02eb84d0 | Michael S. Tsirkin | |
26 | 5a1fc5e8 | Michael S. Tsirkin | /* How much space does an MSIX table need. */
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27 | 5a1fc5e8 | Michael S. Tsirkin | /* The spec requires giving the table structure
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28 | 5a1fc5e8 | Michael S. Tsirkin | * a 4K aligned region all by itself. */
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29 | 5a1fc5e8 | Michael S. Tsirkin | #define MSIX_PAGE_SIZE 0x1000 |
30 | 5a1fc5e8 | Michael S. Tsirkin | /* Reserve second half of the page for pending bits */
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31 | 5a1fc5e8 | Michael S. Tsirkin | #define MSIX_PAGE_PENDING (MSIX_PAGE_SIZE / 2) |
32 | 02eb84d0 | Michael S. Tsirkin | #define MSIX_MAX_ENTRIES 32 |
33 | 02eb84d0 | Michael S. Tsirkin | |
34 | 02eb84d0 | Michael S. Tsirkin | |
35 | 02eb84d0 | Michael S. Tsirkin | /* Flag for interrupt controller to declare MSI-X support */
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36 | 02eb84d0 | Michael S. Tsirkin | int msix_supported;
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37 | 02eb84d0 | Michael S. Tsirkin | |
38 | 02eb84d0 | Michael S. Tsirkin | /* Add MSI-X capability to the config space for the device. */
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39 | 02eb84d0 | Michael S. Tsirkin | /* Given a bar and its size, add MSI-X table on top of it
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40 | 02eb84d0 | Michael S. Tsirkin | * and fill MSI-X capability in the config space.
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41 | 02eb84d0 | Michael S. Tsirkin | * Original bar size must be a power of 2 or 0.
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42 | 02eb84d0 | Michael S. Tsirkin | * New bar size is returned. */
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43 | 02eb84d0 | Michael S. Tsirkin | static int msix_add_config(struct PCIDevice *pdev, unsigned short nentries, |
44 | 02eb84d0 | Michael S. Tsirkin | unsigned bar_nr, unsigned bar_size) |
45 | 02eb84d0 | Michael S. Tsirkin | { |
46 | 02eb84d0 | Michael S. Tsirkin | int config_offset;
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47 | 02eb84d0 | Michael S. Tsirkin | uint8_t *config; |
48 | 02eb84d0 | Michael S. Tsirkin | uint32_t new_size; |
49 | 02eb84d0 | Michael S. Tsirkin | |
50 | 02eb84d0 | Michael S. Tsirkin | if (nentries < 1 || nentries > PCI_MSIX_FLAGS_QSIZE + 1) |
51 | 02eb84d0 | Michael S. Tsirkin | return -EINVAL;
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52 | 02eb84d0 | Michael S. Tsirkin | if (bar_size > 0x80000000) |
53 | 02eb84d0 | Michael S. Tsirkin | return -ENOSPC;
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54 | 02eb84d0 | Michael S. Tsirkin | |
55 | 02eb84d0 | Michael S. Tsirkin | /* Add space for MSI-X structures */
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56 | 5e520a7d | Blue Swirl | if (!bar_size) {
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57 | 5a1fc5e8 | Michael S. Tsirkin | new_size = MSIX_PAGE_SIZE; |
58 | 5a1fc5e8 | Michael S. Tsirkin | } else if (bar_size < MSIX_PAGE_SIZE) { |
59 | 5a1fc5e8 | Michael S. Tsirkin | bar_size = MSIX_PAGE_SIZE; |
60 | 5a1fc5e8 | Michael S. Tsirkin | new_size = MSIX_PAGE_SIZE * 2;
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61 | 5a1fc5e8 | Michael S. Tsirkin | } else {
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62 | 02eb84d0 | Michael S. Tsirkin | new_size = bar_size * 2;
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63 | 5a1fc5e8 | Michael S. Tsirkin | } |
64 | 02eb84d0 | Michael S. Tsirkin | |
65 | 02eb84d0 | Michael S. Tsirkin | pdev->msix_bar_size = new_size; |
66 | ca77089d | Isaku Yamahata | config_offset = pci_add_capability(pdev, PCI_CAP_ID_MSIX, |
67 | ca77089d | Isaku Yamahata | 0, MSIX_CAP_LENGTH);
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68 | 02eb84d0 | Michael S. Tsirkin | if (config_offset < 0) |
69 | 02eb84d0 | Michael S. Tsirkin | return config_offset;
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70 | 02eb84d0 | Michael S. Tsirkin | config = pdev->config + config_offset; |
71 | 02eb84d0 | Michael S. Tsirkin | |
72 | 02eb84d0 | Michael S. Tsirkin | pci_set_word(config + PCI_MSIX_FLAGS, nentries - 1);
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73 | 02eb84d0 | Michael S. Tsirkin | /* Table on top of BAR */
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74 | 01731cfb | Jan Kiszka | pci_set_long(config + PCI_MSIX_TABLE, bar_size | bar_nr); |
75 | 02eb84d0 | Michael S. Tsirkin | /* Pending bits on top of that */
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76 | 01731cfb | Jan Kiszka | pci_set_long(config + PCI_MSIX_PBA, (bar_size + MSIX_PAGE_PENDING) | |
77 | 5a1fc5e8 | Michael S. Tsirkin | bar_nr); |
78 | 02eb84d0 | Michael S. Tsirkin | pdev->msix_cap = config_offset; |
79 | ebabb67a | Stefan Weil | /* Make flags bit writable. */
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80 | 5b5cb086 | Michael S. Tsirkin | pdev->wmask[config_offset + MSIX_CONTROL_OFFSET] |= MSIX_ENABLE_MASK | |
81 | 5b5cb086 | Michael S. Tsirkin | MSIX_MASKALL_MASK; |
82 | 50322249 | Michael S. Tsirkin | pdev->msix_function_masked = true;
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83 | 02eb84d0 | Michael S. Tsirkin | return 0; |
84 | 02eb84d0 | Michael S. Tsirkin | } |
85 | 02eb84d0 | Michael S. Tsirkin | |
86 | 95524ae8 | Avi Kivity | static uint64_t msix_mmio_read(void *opaque, target_phys_addr_t addr, |
87 | 95524ae8 | Avi Kivity | unsigned size)
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88 | 02eb84d0 | Michael S. Tsirkin | { |
89 | 02eb84d0 | Michael S. Tsirkin | PCIDevice *dev = opaque; |
90 | 76f5159d | Michael S. Tsirkin | unsigned int offset = addr & (MSIX_PAGE_SIZE - 1) & ~0x3; |
91 | 02eb84d0 | Michael S. Tsirkin | void *page = dev->msix_table_page;
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92 | 02eb84d0 | Michael S. Tsirkin | |
93 | 76f5159d | Michael S. Tsirkin | return pci_get_long(page + offset);
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94 | 02eb84d0 | Michael S. Tsirkin | } |
95 | 02eb84d0 | Michael S. Tsirkin | |
96 | 02eb84d0 | Michael S. Tsirkin | static uint8_t msix_pending_mask(int vector) |
97 | 02eb84d0 | Michael S. Tsirkin | { |
98 | 02eb84d0 | Michael S. Tsirkin | return 1 << (vector % 8); |
99 | 02eb84d0 | Michael S. Tsirkin | } |
100 | 02eb84d0 | Michael S. Tsirkin | |
101 | 02eb84d0 | Michael S. Tsirkin | static uint8_t *msix_pending_byte(PCIDevice *dev, int vector) |
102 | 02eb84d0 | Michael S. Tsirkin | { |
103 | 5a1fc5e8 | Michael S. Tsirkin | return dev->msix_table_page + MSIX_PAGE_PENDING + vector / 8; |
104 | 02eb84d0 | Michael S. Tsirkin | } |
105 | 02eb84d0 | Michael S. Tsirkin | |
106 | 02eb84d0 | Michael S. Tsirkin | static int msix_is_pending(PCIDevice *dev, int vector) |
107 | 02eb84d0 | Michael S. Tsirkin | { |
108 | 02eb84d0 | Michael S. Tsirkin | return *msix_pending_byte(dev, vector) & msix_pending_mask(vector);
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109 | 02eb84d0 | Michael S. Tsirkin | } |
110 | 02eb84d0 | Michael S. Tsirkin | |
111 | 02eb84d0 | Michael S. Tsirkin | static void msix_set_pending(PCIDevice *dev, int vector) |
112 | 02eb84d0 | Michael S. Tsirkin | { |
113 | 02eb84d0 | Michael S. Tsirkin | *msix_pending_byte(dev, vector) |= msix_pending_mask(vector); |
114 | 02eb84d0 | Michael S. Tsirkin | } |
115 | 02eb84d0 | Michael S. Tsirkin | |
116 | 02eb84d0 | Michael S. Tsirkin | static void msix_clr_pending(PCIDevice *dev, int vector) |
117 | 02eb84d0 | Michael S. Tsirkin | { |
118 | 02eb84d0 | Michael S. Tsirkin | *msix_pending_byte(dev, vector) &= ~msix_pending_mask(vector); |
119 | 02eb84d0 | Michael S. Tsirkin | } |
120 | 02eb84d0 | Michael S. Tsirkin | |
121 | ae392c41 | Michael S. Tsirkin | static bool msix_vector_masked(PCIDevice *dev, int vector, bool fmask) |
122 | 02eb84d0 | Michael S. Tsirkin | { |
123 | ae392c41 | Michael S. Tsirkin | unsigned offset = vector * PCI_MSIX_ENTRY_SIZE + PCI_MSIX_ENTRY_VECTOR_CTRL;
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124 | ae392c41 | Michael S. Tsirkin | return fmask || dev->msix_table_page[offset] & PCI_MSIX_ENTRY_CTRL_MASKBIT;
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125 | 5b5cb086 | Michael S. Tsirkin | } |
126 | 5b5cb086 | Michael S. Tsirkin | |
127 | ae392c41 | Michael S. Tsirkin | static bool msix_is_masked(PCIDevice *dev, int vector) |
128 | 5b5cb086 | Michael S. Tsirkin | { |
129 | ae392c41 | Michael S. Tsirkin | return msix_vector_masked(dev, vector, dev->msix_function_masked);
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130 | ae392c41 | Michael S. Tsirkin | } |
131 | ae392c41 | Michael S. Tsirkin | |
132 | ae392c41 | Michael S. Tsirkin | static void msix_handle_mask_update(PCIDevice *dev, int vector, bool was_masked) |
133 | ae392c41 | Michael S. Tsirkin | { |
134 | ae392c41 | Michael S. Tsirkin | bool is_masked = msix_is_masked(dev, vector);
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135 | ae392c41 | Michael S. Tsirkin | if (is_masked == was_masked) {
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136 | ae392c41 | Michael S. Tsirkin | return;
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137 | ae392c41 | Michael S. Tsirkin | } |
138 | ae392c41 | Michael S. Tsirkin | |
139 | ae392c41 | Michael S. Tsirkin | if (!is_masked && msix_is_pending(dev, vector)) {
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140 | 5b5cb086 | Michael S. Tsirkin | msix_clr_pending(dev, vector); |
141 | 5b5cb086 | Michael S. Tsirkin | msix_notify(dev, vector); |
142 | 5b5cb086 | Michael S. Tsirkin | } |
143 | 5b5cb086 | Michael S. Tsirkin | } |
144 | 5b5cb086 | Michael S. Tsirkin | |
145 | 50322249 | Michael S. Tsirkin | static void msix_update_function_masked(PCIDevice *dev) |
146 | 50322249 | Michael S. Tsirkin | { |
147 | 50322249 | Michael S. Tsirkin | dev->msix_function_masked = !msix_enabled(dev) || |
148 | 50322249 | Michael S. Tsirkin | (dev->config[dev->msix_cap + MSIX_CONTROL_OFFSET] & MSIX_MASKALL_MASK); |
149 | 50322249 | Michael S. Tsirkin | } |
150 | 50322249 | Michael S. Tsirkin | |
151 | 5b5cb086 | Michael S. Tsirkin | /* Handle MSI-X capability config write. */
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152 | 5b5cb086 | Michael S. Tsirkin | void msix_write_config(PCIDevice *dev, uint32_t addr,
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153 | 5b5cb086 | Michael S. Tsirkin | uint32_t val, int len)
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154 | 5b5cb086 | Michael S. Tsirkin | { |
155 | 5b5cb086 | Michael S. Tsirkin | unsigned enable_pos = dev->msix_cap + MSIX_CONTROL_OFFSET;
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156 | 5b5cb086 | Michael S. Tsirkin | int vector;
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157 | 50322249 | Michael S. Tsirkin | bool was_masked;
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158 | 5b5cb086 | Michael S. Tsirkin | |
159 | 98a3cb02 | Isaku Yamahata | if (!range_covers_byte(addr, len, enable_pos)) {
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160 | 5b5cb086 | Michael S. Tsirkin | return;
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161 | 5b5cb086 | Michael S. Tsirkin | } |
162 | 5b5cb086 | Michael S. Tsirkin | |
163 | 50322249 | Michael S. Tsirkin | was_masked = dev->msix_function_masked; |
164 | 50322249 | Michael S. Tsirkin | msix_update_function_masked(dev); |
165 | 50322249 | Michael S. Tsirkin | |
166 | 5b5cb086 | Michael S. Tsirkin | if (!msix_enabled(dev)) {
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167 | 5b5cb086 | Michael S. Tsirkin | return;
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168 | 5b5cb086 | Michael S. Tsirkin | } |
169 | 5b5cb086 | Michael S. Tsirkin | |
170 | e407bf13 | Isaku Yamahata | pci_device_deassert_intx(dev); |
171 | 5b5cb086 | Michael S. Tsirkin | |
172 | 50322249 | Michael S. Tsirkin | if (dev->msix_function_masked == was_masked) {
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173 | 5b5cb086 | Michael S. Tsirkin | return;
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174 | 5b5cb086 | Michael S. Tsirkin | } |
175 | 5b5cb086 | Michael S. Tsirkin | |
176 | 5b5cb086 | Michael S. Tsirkin | for (vector = 0; vector < dev->msix_entries_nr; ++vector) { |
177 | ae392c41 | Michael S. Tsirkin | msix_handle_mask_update(dev, vector, |
178 | ae392c41 | Michael S. Tsirkin | msix_vector_masked(dev, vector, was_masked)); |
179 | 5b5cb086 | Michael S. Tsirkin | } |
180 | 02eb84d0 | Michael S. Tsirkin | } |
181 | 02eb84d0 | Michael S. Tsirkin | |
182 | 95524ae8 | Avi Kivity | static void msix_mmio_write(void *opaque, target_phys_addr_t addr, |
183 | 95524ae8 | Avi Kivity | uint64_t val, unsigned size)
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184 | 02eb84d0 | Michael S. Tsirkin | { |
185 | 02eb84d0 | Michael S. Tsirkin | PCIDevice *dev = opaque; |
186 | 76f5159d | Michael S. Tsirkin | unsigned int offset = addr & (MSIX_PAGE_SIZE - 1) & ~0x3; |
187 | 01731cfb | Jan Kiszka | int vector = offset / PCI_MSIX_ENTRY_SIZE;
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188 | ae392c41 | Michael S. Tsirkin | bool was_masked;
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189 | 9a93b617 | Michael S. Tsirkin | |
190 | 9a93b617 | Michael S. Tsirkin | /* MSI-X page includes a read-only PBA and a writeable Vector Control. */
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191 | 9a93b617 | Michael S. Tsirkin | if (vector >= dev->msix_entries_nr) {
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192 | 9a93b617 | Michael S. Tsirkin | return;
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193 | 9a93b617 | Michael S. Tsirkin | } |
194 | 9a93b617 | Michael S. Tsirkin | |
195 | ae392c41 | Michael S. Tsirkin | was_masked = msix_is_masked(dev, vector); |
196 | 76f5159d | Michael S. Tsirkin | pci_set_long(dev->msix_table_page + offset, val); |
197 | ae392c41 | Michael S. Tsirkin | msix_handle_mask_update(dev, vector, was_masked); |
198 | 02eb84d0 | Michael S. Tsirkin | } |
199 | 02eb84d0 | Michael S. Tsirkin | |
200 | 95524ae8 | Avi Kivity | static const MemoryRegionOps msix_mmio_ops = { |
201 | 95524ae8 | Avi Kivity | .read = msix_mmio_read, |
202 | 95524ae8 | Avi Kivity | .write = msix_mmio_write, |
203 | 95524ae8 | Avi Kivity | .endianness = DEVICE_NATIVE_ENDIAN, |
204 | 95524ae8 | Avi Kivity | .valid = { |
205 | 95524ae8 | Avi Kivity | .min_access_size = 4,
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206 | 95524ae8 | Avi Kivity | .max_access_size = 4,
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207 | 95524ae8 | Avi Kivity | }, |
208 | 02eb84d0 | Michael S. Tsirkin | }; |
209 | 02eb84d0 | Michael S. Tsirkin | |
210 | 95524ae8 | Avi Kivity | static void msix_mmio_setup(PCIDevice *d, MemoryRegion *bar) |
211 | 02eb84d0 | Michael S. Tsirkin | { |
212 | 02eb84d0 | Michael S. Tsirkin | uint8_t *config = d->config + d->msix_cap; |
213 | 01731cfb | Jan Kiszka | uint32_t table = pci_get_long(config + PCI_MSIX_TABLE); |
214 | 5a1fc5e8 | Michael S. Tsirkin | uint32_t offset = table & ~(MSIX_PAGE_SIZE - 1);
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215 | 02eb84d0 | Michael S. Tsirkin | /* TODO: for assigned devices, we'll want to make it possible to map
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216 | 02eb84d0 | Michael S. Tsirkin | * pending bits separately in case they are in a separate bar. */
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217 | 02eb84d0 | Michael S. Tsirkin | |
218 | 95524ae8 | Avi Kivity | memory_region_add_subregion(bar, offset, &d->msix_mmio); |
219 | 02eb84d0 | Michael S. Tsirkin | } |
220 | 02eb84d0 | Michael S. Tsirkin | |
221 | ae1be0bb | Michael S. Tsirkin | static void msix_mask_all(struct PCIDevice *dev, unsigned nentries) |
222 | ae1be0bb | Michael S. Tsirkin | { |
223 | ae1be0bb | Michael S. Tsirkin | int vector;
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224 | ae1be0bb | Michael S. Tsirkin | for (vector = 0; vector < nentries; ++vector) { |
225 | 01731cfb | Jan Kiszka | unsigned offset =
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226 | 01731cfb | Jan Kiszka | vector * PCI_MSIX_ENTRY_SIZE + PCI_MSIX_ENTRY_VECTOR_CTRL; |
227 | 01731cfb | Jan Kiszka | dev->msix_table_page[offset] |= PCI_MSIX_ENTRY_CTRL_MASKBIT; |
228 | ae1be0bb | Michael S. Tsirkin | } |
229 | ae1be0bb | Michael S. Tsirkin | } |
230 | ae1be0bb | Michael S. Tsirkin | |
231 | 02eb84d0 | Michael S. Tsirkin | /* Initialize the MSI-X structures. Note: if MSI-X is supported, BAR size is
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232 | 02eb84d0 | Michael S. Tsirkin | * modified, it should be retrieved with msix_bar_size. */
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233 | 02eb84d0 | Michael S. Tsirkin | int msix_init(struct PCIDevice *dev, unsigned short nentries, |
234 | 95524ae8 | Avi Kivity | MemoryRegion *bar, |
235 | 5a1fc5e8 | Michael S. Tsirkin | unsigned bar_nr, unsigned bar_size) |
236 | 02eb84d0 | Michael S. Tsirkin | { |
237 | 02eb84d0 | Michael S. Tsirkin | int ret;
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238 | 02eb84d0 | Michael S. Tsirkin | /* Nothing to do if MSI is not supported by interrupt controller */
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239 | 02eb84d0 | Michael S. Tsirkin | if (!msix_supported)
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240 | 02eb84d0 | Michael S. Tsirkin | return -ENOTSUP;
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241 | 02eb84d0 | Michael S. Tsirkin | |
242 | 02eb84d0 | Michael S. Tsirkin | if (nentries > MSIX_MAX_ENTRIES)
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243 | 02eb84d0 | Michael S. Tsirkin | return -EINVAL;
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244 | 02eb84d0 | Michael S. Tsirkin | |
245 | 7267c094 | Anthony Liguori | dev->msix_entry_used = g_malloc0(MSIX_MAX_ENTRIES * |
246 | 02eb84d0 | Michael S. Tsirkin | sizeof *dev->msix_entry_used);
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247 | 02eb84d0 | Michael S. Tsirkin | |
248 | 7267c094 | Anthony Liguori | dev->msix_table_page = g_malloc0(MSIX_PAGE_SIZE); |
249 | ae1be0bb | Michael S. Tsirkin | msix_mask_all(dev, nentries); |
250 | 02eb84d0 | Michael S. Tsirkin | |
251 | 95524ae8 | Avi Kivity | memory_region_init_io(&dev->msix_mmio, &msix_mmio_ops, dev, |
252 | 95524ae8 | Avi Kivity | "msix", MSIX_PAGE_SIZE);
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253 | 02eb84d0 | Michael S. Tsirkin | |
254 | 02eb84d0 | Michael S. Tsirkin | dev->msix_entries_nr = nentries; |
255 | 02eb84d0 | Michael S. Tsirkin | ret = msix_add_config(dev, nentries, bar_nr, bar_size); |
256 | 02eb84d0 | Michael S. Tsirkin | if (ret)
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257 | 02eb84d0 | Michael S. Tsirkin | goto err_config;
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258 | 02eb84d0 | Michael S. Tsirkin | |
259 | 02eb84d0 | Michael S. Tsirkin | dev->cap_present |= QEMU_PCI_CAP_MSIX; |
260 | 95524ae8 | Avi Kivity | msix_mmio_setup(dev, bar); |
261 | 02eb84d0 | Michael S. Tsirkin | return 0; |
262 | 02eb84d0 | Michael S. Tsirkin | |
263 | 02eb84d0 | Michael S. Tsirkin | err_config:
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264 | 3174ecd1 | Michael S. Tsirkin | dev->msix_entries_nr = 0;
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265 | 95524ae8 | Avi Kivity | memory_region_destroy(&dev->msix_mmio); |
266 | 7267c094 | Anthony Liguori | g_free(dev->msix_table_page); |
267 | 02eb84d0 | Michael S. Tsirkin | dev->msix_table_page = NULL;
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268 | 7267c094 | Anthony Liguori | g_free(dev->msix_entry_used); |
269 | 02eb84d0 | Michael S. Tsirkin | dev->msix_entry_used = NULL;
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270 | 02eb84d0 | Michael S. Tsirkin | return ret;
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271 | 02eb84d0 | Michael S. Tsirkin | } |
272 | 02eb84d0 | Michael S. Tsirkin | |
273 | 98304c84 | Michael S. Tsirkin | static void msix_free_irq_entries(PCIDevice *dev) |
274 | 98304c84 | Michael S. Tsirkin | { |
275 | 98304c84 | Michael S. Tsirkin | int vector;
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276 | 98304c84 | Michael S. Tsirkin | |
277 | 98304c84 | Michael S. Tsirkin | for (vector = 0; vector < dev->msix_entries_nr; ++vector) { |
278 | 98304c84 | Michael S. Tsirkin | dev->msix_entry_used[vector] = 0;
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279 | 98304c84 | Michael S. Tsirkin | msix_clr_pending(dev, vector); |
280 | 98304c84 | Michael S. Tsirkin | } |
281 | 98304c84 | Michael S. Tsirkin | } |
282 | 98304c84 | Michael S. Tsirkin | |
283 | 02eb84d0 | Michael S. Tsirkin | /* Clean up resources for the device. */
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284 | 95524ae8 | Avi Kivity | int msix_uninit(PCIDevice *dev, MemoryRegion *bar)
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285 | 02eb84d0 | Michael S. Tsirkin | { |
286 | 02eb84d0 | Michael S. Tsirkin | if (!(dev->cap_present & QEMU_PCI_CAP_MSIX))
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287 | 02eb84d0 | Michael S. Tsirkin | return 0; |
288 | 02eb84d0 | Michael S. Tsirkin | pci_del_capability(dev, PCI_CAP_ID_MSIX, MSIX_CAP_LENGTH); |
289 | 02eb84d0 | Michael S. Tsirkin | dev->msix_cap = 0;
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290 | 02eb84d0 | Michael S. Tsirkin | msix_free_irq_entries(dev); |
291 | 02eb84d0 | Michael S. Tsirkin | dev->msix_entries_nr = 0;
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292 | 95524ae8 | Avi Kivity | memory_region_del_subregion(bar, &dev->msix_mmio); |
293 | 95524ae8 | Avi Kivity | memory_region_destroy(&dev->msix_mmio); |
294 | 7267c094 | Anthony Liguori | g_free(dev->msix_table_page); |
295 | 02eb84d0 | Michael S. Tsirkin | dev->msix_table_page = NULL;
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296 | 7267c094 | Anthony Liguori | g_free(dev->msix_entry_used); |
297 | 02eb84d0 | Michael S. Tsirkin | dev->msix_entry_used = NULL;
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298 | 02eb84d0 | Michael S. Tsirkin | dev->cap_present &= ~QEMU_PCI_CAP_MSIX; |
299 | 02eb84d0 | Michael S. Tsirkin | return 0; |
300 | 02eb84d0 | Michael S. Tsirkin | } |
301 | 02eb84d0 | Michael S. Tsirkin | |
302 | 02eb84d0 | Michael S. Tsirkin | void msix_save(PCIDevice *dev, QEMUFile *f)
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303 | 02eb84d0 | Michael S. Tsirkin | { |
304 | 9a3e12c8 | Michael S. Tsirkin | unsigned n = dev->msix_entries_nr;
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305 | 9a3e12c8 | Michael S. Tsirkin | |
306 | 72755a70 | Michael S. Tsirkin | if (!(dev->cap_present & QEMU_PCI_CAP_MSIX)) {
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307 | 9a3e12c8 | Michael S. Tsirkin | return;
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308 | 72755a70 | Michael S. Tsirkin | } |
309 | 9a3e12c8 | Michael S. Tsirkin | |
310 | 01731cfb | Jan Kiszka | qemu_put_buffer(f, dev->msix_table_page, n * PCI_MSIX_ENTRY_SIZE); |
311 | 5a1fc5e8 | Michael S. Tsirkin | qemu_put_buffer(f, dev->msix_table_page + MSIX_PAGE_PENDING, (n + 7) / 8); |
312 | 02eb84d0 | Michael S. Tsirkin | } |
313 | 02eb84d0 | Michael S. Tsirkin | |
314 | 02eb84d0 | Michael S. Tsirkin | /* Should be called after restoring the config space. */
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315 | 02eb84d0 | Michael S. Tsirkin | void msix_load(PCIDevice *dev, QEMUFile *f)
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316 | 02eb84d0 | Michael S. Tsirkin | { |
317 | 02eb84d0 | Michael S. Tsirkin | unsigned n = dev->msix_entries_nr;
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318 | 02eb84d0 | Michael S. Tsirkin | |
319 | 98846d73 | Blue Swirl | if (!(dev->cap_present & QEMU_PCI_CAP_MSIX)) {
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320 | 02eb84d0 | Michael S. Tsirkin | return;
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321 | 98846d73 | Blue Swirl | } |
322 | 02eb84d0 | Michael S. Tsirkin | |
323 | 4bfd1712 | Michael S. Tsirkin | msix_free_irq_entries(dev); |
324 | 01731cfb | Jan Kiszka | qemu_get_buffer(f, dev->msix_table_page, n * PCI_MSIX_ENTRY_SIZE); |
325 | 5a1fc5e8 | Michael S. Tsirkin | qemu_get_buffer(f, dev->msix_table_page + MSIX_PAGE_PENDING, (n + 7) / 8); |
326 | 50322249 | Michael S. Tsirkin | msix_update_function_masked(dev); |
327 | 02eb84d0 | Michael S. Tsirkin | } |
328 | 02eb84d0 | Michael S. Tsirkin | |
329 | 02eb84d0 | Michael S. Tsirkin | /* Does device support MSI-X? */
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330 | 02eb84d0 | Michael S. Tsirkin | int msix_present(PCIDevice *dev)
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331 | 02eb84d0 | Michael S. Tsirkin | { |
332 | 02eb84d0 | Michael S. Tsirkin | return dev->cap_present & QEMU_PCI_CAP_MSIX;
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333 | 02eb84d0 | Michael S. Tsirkin | } |
334 | 02eb84d0 | Michael S. Tsirkin | |
335 | 02eb84d0 | Michael S. Tsirkin | /* Is MSI-X enabled? */
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336 | 02eb84d0 | Michael S. Tsirkin | int msix_enabled(PCIDevice *dev)
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337 | 02eb84d0 | Michael S. Tsirkin | { |
338 | 02eb84d0 | Michael S. Tsirkin | return (dev->cap_present & QEMU_PCI_CAP_MSIX) &&
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339 | 2760952b | Michael S. Tsirkin | (dev->config[dev->msix_cap + MSIX_CONTROL_OFFSET] & |
340 | 02eb84d0 | Michael S. Tsirkin | MSIX_ENABLE_MASK); |
341 | 02eb84d0 | Michael S. Tsirkin | } |
342 | 02eb84d0 | Michael S. Tsirkin | |
343 | 02eb84d0 | Michael S. Tsirkin | /* Size of bar where MSI-X table resides, or 0 if MSI-X not supported. */
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344 | 02eb84d0 | Michael S. Tsirkin | uint32_t msix_bar_size(PCIDevice *dev) |
345 | 02eb84d0 | Michael S. Tsirkin | { |
346 | 02eb84d0 | Michael S. Tsirkin | return (dev->cap_present & QEMU_PCI_CAP_MSIX) ?
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347 | 02eb84d0 | Michael S. Tsirkin | dev->msix_bar_size : 0;
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348 | 02eb84d0 | Michael S. Tsirkin | } |
349 | 02eb84d0 | Michael S. Tsirkin | |
350 | 02eb84d0 | Michael S. Tsirkin | /* Send an MSI-X message */
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351 | 02eb84d0 | Michael S. Tsirkin | void msix_notify(PCIDevice *dev, unsigned vector) |
352 | 02eb84d0 | Michael S. Tsirkin | { |
353 | 01731cfb | Jan Kiszka | uint8_t *table_entry = dev->msix_table_page + vector * PCI_MSIX_ENTRY_SIZE; |
354 | 02eb84d0 | Michael S. Tsirkin | uint64_t address; |
355 | 02eb84d0 | Michael S. Tsirkin | uint32_t data; |
356 | 02eb84d0 | Michael S. Tsirkin | |
357 | 02eb84d0 | Michael S. Tsirkin | if (vector >= dev->msix_entries_nr || !dev->msix_entry_used[vector])
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358 | 02eb84d0 | Michael S. Tsirkin | return;
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359 | 02eb84d0 | Michael S. Tsirkin | if (msix_is_masked(dev, vector)) {
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360 | 02eb84d0 | Michael S. Tsirkin | msix_set_pending(dev, vector); |
361 | 02eb84d0 | Michael S. Tsirkin | return;
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362 | 02eb84d0 | Michael S. Tsirkin | } |
363 | 02eb84d0 | Michael S. Tsirkin | |
364 | 01731cfb | Jan Kiszka | address = pci_get_quad(table_entry + PCI_MSIX_ENTRY_LOWER_ADDR); |
365 | 01731cfb | Jan Kiszka | data = pci_get_long(table_entry + PCI_MSIX_ENTRY_DATA); |
366 | ae5d3eb4 | Alexander Graf | stl_le_phys(address, data); |
367 | 02eb84d0 | Michael S. Tsirkin | } |
368 | 02eb84d0 | Michael S. Tsirkin | |
369 | 02eb84d0 | Michael S. Tsirkin | void msix_reset(PCIDevice *dev)
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370 | 02eb84d0 | Michael S. Tsirkin | { |
371 | 02eb84d0 | Michael S. Tsirkin | if (!(dev->cap_present & QEMU_PCI_CAP_MSIX))
|
372 | 02eb84d0 | Michael S. Tsirkin | return;
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373 | 02eb84d0 | Michael S. Tsirkin | msix_free_irq_entries(dev); |
374 | 2760952b | Michael S. Tsirkin | dev->config[dev->msix_cap + MSIX_CONTROL_OFFSET] &= |
375 | 2760952b | Michael S. Tsirkin | ~dev->wmask[dev->msix_cap + MSIX_CONTROL_OFFSET]; |
376 | 5a1fc5e8 | Michael S. Tsirkin | memset(dev->msix_table_page, 0, MSIX_PAGE_SIZE);
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377 | ae1be0bb | Michael S. Tsirkin | msix_mask_all(dev, dev->msix_entries_nr); |
378 | 02eb84d0 | Michael S. Tsirkin | } |
379 | 02eb84d0 | Michael S. Tsirkin | |
380 | 02eb84d0 | Michael S. Tsirkin | /* PCI spec suggests that devices make it possible for software to configure
|
381 | 02eb84d0 | Michael S. Tsirkin | * less vectors than supported by the device, but does not specify a standard
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382 | 02eb84d0 | Michael S. Tsirkin | * mechanism for devices to do so.
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383 | 02eb84d0 | Michael S. Tsirkin | *
|
384 | 02eb84d0 | Michael S. Tsirkin | * We support this by asking devices to declare vectors software is going to
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385 | 02eb84d0 | Michael S. Tsirkin | * actually use, and checking this on the notification path. Devices that
|
386 | 02eb84d0 | Michael S. Tsirkin | * don't want to follow the spec suggestion can declare all vectors as used. */
|
387 | 02eb84d0 | Michael S. Tsirkin | |
388 | 02eb84d0 | Michael S. Tsirkin | /* Mark vector as used. */
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389 | 02eb84d0 | Michael S. Tsirkin | int msix_vector_use(PCIDevice *dev, unsigned vector) |
390 | 02eb84d0 | Michael S. Tsirkin | { |
391 | 02eb84d0 | Michael S. Tsirkin | if (vector >= dev->msix_entries_nr)
|
392 | 02eb84d0 | Michael S. Tsirkin | return -EINVAL;
|
393 | 02eb84d0 | Michael S. Tsirkin | dev->msix_entry_used[vector]++; |
394 | 02eb84d0 | Michael S. Tsirkin | return 0; |
395 | 02eb84d0 | Michael S. Tsirkin | } |
396 | 02eb84d0 | Michael S. Tsirkin | |
397 | 02eb84d0 | Michael S. Tsirkin | /* Mark vector as unused. */
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398 | 02eb84d0 | Michael S. Tsirkin | void msix_vector_unuse(PCIDevice *dev, unsigned vector) |
399 | 02eb84d0 | Michael S. Tsirkin | { |
400 | 98304c84 | Michael S. Tsirkin | if (vector >= dev->msix_entries_nr || !dev->msix_entry_used[vector]) {
|
401 | 98304c84 | Michael S. Tsirkin | return;
|
402 | 98304c84 | Michael S. Tsirkin | } |
403 | 98304c84 | Michael S. Tsirkin | if (--dev->msix_entry_used[vector]) {
|
404 | 98304c84 | Michael S. Tsirkin | return;
|
405 | 98304c84 | Michael S. Tsirkin | } |
406 | 98304c84 | Michael S. Tsirkin | msix_clr_pending(dev, vector); |
407 | 02eb84d0 | Michael S. Tsirkin | } |
408 | b5f28bca | Michael S. Tsirkin | |
409 | b5f28bca | Michael S. Tsirkin | void msix_unuse_all_vectors(PCIDevice *dev)
|
410 | b5f28bca | Michael S. Tsirkin | { |
411 | b5f28bca | Michael S. Tsirkin | if (!(dev->cap_present & QEMU_PCI_CAP_MSIX))
|
412 | b5f28bca | Michael S. Tsirkin | return;
|
413 | b5f28bca | Michael S. Tsirkin | msix_free_irq_entries(dev); |
414 | b5f28bca | Michael S. Tsirkin | } |