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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 | 02eb84d0 | Michael S. Tsirkin | |
18 | 02eb84d0 | Michael S. Tsirkin | /* Declaration from linux/pci_regs.h */
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19 | 02eb84d0 | Michael S. Tsirkin | #define PCI_CAP_ID_MSIX 0x11 /* MSI-X */ |
20 | 02eb84d0 | Michael S. Tsirkin | #define PCI_MSIX_FLAGS 2 /* Table at lower 11 bits */ |
21 | 02eb84d0 | Michael S. Tsirkin | #define PCI_MSIX_FLAGS_QSIZE 0x7FF |
22 | 02eb84d0 | Michael S. Tsirkin | #define PCI_MSIX_FLAGS_ENABLE (1 << 15) |
23 | 5b5cb086 | Michael S. Tsirkin | #define PCI_MSIX_FLAGS_MASKALL (1 << 14) |
24 | 02eb84d0 | Michael S. Tsirkin | #define PCI_MSIX_FLAGS_BIRMASK (7 << 0) |
25 | 02eb84d0 | Michael S. Tsirkin | |
26 | 02eb84d0 | Michael S. Tsirkin | /* MSI-X capability structure */
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27 | 02eb84d0 | Michael S. Tsirkin | #define MSIX_TABLE_OFFSET 4 |
28 | 02eb84d0 | Michael S. Tsirkin | #define MSIX_PBA_OFFSET 8 |
29 | 02eb84d0 | Michael S. Tsirkin | #define MSIX_CAP_LENGTH 12 |
30 | 02eb84d0 | Michael S. Tsirkin | |
31 | 2760952b | Michael S. Tsirkin | /* MSI enable bit and maskall bit are in byte 1 in FLAGS register */
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32 | 2760952b | Michael S. Tsirkin | #define MSIX_CONTROL_OFFSET (PCI_MSIX_FLAGS + 1) |
33 | 02eb84d0 | Michael S. Tsirkin | #define MSIX_ENABLE_MASK (PCI_MSIX_FLAGS_ENABLE >> 8) |
34 | 5b5cb086 | Michael S. Tsirkin | #define MSIX_MASKALL_MASK (PCI_MSIX_FLAGS_MASKALL >> 8) |
35 | 02eb84d0 | Michael S. Tsirkin | |
36 | 02eb84d0 | Michael S. Tsirkin | /* MSI-X table format */
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37 | 02eb84d0 | Michael S. Tsirkin | #define MSIX_MSG_ADDR 0 |
38 | 02eb84d0 | Michael S. Tsirkin | #define MSIX_MSG_UPPER_ADDR 4 |
39 | 02eb84d0 | Michael S. Tsirkin | #define MSIX_MSG_DATA 8 |
40 | 02eb84d0 | Michael S. Tsirkin | #define MSIX_VECTOR_CTRL 12 |
41 | 02eb84d0 | Michael S. Tsirkin | #define MSIX_ENTRY_SIZE 16 |
42 | 02eb84d0 | Michael S. Tsirkin | #define MSIX_VECTOR_MASK 0x1 |
43 | 5a1fc5e8 | Michael S. Tsirkin | |
44 | 5a1fc5e8 | Michael S. Tsirkin | /* How much space does an MSIX table need. */
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45 | 5a1fc5e8 | Michael S. Tsirkin | /* The spec requires giving the table structure
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46 | 5a1fc5e8 | Michael S. Tsirkin | * a 4K aligned region all by itself. */
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47 | 5a1fc5e8 | Michael S. Tsirkin | #define MSIX_PAGE_SIZE 0x1000 |
48 | 5a1fc5e8 | Michael S. Tsirkin | /* Reserve second half of the page for pending bits */
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49 | 5a1fc5e8 | Michael S. Tsirkin | #define MSIX_PAGE_PENDING (MSIX_PAGE_SIZE / 2) |
50 | 02eb84d0 | Michael S. Tsirkin | #define MSIX_MAX_ENTRIES 32 |
51 | 02eb84d0 | Michael S. Tsirkin | |
52 | 02eb84d0 | Michael S. Tsirkin | |
53 | 02eb84d0 | Michael S. Tsirkin | #ifdef MSIX_DEBUG
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54 | 02eb84d0 | Michael S. Tsirkin | #define DEBUG(fmt, ...) \
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55 | 02eb84d0 | Michael S. Tsirkin | do { \
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56 | 02eb84d0 | Michael S. Tsirkin | fprintf(stderr, "%s: " fmt, __func__ , __VA_ARGS__); \
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57 | 02eb84d0 | Michael S. Tsirkin | } while (0) |
58 | 02eb84d0 | Michael S. Tsirkin | #else
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59 | 02eb84d0 | Michael S. Tsirkin | #define DEBUG(fmt, ...) do { } while(0) |
60 | 02eb84d0 | Michael S. Tsirkin | #endif
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61 | 02eb84d0 | Michael S. Tsirkin | |
62 | 02eb84d0 | Michael S. Tsirkin | /* Flag for interrupt controller to declare MSI-X support */
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63 | 02eb84d0 | Michael S. Tsirkin | int msix_supported;
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64 | 02eb84d0 | Michael S. Tsirkin | |
65 | 02eb84d0 | Michael S. Tsirkin | /* Add MSI-X capability to the config space for the device. */
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66 | 02eb84d0 | Michael S. Tsirkin | /* Given a bar and its size, add MSI-X table on top of it
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67 | 02eb84d0 | Michael S. Tsirkin | * and fill MSI-X capability in the config space.
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68 | 02eb84d0 | Michael S. Tsirkin | * Original bar size must be a power of 2 or 0.
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69 | 02eb84d0 | Michael S. Tsirkin | * New bar size is returned. */
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70 | 02eb84d0 | Michael S. Tsirkin | static int msix_add_config(struct PCIDevice *pdev, unsigned short nentries, |
71 | 02eb84d0 | Michael S. Tsirkin | unsigned bar_nr, unsigned bar_size) |
72 | 02eb84d0 | Michael S. Tsirkin | { |
73 | 02eb84d0 | Michael S. Tsirkin | int config_offset;
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74 | 02eb84d0 | Michael S. Tsirkin | uint8_t *config; |
75 | 02eb84d0 | Michael S. Tsirkin | uint32_t new_size; |
76 | 02eb84d0 | Michael S. Tsirkin | |
77 | 02eb84d0 | Michael S. Tsirkin | if (nentries < 1 || nentries > PCI_MSIX_FLAGS_QSIZE + 1) |
78 | 02eb84d0 | Michael S. Tsirkin | return -EINVAL;
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79 | 02eb84d0 | Michael S. Tsirkin | if (bar_size > 0x80000000) |
80 | 02eb84d0 | Michael S. Tsirkin | return -ENOSPC;
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81 | 02eb84d0 | Michael S. Tsirkin | |
82 | 02eb84d0 | Michael S. Tsirkin | /* Add space for MSI-X structures */
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83 | 5e520a7d | Blue Swirl | if (!bar_size) {
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84 | 5a1fc5e8 | Michael S. Tsirkin | new_size = MSIX_PAGE_SIZE; |
85 | 5a1fc5e8 | Michael S. Tsirkin | } else if (bar_size < MSIX_PAGE_SIZE) { |
86 | 5a1fc5e8 | Michael S. Tsirkin | bar_size = MSIX_PAGE_SIZE; |
87 | 5a1fc5e8 | Michael S. Tsirkin | new_size = MSIX_PAGE_SIZE * 2;
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88 | 5a1fc5e8 | Michael S. Tsirkin | } else {
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89 | 02eb84d0 | Michael S. Tsirkin | new_size = bar_size * 2;
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90 | 5a1fc5e8 | Michael S. Tsirkin | } |
91 | 02eb84d0 | Michael S. Tsirkin | |
92 | 02eb84d0 | Michael S. Tsirkin | pdev->msix_bar_size = new_size; |
93 | 02eb84d0 | Michael S. Tsirkin | config_offset = pci_add_capability(pdev, PCI_CAP_ID_MSIX, MSIX_CAP_LENGTH); |
94 | 02eb84d0 | Michael S. Tsirkin | if (config_offset < 0) |
95 | 02eb84d0 | Michael S. Tsirkin | return config_offset;
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96 | 02eb84d0 | Michael S. Tsirkin | config = pdev->config + config_offset; |
97 | 02eb84d0 | Michael S. Tsirkin | |
98 | 02eb84d0 | Michael S. Tsirkin | pci_set_word(config + PCI_MSIX_FLAGS, nentries - 1);
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99 | 02eb84d0 | Michael S. Tsirkin | /* Table on top of BAR */
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100 | 02eb84d0 | Michael S. Tsirkin | pci_set_long(config + MSIX_TABLE_OFFSET, bar_size | bar_nr); |
101 | 02eb84d0 | Michael S. Tsirkin | /* Pending bits on top of that */
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102 | 5a1fc5e8 | Michael S. Tsirkin | pci_set_long(config + MSIX_PBA_OFFSET, (bar_size + MSIX_PAGE_PENDING) | |
103 | 5a1fc5e8 | Michael S. Tsirkin | bar_nr); |
104 | 02eb84d0 | Michael S. Tsirkin | pdev->msix_cap = config_offset; |
105 | 02eb84d0 | Michael S. Tsirkin | /* Make flags bit writeable. */
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106 | 5b5cb086 | Michael S. Tsirkin | pdev->wmask[config_offset + MSIX_CONTROL_OFFSET] |= MSIX_ENABLE_MASK | |
107 | 5b5cb086 | Michael S. Tsirkin | MSIX_MASKALL_MASK; |
108 | 02eb84d0 | Michael S. Tsirkin | return 0; |
109 | 02eb84d0 | Michael S. Tsirkin | } |
110 | 02eb84d0 | Michael S. Tsirkin | |
111 | c227f099 | Anthony Liguori | static uint32_t msix_mmio_readl(void *opaque, target_phys_addr_t addr) |
112 | 02eb84d0 | Michael S. Tsirkin | { |
113 | 02eb84d0 | Michael S. Tsirkin | PCIDevice *dev = opaque; |
114 | 76f5159d | Michael S. Tsirkin | unsigned int offset = addr & (MSIX_PAGE_SIZE - 1) & ~0x3; |
115 | 02eb84d0 | Michael S. Tsirkin | void *page = dev->msix_table_page;
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116 | 02eb84d0 | Michael S. Tsirkin | |
117 | 76f5159d | Michael S. Tsirkin | return pci_get_long(page + offset);
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118 | 02eb84d0 | Michael S. Tsirkin | } |
119 | 02eb84d0 | Michael S. Tsirkin | |
120 | c227f099 | Anthony Liguori | static uint32_t msix_mmio_read_unallowed(void *opaque, target_phys_addr_t addr) |
121 | 02eb84d0 | Michael S. Tsirkin | { |
122 | 02eb84d0 | Michael S. Tsirkin | fprintf(stderr, "MSI-X: only dword read is allowed!\n");
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123 | 02eb84d0 | Michael S. Tsirkin | return 0; |
124 | 02eb84d0 | Michael S. Tsirkin | } |
125 | 02eb84d0 | Michael S. Tsirkin | |
126 | 02eb84d0 | Michael S. Tsirkin | static uint8_t msix_pending_mask(int vector) |
127 | 02eb84d0 | Michael S. Tsirkin | { |
128 | 02eb84d0 | Michael S. Tsirkin | return 1 << (vector % 8); |
129 | 02eb84d0 | Michael S. Tsirkin | } |
130 | 02eb84d0 | Michael S. Tsirkin | |
131 | 02eb84d0 | Michael S. Tsirkin | static uint8_t *msix_pending_byte(PCIDevice *dev, int vector) |
132 | 02eb84d0 | Michael S. Tsirkin | { |
133 | 5a1fc5e8 | Michael S. Tsirkin | return dev->msix_table_page + MSIX_PAGE_PENDING + vector / 8; |
134 | 02eb84d0 | Michael S. Tsirkin | } |
135 | 02eb84d0 | Michael S. Tsirkin | |
136 | 02eb84d0 | Michael S. Tsirkin | static int msix_is_pending(PCIDevice *dev, int vector) |
137 | 02eb84d0 | Michael S. Tsirkin | { |
138 | 02eb84d0 | Michael S. Tsirkin | return *msix_pending_byte(dev, vector) & msix_pending_mask(vector);
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139 | 02eb84d0 | Michael S. Tsirkin | } |
140 | 02eb84d0 | Michael S. Tsirkin | |
141 | 02eb84d0 | Michael S. Tsirkin | static void msix_set_pending(PCIDevice *dev, int vector) |
142 | 02eb84d0 | Michael S. Tsirkin | { |
143 | 02eb84d0 | Michael S. Tsirkin | *msix_pending_byte(dev, vector) |= msix_pending_mask(vector); |
144 | 02eb84d0 | Michael S. Tsirkin | } |
145 | 02eb84d0 | Michael S. Tsirkin | |
146 | 02eb84d0 | Michael S. Tsirkin | static void msix_clr_pending(PCIDevice *dev, int vector) |
147 | 02eb84d0 | Michael S. Tsirkin | { |
148 | 02eb84d0 | Michael S. Tsirkin | *msix_pending_byte(dev, vector) &= ~msix_pending_mask(vector); |
149 | 02eb84d0 | Michael S. Tsirkin | } |
150 | 02eb84d0 | Michael S. Tsirkin | |
151 | 5b5cb086 | Michael S. Tsirkin | static int msix_function_masked(PCIDevice *dev) |
152 | 5b5cb086 | Michael S. Tsirkin | { |
153 | 5b5cb086 | Michael S. Tsirkin | return dev->config[dev->msix_cap + MSIX_CONTROL_OFFSET] & MSIX_MASKALL_MASK;
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154 | 5b5cb086 | Michael S. Tsirkin | } |
155 | 5b5cb086 | Michael S. Tsirkin | |
156 | 02eb84d0 | Michael S. Tsirkin | static int msix_is_masked(PCIDevice *dev, int vector) |
157 | 02eb84d0 | Michael S. Tsirkin | { |
158 | 02eb84d0 | Michael S. Tsirkin | unsigned offset = vector * MSIX_ENTRY_SIZE + MSIX_VECTOR_CTRL;
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159 | 5b5cb086 | Michael S. Tsirkin | return msix_function_masked(dev) ||
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160 | 5b5cb086 | Michael S. Tsirkin | dev->msix_table_page[offset] & MSIX_VECTOR_MASK; |
161 | 5b5cb086 | Michael S. Tsirkin | } |
162 | 5b5cb086 | Michael S. Tsirkin | |
163 | 5b5cb086 | Michael S. Tsirkin | static void msix_handle_mask_update(PCIDevice *dev, int vector) |
164 | 5b5cb086 | Michael S. Tsirkin | { |
165 | 5b5cb086 | Michael S. Tsirkin | if (!msix_is_masked(dev, vector) && msix_is_pending(dev, vector)) {
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166 | 5b5cb086 | Michael S. Tsirkin | msix_clr_pending(dev, vector); |
167 | 5b5cb086 | Michael S. Tsirkin | msix_notify(dev, vector); |
168 | 5b5cb086 | Michael S. Tsirkin | } |
169 | 5b5cb086 | Michael S. Tsirkin | } |
170 | 5b5cb086 | Michael S. Tsirkin | |
171 | 5b5cb086 | Michael S. Tsirkin | /* Handle MSI-X capability config write. */
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172 | 5b5cb086 | Michael S. Tsirkin | void msix_write_config(PCIDevice *dev, uint32_t addr,
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173 | 5b5cb086 | Michael S. Tsirkin | uint32_t val, int len)
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174 | 5b5cb086 | Michael S. Tsirkin | { |
175 | 5b5cb086 | Michael S. Tsirkin | unsigned enable_pos = dev->msix_cap + MSIX_CONTROL_OFFSET;
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176 | 5b5cb086 | Michael S. Tsirkin | int vector;
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177 | 5b5cb086 | Michael S. Tsirkin | |
178 | 5b5cb086 | Michael S. Tsirkin | if (addr + len <= enable_pos || addr > enable_pos) {
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179 | 5b5cb086 | Michael S. Tsirkin | return;
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180 | 5b5cb086 | Michael S. Tsirkin | } |
181 | 5b5cb086 | Michael S. Tsirkin | |
182 | 5b5cb086 | Michael S. Tsirkin | if (!msix_enabled(dev)) {
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183 | 5b5cb086 | Michael S. Tsirkin | return;
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184 | 5b5cb086 | Michael S. Tsirkin | } |
185 | 5b5cb086 | Michael S. Tsirkin | |
186 | 5b5cb086 | Michael S. Tsirkin | qemu_set_irq(dev->irq[0], 0); |
187 | 5b5cb086 | Michael S. Tsirkin | |
188 | 5b5cb086 | Michael S. Tsirkin | if (msix_function_masked(dev)) {
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189 | 5b5cb086 | Michael S. Tsirkin | return;
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190 | 5b5cb086 | Michael S. Tsirkin | } |
191 | 5b5cb086 | Michael S. Tsirkin | |
192 | 5b5cb086 | Michael S. Tsirkin | for (vector = 0; vector < dev->msix_entries_nr; ++vector) { |
193 | 5b5cb086 | Michael S. Tsirkin | msix_handle_mask_update(dev, vector); |
194 | 5b5cb086 | Michael S. Tsirkin | } |
195 | 02eb84d0 | Michael S. Tsirkin | } |
196 | 02eb84d0 | Michael S. Tsirkin | |
197 | c227f099 | Anthony Liguori | static void msix_mmio_writel(void *opaque, target_phys_addr_t addr, |
198 | 02eb84d0 | Michael S. Tsirkin | uint32_t val) |
199 | 02eb84d0 | Michael S. Tsirkin | { |
200 | 02eb84d0 | Michael S. Tsirkin | PCIDevice *dev = opaque; |
201 | 76f5159d | Michael S. Tsirkin | unsigned int offset = addr & (MSIX_PAGE_SIZE - 1) & ~0x3; |
202 | 02eb84d0 | Michael S. Tsirkin | int vector = offset / MSIX_ENTRY_SIZE;
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203 | 76f5159d | Michael S. Tsirkin | pci_set_long(dev->msix_table_page + offset, val); |
204 | 5b5cb086 | Michael S. Tsirkin | msix_handle_mask_update(dev, vector); |
205 | 02eb84d0 | Michael S. Tsirkin | } |
206 | 02eb84d0 | Michael S. Tsirkin | |
207 | c227f099 | Anthony Liguori | static void msix_mmio_write_unallowed(void *opaque, target_phys_addr_t addr, |
208 | 02eb84d0 | Michael S. Tsirkin | uint32_t val) |
209 | 02eb84d0 | Michael S. Tsirkin | { |
210 | 02eb84d0 | Michael S. Tsirkin | fprintf(stderr, "MSI-X: only dword write is allowed!\n");
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211 | 02eb84d0 | Michael S. Tsirkin | } |
212 | 02eb84d0 | Michael S. Tsirkin | |
213 | d60efc6b | Blue Swirl | static CPUWriteMemoryFunc * const msix_mmio_write[] = { |
214 | 02eb84d0 | Michael S. Tsirkin | msix_mmio_write_unallowed, msix_mmio_write_unallowed, msix_mmio_writel |
215 | 02eb84d0 | Michael S. Tsirkin | }; |
216 | 02eb84d0 | Michael S. Tsirkin | |
217 | d60efc6b | Blue Swirl | static CPUReadMemoryFunc * const msix_mmio_read[] = { |
218 | 02eb84d0 | Michael S. Tsirkin | msix_mmio_read_unallowed, msix_mmio_read_unallowed, msix_mmio_readl |
219 | 02eb84d0 | Michael S. Tsirkin | }; |
220 | 02eb84d0 | Michael S. Tsirkin | |
221 | 02eb84d0 | Michael S. Tsirkin | /* Should be called from device's map method. */
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222 | 02eb84d0 | Michael S. Tsirkin | void msix_mmio_map(PCIDevice *d, int region_num, |
223 | 6e355d90 | Isaku Yamahata | pcibus_t addr, pcibus_t size, int type)
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224 | 02eb84d0 | Michael S. Tsirkin | { |
225 | 02eb84d0 | Michael S. Tsirkin | uint8_t *config = d->config + d->msix_cap; |
226 | 02eb84d0 | Michael S. Tsirkin | uint32_t table = pci_get_long(config + MSIX_TABLE_OFFSET); |
227 | 5a1fc5e8 | Michael S. Tsirkin | uint32_t offset = table & ~(MSIX_PAGE_SIZE - 1);
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228 | 02eb84d0 | Michael S. Tsirkin | /* TODO: for assigned devices, we'll want to make it possible to map
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229 | 02eb84d0 | Michael S. Tsirkin | * pending bits separately in case they are in a separate bar. */
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230 | 02eb84d0 | Michael S. Tsirkin | int table_bir = table & PCI_MSIX_FLAGS_BIRMASK;
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231 | 02eb84d0 | Michael S. Tsirkin | |
232 | 02eb84d0 | Michael S. Tsirkin | if (table_bir != region_num)
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233 | 02eb84d0 | Michael S. Tsirkin | return;
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234 | 02eb84d0 | Michael S. Tsirkin | if (size <= offset)
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235 | 02eb84d0 | Michael S. Tsirkin | return;
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236 | 02eb84d0 | Michael S. Tsirkin | cpu_register_physical_memory(addr + offset, size - offset, |
237 | 02eb84d0 | Michael S. Tsirkin | d->msix_mmio_index); |
238 | 02eb84d0 | Michael S. Tsirkin | } |
239 | 02eb84d0 | Michael S. Tsirkin | |
240 | ae1be0bb | Michael S. Tsirkin | static void msix_mask_all(struct PCIDevice *dev, unsigned nentries) |
241 | ae1be0bb | Michael S. Tsirkin | { |
242 | ae1be0bb | Michael S. Tsirkin | int vector;
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243 | ae1be0bb | Michael S. Tsirkin | for (vector = 0; vector < nentries; ++vector) { |
244 | ae1be0bb | Michael S. Tsirkin | unsigned offset = vector * MSIX_ENTRY_SIZE + MSIX_VECTOR_CTRL;
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245 | ae1be0bb | Michael S. Tsirkin | dev->msix_table_page[offset] |= MSIX_VECTOR_MASK; |
246 | ae1be0bb | Michael S. Tsirkin | } |
247 | ae1be0bb | Michael S. Tsirkin | } |
248 | ae1be0bb | Michael S. Tsirkin | |
249 | 02eb84d0 | Michael S. Tsirkin | /* Initialize the MSI-X structures. Note: if MSI-X is supported, BAR size is
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250 | 02eb84d0 | Michael S. Tsirkin | * modified, it should be retrieved with msix_bar_size. */
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251 | 02eb84d0 | Michael S. Tsirkin | int msix_init(struct PCIDevice *dev, unsigned short nentries, |
252 | 5a1fc5e8 | Michael S. Tsirkin | unsigned bar_nr, unsigned bar_size) |
253 | 02eb84d0 | Michael S. Tsirkin | { |
254 | 02eb84d0 | Michael S. Tsirkin | int ret;
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255 | 02eb84d0 | Michael S. Tsirkin | /* Nothing to do if MSI is not supported by interrupt controller */
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256 | 02eb84d0 | Michael S. Tsirkin | if (!msix_supported)
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257 | 02eb84d0 | Michael S. Tsirkin | return -ENOTSUP;
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258 | 02eb84d0 | Michael S. Tsirkin | |
259 | 02eb84d0 | Michael S. Tsirkin | if (nentries > MSIX_MAX_ENTRIES)
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260 | 02eb84d0 | Michael S. Tsirkin | return -EINVAL;
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261 | 02eb84d0 | Michael S. Tsirkin | |
262 | 02eb84d0 | Michael S. Tsirkin | dev->msix_entry_used = qemu_mallocz(MSIX_MAX_ENTRIES * |
263 | 02eb84d0 | Michael S. Tsirkin | sizeof *dev->msix_entry_used);
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264 | 02eb84d0 | Michael S. Tsirkin | |
265 | 5a1fc5e8 | Michael S. Tsirkin | dev->msix_table_page = qemu_mallocz(MSIX_PAGE_SIZE); |
266 | ae1be0bb | Michael S. Tsirkin | msix_mask_all(dev, nentries); |
267 | 02eb84d0 | Michael S. Tsirkin | |
268 | 02eb84d0 | Michael S. Tsirkin | dev->msix_mmio_index = cpu_register_io_memory(msix_mmio_read, |
269 | 02eb84d0 | Michael S. Tsirkin | msix_mmio_write, dev); |
270 | 02eb84d0 | Michael S. Tsirkin | if (dev->msix_mmio_index == -1) { |
271 | 02eb84d0 | Michael S. Tsirkin | ret = -EBUSY; |
272 | 02eb84d0 | Michael S. Tsirkin | goto err_index;
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273 | 02eb84d0 | Michael S. Tsirkin | } |
274 | 02eb84d0 | Michael S. Tsirkin | |
275 | 02eb84d0 | Michael S. Tsirkin | dev->msix_entries_nr = nentries; |
276 | 02eb84d0 | Michael S. Tsirkin | ret = msix_add_config(dev, nentries, bar_nr, bar_size); |
277 | 02eb84d0 | Michael S. Tsirkin | if (ret)
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278 | 02eb84d0 | Michael S. Tsirkin | goto err_config;
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279 | 02eb84d0 | Michael S. Tsirkin | |
280 | 02eb84d0 | Michael S. Tsirkin | dev->cap_present |= QEMU_PCI_CAP_MSIX; |
281 | 02eb84d0 | Michael S. Tsirkin | return 0; |
282 | 02eb84d0 | Michael S. Tsirkin | |
283 | 02eb84d0 | Michael S. Tsirkin | err_config:
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284 | 3174ecd1 | Michael S. Tsirkin | dev->msix_entries_nr = 0;
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285 | 02eb84d0 | Michael S. Tsirkin | cpu_unregister_io_memory(dev->msix_mmio_index); |
286 | 02eb84d0 | Michael S. Tsirkin | err_index:
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287 | 02eb84d0 | Michael S. Tsirkin | qemu_free(dev->msix_table_page); |
288 | 02eb84d0 | Michael S. Tsirkin | dev->msix_table_page = NULL;
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289 | 02eb84d0 | Michael S. Tsirkin | qemu_free(dev->msix_entry_used); |
290 | 02eb84d0 | Michael S. Tsirkin | dev->msix_entry_used = NULL;
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291 | 02eb84d0 | Michael S. Tsirkin | return ret;
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292 | 02eb84d0 | Michael S. Tsirkin | } |
293 | 02eb84d0 | Michael S. Tsirkin | |
294 | 98304c84 | Michael S. Tsirkin | static void msix_free_irq_entries(PCIDevice *dev) |
295 | 98304c84 | Michael S. Tsirkin | { |
296 | 98304c84 | Michael S. Tsirkin | int vector;
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297 | 98304c84 | Michael S. Tsirkin | |
298 | 98304c84 | Michael S. Tsirkin | for (vector = 0; vector < dev->msix_entries_nr; ++vector) { |
299 | 98304c84 | Michael S. Tsirkin | dev->msix_entry_used[vector] = 0;
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300 | 98304c84 | Michael S. Tsirkin | msix_clr_pending(dev, vector); |
301 | 98304c84 | Michael S. Tsirkin | } |
302 | 98304c84 | Michael S. Tsirkin | } |
303 | 98304c84 | Michael S. Tsirkin | |
304 | 02eb84d0 | Michael S. Tsirkin | /* Clean up resources for the device. */
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305 | 02eb84d0 | Michael S. Tsirkin | int msix_uninit(PCIDevice *dev)
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306 | 02eb84d0 | Michael S. Tsirkin | { |
307 | 02eb84d0 | Michael S. Tsirkin | if (!(dev->cap_present & QEMU_PCI_CAP_MSIX))
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308 | 02eb84d0 | Michael S. Tsirkin | return 0; |
309 | 02eb84d0 | Michael S. Tsirkin | pci_del_capability(dev, PCI_CAP_ID_MSIX, MSIX_CAP_LENGTH); |
310 | 02eb84d0 | Michael S. Tsirkin | dev->msix_cap = 0;
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311 | 02eb84d0 | Michael S. Tsirkin | msix_free_irq_entries(dev); |
312 | 02eb84d0 | Michael S. Tsirkin | dev->msix_entries_nr = 0;
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313 | 02eb84d0 | Michael S. Tsirkin | cpu_unregister_io_memory(dev->msix_mmio_index); |
314 | 02eb84d0 | Michael S. Tsirkin | qemu_free(dev->msix_table_page); |
315 | 02eb84d0 | Michael S. Tsirkin | dev->msix_table_page = NULL;
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316 | 02eb84d0 | Michael S. Tsirkin | qemu_free(dev->msix_entry_used); |
317 | 02eb84d0 | Michael S. Tsirkin | dev->msix_entry_used = NULL;
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318 | 02eb84d0 | Michael S. Tsirkin | dev->cap_present &= ~QEMU_PCI_CAP_MSIX; |
319 | 02eb84d0 | Michael S. Tsirkin | return 0; |
320 | 02eb84d0 | Michael S. Tsirkin | } |
321 | 02eb84d0 | Michael S. Tsirkin | |
322 | 02eb84d0 | Michael S. Tsirkin | void msix_save(PCIDevice *dev, QEMUFile *f)
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323 | 02eb84d0 | Michael S. Tsirkin | { |
324 | 9a3e12c8 | Michael S. Tsirkin | unsigned n = dev->msix_entries_nr;
|
325 | 9a3e12c8 | Michael S. Tsirkin | |
326 | 72755a70 | Michael S. Tsirkin | if (!(dev->cap_present & QEMU_PCI_CAP_MSIX)) {
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327 | 9a3e12c8 | Michael S. Tsirkin | return;
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328 | 72755a70 | Michael S. Tsirkin | } |
329 | 9a3e12c8 | Michael S. Tsirkin | |
330 | 9a3e12c8 | Michael S. Tsirkin | qemu_put_buffer(f, dev->msix_table_page, n * MSIX_ENTRY_SIZE); |
331 | 5a1fc5e8 | Michael S. Tsirkin | qemu_put_buffer(f, dev->msix_table_page + MSIX_PAGE_PENDING, (n + 7) / 8); |
332 | 02eb84d0 | Michael S. Tsirkin | } |
333 | 02eb84d0 | Michael S. Tsirkin | |
334 | 02eb84d0 | Michael S. Tsirkin | /* Should be called after restoring the config space. */
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335 | 02eb84d0 | Michael S. Tsirkin | void msix_load(PCIDevice *dev, QEMUFile *f)
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336 | 02eb84d0 | Michael S. Tsirkin | { |
337 | 02eb84d0 | Michael S. Tsirkin | unsigned n = dev->msix_entries_nr;
|
338 | 02eb84d0 | Michael S. Tsirkin | |
339 | 98846d73 | Blue Swirl | if (!(dev->cap_present & QEMU_PCI_CAP_MSIX)) {
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340 | 02eb84d0 | Michael S. Tsirkin | return;
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341 | 98846d73 | Blue Swirl | } |
342 | 02eb84d0 | Michael S. Tsirkin | |
343 | 4bfd1712 | Michael S. Tsirkin | msix_free_irq_entries(dev); |
344 | 02eb84d0 | Michael S. Tsirkin | qemu_get_buffer(f, dev->msix_table_page, n * MSIX_ENTRY_SIZE); |
345 | 5a1fc5e8 | Michael S. Tsirkin | qemu_get_buffer(f, dev->msix_table_page + MSIX_PAGE_PENDING, (n + 7) / 8); |
346 | 02eb84d0 | Michael S. Tsirkin | } |
347 | 02eb84d0 | Michael S. Tsirkin | |
348 | 02eb84d0 | Michael S. Tsirkin | /* Does device support MSI-X? */
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349 | 02eb84d0 | Michael S. Tsirkin | int msix_present(PCIDevice *dev)
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350 | 02eb84d0 | Michael S. Tsirkin | { |
351 | 02eb84d0 | Michael S. Tsirkin | return dev->cap_present & QEMU_PCI_CAP_MSIX;
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352 | 02eb84d0 | Michael S. Tsirkin | } |
353 | 02eb84d0 | Michael S. Tsirkin | |
354 | 02eb84d0 | Michael S. Tsirkin | /* Is MSI-X enabled? */
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355 | 02eb84d0 | Michael S. Tsirkin | int msix_enabled(PCIDevice *dev)
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356 | 02eb84d0 | Michael S. Tsirkin | { |
357 | 02eb84d0 | Michael S. Tsirkin | return (dev->cap_present & QEMU_PCI_CAP_MSIX) &&
|
358 | 2760952b | Michael S. Tsirkin | (dev->config[dev->msix_cap + MSIX_CONTROL_OFFSET] & |
359 | 02eb84d0 | Michael S. Tsirkin | MSIX_ENABLE_MASK); |
360 | 02eb84d0 | Michael S. Tsirkin | } |
361 | 02eb84d0 | Michael S. Tsirkin | |
362 | 02eb84d0 | Michael S. Tsirkin | /* Size of bar where MSI-X table resides, or 0 if MSI-X not supported. */
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363 | 02eb84d0 | Michael S. Tsirkin | uint32_t msix_bar_size(PCIDevice *dev) |
364 | 02eb84d0 | Michael S. Tsirkin | { |
365 | 02eb84d0 | Michael S. Tsirkin | return (dev->cap_present & QEMU_PCI_CAP_MSIX) ?
|
366 | 02eb84d0 | Michael S. Tsirkin | dev->msix_bar_size : 0;
|
367 | 02eb84d0 | Michael S. Tsirkin | } |
368 | 02eb84d0 | Michael S. Tsirkin | |
369 | 02eb84d0 | Michael S. Tsirkin | /* Send an MSI-X message */
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370 | 02eb84d0 | Michael S. Tsirkin | void msix_notify(PCIDevice *dev, unsigned vector) |
371 | 02eb84d0 | Michael S. Tsirkin | { |
372 | 02eb84d0 | Michael S. Tsirkin | uint8_t *table_entry = dev->msix_table_page + vector * MSIX_ENTRY_SIZE; |
373 | 02eb84d0 | Michael S. Tsirkin | uint64_t address; |
374 | 02eb84d0 | Michael S. Tsirkin | uint32_t data; |
375 | 02eb84d0 | Michael S. Tsirkin | |
376 | 02eb84d0 | Michael S. Tsirkin | if (vector >= dev->msix_entries_nr || !dev->msix_entry_used[vector])
|
377 | 02eb84d0 | Michael S. Tsirkin | return;
|
378 | 02eb84d0 | Michael S. Tsirkin | if (msix_is_masked(dev, vector)) {
|
379 | 02eb84d0 | Michael S. Tsirkin | msix_set_pending(dev, vector); |
380 | 02eb84d0 | Michael S. Tsirkin | return;
|
381 | 02eb84d0 | Michael S. Tsirkin | } |
382 | 02eb84d0 | Michael S. Tsirkin | |
383 | 02eb84d0 | Michael S. Tsirkin | address = pci_get_long(table_entry + MSIX_MSG_UPPER_ADDR); |
384 | 02eb84d0 | Michael S. Tsirkin | address = (address << 32) | pci_get_long(table_entry + MSIX_MSG_ADDR);
|
385 | 02eb84d0 | Michael S. Tsirkin | data = pci_get_long(table_entry + MSIX_MSG_DATA); |
386 | 02eb84d0 | Michael S. Tsirkin | stl_phys(address, data); |
387 | 02eb84d0 | Michael S. Tsirkin | } |
388 | 02eb84d0 | Michael S. Tsirkin | |
389 | 02eb84d0 | Michael S. Tsirkin | void msix_reset(PCIDevice *dev)
|
390 | 02eb84d0 | Michael S. Tsirkin | { |
391 | 02eb84d0 | Michael S. Tsirkin | if (!(dev->cap_present & QEMU_PCI_CAP_MSIX))
|
392 | 02eb84d0 | Michael S. Tsirkin | return;
|
393 | 02eb84d0 | Michael S. Tsirkin | msix_free_irq_entries(dev); |
394 | 2760952b | Michael S. Tsirkin | dev->config[dev->msix_cap + MSIX_CONTROL_OFFSET] &= |
395 | 2760952b | Michael S. Tsirkin | ~dev->wmask[dev->msix_cap + MSIX_CONTROL_OFFSET]; |
396 | 5a1fc5e8 | Michael S. Tsirkin | memset(dev->msix_table_page, 0, MSIX_PAGE_SIZE);
|
397 | ae1be0bb | Michael S. Tsirkin | msix_mask_all(dev, dev->msix_entries_nr); |
398 | 02eb84d0 | Michael S. Tsirkin | } |
399 | 02eb84d0 | Michael S. Tsirkin | |
400 | 02eb84d0 | Michael S. Tsirkin | /* PCI spec suggests that devices make it possible for software to configure
|
401 | 02eb84d0 | Michael S. Tsirkin | * less vectors than supported by the device, but does not specify a standard
|
402 | 02eb84d0 | Michael S. Tsirkin | * mechanism for devices to do so.
|
403 | 02eb84d0 | Michael S. Tsirkin | *
|
404 | 02eb84d0 | Michael S. Tsirkin | * We support this by asking devices to declare vectors software is going to
|
405 | 02eb84d0 | Michael S. Tsirkin | * actually use, and checking this on the notification path. Devices that
|
406 | 02eb84d0 | Michael S. Tsirkin | * don't want to follow the spec suggestion can declare all vectors as used. */
|
407 | 02eb84d0 | Michael S. Tsirkin | |
408 | 02eb84d0 | Michael S. Tsirkin | /* Mark vector as used. */
|
409 | 02eb84d0 | Michael S. Tsirkin | int msix_vector_use(PCIDevice *dev, unsigned vector) |
410 | 02eb84d0 | Michael S. Tsirkin | { |
411 | 02eb84d0 | Michael S. Tsirkin | if (vector >= dev->msix_entries_nr)
|
412 | 02eb84d0 | Michael S. Tsirkin | return -EINVAL;
|
413 | 02eb84d0 | Michael S. Tsirkin | dev->msix_entry_used[vector]++; |
414 | 02eb84d0 | Michael S. Tsirkin | return 0; |
415 | 02eb84d0 | Michael S. Tsirkin | } |
416 | 02eb84d0 | Michael S. Tsirkin | |
417 | 02eb84d0 | Michael S. Tsirkin | /* Mark vector as unused. */
|
418 | 02eb84d0 | Michael S. Tsirkin | void msix_vector_unuse(PCIDevice *dev, unsigned vector) |
419 | 02eb84d0 | Michael S. Tsirkin | { |
420 | 98304c84 | Michael S. Tsirkin | if (vector >= dev->msix_entries_nr || !dev->msix_entry_used[vector]) {
|
421 | 98304c84 | Michael S. Tsirkin | return;
|
422 | 98304c84 | Michael S. Tsirkin | } |
423 | 98304c84 | Michael S. Tsirkin | if (--dev->msix_entry_used[vector]) {
|
424 | 98304c84 | Michael S. Tsirkin | return;
|
425 | 98304c84 | Michael S. Tsirkin | } |
426 | 98304c84 | Michael S. Tsirkin | msix_clr_pending(dev, vector); |
427 | 02eb84d0 | Michael S. Tsirkin | } |
428 | b5f28bca | Michael S. Tsirkin | |
429 | b5f28bca | Michael S. Tsirkin | void msix_unuse_all_vectors(PCIDevice *dev)
|
430 | b5f28bca | Michael S. Tsirkin | { |
431 | b5f28bca | Michael S. Tsirkin | if (!(dev->cap_present & QEMU_PCI_CAP_MSIX))
|
432 | b5f28bca | Michael S. Tsirkin | return;
|
433 | b5f28bca | Michael S. Tsirkin | msix_free_irq_entries(dev); |
434 | b5f28bca | Michael S. Tsirkin | } |