tests/libqos/pci.c

   1 /*
   2  * libqos PCI bindings
   3  *
   4  * Copyright IBM, Corp. 2012-2013
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12
  13 #include "libqos/pci.h"
  14
  15 #include "hw/pci/pci_regs.h"
  16 #include <glib.h>
  17
  18 void qpci_device_foreach(QPCIBus *bus, int vendor_id, int device_id,
  19                          void (*func)(QPCIDevice *dev, int devfn, void *data),
  20                          void *data)
  21 {
  22     int slot;
  23
  24     for (slot = 0; slot < 32; slot++) {
  25         int fn;
  26
  27         for (fn = 0; fn < 8; fn++) {
  28             QPCIDevice *dev;
  29
  30             dev = qpci_device_find(bus, QPCI_DEVFN(slot, fn));
  31             if (!dev) {
  32                 continue;
  33             }
  34
  35             if (vendor_id != -1 &&
  36                 qpci_config_readw(dev, PCI_VENDOR_ID) != vendor_id) {
  37                 g_free(dev);
  38                 continue;
  39             }
  40
  41             if (device_id != -1 &&
  42                 qpci_config_readw(dev, PCI_DEVICE_ID) != device_id) {
  43                 g_free(dev);
  44                 continue;
  45             }
  46
  47             func(dev, QPCI_DEVFN(slot, fn), data);
  48         }
  49     }
  50 }
  51
  52 QPCIDevice *qpci_device_find(QPCIBus *bus, int devfn)
  53 {
  54     QPCIDevice *dev;
  55
  56     dev = g_malloc0(sizeof(*dev));
  57     dev->bus = bus;
  58     dev->devfn = devfn;
  59
  60     if (qpci_config_readw(dev, PCI_VENDOR_ID) == 0xFFFF) {
  61         g_free(dev);
  62         return NULL;
  63     }
  64
  65     return dev;
  66 }
  67
  68 void qpci_device_enable(QPCIDevice *dev)
  69 {
  70     uint16_t cmd;
  71
  72     /* FIXME -- does this need to be a bus callout? */
  73     cmd = qpci_config_readw(dev, PCI_COMMAND);
  74     cmd |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
  75     qpci_config_writew(dev, PCI_COMMAND, cmd);
  76
  77     /* Verify the bits are now set. */
  78     cmd = qpci_config_readw(dev, PCI_COMMAND);
  79     g_assert_cmphex(cmd & PCI_COMMAND_IO, ==, PCI_COMMAND_IO);
  80     g_assert_cmphex(cmd & PCI_COMMAND_MEMORY, ==, PCI_COMMAND_MEMORY);
  81     g_assert_cmphex(cmd & PCI_COMMAND_MASTER, ==, PCI_COMMAND_MASTER);
  82 }
  83
  84 uint8_t qpci_find_capability(QPCIDevice *dev, uint8_t id)
  85 {
  86     uint8_t cap;
  87     uint8_t addr = qpci_config_readb(dev, PCI_CAPABILITY_LIST);
  88
  89     do {
  90         cap = qpci_config_readb(dev, addr);
  91         if (cap != id) {
  92             addr = qpci_config_readb(dev, addr + PCI_CAP_LIST_NEXT);
  93         }
  94     } while (cap != id && addr != 0);
  95
  96     return addr;
  97 }
  98
  99 void qpci_msix_enable(QPCIDevice *dev)
 100 {
 101     uint8_t addr;
 102     uint16_t val;
 103     uint32_t table;
 104     uint8_t bir_table;
 105     uint8_t bir_pba;
 106     void *offset;
 107
 108     addr = qpci_find_capability(dev, PCI_CAP_ID_MSIX);
 109     g_assert_cmphex(addr, !=, 0);
 110
 111     val = qpci_config_readw(dev, addr + PCI_MSIX_FLAGS);
 112     qpci_config_writew(dev, addr + PCI_MSIX_FLAGS, val | PCI_MSIX_FLAGS_ENABLE);
 113
 114     table = qpci_config_readl(dev, addr + PCI_MSIX_TABLE);
 115     bir_table = table & PCI_MSIX_FLAGS_BIRMASK;
 116     offset = qpci_iomap(dev, bir_table, NULL);
 117     dev->msix_table = offset + (table & ~PCI_MSIX_FLAGS_BIRMASK);
 118
 119     table = qpci_config_readl(dev, addr + PCI_MSIX_PBA);
 120     bir_pba = table & PCI_MSIX_FLAGS_BIRMASK;
 121     if (bir_pba != bir_table) {
 122         offset = qpci_iomap(dev, bir_pba, NULL);
 123     }
 124     dev->msix_pba = offset + (table & ~PCI_MSIX_FLAGS_BIRMASK);
 125
 126     g_assert(dev->msix_table != NULL);
 127     g_assert(dev->msix_pba != NULL);
 128     dev->msix_enabled = true;
 129 }
 130
 131 void qpci_msix_disable(QPCIDevice *dev)
 132 {
 133     uint8_t addr;
 134     uint16_t val;
 135
 136     g_assert(dev->msix_enabled);
 137     addr = qpci_find_capability(dev, PCI_CAP_ID_MSIX);
 138     g_assert_cmphex(addr, !=, 0);
 139     val = qpci_config_readw(dev, addr + PCI_MSIX_FLAGS);
 140     qpci_config_writew(dev, addr + PCI_MSIX_FLAGS,
 141                                                 val & ~PCI_MSIX_FLAGS_ENABLE);
 142
 143     qpci_iounmap(dev, dev->msix_table);
 144     qpci_iounmap(dev, dev->msix_pba);
 145     dev->msix_enabled = 0;
 146     dev->msix_table = NULL;
 147     dev->msix_pba = NULL;
 148 }
 149
 150 bool qpci_msix_pending(QPCIDevice *dev, uint16_t entry)
 151 {
 152     uint32_t pba_entry;
 153     uint8_t bit_n = entry % 32;
 154     void *addr = dev->msix_pba + (entry / 32) * PCI_MSIX_ENTRY_SIZE / 4;
 155
 156     g_assert(dev->msix_enabled);
 157     pba_entry = qpci_io_readl(dev, addr);
 158     qpci_io_writel(dev, addr, pba_entry & ~(1 << bit_n));
 159     return (pba_entry & (1 << bit_n)) != 0;
 160 }
 161
 162 bool qpci_msix_masked(QPCIDevice *dev, uint16_t entry)
 163 {
 164     uint8_t addr;
 165     uint16_t val;
 166     void *vector_addr = dev->msix_table + (entry * PCI_MSIX_ENTRY_SIZE);
 167
 168     g_assert(dev->msix_enabled);
 169     addr = qpci_find_capability(dev, PCI_CAP_ID_MSIX);
 170     g_assert_cmphex(addr, !=, 0);
 171     val = qpci_config_readw(dev, addr + PCI_MSIX_FLAGS);
 172
 173     if (val & PCI_MSIX_FLAGS_MASKALL) {
 174         return true;
 175     } else {
 176         return (qpci_io_readl(dev, vector_addr + PCI_MSIX_ENTRY_VECTOR_CTRL)
 177                                             & PCI_MSIX_ENTRY_CTRL_MASKBIT) != 0;
 178     }
 179 }
 180
 181 uint16_t qpci_msix_table_size(QPCIDevice *dev)
 182 {
 183     uint8_t addr;
 184     uint16_t control;
 185
 186     addr = qpci_find_capability(dev, PCI_CAP_ID_MSIX);
 187     g_assert_cmphex(addr, !=, 0);
 188
 189     control = qpci_config_readw(dev, addr + PCI_MSIX_FLAGS);
 190     return (control & PCI_MSIX_FLAGS_QSIZE) + 1;
 191 }
 192
 193 uint8_t qpci_config_readb(QPCIDevice *dev, uint8_t offset)
 194 {
 195     return dev->bus->config_readb(dev->bus, dev->devfn, offset);
 196 }
 197
 198 uint16_t qpci_config_readw(QPCIDevice *dev, uint8_t offset)
 199 {
 200     return dev->bus->config_readw(dev->bus, dev->devfn, offset);
 201 }
 202
 203 uint32_t qpci_config_readl(QPCIDevice *dev, uint8_t offset)
 204 {
 205     return dev->bus->config_readl(dev->bus, dev->devfn, offset);
 206 }
 207
 208
 209 void qpci_config_writeb(QPCIDevice *dev, uint8_t offset, uint8_t value)
 210 {
 211     dev->bus->config_writeb(dev->bus, dev->devfn, offset, value);
 212 }
 213
 214 void qpci_config_writew(QPCIDevice *dev, uint8_t offset, uint16_t value)
 215 {
 216     dev->bus->config_writew(dev->bus, dev->devfn, offset, value);
 217 }
 218
 219 void qpci_config_writel(QPCIDevice *dev, uint8_t offset, uint32_t value)
 220 {
 221     dev->bus->config_writel(dev->bus, dev->devfn, offset, value);
 222 }
 223
 224
 225 uint8_t qpci_io_readb(QPCIDevice *dev, void *data)
 226 {
 227     return dev->bus->io_readb(dev->bus, data);
 228 }
 229
 230 uint16_t qpci_io_readw(QPCIDevice *dev, void *data)
 231 {
 232     return dev->bus->io_readw(dev->bus, data);
 233 }
 234
 235 uint32_t qpci_io_readl(QPCIDevice *dev, void *data)
 236 {
 237     return dev->bus->io_readl(dev->bus, data);
 238 }
 239
 240
 241 void qpci_io_writeb(QPCIDevice *dev, void *data, uint8_t value)
 242 {
 243     dev->bus->io_writeb(dev->bus, data, value);
 244 }
 245
 246 void qpci_io_writew(QPCIDevice *dev, void *data, uint16_t value)
 247 {
 248     dev->bus->io_writew(dev->bus, data, value);
 249 }
 250
 251 void qpci_io_writel(QPCIDevice *dev, void *data, uint32_t value)
 252 {
 253     dev->bus->io_writel(dev->bus, data, value);
 254 }
 255
 256 void *qpci_iomap(QPCIDevice *dev, int barno, uint64_t *sizeptr)
 257 {
 258     return dev->bus->iomap(dev->bus, dev, barno, sizeptr);
 259 }
 260
 261 void qpci_iounmap(QPCIDevice *dev, void *data)
 262 {
 263     dev->bus->iounmap(dev->bus, data);
 264 }
 265
 266