hw/spapr_pci.c

   1 /*
   2  * QEMU sPAPR PCI host originated from Uninorth PCI host
   3  *
   4  * Copyright (c) 2011 Alexey Kardashevskiy, IBM Corporation.
   5  * Copyright (C) 2011 David Gibson, IBM Corporation.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25 #include "hw.h"
  26 #include "pci.h"
  27 #include "pci_host.h"
  28 #include "hw/spapr.h"
  29 #include "hw/spapr_pci.h"
  30 #include "exec-memory.h"
  31 #include <libfdt.h>
  32
  33 #include "hw/pci_internals.h"
  34
  35 static PCIDevice *find_dev(sPAPREnvironment *spapr,
  36                            uint64_t buid, uint32_t config_addr)
  37 {
  38     DeviceState *qdev;
  39     int devfn = (config_addr >> 8) & 0xFF;
  40     sPAPRPHBState *phb;
  41
  42     QLIST_FOREACH(phb, &spapr->phbs, list) {
  43         if (phb->buid != buid) {
  44             continue;
  45         }
  46
  47         QTAILQ_FOREACH(qdev, &phb->host_state.bus->qbus.children, sibling) {
  48             PCIDevice *dev = (PCIDevice *)qdev;
  49             if (dev->devfn == devfn) {
  50                 return dev;
  51             }
  52         }
  53     }
  54
  55     return NULL;
  56 }
  57
  58 static uint32_t rtas_pci_cfgaddr(uint32_t arg)
  59 {
  60     return ((arg >> 20) & 0xf00) | (arg & 0xff);
  61 }
  62
  63 static uint32_t rtas_read_pci_config_do(PCIDevice *pci_dev, uint32_t addr,
  64                                         uint32_t limit, uint32_t len)
  65 {
  66     if ((addr + len) <= limit) {
  67         return pci_host_config_read_common(pci_dev, addr, limit, len);
  68     } else {
  69         return ~0x0;
  70     }
  71 }
  72
  73 static void rtas_write_pci_config_do(PCIDevice *pci_dev, uint32_t addr,
  74                                      uint32_t limit, uint32_t val,
  75                                      uint32_t len)
  76 {
  77     if ((addr + len) <= limit) {
  78         pci_host_config_write_common(pci_dev, addr, limit, val, len);
  79     }
  80 }
  81
  82 static void rtas_ibm_read_pci_config(sPAPREnvironment *spapr,
  83                                      uint32_t token, uint32_t nargs,
  84                                      target_ulong args,
  85                                      uint32_t nret, target_ulong rets)
  86 {
  87     uint32_t val, size, addr;
  88     uint64_t buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
  89     PCIDevice *dev = find_dev(spapr, buid, rtas_ld(args, 0));
  90
  91     if (!dev) {
  92         rtas_st(rets, 0, -1);
  93         return;
  94     }
  95     size = rtas_ld(args, 3);
  96     addr = rtas_pci_cfgaddr(rtas_ld(args, 0));
  97     val = rtas_read_pci_config_do(dev, addr, pci_config_size(dev), size);
  98     rtas_st(rets, 0, 0);
  99     rtas_st(rets, 1, val);
 100 }
 101
 102 static void rtas_read_pci_config(sPAPREnvironment *spapr,
 103                                  uint32_t token, uint32_t nargs,
 104                                  target_ulong args,
 105                                  uint32_t nret, target_ulong rets)
 106 {
 107     uint32_t val, size, addr;
 108     PCIDevice *dev = find_dev(spapr, 0, rtas_ld(args, 0));
 109
 110     if (!dev) {
 111         rtas_st(rets, 0, -1);
 112         return;
 113     }
 114     size = rtas_ld(args, 1);
 115     addr = rtas_pci_cfgaddr(rtas_ld(args, 0));
 116     val = rtas_read_pci_config_do(dev, addr, pci_config_size(dev), size);
 117     rtas_st(rets, 0, 0);
 118     rtas_st(rets, 1, val);
 119 }
 120
 121 static void rtas_ibm_write_pci_config(sPAPREnvironment *spapr,
 122                                       uint32_t token, uint32_t nargs,
 123                                       target_ulong args,
 124                                       uint32_t nret, target_ulong rets)
 125 {
 126     uint32_t val, size, addr;
 127     uint64_t buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
 128     PCIDevice *dev = find_dev(spapr, buid, rtas_ld(args, 0));
 129
 130     if (!dev) {
 131         rtas_st(rets, 0, -1);
 132         return;
 133     }
 134     val = rtas_ld(args, 4);
 135     size = rtas_ld(args, 3);
 136     addr = rtas_pci_cfgaddr(rtas_ld(args, 0));
 137     rtas_write_pci_config_do(dev, addr, pci_config_size(dev), val, size);
 138     rtas_st(rets, 0, 0);
 139 }
 140
 141 static void rtas_write_pci_config(sPAPREnvironment *spapr,
 142                                   uint32_t token, uint32_t nargs,
 143                                   target_ulong args,
 144                                   uint32_t nret, target_ulong rets)
 145 {
 146     uint32_t val, size, addr;
 147     PCIDevice *dev = find_dev(spapr, 0, rtas_ld(args, 0));
 148
 149     if (!dev) {
 150         rtas_st(rets, 0, -1);
 151         return;
 152     }
 153     val = rtas_ld(args, 2);
 154     size = rtas_ld(args, 1);
 155     addr = rtas_pci_cfgaddr(rtas_ld(args, 0));
 156     rtas_write_pci_config_do(dev, addr, pci_config_size(dev), val, size);
 157     rtas_st(rets, 0, 0);
 158 }
 159
 160 static int pci_spapr_map_irq(PCIDevice *pci_dev, int irq_num)
 161 {
 162     /*
 163      * Here we need to convert pci_dev + irq_num to some unique value
 164      * which is less than number of IRQs on the specific bus (now it
 165      * is 16).  At the moment irq_num == device_id (number of the
 166      * slot?)
 167      * FIXME: we should swizzle in fn and irq_num
 168      */
 169     return (pci_dev->devfn >> 3) % SPAPR_PCI_NUM_LSI;
 170 }
 171
 172 static void pci_spapr_set_irq(void *opaque, int irq_num, int level)
 173 {
 174     /*
 175      * Here we use the number returned by pci_spapr_map_irq to find a
 176      * corresponding qemu_irq.
 177      */
 178     sPAPRPHBState *phb = opaque;
 179
 180     qemu_set_irq(phb->lsi_table[irq_num].qirq, level);
 181 }
 182
 183 static int spapr_phb_init(SysBusDevice *s)
 184 {
 185     sPAPRPHBState *phb = FROM_SYSBUS(sPAPRPHBState, s);
 186     int i;
 187
 188     /* Initialize the LSI table */
 189     for (i = 0; i < SPAPR_PCI_NUM_LSI; i++) {
 190         qemu_irq qirq;
 191         uint32_t num;
 192
 193         qirq = spapr_allocate_irq(0, &num);
 194         if (!qirq) {
 195             return -1;
 196         }
 197
 198         phb->lsi_table[i].dt_irq = num;
 199         phb->lsi_table[i].qirq = qirq;
 200     }
 201
 202     return 0;
 203 }
 204
 205 static void spapr_phb_class_init(ObjectClass *klass, void *data)
 206 {
 207     SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
 208
 209     sdc->init = spapr_phb_init;
 210 }
 211
 212 static TypeInfo spapr_phb_info = {
 213     .name          = "spapr-pci-host-bridge",
 214     .parent        = TYPE_SYS_BUS_DEVICE,
 215     .instance_size = sizeof(sPAPRPHBState),
 216     .class_init    = spapr_phb_class_init,
 217 };
 218
 219 static void spapr_register_types(void)
 220 {
 221     type_register_static(&spapr_phb_info);
 222 }
 223
 224 type_init(spapr_register_types)
 225
 226 static uint64_t spapr_io_read(void *opaque, target_phys_addr_t addr,
 227                               unsigned size)
 228 {
 229     switch (size) {
 230     case 1:
 231         return cpu_inb(addr);
 232     case 2:
 233         return cpu_inw(addr);
 234     case 4:
 235         return cpu_inl(addr);
 236     }
 237     assert(0);
 238 }
 239
 240 static void spapr_io_write(void *opaque, target_phys_addr_t addr,
 241                            uint64_t data, unsigned size)
 242 {
 243     switch (size) {
 244     case 1:
 245         cpu_outb(addr, data);
 246         return;
 247     case 2:
 248         cpu_outw(addr, data);
 249         return;
 250     case 4:
 251         cpu_outl(addr, data);
 252         return;
 253     }
 254     assert(0);
 255 }
 256
 257 static const MemoryRegionOps spapr_io_ops = {
 258     .endianness = DEVICE_LITTLE_ENDIAN,
 259     .read = spapr_io_read,
 260     .write = spapr_io_write
 261 };
 262
 263 void spapr_create_phb(sPAPREnvironment *spapr,
 264                       const char *busname, uint64_t buid,
 265                       uint64_t mem_win_addr, uint64_t mem_win_size,
 266                       uint64_t io_win_addr)
 267 {
 268     DeviceState *dev;
 269     SysBusDevice *s;
 270     sPAPRPHBState *phb;
 271     PCIBus *bus;
 272     char namebuf[strlen(busname)+11];
 273
 274     dev = qdev_create(NULL, "spapr-pci-host-bridge");
 275     qdev_init_nofail(dev);
 276     s = sysbus_from_qdev(dev);
 277     phb = FROM_SYSBUS(sPAPRPHBState, s);
 278
 279     phb->mem_win_addr = mem_win_addr;
 280
 281     sprintf(namebuf, "%s-mem", busname);
 282     memory_region_init(&phb->memspace, namebuf, INT64_MAX);
 283
 284     sprintf(namebuf, "%s-memwindow", busname);
 285     memory_region_init_alias(&phb->memwindow, namebuf, &phb->memspace,
 286                              SPAPR_PCI_MEM_WIN_BUS_OFFSET, mem_win_size);
 287     memory_region_add_subregion(get_system_memory(), mem_win_addr,
 288                                 &phb->memwindow);
 289
 290     phb->io_win_addr = io_win_addr;
 291
 292     /* On ppc, we only have MMIO no specific IO space from the CPU
 293      * perspective.  In theory we ought to be able to embed the PCI IO
 294      * memory region direction in the system memory space.  However,
 295      * if any of the IO BAR subregions use the old_portio mechanism,
 296      * that won't be processed properly unless accessed from the
 297      * system io address space.  This hack to bounce things via
 298      * system_io works around the problem until all the users of
 299      * old_portion are updated */
 300     sprintf(namebuf, "%s-io", busname);
 301     memory_region_init(&phb->iospace, namebuf, SPAPR_PCI_IO_WIN_SIZE);
 302     /* FIXME: fix to support multiple PHBs */
 303     memory_region_add_subregion(get_system_io(), 0, &phb->iospace);
 304
 305     sprintf(namebuf, "%s-iowindow", busname);
 306     memory_region_init_io(&phb->iowindow, &spapr_io_ops, phb,
 307                           namebuf, SPAPR_PCI_IO_WIN_SIZE);
 308     memory_region_add_subregion(get_system_memory(), io_win_addr,
 309                                 &phb->iowindow);
 310
 311     phb->host_state.bus = bus = pci_register_bus(&phb->busdev.qdev, busname,
 312                                                  pci_spapr_set_irq,
 313                                                  pci_spapr_map_irq,
 314                                                  phb,
 315                                                  &phb->memspace, &phb->iospace,
 316                                                  PCI_DEVFN(0, 0),
 317                                                  SPAPR_PCI_NUM_LSI);
 318
 319     spapr_rtas_register("read-pci-config", rtas_read_pci_config);
 320     spapr_rtas_register("write-pci-config", rtas_write_pci_config);
 321     spapr_rtas_register("ibm,read-pci-config", rtas_ibm_read_pci_config);
 322     spapr_rtas_register("ibm,write-pci-config", rtas_ibm_write_pci_config);
 323
 324     QLIST_INSERT_HEAD(&spapr->phbs, phb, list);
 325
 326     /* pci_bus_set_mem_base(bus, mem_va_start - SPAPR_PCI_MEM_BAR_START); */
 327 }
 328
 329 /* Macros to operate with address in OF binding to PCI */
 330 #define b_x(x, p, l)    (((x) & ((1<<(l))-1)) << (p))
 331 #define b_n(x)          b_x((x), 31, 1) /* 0 if relocatable */
 332 #define b_p(x)          b_x((x), 30, 1) /* 1 if prefetchable */
 333 #define b_t(x)          b_x((x), 29, 1) /* 1 if the address is aliased */
 334 #define b_ss(x)         b_x((x), 24, 2) /* the space code */
 335 #define b_bbbbbbbb(x)   b_x((x), 16, 8) /* bus number */
 336 #define b_ddddd(x)      b_x((x), 11, 5) /* device number */
 337 #define b_fff(x)        b_x((x), 8, 3)  /* function number */
 338 #define b_rrrrrrrr(x)   b_x((x), 0, 8)  /* register number */
 339
 340 int spapr_populate_pci_devices(sPAPRPHBState *phb,
 341                                uint32_t xics_phandle,
 342                                void *fdt)
 343 {
 344     PCIBus *bus = phb->host_state.bus;
 345     int bus_off, i;
 346     char nodename[256];
 347     uint32_t bus_range[] = { cpu_to_be32(0), cpu_to_be32(0xff) };
 348     struct {
 349         uint32_t hi;
 350         uint64_t child;
 351         uint64_t parent;
 352         uint64_t size;
 353     } __attribute__((packed)) ranges[] = {
 354         {
 355             cpu_to_be32(b_ss(1)), cpu_to_be64(0),
 356             cpu_to_be64(phb->io_win_addr),
 357             cpu_to_be64(memory_region_size(&phb->iospace)),
 358         },
 359         {
 360             cpu_to_be32(b_ss(2)), cpu_to_be64(SPAPR_PCI_MEM_WIN_BUS_OFFSET),
 361             cpu_to_be64(phb->mem_win_addr),
 362             cpu_to_be64(memory_region_size(&phb->memwindow)),
 363         },
 364     };
 365     uint64_t bus_reg[] = { cpu_to_be64(phb->buid), 0 };
 366     uint32_t interrupt_map_mask[] = {
 367         cpu_to_be32(b_ddddd(-1)|b_fff(0)), 0x0, 0x0, 0x0};
 368     uint32_t interrupt_map[bus->nirq][7];
 369
 370     /* Start populating the FDT */
 371     sprintf(nodename, "pci@%" PRIx64, phb->buid);
 372     bus_off = fdt_add_subnode(fdt, 0, nodename);
 373     if (bus_off < 0) {
 374         return bus_off;
 375     }
 376
 377 #define _FDT(exp) \
 378     do { \
 379         int ret = (exp);                                           \
 380         if (ret < 0) {                                             \
 381             return ret;                                            \
 382         }                                                          \
 383     } while (0)
 384
 385     /* Write PHB properties */
 386     _FDT(fdt_setprop_string(fdt, bus_off, "device_type", "pci"));
 387     _FDT(fdt_setprop_string(fdt, bus_off, "compatible", "IBM,Logical_PHB"));
 388     _FDT(fdt_setprop_cell(fdt, bus_off, "#address-cells", 0x3));
 389     _FDT(fdt_setprop_cell(fdt, bus_off, "#size-cells", 0x2));
 390     _FDT(fdt_setprop_cell(fdt, bus_off, "#interrupt-cells", 0x1));
 391     _FDT(fdt_setprop(fdt, bus_off, "used-by-rtas", NULL, 0));
 392     _FDT(fdt_setprop(fdt, bus_off, "bus-range", &bus_range, sizeof(bus_range)));
 393     _FDT(fdt_setprop(fdt, bus_off, "ranges", &ranges, sizeof(ranges)));
 394     _FDT(fdt_setprop(fdt, bus_off, "reg", &bus_reg, sizeof(bus_reg)));
 395     _FDT(fdt_setprop_cell(fdt, bus_off, "ibm,pci-config-space-type", 0x1));
 396
 397     /* Build the interrupt-map, this must matches what is done
 398      * in pci_spapr_map_irq
 399      */
 400     _FDT(fdt_setprop(fdt, bus_off, "interrupt-map-mask",
 401                      &interrupt_map_mask, sizeof(interrupt_map_mask)));
 402     for (i = 0; i < 7; i++) {
 403         uint32_t *irqmap = interrupt_map[i];
 404         irqmap[0] = cpu_to_be32(b_ddddd(i)|b_fff(0));
 405         irqmap[1] = 0;
 406         irqmap[2] = 0;
 407         irqmap[3] = 0;
 408         irqmap[4] = cpu_to_be32(xics_phandle);
 409         irqmap[5] = cpu_to_be32(phb->lsi_table[i % SPAPR_PCI_NUM_LSI].dt_irq);
 410         irqmap[6] = cpu_to_be32(0x8);
 411     }
 412     /* Write interrupt map */
 413     _FDT(fdt_setprop(fdt, bus_off, "interrupt-map", &interrupt_map,
 414                      7 * sizeof(interrupt_map[0])));
 415
 416     return 0;
 417 }