hw/pci/slotid_cap.c

   1 #include "qemu/osdep.h"
   2 #include "hw/pci/slotid_cap.h"
   3 #include "hw/pci/pci.h"
   4 #include "qemu/error-report.h"
   5 #include "qapi/error.h"
   6
   7 #define SLOTID_CAP_LENGTH 4
   8 #define SLOTID_NSLOTS_SHIFT ctz32(PCI_SID_ESR_NSLOTS)
   9
  10 int slotid_cap_init(PCIDevice *d, int nslots,
  11                     uint8_t chassis,
  12                     unsigned offset,
  13                     Error **errp)
  14 {
  15     int cap;
  16
  17     if (!chassis) {
  18         error_setg(errp, "Bridge chassis not specified. Each bridge is required"
  19                    " to be assigned a unique chassis id > 0.");
  20         return -EINVAL;
  21     }
  22     if (nslots < 0 || nslots > (PCI_SID_ESR_NSLOTS >> SLOTID_NSLOTS_SHIFT)) {
  23         /* TODO: error report? */
  24         return -EINVAL;
  25     }
  26
  27     cap = pci_add_capability(d, PCI_CAP_ID_SLOTID, offset,
  28                              SLOTID_CAP_LENGTH, errp);
  29     if (cap < 0) {
  30         return cap;
  31     }
  32     /* We make each chassis unique, this way each bridge is First in Chassis */
  33     d->config[cap + PCI_SID_ESR] = PCI_SID_ESR_FIC |
  34         (nslots << SLOTID_NSLOTS_SHIFT);
  35     d->cmask[cap + PCI_SID_ESR] = 0xff;
  36     d->config[cap + PCI_SID_CHASSIS_NR] = chassis;
  37     /* Note: Chassis number register is non-volatile,
  38        so we don't reset it. */
  39     /* TODO: store in eeprom? */
  40     d->wmask[cap + PCI_SID_CHASSIS_NR] = 0xff;
  41
  42     d->cap_present |= QEMU_PCI_CAP_SLOTID;
  43     return 0;
  44 }
  45
  46 void slotid_cap_cleanup(PCIDevice *d)
  47 {
  48     /* TODO: cleanup config space? */
  49     d->cap_present &= ~QEMU_PCI_CAP_SLOTID;
  50 }