LXR qemu/hw/pci/slotid

   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
  10int 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
  46void slotid_cap_cleanup(PCIDevice *d)
  47{
  48    /* TODO: cleanup config space? */
  49    d->cap_present &= ~QEMU_PCI_CAP_SLOTID;
  50}
  51