qemu/hw/pci/slotid_cap.c

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#include "hw/pci/slotid_cap.h"
#include "hw/pci/pci.h"
#include "qemu/error-report.h"
#define SLOTID_CAP_LENGTH 4
#define SLOTID_NSLOTS_SHIFT (ffs(PCI_SID_ESR_NSLOTS) - 1)
int slotid_cap_init(PCIDevice *d, int nslots,
uint8_t chassis,
unsigned offset)
{
int cap;
if (!chassis) {
error_report("Bridge chassis not specified. Each bridge is required "
"to be assigned a unique chassis id > 0.");
return -EINVAL;
}
if (nslots < 0 || nslots > (PCI_SID_ESR_NSLOTS >> SLOTID_NSLOTS_SHIFT)) {
/* TODO: error report? */
return -EINVAL;
}
cap = pci_add_capability(d, PCI_CAP_ID_SLOTID, offset, SLOTID_CAP_LENGTH);
if (cap < 0) {
return cap;
}
/* We make each chassis unique, this way each bridge is First in Chassis */
d->config[cap + PCI_SID_ESR] = PCI_SID_ESR_FIC |
(nslots << SLOTID_NSLOTS_SHIFT);
d->cmask[cap + PCI_SID_ESR] = 0xff;
d->config[cap + PCI_SID_CHASSIS_NR] = chassis;
/* Note: Chassis number register is non-volatile,
so we don't reset it. */
/* TODO: store in eeprom? */
d->wmask[cap + PCI_SID_CHASSIS_NR] = 0xff;
d->cap_present |= QEMU_PCI_CAP_SLOTID;
return 0;
}
void slotid_cap_cleanup(PCIDevice *d)
{
/* TODO: cleanup config space? */
d->cap_present &= ~QEMU_PCI_CAP_SLOTID;
}