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 } 51