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