/* * QEMU PowerPC XIVE interrupt controller model * * * The POWER9 processor comes with a new interrupt controller, called * XIVE as "eXternal Interrupt Virtualization Engine". * * = Overall architecture * * * XIVE Interrupt Controller * +------------------------------------+ IPIs * | +---------+ +---------+ +--------+ | +-------+ * | |VC | |CQ | |PC |----> | CORES | * | | esb | | | | |----> | | * | | eas | | Bridge | | tctx |----> | | * | |SC end | | | | nvt | | | | * +------+ | +---------+ +----+----+ +--------+ | +-+-+-+-+ * | RAM | +------------------|-----------------+ | | | * | | | | | | * | | | | | | * | | +--------------------v------------------------v-v-v--+ other * | <--+ Power Bus +--> chips * | esb | +---------+-----------------------+------------------+ * | eas | | | * | end | +--|------+ | * | nvt | +----+----+ | +----+----+ * +------+ |SC | | |SC | * | | | | | * | PQ-bits | | | PQ-bits | * | local |-+ | in VC | * +---------+ +---------+ * PCIe NX,NPU,CAPI * * SC: Source Controller (aka. IVSE) * VC: Virtualization Controller (aka. IVRE) * PC: Presentation Controller (aka. IVPE) * CQ: Common Queue (Bridge) * * PQ-bits: 2 bits source state machine (P:pending Q:queued) * esb: Event State Buffer (Array of PQ bits in an IVSE) * eas: Event Assignment Structure * end: Event Notification Descriptor * nvt: Notification Virtual Target * tctx: Thread interrupt Context * * * The XIVE IC is composed of three sub-engines : * * - Interrupt Virtualization Source Engine (IVSE), or Source * Controller (SC). These are found in PCI PHBs, in the PSI host * bridge controller, but also inside the main controller for the * core IPIs and other sub-chips (NX, CAP, NPU) of the * chip/processor. They are configured to feed the IVRE with events. * * - Interrupt Virtualization Routing Engine (IVRE) or Virtualization * Controller (VC). Its job is to match an event source with an * Event Notification Descriptor (END). * * - Interrupt Virtualization Presentation Engine (IVPE) or * Presentation Controller (PC). It maintains the interrupt context * state of each thread and handles the delivery of the external * exception to the thread. * * In XIVE 1.0, the sub-engines used to be referred as: * * SC Source Controller * VC Virtualization Controller * PC Presentation Controller * CQ Common Queue (PowerBUS Bridge) * * * = XIVE internal tables * * Each of the sub-engines uses a set of tables to redirect exceptions * from event sources to CPU threads. * * +-------+ * User or OS | EQ | * or +------>|entries| * Hypervisor | | .. | * Memory | +-------+ * | ^ * | | * +-------------------------------------------------+ * | | * Hypervisor +------+ +---+--+ +---+--+ +------+ * Memory | ESB | | EAT | | ENDT | | NVTT | * (skiboot) +----+-+ +----+-+ +----+-+ +------+ * ^ | ^ | ^ | ^ * | | | | | | | * +-------------------------------------------------+ * | | | | | | | * | | | | | | | * +----|--|--------|--|--------|--|-+ +-|-----+ +------+ * | | | | | | | | | | tctx| |Thread| * IPI or --> | + v + v + v |---| + .. |-----> | * HW events --> | | | | | | * IVSE | IVRE | | IVPE | +------+ * +---------------------------------+ +-------+ * * * * The IVSE have a 2-bits state machine, P for pending and Q for queued, * for each source that allows events to be triggered. They are stored in * an Event State Buffer (ESB) array and can be controlled by MMIOs. * * If the event is let through, the IVRE looks up in the Event Assignment * Structure (EAS) table for an Event Notification Descriptor (END) * configured for the source. Each Event Notification Descriptor defines * a notification path to a CPU and an in-memory Event Queue, in which * will be enqueued an EQ data for the OS to pull. * * The IVPE determines if a Notification Virtual Target (NVT) can * handle the event by scanning the thread contexts of the VCPUs * dispatched on the processor HW threads. It maintains the state of * the thread interrupt context (TCTX) of each thread in a NVT table. * * = Acronyms * * Description In XIVE 1.0, used to be referred as * * EAS Event Assignment Structure IVE Interrupt Virt. Entry * EAT Event Assignment Table IVT Interrupt Virt. Table * ENDT Event Notif. Descriptor Table EQDT Event Queue Desc. Table * EQ Event Queue same * ESB Event State Buffer SBE State Bit Entry * NVT Notif. Virtual Target VPD Virtual Processor Desc. * NVTT Notif. Virtual Target Table VPDT Virtual Processor Desc. Table * TCTX Thread interrupt Context * * * Copyright (c) 2017-2018, IBM Corporation. * * This code is licensed under the GPL version 2 or later. See the * COPYING file in the top-level directory. * */ #ifndef PPC_XIVE_H #define PPC_XIVE_H #include "hw/qdev-core.h" #include "hw/sysbus.h" #include "hw/ppc/xive_regs.h" /* * XIVE Fabric (Interface between Source and Router) */ typedef struct XiveNotifier { Object parent; } XiveNotifier; #define TYPE_XIVE_NOTIFIER "xive-notifier" #define XIVE_NOTIFIER(obj) \ OBJECT_CHECK(XiveNotifier, (obj), TYPE_XIVE_NOTIFIER) #define XIVE_NOTIFIER_CLASS(klass) \ OBJECT_CLASS_CHECK(XiveNotifierClass, (klass), TYPE_XIVE_NOTIFIER) #define XIVE_NOTIFIER_GET_CLASS(obj) \ OBJECT_GET_CLASS(XiveNotifierClass, (obj), TYPE_XIVE_NOTIFIER) typedef struct XiveNotifierClass { InterfaceClass parent; void (*notify)(XiveNotifier *xn, uint32_t lisn); } XiveNotifierClass; /* * XIVE Interrupt Source */ #define TYPE_XIVE_SOURCE "xive-source" #define XIVE_SOURCE(obj) OBJECT_CHECK(XiveSource, (obj), TYPE_XIVE_SOURCE) /* * XIVE Interrupt Source characteristics, which define how the ESB are * controlled. */ #define XIVE_SRC_H_INT_ESB 0x1 /* ESB managed with hcall H_INT_ESB */ #define XIVE_SRC_STORE_EOI 0x2 /* Store EOI supported */ typedef struct XiveSource { DeviceState parent; /* IRQs */ uint32_t nr_irqs; qemu_irq *qirqs; unsigned long *lsi_map; /* PQ bits and LSI assertion bit */ uint8_t *status; /* ESB memory region */ uint64_t esb_flags; uint32_t esb_shift; MemoryRegion esb_mmio; XiveNotifier *xive; } XiveSource; /* * ESB MMIO setting. Can be one page, for both source triggering and * source management, or two different pages. See below for magic * values. */ #define XIVE_ESB_4K 12 /* PSI HB only */ #define XIVE_ESB_4K_2PAGE 13 #define XIVE_ESB_64K 16 #define XIVE_ESB_64K_2PAGE 17 static inline bool xive_source_esb_has_2page(XiveSource *xsrc) { return xsrc->esb_shift == XIVE_ESB_64K_2PAGE || xsrc->esb_shift == XIVE_ESB_4K_2PAGE; } /* The trigger page is always the first/even page */ static inline hwaddr xive_source_esb_page(XiveSource *xsrc, uint32_t srcno) { assert(srcno < xsrc->nr_irqs); return (1ull << xsrc->esb_shift) * srcno; } /* In a two pages ESB MMIO setting, the odd page is for management */ static inline hwaddr xive_source_esb_mgmt(XiveSource *xsrc, int srcno) { hwaddr addr = xive_source_esb_page(xsrc, srcno); if (xive_source_esb_has_2page(xsrc)) { addr += (1 << (xsrc->esb_shift - 1)); } return addr; } /* * Each interrupt source has a 2-bit state machine which can be * controlled by MMIO. P indicates that an interrupt is pending (has * been sent to a queue and is waiting for an EOI). Q indicates that * the interrupt has been triggered while pending. * * This acts as a coalescing mechanism in order to guarantee that a * given interrupt only occurs at most once in a queue. * * When doing an EOI, the Q bit will indicate if the interrupt * needs to be re-triggered. */ #define XIVE_STATUS_ASSERTED 0x4 /* Extra bit for LSI */ #define XIVE_ESB_VAL_P 0x2 #define XIVE_ESB_VAL_Q 0x1 #define XIVE_ESB_RESET 0x0 #define XIVE_ESB_PENDING XIVE_ESB_VAL_P #define XIVE_ESB_QUEUED (XIVE_ESB_VAL_P | XIVE_ESB_VAL_Q) #define XIVE_ESB_OFF XIVE_ESB_VAL_Q /* * "magic" Event State Buffer (ESB) MMIO offsets. * * The following offsets into the ESB MMIO allow to read or manipulate * the PQ bits. They must be used with an 8-byte load instruction. * They all return the previous state of the interrupt (atomically). * * Additionally, some ESB pages support doing an EOI via a store and * some ESBs support doing a trigger via a separate trigger page. */ #define XIVE_ESB_STORE_EOI 0x400 /* Store */ #define XIVE_ESB_LOAD_EOI 0x000 /* Load */ #define XIVE_ESB_GET 0x800 /* Load */ #define XIVE_ESB_SET_PQ_00 0xc00 /* Load */ #define XIVE_ESB_SET_PQ_01 0xd00 /* Load */ #define XIVE_ESB_SET_PQ_10 0xe00 /* Load */ #define XIVE_ESB_SET_PQ_11 0xf00 /* Load */ uint8_t xive_source_esb_get(XiveSource *xsrc, uint32_t srcno); uint8_t xive_source_esb_set(XiveSource *xsrc, uint32_t srcno, uint8_t pq); void xive_source_pic_print_info(XiveSource *xsrc, uint32_t offset, Monitor *mon); static inline bool xive_source_irq_is_lsi(XiveSource *xsrc, uint32_t srcno) { assert(srcno < xsrc->nr_irqs); return test_bit(srcno, xsrc->lsi_map); } static inline void xive_source_irq_set(XiveSource *xsrc, uint32_t srcno, bool lsi) { assert(srcno < xsrc->nr_irqs); if (lsi) { bitmap_set(xsrc->lsi_map, srcno, 1); } } /* * XIVE Router */ typedef struct XiveRouter { SysBusDevice parent; } XiveRouter; #define TYPE_XIVE_ROUTER "xive-router" #define XIVE_ROUTER(obj) \ OBJECT_CHECK(XiveRouter, (obj), TYPE_XIVE_ROUTER) #define XIVE_ROUTER_CLASS(klass) \ OBJECT_CLASS_CHECK(XiveRouterClass, (klass), TYPE_XIVE_ROUTER) #define XIVE_ROUTER_GET_CLASS(obj) \ OBJECT_GET_CLASS(XiveRouterClass, (obj), TYPE_XIVE_ROUTER) typedef struct XiveRouterClass { SysBusDeviceClass parent; /* XIVE table accessors */ int (*get_eas)(XiveRouter *xrtr, uint8_t eas_blk, uint32_t eas_idx, XiveEAS *eas); int (*get_end)(XiveRouter *xrtr, uint8_t end_blk, uint32_t end_idx, XiveEND *end); int (*write_end)(XiveRouter *xrtr, uint8_t end_blk, uint32_t end_idx, XiveEND *end, uint8_t word_number); int (*get_nvt)(XiveRouter *xrtr, uint8_t nvt_blk, uint32_t nvt_idx, XiveNVT *nvt); int (*write_nvt)(XiveRouter *xrtr, uint8_t nvt_blk, uint32_t nvt_idx, XiveNVT *nvt, uint8_t word_number); } XiveRouterClass; void xive_eas_pic_print_info(XiveEAS *eas, uint32_t lisn, Monitor *mon); int xive_router_get_eas(XiveRouter *xrtr, uint8_t eas_blk, uint32_t eas_idx, XiveEAS *eas); int xive_router_get_end(XiveRouter *xrtr, uint8_t end_blk, uint32_t end_idx, XiveEND *end); int xive_router_write_end(XiveRouter *xrtr, uint8_t end_blk, uint32_t end_idx, XiveEND *end, uint8_t word_number); int xive_router_get_nvt(XiveRouter *xrtr, uint8_t nvt_blk, uint32_t nvt_idx, XiveNVT *nvt); int xive_router_write_nvt(XiveRouter *xrtr, uint8_t nvt_blk, uint32_t nvt_idx, XiveNVT *nvt, uint8_t word_number); /* * XIVE END ESBs */ #define TYPE_XIVE_END_SOURCE "xive-end-source" #define XIVE_END_SOURCE(obj) \ OBJECT_CHECK(XiveENDSource, (obj), TYPE_XIVE_END_SOURCE) typedef struct XiveENDSource { DeviceState parent; uint32_t nr_ends; uint8_t block_id; /* ESB memory region */ uint32_t esb_shift; MemoryRegion esb_mmio; XiveRouter *xrtr; } XiveENDSource; /* * For legacy compatibility, the exceptions define up to 256 different * priorities. P9 implements only 9 levels : 8 active levels [0 - 7] * and the least favored level 0xFF. */ #define XIVE_PRIORITY_MAX 7 void xive_end_pic_print_info(XiveEND *end, uint32_t end_idx, Monitor *mon); void xive_end_queue_pic_print_info(XiveEND *end, uint32_t width, Monitor *mon); /* * XIVE Thread interrupt Management (TM) context */ #define TYPE_XIVE_TCTX "xive-tctx" #define XIVE_TCTX(obj) OBJECT_CHECK(XiveTCTX, (obj), TYPE_XIVE_TCTX) /* * XIVE Thread interrupt Management register rings : * * QW-0 User event-based exception state * QW-1 O/S OS context for priority management, interrupt acks * QW-2 Pool hypervisor pool context for virtual processors dispatched * QW-3 Physical physical thread context and security context */ #define XIVE_TM_RING_COUNT 4 #define XIVE_TM_RING_SIZE 0x10 typedef struct XiveTCTX { DeviceState parent_obj; CPUState *cs; qemu_irq output; uint8_t regs[XIVE_TM_RING_COUNT * XIVE_TM_RING_SIZE]; } XiveTCTX; /* * XIVE Thread Interrupt Management Aera (TIMA) * * This region gives access to the registers of the thread interrupt * management context. It is four page wide, each page providing a * different view of the registers. The page with the lower offset is * the most privileged and gives access to the entire context. */ #define XIVE_TM_HW_PAGE 0x0 #define XIVE_TM_HV_PAGE 0x1 #define XIVE_TM_OS_PAGE 0x2 #define XIVE_TM_USER_PAGE 0x3 extern const MemoryRegionOps xive_tm_ops; void xive_tctx_pic_print_info(XiveTCTX *tctx, Monitor *mon); Object *xive_tctx_create(Object *cpu, XiveRouter *xrtr, Error **errp); static inline uint32_t xive_nvt_cam_line(uint8_t nvt_blk, uint32_t nvt_idx) { return (nvt_blk << 19) | nvt_idx; } #endif /* PPC_XIVE_H */