/*
* 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 qemu_irq xive_source_qirq(XiveSource *xsrc, uint32_t srcno)
{
assert(srcno < xsrc->nr_irqs);
return xsrc->qirqs[srcno];
}
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);
} 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);
/*
* 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);
#endif /* PPC_XIVE_H */
