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qemu/hw/intc/xive2.c
Frederic Barrat f657721187 ppc/xive: Update the state of the External interrupt signal 
When pulling or pushing an OS context from/to a CPU, we should
re-evaluate the state of the External interrupt signal. Otherwise, we
can end up catching the External interrupt exception in hypervisor
mode, which is unexpected.

The problem is best illustrated with the following scenario:

1. an External interrupt is raised while the guest is on the CPU.

2. before the guest can ack the External interrupt, an hypervisor
interrupt is raised, for example the Hypervisor Decrementer or
Hypervisor Virtualization interrupt. The hypervisor interrupt forces
the guest to exit while the External interrupt is still pending.

3. the hypervisor handles the hypervisor interrupt. At this point, the
External interrupt is still pending. So it's very likely to be
delivered while the hypervisor is running. That's unexpected and can
result in an infinite loop where the hypervisor catches the External
interrupt, looks for an interrupt in its hypervisor queue, doesn't
find any, exits the interrupt handler with the External interrupt
still raised, repeat...

The fix is simply to always lower the External interrupt signal when
pulling an OS context. It means it needs to be raised again when
re-pushing the OS context. Fortunately, it's already the case, as we
now always call xive_tctx_ipb_update(), which will raise the signal if
needed.

Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Message-Id: <20220429071620.177142-3-fbarrat@linux.ibm.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
2022-05-05 15:36:17 -03:00

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/*
* QEMU PowerPC XIVE2 interrupt controller model (POWER10)
*
* Copyright (c) 2019-2022, IBM Corporation..
*
* This code is licensed under the GPL version 2 or later. See the
* COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "qapi/error.h"
#include "target/ppc/cpu.h"
#include "sysemu/cpus.h"
#include "sysemu/dma.h"
#include "hw/qdev-properties.h"
#include "monitor/monitor.h"
#include "hw/ppc/xive.h"
#include "hw/ppc/xive2.h"
#include "hw/ppc/xive2_regs.h"
uint32_t xive2_router_get_config(Xive2Router *xrtr)
{
Xive2RouterClass *xrc = XIVE2_ROUTER_GET_CLASS(xrtr);
return xrc->get_config(xrtr);
}
void xive2_eas_pic_print_info(Xive2Eas *eas, uint32_t lisn, Monitor *mon)
{
if (!xive2_eas_is_valid(eas)) {
return;
}
monitor_printf(mon, " %08x %s end:%02x/%04x data:%08x\n",
lisn, xive2_eas_is_masked(eas) ? "M" : " ",
(uint8_t) xive_get_field64(EAS2_END_BLOCK, eas->w),
(uint32_t) xive_get_field64(EAS2_END_INDEX, eas->w),
(uint32_t) xive_get_field64(EAS2_END_DATA, eas->w));
}
void xive2_end_queue_pic_print_info(Xive2End *end, uint32_t width,
Monitor *mon)
{
uint64_t qaddr_base = xive2_end_qaddr(end);
uint32_t qsize = xive_get_field32(END2_W3_QSIZE, end->w3);
uint32_t qindex = xive_get_field32(END2_W1_PAGE_OFF, end->w1);
uint32_t qentries = 1 << (qsize + 10);
int i;
/*
* print out the [ (qindex - (width - 1)) .. (qindex + 1)] window
*/
monitor_printf(mon, " [ ");
qindex = (qindex - (width - 1)) & (qentries - 1);
for (i = 0; i < width; i++) {
uint64_t qaddr = qaddr_base + (qindex << 2);
uint32_t qdata = -1;
if (dma_memory_read(&address_space_memory, qaddr, &qdata,
sizeof(qdata), MEMTXATTRS_UNSPECIFIED)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: failed to read EQ @0x%"
HWADDR_PRIx "\n", qaddr);
return;
}
monitor_printf(mon, "%s%08x ", i == width - 1 ? "^" : "",
be32_to_cpu(qdata));
qindex = (qindex + 1) & (qentries - 1);
}
monitor_printf(mon, "]");
}
void xive2_end_pic_print_info(Xive2End *end, uint32_t end_idx, Monitor *mon)
{
uint64_t qaddr_base = xive2_end_qaddr(end);
uint32_t qindex = xive_get_field32(END2_W1_PAGE_OFF, end->w1);
uint32_t qgen = xive_get_field32(END2_W1_GENERATION, end->w1);
uint32_t qsize = xive_get_field32(END2_W3_QSIZE, end->w3);
uint32_t qentries = 1 << (qsize + 10);
uint32_t nvp_blk = xive_get_field32(END2_W6_VP_BLOCK, end->w6);
uint32_t nvp_idx = xive_get_field32(END2_W6_VP_OFFSET, end->w6);
uint8_t priority = xive_get_field32(END2_W7_F0_PRIORITY, end->w7);
uint8_t pq;
if (!xive2_end_is_valid(end)) {
return;
}
pq = xive_get_field32(END2_W1_ESn, end->w1);
monitor_printf(mon,
" %08x %c%c %c%c%c%c%c%c%c%c%c%c prio:%d nvp:%02x/%04x",
end_idx,
pq & XIVE_ESB_VAL_P ? 'P' : '-',
pq & XIVE_ESB_VAL_Q ? 'Q' : '-',
xive2_end_is_valid(end) ? 'v' : '-',
xive2_end_is_enqueue(end) ? 'q' : '-',
xive2_end_is_notify(end) ? 'n' : '-',
xive2_end_is_backlog(end) ? 'b' : '-',
xive2_end_is_escalate(end) ? 'e' : '-',
xive2_end_is_escalate_end(end) ? 'N' : '-',
xive2_end_is_uncond_escalation(end) ? 'u' : '-',
xive2_end_is_silent_escalation(end) ? 's' : '-',
xive2_end_is_firmware1(end) ? 'f' : '-',
xive2_end_is_firmware2(end) ? 'F' : '-',
priority, nvp_blk, nvp_idx);
if (qaddr_base) {
monitor_printf(mon, " eq:@%08"PRIx64"% 6d/%5d ^%d",
qaddr_base, qindex, qentries, qgen);
xive2_end_queue_pic_print_info(end, 6, mon);
}
monitor_printf(mon, "\n");
}
void xive2_end_eas_pic_print_info(Xive2End *end, uint32_t end_idx,
Monitor *mon)
{
Xive2Eas *eas = (Xive2Eas *) &end->w4;
uint8_t pq;
if (!xive2_end_is_escalate(end)) {
return;
}
pq = xive_get_field32(END2_W1_ESe, end->w1);
monitor_printf(mon, " %08x %c%c %c%c end:%02x/%04x data:%08x\n",
end_idx,
pq & XIVE_ESB_VAL_P ? 'P' : '-',
pq & XIVE_ESB_VAL_Q ? 'Q' : '-',
xive2_eas_is_valid(eas) ? 'v' : ' ',
xive2_eas_is_masked(eas) ? 'M' : ' ',
(uint8_t) xive_get_field64(EAS2_END_BLOCK, eas->w),
(uint32_t) xive_get_field64(EAS2_END_INDEX, eas->w),
(uint32_t) xive_get_field64(EAS2_END_DATA, eas->w));
}
static void xive2_end_enqueue(Xive2End *end, uint32_t data)
{
uint64_t qaddr_base = xive2_end_qaddr(end);
uint32_t qsize = xive_get_field32(END2_W3_QSIZE, end->w3);
uint32_t qindex = xive_get_field32(END2_W1_PAGE_OFF, end->w1);
uint32_t qgen = xive_get_field32(END2_W1_GENERATION, end->w1);
uint64_t qaddr = qaddr_base + (qindex << 2);
uint32_t qdata = cpu_to_be32((qgen << 31) | (data & 0x7fffffff));
uint32_t qentries = 1 << (qsize + 10);
if (dma_memory_write(&address_space_memory, qaddr, &qdata, sizeof(qdata),
MEMTXATTRS_UNSPECIFIED)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: failed to write END data @0x%"
HWADDR_PRIx "\n", qaddr);
return;
}
qindex = (qindex + 1) & (qentries - 1);
if (qindex == 0) {
qgen ^= 1;
end->w1 = xive_set_field32(END2_W1_GENERATION, end->w1, qgen);
/* TODO(PowerNV): reset GF bit on a cache watch operation */
end->w1 = xive_set_field32(END2_W1_GEN_FLIPPED, end->w1, qgen);
}
end->w1 = xive_set_field32(END2_W1_PAGE_OFF, end->w1, qindex);
}
/*
* XIVE Thread Interrupt Management Area (TIMA) - Gen2 mode
*
* TIMA Gen2 VP “save & restore” (S&R) indicated by H bit next to V bit
*
* - if a context is enabled with the H bit set, the VP context
* information is retrieved from the NVP structure (“check out”)
* and stored back on a context pull (“check in”), the SW receives
* the same context pull information as on P9
*
* - the H bit cannot be changed while the V bit is set, i.e. a
* context cannot be set up in the TIMA and then be “pushed” into
* the NVP by changing the H bit while the context is enabled
*/
static void xive2_tctx_save_os_ctx(Xive2Router *xrtr, XiveTCTX *tctx,
uint8_t nvp_blk, uint32_t nvp_idx)
{
CPUPPCState *env = &POWERPC_CPU(tctx->cs)->env;
uint32_t pir = env->spr_cb[SPR_PIR].default_value;
Xive2Nvp nvp;
uint8_t *regs = &tctx->regs[TM_QW1_OS];
if (xive2_router_get_nvp(xrtr, nvp_blk, nvp_idx, &nvp)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: No NVP %x/%x\n",
nvp_blk, nvp_idx);
return;
}
if (!xive2_nvp_is_valid(&nvp)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid NVP %x/%x\n",
nvp_blk, nvp_idx);
return;
}
if (!xive2_nvp_is_hw(&nvp)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: NVP %x/%x is not HW owned\n",
nvp_blk, nvp_idx);
return;
}
if (!xive2_nvp_is_co(&nvp)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: NVP %x/%x is not checkout\n",
nvp_blk, nvp_idx);
return;
}
if (xive_get_field32(NVP2_W1_CO_THRID_VALID, nvp.w1) &&
xive_get_field32(NVP2_W1_CO_THRID, nvp.w1) != pir) {
qemu_log_mask(LOG_GUEST_ERROR,
"XIVE: NVP %x/%x invalid checkout Thread %x\n",
nvp_blk, nvp_idx, pir);
return;
}
nvp.w2 = xive_set_field32(NVP2_W2_IPB, nvp.w2, regs[TM_IPB]);
nvp.w2 = xive_set_field32(NVP2_W2_CPPR, nvp.w2, regs[TM_CPPR]);
nvp.w2 = xive_set_field32(NVP2_W2_LSMFB, nvp.w2, regs[TM_LSMFB]);
xive2_router_write_nvp(xrtr, nvp_blk, nvp_idx, &nvp, 2);
nvp.w1 = xive_set_field32(NVP2_W1_CO, nvp.w1, 0);
/* NVP2_W1_CO_THRID_VALID only set once */
nvp.w1 = xive_set_field32(NVP2_W1_CO_THRID, nvp.w1, 0xFFFF);
xive2_router_write_nvp(xrtr, nvp_blk, nvp_idx, &nvp, 1);
}
static void xive2_os_cam_decode(uint32_t cam, uint8_t *nvp_blk,
uint32_t *nvp_idx, bool *vo, bool *ho)
{
*nvp_blk = xive2_nvp_blk(cam);
*nvp_idx = xive2_nvp_idx(cam);
*vo = !!(cam & TM2_QW1W2_VO);
*ho = !!(cam & TM2_QW1W2_HO);
}
uint64_t xive2_tm_pull_os_ctx(XivePresenter *xptr, XiveTCTX *tctx,
hwaddr offset, unsigned size)
{
Xive2Router *xrtr = XIVE2_ROUTER(xptr);
uint32_t qw1w2 = xive_tctx_word2(&tctx->regs[TM_QW1_OS]);
uint32_t qw1w2_new;
uint32_t cam = be32_to_cpu(qw1w2);
uint8_t nvp_blk;
uint32_t nvp_idx;
bool vo;
bool do_save;
xive2_os_cam_decode(cam, &nvp_blk, &nvp_idx, &vo, &do_save);
if (!vo) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: pulling invalid NVP %x/%x !?\n",
nvp_blk, nvp_idx);
}
/* Invalidate CAM line */
qw1w2_new = xive_set_field32(TM2_QW1W2_VO, qw1w2, 0);
memcpy(&tctx->regs[TM_QW1_OS + TM_WORD2], &qw1w2_new, 4);
if (xive2_router_get_config(xrtr) & XIVE2_VP_SAVE_RESTORE && do_save) {
xive2_tctx_save_os_ctx(xrtr, tctx, nvp_blk, nvp_idx);
}
xive_tctx_reset_os_signal(tctx);
return qw1w2;
}
static uint8_t xive2_tctx_restore_os_ctx(Xive2Router *xrtr, XiveTCTX *tctx,
uint8_t nvp_blk, uint32_t nvp_idx,
Xive2Nvp *nvp)
{
CPUPPCState *env = &POWERPC_CPU(tctx->cs)->env;
uint32_t pir = env->spr_cb[SPR_PIR].default_value;
uint8_t cppr;
if (!xive2_nvp_is_hw(nvp)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: NVP %x/%x is not HW owned\n",
nvp_blk, nvp_idx);
return 0;
}
cppr = xive_get_field32(NVP2_W2_CPPR, nvp->w2);
nvp->w2 = xive_set_field32(NVP2_W2_CPPR, nvp->w2, 0);
xive2_router_write_nvp(xrtr, nvp_blk, nvp_idx, nvp, 2);
tctx->regs[TM_QW1_OS + TM_CPPR] = cppr;
/* we don't model LSMFB */
nvp->w1 = xive_set_field32(NVP2_W1_CO, nvp->w1, 1);
nvp->w1 = xive_set_field32(NVP2_W1_CO_THRID_VALID, nvp->w1, 1);
nvp->w1 = xive_set_field32(NVP2_W1_CO_THRID, nvp->w1, pir);
/*
* Checkout privilege: 0:OS, 1:Pool, 2:Hard
*
* TODO: we only support OS push/pull
*/
nvp->w1 = xive_set_field32(NVP2_W1_CO_PRIV, nvp->w1, 0);
xive2_router_write_nvp(xrtr, nvp_blk, nvp_idx, nvp, 1);
/* return restored CPPR to generate a CPU exception if needed */
return cppr;
}
static void xive2_tctx_need_resend(Xive2Router *xrtr, XiveTCTX *tctx,
uint8_t nvp_blk, uint32_t nvp_idx,
bool do_restore)
{
Xive2Nvp nvp;
uint8_t ipb;
/*
* Grab the associated thread interrupt context registers in the
* associated NVP
*/
if (xive2_router_get_nvp(xrtr, nvp_blk, nvp_idx, &nvp)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: No NVP %x/%x\n",
nvp_blk, nvp_idx);
return;
}
if (!xive2_nvp_is_valid(&nvp)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid NVP %x/%x\n",
nvp_blk, nvp_idx);
return;
}
/* Automatically restore thread context registers */
if (xive2_router_get_config(xrtr) & XIVE2_VP_SAVE_RESTORE &&
do_restore) {
xive2_tctx_restore_os_ctx(xrtr, tctx, nvp_blk, nvp_idx, &nvp);
}
ipb = xive_get_field32(NVP2_W2_IPB, nvp.w2);
if (ipb) {
nvp.w2 = xive_set_field32(NVP2_W2_IPB, nvp.w2, 0);
xive2_router_write_nvp(xrtr, nvp_blk, nvp_idx, &nvp, 2);
}
/*
* Always call xive_tctx_ipb_update(). Even if there were no
* escalation triggered, there could be a pending interrupt which
* was saved when the context was pulled and that we need to take
* into account by recalculating the PIPR (which is not
* saved/restored).
* It will also raise the External interrupt signal if needed.
*/
xive_tctx_ipb_update(tctx, TM_QW1_OS, ipb);
}
/*
* Updating the OS CAM line can trigger a resend of interrupt
*/
void xive2_tm_push_os_ctx(XivePresenter *xptr, XiveTCTX *tctx,
hwaddr offset, uint64_t value, unsigned size)
{
uint32_t cam = value;
uint32_t qw1w2 = cpu_to_be32(cam);
uint8_t nvp_blk;
uint32_t nvp_idx;
bool vo;
bool do_restore;
xive2_os_cam_decode(cam, &nvp_blk, &nvp_idx, &vo, &do_restore);
/* First update the thead context */
memcpy(&tctx->regs[TM_QW1_OS + TM_WORD2], &qw1w2, 4);
/* Check the interrupt pending bits */
if (vo) {
xive2_tctx_need_resend(XIVE2_ROUTER(xptr), tctx, nvp_blk, nvp_idx,
do_restore);
}
}
/*
* XIVE Router (aka. Virtualization Controller or IVRE)
*/
int xive2_router_get_eas(Xive2Router *xrtr, uint8_t eas_blk, uint32_t eas_idx,
Xive2Eas *eas)
{
Xive2RouterClass *xrc = XIVE2_ROUTER_GET_CLASS(xrtr);
return xrc->get_eas(xrtr, eas_blk, eas_idx, eas);
}
static
int xive2_router_get_pq(Xive2Router *xrtr, uint8_t eas_blk, uint32_t eas_idx,
uint8_t *pq)
{
Xive2RouterClass *xrc = XIVE2_ROUTER_GET_CLASS(xrtr);
return xrc->get_pq(xrtr, eas_blk, eas_idx, pq);
}
static
int xive2_router_set_pq(Xive2Router *xrtr, uint8_t eas_blk, uint32_t eas_idx,
uint8_t *pq)
{
Xive2RouterClass *xrc = XIVE2_ROUTER_GET_CLASS(xrtr);
return xrc->set_pq(xrtr, eas_blk, eas_idx, pq);
}
int xive2_router_get_end(Xive2Router *xrtr, uint8_t end_blk, uint32_t end_idx,
Xive2End *end)
{
Xive2RouterClass *xrc = XIVE2_ROUTER_GET_CLASS(xrtr);
return xrc->get_end(xrtr, end_blk, end_idx, end);
}
int xive2_router_write_end(Xive2Router *xrtr, uint8_t end_blk, uint32_t end_idx,
Xive2End *end, uint8_t word_number)
{
Xive2RouterClass *xrc = XIVE2_ROUTER_GET_CLASS(xrtr);
return xrc->write_end(xrtr, end_blk, end_idx, end, word_number);
}
int xive2_router_get_nvp(Xive2Router *xrtr, uint8_t nvp_blk, uint32_t nvp_idx,
Xive2Nvp *nvp)
{
Xive2RouterClass *xrc = XIVE2_ROUTER_GET_CLASS(xrtr);
return xrc->get_nvp(xrtr, nvp_blk, nvp_idx, nvp);
}
int xive2_router_write_nvp(Xive2Router *xrtr, uint8_t nvp_blk, uint32_t nvp_idx,
Xive2Nvp *nvp, uint8_t word_number)
{
Xive2RouterClass *xrc = XIVE2_ROUTER_GET_CLASS(xrtr);
return xrc->write_nvp(xrtr, nvp_blk, nvp_idx, nvp, word_number);
}
static int xive2_router_get_block_id(Xive2Router *xrtr)
{
Xive2RouterClass *xrc = XIVE2_ROUTER_GET_CLASS(xrtr);
return xrc->get_block_id(xrtr);
}
/*
* Encode the HW CAM line with 7bit or 8bit thread id. The thread id
* width and block id width is configurable at the IC level.
*
* chipid << 24 | 0000 0000 0000 0000 1 threadid (7Bit)
* chipid << 24 | 0000 0000 0000 0001 threadid (8Bit)
*/
static uint32_t xive2_tctx_hw_cam_line(XivePresenter *xptr, XiveTCTX *tctx)
{
Xive2Router *xrtr = XIVE2_ROUTER(xptr);
CPUPPCState *env = &POWERPC_CPU(tctx->cs)->env;
uint32_t pir = env->spr_cb[SPR_PIR].default_value;
uint8_t blk = xive2_router_get_block_id(xrtr);
uint8_t tid_shift =
xive2_router_get_config(xrtr) & XIVE2_THREADID_8BITS ? 8 : 7;
uint8_t tid_mask = (1 << tid_shift) - 1;
return xive2_nvp_cam_line(blk, 1 << tid_shift | (pir & tid_mask));
}
/*
* The thread context register words are in big-endian format.
*/
int xive2_presenter_tctx_match(XivePresenter *xptr, XiveTCTX *tctx,
uint8_t format,
uint8_t nvt_blk, uint32_t nvt_idx,
bool cam_ignore, uint32_t logic_serv)
{
uint32_t cam = xive2_nvp_cam_line(nvt_blk, nvt_idx);
uint32_t qw3w2 = xive_tctx_word2(&tctx->regs[TM_QW3_HV_PHYS]);
uint32_t qw2w2 = xive_tctx_word2(&tctx->regs[TM_QW2_HV_POOL]);
uint32_t qw1w2 = xive_tctx_word2(&tctx->regs[TM_QW1_OS]);
uint32_t qw0w2 = xive_tctx_word2(&tctx->regs[TM_QW0_USER]);
/*
* TODO (PowerNV): ignore mode. The low order bits of the NVT
* identifier are ignored in the "CAM" match.
*/
if (format == 0) {
if (cam_ignore == true) {
/*
* F=0 & i=1: Logical server notification (bits ignored at
* the end of the NVT identifier)
*/
qemu_log_mask(LOG_UNIMP, "XIVE: no support for LS NVT %x/%x\n",
nvt_blk, nvt_idx);
return -1;
}
/* F=0 & i=0: Specific NVT notification */
/* PHYS ring */
if ((be32_to_cpu(qw3w2) & TM2_QW3W2_VT) &&
cam == xive2_tctx_hw_cam_line(xptr, tctx)) {
return TM_QW3_HV_PHYS;
}
/* HV POOL ring */
if ((be32_to_cpu(qw2w2) & TM2_QW2W2_VP) &&
cam == xive_get_field32(TM2_QW2W2_POOL_CAM, qw2w2)) {
return TM_QW2_HV_POOL;
}
/* OS ring */
if ((be32_to_cpu(qw1w2) & TM2_QW1W2_VO) &&
cam == xive_get_field32(TM2_QW1W2_OS_CAM, qw1w2)) {
return TM_QW1_OS;
}
} else {
/* F=1 : User level Event-Based Branch (EBB) notification */
/* USER ring */
if ((be32_to_cpu(qw1w2) & TM2_QW1W2_VO) &&
(cam == xive_get_field32(TM2_QW1W2_OS_CAM, qw1w2)) &&
(be32_to_cpu(qw0w2) & TM2_QW0W2_VU) &&
(logic_serv == xive_get_field32(TM2_QW0W2_LOGIC_SERV, qw0w2))) {
return TM_QW0_USER;
}
}
return -1;
}
static void xive2_router_realize(DeviceState *dev, Error **errp)
{
Xive2Router *xrtr = XIVE2_ROUTER(dev);
assert(xrtr->xfb);
}
/*
* Notification using the END ESe/ESn bit (Event State Buffer for
* escalation and notification). Profide futher coalescing in the
* Router.
*/
static bool xive2_router_end_es_notify(Xive2Router *xrtr, uint8_t end_blk,
uint32_t end_idx, Xive2End *end,
uint32_t end_esmask)
{
uint8_t pq = xive_get_field32(end_esmask, end->w1);
bool notify = xive_esb_trigger(&pq);
if (pq != xive_get_field32(end_esmask, end->w1)) {
end->w1 = xive_set_field32(end_esmask, end->w1, pq);
xive2_router_write_end(xrtr, end_blk, end_idx, end, 1);
}
/* ESe/n[Q]=1 : end of notification */
return notify;
}
/*
* An END trigger can come from an event trigger (IPI or HW) or from
* another chip. We don't model the PowerBus but the END trigger
* message has the same parameters than in the function below.
*/
static void xive2_router_end_notify(Xive2Router *xrtr, uint8_t end_blk,
uint32_t end_idx, uint32_t end_data)
{
Xive2End end;
uint8_t priority;
uint8_t format;
bool found;
Xive2Nvp nvp;
uint8_t nvp_blk;
uint32_t nvp_idx;
/* END cache lookup */
if (xive2_router_get_end(xrtr, end_blk, end_idx, &end)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: No END %x/%x\n", end_blk,
end_idx);
return;
}
if (!xive2_end_is_valid(&end)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: END %x/%x is invalid\n",
end_blk, end_idx);
return;
}
if (xive2_end_is_enqueue(&end)) {
xive2_end_enqueue(&end, end_data);
/* Enqueuing event data modifies the EQ toggle and index */
xive2_router_write_end(xrtr, end_blk, end_idx, &end, 1);
}
/*
* When the END is silent, we skip the notification part.
*/
if (xive2_end_is_silent_escalation(&end)) {
goto do_escalation;
}
/*
* The W7 format depends on the F bit in W6. It defines the type
* of the notification :
*
* F=0 : single or multiple NVP notification
* F=1 : User level Event-Based Branch (EBB) notification, no
* priority
*/
format = xive_get_field32(END2_W6_FORMAT_BIT, end.w6);
priority = xive_get_field32(END2_W7_F0_PRIORITY, end.w7);
/* The END is masked */
if (format == 0 && priority == 0xff) {
return;
}
/*
* Check the END ESn (Event State Buffer for notification) for
* even futher coalescing in the Router
*/
if (!xive2_end_is_notify(&end)) {
/* ESn[Q]=1 : end of notification */
if (!xive2_router_end_es_notify(xrtr, end_blk, end_idx,
&end, END2_W1_ESn)) {
return;
}
}
/*
* Follows IVPE notification
*/
nvp_blk = xive_get_field32(END2_W6_VP_BLOCK, end.w6);
nvp_idx = xive_get_field32(END2_W6_VP_OFFSET, end.w6);
/* NVP cache lookup */
if (xive2_router_get_nvp(xrtr, nvp_blk, nvp_idx, &nvp)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: no NVP %x/%x\n",
nvp_blk, nvp_idx);
return;
}
if (!xive2_nvp_is_valid(&nvp)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: NVP %x/%x is invalid\n",
nvp_blk, nvp_idx);
return;
}
found = xive_presenter_notify(xrtr->xfb, format, nvp_blk, nvp_idx,
xive_get_field32(END2_W6_IGNORE, end.w7),
priority,
xive_get_field32(END2_W7_F1_LOG_SERVER_ID, end.w7));
/* TODO: Auto EOI. */
if (found) {
return;
}
/*
* If no matching NVP is dispatched on a HW thread :
* - specific VP: update the NVP structure if backlog is activated
* - logical server : forward request to IVPE (not supported)
*/
if (xive2_end_is_backlog(&end)) {
uint8_t ipb;
if (format == 1) {
qemu_log_mask(LOG_GUEST_ERROR,
"XIVE: END %x/%x invalid config: F1 & backlog\n",
end_blk, end_idx);
return;
}
/*
* Record the IPB in the associated NVP structure for later
* use. The presenter will resend the interrupt when the vCPU
* is dispatched again on a HW thread.
*/
ipb = xive_get_field32(NVP2_W2_IPB, nvp.w2) |
xive_priority_to_ipb(priority);
nvp.w2 = xive_set_field32(NVP2_W2_IPB, nvp.w2, ipb);
xive2_router_write_nvp(xrtr, nvp_blk, nvp_idx, &nvp, 2);
/*
* On HW, follows a "Broadcast Backlog" to IVPEs
*/
}
do_escalation:
/*
* If activated, escalate notification using the ESe PQ bits and
* the EAS in w4-5
*/
if (!xive2_end_is_escalate(&end)) {
return;
}
/*
* Check the END ESe (Event State Buffer for escalation) for even
* futher coalescing in the Router
*/
if (!xive2_end_is_uncond_escalation(&end)) {
/* ESe[Q]=1 : end of escalation notification */
if (!xive2_router_end_es_notify(xrtr, end_blk, end_idx,
&end, END2_W1_ESe)) {
return;
}
}
/*
* The END trigger becomes an Escalation trigger
*/
xive2_router_end_notify(xrtr,
xive_get_field32(END2_W4_END_BLOCK, end.w4),
xive_get_field32(END2_W4_ESC_END_INDEX, end.w4),
xive_get_field32(END2_W5_ESC_END_DATA, end.w5));
}
void xive2_router_notify(XiveNotifier *xn, uint32_t lisn, bool pq_checked)
{
Xive2Router *xrtr = XIVE2_ROUTER(xn);
uint8_t eas_blk = XIVE_EAS_BLOCK(lisn);
uint32_t eas_idx = XIVE_EAS_INDEX(lisn);
Xive2Eas eas;
/* EAS cache lookup */
if (xive2_router_get_eas(xrtr, eas_blk, eas_idx, &eas)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Unknown LISN %x\n", lisn);
return;
}
if (!pq_checked) {
bool notify;
uint8_t pq;
/* PQ cache lookup */
if (xive2_router_get_pq(xrtr, eas_blk, eas_idx, &pq)) {
/* Set FIR */
g_assert_not_reached();
}
notify = xive_esb_trigger(&pq);
if (xive2_router_set_pq(xrtr, eas_blk, eas_idx, &pq)) {
/* Set FIR */
g_assert_not_reached();
}
if (!notify) {
return;
}
}
if (!xive2_eas_is_valid(&eas)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Invalid LISN %x\n", lisn);
return;
}
if (xive2_eas_is_masked(&eas)) {
/* Notification completed */
return;
}
/*
* The event trigger becomes an END trigger
*/
xive2_router_end_notify(xrtr,
xive_get_field64(EAS2_END_BLOCK, eas.w),
xive_get_field64(EAS2_END_INDEX, eas.w),
xive_get_field64(EAS2_END_DATA, eas.w));
}
static Property xive2_router_properties[] = {
DEFINE_PROP_LINK("xive-fabric", Xive2Router, xfb,
TYPE_XIVE_FABRIC, XiveFabric *),
DEFINE_PROP_END_OF_LIST(),
};
static void xive2_router_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
XiveNotifierClass *xnc = XIVE_NOTIFIER_CLASS(klass);
dc->desc = "XIVE2 Router Engine";
device_class_set_props(dc, xive2_router_properties);
/* Parent is SysBusDeviceClass. No need to call its realize hook */
dc->realize = xive2_router_realize;
xnc->notify = xive2_router_notify;
}
static const TypeInfo xive2_router_info = {
.name = TYPE_XIVE2_ROUTER,
.parent = TYPE_SYS_BUS_DEVICE,
.abstract = true,
.instance_size = sizeof(Xive2Router),
.class_size = sizeof(Xive2RouterClass),
.class_init = xive2_router_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_XIVE_NOTIFIER },
{ TYPE_XIVE_PRESENTER },
{ }
}
};
static inline bool addr_is_even(hwaddr addr, uint32_t shift)
{
return !((addr >> shift) & 1);
}
static uint64_t xive2_end_source_read(void *opaque, hwaddr addr, unsigned size)
{
Xive2EndSource *xsrc = XIVE2_END_SOURCE(opaque);
uint32_t offset = addr & 0xFFF;
uint8_t end_blk;
uint32_t end_idx;
Xive2End end;
uint32_t end_esmask;
uint8_t pq;
uint64_t ret;
/*
* The block id should be deduced from the load address on the END
* ESB MMIO but our model only supports a single block per XIVE chip.
*/
end_blk = xive2_router_get_block_id(xsrc->xrtr);
end_idx = addr >> (xsrc->esb_shift + 1);
if (xive2_router_get_end(xsrc->xrtr, end_blk, end_idx, &end)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: No END %x/%x\n", end_blk,
end_idx);
return -1;
}
if (!xive2_end_is_valid(&end)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: END %x/%x is invalid\n",
end_blk, end_idx);
return -1;
}
end_esmask = addr_is_even(addr, xsrc->esb_shift) ? END2_W1_ESn :
END2_W1_ESe;
pq = xive_get_field32(end_esmask, end.w1);
switch (offset) {
case XIVE_ESB_LOAD_EOI ... XIVE_ESB_LOAD_EOI + 0x7FF:
ret = xive_esb_eoi(&pq);
/* Forward the source event notification for routing ?? */
break;
case XIVE_ESB_GET ... XIVE_ESB_GET + 0x3FF:
ret = pq;
break;
case XIVE_ESB_SET_PQ_00 ... XIVE_ESB_SET_PQ_00 + 0x0FF:
case XIVE_ESB_SET_PQ_01 ... XIVE_ESB_SET_PQ_01 + 0x0FF:
case XIVE_ESB_SET_PQ_10 ... XIVE_ESB_SET_PQ_10 + 0x0FF:
case XIVE_ESB_SET_PQ_11 ... XIVE_ESB_SET_PQ_11 + 0x0FF:
ret = xive_esb_set(&pq, (offset >> 8) & 0x3);
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid END ESB load addr %d\n",
offset);
return -1;
}
if (pq != xive_get_field32(end_esmask, end.w1)) {
end.w1 = xive_set_field32(end_esmask, end.w1, pq);
xive2_router_write_end(xsrc->xrtr, end_blk, end_idx, &end, 1);
}
return ret;
}
static void xive2_end_source_write(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
Xive2EndSource *xsrc = XIVE2_END_SOURCE(opaque);
uint32_t offset = addr & 0xFFF;
uint8_t end_blk;
uint32_t end_idx;
Xive2End end;
uint32_t end_esmask;
uint8_t pq;
bool notify = false;
/*
* The block id should be deduced from the load address on the END
* ESB MMIO but our model only supports a single block per XIVE chip.
*/
end_blk = xive2_router_get_block_id(xsrc->xrtr);
end_idx = addr >> (xsrc->esb_shift + 1);
if (xive2_router_get_end(xsrc->xrtr, end_blk, end_idx, &end)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: No END %x/%x\n", end_blk,
end_idx);
return;
}
if (!xive2_end_is_valid(&end)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: END %x/%x is invalid\n",
end_blk, end_idx);
return;
}
end_esmask = addr_is_even(addr, xsrc->esb_shift) ? END2_W1_ESn :
END2_W1_ESe;
pq = xive_get_field32(end_esmask, end.w1);
switch (offset) {
case 0 ... 0x3FF:
notify = xive_esb_trigger(&pq);
break;
case XIVE_ESB_STORE_EOI ... XIVE_ESB_STORE_EOI + 0x3FF:
/* TODO: can we check StoreEOI availability from the router ? */
notify = xive_esb_eoi(&pq);
break;
case XIVE_ESB_INJECT ... XIVE_ESB_INJECT + 0x3FF:
if (end_esmask == END2_W1_ESe) {
qemu_log_mask(LOG_GUEST_ERROR,
"XIVE: END %x/%x can not EQ inject on ESe\n",
end_blk, end_idx);
return;
}
notify = true;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid END ESB write addr %d\n",
offset);
return;
}
if (pq != xive_get_field32(end_esmask, end.w1)) {
end.w1 = xive_set_field32(end_esmask, end.w1, pq);
xive2_router_write_end(xsrc->xrtr, end_blk, end_idx, &end, 1);
}
/* TODO: Forward the source event notification for routing */
if (notify) {
;
}
}
static const MemoryRegionOps xive2_end_source_ops = {
.read = xive2_end_source_read,
.write = xive2_end_source_write,
.endianness = DEVICE_BIG_ENDIAN,
.valid = {
.min_access_size = 8,
.max_access_size = 8,
},
.impl = {
.min_access_size = 8,
.max_access_size = 8,
},
};
static void xive2_end_source_realize(DeviceState *dev, Error **errp)
{
Xive2EndSource *xsrc = XIVE2_END_SOURCE(dev);
assert(xsrc->xrtr);
if (!xsrc->nr_ends) {
error_setg(errp, "Number of interrupt needs to be greater than 0");
return;
}
if (xsrc->esb_shift != XIVE_ESB_4K &&
xsrc->esb_shift != XIVE_ESB_64K) {
error_setg(errp, "Invalid ESB shift setting");
return;
}
/*
* Each END is assigned an even/odd pair of MMIO pages, the even page
* manages the ESn field while the odd page manages the ESe field.
*/
memory_region_init_io(&xsrc->esb_mmio, OBJECT(xsrc),
&xive2_end_source_ops, xsrc, "xive.end",
(1ull << (xsrc->esb_shift + 1)) * xsrc->nr_ends);
}
static Property xive2_end_source_properties[] = {
DEFINE_PROP_UINT32("nr-ends", Xive2EndSource, nr_ends, 0),
DEFINE_PROP_UINT32("shift", Xive2EndSource, esb_shift, XIVE_ESB_64K),
DEFINE_PROP_LINK("xive", Xive2EndSource, xrtr, TYPE_XIVE2_ROUTER,
Xive2Router *),
DEFINE_PROP_END_OF_LIST(),
};
static void xive2_end_source_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->desc = "XIVE END Source";
device_class_set_props(dc, xive2_end_source_properties);
dc->realize = xive2_end_source_realize;
dc->user_creatable = false;
}
static const TypeInfo xive2_end_source_info = {
.name = TYPE_XIVE2_END_SOURCE,
.parent = TYPE_DEVICE,
.instance_size = sizeof(Xive2EndSource),
.class_init = xive2_end_source_class_init,
};
static void xive2_register_types(void)
{
type_register_static(&xive2_router_info);
type_register_static(&xive2_end_source_info);
}
type_init(xive2_register_types)
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