diff options
Diffstat (limited to 'hw/intc/xive2.c')
| -rw-r--r-- | hw/intc/xive2.c | 690 |
1 files changed, 619 insertions, 71 deletions
diff --git a/hw/intc/xive2.c b/hw/intc/xive2.c index fc5aed3315..f8ef615487 100644 --- a/hw/intc/xive2.c +++ b/hw/intc/xive2.c @@ -1,10 +1,9 @@ /* * QEMU PowerPC XIVE2 interrupt controller model (POWER10) * - * Copyright (c) 2019-2022, IBM Corporation.. + * Copyright (c) 2019-2024, IBM Corporation.. * - * This code is licensed under the GPL version 2 or later. See the - * COPYING file in the top-level directory. + * SPDX-License-Identifier: GPL-2.0-or-later */ #include "qemu/osdep.h" @@ -18,6 +17,7 @@ #include "hw/ppc/xive.h" #include "hw/ppc/xive2.h" #include "hw/ppc/xive2_regs.h" +#include "trace.h" uint32_t xive2_router_get_config(Xive2Router *xrtr) { @@ -54,7 +54,8 @@ static uint32_t xive2_nvgc_get_backlog(Xive2Nvgc *nvgc, uint8_t priority) /* * The per-priority backlog counters are 24-bit and the structure - * is stored in big endian + * is stored in big endian. NVGC is 32-bytes long, so 24-bytes from + * w2, which fits 8 priorities * 24-bits per priority. */ ptr = (uint8_t *)&nvgc->w2 + priority * 3; for (i = 0; i < 3; i++, ptr++) { @@ -63,6 +64,117 @@ static uint32_t xive2_nvgc_get_backlog(Xive2Nvgc *nvgc, uint8_t priority) return val; } +static void xive2_nvgc_set_backlog(Xive2Nvgc *nvgc, uint8_t priority, + uint32_t val) +{ + uint8_t *ptr, i; + uint32_t shift; + + if (priority > 7) { + return; + } + + if (val > 0xFFFFFF) { + val = 0xFFFFFF; + } + /* + * The per-priority backlog counters are 24-bit and the structure + * is stored in big endian + */ + ptr = (uint8_t *)&nvgc->w2 + priority * 3; + for (i = 0; i < 3; i++, ptr++) { + shift = 8 * (2 - i); + *ptr = (val >> shift) & 0xFF; + } +} + +uint64_t xive2_presenter_nvgc_backlog_op(XivePresenter *xptr, + bool crowd, + uint8_t blk, uint32_t idx, + uint16_t offset, uint16_t val) +{ + Xive2Router *xrtr = XIVE2_ROUTER(xptr); + uint8_t priority = GETFIELD(NVx_BACKLOG_PRIO, offset); + uint8_t op = GETFIELD(NVx_BACKLOG_OP, offset); + Xive2Nvgc nvgc; + uint32_t count, old_count; + + if (xive2_router_get_nvgc(xrtr, crowd, blk, idx, &nvgc)) { + qemu_log_mask(LOG_GUEST_ERROR, "XIVE: No %s %x/%x\n", + crowd ? "NVC" : "NVG", blk, idx); + return -1; + } + if (!xive2_nvgc_is_valid(&nvgc)) { + qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Invalid NVG %x/%x\n", blk, idx); + return -1; + } + + old_count = xive2_nvgc_get_backlog(&nvgc, priority); + count = old_count; + /* + * op: + * 0b00 => increment + * 0b01 => decrement + * 0b1- => read + */ + if (op == 0b00 || op == 0b01) { + if (op == 0b00) { + count += val; + } else { + if (count > val) { + count -= val; + } else { + count = 0; + } + } + xive2_nvgc_set_backlog(&nvgc, priority, count); + xive2_router_write_nvgc(xrtr, crowd, blk, idx, &nvgc); + } + trace_xive_nvgc_backlog_op(crowd, blk, idx, op, priority, old_count); + return old_count; +} + +uint64_t xive2_presenter_nvp_backlog_op(XivePresenter *xptr, + uint8_t blk, uint32_t idx, + uint16_t offset) +{ + Xive2Router *xrtr = XIVE2_ROUTER(xptr); + uint8_t priority = GETFIELD(NVx_BACKLOG_PRIO, offset); + uint8_t op = GETFIELD(NVx_BACKLOG_OP, offset); + Xive2Nvp nvp; + uint8_t ipb, old_ipb, rc; + + if (xive2_router_get_nvp(xrtr, blk, idx, &nvp)) { + qemu_log_mask(LOG_GUEST_ERROR, "XIVE: No NVP %x/%x\n", blk, idx); + return -1; + } + if (!xive2_nvp_is_valid(&nvp)) { + qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Invalid NVP %x/%x\n", blk, idx); + return -1; + } + + old_ipb = xive_get_field32(NVP2_W2_IPB, nvp.w2); + ipb = old_ipb; + /* + * op: + * 0b00 => set priority bit + * 0b01 => reset priority bit + * 0b1- => read + */ + if (op == 0b00 || op == 0b01) { + if (op == 0b00) { + ipb |= xive_priority_to_ipb(priority); + } else { + ipb &= ~xive_priority_to_ipb(priority); + } + nvp.w2 = xive_set_field32(NVP2_W2_IPB, nvp.w2, ipb); + xive2_router_write_nvp(xrtr, blk, idx, &nvp, 2); + } + rc = !!(old_ipb & xive_priority_to_ipb(priority)); + trace_xive_nvp_backlog_op(blk, idx, op, priority, rc); + return rc; +} + void xive2_eas_pic_print_info(Xive2Eas *eas, uint32_t lisn, GString *buf) { if (!xive2_eas_is_valid(eas)) { @@ -114,8 +226,8 @@ void xive2_end_pic_print_info(Xive2End *end, uint32_t end_idx, GString *buf) 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); + uint32_t nvx_blk = xive_get_field32(END2_W6_VP_BLOCK, end->w6); + uint32_t nvx_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; @@ -144,7 +256,7 @@ void xive2_end_pic_print_info(Xive2End *end, uint32_t end_idx, GString *buf) xive2_end_is_firmware2(end) ? 'F' : '-', xive2_end_is_ignore(end) ? 'i' : '-', xive2_end_is_crowd(end) ? 'c' : '-', - priority, nvp_blk, nvp_idx); + priority, nvx_blk, nvx_idx); if (qaddr_base) { g_string_append_printf(buf, " eq:@%08"PRIx64"% 6d/%5d ^%d", @@ -255,6 +367,115 @@ static void xive2_end_enqueue(Xive2End *end, uint32_t data) end->w1 = xive_set_field32(END2_W1_PAGE_OFF, end->w1, qindex); } +static void xive2_pgofnext(uint8_t *nvgc_blk, uint32_t *nvgc_idx, + uint8_t next_level) +{ + uint32_t mask, next_idx; + uint8_t next_blk; + + /* + * Adjust the block and index of a VP for the next group/crowd + * size (PGofFirst/PGofNext field in the NVP and NVGC structures). + * + * The 6-bit group level is split into a 2-bit crowd and 4-bit + * group levels. Encoding is similar. However, we don't support + * crowd size of 8. So a crowd level of 0b11 is bumped to a crowd + * size of 16. + */ + next_blk = NVx_CROWD_LVL(next_level); + if (next_blk == 3) { + next_blk = 4; + } + mask = (1 << next_blk) - 1; + *nvgc_blk &= ~mask; + *nvgc_blk |= mask >> 1; + + next_idx = NVx_GROUP_LVL(next_level); + mask = (1 << next_idx) - 1; + *nvgc_idx &= ~mask; + *nvgc_idx |= mask >> 1; +} + +/* + * Scan the group chain and return the highest priority and group + * level of pending group interrupts. + */ +static uint8_t xive2_presenter_backlog_scan(XivePresenter *xptr, + uint8_t nvx_blk, uint32_t nvx_idx, + uint8_t first_group, + uint8_t *out_level) +{ + Xive2Router *xrtr = XIVE2_ROUTER(xptr); + uint32_t nvgc_idx; + uint32_t current_level, count; + uint8_t nvgc_blk, prio; + Xive2Nvgc nvgc; + + for (prio = 0; prio <= XIVE_PRIORITY_MAX; prio++) { + current_level = first_group & 0x3F; + nvgc_blk = nvx_blk; + nvgc_idx = nvx_idx; + + while (current_level) { + xive2_pgofnext(&nvgc_blk, &nvgc_idx, current_level); + + if (xive2_router_get_nvgc(xrtr, NVx_CROWD_LVL(current_level), + nvgc_blk, nvgc_idx, &nvgc)) { + qemu_log_mask(LOG_GUEST_ERROR, "XIVE: No NVGC %x/%x\n", + nvgc_blk, nvgc_idx); + return 0xFF; + } + if (!xive2_nvgc_is_valid(&nvgc)) { + qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Invalid NVGC %x/%x\n", + nvgc_blk, nvgc_idx); + return 0xFF; + } + + count = xive2_nvgc_get_backlog(&nvgc, prio); + if (count) { + *out_level = current_level; + return prio; + } + current_level = xive_get_field32(NVGC2_W0_PGONEXT, nvgc.w0) & 0x3F; + } + } + return 0xFF; +} + +static void xive2_presenter_backlog_decr(XivePresenter *xptr, + uint8_t nvx_blk, uint32_t nvx_idx, + uint8_t group_prio, + uint8_t group_level) +{ + Xive2Router *xrtr = XIVE2_ROUTER(xptr); + uint32_t nvgc_idx, count; + uint8_t nvgc_blk; + Xive2Nvgc nvgc; + + nvgc_blk = nvx_blk; + nvgc_idx = nvx_idx; + xive2_pgofnext(&nvgc_blk, &nvgc_idx, group_level); + + if (xive2_router_get_nvgc(xrtr, NVx_CROWD_LVL(group_level), + nvgc_blk, nvgc_idx, &nvgc)) { + qemu_log_mask(LOG_GUEST_ERROR, "XIVE: No NVGC %x/%x\n", + nvgc_blk, nvgc_idx); + return; + } + if (!xive2_nvgc_is_valid(&nvgc)) { + qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Invalid NVGC %x/%x\n", + nvgc_blk, nvgc_idx); + return; + } + count = xive2_nvgc_get_backlog(&nvgc, group_prio); + if (!count) { + return; + } + xive2_nvgc_set_backlog(&nvgc, group_prio, count - 1); + xive2_router_write_nvgc(xrtr, NVx_CROWD_LVL(group_level), + nvgc_blk, nvgc_idx, &nvgc); +} + /* * XIVE Thread Interrupt Management Area (TIMA) - Gen2 mode * @@ -313,7 +534,19 @@ static void xive2_tctx_save_ctx(Xive2Router *xrtr, XiveTCTX *tctx, 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]); + if (nvp.w0 & NVP2_W0_L) { + /* + * Typically not used. If LSMFB is restored with 0, it will + * force a backlog rescan + */ + nvp.w2 = xive_set_field32(NVP2_W2_LSMFB, nvp.w2, regs[TM_LSMFB]); + } + if (nvp.w0 & NVP2_W0_G) { + nvp.w2 = xive_set_field32(NVP2_W2_LGS, nvp.w2, regs[TM_LGS]); + } + if (nvp.w0 & NVP2_W0_T) { + nvp.w2 = xive_set_field32(NVP2_W2_T, nvp.w2, regs[TM_T]); + } xive2_router_write_nvp(xrtr, nvp_blk, nvp_idx, &nvp, 2); nvp.w1 = xive_set_field32(NVP2_W1_CO, nvp.w1, 0); @@ -527,7 +760,9 @@ static uint8_t xive2_tctx_restore_os_ctx(Xive2Router *xrtr, XiveTCTX *tctx, xive2_router_write_nvp(xrtr, nvp_blk, nvp_idx, nvp, 2); tctx->regs[TM_QW1_OS + TM_CPPR] = cppr; - /* we don't model LSMFB */ + tctx->regs[TM_QW1_OS + TM_LSMFB] = xive_get_field32(NVP2_W2_LSMFB, nvp->w2); + tctx->regs[TM_QW1_OS + TM_LGS] = xive_get_field32(NVP2_W2_LGS, nvp->w2); + tctx->regs[TM_QW1_OS + TM_T] = xive_get_field32(NVP2_W2_T, nvp->w2); nvp->w1 = xive_set_field32(NVP2_W1_CO, nvp->w1, 1); nvp->w1 = xive_set_field32(NVP2_W1_CO_THRID_VALID, nvp->w1, 1); @@ -550,8 +785,15 @@ static void xive2_tctx_need_resend(Xive2Router *xrtr, XiveTCTX *tctx, uint8_t nvp_blk, uint32_t nvp_idx, bool do_restore) { - Xive2Nvp nvp; + XivePresenter *xptr = XIVE_PRESENTER(xrtr); uint8_t ipb; + uint8_t backlog_level; + uint8_t group_level; + uint8_t first_group; + uint8_t backlog_prio; + uint8_t group_prio; + uint8_t *regs = &tctx->regs[TM_QW1_OS]; + Xive2Nvp nvp; /* * Grab the associated thread interrupt context registers in the @@ -580,15 +822,29 @@ static void xive2_tctx_need_resend(Xive2Router *xrtr, XiveTCTX *tctx, nvp.w2 = xive_set_field32(NVP2_W2_IPB, nvp.w2, 0); xive2_router_write_nvp(xrtr, nvp_blk, nvp_idx, &nvp, 2); } + regs[TM_IPB] |= ipb; + backlog_prio = xive_ipb_to_pipr(ipb); + backlog_level = 0; + + first_group = xive_get_field32(NVP2_W0_PGOFIRST, nvp.w0); + if (first_group && regs[TM_LSMFB] < backlog_prio) { + group_prio = xive2_presenter_backlog_scan(xptr, nvp_blk, nvp_idx, + first_group, &group_level); + regs[TM_LSMFB] = group_prio; + if (regs[TM_LGS] && group_prio < backlog_prio) { + /* VP can take a group interrupt */ + xive2_presenter_backlog_decr(xptr, nvp_blk, nvp_idx, + group_prio, group_level); + backlog_prio = group_prio; + backlog_level = group_level; + } + } + /* - * 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. + * Compute the PIPR based on the restored state. + * It will raise the External interrupt signal if needed. */ - xive_tctx_ipb_update(tctx, TM_QW1_OS, ipb); + xive_tctx_pipr_update(tctx, TM_QW1_OS, backlog_prio, backlog_level); } /* @@ -630,6 +886,172 @@ void xive2_tm_push_os_ctx(XivePresenter *xptr, XiveTCTX *tctx, } } +static int xive2_tctx_get_nvp_indexes(XiveTCTX *tctx, uint8_t ring, + uint32_t *nvp_blk, uint32_t *nvp_idx) +{ + uint32_t w2, cam; + + w2 = xive_tctx_word2(&tctx->regs[ring]); + switch (ring) { + case TM_QW1_OS: + if (!(be32_to_cpu(w2) & TM2_QW1W2_VO)) { + return -1; + } + cam = xive_get_field32(TM2_QW1W2_OS_CAM, w2); + break; + case TM_QW2_HV_POOL: + if (!(be32_to_cpu(w2) & TM2_QW2W2_VP)) { + return -1; + } + cam = xive_get_field32(TM2_QW2W2_POOL_CAM, w2); + break; + case TM_QW3_HV_PHYS: + if (!(be32_to_cpu(w2) & TM2_QW3W2_VT)) { + return -1; + } + cam = xive2_tctx_hw_cam_line(tctx->xptr, tctx); + break; + default: + return -1; + } + *nvp_blk = xive2_nvp_blk(cam); + *nvp_idx = xive2_nvp_idx(cam); + return 0; +} + +static void xive2_tctx_set_cppr(XiveTCTX *tctx, uint8_t ring, uint8_t cppr) +{ + uint8_t *regs = &tctx->regs[ring]; + Xive2Router *xrtr = XIVE2_ROUTER(tctx->xptr); + uint8_t old_cppr, backlog_prio, first_group, group_level = 0; + uint8_t pipr_min, lsmfb_min, ring_min; + bool group_enabled; + uint32_t nvp_blk, nvp_idx; + Xive2Nvp nvp; + int rc; + + trace_xive_tctx_set_cppr(tctx->cs->cpu_index, ring, + regs[TM_IPB], regs[TM_PIPR], + cppr, regs[TM_NSR]); + + if (cppr > XIVE_PRIORITY_MAX) { + cppr = 0xff; + } + + old_cppr = regs[TM_CPPR]; + regs[TM_CPPR] = cppr; + + /* + * Recompute the PIPR based on local pending interrupts. It will + * be adjusted below if needed in case of pending group interrupts. + */ + pipr_min = xive_ipb_to_pipr(regs[TM_IPB]); + group_enabled = !!regs[TM_LGS]; + lsmfb_min = (group_enabled) ? regs[TM_LSMFB] : 0xff; + ring_min = ring; + + /* PHYS updates also depend on POOL values */ + if (ring == TM_QW3_HV_PHYS) { + uint8_t *pregs = &tctx->regs[TM_QW2_HV_POOL]; + + /* POOL values only matter if POOL ctx is valid */ + if (pregs[TM_WORD2] & 0x80) { + + uint8_t pool_pipr = xive_ipb_to_pipr(pregs[TM_IPB]); + uint8_t pool_lsmfb = pregs[TM_LSMFB]; + + /* + * Determine highest priority interrupt and + * remember which ring has it. + */ + if (pool_pipr < pipr_min) { + pipr_min = pool_pipr; + if (pool_pipr < lsmfb_min) { + ring_min = TM_QW2_HV_POOL; + } + } + + /* Values needed for group priority calculation */ + if (pregs[TM_LGS] && (pool_lsmfb < lsmfb_min)) { + group_enabled = true; + lsmfb_min = pool_lsmfb; + if (lsmfb_min < pipr_min) { + ring_min = TM_QW2_HV_POOL; + } + } + } + } + regs[TM_PIPR] = pipr_min; + + rc = xive2_tctx_get_nvp_indexes(tctx, ring_min, &nvp_blk, &nvp_idx); + if (rc) { + qemu_log_mask(LOG_GUEST_ERROR, "XIVE: set CPPR on invalid context\n"); + return; + } + + if (cppr < old_cppr) { + /* + * FIXME: check if there's a group interrupt being presented + * and if the new cppr prevents it. If so, then the group + * interrupt needs to be re-added to the backlog and + * re-triggered (see re-trigger END info in the NVGC + * structure) + */ + } + + if (group_enabled && + lsmfb_min < cppr && + lsmfb_min < regs[TM_PIPR]) { + /* + * Thread has seen a group interrupt with a higher priority + * than the new cppr or pending local interrupt. Check the + * backlog + */ + 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; + } + + first_group = xive_get_field32(NVP2_W0_PGOFIRST, nvp.w0); + if (!first_group) { + qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid NVP %x/%x\n", + nvp_blk, nvp_idx); + return; + } + + backlog_prio = xive2_presenter_backlog_scan(tctx->xptr, + nvp_blk, nvp_idx, + first_group, &group_level); + tctx->regs[ring_min + TM_LSMFB] = backlog_prio; + if (backlog_prio != 0xFF) { + xive2_presenter_backlog_decr(tctx->xptr, nvp_blk, nvp_idx, + backlog_prio, group_level); + regs[TM_PIPR] = backlog_prio; + } + } + /* CPPR has changed, check if we need to raise a pending exception */ + xive_tctx_notify(tctx, ring_min, group_level); +} + +void xive2_tm_set_hv_cppr(XivePresenter *xptr, XiveTCTX *tctx, + hwaddr offset, uint64_t value, unsigned size) +{ + xive2_tctx_set_cppr(tctx, TM_QW3_HV_PHYS, value & 0xff); +} + +void xive2_tm_set_os_cppr(XivePresenter *xptr, XiveTCTX *tctx, + hwaddr offset, uint64_t value, unsigned size) +{ + xive2_tctx_set_cppr(tctx, TM_QW1_OS, value & 0xff); +} + static void xive2_tctx_set_target(XiveTCTX *tctx, uint8_t ring, uint8_t target) { uint8_t *regs = &tctx->regs[ring]; @@ -723,13 +1145,46 @@ int xive2_router_write_nvgc(Xive2Router *xrtr, bool crowd, return xrc->write_nvgc(xrtr, crowd, nvgc_blk, nvgc_idx, nvgc); } +static bool xive2_vp_match_mask(uint32_t cam1, uint32_t cam2, + uint32_t vp_mask) +{ + return (cam1 & vp_mask) == (cam2 & vp_mask); +} + +static uint8_t xive2_get_vp_block_mask(uint32_t nvt_blk, bool crowd) +{ + uint8_t size, block_mask = 0b1111; + + /* 3 supported crowd sizes: 2, 4, 16 */ + if (crowd) { + size = xive_get_vpgroup_size(nvt_blk); + if (size == 8) { + qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Invalid crowd size of 8n"); + return block_mask; + } + block_mask &= ~(size - 1); + } + return block_mask; +} + +static uint32_t xive2_get_vp_index_mask(uint32_t nvt_index, bool cam_ignore) +{ + uint32_t index_mask = 0xFFFFFF; /* 24 bits */ + + if (cam_ignore) { + index_mask &= ~(xive_get_vpgroup_size(nvt_index) - 1); + } + return index_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) + bool crowd, 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]); @@ -737,44 +1192,51 @@ int xive2_presenter_tctx_match(XivePresenter *xptr, XiveTCTX *tctx, 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. - */ + uint32_t index_mask, vp_mask; + uint8_t block_mask; 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; - } + /* + * i=0: Specific NVT notification + * i=1: VP-group notification (bits ignored at the end of the + * NVT identifier) + */ + block_mask = xive2_get_vp_block_mask(nvt_blk, crowd); + index_mask = xive2_get_vp_index_mask(nvt_idx, cam_ignore); + vp_mask = xive2_nvp_cam_line(block_mask, index_mask); - /* F=0 & i=0: Specific NVT notification */ + /* For VP-group notifications, threads with LGS=0 are excluded */ /* PHYS ring */ if ((be32_to_cpu(qw3w2) & TM2_QW3W2_VT) && - cam == xive2_tctx_hw_cam_line(xptr, tctx)) { + !(cam_ignore && tctx->regs[TM_QW3_HV_PHYS + TM_LGS] == 0) && + xive2_vp_match_mask(cam, + xive2_tctx_hw_cam_line(xptr, tctx), + vp_mask)) { 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)) { + !(cam_ignore && tctx->regs[TM_QW2_HV_POOL + TM_LGS] == 0) && + xive2_vp_match_mask(cam, + xive_get_field32(TM2_QW2W2_POOL_CAM, qw2w2), + vp_mask)) { return TM_QW2_HV_POOL; } /* OS ring */ if ((be32_to_cpu(qw1w2) & TM2_QW1W2_VO) && - cam == xive_get_field32(TM2_QW1W2_OS_CAM, qw1w2)) { + !(cam_ignore && tctx->regs[TM_QW1_OS + TM_LGS] == 0) && + xive2_vp_match_mask(cam, + xive_get_field32(TM2_QW1W2_OS_CAM, qw1w2), + vp_mask)) { return TM_QW1_OS; } } else { /* F=1 : User level Event-Based Branch (EBB) notification */ + /* FIXME: what if cam_ignore and LGS = 0 ? */ /* USER ring */ if ((be32_to_cpu(qw1w2) & TM2_QW1W2_VO) && (cam == xive_get_field32(TM2_QW1W2_OS_CAM, qw1w2)) && @@ -786,6 +1248,37 @@ int xive2_presenter_tctx_match(XivePresenter *xptr, XiveTCTX *tctx, return -1; } +bool xive2_tm_irq_precluded(XiveTCTX *tctx, int ring, uint8_t priority) +{ + /* HV_POOL ring uses HV_PHYS NSR, CPPR and PIPR registers */ + uint8_t alt_ring = (ring == TM_QW2_HV_POOL) ? TM_QW3_HV_PHYS : ring; + uint8_t *alt_regs = &tctx->regs[alt_ring]; + + /* + * The xive2_presenter_tctx_match() above tells if there's a match + * but for VP-group notification, we still need to look at the + * priority to know if the thread can take the interrupt now or if + * it is precluded. + */ + if (priority < alt_regs[TM_CPPR]) { + return false; + } + return true; +} + +void xive2_tm_set_lsmfb(XiveTCTX *tctx, int ring, uint8_t priority) +{ + uint8_t *regs = &tctx->regs[ring]; + + /* + * Called by the router during a VP-group notification when the + * thread matches but can't take the interrupt because it's + * already running at a more favored priority. It then stores the + * new interrupt priority in the LSMFB field. + */ + regs[TM_LSMFB] = priority; +} + static void xive2_router_realize(DeviceState *dev, Error **errp) { Xive2Router *xrtr = XIVE2_ROUTER(dev); @@ -825,10 +1318,9 @@ static void xive2_router_end_notify(Xive2Router *xrtr, uint8_t end_blk, Xive2End end; uint8_t priority; uint8_t format; - bool found; - Xive2Nvp nvp; - uint8_t nvp_blk; - uint32_t nvp_idx; + bool found, precluded; + uint8_t nvx_blk; + uint32_t nvx_idx; /* END cache lookup */ if (xive2_router_get_end(xrtr, end_blk, end_idx, &end)) { @@ -843,6 +1335,12 @@ static void xive2_router_end_notify(Xive2Router *xrtr, uint8_t end_blk, return; } + if (xive2_end_is_crowd(&end) & !xive2_end_is_ignore(&end)) { + qemu_log_mask(LOG_GUEST_ERROR, + "XIVE: invalid END, 'crowd' bit requires 'ignore' bit\n"); + return; + } + if (xive2_end_is_enqueue(&end)) { xive2_end_enqueue(&end, end_data); /* Enqueuing event data modifies the EQ toggle and index */ @@ -887,26 +1385,14 @@ static void xive2_router_end_notify(Xive2Router *xrtr, uint8_t end_blk, /* * 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); + nvx_blk = xive_get_field32(END2_W6_VP_BLOCK, end.w6); + nvx_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, - xive2_end_is_ignore(&end), + found = xive_presenter_notify(xrtr->xfb, format, nvx_blk, nvx_idx, + xive2_end_is_crowd(&end), xive2_end_is_ignore(&end), priority, - xive_get_field32(END2_W7_F1_LOG_SERVER_ID, end.w7)); + xive_get_field32(END2_W7_F1_LOG_SERVER_ID, end.w7), + &precluded); /* TODO: Auto EOI. */ @@ -917,10 +1403,9 @@ static void xive2_router_end_notify(Xive2Router *xrtr, uint8_t end_blk, /* * 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) + * - VP-group: update the backlog counter for that priority in the NVG */ if (xive2_end_is_backlog(&end)) { - uint8_t ipb; if (format == 1) { qemu_log_mask(LOG_GUEST_ERROR, @@ -929,19 +1414,82 @@ static void xive2_router_end_notify(Xive2Router *xrtr, uint8_t end_blk, 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); + if (!xive2_end_is_ignore(&end)) { + uint8_t ipb; + Xive2Nvp nvp; - /* - * On HW, follows a "Broadcast Backlog" to IVPEs - */ + /* NVP cache lookup */ + if (xive2_router_get_nvp(xrtr, nvx_blk, nvx_idx, &nvp)) { + qemu_log_mask(LOG_GUEST_ERROR, "XIVE: no NVP %x/%x\n", + nvx_blk, nvx_idx); + return; + } + + if (!xive2_nvp_is_valid(&nvp)) { + qemu_log_mask(LOG_GUEST_ERROR, "XIVE: NVP %x/%x is invalid\n", + nvx_blk, nvx_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, nvx_blk, nvx_idx, &nvp, 2); + } else { + Xive2Nvgc nvgc; + uint32_t backlog; + bool crowd; + + crowd = xive2_end_is_crowd(&end); + + /* + * For groups and crowds, the per-priority backlog + * counters are stored in the NVG/NVC structures + */ + if (xive2_router_get_nvgc(xrtr, crowd, + nvx_blk, nvx_idx, &nvgc)) { + qemu_log_mask(LOG_GUEST_ERROR, "XIVE: no %s %x/%x\n", + crowd ? "NVC" : "NVG", nvx_blk, nvx_idx); + return; + } + + if (!xive2_nvgc_is_valid(&nvgc)) { + qemu_log_mask(LOG_GUEST_ERROR, "XIVE: NVG %x/%x is invalid\n", + nvx_blk, nvx_idx); + return; + } + + /* + * Increment the backlog counter for that priority. + * We only call broadcast the first time the counter is + * incremented. broadcast will set the LSMFB field of the TIMA of + * relevant threads so that they know an interrupt is pending. + */ + backlog = xive2_nvgc_get_backlog(&nvgc, priority) + 1; + xive2_nvgc_set_backlog(&nvgc, priority, backlog); + xive2_router_write_nvgc(xrtr, crowd, nvx_blk, nvx_idx, &nvgc); + + if (backlog == 1) { + XiveFabricClass *xfc = XIVE_FABRIC_GET_CLASS(xrtr->xfb); + xfc->broadcast(xrtr->xfb, nvx_blk, nvx_idx, + xive2_end_is_crowd(&end), + xive2_end_is_ignore(&end), + priority); + + if (!xive2_end_is_precluded_escalation(&end)) { + /* + * The interrupt will be picked up when the + * matching thread lowers its priority level + */ + return; + } + } + } } do_escalation: |