Index: head/sys/riscv/riscv/plic.c =================================================================== --- head/sys/riscv/riscv/plic.c (revision 354716) +++ head/sys/riscv/riscv/plic.c (revision 354717) @@ -1,299 +1,425 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2018 Ruslan Bukin * All rights reserved. * * This software was developed by SRI International and the University of * Cambridge Computer Laboratory (Department of Computer Science and * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the * DARPA SSITH research programme. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include +#include #include #include #include #include #include #include "pic_if.h" #define PLIC_MAX_IRQS 1024 -#define PLIC_PRIORITY(n) (0x000000 + (n) * 0x4) -#define PLIC_ENABLE(n, h) (0x002000 + (h) * 0x80 + 4 * ((n) / 32)) -#define PLIC_THRESHOLD(h) (0x200000 + (h) * 0x1000 + 0x0) -#define PLIC_CLAIM(h) (0x200000 + (h) * 0x1000 + 0x4) +#define PLIC_PRIORITY_BASE 0x000000U + +#define PLIC_ENABLE_BASE 0x002000U +#define PLIC_ENABLE_STRIDE 0x80U + +#define PLIC_CONTEXT_BASE 0x200000U +#define PLIC_CONTEXT_STRIDE 0x1000U +#define PLIC_CONTEXT_THRESHOLD 0x0U +#define PLIC_CONTEXT_CLAIM 0x4U + +#define PLIC_PRIORITY(n) (PLIC_PRIORITY_BASE + (n) * sizeof(uint32_t)) +#define PLIC_ENABLE(sc, n, h) \ + (sc->contexts[h].enable_offset + ((n) / 32) * sizeof(uint32_t)) +#define PLIC_THRESHOLD(sc, h) \ + (sc->contexts[h].context_offset + PLIC_CONTEXT_THRESHOLD) +#define PLIC_CLAIM(sc, h) \ + (sc->contexts[h].context_offset + PLIC_CONTEXT_CLAIM) + struct plic_irqsrc { struct intr_irqsrc isrc; u_int irq; }; +struct plic_context { + bus_size_t enable_offset; + bus_size_t context_offset; +}; + struct plic_softc { device_t dev; struct resource * intc_res; struct plic_irqsrc isrcs[PLIC_MAX_IRQS]; + struct plic_context contexts[MAXCPU]; int ndev; }; #define RD4(sc, reg) \ bus_read_4(sc->intc_res, (reg)) #define WR4(sc, reg, val) \ bus_write_4(sc->intc_res, (reg), (val)) +static int +riscv_hartid_to_cpu(int hartid) +{ + int i; + + CPU_FOREACH(i) { + if (pcpu_find(i)->pc_hart == hartid) + return (i); + } + + return (-1); +} + +static int +plic_get_hartid(device_t dev, phandle_t intc) +{ + int hart; + + /* Check the interrupt controller layout. */ + if (OF_searchencprop(intc, "#interrupt-cells", &hart, + sizeof(hart)) == -1) { + device_printf(dev, + "Could not find #interrupt-cells for phandle %u\n", intc); + return (-1); + } + + /* + * The parent of the interrupt-controller is the CPU we are + * interested in, so search for its hart ID. + */ + if (OF_searchencprop(OF_parent(intc), "reg", (pcell_t *)&hart, + sizeof(hart)) == -1) { + device_printf(dev, "Could not find hartid\n"); + return (-1); + } + + return (hart); +} + static inline void plic_irq_dispatch(struct plic_softc *sc, u_int irq, struct trapframe *tf) { struct plic_irqsrc *src; src = &sc->isrcs[irq]; if (intr_isrc_dispatch(&src->isrc, tf) != 0) device_printf(sc->dev, "Stray irq %u detected\n", irq); } static int plic_intr(void *arg) { struct plic_softc *sc; struct trapframe *tf; uint32_t pending; uint32_t cpu; sc = arg; cpu = PCPU_GET(cpuid); - pending = RD4(sc, PLIC_CLAIM(cpu)); + pending = RD4(sc, PLIC_CLAIM(sc, cpu)); if (pending) { tf = curthread->td_intr_frame; plic_irq_dispatch(sc, pending, tf); - WR4(sc, PLIC_CLAIM(cpu), pending); + WR4(sc, PLIC_CLAIM(sc, cpu), pending); } return (FILTER_HANDLED); } static void plic_disable_intr(device_t dev, struct intr_irqsrc *isrc) { struct plic_softc *sc; struct plic_irqsrc *src; uint32_t reg; uint32_t cpu; sc = device_get_softc(dev); src = (struct plic_irqsrc *)isrc; cpu = PCPU_GET(cpuid); - reg = RD4(sc, PLIC_ENABLE(src->irq, cpu)); + reg = RD4(sc, PLIC_ENABLE(sc, src->irq, cpu)); reg &= ~(1 << (src->irq % 32)); - WR4(sc, PLIC_ENABLE(src->irq, cpu), reg); + WR4(sc, PLIC_ENABLE(sc, src->irq, cpu), reg); } static void plic_enable_intr(device_t dev, struct intr_irqsrc *isrc) { struct plic_softc *sc; struct plic_irqsrc *src; uint32_t reg; uint32_t cpu; sc = device_get_softc(dev); src = (struct plic_irqsrc *)isrc; WR4(sc, PLIC_PRIORITY(src->irq), 1); cpu = PCPU_GET(cpuid); - reg = RD4(sc, PLIC_ENABLE(src->irq, cpu)); + reg = RD4(sc, PLIC_ENABLE(sc, src->irq, cpu)); reg |= (1 << (src->irq % 32)); - WR4(sc, PLIC_ENABLE(src->irq, cpu), reg); + WR4(sc, PLIC_ENABLE(sc, src->irq, cpu), reg); } static int plic_map_intr(device_t dev, struct intr_map_data *data, struct intr_irqsrc **isrcp) { struct intr_map_data_fdt *daf; struct plic_softc *sc; sc = device_get_softc(dev); if (data->type != INTR_MAP_DATA_FDT) return (ENOTSUP); daf = (struct intr_map_data_fdt *)data; if (daf->ncells != 1 || daf->cells[0] > sc->ndev) return (EINVAL); *isrcp = &sc->isrcs[daf->cells[0]].isrc; return (0); } static int plic_probe(device_t dev) { if (!ofw_bus_status_okay(dev)) return (ENXIO); if (!ofw_bus_is_compatible(dev, "riscv,plic0") && !ofw_bus_is_compatible(dev, "sifive,plic-1.0.0")) return (ENXIO); device_set_desc(dev, "RISC-V PLIC"); return (BUS_PROBE_DEFAULT); } static int plic_attach(device_t dev) { struct plic_irqsrc *isrcs; struct plic_softc *sc; struct intr_pic *pic; + pcell_t *cells; uint32_t irq; const char *name; phandle_t node; phandle_t xref; uint32_t cpu; int error; int rid; + int nintr; + int context; + int i; + int hart; sc = device_get_softc(dev); sc->dev = dev; node = ofw_bus_get_node(dev); if ((OF_getencprop(node, "riscv,ndev", &sc->ndev, sizeof(sc->ndev))) < 0) { device_printf(dev, "Error: could not get number of devices\n"); return (ENXIO); } if (sc->ndev >= PLIC_MAX_IRQS) { device_printf(dev, "Error: invalid ndev (%d)\n", sc->ndev); return (ENXIO); } /* Request memory resources */ rid = 0; sc->intc_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); if (sc->intc_res == NULL) { device_printf(dev, "Error: could not allocate memory resources\n"); return (ENXIO); } + /* Register the interrupt sources */ isrcs = sc->isrcs; name = device_get_nameunit(sc->dev); cpu = PCPU_GET(cpuid); for (irq = 1; irq <= sc->ndev; irq++) { isrcs[irq].irq = irq; error = intr_isrc_register(&isrcs[irq].isrc, sc->dev, 0, "%s,%u", name, irq); if (error != 0) return (error); WR4(sc, PLIC_PRIORITY(irq), 0); - WR4(sc, PLIC_ENABLE(irq, cpu), 0); } - WR4(sc, PLIC_THRESHOLD(cpu), 0); + + /* + * Calculate the per-cpu enable and context register offsets. + * + * This is tricky for a few reasons. The PLIC divides the interrupt + * enable, threshold, and claim bits by "context", where each context + * routes to a Core-Local Interrupt Controller (CLIC). + * + * The tricky part is that the PLIC spec imposes no restrictions on how + * these contexts are laid out. So for example, there is no guarantee + * that each CPU will have both a machine mode and supervisor context, + * or that different PLIC implementations will organize the context + * registers in the same way. On top of this, we must handle the fact + * that cpuid != hartid, as they may have been renumbered during boot. + * We perform the following steps: + * + * 1. Examine the PLIC's "interrupts-extended" property and skip any + * entries that are not for supervisor external interrupts. + * + * 2. Walk up the device tree to find the corresponding CPU, and grab + * it's hart ID. + * + * 3. Convert the hart to a cpuid, and calculate the register offsets + * based on the context number. + */ + nintr = OF_getencprop_alloc_multi(node, "interrupts-extended", + sizeof(uint32_t), (void **)&cells); + if (nintr <= 0) { + device_printf(dev, "Could not read interrupts-extended\n"); + return (ENXIO); + } + + /* interrupts-extended is a list of phandles and interrupt types. */ + for (i = 0, context = 0; i < nintr; i += 2, context++) { + /* Skip M-mode external interrupts */ + if (cells[i + 1] != IRQ_EXTERNAL_SUPERVISOR) + continue; + + /* Get the hart ID from the CLIC's phandle. */ + hart = plic_get_hartid(dev, OF_node_from_xref(cells[i])); + if (hart < 0) { + OF_prop_free(cells); + return (ENXIO); + } + + /* Get the corresponding cpuid. */ + cpu = riscv_hartid_to_cpu(hart); + if (cpu < 0) { + device_printf(dev, "Invalid hart!\n"); + OF_prop_free(cells); + return (ENXIO); + } + + /* Set the enable and context register offsets for the CPU. */ + sc->contexts[cpu].enable_offset = PLIC_ENABLE_BASE + + context * PLIC_ENABLE_STRIDE; + sc->contexts[cpu].context_offset = PLIC_CONTEXT_BASE + + context * PLIC_CONTEXT_STRIDE; + } + OF_prop_free(cells); + + WR4(sc, PLIC_THRESHOLD(sc, cpu), 0); xref = OF_xref_from_node(node); pic = intr_pic_register(sc->dev, xref); if (pic == NULL) return (ENXIO); csr_set(sie, SIE_SEIE); return (intr_pic_claim_root(sc->dev, xref, plic_intr, sc, 0)); } static void plic_pre_ithread(device_t dev, struct intr_irqsrc *isrc) { struct plic_softc *sc; struct plic_irqsrc *src; sc = device_get_softc(dev); src = (struct plic_irqsrc *)isrc; WR4(sc, PLIC_PRIORITY(src->irq), 0); } static void plic_post_ithread(device_t dev, struct intr_irqsrc *isrc) { struct plic_softc *sc; struct plic_irqsrc *src; sc = device_get_softc(dev); src = (struct plic_irqsrc *)isrc; WR4(sc, PLIC_PRIORITY(src->irq), 1); } static device_method_t plic_methods[] = { DEVMETHOD(device_probe, plic_probe), DEVMETHOD(device_attach, plic_attach), DEVMETHOD(pic_disable_intr, plic_disable_intr), DEVMETHOD(pic_enable_intr, plic_enable_intr), DEVMETHOD(pic_map_intr, plic_map_intr), DEVMETHOD(pic_pre_ithread, plic_pre_ithread), DEVMETHOD(pic_post_ithread, plic_post_ithread), DEVMETHOD_END }; static driver_t plic_driver = { "plic", plic_methods, sizeof(struct plic_softc), }; static devclass_t plic_devclass; EARLY_DRIVER_MODULE(plic, simplebus, plic_driver, plic_devclass, 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);