From ff871d0462d0a7ebdbfadf8c8d6c3726af507f0a Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Wed, 14 Jun 2023 22:56:24 +0000 Subject: hw/pci-host/gpex: Allow more than 4 legacy IRQs MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Some boards such as vmapple don't do real legacy PCI IRQ swizzling. Instead, they just keep allocating more board IRQ lines for each new legacy IRQ. Let's support that mode by giving instantiators a new "nr_irqs" property they can use to support more than 4 legacy IRQ lines. In this mode, GPEX will export more IRQ lines, one for each device. Signed-off-by: Alexander Graf Signed-off-by: Phil Dennis-Jordan Reviewed-by: Akihiko Odaki Tested-by: Akihiko Odaki Reviewed-by: Philippe Mathieu-Daudé Message-ID: <20241223221645.29911-9-phil@philjordan.eu> Signed-off-by: Philippe Mathieu-Daudé --- hw/pci-host/gpex.c | 43 ++++++++++++++++++++++++++++++++++--------- 1 file changed, 34 insertions(+), 9 deletions(-) (limited to 'hw/pci-host/gpex.c') diff --git a/hw/pci-host/gpex.c b/hw/pci-host/gpex.c index c6aa8e87a2..9fcedd7fc5 100644 --- a/hw/pci-host/gpex.c +++ b/hw/pci-host/gpex.c @@ -32,6 +32,7 @@ #include "qemu/osdep.h" #include "qapi/error.h" #include "hw/irq.h" +#include "hw/pci/pci_bus.h" #include "hw/pci-host/gpex.h" #include "hw/qdev-properties.h" #include "migration/vmstate.h" @@ -41,20 +42,25 @@ * GPEX host */ +struct GPEXIrq { + qemu_irq irq; + int irq_num; +}; + static void gpex_set_irq(void *opaque, int irq_num, int level) { GPEXHost *s = opaque; - qemu_set_irq(s->irq[irq_num], level); + qemu_set_irq(s->irq[irq_num].irq, level); } int gpex_set_irq_num(GPEXHost *s, int index, int gsi) { - if (index >= GPEX_NUM_IRQS) { + if (index >= s->num_irqs) { return -EINVAL; } - s->irq_num[index] = gsi; + s->irq[index].irq_num = gsi; return 0; } @@ -62,7 +68,7 @@ static PCIINTxRoute gpex_route_intx_pin_to_irq(void *opaque, int pin) { PCIINTxRoute route; GPEXHost *s = opaque; - int gsi = s->irq_num[pin]; + int gsi = s->irq[pin].irq_num; route.irq = gsi; if (gsi < 0) { @@ -74,6 +80,13 @@ static PCIINTxRoute gpex_route_intx_pin_to_irq(void *opaque, int pin) return route; } +static int gpex_swizzle_map_irq_fn(PCIDevice *pci_dev, int pin) +{ + PCIBus *bus = pci_device_root_bus(pci_dev); + + return (PCI_SLOT(pci_dev->devfn) + pin) % bus->nirq; +} + static void gpex_host_realize(DeviceState *dev, Error **errp) { PCIHostState *pci = PCI_HOST_BRIDGE(dev); @@ -82,6 +95,8 @@ static void gpex_host_realize(DeviceState *dev, Error **errp) PCIExpressHost *pex = PCIE_HOST_BRIDGE(dev); int i; + s->irq = g_malloc0_n(s->num_irqs, sizeof(*s->irq)); + pcie_host_mmcfg_init(pex, PCIE_MMCFG_SIZE_MAX); sysbus_init_mmio(sbd, &pex->mmio); @@ -128,19 +143,27 @@ static void gpex_host_realize(DeviceState *dev, Error **errp) sysbus_init_mmio(sbd, &s->io_ioport); } - for (i = 0; i < GPEX_NUM_IRQS; i++) { - sysbus_init_irq(sbd, &s->irq[i]); - s->irq_num[i] = -1; + for (i = 0; i < s->num_irqs; i++) { + sysbus_init_irq(sbd, &s->irq[i].irq); + s->irq[i].irq_num = -1; } pci->bus = pci_register_root_bus(dev, "pcie.0", gpex_set_irq, - pci_swizzle_map_irq_fn, s, &s->io_mmio, - &s->io_ioport, 0, 4, TYPE_PCIE_BUS); + gpex_swizzle_map_irq_fn, + s, &s->io_mmio, &s->io_ioport, 0, + s->num_irqs, TYPE_PCIE_BUS); pci_bus_set_route_irq_fn(pci->bus, gpex_route_intx_pin_to_irq); qdev_realize(DEVICE(&s->gpex_root), BUS(pci->bus), &error_fatal); } +static void gpex_host_unrealize(DeviceState *dev) +{ + GPEXHost *s = GPEX_HOST(dev); + + g_free(s->irq); +} + static const char *gpex_host_root_bus_path(PCIHostState *host_bridge, PCIBus *rootbus) { @@ -166,6 +189,7 @@ static const Property gpex_host_properties[] = { gpex_cfg.mmio64.base, 0), DEFINE_PROP_SIZE(PCI_HOST_ABOVE_4G_MMIO_SIZE, GPEXHost, gpex_cfg.mmio64.size, 0), + DEFINE_PROP_UINT8("num-irqs", GPEXHost, num_irqs, PCI_NUM_PINS), }; static void gpex_host_class_init(ObjectClass *klass, void *data) @@ -175,6 +199,7 @@ static void gpex_host_class_init(ObjectClass *klass, void *data) hc->root_bus_path = gpex_host_root_bus_path; dc->realize = gpex_host_realize; + dc->unrealize = gpex_host_unrealize; set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); dc->fw_name = "pci"; device_class_set_props(dc, gpex_host_properties); -- cgit 1.4.1