From patchwork Fri Feb 11 12:07:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jonathan Cameron X-Patchwork-Id: 12743309 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3F135C433EF for ; Fri, 11 Feb 2022 12:14:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239611AbiBKMO6 (ORCPT ); Fri, 11 Feb 2022 07:14:58 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:56510 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344264AbiBKMO6 (ORCPT ); Fri, 11 Feb 2022 07:14:58 -0500 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 81519F57 for ; Fri, 11 Feb 2022 04:14:56 -0800 (PST) Received: from fraeml738-chm.china.huawei.com (unknown [172.18.147.226]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4JwCG83l1Xz67xv7; Fri, 11 Feb 2022 20:14:08 +0800 (CST) Received: from lhreml710-chm.china.huawei.com (10.201.108.61) by fraeml738-chm.china.huawei.com (10.206.15.219) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Fri, 11 Feb 2022 13:14:54 +0100 Received: from SecurePC-101-06.china.huawei.com (10.122.247.231) by lhreml710-chm.china.huawei.com (10.201.108.61) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Fri, 11 Feb 2022 12:14:53 +0000 From: Jonathan Cameron To: , =?utf-8?q?Alex_Benn=C3=A9e?= , Marcel Apfelbaum , "Michael S . Tsirkin" , Igor Mammedov CC: , Ben Widawsky , "Peter Maydell" , , "Shameerali Kolothum Thodi" , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Saransh Gupta1 , Shreyas Shah , Chris Browy , Samarth Saxena , "Dan Williams" Subject: [PATCH v6 14/43] hw/pxb: Allow creation of a CXL PXB (host bridge) Date: Fri, 11 Feb 2022 12:07:18 +0000 Message-ID: <20220211120747.3074-15-Jonathan.Cameron@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220211120747.3074-1-Jonathan.Cameron@huawei.com> References: <20220211120747.3074-1-Jonathan.Cameron@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.122.247.231] X-ClientProxiedBy: lhreml743-chm.china.huawei.com (10.201.108.193) To lhreml710-chm.china.huawei.com (10.201.108.61) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org From: Ben Widawsky This works like adding a typical pxb device, except the name is 'pxb-cxl' instead of 'pxb-pcie'. An example command line would be as follows: -device pxb-cxl,id=cxl.0,bus="pcie.0",bus_nr=1 A CXL PXB is backward compatible with PCIe. What this means in practice is that an operating system that is unaware of CXL should still be able to enumerate this topology as if it were PCIe. One can create multiple CXL PXB host bridges, but a host bridge can only be connected to the main root bus. Host bridges cannot appear elsewhere in the topology. Note that as of this patch, the ACPI tables needed for the host bridge (specifically, an ACPI object in _SB named ACPI0016 and the CEDT) aren't created. So while this patch internally creates it, it cannot be properly used by an operating system or other system software. Also necessary is to add an exception to scripts/device-crash-test similar to that for exiting pxb as both must created on a PCIexpress host bus. Signed-off-by: Ben Widawsky Signed-off-by: Jonathan.Cameron Reviewed-by: Alex Bennée --- hw/pci-bridge/pci_expander_bridge.c | 86 ++++++++++++++++++++++++++++- hw/pci/pci.c | 7 +++ include/hw/pci/pci.h | 6 ++ scripts/device-crash-test | 1 + 4 files changed, 98 insertions(+), 2 deletions(-) diff --git a/hw/pci-bridge/pci_expander_bridge.c b/hw/pci-bridge/pci_expander_bridge.c index a6caa1e7b5..f762eb4a6e 100644 --- a/hw/pci-bridge/pci_expander_bridge.c +++ b/hw/pci-bridge/pci_expander_bridge.c @@ -17,6 +17,7 @@ #include "hw/pci/pci_host.h" #include "hw/qdev-properties.h" #include "hw/pci/pci_bridge.h" +#include "hw/cxl/cxl.h" #include "qemu/range.h" #include "qemu/error-report.h" #include "qemu/module.h" @@ -56,6 +57,16 @@ DECLARE_INSTANCE_CHECKER(PXBDev, PXB_DEV, DECLARE_INSTANCE_CHECKER(PXBDev, PXB_PCIE_DEV, TYPE_PXB_PCIE_DEVICE) +#define TYPE_PXB_CXL_DEVICE "pxb-cxl" +DECLARE_INSTANCE_CHECKER(PXBDev, PXB_CXL_DEV, + TYPE_PXB_CXL_DEVICE) + +typedef struct CXLHost { + PCIHostState parent_obj; + + CXLComponentState cxl_cstate; +} CXLHost; + struct PXBDev { /*< private >*/ PCIDevice parent_obj; @@ -68,6 +79,11 @@ struct PXBDev { static PXBDev *convert_to_pxb(PCIDevice *dev) { + /* A CXL PXB's parent bus is PCIe, so the normal check won't work */ + if (object_dynamic_cast(OBJECT(dev), TYPE_PXB_CXL_DEVICE)) { + return PXB_CXL_DEV(dev); + } + return pci_bus_is_express(pci_get_bus(dev)) ? PXB_PCIE_DEV(dev) : PXB_DEV(dev); } @@ -112,11 +128,20 @@ static const TypeInfo pxb_pcie_bus_info = { .class_init = pxb_bus_class_init, }; +static const TypeInfo pxb_cxl_bus_info = { + .name = TYPE_PXB_CXL_BUS, + .parent = TYPE_CXL_BUS, + .instance_size = sizeof(PXBBus), + .class_init = pxb_bus_class_init, +}; + static const char *pxb_host_root_bus_path(PCIHostState *host_bridge, PCIBus *rootbus) { - PXBBus *bus = pci_bus_is_express(rootbus) ? - PXB_PCIE_BUS(rootbus) : PXB_BUS(rootbus); + PXBBus *bus = pci_bus_is_cxl(rootbus) ? + PXB_CXL_BUS(rootbus) : + pci_bus_is_express(rootbus) ? PXB_PCIE_BUS(rootbus) : + PXB_BUS(rootbus); snprintf(bus->bus_path, 8, "0000:%02x", pxb_bus_num(rootbus)); return bus->bus_path; @@ -218,6 +243,10 @@ static int pxb_map_irq_fn(PCIDevice *pci_dev, int pin) return pin - PCI_SLOT(pxb->devfn); } +static void pxb_dev_reset(DeviceState *dev) +{ +} + static gint pxb_compare(gconstpointer a, gconstpointer b) { const PXBDev *pxb_a = a, *pxb_b = b; @@ -389,13 +418,66 @@ static const TypeInfo pxb_pcie_dev_info = { }, }; +static void pxb_cxl_dev_realize(PCIDevice *dev, Error **errp) +{ + MachineState *ms = MACHINE(qdev_get_machine()); + + /* A CXL PXB's parent bus is still PCIe */ + if (!pci_bus_is_express(pci_get_bus(dev))) { + error_setg(errp, "pxb-cxl devices cannot reside on a PCI bus"); + return; + } + if (!ms->cxl_devices_state->is_enabled) { + error_setg(errp, "Machine does not have cxl=on"); + return; + } + + pxb_dev_realize_common(dev, CXL, errp); + pxb_dev_reset(DEVICE(dev)); +} + +static void pxb_cxl_dev_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); + + k->realize = pxb_cxl_dev_realize; + k->exit = pxb_dev_exitfn; + /* + * XXX: These types of bridges don't actually show up in the hierarchy so + * vendor, device, class, etc. ids are intentionally left out. + */ + + dc->desc = "CXL Host Bridge"; + device_class_set_props(dc, pxb_dev_properties); + set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); + + /* Host bridges aren't hotpluggable. FIXME: spec reference */ + dc->hotpluggable = false; + dc->reset = pxb_dev_reset; +} + +static const TypeInfo pxb_cxl_dev_info = { + .name = TYPE_PXB_CXL_DEVICE, + .parent = TYPE_PCI_DEVICE, + .instance_size = sizeof(PXBDev), + .class_init = pxb_cxl_dev_class_init, + .interfaces = + (InterfaceInfo[]){ + { INTERFACE_CONVENTIONAL_PCI_DEVICE }, + {}, + }, +}; + static void pxb_register_types(void) { type_register_static(&pxb_bus_info); type_register_static(&pxb_pcie_bus_info); + type_register_static(&pxb_cxl_bus_info); type_register_static(&pxb_host_info); type_register_static(&pxb_dev_info); type_register_static(&pxb_pcie_dev_info); + type_register_static(&pxb_cxl_dev_info); } type_init(pxb_register_types) diff --git a/hw/pci/pci.c b/hw/pci/pci.c index 474ea98c1d..cafebf6f59 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -229,6 +229,12 @@ static const TypeInfo pcie_bus_info = { .class_init = pcie_bus_class_init, }; +static const TypeInfo cxl_bus_info = { + .name = TYPE_CXL_BUS, + .parent = TYPE_PCIE_BUS, + .class_init = pcie_bus_class_init, +}; + static PCIBus *pci_find_bus_nr(PCIBus *bus, int bus_num); static void pci_update_mappings(PCIDevice *d); static void pci_irq_handler(void *opaque, int irq_num, int level); @@ -2892,6 +2898,7 @@ static void pci_register_types(void) { type_register_static(&pci_bus_info); type_register_static(&pcie_bus_info); + type_register_static(&cxl_bus_info); type_register_static(&conventional_pci_interface_info); type_register_static(&cxl_interface_info); type_register_static(&pcie_interface_info); diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h index 305df7add6..f4d09ec582 100644 --- a/include/hw/pci/pci.h +++ b/include/hw/pci/pci.h @@ -410,6 +410,7 @@ typedef PCIINTxRoute (*pci_route_irq_fn)(void *opaque, int pin); #define TYPE_PCI_BUS "PCI" OBJECT_DECLARE_TYPE(PCIBus, PCIBusClass, PCI_BUS) #define TYPE_PCIE_BUS "PCIE" +#define TYPE_CXL_BUS "CXL" typedef void (*pci_bus_dev_fn)(PCIBus *b, PCIDevice *d, void *opaque); typedef void (*pci_bus_fn)(PCIBus *b, void *opaque); @@ -769,6 +770,11 @@ static inline void pci_irq_pulse(PCIDevice *pci_dev) pci_irq_deassert(pci_dev); } +static inline int pci_is_cxl(const PCIDevice *d) +{ + return d->cap_present & QEMU_PCIE_CAP_CXL; +} + static inline int pci_is_express(const PCIDevice *d) { return d->cap_present & QEMU_PCI_CAP_EXPRESS; diff --git a/scripts/device-crash-test b/scripts/device-crash-test index 7fbd99158b..52bd3d8f71 100755 --- a/scripts/device-crash-test +++ b/scripts/device-crash-test @@ -93,6 +93,7 @@ ERROR_RULE_LIST = [ {'device':'pci-bridge', 'expected':True}, # Bridge chassis not specified. Each bridge is required to be assigned a unique chassis id > 0. {'device':'pci-bridge-seat', 'expected':True}, # Bridge chassis not specified. Each bridge is required to be assigned a unique chassis id > 0. {'device':'pxb', 'expected':True}, # Bridge chassis not specified. Each bridge is required to be assigned a unique chassis id > 0. + {'device':'pxb-cxl', 'expected':True}, # pxb-cxl devices cannot reside on a PCI bus. {'device':'scsi-block', 'expected':True}, # drive property not set {'device':'scsi-generic', 'expected':True}, # drive property not set {'device':'scsi-hd', 'expected':True}, # drive property not set