This series introduces a new device - Generic PCI Express to PCI bridge, and also makes all necessary changes to enable hotplug of the bridge itself and any device into the bridge.
Changes v3->v4: 1. PCIE-PCI Bridge device: "msi_enable"->"msi", "shpc"->"shpc_bar", remove local_err, make "msi" property OnOffAuto, shpc_present() is still here to avoid SHPC_VMSTATE refactoring (address Marcel's comments). 2. Change QEMU PCI capability layout (SeaBIOS side has the same changes): - change reservation fields types: bus_res - uint32_t, others - uint64_t - rename 'non_pref' and 'pref' fields - interpret -1 value as 'ignore' 3. Use parent_realize in Generic PCI Express Root Port properly. 4. Fix documentation: fully replace the DMI-PCI bridge references with the new PCIE-PCI bridge, "PCIE"->"PCI Express", small mistakes and typos - address Laszlo's and Marcel's comments. 5. Rename QEMU PCI cap creation fucntion - addresses Marcel's comment.
Changes v2->v3: (0). 'do_not_use' capability field flag is still _not_ in here since we haven't come to consesus on it yet. 1. Merge commits 5 (bus_reserve property creation) and 6 (property usage) together - addresses Michael's comment. 2. Add 'bus_reserve' property and QEMU PCI capability only to Generic PCIE Root Port - addresses Michael's and Marcel's comments. 3. Change 'bus_reserve' property's default value to 0 - addresses Michael's comment. 4. Rename QEMU bridge-specific PCI capability creation function - addresses Michael's comment. 5. Init the whole QEMU PCI capability with zeroes - addresses Michael's and Laszlo's comments. 6. Change QEMU PCI capability layout (SeaBIOS side has the same changes) - add 'type' field to distinguish multiple RedHat-specific capabilities - addresses Michael's comment - do not mimiŃ PCI Config space register layout, but use mutually exclusive differently sized fields for IO and prefetchable memory limits - addresses Laszlo's comment 7. Correct error handling in PCIE-PCI bridge realize function. 8. Replace a '2' constant with PCI_CAP_FLAGS in the capability creation function - addresses Michael's comment. 9. Remove a comment on _OSC which isn't correct anymore - address Marcel's comment. 10. Add documentation for the Generic PCIE-PCI Bridge and QEMU PCI capability - addresses Michael's comment.
Changes v1->v2: 1. Enable SHPC for the bridge. 2. Enable SHPC support for the Q35 machine (ACPI stuff). 3. Introduce PCI capability to help firmware on the system init. This allows the bridge to be hotpluggable. Now it's supported only for pcie-root-port. Now it's supposed to used with SeaBIOS only, look at the SeaBIOS corresponding series "Allow RedHat PCI bridges reserve more buses than necessary during init".
Aleksandr Bezzubikov (5): hw/i386: allow SHPC for Q35 machine hw/pci: introduce pcie-pci-bridge device hw/pci: introduce bridge-only vendor-specific capability to provide some hints to firmware hw/pci: add QEMU-specific PCI capability to the Generic PCI Express Root Port docs: update documentation considering PCIE-PCI bridge
docs/pcie.txt | 49 +++++---- docs/pcie_pci_bridge.txt | 110 +++++++++++++++++++ hw/i386/acpi-build.c | 4 +- hw/pci-bridge/Makefile.objs | 2 +- hw/pci-bridge/gen_pcie_root_port.c | 33 ++++++ hw/pci-bridge/pcie_pci_bridge.c | 212 +++++++++++++++++++++++++++++++++++++ hw/pci/pci_bridge.c | 29 +++++ include/hw/pci/pci.h | 1 + include/hw/pci/pci_bridge.h | 21 ++++ include/hw/pci/pcie_port.h | 1 + 10 files changed, 436 insertions(+), 26 deletions(-) create mode 100644 docs/pcie_pci_bridge.txt create mode 100644 hw/pci-bridge/pcie_pci_bridge.c
Unmask previously masked SHPC feature in _OSC method.
Signed-off-by: Aleksandr Bezzubikov zuban32s@gmail.com Reviewed-by: Marcel Apfelbaum marcel@redhat.com --- hw/i386/acpi-build.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c index b9c245c..98dd424 100644 --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -1862,9 +1862,9 @@ static Aml *build_q35_osc_method(void)
/* * Always allow native PME, AER (no dependencies) - * Never allow SHPC (no SHPC controller in this system) + * Allow SHPC (PCI bridges can have SHPC controller) */ - aml_append(if_ctx, aml_and(a_ctrl, aml_int(0x1D), a_ctrl)); + aml_append(if_ctx, aml_and(a_ctrl, aml_int(0x1F), a_ctrl));
if_ctx2 = aml_if(aml_lnot(aml_equal(aml_arg(1), aml_int(1)))); /* Unknown revision */
Introduce a new PCIExpress-to-PCI Bridge device, which is a hot-pluggable PCI Express device and supports devices hot-plug with SHPC.
This device is intended to replace the DMI-to-PCI Bridge in an overwhelming majority of use-cases.
Signed-off-by: Aleksandr Bezzubikov zuban32s@gmail.com --- hw/pci-bridge/Makefile.objs | 2 +- hw/pci-bridge/pcie_pci_bridge.c | 212 ++++++++++++++++++++++++++++++++++++++++ include/hw/pci/pci.h | 1 + 3 files changed, 214 insertions(+), 1 deletion(-) create mode 100644 hw/pci-bridge/pcie_pci_bridge.c
diff --git a/hw/pci-bridge/Makefile.objs b/hw/pci-bridge/Makefile.objs index c4683cf..666db37 100644 --- a/hw/pci-bridge/Makefile.objs +++ b/hw/pci-bridge/Makefile.objs @@ -1,4 +1,4 @@ -common-obj-y += pci_bridge_dev.o +common-obj-y += pci_bridge_dev.o pcie_pci_bridge.o common-obj-$(CONFIG_PCIE_PORT) += pcie_root_port.o gen_pcie_root_port.o common-obj-$(CONFIG_PXB) += pci_expander_bridge.o common-obj-$(CONFIG_XIO3130) += xio3130_upstream.o xio3130_downstream.o diff --git a/hw/pci-bridge/pcie_pci_bridge.c b/hw/pci-bridge/pcie_pci_bridge.c new file mode 100644 index 0000000..4127725 --- /dev/null +++ b/hw/pci-bridge/pcie_pci_bridge.c @@ -0,0 +1,212 @@ +/* + * QEMU Generic PCIE-PCI Bridge + * + * Copyright (c) 2017 Aleksandr Bezzubikov + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "qemu/osdep.h" +#include "qapi/error.h" +#include "hw/pci/pci.h" +#include "hw/pci/pci_bus.h" +#include "hw/pci/pci_bridge.h" +#include "hw/pci/msi.h" +#include "hw/pci/shpc.h" +#include "hw/pci/slotid_cap.h" + +typedef struct PCIEPCIBridge { + /*< private >*/ + PCIBridge parent_obj; + + OnOffAuto msi; + MemoryRegion shpc_bar; + /*< public >*/ +} PCIEPCIBridge; + +#define TYPE_PCIE_PCI_BRIDGE_DEV "pcie-pci-bridge" +#define PCIE_PCI_BRIDGE_DEV(obj) \ + OBJECT_CHECK(PCIEPCIBridge, (obj), TYPE_PCIE_PCI_BRIDGE_DEV) + +static void pcie_pci_bridge_realize(PCIDevice *d, Error **errp) +{ + PCIBridge *br = PCI_BRIDGE(d); + PCIEPCIBridge *pcie_br = PCIE_PCI_BRIDGE_DEV(d); + int rc, pos; + + pci_bridge_initfn(d, TYPE_PCI_BUS); + + d->config[PCI_INTERRUPT_PIN] = 0x1; + memory_region_init(&pcie_br->shpc_bar, OBJECT(d), "shpc-bar", + shpc_bar_size(d)); + rc = shpc_init(d, &br->sec_bus, &pcie_br->shpc_bar, 0, errp); + if (rc) { + goto error; + } + + rc = pcie_cap_init(d, 0, PCI_EXP_TYPE_PCI_BRIDGE, 0, errp); + if (rc < 0) { + goto cap_error; + } + + pos = pci_add_capability(d, PCI_CAP_ID_PM, 0, PCI_PM_SIZEOF, errp); + if (pos < 0) { + goto pm_error; + } + d->exp.pm_cap = pos; + pci_set_word(d->config + pos + PCI_PM_PMC, 0x3); + + pcie_cap_arifwd_init(d); + pcie_cap_deverr_init(d); + + rc = pcie_aer_init(d, PCI_ERR_VER, 0x100, PCI_ERR_SIZEOF, errp); + if (rc < 0) { + goto aer_error; + } + + if (pcie_br->msi != ON_OFF_AUTO_OFF) { + rc = msi_init(d, 0, 1, true, true, errp); + if (rc < 0) { + goto msi_error; + } + } + pci_register_bar(d, 0, PCI_BASE_ADDRESS_SPACE_MEMORY | + PCI_BASE_ADDRESS_MEM_TYPE_64, &pcie_br->shpc_bar); + return; + +msi_error: + pcie_aer_exit(d); +aer_error: +pm_error: + pcie_cap_exit(d); +cap_error: + shpc_free(d); +error: + pci_bridge_exitfn(d); +} + +static void pcie_pci_bridge_exit(PCIDevice *d) +{ + PCIEPCIBridge *bridge_dev = PCIE_PCI_BRIDGE_DEV(d); + pcie_cap_exit(d); + shpc_cleanup(d, &bridge_dev->shpc_bar); + pci_bridge_exitfn(d); +} + +static void pcie_pci_bridge_reset(DeviceState *qdev) +{ + PCIDevice *d = PCI_DEVICE(qdev); + pci_bridge_reset(qdev); + msi_reset(d); + shpc_reset(d); +} + +static void pcie_pci_bridge_write_config(PCIDevice *d, + uint32_t address, uint32_t val, int len) +{ + pci_bridge_write_config(d, address, val, len); + msi_write_config(d, address, val, len); + shpc_cap_write_config(d, address, val, len); +} + +static Property pcie_pci_bridge_dev_properties[] = { + DEFINE_PROP_ON_OFF_AUTO("msi", PCIEPCIBridge, msi, ON_OFF_AUTO_ON), + DEFINE_PROP_END_OF_LIST(), +}; + +static bool pcie_pci_bridge_shpc_present(void *opaque, int version_id) +{ + return true; +} + +static const VMStateDescription pcie_pci_bridge_dev_vmstate = { + .name = TYPE_PCIE_PCI_BRIDGE_DEV, + .fields = (VMStateField[]) { + VMSTATE_PCI_DEVICE(parent_obj, PCIBridge), + SHPC_VMSTATE(shpc, PCIDevice, pcie_pci_bridge_shpc_present), + VMSTATE_END_OF_LIST() + } +}; + +static void pcie_pci_bridge_hotplug_cb(HotplugHandler *hotplug_dev, + DeviceState *dev, Error **errp) +{ + PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev); + + if (!shpc_present(pci_hotplug_dev)) { + error_setg(errp, "standard hotplug controller has been disabled for " + "this %s", TYPE_PCIE_PCI_BRIDGE_DEV); + return; + } + shpc_device_hotplug_cb(hotplug_dev, dev, errp); +} + +static void pcie_pci_bridge_hot_unplug_request_cb(HotplugHandler *hotplug_dev, + DeviceState *dev, + Error **errp) +{ + PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev); + + if (!shpc_present(pci_hotplug_dev)) { + error_setg(errp, "standard hotplug controller has been disabled for " + "this %s", TYPE_PCIE_PCI_BRIDGE_DEV); + return; + } + shpc_device_hot_unplug_request_cb(hotplug_dev, dev, errp); +} + +static void pcie_pci_bridge_class_init(ObjectClass *klass, void *data) +{ + PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); + DeviceClass *dc = DEVICE_CLASS(klass); + HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); + + k->is_express = 1; + k->is_bridge = 1; + k->vendor_id = PCI_VENDOR_ID_REDHAT; + k->device_id = PCI_DEVICE_ID_REDHAT_PCIE_BRIDGE; + k->realize = pcie_pci_bridge_realize; + k->exit = pcie_pci_bridge_exit; + k->config_write = pcie_pci_bridge_write_config; + dc->vmsd = &pcie_pci_bridge_dev_vmstate; + dc->props = pcie_pci_bridge_dev_properties; + dc->vmsd = &pcie_pci_bridge_dev_vmstate; + dc->reset = &pcie_pci_bridge_reset; + set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); + hc->plug = pcie_pci_bridge_hotplug_cb; + hc->unplug_request = pcie_pci_bridge_hot_unplug_request_cb; +} + +static const TypeInfo pcie_pci_bridge_info = { + .name = TYPE_PCIE_PCI_BRIDGE_DEV, + .parent = TYPE_PCI_BRIDGE, + .instance_size = sizeof(PCIEPCIBridge), + .class_init = pcie_pci_bridge_class_init, + .interfaces = (InterfaceInfo[]) { + { TYPE_HOTPLUG_HANDLER }, + { }, + } +}; + +static void pciepci_register(void) +{ + type_register_static(&pcie_pci_bridge_info); +} + +type_init(pciepci_register); diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h index e598b09..b33a34f 100644 --- a/include/hw/pci/pci.h +++ b/include/hw/pci/pci.h @@ -98,6 +98,7 @@ #define PCI_DEVICE_ID_REDHAT_PXB_PCIE 0x000b #define PCI_DEVICE_ID_REDHAT_PCIE_RP 0x000c #define PCI_DEVICE_ID_REDHAT_XHCI 0x000d +#define PCI_DEVICE_ID_REDHAT_PCIE_BRIDGE 0x000e #define PCI_DEVICE_ID_REDHAT_QXL 0x0100
#define FMT_PCIBUS PRIx64
On 05/08/2017 23:27, Aleksandr Bezzubikov wrote:
Introduce a new PCIExpress-to-PCI Bridge device, which is a hot-pluggable PCI Express device and supports devices hot-plug with SHPC.
Hi Aleksandr,
This device is intended to replace the DMI-to-PCI Bridge in an overwhelming majority of use-cases.
Please drop the last line ( ... majority...) It simply replaces it.
Signed-off-by: Aleksandr Bezzubikov zuban32s@gmail.com
hw/pci-bridge/Makefile.objs | 2 +- hw/pci-bridge/pcie_pci_bridge.c | 212 ++++++++++++++++++++++++++++++++++++++++ include/hw/pci/pci.h | 1 + 3 files changed, 214 insertions(+), 1 deletion(-) create mode 100644 hw/pci-bridge/pcie_pci_bridge.c
diff --git a/hw/pci-bridge/Makefile.objs b/hw/pci-bridge/Makefile.objs index c4683cf..666db37 100644 --- a/hw/pci-bridge/Makefile.objs +++ b/hw/pci-bridge/Makefile.objs @@ -1,4 +1,4 @@ -common-obj-y += pci_bridge_dev.o +common-obj-y += pci_bridge_dev.o pcie_pci_bridge.o common-obj-$(CONFIG_PCIE_PORT) += pcie_root_port.o gen_pcie_root_port.o common-obj-$(CONFIG_PXB) += pci_expander_bridge.o common-obj-$(CONFIG_XIO3130) += xio3130_upstream.o xio3130_downstream.o diff --git a/hw/pci-bridge/pcie_pci_bridge.c b/hw/pci-bridge/pcie_pci_bridge.c new file mode 100644 index 0000000..4127725 --- /dev/null +++ b/hw/pci-bridge/pcie_pci_bridge.c @@ -0,0 +1,212 @@ +/*
- QEMU Generic PCIE-PCI Bridge
- Copyright (c) 2017 Aleksandr Bezzubikov
Please replace the below license with:
" This work is licensed under the terms of the GNU GPL, version 2 or later. See the COPYING file in the top-level directory."
to be sure it matches QEMU's license.
- Permission is hereby granted, free of charge, to any person obtaining a copy
- of this software and associated documentation files (the "Software"), to deal
- in the Software without restriction, including without limitation the rights
- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- copies of the Software, and to permit persons to whom the Software is
- furnished to do so, subject to the following conditions:
- The above copyright notice and this permission notice shall be included in
- all copies or substantial portions of the Software.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- THE SOFTWARE.
- */
+#include "qemu/osdep.h" +#include "qapi/error.h" +#include "hw/pci/pci.h" +#include "hw/pci/pci_bus.h" +#include "hw/pci/pci_bridge.h" +#include "hw/pci/msi.h" +#include "hw/pci/shpc.h" +#include "hw/pci/slotid_cap.h"
+typedef struct PCIEPCIBridge {
- /*< private >*/
- PCIBridge parent_obj;
- OnOffAuto msi;
- MemoryRegion shpc_bar;
- /*< public >*/
+} PCIEPCIBridge;
+#define TYPE_PCIE_PCI_BRIDGE_DEV "pcie-pci-bridge" +#define PCIE_PCI_BRIDGE_DEV(obj) \
OBJECT_CHECK(PCIEPCIBridge, (obj), TYPE_PCIE_PCI_BRIDGE_DEV)+static void pcie_pci_bridge_realize(PCIDevice *d, Error **errp) +{
- PCIBridge *br = PCI_BRIDGE(d);
- PCIEPCIBridge *pcie_br = PCIE_PCI_BRIDGE_DEV(d);
- int rc, pos;
- pci_bridge_initfn(d, TYPE_PCI_BUS);
- d->config[PCI_INTERRUPT_PIN] = 0x1;
- memory_region_init(&pcie_br->shpc_bar, OBJECT(d), "shpc-bar",
shpc_bar_size(d));- rc = shpc_init(d, &br->sec_bus, &pcie_br->shpc_bar, 0, errp);
- if (rc) {
goto error;- }
- rc = pcie_cap_init(d, 0, PCI_EXP_TYPE_PCI_BRIDGE, 0, errp);
- if (rc < 0) {
goto cap_error;- }
- pos = pci_add_capability(d, PCI_CAP_ID_PM, 0, PCI_PM_SIZEOF, errp);
- if (pos < 0) {
goto pm_error;- }
- d->exp.pm_cap = pos;
- pci_set_word(d->config + pos + PCI_PM_PMC, 0x3);
- pcie_cap_arifwd_init(d);
- pcie_cap_deverr_init(d);
- rc = pcie_aer_init(d, PCI_ERR_VER, 0x100, PCI_ERR_SIZEOF, errp);
- if (rc < 0) {
goto aer_error;- }
- if (pcie_br->msi != ON_OFF_AUTO_OFF) {
rc = msi_init(d, 0, 1, true, true, errp);if (rc < 0) {goto msi_error;}- }
- pci_register_bar(d, 0, PCI_BASE_ADDRESS_SPACE_MEMORY |
PCI_BASE_ADDRESS_MEM_TYPE_64, &pcie_br->shpc_bar);- return;
+msi_error:
- pcie_aer_exit(d);
+aer_error: +pm_error:
- pcie_cap_exit(d);
+cap_error:
- shpc_free(d);
+error:
- pci_bridge_exitfn(d);
+}
+static void pcie_pci_bridge_exit(PCIDevice *d) +{
- PCIEPCIBridge *bridge_dev = PCIE_PCI_BRIDGE_DEV(d);
- pcie_cap_exit(d);
- shpc_cleanup(d, &bridge_dev->shpc_bar);
- pci_bridge_exitfn(d);
+}
+static void pcie_pci_bridge_reset(DeviceState *qdev) +{
- PCIDevice *d = PCI_DEVICE(qdev);
- pci_bridge_reset(qdev);
- msi_reset(d);
- shpc_reset(d);
+}
+static void pcie_pci_bridge_write_config(PCIDevice *d,
uint32_t address, uint32_t val, int len)+{
- pci_bridge_write_config(d, address, val, len);
- msi_write_config(d, address, val, len);
- shpc_cap_write_config(d, address, val, len);
+}
+static Property pcie_pci_bridge_dev_properties[] = {
DEFINE_PROP_ON_OFF_AUTO("msi", PCIEPCIBridge, msi, ON_OFF_AUTO_ON),DEFINE_PROP_END_OF_LIST(),+};
+static bool pcie_pci_bridge_shpc_present(void *opaque, int version_id) +{
- return true;
+}
Already commented on this, you don't need the shpc present check, it is always there (you don't have code to disable it).
Please check previous comments before posting a new version. It makes it hard to follow.
Thanks, Marcel
+static const VMStateDescription pcie_pci_bridge_dev_vmstate = {
.name = TYPE_PCIE_PCI_BRIDGE_DEV,.fields = (VMStateField[]) {VMSTATE_PCI_DEVICE(parent_obj, PCIBridge),SHPC_VMSTATE(shpc, PCIDevice, pcie_pci_bridge_shpc_present),VMSTATE_END_OF_LIST()}+};
+static void pcie_pci_bridge_hotplug_cb(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)+{
- PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev);
- if (!shpc_present(pci_hotplug_dev)) {
error_setg(errp, "standard hotplug controller has been disabled for ""this %s", TYPE_PCIE_PCI_BRIDGE_DEV);return;- }
- shpc_device_hotplug_cb(hotplug_dev, dev, errp);
+}
+static void pcie_pci_bridge_hot_unplug_request_cb(HotplugHandler *hotplug_dev,
DeviceState *dev,Error **errp)+{
- PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev);
- if (!shpc_present(pci_hotplug_dev)) {
error_setg(errp, "standard hotplug controller has been disabled for ""this %s", TYPE_PCIE_PCI_BRIDGE_DEV);return;- }
- shpc_device_hot_unplug_request_cb(hotplug_dev, dev, errp);
+}
+static void pcie_pci_bridge_class_init(ObjectClass *klass, void *data) +{
- PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
- DeviceClass *dc = DEVICE_CLASS(klass);
- HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
- k->is_express = 1;
- k->is_bridge = 1;
- k->vendor_id = PCI_VENDOR_ID_REDHAT;
- k->device_id = PCI_DEVICE_ID_REDHAT_PCIE_BRIDGE;
- k->realize = pcie_pci_bridge_realize;
- k->exit = pcie_pci_bridge_exit;
- k->config_write = pcie_pci_bridge_write_config;
- dc->vmsd = &pcie_pci_bridge_dev_vmstate;
- dc->props = pcie_pci_bridge_dev_properties;
- dc->vmsd = &pcie_pci_bridge_dev_vmstate;
- dc->reset = &pcie_pci_bridge_reset;
- set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
- hc->plug = pcie_pci_bridge_hotplug_cb;
- hc->unplug_request = pcie_pci_bridge_hot_unplug_request_cb;
+}
+static const TypeInfo pcie_pci_bridge_info = {
.name = TYPE_PCIE_PCI_BRIDGE_DEV,.parent = TYPE_PCI_BRIDGE,.instance_size = sizeof(PCIEPCIBridge),.class_init = pcie_pci_bridge_class_init,.interfaces = (InterfaceInfo[]) {{ TYPE_HOTPLUG_HANDLER },{ },}+};
+static void pciepci_register(void) +{
- type_register_static(&pcie_pci_bridge_info);
+}
+type_init(pciepci_register); diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h index e598b09..b33a34f 100644 --- a/include/hw/pci/pci.h +++ b/include/hw/pci/pci.h @@ -98,6 +98,7 @@ #define PCI_DEVICE_ID_REDHAT_PXB_PCIE 0x000b #define PCI_DEVICE_ID_REDHAT_PCIE_RP 0x000c #define PCI_DEVICE_ID_REDHAT_XHCI 0x000d +#define PCI_DEVICE_ID_REDHAT_PCIE_BRIDGE 0x000e #define PCI_DEVICE_ID_REDHAT_QXL 0x0100
#define FMT_PCIBUS PRIx64
2017-08-07 19:39 GMT+03:00 Marcel Apfelbaum marcel@redhat.com:
On 05/08/2017 23:27, Aleksandr Bezzubikov wrote:
Introduce a new PCIExpress-to-PCI Bridge device, which is a hot-pluggable PCI Express device and supports devices hot-plug with SHPC.
Hi Aleksandr,
This device is intended to replace the DMI-to-PCI Bridge in an overwhelming majority of use-cases.
Please drop the last line ( ... majority...) It simply replaces it.
Signed-off-by: Aleksandr Bezzubikov zuban32s@gmail.com
hw/pci-bridge/Makefile.objs | 2 +- hw/pci-bridge/pcie_pci_bridge.c | 212 ++++++++++++++++++++++++++++++++++++++++ include/hw/pci/pci.h | 1 + 3 files changed, 214 insertions(+), 1 deletion(-) create mode 100644 hw/pci-bridge/pcie_pci_bridge.c
diff --git a/hw/pci-bridge/Makefile.objs b/hw/pci-bridge/Makefile.objs index c4683cf..666db37 100644 --- a/hw/pci-bridge/Makefile.objs +++ b/hw/pci-bridge/Makefile.objs @@ -1,4 +1,4 @@ -common-obj-y += pci_bridge_dev.o +common-obj-y += pci_bridge_dev.o pcie_pci_bridge.o common-obj-$(CONFIG_PCIE_PORT) += pcie_root_port.o gen_pcie_root_port.o common-obj-$(CONFIG_PXB) += pci_expander_bridge.o common-obj-$(CONFIG_XIO3130) += xio3130_upstream.o xio3130_downstream.o diff --git a/hw/pci-bridge/pcie_pci_bridge.c b/hw/pci-bridge/pcie_pci_bridge.c new file mode 100644 index 0000000..4127725 --- /dev/null +++ b/hw/pci-bridge/pcie_pci_bridge.c @@ -0,0 +1,212 @@ +/*
- QEMU Generic PCIE-PCI Bridge
- Copyright (c) 2017 Aleksandr Bezzubikov
Please replace the below license with:
" This work is licensed under the terms of the GNU GPL, version 2 or later. See the COPYING file in the top-level directory."
to be sure it matches QEMU's license.
- Permission is hereby granted, free of charge, to any person obtaining
a copy
- of this software and associated documentation files (the "Software"),
to deal
- in the Software without restriction, including without limitation the
rights
- to use, copy, modify, merge, publish, distribute, sublicense, and/or
sell
- copies of the Software, and to permit persons to whom the Software is
- furnished to do so, subject to the following conditions:
- The above copyright notice and this permission notice shall be
included in
- all copies or substantial portions of the Software.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR
- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
SHALL
- THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER
- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM,
- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
IN
- THE SOFTWARE.
- */
+#include "qemu/osdep.h" +#include "qapi/error.h" +#include "hw/pci/pci.h" +#include "hw/pci/pci_bus.h" +#include "hw/pci/pci_bridge.h" +#include "hw/pci/msi.h" +#include "hw/pci/shpc.h" +#include "hw/pci/slotid_cap.h"
+typedef struct PCIEPCIBridge {
- /*< private >*/
- PCIBridge parent_obj;
- OnOffAuto msi;
- MemoryRegion shpc_bar;
- /*< public >*/
+} PCIEPCIBridge;
+#define TYPE_PCIE_PCI_BRIDGE_DEV "pcie-pci-bridge" +#define PCIE_PCI_BRIDGE_DEV(obj) \
OBJECT_CHECK(PCIEPCIBridge, (obj), TYPE_PCIE_PCI_BRIDGE_DEV)+static void pcie_pci_bridge_realize(PCIDevice *d, Error **errp) +{
- PCIBridge *br = PCI_BRIDGE(d);
- PCIEPCIBridge *pcie_br = PCIE_PCI_BRIDGE_DEV(d);
- int rc, pos;
- pci_bridge_initfn(d, TYPE_PCI_BUS);
- d->config[PCI_INTERRUPT_PIN] = 0x1;
- memory_region_init(&pcie_br->shpc_bar, OBJECT(d), "shpc-bar",
shpc_bar_size(d));- rc = shpc_init(d, &br->sec_bus, &pcie_br->shpc_bar, 0, errp);
- if (rc) {
goto error;- }
- rc = pcie_cap_init(d, 0, PCI_EXP_TYPE_PCI_BRIDGE, 0, errp);
- if (rc < 0) {
goto cap_error;- }
- pos = pci_add_capability(d, PCI_CAP_ID_PM, 0, PCI_PM_SIZEOF, errp);
- if (pos < 0) {
goto pm_error;- }
- d->exp.pm_cap = pos;
- pci_set_word(d->config + pos + PCI_PM_PMC, 0x3);
- pcie_cap_arifwd_init(d);
- pcie_cap_deverr_init(d);
- rc = pcie_aer_init(d, PCI_ERR_VER, 0x100, PCI_ERR_SIZEOF, errp);
- if (rc < 0) {
goto aer_error;- }
- if (pcie_br->msi != ON_OFF_AUTO_OFF) {
rc = msi_init(d, 0, 1, true, true, errp);if (rc < 0) {goto msi_error;}- }
- pci_register_bar(d, 0, PCI_BASE_ADDRESS_SPACE_MEMORY |
PCI_BASE_ADDRESS_MEM_TYPE_64, &pcie_br->shpc_bar);- return;
+msi_error:
- pcie_aer_exit(d);
+aer_error: +pm_error:
- pcie_cap_exit(d);
+cap_error:
- shpc_free(d);
+error:
- pci_bridge_exitfn(d);
+}
+static void pcie_pci_bridge_exit(PCIDevice *d) +{
- PCIEPCIBridge *bridge_dev = PCIE_PCI_BRIDGE_DEV(d);
- pcie_cap_exit(d);
- shpc_cleanup(d, &bridge_dev->shpc_bar);
- pci_bridge_exitfn(d);
+}
+static void pcie_pci_bridge_reset(DeviceState *qdev) +{
- PCIDevice *d = PCI_DEVICE(qdev);
- pci_bridge_reset(qdev);
- msi_reset(d);
- shpc_reset(d);
+}
+static void pcie_pci_bridge_write_config(PCIDevice *d,
uint32_t address, uint32_t val, int len)+{
- pci_bridge_write_config(d, address, val, len);
- msi_write_config(d, address, val, len);
- shpc_cap_write_config(d, address, val, len);
+}
+static Property pcie_pci_bridge_dev_properties[] = {
DEFINE_PROP_ON_OFF_AUTO("msi", PCIEPCIBridge, msi,ON_OFF_AUTO_ON),
DEFINE_PROP_END_OF_LIST(),+};
+static bool pcie_pci_bridge_shpc_present(void *opaque, int version_id) +{
- return true;
+}
Already commented on this, you don't need the shpc present check, it is always there (you don't have code to disable it).
Please check previous comments before posting a new version. It makes it hard to follow.
I've seen it, and in the cover letter I've posted the reason why I still have this function - SHPC_VMSTATE takes function as the third arg, so either I refactor SHPC_VMSTATE (and all its usages, and it needs new SHPC_VMSTATE and SHPC_VMSTATE_TEST macros) or I leave it as it is.
Thanks, Marcel
+static const VMStateDescription pcie_pci_bridge_dev_vmstate = {
.name = TYPE_PCIE_PCI_BRIDGE_DEV,.fields = (VMStateField[]) {VMSTATE_PCI_DEVICE(parent_obj, PCIBridge),SHPC_VMSTATE(shpc, PCIDevice, pcie_pci_bridge_shpc_present),VMSTATE_END_OF_LIST()}+};
+static void pcie_pci_bridge_hotplug_cb(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)+{
- PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev);
- if (!shpc_present(pci_hotplug_dev)) {
error_setg(errp, "standard hotplug controller has been disabledfor "
"this %s", TYPE_PCIE_PCI_BRIDGE_DEV);return;- }
- shpc_device_hotplug_cb(hotplug_dev, dev, errp);
+}
+static void pcie_pci_bridge_hot_unplug_request_cb(HotplugHandler *hotplug_dev,
DeviceState *dev,Error **errp)+{
- PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev);
- if (!shpc_present(pci_hotplug_dev)) {
error_setg(errp, "standard hotplug controller has been disabledfor "
"this %s", TYPE_PCIE_PCI_BRIDGE_DEV);return;- }
- shpc_device_hot_unplug_request_cb(hotplug_dev, dev, errp);
+}
+static void pcie_pci_bridge_class_init(ObjectClass *klass, void *data) +{
- PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
- DeviceClass *dc = DEVICE_CLASS(klass);
- HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
- k->is_express = 1;
- k->is_bridge = 1;
- k->vendor_id = PCI_VENDOR_ID_REDHAT;
- k->device_id = PCI_DEVICE_ID_REDHAT_PCIE_BRIDGE;
- k->realize = pcie_pci_bridge_realize;
- k->exit = pcie_pci_bridge_exit;
- k->config_write = pcie_pci_bridge_write_config;
- dc->vmsd = &pcie_pci_bridge_dev_vmstate;
- dc->props = pcie_pci_bridge_dev_properties;
- dc->vmsd = &pcie_pci_bridge_dev_vmstate;
- dc->reset = &pcie_pci_bridge_reset;
- set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
- hc->plug = pcie_pci_bridge_hotplug_cb;
- hc->unplug_request = pcie_pci_bridge_hot_unplug_request_cb;
+}
+static const TypeInfo pcie_pci_bridge_info = {
.name = TYPE_PCIE_PCI_BRIDGE_DEV,.parent = TYPE_PCI_BRIDGE,.instance_size = sizeof(PCIEPCIBridge),.class_init = pcie_pci_bridge_class_init,.interfaces = (InterfaceInfo[]) {{ TYPE_HOTPLUG_HANDLER },{ },}+};
+static void pciepci_register(void) +{
- type_register_static(&pcie_pci_bridge_info);
+}
+type_init(pciepci_register); diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h index e598b09..b33a34f 100644 --- a/include/hw/pci/pci.h +++ b/include/hw/pci/pci.h @@ -98,6 +98,7 @@ #define PCI_DEVICE_ID_REDHAT_PXB_PCIE 0x000b #define PCI_DEVICE_ID_REDHAT_PCIE_RP 0x000c #define PCI_DEVICE_ID_REDHAT_XHCI 0x000d +#define PCI_DEVICE_ID_REDHAT_PCIE_BRIDGE 0x000e #define PCI_DEVICE_ID_REDHAT_QXL 0x0100 #define FMT_PCIBUS PRIx64
On PCI init PCI bridges may need some extra info about bus number, IO, memory and prefetchable memory to reserve. QEMU can provide this with a special vendor-specific PCI capability.
Signed-off-by: Aleksandr Bezzubikov zuban32s@gmail.com --- hw/pci/pci_bridge.c | 29 +++++++++++++++++++++++++++++ include/hw/pci/pci_bridge.h | 21 +++++++++++++++++++++ 2 files changed, 50 insertions(+)
diff --git a/hw/pci/pci_bridge.c b/hw/pci/pci_bridge.c index 720119b..889950d 100644 --- a/hw/pci/pci_bridge.c +++ b/hw/pci/pci_bridge.c @@ -408,6 +408,35 @@ void pci_bridge_map_irq(PCIBridge *br, const char* bus_name, br->bus_name = bus_name; }
+ +int pci_bridge_qemu_reserve_cap_init(PCIDevice *dev, int cap_offset, + uint32_t bus_reserve, uint64_t io_reserve, + uint64_t non_pref_mem_reserve, + uint64_t pref_mem_reserve, + Error **errp) +{ + size_t cap_len = sizeof(PCIBridgeQemuCap); + PCIBridgeQemuCap cap = { + .len = cap_len, + .type = REDHAT_PCI_CAP_QEMU_RESERVE, + .bus_res = bus_reserve, + .io = io_reserve, + .mem = non_pref_mem_reserve, + .mem_pref = pref_mem_reserve + }; + + int offset = pci_add_capability(dev, PCI_CAP_ID_VNDR, + cap_offset, cap_len, errp); + if (offset < 0) { + return offset; + } + + memcpy(dev->config + offset + PCI_CAP_FLAGS, + (char *)&cap + PCI_CAP_FLAGS, + cap_len - PCI_CAP_FLAGS); + return 0; +} + static const TypeInfo pci_bridge_type_info = { .name = TYPE_PCI_BRIDGE, .parent = TYPE_PCI_DEVICE, diff --git a/include/hw/pci/pci_bridge.h b/include/hw/pci/pci_bridge.h index ff7cbaa..be565f7 100644 --- a/include/hw/pci/pci_bridge.h +++ b/include/hw/pci/pci_bridge.h @@ -67,4 +67,25 @@ void pci_bridge_map_irq(PCIBridge *br, const char* bus_name, #define PCI_BRIDGE_CTL_DISCARD_STATUS 0x400 /* Discard timer status */ #define PCI_BRIDGE_CTL_DISCARD_SERR 0x800 /* Discard timer SERR# enable */
+typedef struct PCIBridgeQemuCap { + uint8_t id; /* Standard PCI capability header field */ + uint8_t next; /* Standard PCI capability header field */ + uint8_t len; /* Standard PCI vendor-specific capability header field */ + uint8_t type; /* Red Hat vendor-specific capability type. + Types are defined with REDHAT_PCI_CAP_ prefix */ + + uint32_t bus_res; /* Minimum number of buses to reserve */ + uint64_t io; /* IO space to reserve */ + uint64_t mem; /* Non-prefetchable memory to reserve */ + uint64_t mem_pref; /* Prefetchable memory to reserve */ +} PCIBridgeQemuCap; + +#define REDHAT_PCI_CAP_QEMU_RESERVE 1 + +int pci_bridge_qemu_reserve_cap_init(PCIDevice *dev, int cap_offset, + uint32_t bus_reserve, uint64_t io_reserve, + uint64_t non_pref_mem_reserve, + uint64_t pref_mem_reserve, + Error **errp); + #endif /* QEMU_PCI_BRIDGE_H */
On 05/08/2017 23:27, Aleksandr Bezzubikov wrote:
On PCI init PCI bridges may need some extra info about bus number, IO, memory and prefetchable memory to reserve. QEMU can provide this with a special vendor-specific PCI capability.
Hi Aleksandr,
Signed-off-by: Aleksandr Bezzubikov zuban32s@gmail.com
hw/pci/pci_bridge.c | 29 +++++++++++++++++++++++++++++ include/hw/pci/pci_bridge.h | 21 +++++++++++++++++++++ 2 files changed, 50 insertions(+)
diff --git a/hw/pci/pci_bridge.c b/hw/pci/pci_bridge.c index 720119b..889950d 100644 --- a/hw/pci/pci_bridge.c +++ b/hw/pci/pci_bridge.c @@ -408,6 +408,35 @@ void pci_bridge_map_irq(PCIBridge *br, const char* bus_name, br->bus_name = bus_name; }
+int pci_bridge_qemu_reserve_cap_init(PCIDevice *dev, int cap_offset,
uint32_t bus_reserve, uint64_t io_reserve,uint64_t non_pref_mem_reserve,uint64_t pref_mem_reserve,Error **errp)+{
- size_t cap_len = sizeof(PCIBridgeQemuCap);
- PCIBridgeQemuCap cap = {
.len = cap_len,.type = REDHAT_PCI_CAP_QEMU_RESERVE,
I would change the type to: REDHAT_PCI_CAP_RESOURCE_RESERVE
QEMU is less important here (I think) than "resource".
.bus_res = bus_reserve,.io = io_reserve,.mem = non_pref_mem_reserve,.mem_pref = pref_mem_reserve- };
- int offset = pci_add_capability(dev, PCI_CAP_ID_VNDR,
cap_offset, cap_len, errp);- if (offset < 0) {
return offset;- }
- memcpy(dev->config + offset + PCI_CAP_FLAGS,
(char *)&cap + PCI_CAP_FLAGS,cap_len - PCI_CAP_FLAGS);- return 0;
+}
- static const TypeInfo pci_bridge_type_info = { .name = TYPE_PCI_BRIDGE, .parent = TYPE_PCI_DEVICE,
diff --git a/include/hw/pci/pci_bridge.h b/include/hw/pci/pci_bridge.h index ff7cbaa..be565f7 100644 --- a/include/hw/pci/pci_bridge.h +++ b/include/hw/pci/pci_bridge.h @@ -67,4 +67,25 @@ void pci_bridge_map_irq(PCIBridge *br, const char* bus_name, #define PCI_BRIDGE_CTL_DISCARD_STATUS 0x400 /* Discard timer status */ #define PCI_BRIDGE_CTL_DISCARD_SERR 0x800 /* Discard timer SERR# enable */
+typedef struct PCIBridgeQemuCap {
- uint8_t id; /* Standard PCI capability header field */
- uint8_t next; /* Standard PCI capability header field */
- uint8_t len; /* Standard PCI vendor-specific capability header field */
- uint8_t type; /* Red Hat vendor-specific capability type.
Types are defined with REDHAT_PCI_CAP_ prefix */- uint32_t bus_res; /* Minimum number of buses to reserve */
- uint64_t io; /* IO space to reserve */
- uint64_t mem; /* Non-prefetchable memory to reserve */
- uint64_t mem_pref; /* Prefetchable memory to reserve */
+} PCIBridgeQemuCap;
+#define REDHAT_PCI_CAP_QEMU_RESERVE 1
+int pci_bridge_qemu_reserve_cap_init(PCIDevice *dev, int cap_offset,
uint32_t bus_reserve, uint64_t io_reserve,uint64_t non_pref_mem_reserve,uint64_t pref_mem_reserve,Error **errp);- #endif /* QEMU_PCI_BRIDGE_H */
With the name change, the layout looks good to me:
Reviewed-by: Marcel Apfelbaum marcel@redhat.com
Thanks, Marcel
To enable hotplugging of a newly created pcie-pci-bridge, we need to tell firmware (SeaBIOS in this case) to reserve additional buses or IO/MEM/PREF space for pcie-root-port. Additional bus reservation allows us to hotplug pcie-pci-bridge into this root port. The number of buses to reserve is provided to the device via a corresponding property, and to the firmware via new PCI capability. The properties' default value is -1 to keep default behavior unchanged.
Signed-off-by: Aleksandr Bezzubikov zuban32s@gmail.com --- hw/pci-bridge/gen_pcie_root_port.c | 33 +++++++++++++++++++++++++++++++++ include/hw/pci/pcie_port.h | 1 + 2 files changed, 34 insertions(+)
diff --git a/hw/pci-bridge/gen_pcie_root_port.c b/hw/pci-bridge/gen_pcie_root_port.c index cb694d6..ff8d04c 100644 --- a/hw/pci-bridge/gen_pcie_root_port.c +++ b/hw/pci-bridge/gen_pcie_root_port.c @@ -16,6 +16,8 @@ #include "hw/pci/pcie_port.h"
#define TYPE_GEN_PCIE_ROOT_PORT "pcie-root-port" +#define GEN_PCIE_ROOT_PORT(obj) \ + OBJECT_CHECK(GenPCIERootPort, (obj), TYPE_GEN_PCIE_ROOT_PORT)
#define GEN_PCIE_ROOT_PORT_AER_OFFSET 0x100 #define GEN_PCIE_ROOT_PORT_MSIX_NR_VECTOR 1 @@ -26,6 +28,12 @@ typedef struct GenPCIERootPort { /*< public >*/
bool migrate_msix; + + /* additional buses to reserve on firmware init */ + uint32_t bus_reserve; + uint64_t io_reserve; + uint64_t mem_reserve; + uint64_t pref_reserve; } GenPCIERootPort;
static uint8_t gen_rp_aer_vector(const PCIDevice *d) @@ -60,6 +68,23 @@ static bool gen_rp_test_migrate_msix(void *opaque, int version_id) return rp->migrate_msix; }
+static void gen_rp_realize(DeviceState *dev, Error **errp) +{ + PCIDevice *d = PCI_DEVICE(dev); + GenPCIERootPort *grp = GEN_PCIE_ROOT_PORT(d); + PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(d); + + rpc->parent_realize(dev, errp); + + int rc = pci_bridge_qemu_reserve_cap_init(d, 0, grp->bus_reserve, + grp->io_reserve, grp->mem_reserve, grp->pref_reserve, errp); + + if (rc < 0) { + rpc->parent_class.exit(d); + return; + } +} + static const VMStateDescription vmstate_rp_dev = { .name = "pcie-root-port", .version_id = 1, @@ -78,6 +103,10 @@ static const VMStateDescription vmstate_rp_dev = {
static Property gen_rp_props[] = { DEFINE_PROP_BOOL("x-migrate-msix", GenPCIERootPort, migrate_msix, true), + DEFINE_PROP_UINT32("bus-reserve", GenPCIERootPort, bus_reserve, -1), + DEFINE_PROP_UINT64("io-reserve", GenPCIERootPort, io_reserve, -1), + DEFINE_PROP_UINT64("mem-reserve", GenPCIERootPort, mem_reserve, -1), + DEFINE_PROP_UINT64("pref-reserve", GenPCIERootPort, pref_reserve, -1), DEFINE_PROP_END_OF_LIST() };
@@ -92,6 +121,10 @@ static void gen_rp_dev_class_init(ObjectClass *klass, void *data) dc->desc = "PCI Express Root Port"; dc->vmsd = &vmstate_rp_dev; dc->props = gen_rp_props; + + rpc->parent_realize = dc->realize; + dc->realize = gen_rp_realize; + rpc->aer_vector = gen_rp_aer_vector; rpc->interrupts_init = gen_rp_interrupts_init; rpc->interrupts_uninit = gen_rp_interrupts_uninit; diff --git a/include/hw/pci/pcie_port.h b/include/hw/pci/pcie_port.h index 1333266..0736014 100644 --- a/include/hw/pci/pcie_port.h +++ b/include/hw/pci/pcie_port.h @@ -65,6 +65,7 @@ void pcie_chassis_del_slot(PCIESlot *s);
typedef struct PCIERootPortClass { PCIDeviceClass parent_class; + DeviceRealize parent_realize;
uint8_t (*aer_vector)(const PCIDevice *dev); int (*interrupts_init)(PCIDevice *dev, Error **errp);
On 05/08/2017 23:27, Aleksandr Bezzubikov wrote:
To enable hotplugging of a newly created pcie-pci-bridge, we need to tell firmware (SeaBIOS in this case) to reserve additional buses or IO/MEM/PREF space for pcie-root-port. Additional bus reservation allows us to hotplug pcie-pci-bridge into this root port. The number of buses to reserve is provided to the device via a corresponding property, and to the firmware via new PCI capability. The properties' default value is -1 to keep default behavior unchanged.
Signed-off-by: Aleksandr Bezzubikov zuban32s@gmail.com
hw/pci-bridge/gen_pcie_root_port.c | 33 +++++++++++++++++++++++++++++++++ include/hw/pci/pcie_port.h | 1 + 2 files changed, 34 insertions(+)
diff --git a/hw/pci-bridge/gen_pcie_root_port.c b/hw/pci-bridge/gen_pcie_root_port.c index cb694d6..ff8d04c 100644 --- a/hw/pci-bridge/gen_pcie_root_port.c +++ b/hw/pci-bridge/gen_pcie_root_port.c @@ -16,6 +16,8 @@ #include "hw/pci/pcie_port.h"
#define TYPE_GEN_PCIE_ROOT_PORT "pcie-root-port" +#define GEN_PCIE_ROOT_PORT(obj) \
OBJECT_CHECK(GenPCIERootPort, (obj), TYPE_GEN_PCIE_ROOT_PORT)#define GEN_PCIE_ROOT_PORT_AER_OFFSET 0x100 #define GEN_PCIE_ROOT_PORT_MSIX_NR_VECTOR 1
@@ -26,6 +28,12 @@ typedef struct GenPCIERootPort { /*< public >*/
bool migrate_msix;
/* additional buses to reserve on firmware init */
uint32_t bus_reserve;
uint64_t io_reserve;
uint64_t mem_reserve;
uint64_t pref_reserve; } GenPCIERootPort;
static uint8_t gen_rp_aer_vector(const PCIDevice *d)
@@ -60,6 +68,23 @@ static bool gen_rp_test_migrate_msix(void *opaque, int version_id) return rp->migrate_msix; }
+static void gen_rp_realize(DeviceState *dev, Error **errp) +{
- PCIDevice *d = PCI_DEVICE(dev);
- GenPCIERootPort *grp = GEN_PCIE_ROOT_PORT(d);
- PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(d);
- rpc->parent_realize(dev, errp);
- int rc = pci_bridge_qemu_reserve_cap_init(d, 0, grp->bus_reserve,
grp->io_reserve, grp->mem_reserve, grp->pref_reserve, errp);- if (rc < 0) {
rpc->parent_class.exit(d);return;- }
+}
- static const VMStateDescription vmstate_rp_dev = { .name = "pcie-root-port", .version_id = 1,
@@ -78,6 +103,10 @@ static const VMStateDescription vmstate_rp_dev = {
static Property gen_rp_props[] = { DEFINE_PROP_BOOL("x-migrate-msix", GenPCIERootPort, migrate_msix, true),
- DEFINE_PROP_UINT32("bus-reserve", GenPCIERootPort, bus_reserve, -1),
- DEFINE_PROP_UINT64("io-reserve", GenPCIERootPort, io_reserve, -1),
- DEFINE_PROP_UINT64("mem-reserve", GenPCIERootPort, mem_reserve, -1),
- DEFINE_PROP_UINT64("pref-reserve", GenPCIERootPort, pref_reserve, -1), DEFINE_PROP_END_OF_LIST() };
@@ -92,6 +121,10 @@ static void gen_rp_dev_class_init(ObjectClass *klass, void *data) dc->desc = "PCI Express Root Port"; dc->vmsd = &vmstate_rp_dev; dc->props = gen_rp_props;
- rpc->parent_realize = dc->realize;
- dc->realize = gen_rp_realize;
rpc->aer_vector = gen_rp_aer_vector; rpc->interrupts_init = gen_rp_interrupts_init; rpc->interrupts_uninit = gen_rp_interrupts_uninit;diff --git a/include/hw/pci/pcie_port.h b/include/hw/pci/pcie_port.h index 1333266..0736014 100644 --- a/include/hw/pci/pcie_port.h +++ b/include/hw/pci/pcie_port.h @@ -65,6 +65,7 @@ void pcie_chassis_del_slot(PCIESlot *s);
typedef struct PCIERootPortClass { PCIDeviceClass parent_class;
DeviceRealize parent_realize;
uint8_t (*aer_vector)(const PCIDevice *dev); int (*interrupts_init)(PCIDevice *dev, Error **errp);
Reviewed-by: Marcel Apfelbaum marcel@redhat.com
Thanks, Marcel
On Sat, Aug 05, 2017 at 11:27:37PM +0300, Aleksandr Bezzubikov wrote:
To enable hotplugging of a newly created pcie-pci-bridge, we need to tell firmware (SeaBIOS in this case)
Why SeaBIOS is this case?
to reserve additional buses or IO/MEM/PREF space for pcie-root-port. Additional bus reservation allows us to hotplug pcie-pci-bridge into this root port. The number of buses to reserve is provided to the device via a corresponding property, and to the firmware via new PCI capability. The properties' default value is -1 to keep default behavior unchanged.
Signed-off-by: Aleksandr Bezzubikov zuban32s@gmail.com
hw/pci-bridge/gen_pcie_root_port.c | 33 +++++++++++++++++++++++++++++++++ include/hw/pci/pcie_port.h | 1 + 2 files changed, 34 insertions(+)
diff --git a/hw/pci-bridge/gen_pcie_root_port.c b/hw/pci-bridge/gen_pcie_root_port.c index cb694d6..ff8d04c 100644 --- a/hw/pci-bridge/gen_pcie_root_port.c +++ b/hw/pci-bridge/gen_pcie_root_port.c @@ -16,6 +16,8 @@ #include "hw/pci/pcie_port.h"
#define TYPE_GEN_PCIE_ROOT_PORT "pcie-root-port" +#define GEN_PCIE_ROOT_PORT(obj) \
OBJECT_CHECK(GenPCIERootPort, (obj), TYPE_GEN_PCIE_ROOT_PORT)#define GEN_PCIE_ROOT_PORT_AER_OFFSET 0x100 #define GEN_PCIE_ROOT_PORT_MSIX_NR_VECTOR 1 @@ -26,6 +28,12 @@ typedef struct GenPCIERootPort { /*< public >*/
bool migrate_msix;
- /* additional buses to reserve on firmware init */
- uint32_t bus_reserve;
- uint64_t io_reserve;
- uint64_t mem_reserve;
- uint64_t pref_reserve;
} GenPCIERootPort;
static uint8_t gen_rp_aer_vector(const PCIDevice *d) @@ -60,6 +68,23 @@ static bool gen_rp_test_migrate_msix(void *opaque, int version_id) return rp->migrate_msix; }
+static void gen_rp_realize(DeviceState *dev, Error **errp) +{
- PCIDevice *d = PCI_DEVICE(dev);
- GenPCIERootPort *grp = GEN_PCIE_ROOT_PORT(d);
- PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(d);
- rpc->parent_realize(dev, errp);
- int rc = pci_bridge_qemu_reserve_cap_init(d, 0, grp->bus_reserve,
grp->io_reserve, grp->mem_reserve, grp->pref_reserve, errp);
You have to skip adding this capability by default to avoid breaking migration to/from old QEMU. A simple way to do this is to check whether any have been specified as != -1.
- if (rc < 0) {
rpc->parent_class.exit(d);return;- }
+}
static const VMStateDescription vmstate_rp_dev = { .name = "pcie-root-port", .version_id = 1, @@ -78,6 +103,10 @@ static const VMStateDescription vmstate_rp_dev = {
static Property gen_rp_props[] = { DEFINE_PROP_BOOL("x-migrate-msix", GenPCIERootPort, migrate_msix, true),
- DEFINE_PROP_UINT32("bus-reserve", GenPCIERootPort, bus_reserve, -1),
- DEFINE_PROP_UINT64("io-reserve", GenPCIERootPort, io_reserve, -1),
- DEFINE_PROP_UINT64("mem-reserve", GenPCIERootPort, mem_reserve, -1),
- DEFINE_PROP_UINT64("pref-reserve", GenPCIERootPort, pref_reserve, -1), DEFINE_PROP_END_OF_LIST()
};
@@ -92,6 +121,10 @@ static void gen_rp_dev_class_init(ObjectClass *klass, void *data) dc->desc = "PCI Express Root Port"; dc->vmsd = &vmstate_rp_dev; dc->props = gen_rp_props;
- rpc->parent_realize = dc->realize;
- dc->realize = gen_rp_realize;
- rpc->aer_vector = gen_rp_aer_vector; rpc->interrupts_init = gen_rp_interrupts_init; rpc->interrupts_uninit = gen_rp_interrupts_uninit;
diff --git a/include/hw/pci/pcie_port.h b/include/hw/pci/pcie_port.h index 1333266..0736014 100644 --- a/include/hw/pci/pcie_port.h +++ b/include/hw/pci/pcie_port.h @@ -65,6 +65,7 @@ void pcie_chassis_del_slot(PCIESlot *s);
typedef struct PCIERootPortClass { PCIDeviceClass parent_class;
DeviceRealize parent_realize;
uint8_t (*aer_vector)(const PCIDevice *dev); int (*interrupts_init)(PCIDevice *dev, Error **errp);
-- 2.7.4
2017-08-08 22:54 GMT+03:00 Michael S. Tsirkin mst@redhat.com:
On Sat, Aug 05, 2017 at 11:27:37PM +0300, Aleksandr Bezzubikov wrote:
To enable hotplugging of a newly created pcie-pci-bridge, we need to tell firmware (SeaBIOS in this case)
Why SeaBIOS is this case?
It is the default BIOS for QEMU and therefore it is the best place to try out a new feature like this reservation cap.
to reserve additional buses or IO/MEM/PREF space for pcie-root-port. Additional bus reservation allows us to hotplug pcie-pci-bridge into this root port. The number of buses to reserve is provided to the device via a corresponding property, and to the firmware via new PCI capability. The properties' default value is -1 to keep default behavior unchanged.
Signed-off-by: Aleksandr Bezzubikov zuban32s@gmail.com
hw/pci-bridge/gen_pcie_root_port.c | 33 +++++++++++++++++++++++++++++++++ include/hw/pci/pcie_port.h | 1 + 2 files changed, 34 insertions(+)
diff --git a/hw/pci-bridge/gen_pcie_root_port.c b/hw/pci-bridge/gen_pcie_root_port.c index cb694d6..ff8d04c 100644 --- a/hw/pci-bridge/gen_pcie_root_port.c +++ b/hw/pci-bridge/gen_pcie_root_port.c @@ -16,6 +16,8 @@ #include "hw/pci/pcie_port.h"
#define TYPE_GEN_PCIE_ROOT_PORT "pcie-root-port" +#define GEN_PCIE_ROOT_PORT(obj) \
OBJECT_CHECK(GenPCIERootPort, (obj), TYPE_GEN_PCIE_ROOT_PORT)#define GEN_PCIE_ROOT_PORT_AER_OFFSET 0x100 #define GEN_PCIE_ROOT_PORT_MSIX_NR_VECTOR 1 @@ -26,6 +28,12 @@ typedef struct GenPCIERootPort { /*< public >*/
bool migrate_msix;
- /* additional buses to reserve on firmware init */
- uint32_t bus_reserve;
- uint64_t io_reserve;
- uint64_t mem_reserve;
- uint64_t pref_reserve;
} GenPCIERootPort;
static uint8_t gen_rp_aer_vector(const PCIDevice *d) @@ -60,6 +68,23 @@ static bool gen_rp_test_migrate_msix(void *opaque, int version_id) return rp->migrate_msix; }
+static void gen_rp_realize(DeviceState *dev, Error **errp) +{
- PCIDevice *d = PCI_DEVICE(dev);
- GenPCIERootPort *grp = GEN_PCIE_ROOT_PORT(d);
- PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(d);
- rpc->parent_realize(dev, errp);
- int rc = pci_bridge_qemu_reserve_cap_init(d, 0, grp->bus_reserve,
grp->io_reserve, grp->mem_reserve, grp->pref_reserve, errp);You have to skip adding this capability by default to avoid breaking migration to/from old QEMU. A simple way to do this is to check whether any have been specified as != -1.
Agreed, I can't understand how the capability that is brand new and unused by another code except mine can break migration.
- if (rc < 0) {
rpc->parent_class.exit(d);return;- }
+}
static const VMStateDescription vmstate_rp_dev = { .name = "pcie-root-port", .version_id = 1, @@ -78,6 +103,10 @@ static const VMStateDescription vmstate_rp_dev = {
static Property gen_rp_props[] = { DEFINE_PROP_BOOL("x-migrate-msix", GenPCIERootPort, migrate_msix, true),
- DEFINE_PROP_UINT32("bus-reserve", GenPCIERootPort, bus_reserve, -1),
- DEFINE_PROP_UINT64("io-reserve", GenPCIERootPort, io_reserve, -1),
- DEFINE_PROP_UINT64("mem-reserve", GenPCIERootPort, mem_reserve, -1),
- DEFINE_PROP_UINT64("pref-reserve", GenPCIERootPort, pref_reserve, -1), DEFINE_PROP_END_OF_LIST()
};
@@ -92,6 +121,10 @@ static void gen_rp_dev_class_init(ObjectClass *klass, void *data) dc->desc = "PCI Express Root Port"; dc->vmsd = &vmstate_rp_dev; dc->props = gen_rp_props;
- rpc->parent_realize = dc->realize;
- dc->realize = gen_rp_realize;
- rpc->aer_vector = gen_rp_aer_vector; rpc->interrupts_init = gen_rp_interrupts_init; rpc->interrupts_uninit = gen_rp_interrupts_uninit;
diff --git a/include/hw/pci/pcie_port.h b/include/hw/pci/pcie_port.h index 1333266..0736014 100644 --- a/include/hw/pci/pcie_port.h +++ b/include/hw/pci/pcie_port.h @@ -65,6 +65,7 @@ void pcie_chassis_del_slot(PCIESlot *s);
typedef struct PCIERootPortClass { PCIDeviceClass parent_class;
DeviceRealize parent_realize;
uint8_t (*aer_vector)(const PCIDevice *dev); int (*interrupts_init)(PCIDevice *dev, Error **errp);
-- 2.7.4
Signed-off-by: Aleksandr Bezzubikov zuban32s@gmail.com --- docs/pcie.txt | 49 +++++++++++---------- docs/pcie_pci_bridge.txt | 110 +++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 136 insertions(+), 23 deletions(-) create mode 100644 docs/pcie_pci_bridge.txt
diff --git a/docs/pcie.txt b/docs/pcie.txt index 5bada24..76b85ec 100644 --- a/docs/pcie.txt +++ b/docs/pcie.txt @@ -46,7 +46,7 @@ Place only the following kinds of devices directly on the Root Complex: (2) PCI Express Root Ports (ioh3420), for starting exclusively PCI Express hierarchies.
- (3) DMI-PCI Bridges (i82801b11-bridge), for starting legacy PCI + (3) PCI Express to PCI Bridge (pcie-pci-bridge), for starting legacy PCI hierarchies.
(4) Extra Root Complexes (pxb-pcie), if multiple PCI Express Root Buses @@ -55,18 +55,18 @@ Place only the following kinds of devices directly on the Root Complex: pcie.0 bus ---------------------------------------------------------------------------- | | | | - ----------- ------------------ ------------------ -------------- - | PCI Dev | | PCIe Root Port | | DMI-PCI Bridge | | pxb-pcie | - ----------- ------------------ ------------------ -------------- + ----------- ------------------ ------------------- -------------- + | PCI Dev | | PCIe Root Port | | PCIe-PCI Bridge | | pxb-pcie | + ----------- ------------------ ------------------- --------------
2.1.1 To plug a device into pcie.0 as a Root Complex Integrated Endpoint use: -device <dev>[,bus=pcie.0] 2.1.2 To expose a new PCI Express Root Bus use: -device pxb-pcie,id=pcie.1,bus_nr=x[,numa_node=y][,addr=z] - Only PCI Express Root Ports and DMI-PCI bridges can be connected - to the pcie.1 bus: + PCI Express Root Ports and PCI Express to PCI bridges can be + connected to the pcie.1 bus: -device ioh3420,id=root_port1[,bus=pcie.1][,chassis=x][,slot=y][,addr=z] \ - -device i82801b11-bridge,id=dmi_pci_bridge1,bus=pcie.1 + -device pcie-pci-bridge,id=pcie_pci_bridge1,bus=pcie.1
2.2 PCI Express only hierarchy @@ -130,24 +130,24 @@ Notes: Legacy PCI devices can be plugged into pcie.0 as Integrated Endpoints, but, as mentioned in section 5, doing so means the legacy PCI device in question will be incapable of hot-unplugging. -Besides that use DMI-PCI Bridges (i82801b11-bridge) in combination -with PCI-PCI Bridges (pci-bridge) to start PCI hierarchies. +Besides that use PCI Express to PCI Bridges (pcie-pci-bridge) in +combination with PCI-PCI Bridges (pci-bridge) to start PCI hierarchies.
-Prefer flat hierarchies. For most scenarios a single DMI-PCI Bridge +Prefer flat hierarchies. For most scenarios a single PCI Express to PCI Bridge (having 32 slots) and several PCI-PCI Bridges attached to it (each supporting also 32 slots) will support hundreds of legacy devices. -The recommendation is to populate one PCI-PCI Bridge under the DMI-PCI Bridge -until is full and then plug a new PCI-PCI Bridge... +The recommendation is to populate one PCI-PCI Bridge under the +PCI Express to PCI Bridge until is full and then plug a new PCI-PCI Bridge...
pcie.0 bus ---------------------------------------------- | | - ----------- ------------------ - | PCI Dev | | DMI-PCI BRIDGE | - ---------- ------------------ + ----------- ------------------- + | PCI Dev | | PCIe-PCI Bridge | + ----------- ------------------- | | ------------------ ------------------ - | PCI-PCI Bridge | | PCI-PCI Bridge | ... + | PCI-PCI Bridge | | PCI-PCI Bridge | ------------------ ------------------ | | ----------- ----------- @@ -157,11 +157,11 @@ until is full and then plug a new PCI-PCI Bridge... 2.3.1 To plug a PCI device into pcie.0 as an Integrated Endpoint use: -device <dev>[,bus=pcie.0] 2.3.2 Plugging a PCI device into a PCI-PCI Bridge: - -device i82801b11-bridge,id=dmi_pci_bridge1[,bus=pcie.0] \ - -device pci-bridge,id=pci_bridge1,bus=dmi_pci_bridge1[,chassis_nr=x][,addr=y] \ + -device pcie-pci-bridge,id=pcie_pci_bridge1[,bus=pcie.0] \ + -device pci-bridge,id=pci_bridge1,bus=pcie_pci_bridge1[,chassis_nr=x][,addr=y] \ -device <dev>,bus=pci_bridge1[,addr=x] Note that 'addr' cannot be 0 unless shpc=off parameter is passed to - the PCI Bridge. + the PCI Bridge/PCI Express to PCI Bridge.
3. IO space issues =================== @@ -219,14 +219,16 @@ do not support hot-plug, so any devices plugged into Root Complexes cannot be hot-plugged/hot-unplugged: (1) PCI Express Integrated Endpoints (2) PCI Express Root Ports - (3) DMI-PCI Bridges + (3) PCI Express to PCI Bridges (4) pxb-pcie
Be aware that PCI Express Downstream Ports can't be hot-plugged into an existing PCI Express Upstream Port.
-PCI devices can be hot-plugged into PCI-PCI Bridges. The PCI hot-plug is ACPI -based and can work side by side with the PCI Express native hot-plug. +PCI devices can be hot-plugged into PCI Express to PCI and PCI-PCI Bridges. +The PCI hot-plug into PCI-PCI bridge is ACPI based, whereas hot-plug into +PCI Express to PCI bridges is SHPC-based. They both can work side by side with +the PCI Express native hot-plug.
PCI Express devices can be natively hot-plugged/hot-unplugged into/from PCI Express Root Ports (and PCI Express Downstream Ports). @@ -234,10 +236,11 @@ PCI Express Root Ports (and PCI Express Downstream Ports). 5.1 Planning for hot-plug: (1) PCI hierarchy Leave enough PCI-PCI Bridge slots empty or add one - or more empty PCI-PCI Bridges to the DMI-PCI Bridge. + or more empty PCI-PCI Bridges to the PCI Express to PCI Bridge.
For each such PCI-PCI Bridge the Guest Firmware is expected to reserve 4K IO space and 2M MMIO range to be used for all devices behind it. + Appropriate PCI capability is designed, see pcie_pci_bridge.txt.
Because of the hard IO limit of around 10 PCI Bridges (~ 40K space) per system don't use more than 9 PCI-PCI Bridges, leaving 4K for the diff --git a/docs/pcie_pci_bridge.txt b/docs/pcie_pci_bridge.txt new file mode 100644 index 0000000..89d6754 --- /dev/null +++ b/docs/pcie_pci_bridge.txt @@ -0,0 +1,110 @@ +Generic PCI Express to PCI Bridge +================================ + +Description +=========== +PCIE-to-PCI bridge is a new method for legacy PCI +hierarchies creation on Q35 machines. + +Previously Intel DMI-to-PCI bridge was used for this purpose. +But due to its strict limitations - no support of hot-plug, +no cross-platform and cross-architecture support - a new generic +PCIE-to-PCI bridge should now be used for any legacy PCI device usage +with PCI Express machine. + +This generic PCIE-PCI bridge is a cross-platform device, +can be hot-plugged into appropriate root port (requires additional actions, +see 'PCIE-PCI bridge hot-plug' section), +and supports devices hot-plug into the bridge itself +(with some limitations, see below). + +Hot-plug of legacy PCI devices into the bridge +is provided by bridge's built-in Standard hot-plug Controller. +Though it still has some limitations, see below. + +PCIE-PCI bridge hot-plug +======================= +Guest OSes require extra efforts to enable PCIE-PCI bridge hot-plug. +Motivation - now on init any PCI Express root port which doesn't have +any device plugged in, has no free buses reserved to provide any of them +to a hot-plugged devices in future. + +To solve this problem we reserve additional buses on a firmware level. +Currently only SeaBIOS is supported. +The way of bus number to reserve delivery is special +Red Hat vendor-specific PCI capability, added to the root port +that is planned to have PCIE-PCI bridge hot-plugged in. + +Capability layout (defined in include/hw/pci/pci_bridge.h): + + uint8_t id; Standard PCI capability header field + uint8_t next; Standard PCI capability header field + uint8_t len; Standard PCI vendor-specific capability header field + + uint8_t type; Red Hat vendor-specific capability type + List of currently existing types: + QEMU_RESERVE = 1 + + + uint32_t bus_res; Minimum number of buses to reserve + + uint64_t io; IO space to reserve + uint64_t mem Non-prefetchable memory to reserve + uint64_t mem_pref; Prefetchable memory to reserve + +If any reservation field is equal to -1 then this kind of reservation is not +needed and must be ignored by firmware. + +At the moment this capability is used only in QEMU generic PCIe root port +(-device pcie-root-port). Capability construction function takes all reservation +fields values from corresponding device properties. By default all of them are +set to -1 to leave root port's default behavior unchanged. + +Usage +===== +A detailed command line would be: + +[qemu-bin + storage options] \ +-m 2G \ +-device ioh3420,bus=pcie.0,id=rp1 \ +-device ioh3420,bus=pcie.0,id=rp2 \ +-device pcie-root-port,bus=pcie.0,id=rp3,bus-reserve=1 \ +-device pcie-pci-bridge,id=br1,bus=rp1 \ +-device pcie-pci-bridge,id=br2,bus=rp2 \ +-device e1000,bus=br1,addr=8 + +Then in monitor it's OK to execute next commands: +device_add pcie-pci-bridge,id=br3,bus=rp3 +device_add e1000,bus=br2,addr=1 +device_add e1000,bus=br3,addr=1 + +Here you have: + (1) Cold-plugged: + - Root ports: 1 QEMU generic root port with the capability mentioned above, + 2 ioh3420 root ports; + - 2 PCIE-PCI bridges plugged into 2 different root ports; + - e1000 plugged into the first bridge. + (2) Hot-plugged: + - PCIE-PCI bridge, plugged into QEMU generic root port; + - 2 e1000 cards, one plugged into the cold-plugged PCIE-PCI bridge, + another plugged into the hot-plugged bridge. + +Limitations +=========== +The PCIE-PCI bridge can be hot-plugged only into pcie-root-port that +has proper 'bus-reserve' property value to provide secondary bus for the +hot-plugged bridge. + +Windows 7 and older versions don't support hot-plug devices into the PCIE-PCI bridge. +To enable device hot-plug into the bridge on Linux there're 3 ways: +1) Build shpchp module with this patch http://www.spinics.net/lists/linux-pci/msg63052.html +2) Use kernel 4.14+ where the patch mentioned above is already merged. +3) Set 'msi' property to off - this forced the bridge to use legacy INTx, + which allows the bridge to notify the OS about hot-plug event without having + BUSMASTER set. + +Implementation +============== +The PCIE-PCI bridge is based on PCI-PCI bridge, but also accumulates PCI Express +features as a PCI Express device (is_express=1). +
one comment below
On 08/05/17 22:27, Aleksandr Bezzubikov wrote:
+Capability layout (defined in include/hw/pci/pci_bridge.h):
- uint8_t id; Standard PCI capability header field
- uint8_t next; Standard PCI capability header field
- uint8_t len; Standard PCI vendor-specific capability header field
- uint8_t type; Red Hat vendor-specific capability type
List of currently existing types:QEMU_RESERVE = 1- uint32_t bus_res; Minimum number of buses to reserve
- uint64_t io; IO space to reserve
- uint64_t mem Non-prefetchable memory to reserve
- uint64_t mem_pref; Prefetchable memory to reserve
(I apologize if I missed any concrete points from the past messages regarding this structure.)
How is the firmware supposed to know whether the prefetchable MMIO reservation should be made in 32-bit or 64-bit address space? If we reserve prefetchable MMIO outside of the 32-bit address space, then hot-plugging a device without 64-bit MMIO support could fail.
My earlier request, to distinguish "prefetchable_32" from "prefetchable_64" (mutually exclusively), was so that firmware would know whether to restrict the MMIO reservation to 32-bit address space.
This is based on an earlier email from Alex to me:
On 10/03/16 18:01, Alex Williamson wrote:
I don't think there's such a thing as a 64-bit non-prefetchable aperture. In fact, there are not separate 32 and 64 bit prefetchable apertures. The apertures are:
I/O base/limit - (default 16bit, may be 32bit) Memory base/limit - (32bit only, non-prefetchable) Prefetchable Memory base/limit - (default 32bit, may be 64bit)
This is according to Table 3-2 in the PCI-to-PCI bridge spec rev 1.2.
I don't care much about the 16-bit vs. 32-bit IO difference (that's entirely academic and the Platform Spec init doesn't even provide a way for OVMF to express such a difference). However, the optional restriction to 32-bit matters for the prefetchable MMIO aperture.
Other than this, the patch looks good to me, and I'm ready to R-b.
Thanks! Laszlo
2017-08-08 18:11 GMT+03:00 Laszlo Ersek lersek@redhat.com:
one comment below
On 08/05/17 22:27, Aleksandr Bezzubikov wrote:
+Capability layout (defined in include/hw/pci/pci_bridge.h):
- uint8_t id; Standard PCI capability header field
- uint8_t next; Standard PCI capability header field
- uint8_t len; Standard PCI vendor-specific capability header field
- uint8_t type; Red Hat vendor-specific capability type
List of currently existing types:QEMU_RESERVE = 1- uint32_t bus_res; Minimum number of buses to reserve
- uint64_t io; IO space to reserve
- uint64_t mem Non-prefetchable memory to reserve
- uint64_t mem_pref; Prefetchable memory to reserve
(I apologize if I missed any concrete points from the past messages regarding this structure.)
How is the firmware supposed to know whether the prefetchable MMIO reservation should be made in 32-bit or 64-bit address space? If we reserve prefetchable MMIO outside of the 32-bit address space, then hot-plugging a device without 64-bit MMIO support could fail.
My earlier request, to distinguish "prefetchable_32" from "prefetchable_64" (mutually exclusively), was so that firmware would know whether to restrict the MMIO reservation to 32-bit address space.
IIUC now (in SeaBIOS at least) we just assign this PREF registers unconditionally, so the decision about the mode can be made basing on !=0 UPPER_PREF_LIMIT register. My idea was the same - we can just check if the value doesn't fit into 16-bit (PREF_LIMIT reg size, 32-bit MMIO). Do we really need separate fields for that?
This is based on an earlier email from Alex to me:
On 10/03/16 18:01, Alex Williamson wrote:
I don't think there's such a thing as a 64-bit non-prefetchable aperture. In fact, there are not separate 32 and 64 bit prefetchable apertures. The apertures are:
I/O base/limit - (default 16bit, may be 32bit) Memory base/limit - (32bit only, non-prefetchable) Prefetchable Memory base/limit - (default 32bit, may be 64bit)
This is according to Table 3-2 in the PCI-to-PCI bridge spec rev 1.2.
I don't care much about the 16-bit vs. 32-bit IO difference (that's entirely academic and the Platform Spec init doesn't even provide a way for OVMF to express such a difference). However, the optional restriction to 32-bit matters for the prefetchable MMIO aperture.
Other than this, the patch looks good to me, and I'm ready to R-b.
Thanks! Laszlo
-
Aleksandr Bezzubikov -
Alexander Bezzubikov
-
Laszlo Ersek -
Marcel Apfelbaum -
Michael S. Tsirkin