| /* |
| * pcie.c |
| * |
| * Copyright (c) 2010 Isaku Yamahata <yamahata at valinux co jp> |
| * VA Linux Systems Japan K.K. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qapi/error.h" |
| #include "hw/pci/pci_bridge.h" |
| #include "hw/pci/pcie.h" |
| #include "hw/pci/msix.h" |
| #include "hw/pci/msi.h" |
| #include "hw/pci/pci_bus.h" |
| #include "hw/pci/pcie_regs.h" |
| #include "hw/pci/pcie_port.h" |
| #include "qemu/range.h" |
| |
| //#define DEBUG_PCIE |
| #ifdef DEBUG_PCIE |
| # define PCIE_DPRINTF(fmt, ...) \ |
| fprintf(stderr, "%s:%d " fmt, __func__, __LINE__, ## __VA_ARGS__) |
| #else |
| # define PCIE_DPRINTF(fmt, ...) do {} while (0) |
| #endif |
| #define PCIE_DEV_PRINTF(dev, fmt, ...) \ |
| PCIE_DPRINTF("%s:%x "fmt, (dev)->name, (dev)->devfn, ## __VA_ARGS__) |
| |
| |
| /*************************************************************************** |
| * pci express capability helper functions |
| */ |
| |
| static void |
| pcie_cap_v1_fill(PCIDevice *dev, uint8_t port, uint8_t type, uint8_t version) |
| { |
| uint8_t *exp_cap = dev->config + dev->exp.exp_cap; |
| uint8_t *cmask = dev->cmask + dev->exp.exp_cap; |
| |
| /* capability register |
| interrupt message number defaults to 0 */ |
| pci_set_word(exp_cap + PCI_EXP_FLAGS, |
| ((type << PCI_EXP_FLAGS_TYPE_SHIFT) & PCI_EXP_FLAGS_TYPE) | |
| version); |
| |
| /* device capability register |
| * table 7-12: |
| * roll based error reporting bit must be set by all |
| * Functions conforming to the ECN, PCI Express Base |
| * Specification, Revision 1.1., or subsequent PCI Express Base |
| * Specification revisions. |
| */ |
| pci_set_long(exp_cap + PCI_EXP_DEVCAP, PCI_EXP_DEVCAP_RBER); |
| |
| pci_set_long(exp_cap + PCI_EXP_LNKCAP, |
| (port << PCI_EXP_LNKCAP_PN_SHIFT) | |
| PCI_EXP_LNKCAP_ASPMS_0S | |
| QEMU_PCI_EXP_LNKCAP_MLW(QEMU_PCI_EXP_LNK_X1) | |
| QEMU_PCI_EXP_LNKCAP_MLS(QEMU_PCI_EXP_LNK_2_5GT)); |
| |
| pci_set_word(exp_cap + PCI_EXP_LNKSTA, |
| QEMU_PCI_EXP_LNKSTA_NLW(QEMU_PCI_EXP_LNK_X1) | |
| QEMU_PCI_EXP_LNKSTA_CLS(QEMU_PCI_EXP_LNK_2_5GT)); |
| |
| /* We changed link status bits over time, and changing them across |
| * migrations is generally fine as hardware changes them too. |
| * Let's not bother checking. |
| */ |
| pci_set_word(cmask + PCI_EXP_LNKSTA, 0); |
| } |
| |
| static void pcie_cap_fill_slot_lnk(PCIDevice *dev) |
| { |
| PCIESlot *s = (PCIESlot *)object_dynamic_cast(OBJECT(dev), TYPE_PCIE_SLOT); |
| uint8_t *exp_cap = dev->config + dev->exp.exp_cap; |
| |
| /* Skip anything that isn't a PCIESlot */ |
| if (!s) { |
| return; |
| } |
| |
| /* Clear and fill LNKCAP from what was configured above */ |
| pci_long_test_and_clear_mask(exp_cap + PCI_EXP_LNKCAP, |
| PCI_EXP_LNKCAP_MLW | PCI_EXP_LNKCAP_SLS); |
| pci_long_test_and_set_mask(exp_cap + PCI_EXP_LNKCAP, |
| QEMU_PCI_EXP_LNKCAP_MLW(s->width) | |
| QEMU_PCI_EXP_LNKCAP_MLS(s->speed)); |
| |
| /* |
| * Link bandwidth notification is required for all root ports and |
| * downstream ports supporting links wider than x1 or multiple link |
| * speeds. |
| */ |
| if (s->width > QEMU_PCI_EXP_LNK_X1 || |
| s->speed > QEMU_PCI_EXP_LNK_2_5GT) { |
| pci_long_test_and_set_mask(exp_cap + PCI_EXP_LNKCAP, |
| PCI_EXP_LNKCAP_LBNC); |
| } |
| |
| if (s->speed > QEMU_PCI_EXP_LNK_2_5GT) { |
| /* |
| * Hot-plug capable downstream ports and downstream ports supporting |
| * link speeds greater than 5GT/s must hardwire PCI_EXP_LNKCAP_DLLLARC |
| * to 1b. PCI_EXP_LNKCAP_DLLLARC implies PCI_EXP_LNKSTA_DLLLA, which |
| * we also hardwire to 1b here. 2.5GT/s hot-plug slots should also |
| * technically implement this, but it's not done here for compatibility. |
| */ |
| pci_long_test_and_set_mask(exp_cap + PCI_EXP_LNKCAP, |
| PCI_EXP_LNKCAP_DLLLARC); |
| /* the PCI_EXP_LNKSTA_DLLLA will be set in the hotplug function */ |
| |
| /* |
| * Target Link Speed defaults to the highest link speed supported by |
| * the component. 2.5GT/s devices are permitted to hardwire to zero. |
| */ |
| pci_word_test_and_clear_mask(exp_cap + PCI_EXP_LNKCTL2, |
| PCI_EXP_LNKCTL2_TLS); |
| pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKCTL2, |
| QEMU_PCI_EXP_LNKCAP_MLS(s->speed) & |
| PCI_EXP_LNKCTL2_TLS); |
| } |
| |
| /* |
| * 2.5 & 5.0GT/s can be fully described by LNKCAP, but 8.0GT/s is |
| * actually a reference to the highest bit supported in this register. |
| * We assume the device supports all link speeds. |
| */ |
| if (s->speed > QEMU_PCI_EXP_LNK_5GT) { |
| pci_long_test_and_clear_mask(exp_cap + PCI_EXP_LNKCAP2, ~0U); |
| pci_long_test_and_set_mask(exp_cap + PCI_EXP_LNKCAP2, |
| PCI_EXP_LNKCAP2_SLS_2_5GB | |
| PCI_EXP_LNKCAP2_SLS_5_0GB | |
| PCI_EXP_LNKCAP2_SLS_8_0GB); |
| if (s->speed > QEMU_PCI_EXP_LNK_8GT) { |
| pci_long_test_and_set_mask(exp_cap + PCI_EXP_LNKCAP2, |
| PCI_EXP_LNKCAP2_SLS_16_0GB); |
| } |
| } |
| } |
| |
| int pcie_cap_init(PCIDevice *dev, uint8_t offset, |
| uint8_t type, uint8_t port, |
| Error **errp) |
| { |
| /* PCIe cap v2 init */ |
| int pos; |
| uint8_t *exp_cap; |
| |
| assert(pci_is_express(dev)); |
| |
| pos = pci_add_capability(dev, PCI_CAP_ID_EXP, offset, |
| PCI_EXP_VER2_SIZEOF, errp); |
| if (pos < 0) { |
| return pos; |
| } |
| dev->exp.exp_cap = pos; |
| exp_cap = dev->config + pos; |
| |
| /* Filling values common with v1 */ |
| pcie_cap_v1_fill(dev, port, type, PCI_EXP_FLAGS_VER2); |
| |
| /* Fill link speed and width options */ |
| pcie_cap_fill_slot_lnk(dev); |
| |
| /* Filling v2 specific values */ |
| pci_set_long(exp_cap + PCI_EXP_DEVCAP2, |
| PCI_EXP_DEVCAP2_EFF | PCI_EXP_DEVCAP2_EETLPP); |
| |
| pci_set_word(dev->wmask + pos + PCI_EXP_DEVCTL2, PCI_EXP_DEVCTL2_EETLPPB); |
| |
| if (dev->cap_present & QEMU_PCIE_EXTCAP_INIT) { |
| /* read-only to behave like a 'NULL' Extended Capability Header */ |
| pci_set_long(dev->wmask + PCI_CONFIG_SPACE_SIZE, 0); |
| } |
| |
| return pos; |
| } |
| |
| int pcie_cap_v1_init(PCIDevice *dev, uint8_t offset, uint8_t type, |
| uint8_t port) |
| { |
| /* PCIe cap v1 init */ |
| int pos; |
| Error *local_err = NULL; |
| |
| assert(pci_is_express(dev)); |
| |
| pos = pci_add_capability(dev, PCI_CAP_ID_EXP, offset, |
| PCI_EXP_VER1_SIZEOF, &local_err); |
| if (pos < 0) { |
| error_report_err(local_err); |
| return pos; |
| } |
| dev->exp.exp_cap = pos; |
| |
| pcie_cap_v1_fill(dev, port, type, PCI_EXP_FLAGS_VER1); |
| |
| return pos; |
| } |
| |
| static int |
| pcie_endpoint_cap_common_init(PCIDevice *dev, uint8_t offset, uint8_t cap_size) |
| { |
| uint8_t type = PCI_EXP_TYPE_ENDPOINT; |
| Error *local_err = NULL; |
| int ret; |
| |
| /* |
| * Windows guests will report Code 10, device cannot start, if |
| * a regular Endpoint type is exposed on a root complex. These |
| * should instead be Root Complex Integrated Endpoints. |
| */ |
| if (pci_bus_is_express(pci_get_bus(dev)) |
| && pci_bus_is_root(pci_get_bus(dev))) { |
| type = PCI_EXP_TYPE_RC_END; |
| } |
| |
| if (cap_size == PCI_EXP_VER1_SIZEOF) { |
| return pcie_cap_v1_init(dev, offset, type, 0); |
| } else { |
| ret = pcie_cap_init(dev, offset, type, 0, &local_err); |
| |
| if (ret < 0) { |
| error_report_err(local_err); |
| } |
| |
| return ret; |
| } |
| } |
| |
| int pcie_endpoint_cap_init(PCIDevice *dev, uint8_t offset) |
| { |
| return pcie_endpoint_cap_common_init(dev, offset, PCI_EXP_VER2_SIZEOF); |
| } |
| |
| int pcie_endpoint_cap_v1_init(PCIDevice *dev, uint8_t offset) |
| { |
| return pcie_endpoint_cap_common_init(dev, offset, PCI_EXP_VER1_SIZEOF); |
| } |
| |
| void pcie_cap_exit(PCIDevice *dev) |
| { |
| pci_del_capability(dev, PCI_CAP_ID_EXP, PCI_EXP_VER2_SIZEOF); |
| } |
| |
| void pcie_cap_v1_exit(PCIDevice *dev) |
| { |
| pci_del_capability(dev, PCI_CAP_ID_EXP, PCI_EXP_VER1_SIZEOF); |
| } |
| |
| uint8_t pcie_cap_get_type(const PCIDevice *dev) |
| { |
| uint32_t pos = dev->exp.exp_cap; |
| assert(pos > 0); |
| return (pci_get_word(dev->config + pos + PCI_EXP_FLAGS) & |
| PCI_EXP_FLAGS_TYPE) >> PCI_EXP_FLAGS_TYPE_SHIFT; |
| } |
| |
| /* MSI/MSI-X */ |
| /* pci express interrupt message number */ |
| /* 7.8.2 PCI Express Capabilities Register: Interrupt Message Number */ |
| void pcie_cap_flags_set_vector(PCIDevice *dev, uint8_t vector) |
| { |
| uint8_t *exp_cap = dev->config + dev->exp.exp_cap; |
| assert(vector < 32); |
| pci_word_test_and_clear_mask(exp_cap + PCI_EXP_FLAGS, PCI_EXP_FLAGS_IRQ); |
| pci_word_test_and_set_mask(exp_cap + PCI_EXP_FLAGS, |
| vector << PCI_EXP_FLAGS_IRQ_SHIFT); |
| } |
| |
| uint8_t pcie_cap_flags_get_vector(PCIDevice *dev) |
| { |
| return (pci_get_word(dev->config + dev->exp.exp_cap + PCI_EXP_FLAGS) & |
| PCI_EXP_FLAGS_IRQ) >> PCI_EXP_FLAGS_IRQ_SHIFT; |
| } |
| |
| void pcie_cap_deverr_init(PCIDevice *dev) |
| { |
| uint32_t pos = dev->exp.exp_cap; |
| pci_long_test_and_set_mask(dev->config + pos + PCI_EXP_DEVCAP, |
| PCI_EXP_DEVCAP_RBER); |
| pci_long_test_and_set_mask(dev->wmask + pos + PCI_EXP_DEVCTL, |
| PCI_EXP_DEVCTL_CERE | PCI_EXP_DEVCTL_NFERE | |
| PCI_EXP_DEVCTL_FERE | PCI_EXP_DEVCTL_URRE); |
| pci_long_test_and_set_mask(dev->w1cmask + pos + PCI_EXP_DEVSTA, |
| PCI_EXP_DEVSTA_CED | PCI_EXP_DEVSTA_NFED | |
| PCI_EXP_DEVSTA_FED | PCI_EXP_DEVSTA_URD); |
| } |
| |
| void pcie_cap_deverr_reset(PCIDevice *dev) |
| { |
| uint8_t *devctl = dev->config + dev->exp.exp_cap + PCI_EXP_DEVCTL; |
| pci_long_test_and_clear_mask(devctl, |
| PCI_EXP_DEVCTL_CERE | PCI_EXP_DEVCTL_NFERE | |
| PCI_EXP_DEVCTL_FERE | PCI_EXP_DEVCTL_URRE); |
| } |
| |
| void pcie_cap_lnkctl_init(PCIDevice *dev) |
| { |
| uint32_t pos = dev->exp.exp_cap; |
| pci_long_test_and_set_mask(dev->wmask + pos + PCI_EXP_LNKCTL, |
| PCI_EXP_LNKCTL_CCC | PCI_EXP_LNKCTL_ES); |
| } |
| |
| void pcie_cap_lnkctl_reset(PCIDevice *dev) |
| { |
| uint8_t *lnkctl = dev->config + dev->exp.exp_cap + PCI_EXP_LNKCTL; |
| pci_long_test_and_clear_mask(lnkctl, |
| PCI_EXP_LNKCTL_CCC | PCI_EXP_LNKCTL_ES); |
| } |
| |
| static void hotplug_event_update_event_status(PCIDevice *dev) |
| { |
| uint32_t pos = dev->exp.exp_cap; |
| uint8_t *exp_cap = dev->config + pos; |
| uint16_t sltctl = pci_get_word(exp_cap + PCI_EXP_SLTCTL); |
| uint16_t sltsta = pci_get_word(exp_cap + PCI_EXP_SLTSTA); |
| |
| dev->exp.hpev_notified = (sltctl & PCI_EXP_SLTCTL_HPIE) && |
| (sltsta & sltctl & PCI_EXP_HP_EV_SUPPORTED); |
| } |
| |
| static void hotplug_event_notify(PCIDevice *dev) |
| { |
| bool prev = dev->exp.hpev_notified; |
| |
| hotplug_event_update_event_status(dev); |
| |
| if (prev == dev->exp.hpev_notified) { |
| return; |
| } |
| |
| /* Note: the logic above does not take into account whether interrupts |
| * are masked. The result is that interrupt will be sent when it is |
| * subsequently unmasked. This appears to be legal: Section 6.7.3.4: |
| * The Port may optionally send an MSI when there are hot-plug events that |
| * occur while interrupt generation is disabled, and interrupt generation is |
| * subsequently enabled. */ |
| if (msix_enabled(dev)) { |
| msix_notify(dev, pcie_cap_flags_get_vector(dev)); |
| } else if (msi_enabled(dev)) { |
| msi_notify(dev, pcie_cap_flags_get_vector(dev)); |
| } else { |
| pci_set_irq(dev, dev->exp.hpev_notified); |
| } |
| } |
| |
| static void hotplug_event_clear(PCIDevice *dev) |
| { |
| hotplug_event_update_event_status(dev); |
| if (!msix_enabled(dev) && !msi_enabled(dev) && !dev->exp.hpev_notified) { |
| pci_irq_deassert(dev); |
| } |
| } |
| |
| /* |
| * A PCI Express Hot-Plug Event has occurred, so update slot status register |
| * and notify OS of the event if necessary. |
| * |
| * 6.7.3 PCI Express Hot-Plug Events |
| * 6.7.3.4 Software Notification of Hot-Plug Events |
| */ |
| static void pcie_cap_slot_event(PCIDevice *dev, PCIExpressHotPlugEvent event) |
| { |
| /* Minor optimization: if nothing changed - no event is needed. */ |
| if (pci_word_test_and_set_mask(dev->config + dev->exp.exp_cap + |
| PCI_EXP_SLTSTA, event) == event) { |
| return; |
| } |
| hotplug_event_notify(dev); |
| } |
| |
| static void pcie_cap_slot_plug_common(PCIDevice *hotplug_dev, DeviceState *dev, |
| Error **errp) |
| { |
| uint8_t *exp_cap = hotplug_dev->config + hotplug_dev->exp.exp_cap; |
| uint16_t sltsta = pci_get_word(exp_cap + PCI_EXP_SLTSTA); |
| |
| PCIE_DEV_PRINTF(PCI_DEVICE(dev), "hotplug state: 0x%x\n", sltsta); |
| if (sltsta & PCI_EXP_SLTSTA_EIS) { |
| /* the slot is electromechanically locked. |
| * This error is propagated up to qdev and then to HMP/QMP. |
| */ |
| error_setg_errno(errp, EBUSY, "slot is electromechanically locked"); |
| } |
| } |
| |
| void pcie_cap_slot_pre_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev, |
| Error **errp) |
| { |
| PCIDevice *hotplug_pdev = PCI_DEVICE(hotplug_dev); |
| uint8_t *exp_cap = hotplug_pdev->config + hotplug_pdev->exp.exp_cap; |
| uint32_t sltcap = pci_get_word(exp_cap + PCI_EXP_SLTCAP); |
| |
| /* Check if hot-plug is disabled on the slot */ |
| if (dev->hotplugged && (sltcap & PCI_EXP_SLTCAP_HPC) == 0) { |
| error_setg(errp, "Hot-plug failed: unsupported by the port device '%s'", |
| DEVICE(hotplug_pdev)->id); |
| return; |
| } |
| |
| pcie_cap_slot_plug_common(PCI_DEVICE(hotplug_dev), dev, errp); |
| } |
| |
| void pcie_cap_slot_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev, |
| Error **errp) |
| { |
| PCIDevice *hotplug_pdev = PCI_DEVICE(hotplug_dev); |
| uint8_t *exp_cap = hotplug_pdev->config + hotplug_pdev->exp.exp_cap; |
| PCIDevice *pci_dev = PCI_DEVICE(dev); |
| uint32_t lnkcap = pci_get_long(exp_cap + PCI_EXP_LNKCAP); |
| |
| /* Don't send event when device is enabled during qemu machine creation: |
| * it is present on boot, no hotplug event is necessary. We do send an |
| * event when the device is disabled later. */ |
| if (!dev->hotplugged) { |
| pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA, |
| PCI_EXP_SLTSTA_PDS); |
| if (pci_dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA || |
| (lnkcap & PCI_EXP_LNKCAP_DLLLARC)) { |
| pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA, |
| PCI_EXP_LNKSTA_DLLLA); |
| } |
| return; |
| } |
| |
| /* To enable multifunction hot-plug, we just ensure the function |
| * 0 added last. When function 0 is added, we set the sltsta and |
| * inform OS via event notification. |
| */ |
| if (pci_get_function_0(pci_dev)) { |
| pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA, |
| PCI_EXP_SLTSTA_PDS); |
| if (pci_dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA || |
| (lnkcap & PCI_EXP_LNKCAP_DLLLARC)) { |
| pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA, |
| PCI_EXP_LNKSTA_DLLLA); |
| } |
| pcie_cap_slot_event(hotplug_pdev, |
| PCI_EXP_HP_EV_PDC | PCI_EXP_HP_EV_ABP); |
| } |
| } |
| |
| void pcie_cap_slot_unplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev, |
| Error **errp) |
| { |
| qdev_unrealize(dev); |
| } |
| |
| static void pcie_unplug_device(PCIBus *bus, PCIDevice *dev, void *opaque) |
| { |
| HotplugHandler *hotplug_ctrl = qdev_get_hotplug_handler(DEVICE(dev)); |
| |
| if (dev->partially_hotplugged) { |
| dev->qdev.pending_deleted_event = false; |
| return; |
| } |
| hotplug_handler_unplug(hotplug_ctrl, DEVICE(dev), &error_abort); |
| object_unparent(OBJECT(dev)); |
| } |
| |
| void pcie_cap_slot_unplug_request_cb(HotplugHandler *hotplug_dev, |
| DeviceState *dev, Error **errp) |
| { |
| Error *local_err = NULL; |
| PCIDevice *pci_dev = PCI_DEVICE(dev); |
| PCIBus *bus = pci_get_bus(pci_dev); |
| PCIDevice *hotplug_pdev = PCI_DEVICE(hotplug_dev); |
| uint8_t *exp_cap = hotplug_pdev->config + hotplug_pdev->exp.exp_cap; |
| uint32_t sltcap = pci_get_word(exp_cap + PCI_EXP_SLTCAP); |
| |
| /* Check if hot-unplug is disabled on the slot */ |
| if ((sltcap & PCI_EXP_SLTCAP_HPC) == 0) { |
| error_setg(errp, "Hot-unplug failed: " |
| "unsupported by the port device '%s'", |
| DEVICE(hotplug_pdev)->id); |
| return; |
| } |
| |
| pcie_cap_slot_plug_common(hotplug_pdev, dev, &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| return; |
| } |
| |
| dev->pending_deleted_event = true; |
| |
| /* In case user cancel the operation of multi-function hot-add, |
| * remove the function that is unexposed to guest individually, |
| * without interaction with guest. |
| */ |
| if (pci_dev->devfn && |
| !bus->devices[0]) { |
| pcie_unplug_device(bus, pci_dev, NULL); |
| |
| return; |
| } |
| |
| pcie_cap_slot_push_attention_button(hotplug_pdev); |
| } |
| |
| /* pci express slot for pci express root/downstream port |
| PCI express capability slot registers */ |
| void pcie_cap_slot_init(PCIDevice *dev, PCIESlot *s) |
| { |
| uint32_t pos = dev->exp.exp_cap; |
| |
| pci_word_test_and_set_mask(dev->config + pos + PCI_EXP_FLAGS, |
| PCI_EXP_FLAGS_SLOT); |
| |
| pci_long_test_and_clear_mask(dev->config + pos + PCI_EXP_SLTCAP, |
| ~PCI_EXP_SLTCAP_PSN); |
| pci_long_test_and_set_mask(dev->config + pos + PCI_EXP_SLTCAP, |
| (s->slot << PCI_EXP_SLTCAP_PSN_SHIFT) | |
| PCI_EXP_SLTCAP_EIP | |
| PCI_EXP_SLTCAP_PIP | |
| PCI_EXP_SLTCAP_AIP | |
| PCI_EXP_SLTCAP_ABP); |
| if (s->hotplug) { |
| pci_long_test_and_set_mask(dev->config + pos + PCI_EXP_SLTCAP, |
| PCI_EXP_SLTCAP_HPS | |
| PCI_EXP_SLTCAP_HPC); |
| } |
| |
| if (dev->cap_present & QEMU_PCIE_SLTCAP_PCP) { |
| pci_long_test_and_set_mask(dev->config + pos + PCI_EXP_SLTCAP, |
| PCI_EXP_SLTCAP_PCP); |
| pci_word_test_and_clear_mask(dev->config + pos + PCI_EXP_SLTCTL, |
| PCI_EXP_SLTCTL_PCC); |
| pci_word_test_and_set_mask(dev->wmask + pos + PCI_EXP_SLTCTL, |
| PCI_EXP_SLTCTL_PCC); |
| } |
| |
| pci_word_test_and_clear_mask(dev->config + pos + PCI_EXP_SLTCTL, |
| PCI_EXP_SLTCTL_PIC | |
| PCI_EXP_SLTCTL_AIC); |
| pci_word_test_and_set_mask(dev->config + pos + PCI_EXP_SLTCTL, |
| PCI_EXP_SLTCTL_PIC_OFF | |
| PCI_EXP_SLTCTL_AIC_OFF); |
| pci_word_test_and_set_mask(dev->wmask + pos + PCI_EXP_SLTCTL, |
| PCI_EXP_SLTCTL_PIC | |
| PCI_EXP_SLTCTL_AIC | |
| PCI_EXP_SLTCTL_HPIE | |
| PCI_EXP_SLTCTL_CCIE | |
| PCI_EXP_SLTCTL_PDCE | |
| PCI_EXP_SLTCTL_ABPE); |
| /* Although reading PCI_EXP_SLTCTL_EIC returns always 0, |
| * make the bit writable here in order to detect 1b is written. |
| * pcie_cap_slot_write_config() test-and-clear the bit, so |
| * this bit always returns 0 to the guest. |
| */ |
| pci_word_test_and_set_mask(dev->wmask + pos + PCI_EXP_SLTCTL, |
| PCI_EXP_SLTCTL_EIC); |
| |
| pci_word_test_and_set_mask(dev->w1cmask + pos + PCI_EXP_SLTSTA, |
| PCI_EXP_HP_EV_SUPPORTED); |
| |
| dev->exp.hpev_notified = false; |
| |
| qbus_set_hotplug_handler(BUS(pci_bridge_get_sec_bus(PCI_BRIDGE(dev))), |
| OBJECT(dev)); |
| } |
| |
| void pcie_cap_slot_reset(PCIDevice *dev) |
| { |
| uint8_t *exp_cap = dev->config + dev->exp.exp_cap; |
| uint8_t port_type = pcie_cap_get_type(dev); |
| |
| assert(port_type == PCI_EXP_TYPE_DOWNSTREAM || |
| port_type == PCI_EXP_TYPE_ROOT_PORT); |
| |
| PCIE_DEV_PRINTF(dev, "reset\n"); |
| |
| pci_word_test_and_clear_mask(exp_cap + PCI_EXP_SLTCTL, |
| PCI_EXP_SLTCTL_EIC | |
| PCI_EXP_SLTCTL_PIC | |
| PCI_EXP_SLTCTL_AIC | |
| PCI_EXP_SLTCTL_HPIE | |
| PCI_EXP_SLTCTL_CCIE | |
| PCI_EXP_SLTCTL_PDCE | |
| PCI_EXP_SLTCTL_ABPE); |
| pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTCTL, |
| PCI_EXP_SLTCTL_AIC_OFF); |
| |
| if (dev->cap_present & QEMU_PCIE_SLTCAP_PCP) { |
| /* Downstream ports enforce device number 0. */ |
| bool populated = pci_bridge_get_sec_bus(PCI_BRIDGE(dev))->devices[0]; |
| uint16_t pic; |
| |
| if (populated) { |
| pci_word_test_and_clear_mask(exp_cap + PCI_EXP_SLTCTL, |
| PCI_EXP_SLTCTL_PCC); |
| } else { |
| pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTCTL, |
| PCI_EXP_SLTCTL_PCC); |
| } |
| |
| pic = populated ? PCI_EXP_SLTCTL_PIC_ON : PCI_EXP_SLTCTL_PIC_OFF; |
| pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTCTL, pic); |
| } |
| |
| pci_word_test_and_clear_mask(exp_cap + PCI_EXP_SLTSTA, |
| PCI_EXP_SLTSTA_EIS |/* on reset, |
| the lock is released */ |
| PCI_EXP_SLTSTA_CC | |
| PCI_EXP_SLTSTA_PDC | |
| PCI_EXP_SLTSTA_ABP); |
| |
| hotplug_event_update_event_status(dev); |
| } |
| |
| void pcie_cap_slot_get(PCIDevice *dev, uint16_t *slt_ctl, uint16_t *slt_sta) |
| { |
| uint32_t pos = dev->exp.exp_cap; |
| uint8_t *exp_cap = dev->config + pos; |
| *slt_ctl = pci_get_word(exp_cap + PCI_EXP_SLTCTL); |
| *slt_sta = pci_get_word(exp_cap + PCI_EXP_SLTSTA); |
| } |
| |
| void pcie_cap_slot_write_config(PCIDevice *dev, |
| uint16_t old_slt_ctl, uint16_t old_slt_sta, |
| uint32_t addr, uint32_t val, int len) |
| { |
| uint32_t pos = dev->exp.exp_cap; |
| uint8_t *exp_cap = dev->config + pos; |
| uint16_t sltsta = pci_get_word(exp_cap + PCI_EXP_SLTSTA); |
| uint32_t lnkcap = pci_get_long(exp_cap + PCI_EXP_LNKCAP); |
| |
| if (ranges_overlap(addr, len, pos + PCI_EXP_SLTSTA, 2)) { |
| /* |
| * Guests tend to clears all bits during init. |
| * If they clear bits that weren't set this is racy and will lose events: |
| * not a big problem for manual button presses, but a problem for us. |
| * As a work-around, detect this and revert status to what it was |
| * before the write. |
| * |
| * Note: in theory this can be detected as a duplicate button press |
| * which cancels the previous press. Does not seem to happen in |
| * practice as guests seem to only have this bug during init. |
| */ |
| #define PCIE_SLOT_EVENTS (PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD | \ |
| PCI_EXP_SLTSTA_MRLSC | PCI_EXP_SLTSTA_PDC | \ |
| PCI_EXP_SLTSTA_CC) |
| |
| if (val & ~old_slt_sta & PCIE_SLOT_EVENTS) { |
| sltsta = (sltsta & ~PCIE_SLOT_EVENTS) | (old_slt_sta & PCIE_SLOT_EVENTS); |
| pci_set_word(exp_cap + PCI_EXP_SLTSTA, sltsta); |
| } |
| hotplug_event_clear(dev); |
| } |
| |
| if (!ranges_overlap(addr, len, pos + PCI_EXP_SLTCTL, 2)) { |
| return; |
| } |
| |
| if (pci_word_test_and_clear_mask(exp_cap + PCI_EXP_SLTCTL, |
| PCI_EXP_SLTCTL_EIC)) { |
| sltsta ^= PCI_EXP_SLTSTA_EIS; /* toggle PCI_EXP_SLTSTA_EIS bit */ |
| pci_set_word(exp_cap + PCI_EXP_SLTSTA, sltsta); |
| PCIE_DEV_PRINTF(dev, "PCI_EXP_SLTCTL_EIC: " |
| "sltsta -> 0x%02"PRIx16"\n", |
| sltsta); |
| } |
| |
| /* |
| * If the slot is populated, power indicator is off and power |
| * controller is off, it is safe to detach the devices. |
| * |
| * Note: don't detach if condition was already true: |
| * this is a work around for guests that overwrite |
| * control of powered off slots before powering them on. |
| */ |
| if ((sltsta & PCI_EXP_SLTSTA_PDS) && (val & PCI_EXP_SLTCTL_PCC) && |
| (val & PCI_EXP_SLTCTL_PIC_OFF) == PCI_EXP_SLTCTL_PIC_OFF && |
| (!(old_slt_ctl & PCI_EXP_SLTCTL_PCC) || |
| (old_slt_ctl & PCI_EXP_SLTCTL_PIC_OFF) != PCI_EXP_SLTCTL_PIC_OFF)) { |
| PCIBus *sec_bus = pci_bridge_get_sec_bus(PCI_BRIDGE(dev)); |
| pci_for_each_device(sec_bus, pci_bus_num(sec_bus), |
| pcie_unplug_device, NULL); |
| |
| pci_word_test_and_clear_mask(exp_cap + PCI_EXP_SLTSTA, |
| PCI_EXP_SLTSTA_PDS); |
| if (dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA || |
| (lnkcap & PCI_EXP_LNKCAP_DLLLARC)) { |
| pci_word_test_and_clear_mask(exp_cap + PCI_EXP_LNKSTA, |
| PCI_EXP_LNKSTA_DLLLA); |
| } |
| pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA, |
| PCI_EXP_SLTSTA_PDC); |
| } |
| |
| hotplug_event_notify(dev); |
| |
| /* |
| * 6.7.3.2 Command Completed Events |
| * |
| * Software issues a command to a hot-plug capable Downstream Port by |
| * issuing a write transaction that targets any portion of the Port’s Slot |
| * Control register. A single write to the Slot Control register is |
| * considered to be a single command, even if the write affects more than |
| * one field in the Slot Control register. In response to this transaction, |
| * the Port must carry out the requested actions and then set the |
| * associated status field for the command completed event. */ |
| |
| /* Real hardware might take a while to complete requested command because |
| * physical movement would be involved like locking the electromechanical |
| * lock. However in our case, command is completed instantaneously above, |
| * so send a command completion event right now. |
| */ |
| pcie_cap_slot_event(dev, PCI_EXP_HP_EV_CCI); |
| } |
| |
| int pcie_cap_slot_post_load(void *opaque, int version_id) |
| { |
| PCIDevice *dev = opaque; |
| hotplug_event_update_event_status(dev); |
| return 0; |
| } |
| |
| void pcie_cap_slot_push_attention_button(PCIDevice *dev) |
| { |
| pcie_cap_slot_event(dev, PCI_EXP_HP_EV_ABP); |
| } |
| |
| /* root control/capabilities/status. PME isn't emulated for now */ |
| void pcie_cap_root_init(PCIDevice *dev) |
| { |
| pci_set_word(dev->wmask + dev->exp.exp_cap + PCI_EXP_RTCTL, |
| PCI_EXP_RTCTL_SECEE | PCI_EXP_RTCTL_SENFEE | |
| PCI_EXP_RTCTL_SEFEE); |
| } |
| |
| void pcie_cap_root_reset(PCIDevice *dev) |
| { |
| pci_set_word(dev->config + dev->exp.exp_cap + PCI_EXP_RTCTL, 0); |
| } |
| |
| /* function level reset(FLR) */ |
| void pcie_cap_flr_init(PCIDevice *dev) |
| { |
| pci_long_test_and_set_mask(dev->config + dev->exp.exp_cap + PCI_EXP_DEVCAP, |
| PCI_EXP_DEVCAP_FLR); |
| |
| /* Although reading BCR_FLR returns always 0, |
| * the bit is made writable here in order to detect the 1b is written |
| * pcie_cap_flr_write_config() test-and-clear the bit, so |
| * this bit always returns 0 to the guest. |
| */ |
| pci_word_test_and_set_mask(dev->wmask + dev->exp.exp_cap + PCI_EXP_DEVCTL, |
| PCI_EXP_DEVCTL_BCR_FLR); |
| } |
| |
| void pcie_cap_flr_write_config(PCIDevice *dev, |
| uint32_t addr, uint32_t val, int len) |
| { |
| uint8_t *devctl = dev->config + dev->exp.exp_cap + PCI_EXP_DEVCTL; |
| if (pci_get_word(devctl) & PCI_EXP_DEVCTL_BCR_FLR) { |
| /* Clear PCI_EXP_DEVCTL_BCR_FLR after invoking the reset handler |
| so the handler can detect FLR by looking at this bit. */ |
| pci_device_reset(dev); |
| pci_word_test_and_clear_mask(devctl, PCI_EXP_DEVCTL_BCR_FLR); |
| } |
| } |
| |
| /* Alternative Routing-ID Interpretation (ARI) |
| * forwarding support for root and downstream ports |
| */ |
| void pcie_cap_arifwd_init(PCIDevice *dev) |
| { |
| uint32_t pos = dev->exp.exp_cap; |
| pci_long_test_and_set_mask(dev->config + pos + PCI_EXP_DEVCAP2, |
| PCI_EXP_DEVCAP2_ARI); |
| pci_long_test_and_set_mask(dev->wmask + pos + PCI_EXP_DEVCTL2, |
| PCI_EXP_DEVCTL2_ARI); |
| } |
| |
| void pcie_cap_arifwd_reset(PCIDevice *dev) |
| { |
| uint8_t *devctl2 = dev->config + dev->exp.exp_cap + PCI_EXP_DEVCTL2; |
| pci_long_test_and_clear_mask(devctl2, PCI_EXP_DEVCTL2_ARI); |
| } |
| |
| bool pcie_cap_is_arifwd_enabled(const PCIDevice *dev) |
| { |
| if (!pci_is_express(dev)) { |
| return false; |
| } |
| if (!dev->exp.exp_cap) { |
| return false; |
| } |
| |
| return pci_get_long(dev->config + dev->exp.exp_cap + PCI_EXP_DEVCTL2) & |
| PCI_EXP_DEVCTL2_ARI; |
| } |
| |
| /************************************************************************** |
| * pci express extended capability list management functions |
| * uint16_t ext_cap_id (16 bit) |
| * uint8_t cap_ver (4 bit) |
| * uint16_t cap_offset (12 bit) |
| * uint16_t ext_cap_size |
| */ |
| |
| /* Passing a cap_id value > 0xffff will return 0 and put end of list in prev */ |
| static uint16_t pcie_find_capability_list(PCIDevice *dev, uint32_t cap_id, |
| uint16_t *prev_p) |
| { |
| uint16_t prev = 0; |
| uint16_t next; |
| uint32_t header = pci_get_long(dev->config + PCI_CONFIG_SPACE_SIZE); |
| |
| if (!header) { |
| /* no extended capability */ |
| next = 0; |
| goto out; |
| } |
| for (next = PCI_CONFIG_SPACE_SIZE; next; |
| prev = next, next = PCI_EXT_CAP_NEXT(header)) { |
| |
| assert(next >= PCI_CONFIG_SPACE_SIZE); |
| assert(next <= PCIE_CONFIG_SPACE_SIZE - 8); |
| |
| header = pci_get_long(dev->config + next); |
| if (PCI_EXT_CAP_ID(header) == cap_id) { |
| break; |
| } |
| } |
| |
| out: |
| if (prev_p) { |
| *prev_p = prev; |
| } |
| return next; |
| } |
| |
| uint16_t pcie_find_capability(PCIDevice *dev, uint16_t cap_id) |
| { |
| return pcie_find_capability_list(dev, cap_id, NULL); |
| } |
| |
| static void pcie_ext_cap_set_next(PCIDevice *dev, uint16_t pos, uint16_t next) |
| { |
| uint32_t header = pci_get_long(dev->config + pos); |
| assert(!(next & (PCI_EXT_CAP_ALIGN - 1))); |
| header = (header & ~PCI_EXT_CAP_NEXT_MASK) | |
| ((next << PCI_EXT_CAP_NEXT_SHIFT) & PCI_EXT_CAP_NEXT_MASK); |
| pci_set_long(dev->config + pos, header); |
| } |
| |
| /* |
| * Caller must supply valid (offset, size) such that the range wouldn't |
| * overlap with other capability or other registers. |
| * This function doesn't check it. |
| */ |
| void pcie_add_capability(PCIDevice *dev, |
| uint16_t cap_id, uint8_t cap_ver, |
| uint16_t offset, uint16_t size) |
| { |
| assert(offset >= PCI_CONFIG_SPACE_SIZE); |
| assert(offset < offset + size); |
| assert(offset + size <= PCIE_CONFIG_SPACE_SIZE); |
| assert(size >= 8); |
| assert(pci_is_express(dev)); |
| |
| if (offset != PCI_CONFIG_SPACE_SIZE) { |
| uint16_t prev; |
| |
| /* |
| * 0xffffffff is not a valid cap id (it's a 16 bit field). use |
| * internally to find the last capability in the linked list. |
| */ |
| pcie_find_capability_list(dev, 0xffffffff, &prev); |
| assert(prev >= PCI_CONFIG_SPACE_SIZE); |
| pcie_ext_cap_set_next(dev, prev, offset); |
| } |
| pci_set_long(dev->config + offset, PCI_EXT_CAP(cap_id, cap_ver, 0)); |
| |
| /* Make capability read-only by default */ |
| memset(dev->wmask + offset, 0, size); |
| memset(dev->w1cmask + offset, 0, size); |
| /* Check capability by default */ |
| memset(dev->cmask + offset, 0xFF, size); |
| } |
| |
| /* |
| * Sync the PCIe Link Status negotiated speed and width of a bridge with the |
| * downstream device. If downstream device is not present, re-write with the |
| * Link Capability fields. If downstream device reports invalid width or |
| * speed, replace with minimum values (LnkSta fields are RsvdZ on VFs but such |
| * values interfere with PCIe native hotplug detecting new devices). Limit |
| * width and speed to bridge capabilities for compatibility. Use config_read |
| * to access the downstream device since it could be an assigned device with |
| * volatile link information. |
| */ |
| void pcie_sync_bridge_lnk(PCIDevice *bridge_dev) |
| { |
| PCIBridge *br = PCI_BRIDGE(bridge_dev); |
| PCIBus *bus = pci_bridge_get_sec_bus(br); |
| PCIDevice *target = bus->devices[0]; |
| uint8_t *exp_cap = bridge_dev->config + bridge_dev->exp.exp_cap; |
| uint16_t lnksta, lnkcap = pci_get_word(exp_cap + PCI_EXP_LNKCAP); |
| |
| if (!target || !target->exp.exp_cap) { |
| lnksta = lnkcap; |
| } else { |
| lnksta = target->config_read(target, |
| target->exp.exp_cap + PCI_EXP_LNKSTA, |
| sizeof(lnksta)); |
| |
| if ((lnksta & PCI_EXP_LNKSTA_NLW) > (lnkcap & PCI_EXP_LNKCAP_MLW)) { |
| lnksta &= ~PCI_EXP_LNKSTA_NLW; |
| lnksta |= lnkcap & PCI_EXP_LNKCAP_MLW; |
| } else if (!(lnksta & PCI_EXP_LNKSTA_NLW)) { |
| lnksta |= QEMU_PCI_EXP_LNKSTA_NLW(QEMU_PCI_EXP_LNK_X1); |
| } |
| |
| if ((lnksta & PCI_EXP_LNKSTA_CLS) > (lnkcap & PCI_EXP_LNKCAP_SLS)) { |
| lnksta &= ~PCI_EXP_LNKSTA_CLS; |
| lnksta |= lnkcap & PCI_EXP_LNKCAP_SLS; |
| } else if (!(lnksta & PCI_EXP_LNKSTA_CLS)) { |
| lnksta |= QEMU_PCI_EXP_LNKSTA_CLS(QEMU_PCI_EXP_LNK_2_5GT); |
| } |
| } |
| |
| pci_word_test_and_clear_mask(exp_cap + PCI_EXP_LNKSTA, |
| PCI_EXP_LNKSTA_CLS | PCI_EXP_LNKSTA_NLW); |
| pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA, lnksta & |
| (PCI_EXP_LNKSTA_CLS | PCI_EXP_LNKSTA_NLW)); |
| } |
| |
| /************************************************************************** |
| * pci express extended capability helper functions |
| */ |
| |
| /* ARI */ |
| void pcie_ari_init(PCIDevice *dev, uint16_t offset, uint16_t nextfn) |
| { |
| pcie_add_capability(dev, PCI_EXT_CAP_ID_ARI, PCI_ARI_VER, |
| offset, PCI_ARI_SIZEOF); |
| pci_set_long(dev->config + offset + PCI_ARI_CAP, (nextfn & 0xff) << 8); |
| } |
| |
| void pcie_dev_ser_num_init(PCIDevice *dev, uint16_t offset, uint64_t ser_num) |
| { |
| static const int pci_dsn_ver = 1; |
| static const int pci_dsn_cap = 4; |
| |
| pcie_add_capability(dev, PCI_EXT_CAP_ID_DSN, pci_dsn_ver, offset, |
| PCI_EXT_CAP_DSN_SIZEOF); |
| pci_set_quad(dev->config + offset + pci_dsn_cap, ser_num); |
| } |
| |
| void pcie_ats_init(PCIDevice *dev, uint16_t offset, bool aligned) |
| { |
| pcie_add_capability(dev, PCI_EXT_CAP_ID_ATS, 0x1, |
| offset, PCI_EXT_CAP_ATS_SIZEOF); |
| |
| dev->exp.ats_cap = offset; |
| |
| /* Invalidate Queue Depth 0 */ |
| if (aligned) { |
| pci_set_word(dev->config + offset + PCI_ATS_CAP, |
| PCI_ATS_CAP_PAGE_ALIGNED); |
| } |
| /* STU 0, Disabled by default */ |
| pci_set_word(dev->config + offset + PCI_ATS_CTRL, 0); |
| |
| pci_set_word(dev->wmask + dev->exp.ats_cap + PCI_ATS_CTRL, 0x800f); |
| } |
| |
| /* ACS (Access Control Services) */ |
| void pcie_acs_init(PCIDevice *dev, uint16_t offset) |
| { |
| bool is_downstream = pci_is_express_downstream_port(dev); |
| uint16_t cap_bits = 0; |
| |
| /* For endpoints, only multifunction devs may have an ACS capability: */ |
| assert(is_downstream || |
| (dev->cap_present & QEMU_PCI_CAP_MULTIFUNCTION) || |
| PCI_FUNC(dev->devfn)); |
| |
| pcie_add_capability(dev, PCI_EXT_CAP_ID_ACS, PCI_ACS_VER, offset, |
| PCI_ACS_SIZEOF); |
| dev->exp.acs_cap = offset; |
| |
| if (is_downstream) { |
| /* |
| * Downstream ports must implement SV, TB, RR, CR, UF, and DT (with |
| * caveats on the latter four that we ignore for simplicity). |
| * Endpoints may also implement a subset of ACS capabilities, |
| * but these are optional if the endpoint does not support |
| * peer-to-peer between functions and thus omitted here. |
| */ |
| cap_bits = PCI_ACS_SV | PCI_ACS_TB | PCI_ACS_RR | |
| PCI_ACS_CR | PCI_ACS_UF | PCI_ACS_DT; |
| } |
| |
| pci_set_word(dev->config + offset + PCI_ACS_CAP, cap_bits); |
| pci_set_word(dev->wmask + offset + PCI_ACS_CTRL, cap_bits); |
| } |
| |
| void pcie_acs_reset(PCIDevice *dev) |
| { |
| if (dev->exp.acs_cap) { |
| pci_set_word(dev->config + dev->exp.acs_cap + PCI_ACS_CTRL, 0); |
| } |
| } |
