--- /dev/null
+/*
+ * 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-common.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 "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
+ */
+int pcie_cap_init(PCIDevice *dev, uint8_t offset, uint8_t type, uint8_t port)
+{
+ 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);
+ if (pos < 0) {
+ return pos;
+ }
+ dev->exp.exp_cap = pos;
+ exp_cap = dev->config + pos;
+
+ /* 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) |
+ PCI_EXP_FLAGS_VER2);
+
+ /* 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 |
+ PCI_EXP_LNK_MLW_1 |
+ PCI_EXP_LNK_LS_25);
+
+ pci_set_word(exp_cap + PCI_EXP_LNKSTA,
+ PCI_EXP_LNK_MLW_1 | PCI_EXP_LNK_LS_25 |PCI_EXP_LNKSTA_DLLLA);
+
+ 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);
+ return pos;
+}
+
+int pcie_endpoint_cap_init(PCIDevice *dev, uint8_t offset)
+{
+ uint8_t type = PCI_EXP_TYPE_ENDPOINT;
+
+ /*
+ * 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(dev->bus) && pci_bus_is_root(dev->bus)) {
+ type = PCI_EXP_TYPE_RC_END;
+ }
+
+ return pcie_cap_init(dev, offset, type, 0);
+}
+
+void pcie_cap_exit(PCIDevice *dev)
+{
+ pci_del_capability(dev, PCI_CAP_ID_EXP, PCI_EXP_VER2_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);
+}
+
+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)) {
+ return;
+ }
+ hotplug_event_notify(dev);
+}
+
+static void pcie_cap_slot_hotplug_common(PCIDevice *hotplug_dev,
+ DeviceState *dev,
+ uint8_t **exp_cap, Error **errp)
+{
+ *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_hotplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
+ Error **errp)
+{
+ uint8_t *exp_cap;
+ PCIDevice *pci_dev = PCI_DEVICE(dev);
+
+ pcie_cap_slot_hotplug_common(PCI_DEVICE(hotplug_dev), dev, &exp_cap, errp);
+
+ /* 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);
+ return;
+ }
+
+ /* TODO: multifunction hot-plug.
+ * Right now, only a device of function = 0 is allowed to be
+ * hot plugged/unplugged.
+ */
+ assert(PCI_FUNC(pci_dev->devfn) == 0);
+
+ pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
+ PCI_EXP_SLTSTA_PDS);
+ pcie_cap_slot_event(PCI_DEVICE(hotplug_dev),
+ PCI_EXP_HP_EV_PDC | PCI_EXP_HP_EV_ABP);
+}
+
+void pcie_cap_slot_hot_unplug_request_cb(HotplugHandler *hotplug_dev,
+ DeviceState *dev, Error **errp)
+{
+ uint8_t *exp_cap;
+
+ pcie_cap_slot_hotplug_common(PCI_DEVICE(hotplug_dev), dev, &exp_cap, errp);
+
+ pcie_cap_slot_push_attention_button(PCI_DEVICE(hotplug_dev));
+}
+
+/* pci express slot for pci express root/downstream port
+ PCI express capability slot registers */
+void pcie_cap_slot_init(PCIDevice *dev, uint16_t slot)
+{
+ 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,
+ (slot << PCI_EXP_SLTCAP_PSN_SHIFT) |
+ PCI_EXP_SLTCAP_EIP |
+ PCI_EXP_SLTCAP_HPS |
+ PCI_EXP_SLTCAP_HPC |
+ PCI_EXP_SLTCAP_PIP |
+ PCI_EXP_SLTCAP_AIP |
+ PCI_EXP_SLTCAP_ABP);
+
+ 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))),
+ DEVICE(dev), NULL);
+}
+
+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);
+}
+
+static void pcie_unplug_device(PCIBus *bus, PCIDevice *dev, void *opaque)
+{
+ object_unparent(OBJECT(dev));
+}
+
+void pcie_cap_slot_write_config(PCIDevice *dev,
+ 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);
+
+ if (ranges_overlap(addr, len, pos + PCI_EXP_SLTSTA, 2)) {
+ 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 polulated, power indicator is off and power
+ * controller is off, it is safe to detach the devices.
+ */
+ if ((sltsta & PCI_EXP_SLTSTA_PDS) && (val & PCI_EXP_SLTCTL_PCC) &&
+ ((val & 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);
+ 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
+ */
+
+static uint16_t pcie_find_capability_list(PCIDevice *dev, uint16_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 shouldn'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)
+{
+ uint32_t header;
+ uint16_t next;
+
+ 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) {
+ header = pci_get_long(dev->config + offset);
+ next = PCI_EXT_CAP_NEXT(header);
+ } else {
+ uint16_t prev;
+
+ /* 0 is reserved cap id. use internally to find the last capability
+ in the linked list */
+ next = pcie_find_capability_list(dev, 0, &prev);
+
+ assert(prev >= PCI_CONFIG_SPACE_SIZE);
+ assert(next == 0);
+ pcie_ext_cap_set_next(dev, prev, offset);
+ }
+ pci_set_long(dev->config + offset, PCI_EXT_CAP(cap_id, cap_ver, next));
+
+ /* 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);
+}
+
+/**************************************************************************
+ * 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);
+}
Code Review / kvmfornfv.git / blobdiff