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07578b0ad6
qemu/hw/pci/pcie.c
David Hildenbrand 07578b0ad6 qdev: Let the hotplug_handler_unplug() caller delete the device 
When unplugging a device, at one point the device will be destroyed
via object_unparent(). This will, one the one hand, unrealize the
removed device hierarchy, and on the other hand, destroy/free the
device hierarchy.

When chaining hotplug handlers, we want to overwrite a bus hotplug
handler by the machine hotplug handler, to be able to perform
some part of the plug/unplug and to forward the calls to the bus hotplug
handler.

For now, the bus hotplug handler would trigger an object_unparent(), not
allowing us to perform some unplug action on a device after we forwarded
the call to the bus hotplug handler. The device would be gone at that
point.

machine_unplug_handler(dev)
    /* eventually do unplug stuff */
    bus_unplug_handler(dev)
    /* dev is gone, we can't do more unplug stuff */

So move the object_unparent() to the original caller of the unplug. For
now, keep the unrealize() at the original places of the
object_unparent(). For implicitly chained hotplug handlers (e.g. pc
code calling acpi hotplug handlers), the object_unparent() has to be
done by the outermost caller. So when calling hotplug_handler_unplug()
from inside an unplug handler, nothing is to be done.

hotplug_handler_unplug(dev) -> calls machine_unplug_handler()
    machine_unplug_handler(dev) {
        /* eventually do unplug stuff */
        bus_unplug_handler(dev) -> calls unrealize(dev)
        /* we can do more unplug stuff but device already unrealized */
    }
object_unparent(dev)

In the long run, every unplug action should be factored out of the
unrealize() function into the unplug handler (especially for PCI). Then
we can get rid of the additonal unrealize() calls and object_unparent()
will properly unrealize the device hierarchy after the device has been
unplugged.

hotplug_handler_unplug(dev) -> calls machine_unplug_handler()
    machine_unplug_handler(dev) {
        /* eventually do unplug stuff */
        bus_unplug_handler(dev) -> only unplugs, does not unrealize
        /* we can do more unplug stuff */
    }
object_unparent(dev) -> will unrealize

The original approach was suggested by Igor Mammedov for the PCI
part, but I extended it to all hotplug handlers. I consider this one
step into the right direction.

To summarize:
- object_unparent() on synchronous unplugs is done by common code
-- "Caller of hotplug_handler_unplug"
- object_unparent() on asynchronous unplugs ("unplug requests") has to
  be done manually
-- "Caller of hotplug_handler_unplug"

Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20190228122849.4296-2-david@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2019-03-06 11:51:08 -03:00

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/*
* 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 "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 "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));
if (dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA) {
pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA,
PCI_EXP_LNKSTA_DLLLA);
}
/* 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);
pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA,
PCI_EXP_LNKSTA_DLLLA);
/*
* 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)) {
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)
{
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);
/* 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) {
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) {
pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA,
PCI_EXP_LNKSTA_DLLLA);
}
pcie_cap_slot_event(PCI_DEVICE(hotplug_dev),
PCI_EXP_HP_EV_PDC | PCI_EXP_HP_EV_ABP);
}
}
void pcie_cap_slot_unplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
Error **errp)
{
object_property_set_bool(OBJECT(dev), false, "realized", NULL);
}
static void pcie_unplug_device(PCIBus *bus, PCIDevice *dev, void *opaque)
{
HotplugHandler *hotplug_ctrl = qdev_get_hotplug_handler(DEVICE(dev));
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);
pcie_cap_slot_plug_common(PCI_DEVICE(hotplug_dev), dev, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
/* 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(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))),
OBJECT(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);
}
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);
if (dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA) {
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)
{
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, Page Aligned Request 0 */
pci_set_word(dev->config + offset + PCI_ATS_CAP, 0);
/* 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);
}
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