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qemu/hw/pcie.c
Michael S. Tsirkin e927d48722 pci: allow hotplug removal of cold-plugged devices 
This patch fixes hot unplug of cold plugged devices
(those present at system start), which got broken by
5beb8ad503 .

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Cam Macdonell <cam@cs.ualberta.ca>
Tested-by: Cam Macdonell <cam@cs.ualberta.ca>
Reported-by: Cam Macdonell <cam@cs.ualberta.ca>.
2010-11-16 14:55:23 +02:00

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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 "sysemu.h"
#include "range.h"
#include "pci_bridge.h"
#include "pcie.h"
#include "msix.h"
#include "msi.h"
#include "pci_internals.h"
#include "pcie_regs.h"
#include "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_set_long(exp_cap + PCI_EXP_DEVCAP2,
PCI_EXP_DEVCAP2_EFF | PCI_EXP_DEVCAP2_EETLPP);
pci_set_word(dev->wmask + pos, PCI_EXP_DEVCTL2_EETLPPB);
return pos;
}
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_URD | 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 (!pci_msi_enabled(dev)) {
qemu_set_irq(dev->irq[dev->exp.hpev_intx], dev->exp.hpev_notified);
} else if (dev->exp.hpev_notified) {
pci_msi_notify(dev, pcie_cap_flags_get_vector(dev));
}
}
/*
* A PCI Express Hot-Plug Event has occured, 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 int pcie_cap_slot_hotplug(DeviceState *qdev,
PCIDevice *pci_dev, PCIHotplugState state)
{
PCIDevice *d = DO_UPCAST(PCIDevice, qdev, qdev);
uint8_t *exp_cap = d->config + d->exp.exp_cap;
uint16_t sltsta = pci_get_word(exp_cap + PCI_EXP_SLTSTA);
/* 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 (state == PCI_COLDPLUG_ENABLED) {
pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
PCI_EXP_SLTSTA_PDS);
return 0;
}
PCIE_DEV_PRINTF(pci_dev, "hotplug state: %d\n", state);
if (sltsta & PCI_EXP_SLTSTA_EIS) {
/* the slot is electromechanically locked.
* This error is propagated up to qdev and then to HMP/QMP.
*/
return -EBUSY;
}
/* 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);
if (state == PCI_HOTPLUG_ENABLED) {
pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
PCI_EXP_SLTSTA_PDS);
pcie_cap_slot_event(d, PCI_EXP_HP_EV_PDC);
} else {
qdev_free(&pci_dev->qdev);
pci_word_test_and_clear_mask(exp_cap + PCI_EXP_SLTSTA,
PCI_EXP_SLTSTA_PDS);
pcie_cap_slot_event(d, PCI_EXP_HP_EV_PDC);
}
return 0;
}
/* 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);
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;
pci_bus_hotplug(pci_bridge_get_sec_bus(DO_UPCAST(PCIBridge, dev, dev)),
pcie_cap_slot_hotplug, &dev->qdev);
}
void pcie_cap_slot_reset(PCIDevice *dev)
{
uint8_t *exp_cap = dev->config + dev->exp.exp_cap;
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_PIC_OFF |
PCI_EXP_SLTCTL_AIC_OFF);
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_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);
}
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);
}
/*
* TODO: implement FLR:
* Right now sets the bit which indicates FLR is supported.
*/
/* 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_word_test_and_clear_mask(devctl, PCI_EXP_DEVCTL_BCR_FLR)) {
/* TODO: implement FLR */
}
}
/* Alternative Routing-ID Interpretation (ARI) */
/* ari forwarding support for down stream port */
void pcie_cap_ari_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_ari_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_ari_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 allocation 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)
{
uint16_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, PCI_ARI_CAP_NFN(nextfn));
}
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