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pci/aer: fix error injection 

Fix the injection logic upon aer message to follow 6.2.4.1.2 more
closely: specifically only send an msi interrupt when the logical or of
the enabled bits changed, not when a bit which was previously clear
becomes set.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
This commit is contained in:
Michael S. Tsirkin 2010-12-08 17:46:25 +09:00
parent 624c716cc5
commit c3f33667a6
1 changed files with 35 additions and 16 deletions
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51
hw/pcie_aer.c
View File

@ -257,6 +257,22 @@ static unsigned int pcie_aer_root_get_vector(PCIDevice *dev)
return (root_status & PCI_ERR_ROOT_IRQ) >> PCI_ERR_ROOT_IRQ_SHIFT;
}
/* Given a status register, get corresponding bits in the command register */
static uint32_t pcie_aer_status_to_cmd(uint32_t status)
{
uint32_t cmd = 0;
if (status & PCI_ERR_ROOT_COR_RCV) {
cmd |= PCI_ERR_ROOT_CMD_COR_EN;
}
if (status & PCI_ERR_ROOT_NONFATAL_RCV) {
cmd |= PCI_ERR_ROOT_CMD_NONFATAL_EN;
}
if (status & PCI_ERR_ROOT_FATAL_RCV) {
cmd |= PCI_ERR_ROOT_CMD_FATAL_EN;
}
return cmd;
}
/*
* return value:
* true: error message is sent up
@ -272,14 +288,14 @@ static bool pcie_aer_msg_root_port(PCIDevice *dev, const PCIEAERMsg *msg)
uint16_t cmd;
uint8_t *aer_cap;
uint32_t root_cmd;
uint32_t root_status;
uint32_t root_status, prev_status;
bool msi_trigger;
msg_sent = false;
cmd = pci_get_word(dev->config + PCI_COMMAND);
aer_cap = dev->config + dev->exp.aer_cap;
root_cmd = pci_get_long(aer_cap + PCI_ERR_ROOT_COMMAND);
root_status = pci_get_long(aer_cap + PCI_ERR_ROOT_STATUS);
prev_status = root_status = pci_get_long(aer_cap + PCI_ERR_ROOT_STATUS);
msi_trigger = false;
if (cmd & PCI_COMMAND_SERR) {
@ -337,20 +353,23 @@ static bool pcie_aer_msg_root_port(PCIDevice *dev, const PCIEAERMsg *msg)
}
pci_set_long(aer_cap + PCI_ERR_ROOT_STATUS, root_status);
if (root_cmd & msg->severity) {
/* 6.2.4.1.2 Interrupt Generation */
if (msix_enabled(dev)) {
if (msi_trigger) {
msix_notify(dev, pcie_aer_root_get_vector(dev));
}
} else if (msi_enabled(dev)) {
if (msi_trigger) {
msi_notify(dev, pcie_aer_root_get_vector(dev));
}
} else {
qemu_set_irq(dev->irq[dev->exp.aer_intx], 1);
}
msg_sent = true;
/* 6.2.4.1.2 Interrupt Generation */
/* All the above did was set some bits in the status register.
* Specifically these that match message severity.
* The below code relies on this fact. */
if (!(root_cmd & msg->severity) ||
(pcie_aer_status_to_cmd(prev_status) & root_cmd)) {
/* Condition is not being set or was already true so nothing to do. */
return msg_sent;
}
msg_sent = true;
if (msix_enabled(dev)) {
msix_notify(dev, pcie_aer_root_get_vector(dev));
} else if (msi_enabled(dev)) {
msi_notify(dev, pcie_aer_root_get_vector(dev));
} else {
qemu_set_irq(dev->irq[dev->exp.aer_intx], 1);
}
return msg_sent;
}