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msi: Add msi_get_message()

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vfio-pci and pci-assign both do this on their own for setting up
direct MSI injection through KVM.  Provide a helper function for
this in MSI code.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Alex Williamson 2012-10-02 13:22:07 -06:00 committed by Michael S. Tsirkin
parent 4774d7b258
commit 39b9bc626a
2 changed files with 30 additions and 16 deletions
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45
hw/msi.c
View file

@ -122,6 +122,31 @@ void msi_set_message(PCIDevice *dev, MSIMessage msg)
pci_set_word(dev->config + msi_data_off(dev, msi64bit), msg.data);
}
MSIMessage msi_get_message(PCIDevice *dev, unsigned int vector)
{
uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev));
bool msi64bit = flags & PCI_MSI_FLAGS_64BIT;
unsigned int nr_vectors = msi_nr_vectors(flags);
MSIMessage msg;
assert(vector < nr_vectors);
if (msi64bit) {
msg.address = pci_get_quad(dev->config + msi_address_lo_off(dev));
} else {
msg.address = pci_get_long(dev->config + msi_address_lo_off(dev));
}
/* upper bit 31:16 is zero */
msg.data = pci_get_word(dev->config + msi_data_off(dev, msi64bit));
if (nr_vectors > 1) {
msg.data &= ~(nr_vectors - 1);
msg.data |= vector;
}
return msg;
}
bool msi_enabled(const PCIDevice *dev)
{
return msi_present(dev) &&
@ -249,8 +274,7 @@ void msi_notify(PCIDevice *dev, unsigned int vector)
uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev));
bool msi64bit = flags & PCI_MSI_FLAGS_64BIT;
unsigned int nr_vectors = msi_nr_vectors(flags);
uint64_t address;
uint32_t data;
MSIMessage msg;
assert(vector < nr_vectors);
if (msi_is_masked(dev, vector)) {
@ -261,24 +285,13 @@ void msi_notify(PCIDevice *dev, unsigned int vector)
return;
}
if (msi64bit) {
address = pci_get_quad(dev->config + msi_address_lo_off(dev));
} else {
address = pci_get_long(dev->config + msi_address_lo_off(dev));
}
/* upper bit 31:16 is zero */
data = pci_get_word(dev->config + msi_data_off(dev, msi64bit));
if (nr_vectors > 1) {
data &= ~(nr_vectors - 1);
data |= vector;
}
msg = msi_get_message(dev, vector);
MSI_DEV_PRINTF(dev,
"notify vector 0x%x"
" address: 0x%"PRIx64" data: 0x%"PRIx32"\n",
vector, address, data);
stl_le_phys(address, data);
vector, msg.address, msg.data);
stl_le_phys(msg.address, msg.data);
}
/* Normally called by pci_default_write_config(). */

1
hw/msi.h
View file

@ -32,6 +32,7 @@ struct MSIMessage {
extern bool msi_supported;
void msi_set_message(PCIDevice *dev, MSIMessage msg);
MSIMessage msi_get_message(PCIDevice *dev, unsigned int vector);
bool msi_enabled(const PCIDevice *dev);
int msi_init(struct PCIDevice *dev, uint8_t offset,
unsigned int nr_vectors, bool msi64bit, bool msi_per_vector_mask);