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libqos: add iteration support to qpci_find_capability()

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VIRTIO 1.0 PCI devices have multiple PCI_CAP_ID_VNDR capabilities so we
need a way to iterate over them.  Extend qpci_find_capability() to take
the last address.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
--
v3:
 * Document qpci_find_capability()
Message-Id: <20191023100425.12168-11-stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2019-10-23 11:04:19 +01:00 • committed by Michael S. Tsirkin
parent bccd82b407
commit a32a028aa7
2 changed files with 25 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

30
tests/libqos/pci.c
View file

@ -115,10 +115,28 @@ void qpci_device_enable(QPCIDevice *dev)
g_assert_cmphex(cmd & PCI_COMMAND_MASTER, ==, PCI_COMMAND_MASTER); g_assert_cmphex(cmd & PCI_COMMAND_MASTER, ==, PCI_COMMAND_MASTER);
} }
uint8_t qpci_find_capability(QPCIDevice *dev, uint8_t id) /**
* qpci_find_capability:
* @dev: the PCI device
* @id: the PCI Capability ID (PCI_CAP_ID_*)
* @start_addr: 0 to begin iteration or the last return value to continue
* iteration
*
* Iterate over the PCI Capabilities List.
*
* Returns: PCI Configuration Space offset of the capabililty structure or
* 0 if no further matching capability is found
*/
uint8_t qpci_find_capability(QPCIDevice *dev, uint8_t id, uint8_t start_addr)
{ {
uint8_t cap; uint8_t cap;
uint8_t addr = qpci_config_readb(dev, PCI_CAPABILITY_LIST); uint8_t addr;
if (start_addr) {
addr = qpci_config_readb(dev, start_addr + PCI_CAP_LIST_NEXT);
} else {
addr = qpci_config_readb(dev, PCI_CAPABILITY_LIST);
}
do { do {
cap = qpci_config_readb(dev, addr); cap = qpci_config_readb(dev, addr);
@ -138,7 +156,7 @@ void qpci_msix_enable(QPCIDevice *dev)
uint8_t bir_table; uint8_t bir_table;
uint8_t bir_pba; uint8_t bir_pba;
addr = qpci_find_capability(dev, PCI_CAP_ID_MSIX); addr = qpci_find_capability(dev, PCI_CAP_ID_MSIX, 0);
g_assert_cmphex(addr, !=, 0); g_assert_cmphex(addr, !=, 0);
val = qpci_config_readw(dev, addr + PCI_MSIX_FLAGS); val = qpci_config_readw(dev, addr + PCI_MSIX_FLAGS);
@ -167,7 +185,7 @@ void qpci_msix_disable(QPCIDevice *dev)
uint16_t val; uint16_t val;
g_assert(dev->msix_enabled); g_assert(dev->msix_enabled);
addr = qpci_find_capability(dev, PCI_CAP_ID_MSIX); addr = qpci_find_capability(dev, PCI_CAP_ID_MSIX, 0);
g_assert_cmphex(addr, !=, 0); g_assert_cmphex(addr, !=, 0);
val = qpci_config_readw(dev, addr + PCI_MSIX_FLAGS); val = qpci_config_readw(dev, addr + PCI_MSIX_FLAGS);
qpci_config_writew(dev, addr + PCI_MSIX_FLAGS, qpci_config_writew(dev, addr + PCI_MSIX_FLAGS,
@ -203,7 +221,7 @@ bool qpci_msix_masked(QPCIDevice *dev, uint16_t entry)
uint64_t vector_off = dev->msix_table_off + entry * PCI_MSIX_ENTRY_SIZE; uint64_t vector_off = dev->msix_table_off + entry * PCI_MSIX_ENTRY_SIZE;
g_assert(dev->msix_enabled); g_assert(dev->msix_enabled);
addr = qpci_find_capability(dev, PCI_CAP_ID_MSIX); addr = qpci_find_capability(dev, PCI_CAP_ID_MSIX, 0);
g_assert_cmphex(addr, !=, 0); g_assert_cmphex(addr, !=, 0);
val = qpci_config_readw(dev, addr + PCI_MSIX_FLAGS); val = qpci_config_readw(dev, addr + PCI_MSIX_FLAGS);
@ -221,7 +239,7 @@ uint16_t qpci_msix_table_size(QPCIDevice *dev)
uint8_t addr; uint8_t addr;
uint16_t control; uint16_t control;
addr = qpci_find_capability(dev, PCI_CAP_ID_MSIX); addr = qpci_find_capability(dev, PCI_CAP_ID_MSIX, 0);
g_assert_cmphex(addr, !=, 0); g_assert_cmphex(addr, !=, 0);
control = qpci_config_readw(dev, addr + PCI_MSIX_FLAGS); control = qpci_config_readw(dev, addr + PCI_MSIX_FLAGS);

2
tests/libqos/pci.h
View file

@ -86,7 +86,7 @@ bool qpci_has_buggy_msi(QPCIDevice *dev);
bool qpci_check_buggy_msi(QPCIDevice *dev); bool qpci_check_buggy_msi(QPCIDevice *dev);
void qpci_device_enable(QPCIDevice *dev); void qpci_device_enable(QPCIDevice *dev);
uint8_t qpci_find_capability(QPCIDevice *dev, uint8_t id); uint8_t qpci_find_capability(QPCIDevice *dev, uint8_t id, uint8_t start_addr);
void qpci_msix_enable(QPCIDevice *dev); void qpci_msix_enable(QPCIDevice *dev);
void qpci_msix_disable(QPCIDevice *dev); void qpci_msix_disable(QPCIDevice *dev);
bool qpci_msix_pending(QPCIDevice *dev, uint16_t entry); bool qpci_msix_pending(QPCIDevice *dev, uint16_t entry);