libqos: Added MSI-X support

Added MSI-X support for qtest PCI.
Added MSI-X support for virtio-pci.
Added MSI-X test case in virtio-blk-test.

Signed-off-by: Marc Marí <marc.mari.barcelo@gmail.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 109 insertions, 2 deletions

diff --git a/tests/libqos/pci.c b/tests/libqos/pci.c
index ce0b308a83..d5ce683d77 100644
--- a/tests/libqos/pci.c
+++ b/tests/libqos/pci.c
@@ -15,8 +15,6 @@
 #include "hw/pci/pci_regs.h"
 #include <glib.h>
 
-#include <stdio.h>
-
 void qpci_device_foreach(QPCIBus *bus, int vendor_id, int device_id,
                          void (*func)(QPCIDevice *dev, int devfn, void *data),
                          void *data)
@@ -75,6 +73,115 @@ void qpci_device_enable(QPCIDevice *dev)
     qpci_config_writew(dev, PCI_COMMAND, cmd);
 }
 
+uint8_t qpci_find_capability(QPCIDevice *dev, uint8_t id)
+{
+    uint8_t cap;
+    uint8_t addr = qpci_config_readb(dev, PCI_CAPABILITY_LIST);
+
+    do {
+        cap = qpci_config_readb(dev, addr);
+        if (cap != id) {
+            addr = qpci_config_readb(dev, addr + PCI_CAP_LIST_NEXT);
+        }
+    } while (cap != id && addr != 0);
+
+    return addr;
+}
+
+void qpci_msix_enable(QPCIDevice *dev)
+{
+    uint8_t addr;
+    uint16_t val;
+    uint32_t table;
+    uint8_t bir_table;
+    uint8_t bir_pba;
+    void *offset;
+
+    addr = qpci_find_capability(dev, PCI_CAP_ID_MSIX);
+    g_assert_cmphex(addr, !=, 0);
+
+    val = qpci_config_readw(dev, addr + PCI_MSIX_FLAGS);
+    qpci_config_writew(dev, addr + PCI_MSIX_FLAGS, val | PCI_MSIX_FLAGS_ENABLE);
+
+    table = qpci_config_readl(dev, addr + PCI_MSIX_TABLE);
+    bir_table = table & PCI_MSIX_FLAGS_BIRMASK;
+    offset = qpci_iomap(dev, bir_table, NULL);
+    dev->msix_table = offset + (table & ~PCI_MSIX_FLAGS_BIRMASK);
+
+    table = qpci_config_readl(dev, addr + PCI_MSIX_PBA);
+    bir_pba = table & PCI_MSIX_FLAGS_BIRMASK;
+    if (bir_pba != bir_table) {
+        offset = qpci_iomap(dev, bir_pba, NULL);
+    }
+    dev->msix_pba = offset + (table & ~PCI_MSIX_FLAGS_BIRMASK);
+
+    g_assert(dev->msix_table != NULL);
+    g_assert(dev->msix_pba != NULL);
+    dev->msix_enabled = true;
+}
+
+void qpci_msix_disable(QPCIDevice *dev)
+{
+    uint8_t addr;
+    uint16_t val;
+
+    g_assert(dev->msix_enabled);
+    addr = qpci_find_capability(dev, PCI_CAP_ID_MSIX);
+    g_assert_cmphex(addr, !=, 0);
+    val = qpci_config_readw(dev, addr + PCI_MSIX_FLAGS);
+    qpci_config_writew(dev, addr + PCI_MSIX_FLAGS,
+                                                val & ~PCI_MSIX_FLAGS_ENABLE);
+
+    qpci_iounmap(dev, dev->msix_table);
+    qpci_iounmap(dev, dev->msix_pba);
+    dev->msix_enabled = 0;
+    dev->msix_table = NULL;
+    dev->msix_pba = NULL;
+}
+
+bool qpci_msix_pending(QPCIDevice *dev, uint16_t entry)
+{
+    uint32_t pba_entry;
+    uint8_t bit_n = entry % 32;
+    void *addr = dev->msix_pba + (entry / 32) * PCI_MSIX_ENTRY_SIZE / 4;
+
+    g_assert(dev->msix_enabled);
+    pba_entry = qpci_io_readl(dev, addr);
+    qpci_io_writel(dev, addr, pba_entry & ~(1 << bit_n));
+    return (pba_entry & (1 << bit_n)) != 0;
+}
+
+bool qpci_msix_masked(QPCIDevice *dev, uint16_t entry)
+{
+    uint8_t addr;
+    uint16_t val;
+    void *vector_addr = dev->msix_table + (entry * PCI_MSIX_ENTRY_SIZE);
+
+    g_assert(dev->msix_enabled);
+    addr = qpci_find_capability(dev, PCI_CAP_ID_MSIX);
+    g_assert_cmphex(addr, !=, 0);
+    val = qpci_config_readw(dev, addr + PCI_MSIX_FLAGS);
+
+    if (val & PCI_MSIX_FLAGS_MASKALL) {
+        return true;
+    } else {
+        return (qpci_io_readl(dev, vector_addr + PCI_MSIX_ENTRY_VECTOR_CTRL)
+                                            & PCI_MSIX_ENTRY_CTRL_MASKBIT) != 0;
+    }
+}
+
+uint16_t qpci_msix_table_size(QPCIDevice *dev)
+{
+    uint8_t addr;
+    uint16_t control;
+
+    addr = qpci_find_capability(dev, PCI_CAP_ID_MSIX);
+    g_assert_cmphex(addr, !=, 0);
+
+    control = qpci_config_readw(dev, addr + PCI_MSIX_FLAGS);
+    return (control & PCI_MSIX_FLAGS_QSIZE) + 1;
+}
+
 uint8_t qpci_config_readb(QPCIDevice *dev, uint8_t offset)
 {
     return dev->bus->config_readb(dev->bus, dev->devfn, offset);