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// SPDX-License-Identifier: GPL-2.0-only
#include <fcntl.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <linux/limits.h>
#include <linux/pci_regs.h>
#include <linux/sizes.h>
#include <linux/vfio.h>
#include <vfio_util.h>
#include "../kselftest_harness.h"
static const char *device_bdf;
/*
* Limit the number of MSIs enabled/disabled by the test regardless of the
* number of MSIs the device itself supports, e.g. to avoid hitting IRTE limits.
*/
#define MAX_TEST_MSI 16U
FIXTURE(vfio_pci_device_test) {
struct vfio_pci_device *device;
};
FIXTURE_SETUP(vfio_pci_device_test)
{
self->device = vfio_pci_device_init(device_bdf, default_iommu_mode);
}
FIXTURE_TEARDOWN(vfio_pci_device_test)
{
vfio_pci_device_cleanup(self->device);
}
#define read_pci_id_from_sysfs(_file) ({ \
char __sysfs_path[PATH_MAX]; \
char __buf[32]; \
int __fd; \
\
snprintf(__sysfs_path, PATH_MAX, "/sys/bus/pci/devices/%s/%s", device_bdf, _file); \
ASSERT_GT((__fd = open(__sysfs_path, O_RDONLY)), 0); \
ASSERT_GT(read(__fd, __buf, ARRAY_SIZE(__buf)), 0); \
ASSERT_EQ(0, close(__fd)); \
(u16)strtoul(__buf, NULL, 0); \
})
TEST_F(vfio_pci_device_test, config_space_read_write)
{
u16 vendor, device;
u16 command;
/* Check that Vendor and Device match what the kernel reports. */
vendor = read_pci_id_from_sysfs("vendor");
device = read_pci_id_from_sysfs("device");
ASSERT_TRUE(vfio_pci_device_match(self->device, vendor, device));
printf("Vendor: %04x, Device: %04x\n", vendor, device);
command = vfio_pci_config_readw(self->device, PCI_COMMAND);
ASSERT_FALSE(command & PCI_COMMAND_MASTER);
vfio_pci_config_writew(self->device, PCI_COMMAND, command | PCI_COMMAND_MASTER);
command = vfio_pci_config_readw(self->device, PCI_COMMAND);
ASSERT_TRUE(command & PCI_COMMAND_MASTER);
printf("Enabled Bus Mastering (command: %04x)\n", command);
vfio_pci_config_writew(self->device, PCI_COMMAND, command & ~PCI_COMMAND_MASTER);
command = vfio_pci_config_readw(self->device, PCI_COMMAND);
ASSERT_FALSE(command & PCI_COMMAND_MASTER);
printf("Disabled Bus Mastering (command: %04x)\n", command);
}
TEST_F(vfio_pci_device_test, validate_bars)
{
struct vfio_pci_bar *bar;
int i;
for (i = 0; i < PCI_STD_NUM_BARS; i++) {
bar = &self->device->bars[i];
if (!(bar->info.flags & VFIO_REGION_INFO_FLAG_MMAP)) {
printf("BAR %d does not support mmap()\n", i);
ASSERT_EQ(NULL, bar->vaddr);
continue;
}
/*
* BARs that support mmap() should be automatically mapped by
* vfio_pci_device_init().
*/
ASSERT_NE(NULL, bar->vaddr);
ASSERT_NE(0, bar->info.size);
printf("BAR %d mapped at %p (size 0x%llx)\n", i, bar->vaddr, bar->info.size);
}
}
FIXTURE(vfio_pci_irq_test) {
struct vfio_pci_device *device;
};
FIXTURE_VARIANT(vfio_pci_irq_test) {
int irq_index;
};
FIXTURE_VARIANT_ADD(vfio_pci_irq_test, msi) {
.irq_index = VFIO_PCI_MSI_IRQ_INDEX,
};
FIXTURE_VARIANT_ADD(vfio_pci_irq_test, msix) {
.irq_index = VFIO_PCI_MSIX_IRQ_INDEX,
};
FIXTURE_SETUP(vfio_pci_irq_test)
{
self->device = vfio_pci_device_init(device_bdf, default_iommu_mode);
}
FIXTURE_TEARDOWN(vfio_pci_irq_test)
{
vfio_pci_device_cleanup(self->device);
}
TEST_F(vfio_pci_irq_test, enable_trigger_disable)
{
bool msix = variant->irq_index == VFIO_PCI_MSIX_IRQ_INDEX;
int msi_eventfd;
u32 count;
u64 value;
int i;
if (msix)
count = self->device->msix_info.count;
else
count = self->device->msi_info.count;
count = min(count, MAX_TEST_MSI);
if (!count)
SKIP(return, "MSI%s: not supported\n", msix ? "-x" : "");
vfio_pci_irq_enable(self->device, variant->irq_index, 0, count);
printf("MSI%s: enabled %d interrupts\n", msix ? "-x" : "", count);
for (i = 0; i < count; i++) {
msi_eventfd = self->device->msi_eventfds[i];
fcntl_set_nonblock(msi_eventfd);
ASSERT_EQ(-1, read(msi_eventfd, &value, 8));
ASSERT_EQ(EAGAIN, errno);
vfio_pci_irq_trigger(self->device, variant->irq_index, i);
ASSERT_EQ(8, read(msi_eventfd, &value, 8));
ASSERT_EQ(1, value);
}
vfio_pci_irq_disable(self->device, variant->irq_index);
}
TEST_F(vfio_pci_device_test, reset)
{
if (!(self->device->info.flags & VFIO_DEVICE_FLAGS_RESET))
SKIP(return, "Device does not support reset\n");
vfio_pci_device_reset(self->device);
}
int main(int argc, char *argv[])
{
device_bdf = vfio_selftests_get_bdf(&argc, argv);
return test_harness_run(argc, argv);
}
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