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hw/vfio/pci: handle reset at VFIODevice 

Since we can potentially have both PCI and platform devices in
the same VFIO group, this latter now owns a list of VFIODevices.
A unified reset handler, vfio_reset_handler, is registered, looping
through this VFIODevice list. 2 specialized operations are introduced
(vfio_compute_needs_reset and vfio_hot_reset_multi): they allow to
implement type specific behavior. also reset_works and needs_reset
VFIOPCIDevice fields are moved into VFIODevice.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Eric Auger 2014-12-22 09:54:35 -07:00 committed by Alex Williamson
parent 462037c9e8
commit b47d8efa9f
1 changed files with 63 additions and 30 deletions
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93
hw/vfio/pci.c
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@ -189,13 +189,24 @@ typedef struct VFIOMSIXInfo {
void *mmap;
} VFIOMSIXInfo;
typedef struct VFIODeviceOps VFIODeviceOps;
typedef struct VFIODevice {
QLIST_ENTRY(VFIODevice) next;
struct VFIOGroup *group;
char *name;
int fd;
int type;
bool reset_works;
bool needs_reset;
VFIODeviceOps *ops;
} VFIODevice;
struct VFIODeviceOps {
void (*vfio_compute_needs_reset)(VFIODevice *vdev);
int (*vfio_hot_reset_multi)(VFIODevice *vdev);
};
typedef struct VFIOPCIDevice {
PCIDevice pdev;
VFIODevice vbasedev;
@ -214,19 +225,16 @@ typedef struct VFIOPCIDevice {
VFIOBAR bars[PCI_NUM_REGIONS - 1]; /* No ROM */
VFIOVGA vga; /* 0xa0000, 0x3b0, 0x3c0 */
PCIHostDeviceAddress host;
QLIST_ENTRY(VFIOPCIDevice) next;
EventNotifier err_notifier;
uint32_t features;
#define VFIO_FEATURE_ENABLE_VGA_BIT 0
#define VFIO_FEATURE_ENABLE_VGA (1 << VFIO_FEATURE_ENABLE_VGA_BIT)
int32_t bootindex;
uint8_t pm_cap;
bool reset_works;
bool has_vga;
bool pci_aer;
bool has_flr;
bool has_pm_reset;
bool needs_reset;
bool rom_read_failed;
} VFIOPCIDevice;
@ -234,7 +242,7 @@ typedef struct VFIOGroup {
int fd;
int groupid;
VFIOContainer *container;
QLIST_HEAD(, VFIOPCIDevice) device_list;
QLIST_HEAD(, VFIODevice) device_list;
QLIST_ENTRY(VFIOGroup) next;
QLIST_ENTRY(VFIOGroup) container_next;
} VFIOGroup;
@ -3381,7 +3389,7 @@ static int vfio_pci_hot_reset(VFIOPCIDevice *vdev, bool single)
single ? "one" : "multi");
vfio_pci_pre_reset(vdev);
vdev->needs_reset = false;
vdev->vbasedev.needs_reset = false;
info = g_malloc0(sizeof(*info));
info->argsz = sizeof(*info);
@ -3418,6 +3426,7 @@ static int vfio_pci_hot_reset(VFIOPCIDevice *vdev, bool single)
for (i = 0; i < info->count; i++) {
PCIHostDeviceAddress host;
VFIOPCIDevice *tmp;
VFIODevice *vbasedev_iter;
host.domain = devices[i].segment;
host.bus = devices[i].bus;
@ -3449,7 +3458,11 @@ static int vfio_pci_hot_reset(VFIOPCIDevice *vdev, bool single)
}
/* Prep dependent devices for reset and clear our marker. */
QLIST_FOREACH(tmp, &group->device_list, next) {
QLIST_FOREACH(vbasedev_iter, &group->device_list, next) {
if (vbasedev_iter->type != VFIO_DEVICE_TYPE_PCI) {
continue;
}
tmp = container_of(vbasedev_iter, VFIOPCIDevice, vbasedev);
if (vfio_pci_host_match(&host, &tmp->host)) {
if (single) {
error_report("vfio: found another in-use device "
@ -3459,7 +3472,7 @@ static int vfio_pci_hot_reset(VFIOPCIDevice *vdev, bool single)
goto out_single;
}
vfio_pci_pre_reset(tmp);
tmp->needs_reset = false;
tmp->vbasedev.needs_reset = false;
multi = true;
break;
}
@ -3512,6 +3525,7 @@ out:
for (i = 0; i < info->count; i++) {
PCIHostDeviceAddress host;
VFIOPCIDevice *tmp;
VFIODevice *vbasedev_iter;
host.domain = devices[i].segment;
host.bus = devices[i].bus;
@ -3532,7 +3546,11 @@ out:
break;
}
QLIST_FOREACH(tmp, &group->device_list, next) {
QLIST_FOREACH(vbasedev_iter, &group->device_list, next) {
if (vbasedev_iter->type != VFIO_DEVICE_TYPE_PCI) {
continue;
}
tmp = container_of(vbasedev_iter, VFIOPCIDevice, vbasedev);
if (vfio_pci_host_match(&host, &tmp->host)) {
vfio_pci_post_reset(tmp);
break;
@ -3566,28 +3584,40 @@ static int vfio_pci_hot_reset_one(VFIOPCIDevice *vdev)
return vfio_pci_hot_reset(vdev, true);
}
static int vfio_pci_hot_reset_multi(VFIOPCIDevice *vdev)
static int vfio_pci_hot_reset_multi(VFIODevice *vbasedev)
{
VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
return vfio_pci_hot_reset(vdev, false);
}
static void vfio_pci_reset_handler(void *opaque)
static void vfio_pci_compute_needs_reset(VFIODevice *vbasedev)
{
VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
if (!vbasedev->reset_works || (!vdev->has_flr && vdev->has_pm_reset)) {
vbasedev->needs_reset = true;
}
}
static VFIODeviceOps vfio_pci_ops = {
.vfio_compute_needs_reset = vfio_pci_compute_needs_reset,
.vfio_hot_reset_multi = vfio_pci_hot_reset_multi,
};
static void vfio_reset_handler(void *opaque)
{
VFIOGroup *group;
VFIOPCIDevice *vdev;
VFIODevice *vbasedev;
QLIST_FOREACH(group, &group_list, next) {
QLIST_FOREACH(vdev, &group->device_list, next) {
if (!vdev->reset_works || (!vdev->has_flr && vdev->has_pm_reset)) {
vdev->needs_reset = true;
}
QLIST_FOREACH(vbasedev, &group->device_list, next) {
vbasedev->ops->vfio_compute_needs_reset(vbasedev);
}
}
QLIST_FOREACH(group, &group_list, next) {
QLIST_FOREACH(vdev, &group->device_list, next) {
if (vdev->needs_reset) {
vfio_pci_hot_reset_multi(vdev);
QLIST_FOREACH(vbasedev, &group->device_list, next) {
if (vbasedev->needs_reset) {
vbasedev->ops->vfio_hot_reset_multi(vbasedev);
}
}
}
@ -3876,7 +3906,7 @@ static VFIOGroup *vfio_get_group(int groupid, AddressSpace *as)
}
if (QLIST_EMPTY(&group_list)) {
qemu_register_reset(vfio_pci_reset_handler, NULL);
qemu_register_reset(vfio_reset_handler, NULL);
}
QLIST_INSERT_HEAD(&group_list, group, next);
@ -3908,7 +3938,7 @@ static void vfio_put_group(VFIOGroup *group)
g_free(group);
if (QLIST_EMPTY(&group_list)) {
qemu_unregister_reset(vfio_pci_reset_handler, NULL);
qemu_unregister_reset(vfio_reset_handler, NULL);
}
}
@ -3931,7 +3961,7 @@ static int vfio_get_device(VFIOGroup *group, const char *name,
vdev->vbasedev.fd = ret;
vdev->vbasedev.group = group;
QLIST_INSERT_HEAD(&group->device_list, vdev, next);
QLIST_INSERT_HEAD(&group->device_list, &vdev->vbasedev, next);
/* Sanity check device */
ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_INFO, &dev_info);
@ -3948,7 +3978,7 @@ static int vfio_get_device(VFIOGroup *group, const char *name,
goto error;
}
vdev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
vdev->vbasedev.reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
if (dev_info.num_regions < VFIO_PCI_CONFIG_REGION_INDEX + 1) {
error_report("vfio: unexpected number of io regions %u",
@ -4059,7 +4089,7 @@ static int vfio_get_device(VFIOGroup *group, const char *name,
error:
if (ret) {
QLIST_REMOVE(vdev, next);
QLIST_REMOVE(&vdev->vbasedev, next);
vdev->vbasedev.group = NULL;
close(vdev->vbasedev.fd);
}
@ -4068,7 +4098,7 @@ error:
static void vfio_put_device(VFIOPCIDevice *vdev)
{
QLIST_REMOVE(vdev, next);
QLIST_REMOVE(&vdev->vbasedev, next);
vdev->vbasedev.group = NULL;
trace_vfio_put_device(vdev->vbasedev.fd);
close(vdev->vbasedev.fd);
@ -4186,7 +4216,8 @@ static void vfio_unregister_err_notifier(VFIOPCIDevice *vdev)
static int vfio_initfn(PCIDevice *pdev)
{
VFIOPCIDevice *pvdev, *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
VFIODevice *vbasedev_iter;
VFIOGroup *group;
char path[PATH_MAX], iommu_group_path[PATH_MAX], *group_name;
ssize_t len;
@ -4204,6 +4235,8 @@ static int vfio_initfn(PCIDevice *pdev)
return -errno;
}
vdev->vbasedev.ops = &vfio_pci_ops;
vdev->vbasedev.type = VFIO_DEVICE_TYPE_PCI;
vdev->vbasedev.name = g_strdup_printf("%04x:%02x:%02x.%01x",
vdev->host.domain, vdev->host.bus,
@ -4238,9 +4271,8 @@ static int vfio_initfn(PCIDevice *pdev)
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function);
QLIST_FOREACH(pvdev, &group->device_list, next) {
if (strcmp(pvdev->vbasedev.name, vdev->vbasedev.name) == 0) {
QLIST_FOREACH(vbasedev_iter, &group->device_list, next) {
if (strcmp(vbasedev_iter->name, vdev->vbasedev.name) == 0) {
error_report("vfio: error: device %s is already attached", path);
vfio_put_group(group);
return -EBUSY;
@ -4368,7 +4400,8 @@ static void vfio_pci_reset(DeviceState *dev)
vfio_pci_pre_reset(vdev);
if (vdev->reset_works && (vdev->has_flr || !vdev->has_pm_reset) &&
if (vdev->vbasedev.reset_works &&
(vdev->has_flr || !vdev->has_pm_reset) &&
!ioctl(vdev->vbasedev.fd, VFIO_DEVICE_RESET)) {
trace_vfio_pci_reset_flr(vdev->host.domain, vdev->host.bus,
vdev->host.slot, vdev->host.function);
@ -4381,7 +4414,7 @@ static void vfio_pci_reset(DeviceState *dev)
}
/* If nothing else works and the device supports PM reset, use it */
if (vdev->reset_works && vdev->has_pm_reset &&
if (vdev->vbasedev.reset_works && vdev->has_pm_reset &&
!ioctl(vdev->vbasedev.fd, VFIO_DEVICE_RESET)) {
trace_vfio_pci_reset_pm(vdev->host.domain, vdev->host.bus,
vdev->host.slot, vdev->host.function);