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virtio: remove g_virtio_driver

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g_virtio_driver contained just a list of all
Virtio-SCSI devices. It's now being removed for
two reasons:
 * it's backend-specific, doesn't fit a generic virtio lib
 * it's difficult to ensure thread-safety for it

Virtio bdev modules will now manage their Virtio
devices by themselves. Virtio-SCSI has now an internal
device list. (And VirtioBlk module maps devices to
bdevs 1:1, so doesn't need any additional work here.)

Change-Id: I3bc68d76d6904df5c56f00fca7ab387871ecf88f
Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
Reviewed-on: https://review.gerrithub.io/405179
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
This commit is contained in:
Dariusz Stojaczyk 2018-03-23 13:49:35 +01:00 committed by Jim Harris
parent 0bc7c3de4b
commit 6ccc262022
3 changed files with 23 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
include/spdk_internal/virtio.h
View File

@ -91,8 +91,6 @@ struct virtio_dev {
/** Context for the backend ops */
void *ctx;
TAILQ_ENTRY(virtio_dev) tailq;
};
struct virtio_dev_ops {
@ -180,12 +178,6 @@ enum spdk_virtio_desc_type {
/* TODO VIRTIO_DESC_INDIRECT */
};
struct virtio_driver {
TAILQ_HEAD(, virtio_dev) scsi_devs;
};
extern struct virtio_driver g_virtio_driver;
/** Context for creating PCI virtio_devs */
struct virtio_pci_ctx;

52
lib/bdev/virtio/bdev_virtio_scsi.c
View File

@ -96,6 +96,8 @@ struct virtio_scsi_dev {
/** Context for the `remove_cb`. */
void *remove_ctx;
TAILQ_ENTRY(virtio_scsi_dev) tailq;
};
struct virtio_scsi_io_ctx {
@ -179,6 +181,9 @@ struct bdev_virtio_io_channel {
struct spdk_poller *poller;
};
TAILQ_HEAD(, virtio_scsi_dev) g_virtio_scsi_devs =
TAILQ_HEAD_INITIALIZER(g_virtio_scsi_devs);
/** Module finish in progress */
static bool g_bdev_virtio_finish = false;
@ -288,7 +293,7 @@ virtio_scsi_dev_init(struct virtio_scsi_dev *svdev, uint16_t max_queues)
bdev_virtio_scsi_ch_destroy_cb,
sizeof(struct bdev_virtio_io_channel));
TAILQ_INSERT_TAIL(&g_virtio_driver.scsi_devs, &svdev->vdev, tailq);
TAILQ_INSERT_TAIL(&g_virtio_scsi_devs, svdev, tailq);
return 0;
}
@ -410,12 +415,6 @@ static struct spdk_bdev_module virtio_scsi_if = {
SPDK_BDEV_MODULE_REGISTER(&virtio_scsi_if)
static struct virtio_scsi_dev *
virtio_dev_to_scsi(struct virtio_dev *vdev)
{
return SPDK_CONTAINEROF(vdev, struct virtio_scsi_dev, vdev);
}
static struct virtio_scsi_io_ctx *
bdev_virtio_init_io_vreq(struct spdk_io_channel *ch, struct spdk_bdev_io *bdev_io)
{
@ -1686,10 +1685,10 @@ bdev_virtio_initial_scan_complete(void *ctx __attribute__((unused)),
int result __attribute__((unused)),
struct spdk_bdev **bdevs __attribute__((unused)), size_t bdevs_cnt __attribute__((unused)))
{
struct virtio_dev *vdev;
struct virtio_scsi_dev *svdev;
TAILQ_FOREACH(vdev, &g_virtio_driver.scsi_devs, tailq) {
if (virtio_dev_to_scsi(vdev)->scan_ctx) {
TAILQ_FOREACH(svdev, &g_virtio_scsi_devs, tailq) {
if (svdev->scan_ctx) {
/* another device is still being scanned */
return;
}
@ -1701,8 +1700,7 @@ bdev_virtio_initial_scan_complete(void *ctx __attribute__((unused)),
static int
bdev_virtio_initialize(void)
{
struct virtio_scsi_dev *svdev;
struct virtio_dev *vdev, *next_vdev;
struct virtio_scsi_dev *svdev, *next_svdev;
int rc;
rc = bdev_virtio_process_config();
@ -1710,14 +1708,13 @@ bdev_virtio_initialize(void)
goto out;
}
if (TAILQ_EMPTY(&g_virtio_driver.scsi_devs)) {
if (TAILQ_EMPTY(&g_virtio_scsi_devs)) {
spdk_bdev_module_init_done(&virtio_scsi_if);
return 0;
}
/* Initialize all created devices and scan available targets */
TAILQ_FOREACH(vdev, &g_virtio_driver.scsi_devs, tailq) {
svdev = virtio_dev_to_scsi(vdev);
TAILQ_FOREACH(svdev, &g_virtio_scsi_devs, tailq) {
rc = virtio_scsi_dev_scan(svdev, bdev_virtio_initial_scan_complete, NULL);
if (rc != 0) {
goto out;
@ -1728,9 +1725,8 @@ bdev_virtio_initialize(void)
out:
/* Remove any created devices */
TAILQ_FOREACH_SAFE(vdev, &g_virtio_driver.scsi_devs, tailq, next_vdev) {
svdev = virtio_dev_to_scsi(vdev);
TAILQ_REMOVE(&g_virtio_driver.scsi_devs, vdev, tailq);
TAILQ_FOREACH_SAFE(svdev, &g_virtio_scsi_devs, tailq, next_svdev) {
TAILQ_REMOVE(&g_virtio_scsi_devs, svdev, tailq);
virtio_scsi_dev_remove(svdev, NULL, NULL);
}
@ -1765,7 +1761,7 @@ virtio_scsi_dev_unregister_cb(void *io_device)
virtio_dev_stop(vdev);
virtio_dev_destruct(vdev);
TAILQ_REMOVE(&g_virtio_driver.scsi_devs, vdev, tailq);
TAILQ_REMOVE(&g_virtio_scsi_devs, svdev, tailq);
remove_cb = svdev->remove_cb;
remove_ctx = svdev->remove_ctx;
spdk_dma_free(svdev->eventq_ios);
@ -1775,7 +1771,7 @@ virtio_scsi_dev_unregister_cb(void *io_device)
remove_cb(remove_ctx, 0);
}
finish_module = TAILQ_EMPTY(&g_virtio_driver.scsi_devs);
finish_module = TAILQ_EMPTY(&g_virtio_scsi_devs);
if (g_bdev_virtio_finish && finish_module) {
spdk_bdev_module_finish_done();
@ -1820,18 +1816,18 @@ virtio_scsi_dev_remove(struct virtio_scsi_dev *svdev,
static void
bdev_virtio_finish(void)
{
struct virtio_dev *vdev, *next;
struct virtio_scsi_dev *svdev, *next;
g_bdev_virtio_finish = true;
if (TAILQ_EMPTY(&g_virtio_driver.scsi_devs)) {
if (TAILQ_EMPTY(&g_virtio_scsi_devs)) {
spdk_bdev_module_finish_done();
return;
}
/* Defer module finish until all controllers are removed. */
TAILQ_FOREACH_SAFE(vdev, &g_virtio_driver.scsi_devs, tailq, next) {
virtio_scsi_dev_remove(virtio_dev_to_scsi(vdev), NULL, NULL);
TAILQ_FOREACH_SAFE(svdev, &g_virtio_scsi_devs, tailq, next) {
virtio_scsi_dev_remove(svdev, NULL, NULL);
}
}
@ -1899,12 +1895,10 @@ bdev_virtio_pci_scsi_dev_create(const char *name, struct spdk_pci_addr *pci_addr
void
bdev_virtio_scsi_dev_remove(const char *name, bdev_virtio_remove_cb cb_fn, void *cb_arg)
{
struct virtio_scsi_dev *svdev = NULL;
struct virtio_dev *vdev;
struct virtio_scsi_dev *svdev;
TAILQ_FOREACH(vdev, &g_virtio_driver.scsi_devs, tailq) {
if (strcmp(vdev->name, name) == 0) {
svdev = virtio_dev_to_scsi(vdev);
TAILQ_FOREACH(svdev, &g_virtio_scsi_devs, tailq) {
if (strcmp(svdev->vdev.name, name) == 0) {
break;
}
}

4
lib/virtio/virtio.c
View File

@ -65,10 +65,6 @@
#define virtio_rmb() spdk_smp_rmb()
#define virtio_wmb() spdk_smp_wmb()
struct virtio_driver g_virtio_driver = {
.scsi_devs = TAILQ_HEAD_INITIALIZER(g_virtio_driver.scsi_devs),
};
/* Chain all the descriptors in the ring with an END */
static inline void
vring_desc_init(struct vring_desc *dp, uint16_t n)