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Message-ID: <20220224212314.1326-11-gdawar@xilinx.com>
Date: Fri, 25 Feb 2022 02:52:50 +0530
From: Gautam Dawar <gautam.dawar@...inx.com>
To: unlisted-recipients:; (no To-header on input)
CC: <gdawar@...inx.com>, <martinh@...inx.com>, <hanand@...inx.com>,
<tanujk@...inx.com>, <eperezma@...hat.com>,
Jason Wang <jasowang@...hat.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
Zhu Lingshan <lingshan.zhu@...el.com>,
Stefano Garzarella <sgarzare@...hat.com>,
Xie Yongji <xieyongji@...edance.com>,
Eli Cohen <elic@...dia.com>,
Si-Wei Liu <si-wei.liu@...cle.com>,
Parav Pandit <parav@...dia.com>,
Longpeng <longpeng2@...wei.com>,
<virtualization@...ts.linux-foundation.org>,
<linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>,
<netdev@...r.kernel.org>
Subject: [RFC PATCH v2 10/19] vhost-vdpa: introduce asid based IOTLB
This patch converts the vhost-vDPA device to support multiple IOTLBs
tagged via ASID via hlist. This will be used for supporting multiple
address spaces in the following patches.
Signed-off-by: Jason Wang <jasowang@...hat.com>
Signed-off-by: Gautam Dawar <gdawar@...inx.com>
---
drivers/vhost/vdpa.c | 104 ++++++++++++++++++++++++++++++++-----------
1 file changed, 79 insertions(+), 25 deletions(-)
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index d0aacc0cc79a..4e8b7c4809cd 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -33,13 +33,21 @@ enum {
#define VHOST_VDPA_DEV_MAX (1U << MINORBITS)
+#define VHOST_VDPA_IOTLB_BUCKETS 16
+
+struct vhost_vdpa_as {
+ struct hlist_node hash_link;
+ struct vhost_iotlb iotlb;
+ u32 id;
+};
+
struct vhost_vdpa {
struct vhost_dev vdev;
struct iommu_domain *domain;
struct vhost_virtqueue *vqs;
struct completion completion;
struct vdpa_device *vdpa;
- struct vhost_iotlb *iotlb;
+ struct hlist_head as[VHOST_VDPA_IOTLB_BUCKETS];
struct device dev;
struct cdev cdev;
atomic_t opened;
@@ -49,12 +57,64 @@ struct vhost_vdpa {
struct eventfd_ctx *config_ctx;
int in_batch;
struct vdpa_iova_range range;
+ int used_as;
};
static DEFINE_IDA(vhost_vdpa_ida);
static dev_t vhost_vdpa_major;
+static struct vhost_vdpa_as *asid_to_as(struct vhost_vdpa *v, u32 asid)
+{
+ struct hlist_head *head = &v->as[asid % VHOST_VDPA_IOTLB_BUCKETS];
+ struct vhost_vdpa_as *as;
+
+ hlist_for_each_entry(as, head, hash_link)
+ if (as->id == asid)
+ return as;
+
+ return NULL;
+}
+
+static struct vhost_vdpa_as *vhost_vdpa_alloc_as(struct vhost_vdpa *v, u32 asid)
+{
+ struct hlist_head *head = &v->as[asid % VHOST_VDPA_IOTLB_BUCKETS];
+ struct vhost_vdpa_as *as;
+
+ if (asid_to_as(v, asid))
+ return NULL;
+
+ as = kmalloc(sizeof(*as), GFP_KERNEL);
+ if (!as)
+ return NULL;
+
+ vhost_iotlb_init(&as->iotlb, 0, 0);
+ as->id = asid;
+ hlist_add_head(&as->hash_link, head);
+ ++v->used_as;
+
+ return as;
+}
+
+static int vhost_vdpa_remove_as(struct vhost_vdpa *v, u32 asid)
+{
+ struct vhost_vdpa_as *as = asid_to_as(v, asid);
+
+ /* Remove default address space is not allowed */
+ if (asid == 0)
+ return -EINVAL;
+
+ if (!as)
+ return -EINVAL;
+
+ hlist_del(&as->hash_link);
+ vhost_iotlb_reset(&as->iotlb);
+ kfree(as);
+ --v->used_as;
+
+ return 0;
+}
+
static void handle_vq_kick(struct vhost_work *work)
{
struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
@@ -554,15 +614,6 @@ static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v,
return vhost_vdpa_pa_unmap(v, iotlb, start, last);
}
-static void vhost_vdpa_iotlb_free(struct vhost_vdpa *v)
-{
- struct vhost_iotlb *iotlb = v->iotlb;
-
- vhost_vdpa_iotlb_unmap(v, iotlb, 0ULL, 0ULL - 1);
- kfree(v->iotlb);
- v->iotlb = NULL;
-}
-
static int perm_to_iommu_flags(u32 perm)
{
int flags = 0;
@@ -842,7 +893,8 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev, u32 asid,
struct vhost_vdpa *v = container_of(dev, struct vhost_vdpa, vdev);
struct vdpa_device *vdpa = v->vdpa;
const struct vdpa_config_ops *ops = vdpa->config;
- struct vhost_iotlb *iotlb = v->iotlb;
+ struct vhost_vdpa_as *as = asid_to_as(v, 0);
+ struct vhost_iotlb *iotlb = &as->iotlb;
int r = 0;
mutex_lock(&dev->mutex);
@@ -953,6 +1005,13 @@ static void vhost_vdpa_set_iova_range(struct vhost_vdpa *v)
}
}
+static void vhost_vdpa_cleanup(struct vhost_vdpa *v)
+{
+ vhost_dev_cleanup(&v->vdev);
+ kfree(v->vdev.vqs);
+ vhost_vdpa_remove_as(v, 0);
+}
+
static int vhost_vdpa_open(struct inode *inode, struct file *filep)
{
struct vhost_vdpa *v;
@@ -985,15 +1044,12 @@ static int vhost_vdpa_open(struct inode *inode, struct file *filep)
vhost_dev_init(dev, vqs, nvqs, 0, 0, 0, false,
vhost_vdpa_process_iotlb_msg);
- v->iotlb = vhost_iotlb_alloc(0, 0);
- if (!v->iotlb) {
- r = -ENOMEM;
- goto err_init_iotlb;
- }
+ if (!vhost_vdpa_alloc_as(v, 0))
+ goto err_alloc_as;
r = vhost_vdpa_alloc_domain(v);
if (r)
- goto err_alloc_domain;
+ goto err_alloc_as;
vhost_vdpa_set_iova_range(v);
@@ -1001,11 +1057,8 @@ static int vhost_vdpa_open(struct inode *inode, struct file *filep)
return 0;
-err_alloc_domain:
- vhost_vdpa_iotlb_free(v);
-err_init_iotlb:
- vhost_dev_cleanup(&v->vdev);
- kfree(vqs);
+err_alloc_as:
+ vhost_vdpa_cleanup(v);
err:
atomic_dec(&v->opened);
return r;
@@ -1029,11 +1082,9 @@ static int vhost_vdpa_release(struct inode *inode, struct file *filep)
vhost_vdpa_clean_irq(v);
vhost_vdpa_reset(v);
vhost_dev_stop(&v->vdev);
- vhost_vdpa_iotlb_free(v);
vhost_vdpa_free_domain(v);
vhost_vdpa_config_put(v);
vhost_dev_cleanup(&v->vdev);
- kfree(v->vdev.vqs);
mutex_unlock(&d->mutex);
atomic_dec(&v->opened);
@@ -1129,7 +1180,7 @@ static int vhost_vdpa_probe(struct vdpa_device *vdpa)
const struct vdpa_config_ops *ops = vdpa->config;
struct vhost_vdpa *v;
int minor;
- int r;
+ int i, r;
/* Only support 1 address space and 1 groups */
if (vdpa->ngroups != 1 || vdpa->nas != 1)
@@ -1177,6 +1228,9 @@ static int vhost_vdpa_probe(struct vdpa_device *vdpa)
init_completion(&v->completion);
vdpa_set_drvdata(vdpa, v);
+ for (i = 0; i < VHOST_VDPA_IOTLB_BUCKETS; i++)
+ INIT_HLIST_HEAD(&v->as[i]);
+
return 0;
err:
--
2.25.0
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