1 files changed, 104 insertions, 20 deletions

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index c7334cc65bb2..62d640327145 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -24,6 +24,7 @@
 #include <linux/etherdevice.h>
 #include <linux/vringh.h>
 #include <linux/vdpa.h>
+#include <linux/virtio_byteorder.h>
 #include <linux/vhost_iotlb.h>
 #include <uapi/linux/virtio_config.h>
 #include <uapi/linux/virtio_net.h>
@@ -33,6 +34,10 @@
 #define DRV_DESC     "vDPA Device Simulator"
 #define DRV_LICENSE  "GPL v2"
 
+static int batch_mapping = 1;
+module_param(batch_mapping, int, 0444);
+MODULE_PARM_DESC(batch_mapping, "Batched mapping 1 -Enable; 0 - Disable");
+
 struct vdpasim_virtqueue {
 	struct vringh vring;
 	struct vringh_kiov iov;
@@ -55,12 +60,12 @@ struct vdpasim_virtqueue {
 
 static u64 vdpasim_features = (1ULL << VIRTIO_F_ANY_LAYOUT) |
 			      (1ULL << VIRTIO_F_VERSION_1)  |
-			      (1ULL << VIRTIO_F_IOMMU_PLATFORM);
+			      (1ULL << VIRTIO_F_ACCESS_PLATFORM);
 
 /* State of each vdpasim device */
 struct vdpasim {
 	struct vdpa_device vdpa;
-	struct vdpasim_virtqueue vqs[2];
+	struct vdpasim_virtqueue vqs[VDPASIM_VQ_NUM];
 	struct work_struct work;
 	/* spinlock to synchronize virtqueue state */
 	spinlock_t lock;
@@ -70,8 +75,27 @@ struct vdpasim {
 	u32 status;
 	u32 generation;
 	u64 features;
+	/* spinlock to synchronize iommu table */
+	spinlock_t iommu_lock;
 };
 
+/* TODO: cross-endian support */
+static inline bool vdpasim_is_little_endian(struct vdpasim *vdpasim)
+{
+	return virtio_legacy_is_little_endian() ||
+		(vdpasim->features & (1ULL << VIRTIO_F_VERSION_1));
+}
+
+static inline u16 vdpasim16_to_cpu(struct vdpasim *vdpasim, __virtio16 val)
+{
+	return __virtio16_to_cpu(vdpasim_is_little_endian(vdpasim), val);
+}
+
+static inline __virtio16 cpu_to_vdpasim16(struct vdpasim *vdpasim, u16 val)
+{
+	return __cpu_to_virtio16(vdpasim_is_little_endian(vdpasim), val);
+}
+
 static struct vdpasim *vdpasim_dev;
 
 static struct vdpasim *vdpa_to_sim(struct vdpa_device *vdpa)
@@ -118,7 +142,9 @@ static void vdpasim_reset(struct vdpasim *vdpasim)
 	for (i = 0; i < VDPASIM_VQ_NUM; i++)
 		vdpasim_vq_reset(&vdpasim->vqs[i]);
 
+	spin_lock(&vdpasim->iommu_lock);
 	vhost_iotlb_reset(vdpasim->iommu);
+	spin_unlock(&vdpasim->iommu_lock);
 
 	vdpasim->features = 0;
 	vdpasim->status = 0;
@@ -236,8 +262,10 @@ static dma_addr_t vdpasim_map_page(struct device *dev, struct page *page,
 	/* For simplicity, use identical mapping to avoid e.g iova
 	 * allocator.
 	 */
+	spin_lock(&vdpasim->iommu_lock);
 	ret = vhost_iotlb_add_range(iommu, pa, pa + size - 1,
 				    pa, dir_to_perm(dir));
+	spin_unlock(&vdpasim->iommu_lock);
 	if (ret)
 		return DMA_MAPPING_ERROR;
 
@@ -251,8 +279,10 @@ static void vdpasim_unmap_page(struct device *dev, dma_addr_t dma_addr,
 	struct vdpasim *vdpasim = dev_to_sim(dev);
 	struct vhost_iotlb *iommu = vdpasim->iommu;
 
+	spin_lock(&vdpasim->iommu_lock);
 	vhost_iotlb_del_range(iommu, (u64)dma_addr,
 			      (u64)dma_addr + size - 1);
+	spin_unlock(&vdpasim->iommu_lock);
 }
 
 static void *vdpasim_alloc_coherent(struct device *dev, size_t size,
@@ -264,9 +294,10 @@ static void *vdpasim_alloc_coherent(struct device *dev, size_t size,
 	void *addr = kmalloc(size, flag);
 	int ret;
 
-	if (!addr)
+	spin_lock(&vdpasim->iommu_lock);
+	if (!addr) {
 		*dma_addr = DMA_MAPPING_ERROR;
-	else {
+	} else {
 		u64 pa = virt_to_phys(addr);
 
 		ret = vhost_iotlb_add_range(iommu, (u64)pa,
@@ -279,6 +310,7 @@ static void *vdpasim_alloc_coherent(struct device *dev, size_t size,
 		} else
 			*dma_addr = (dma_addr_t)pa;
 	}
+	spin_unlock(&vdpasim->iommu_lock);
 
 	return addr;
 }
@@ -290,8 +322,11 @@ static void vdpasim_free_coherent(struct device *dev, size_t size,
 	struct vdpasim *vdpasim = dev_to_sim(dev);
 	struct vhost_iotlb *iommu = vdpasim->iommu;
 
+	spin_lock(&vdpasim->iommu_lock);
 	vhost_iotlb_del_range(iommu, (u64)dma_addr,
 			      (u64)dma_addr + size - 1);
+	spin_unlock(&vdpasim->iommu_lock);
+
 	kfree(phys_to_virt((uintptr_t)dma_addr));
 }
 
@@ -303,21 +338,27 @@ static const struct dma_map_ops vdpasim_dma_ops = {
 };
 
 static const struct vdpa_config_ops vdpasim_net_config_ops;
+static const struct vdpa_config_ops vdpasim_net_batch_config_ops;
 
 static struct vdpasim *vdpasim_create(void)
 {
-	struct virtio_net_config *config;
+	const struct vdpa_config_ops *ops;
 	struct vdpasim *vdpasim;
 	struct device *dev;
 	int ret = -ENOMEM;
 
-	vdpasim = vdpa_alloc_device(struct vdpasim, vdpa, NULL,
-				    &vdpasim_net_config_ops);
+	if (batch_mapping)
+		ops = &vdpasim_net_batch_config_ops;
+	else
+		ops = &vdpasim_net_config_ops;
+
+	vdpasim = vdpa_alloc_device(struct vdpasim, vdpa, NULL, ops, VDPASIM_VQ_NUM);
 	if (!vdpasim)
 		goto err_alloc;
 
 	INIT_WORK(&vdpasim->work, vdpasim_work);
 	spin_lock_init(&vdpasim->lock);
+	spin_lock_init(&vdpasim->iommu_lock);
 
 	dev = &vdpasim->vdpa.dev;
 	dev->coherent_dma_mask = DMA_BIT_MASK(64);
@@ -331,10 +372,7 @@ static struct vdpasim *vdpasim_create(void)
 	if (!vdpasim->buffer)
 		goto err_iommu;
 
-	config = &vdpasim->config;
-	config->mtu = 1500;
-	config->status = VIRTIO_NET_S_LINK_UP;
-	eth_random_addr(config->mac);
+	eth_random_addr(vdpasim->config.mac);
 
 	vringh_set_iotlb(&vdpasim->vqs[0].vring, vdpasim->iommu);
 	vringh_set_iotlb(&vdpasim->vqs[1].vring, vdpasim->iommu);
@@ -413,26 +451,29 @@ static bool vdpasim_get_vq_ready(struct vdpa_device *vdpa, u16 idx)
 	return vq->ready;
 }
 
-static int vdpasim_set_vq_state(struct vdpa_device *vdpa, u16 idx, u64 state)
+static int vdpasim_set_vq_state(struct vdpa_device *vdpa, u16 idx,
+				const struct vdpa_vq_state *state)
 {
 	struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 	struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 	struct vringh *vrh = &vq->vring;
 
 	spin_lock(&vdpasim->lock);
-	vrh->last_avail_idx = state;
+	vrh->last_avail_idx = state->avail_index;
 	spin_unlock(&vdpasim->lock);
 
 	return 0;
 }
 
-static u64 vdpasim_get_vq_state(struct vdpa_device *vdpa, u16 idx)
+static int vdpasim_get_vq_state(struct vdpa_device *vdpa, u16 idx,
+				struct vdpa_vq_state *state)
 {
 	struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 	struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
 	struct vringh *vrh = &vq->vring;
 
-	return vrh->last_avail_idx;
+	state->avail_index = vrh->last_avail_idx;
+	return 0;
 }
 
 static u32 vdpasim_get_vq_align(struct vdpa_device *vdpa)
@@ -448,13 +489,22 @@ static u64 vdpasim_get_features(struct vdpa_device *vdpa)
 static int vdpasim_set_features(struct vdpa_device *vdpa, u64 features)
 {
 	struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+	struct virtio_net_config *config = &vdpasim->config;
 
 	/* DMA mapping must be done by driver */
-	if (!(features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
+	if (!(features & (1ULL << VIRTIO_F_ACCESS_PLATFORM)))
 		return -EINVAL;
 
 	vdpasim->features = features & vdpasim_features;
 
+	/* We generally only know whether guest is using the legacy interface
+	 * here, so generally that's the earliest we can set config fields.
+	 * Note: We actually require VIRTIO_F_ACCESS_PLATFORM above which
+	 * implies VIRTIO_F_VERSION_1, but let's not try to be clever here.
+	 */
+
+	config->mtu = cpu_to_vdpasim16(vdpasim, 1500);
+	config->status = cpu_to_vdpasim16(vdpasim, VIRTIO_NET_S_LINK_UP);
 	return 0;
 }
 
@@ -508,7 +558,7 @@ static void vdpasim_get_config(struct vdpa_device *vdpa, unsigned int offset,
 	struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 
 	if (offset + len < sizeof(struct virtio_net_config))
-		memcpy(buf, &vdpasim->config + offset, len);
+		memcpy(buf, (u8 *)&vdpasim->config + offset, len);
 }
 
 static void vdpasim_set_config(struct vdpa_device *vdpa, unsigned int offset,
@@ -532,6 +582,7 @@ static int vdpasim_set_map(struct vdpa_device *vdpa,
 	u64 start = 0ULL, last = 0ULL - 1;
 	int ret;
 
+	spin_lock(&vdpasim->iommu_lock);
 	vhost_iotlb_reset(vdpasim->iommu);
 
 	for (map = vhost_iotlb_itree_first(iotlb, start, last); map;
@@ -541,10 +592,12 @@ static int vdpasim_set_map(struct vdpa_device *vdpa,
 		if (ret)
 			goto err;
 	}
+	spin_unlock(&vdpasim->iommu_lock);
 	return 0;
 
 err:
 	vhost_iotlb_reset(vdpasim->iommu);
+	spin_unlock(&vdpasim->iommu_lock);
 	return ret;
 }
 
@@ -552,16 +605,23 @@ static int vdpasim_dma_map(struct vdpa_device *vdpa, u64 iova, u64 size,
 			   u64 pa, u32 perm)
 {
 	struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+	int ret;
+
+	spin_lock(&vdpasim->iommu_lock);
+	ret = vhost_iotlb_add_range(vdpasim->iommu, iova, iova + size - 1, pa,
+				    perm);
+	spin_unlock(&vdpasim->iommu_lock);
 
-	return vhost_iotlb_add_range(vdpasim->iommu, iova,
-				     iova + size - 1, pa, perm);
+	return ret;
 }
 
 static int vdpasim_dma_unmap(struct vdpa_device *vdpa, u64 iova, u64 size)
 {
 	struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 
+	spin_lock(&vdpasim->iommu_lock);
 	vhost_iotlb_del_range(vdpasim->iommu, iova, iova + size - 1);
+	spin_unlock(&vdpasim->iommu_lock);
 
 	return 0;
 }
@@ -597,12 +657,36 @@ static const struct vdpa_config_ops vdpasim_net_config_ops = {
 	.get_config             = vdpasim_get_config,
 	.set_config             = vdpasim_set_config,
 	.get_generation         = vdpasim_get_generation,
-	.set_map                = vdpasim_set_map,
 	.dma_map                = vdpasim_dma_map,
 	.dma_unmap              = vdpasim_dma_unmap,
 	.free                   = vdpasim_free,
 };
 
+static const struct vdpa_config_ops vdpasim_net_batch_config_ops = {
+	.set_vq_address         = vdpasim_set_vq_address,
+	.set_vq_num             = vdpasim_set_vq_num,
+	.kick_vq                = vdpasim_kick_vq,
+	.set_vq_cb              = vdpasim_set_vq_cb,
+	.set_vq_ready           = vdpasim_set_vq_ready,
+	.get_vq_ready           = vdpasim_get_vq_ready,
+	.set_vq_state           = vdpasim_set_vq_state,
+	.get_vq_state           = vdpasim_get_vq_state,
+	.get_vq_align           = vdpasim_get_vq_align,
+	.get_features           = vdpasim_get_features,
+	.set_features           = vdpasim_set_features,
+	.set_config_cb          = vdpasim_set_config_cb,
+	.get_vq_num_max         = vdpasim_get_vq_num_max,
+	.get_device_id          = vdpasim_get_device_id,
+	.get_vendor_id          = vdpasim_get_vendor_id,
+	.get_status             = vdpasim_get_status,
+	.set_status             = vdpasim_set_status,
+	.get_config             = vdpasim_get_config,
+	.set_config             = vdpasim_set_config,
+	.get_generation         = vdpasim_get_generation,
+	.set_map                = vdpasim_set_map,
+	.free                   = vdpasim_free,
+};
+
 static int __init vdpasim_dev_init(void)
 {
 	vdpasim_dev = vdpasim_create();