linux-kernel - [PATCH V3 2/4] vdpasim: customize allocation size

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Message-Id: <20221223055548.27810-3-jasowang@redhat.com>
Date:   Fri, 23 Dec 2022 13:55:46 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, jasowang@...hat.com
Cc:     sgarzare@...hat.com, eperezma@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH V3 2/4] vdpasim: customize allocation size

Allow individual simulator to customize the allocation size.

Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>
Acked-by: Eugenio Pérez <eperezma@...hat.com>
Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/vdpa/vdpa_sim/vdpa_sim.c     | 5 ++++-
 drivers/vdpa/vdpa_sim/vdpa_sim.h     | 1 +
 drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 1 +
 drivers/vdpa/vdpa_sim/vdpa_sim_net.c | 1 +
 4 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index 118dbc8e5d67..341da107e7da 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -254,6 +254,9 @@ struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr,
 	struct device *dev;
 	int i, ret = -ENOMEM;
 
+	if (!dev_attr->alloc_size)
+		return ERR_PTR(-EINVAL);
+
 	if (config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) {
 		if (config->device_features &
 		    ~dev_attr->supported_features)
@@ -269,7 +272,7 @@ struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr,
 
 	vdpa = __vdpa_alloc_device(NULL, ops,
 				   dev_attr->ngroups, dev_attr->nas,
-				   sizeof(struct vdpasim),
+				   dev_attr->alloc_size,
 				   dev_attr->name, false);
 	if (IS_ERR(vdpa)) {
 		ret = PTR_ERR(vdpa);
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.h b/drivers/vdpa/vdpa_sim/vdpa_sim.h
index 0e78737dcc16..51c070a543f1 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.h
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.h
@@ -37,6 +37,7 @@ struct vdpasim_dev_attr {
 	struct vdpa_mgmt_dev *mgmt_dev;
 	const char *name;
 	u64 supported_features;
+	size_t alloc_size;
 	size_t config_size;
 	size_t buffer_size;
 	int nvqs;
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
index f745926237a8..5117959bed8a 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
@@ -378,6 +378,7 @@ static int vdpasim_blk_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
 	dev_attr.nvqs = VDPASIM_BLK_VQ_NUM;
 	dev_attr.ngroups = VDPASIM_BLK_GROUP_NUM;
 	dev_attr.nas = VDPASIM_BLK_AS_NUM;
+	dev_attr.alloc_size = sizeof(struct vdpasim);
 	dev_attr.config_size = sizeof(struct virtio_blk_config);
 	dev_attr.get_config = vdpasim_blk_get_config;
 	dev_attr.work_fn = vdpasim_blk_work;
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
index e8a115fbe49f..5abd4efd9028 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
@@ -253,6 +253,7 @@ static int vdpasim_net_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
 	dev_attr.nvqs = VDPASIM_NET_VQ_NUM;
 	dev_attr.ngroups = VDPASIM_NET_GROUP_NUM;
 	dev_attr.nas = VDPASIM_NET_AS_NUM;
+	dev_attr.alloc_size = sizeof(struct vdpasim);
 	dev_attr.config_size = sizeof(struct virtio_net_config);
 	dev_attr.get_config = vdpasim_net_get_config;
 	dev_attr.work_fn = vdpasim_net_work;
-- 
2.25.1