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vDPA/ifcvf: fetch device feature bits when probe 

This commit would read and store device feature
bits when probe.

rename ifcvf_get_features() to ifcvf_get_hw_features(),
it reads and stores features of the probed device.

new ifcvf_get_features() simply returns stored
feature bits.

Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210317094933.16417-6-lingshan.zhu@intel.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhu Lingshan 2021-03-17 17:49:31 +08:00 committed by Michael S. Tsirkin
parent 2f1b305070
commit 69d00d9858
3 changed files with 14 additions and 2 deletions
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12
drivers/vdpa/ifcvf/ifcvf_base.c
View File

@ -202,10 +202,11 @@ static void ifcvf_add_status(struct ifcvf_hw *hw, u8 status)
ifcvf_get_status(hw);
}
u64 ifcvf_get_features(struct ifcvf_hw *hw)
u64 ifcvf_get_hw_features(struct ifcvf_hw *hw)
{
struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
u32 features_lo, features_hi;
u64 features;
ifc_iowrite32(0, &cfg->device_feature_select);
features_lo = ifc_ioread32(&cfg->device_feature);
@ -213,7 +214,14 @@ u64 ifcvf_get_features(struct ifcvf_hw *hw)
ifc_iowrite32(1, &cfg->device_feature_select);
features_hi = ifc_ioread32(&cfg->device_feature);
return ((u64)features_hi << 32) | features_lo;
features = ((u64)features_hi << 32) | features_lo;
return features;
}
u64 ifcvf_get_features(struct ifcvf_hw *hw)
{
return hw->hw_features;
}
void ifcvf_read_net_config(struct ifcvf_hw *hw, u64 offset,

2
drivers/vdpa/ifcvf/ifcvf_base.h
View File

@ -83,6 +83,7 @@ struct ifcvf_hw {
void __iomem *notify_base;
u32 notify_off_multiplier;
u64 req_features;
u64 hw_features;
struct virtio_pci_common_cfg __iomem *common_cfg;
void __iomem *net_cfg;
struct vring_info vring[IFCVF_MAX_QUEUE_PAIRS * 2];
@ -121,6 +122,7 @@ void ifcvf_set_status(struct ifcvf_hw *hw, u8 status);
void io_write64_twopart(u64 val, u32 *lo, u32 *hi);
void ifcvf_reset(struct ifcvf_hw *hw);
u64 ifcvf_get_features(struct ifcvf_hw *hw);
u64 ifcvf_get_hw_features(struct ifcvf_hw *hw);
u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid);
int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num);
struct ifcvf_adapter *vf_to_adapter(struct ifcvf_hw *hw);

2
drivers/vdpa/ifcvf/ifcvf_main.c
View File

@ -457,6 +457,8 @@ static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++)
vf->vring[i].irq = -EINVAL;
vf->hw_features = ifcvf_get_hw_features(vf);
ret = vdpa_register_device(&adapter->vdpa, IFCVF_MAX_QUEUE_PAIRS * 2);
if (ret) {
IFCVF_ERR(pdev, "Failed to register ifcvf to vdpa bus");