Re: [PATCH v22 net-next 05/12] net/nebula-matrix: add common resource implementation

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---
--- Patch [5]: [PATCH v22 net-next 05/12] net/nebula-matrix: add common resource implementation ---
commit d40e580d6fb636a87bb6f2eb1a3079e1e85c78a0
Author: illusion wang <[email protected]>

net/nebula-matrix: add common resource implementation

The patch introduces the common resource implementation for the Nebula
Matrix driver. It provides conversions among vsi_id, func_id, eth_id,
and pf_id, and sets up initialization for the control devices.

> diff --git a/drivers/net/ethernet/nebula-matrix/nbl/nbl_hw/nbl_hw_leonis/nbl_hw_leonis.c b/drivers/net/ethernet/nebula-matrix/nbl/nbl_hw/nbl_hw_leonis/nbl_hw_leonis.c
> index b37df49f86c80..4c7eea24c70ed 100644
> --- a/drivers/net/ethernet/nebula-matrix/nbl/nbl_hw/nbl_hw_leonis/nbl_hw_leonis.c
> +++ b/drivers/net/ethernet/nebula-matrix/nbl/nbl_hw/nbl_hw_leonis/nbl_hw_leonis.c
[ ... ]
> @@ -133,6 +154,14 @@ static u32 nbl_hw_get_host_pf_mask(struct nbl_hw_mgt *hw_mgt)
>  	return data;
>  }
>  
> +static u8 nbl_hw_get_real_bus(struct nbl_hw_mgt *hw_mgt)
> +{
> +	u32 data;
> +
> +	data = nbl_hw_rd32(hw_mgt, NBL_PCIE_HOST_TL_CFG_BUSDEV);

[Severity: High]
Will this cause a kernel panic due to an out-of-bounds MMIO read?

During device initialization, nbl_res_ctrl_dev_sriov_info_init() calls
hw_ops->get_real_bus(), which performs an MMIO read on
NBL_PCIE_HOST_TL_CFG_BUSDEV.

Since NBL_PCIE_HOST_TL_CFG_BUSDEV is defined using NBL_INTF_HOST_PCIE_BASE
(which is roughly a 21 MiB offset), and the driver only maps a 16 MiB PCI
BAR during nbl_hw_init_leonis(), this appears to read from an unmapped
physical address.

Similarly, the call to hw_ops->get_host_pf_mask() from nbl_res_init_pf_num()
will read from NBL_PCIE_HOST_K_PF_MASK_REG, which also evaluates to an
out-of-bounds register address.

> +	return FIELD_GET(NBL_PCIE_BUS_MASK, data);
> +}
> +