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b3da71f21ea2be51be8e21b23bc0539eae0856ab
kata-containers/src/dragonball/src/dbs_pci/README.md
Chao Wu b3da71f21e dragonball: init dbs-pci lib with pci bus & pci conf 
This commit inits dbs-pci lib for Dragonball to use.
It contains several implementation now:

1. PCI configuration space
2. PCI bus

More info of the design & behavior of those two features could be found
in the README of dbs-pci.

fixes: #8479

Signed-off-by: Gerry Liu <gerry@linux.alibaba.com>
Signed-off-by: Zizheng Bian <zizheng.bian@linux.alibaba.com>
Signed-off-by: Shifang Feng <fengshifang@linux.alibaba.com>
Signed-off-by: Yang Su <yang.su@linux.alibaba.com>
Signed-off-by: Zha Bin <zhabin@linux.alibaba.com>
Signed-off-by: Xin Lin <jingshan@linux.alibaba.com>
Signed-off-by: Chao Wu <chaowu@linux.alibaba.com>
2023-11-30 23:40:26 +08:00

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dbs-pci

Introduction

dbs-pci is a crate for emulating PCI device.

There are several components in dbs-pci crate building together to emulate PCI device behaviour :

  1. device mod: mainly provide the trait for PciDevice, providing the ability to get id, write PCI configuration space, read PCI configuration space and as_any to downcast the trait object to the actual device type.

  2. configuration mod: simulate PCI device configuration header and manage PCI Bar configuration. The PCI Specification defines the organization of the 256-byte Configuration Space registers and imposes a specific template for the space. The first 64 bytes of configuration space are standardised as configuration space header.

  3. bus mod: simulate PCI buses, to simplify the implementation, PCI hierarchy is not supported. So all PCI devices are directly connected to the PCI root bus. PCI Bus has bus id, PCI devices attached and PCI bus I/O port, I/O mem resource use condition.