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include/hw/pci/pcie_host: Correct PCIE_MMCFG_BUS_MASK 

According to [1] address bits 27 - 20 are mapped to the bus number (the
TLPs bus number field is 8 bits). Below is the formula taken from Table
7-1 in [1].

"
Memory Address | PCI Express Configuration Space
A[(20+n-1):20] | Bus Number, 1 ≤ n ≤ 8
"

[1] PCI Express® Base Specification Revision 5.0 Version 1.0

Signed-off-by: Francisco Iglesias <frasse.iglesias@gmail.com>
Message-Id: <20220411221836.17699-2-frasse.iglesias@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Francisco Iglesias 2022-04-12 00:18:35 +02:00 committed by Michael S. Tsirkin
parent 76b1b64370
commit 8e58f6ec24
1 changed files with 2 additions and 2 deletions
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4
include/hw/pci/pcie_host.h
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@ -60,7 +60,7 @@ void pcie_host_mmcfg_update(PCIExpressHost *e,
/*
* PCI express ECAM (Enhanced Configuration Address Mapping) format.
* AKA mmcfg address
* bit 20 - 28: bus number
* bit 20 - 27: bus number
* bit 15 - 19: device number
* bit 12 - 14: function number
* bit 0 - 11: offset in configuration space of a given device
@ -68,7 +68,7 @@ void pcie_host_mmcfg_update(PCIExpressHost *e,
#define PCIE_MMCFG_SIZE_MAX (1ULL << 29)
#define PCIE_MMCFG_SIZE_MIN (1ULL << 20)
#define PCIE_MMCFG_BUS_BIT 20
#define PCIE_MMCFG_BUS_MASK 0x1ff
#define PCIE_MMCFG_BUS_MASK 0xff
#define PCIE_MMCFG_DEVFN_BIT 12
#define PCIE_MMCFG_DEVFN_MASK 0xff
#define PCIE_MMCFG_CONFOFFSET_MASK 0xfff