REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3907

This commit introduces EDKII_PCI_DEVICE_PPI. The purpose of this PPI is
to provide a way of accessing PCI devices to drvice drivers such as
NvmExpressPei or AhciPei.

Cc: Hao A Wu <hao.a.wu@...>
Cc: Ray Ni <ray.ni@...>
Cc: Liming Gao <gaoliming@...>
Signed-off-by: Maciej Czajkowski <maciej.czajkowski@...>
Acked-by: Hao A Wu <hao.a.wu@...>
---

Notes:
v2 changes:
- added acked-by tag
- minor change - modified header guard to follow coding style

MdeModulePkg/Include/Ppi/PciDevice.h | 32 ++++++++++++++++++++
MdeModulePkg/MdeModulePkg.dec | 3 ++
2 files changed, 35 insertions(+)

diff --git a/MdeModulePkg/Include/Ppi/PciDevice.h b/MdeModulePkg/Include/Ppi/PciDevice.h
new file mode 100644
index 000000000000..6750ae6ce394
--- /dev/null
+++ b/MdeModulePkg/Include/Ppi/PciDevice.h
@@ -0,0 +1,32 @@
+/** @file
+
+ Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef EDKII_PCI_DEVICE_PPI_H_
+#define EDKII_PCI_DEVICE_PPI_H_
+
+#include <Protocol/PciIo.h>
+#include <Protocol/DevicePath.h>
+
+///
+/// Global ID for the EDKII_PCI_DEVICE_PPI_GUID.
+///
+#define EDKII_PCI_DEVICE_PPI_GUID \
+ { \
+ 0x1597ab4f, 0xd542, 0x4efe, { 0x9a, 0xf7, 0xb2, 0x44, 0xec, 0x54, 0x4c, 0x0b } \
+ }
+
+///
+/// PCI Device PPI structure.
+///
+typedef struct {
+ EFI_PCI_IO_PROTOCOL PciIo;
+ EFI_DEVICE_PATH_PROTOCOL *DevicePath;
+} EDKII_PCI_DEVICE_PPI;
+
+extern EFI_GUID gEdkiiPeiPciDevicePpiGuid;
+
+#endif // EDKII_PCI_DEVICE_PPI_H_
diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index 2bcb9f9453af..7d989108324a 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -509,6 +509,9 @@ [Ppis]
## Include/Ppi/NvmExpressPassThru.h
gEdkiiPeiNvmExpressPassThruPpiGuid = { 0x6af31b2c, 0x3be, 0x46c1, { 0xb1, 0x2d, 0xea, 0x4a, 0x36, 0xdf, 0xa7, 0x4c } }

+ ## Include/Ppi/PciDevice.h
+ gEdkiiPeiPciDevicePpiGuid = { 0x1597ab4f, 0xd542, 0x4efe, { 0x9a, 0xf7, 0xb2, 0x44, 0xec, 0x54, 0x4c, 0x0b } }
+
## Include/Ppi/CapsuleOnDisk.h
gEdkiiPeiCapsuleOnDiskPpiGuid = { 0x71a9ea61, 0x5a35, 0x4a5d, { 0xac, 0xef, 0x9c, 0xf8, 0x6d, 0x6d, 0x67, 0xe0 } }
gEdkiiPeiBootInCapsuleOnDiskModePpiGuid = { 0xb08a11e4, 0xe2b7, 0x4b75, { 0xb5, 0x15, 0xaf, 0x61, 0x6, 0x68, 0xbf, 0xd1 } }
--
2.27.0.windows.1

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As previously mentioned in https://edk2.groups.io/g/devel/message/90345, the PPI interface looks good from the device controllers perspective:
Reviewed-by: Hao A Wu <hao.a.wu@...>

Sorry Ray and Liming, do you have additional comments for this newly introduced EDKII_PCI_DEVICE_PPI?

Best Regards,
Hao Wu