From: Wei Huang <wei.huang2@amd.com>
To: <linux-pci@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-doc@vger.kernel.org>, <netdev@vger.kernel.org>
Cc: <bhelgaas@google.com>, <corbet@lwn.net>, <davem@davemloft.net>,
<edumazet@google.com>, <kuba@kernel.org>, <pabeni@redhat.com>,
<alex.williamson@redhat.com>, <gospo@broadcom.com>,
<michael.chan@broadcom.com>, <ajit.khaparde@broadcom.com>,
<manoj.panicker2@amd.com>, <Eric.VanTassell@amd.com>,
<wei.huang2@amd.com>
Subject: [PATCH V1 0/9] PCIe TPH and cache direct injection support
Date: Thu, 9 May 2024 11:27:32 -0500 [thread overview]
Message-ID: <20240509162741.1937586-1-wei.huang2@amd.com> (raw)
Hi All,
TPH (TLP Processing Hints) is a PCIe feature that allows endpoint devices
to provide optimization hints for requests that target memory space. These
hints, in a format called steering tag (ST), are provided in the requester's
TLP headers and allow the system hardware, including the Root Complex, to
optimize the utilization of platform resources for the requests.
Upcoming AMD hardware implement a new Cache Injection feature that leverages
TPH. Cache Injection allows PCIe endpoints to inject I/O Coherent DMA writes
directly into an L2 within the CCX (core complex) closest to the CPU core
that will consume it. The technology is targeted at applications whose
performance is sensitive to the latency of inbound writes as seen by a CPU
core. The applications include networking and storage applications.
This series implements generic TPH support in Linux. It allows STs to be
retrieved from ACPI _DSM (defined by ACPI) and used by PCIe end-point
drivers as needed. As a demo, it includes an usage example in Broadcom BNXT
driver. When running on Broadcom NICs with proper firmware, Cache Injection
shows substantial memory bandwidth saving using real-world benchmarks.
Manoj Panicker (1):
bnxt_en: Add TPH support in BNXT driver
Michael Chan (1):
bnxt_en: Pass NQ ID to the FW when allocating RX/RX AGG rings
Wei Huang (7):
PCI: Introduce PCIe TPH support framework
PCI: Add TPH related register definition
PCI/TPH: Implement a command line option to disable TPH
PCI/TPH: Implement a command line option to force No ST Mode
PCI/TPH: Introduce API functions to get/set steering tags
PCI/TPH: Retrieve steering tag from ACPI _DSM
PCI/TPH: Add TPH documentation
Documentation/PCI/index.rst | 1 +
Documentation/PCI/tph.rst | 57 ++
.../admin-guide/kernel-parameters.txt | 2 +
Documentation/driver-api/pci/pci.rst | 3 +
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 59 +-
drivers/net/ethernet/broadcom/bnxt/bnxt.h | 4 +
drivers/pci/pci-driver.c | 12 +-
drivers/pci/pci.c | 24 +
drivers/pci/pci.h | 6 +
drivers/pci/pcie/Kconfig | 10 +
drivers/pci/pcie/Makefile | 1 +
drivers/pci/pcie/tph.c | 563 ++++++++++++++++++
drivers/pci/probe.c | 1 +
drivers/vfio/pci/vfio_pci_config.c | 7 +-
include/linux/pci-tph.h | 75 +++
include/linux/pci.h | 6 +
include/uapi/linux/pci_regs.h | 35 +-
17 files changed, 856 insertions(+), 10 deletions(-)
create mode 100644 Documentation/PCI/tph.rst
create mode 100644 drivers/pci/pcie/tph.c
create mode 100644 include/linux/pci-tph.h
--
2.44.0
next reply other threads:[~2024-05-09 16:27 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-09 16:27 Wei Huang [this message]
2024-05-09 16:27 ` [PATCH V1 1/9] PCI: Introduce PCIe TPH support framework Wei Huang
2024-05-09 16:27 ` [PATCH V1 2/9] PCI: Add TPH related register definition Wei Huang
2024-05-09 16:27 ` [PATCH V1 3/9] PCI/TPH: Implement a command line option to disable TPH Wei Huang
2024-05-09 16:27 ` [PATCH V1 4/9] PCI/TPH: Implement a command line option to force No ST Mode Wei Huang
2024-05-09 16:27 ` [PATCH V1 5/9] PCI/TPH: Introduce API functions to get/set steering tags Wei Huang
2024-05-10 3:07 ` kernel test robot
2024-05-11 20:15 ` Simon Horman
2024-05-13 13:29 ` Wei Huang
2024-05-09 16:27 ` [PATCH V1 6/9] PCI/TPH: Retrieve steering tag from ACPI _DSM Wei Huang
2024-05-10 4:20 ` kernel test robot
2024-05-10 5:24 ` kernel test robot
2024-05-09 16:27 ` [PATCH V1 7/9] PCI/TPH: Add TPH documentation Wei Huang
2024-05-15 12:11 ` Bagas Sanjaya
2024-05-09 16:27 ` [PATCH V1 8/9] bnxt_en: Add TPH support in BNXT driver Wei Huang
2024-05-09 21:50 ` Vadim Fedorenko
2024-05-10 3:55 ` Ajit Khaparde
2024-05-10 10:35 ` Vadim Fedorenko
2024-05-10 15:23 ` Andy Gospodarek
2024-05-10 20:03 ` David Wei
2024-05-10 20:33 ` Andy Gospodarek
2024-05-10 20:33 ` Vadim Fedorenko
2024-05-10 20:37 ` Andy Gospodarek
2024-05-10 3:10 ` Somnath Kotur
2024-05-09 16:27 ` [PATCH V1 9/9] bnxt_en: Pass NQ ID to the FW when allocating RX/RX AGG rings Wei Huang
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