lkml.org 
[lkml]   [2024]   [May]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH V1 0/9] PCIe TPH and cache direct injection support
Date
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


\
 
 \ /
  Last update: 2024-05-09 18:29    [W:0.140 / U:0.040 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site