linux-kernel - [RFC PATCH v4 0/4] PCI/ASPM: Remove struct aspm

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Message-Id: <20211106175305.25565-1-refactormyself@gmail.com>
Date:   Sat,  6 Nov 2021 18:53:01 +0100
From:   "Saheed O. Bolarinwa" <refactormyself@...il.com>
To:     helgaas@...nel.org
Cc:     "Bolarinwa O. Saheed" <refactormyself@...il.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v4 0/4] PCI/ASPM: Remove struct aspm_latency

From: "Bolarinwa O. Saheed" <refactormyself@...il.com>

To validate and set link latency capability, `struct aspm_latency` and
related members defined within `struct pcie_link_state` are used.
However, since there are not many access to theses values, it is
possible to directly access and compute these values.

Doing this will also reduce the dependency on `struct pcie_link_state`.

The series removes `struct aspm_latency` and related members within
`struct pcie_link_state`. All latencies are now calculated when needed.

VERSION CHANGES:
- v2:
»       - directly access downstream by calling `pci_function_0()`
»         instead of using the `struct pcie_link_state`

- v3:
»       - rebase on Linux 5.15-rc2

- v4 (this version)
	- Create a seprate path to move pci_function_0() upward

MERGE NOTICE:
These series are based on
»       'commit e4e737bb5c17 ("Linux 5.15-rc2")'

Saheed O. Bolarinwa (4):
  PCI/ASPM: Move pci_function_0() upward
  PCI/ASPM: Do not cache link latencies
  PCI/ASPM: Remove struct pcie_link_state.acceptable
  PCI/ASPM: Remove struct aspm_latency

 drivers/pci/pcie/aspm.c | 88 +++++++++++++++++------------------------
 1 file changed, 37 insertions(+), 51 deletions(-)

-- 
2.20.1