linux-kernel - Re: [PATCH 2/5] PCI: endpoint: Introduce 'epc_deinit' event and notify the EPF drivers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240612043612.GC2645@thinkpad>
Date: Wed, 12 Jun 2024 10:06:12 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: Vignesh Raghavendra <vigneshr@...com>,
	Siddharth Vadapalli <s-vadapalli@...com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Richard Zhu <hongxing.zhu@....com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Minghuan Lian <minghuan.Lian@....com>,
	Mingkai Hu <mingkai.hu@....com>, Roy Zang <roy.zang@....com>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Srikanth Thokala <srikanth.thokala@...el.com>,
	Marek Vasut <marek.vasut+renesas@...il.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	linux-omap@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev, linuxppc-dev@...ts.ozlabs.org,
	linux-arm-kernel@...s.com, linux-arm-msm@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org, linux-tegra@...r.kernel.org,
	mhi@...ts.linux.dev, Niklas Cassel <cassel@...nel.org>
Subject: Re: [PATCH 2/5] PCI: endpoint: Introduce 'epc_deinit' event and
 notify the EPF drivers

On Tue, Jun 11, 2024 at 05:06:40PM -0500, Bjorn Helgaas wrote:
> On Thu, Jun 06, 2024 at 12:56:35PM +0530, Manivannan Sadhasivam wrote:
> > As like the 'epc_init' event, that is used to signal the EPF drivers about
> > the EPC initialization, let's introduce 'epc_deinit' event that is used to
> > signal EPC deinitialization.
> > 
> > The EPC deinitialization applies only when any sort of fundamental reset
> > is supported by the endpoint controller as per the PCIe spec.
> > 
> > Reference: PCIe Base spec v5.0, sections 4.2.4.9.1 and 6.6.1.
> 
> PCIe r6.0, sec 4.2.5.9.1 and 6.6.1.
> 
> (Not 4.2.4.9.1, which no longer exists in r6.x)
> 

Ammended the commit in pci/endpoint, thanks!

- Mani

> > Currently, some EPC drivers like pcie-qcom-ep and pcie-tegra194 support
> > PERST# as the fundamental reset. So the 'deinit' event will be notified to
> > the EPF drivers when PERST# assert happens in the above mentioned EPC
> > drivers.
> > 
> > The EPF drivers, on receiving the event through the epc_deinit() callback
> > should reset the EPF state machine and also cleanup any configuration that
> > got affected by the fundamental reset like BAR, DMA etc...
> > 
> > This change also warrants skipping the cleanups in unbind() if already done
> > in epc_deinit().
> > 
> > Reviewed-by: Niklas Cassel <cassel@...nel.org>
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

-- 
மணிவண்ணன் சதாசிவம்