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Date: Mon, 26 Feb 2024 11:49:59 -0500
From: Frank Li <Frank.li@....com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: Jingoo Han <jingoohan1@...il.com>,
Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Krzysztof Wilczyński <kw@...ux.com>,
Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.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>,
Kishon Vijay Abraham I <kishon@...com>,
Vidya Sagar <vidyas@...dia.com>,
Vignesh Raghavendra <vigneshr@...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>,
NXP Linux Team <linux-imx@....com>,
Minghuan Lian <minghuan.Lian@....com>,
Mingkai Hu <mingkai.hu@....com>, Roy Zang <roy.zang@....com>,
Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
Masami Hiramatsu <mhiramat@...nel.org>,
Kishon Vijay Abraham I <kishon@...nel.org>,
linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-renesas-soc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
linux-tegra@...r.kernel.org, linux-omap@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
Niklas Cassel <cassel@...nel.org>
Subject: Re: [PATCH v8 01/10] PCI: dwc: ep: Remove deinit() callback from
struct dw_pcie_ep_ops
On Sat, Feb 24, 2024 at 12:24:07PM +0530, Manivannan Sadhasivam wrote:
> deinit() callback was solely introduced for the pcie-rcar-gen4 driver where
> it is used to do platform specific resource deallocation. And this callback
> is called right at the end of the dw_pcie_ep_exit() API. So it doesn't
> matter whether it is called within or outside of dw_pcie_ep_exit() API.
>
> So let's remove this callback and directly call rcar_gen4_pcie_ep_deinit()
> in pcie-rcar-gen4 driver to do resource deallocation after the completion
> of dw_pcie_ep_exit() API in rcar_gen4_remove_dw_pcie_ep().
>
> This simplifies the DWC layer.
>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Reviewed-by: Frank Li <Frank.Li@....com>
> ---
> drivers/pci/controller/dwc/pcie-designware-ep.c | 9 +--------
> drivers/pci/controller/dwc/pcie-designware.h | 1 -
> drivers/pci/controller/dwc/pcie-rcar-gen4.c | 14 ++++++++------
> 3 files changed, 9 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
> index 5befed2dc02b..d305f9b4cdfe 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> @@ -575,9 +575,6 @@ void dw_pcie_ep_exit(struct dw_pcie_ep *ep)
> epc->mem->window.page_size);
>
> pci_epc_mem_exit(epc);
> -
> - if (ep->ops->deinit)
> - ep->ops->deinit(ep);
> }
> EXPORT_SYMBOL_GPL(dw_pcie_ep_exit);
>
> @@ -738,7 +735,7 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
> ep->page_size);
> if (ret < 0) {
> dev_err(dev, "Failed to initialize address space\n");
> - goto err_ep_deinit;
> + return ret;
> }
>
> ep->msi_mem = pci_epc_mem_alloc_addr(epc, &ep->msi_mem_phys,
> @@ -775,10 +772,6 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
> err_exit_epc_mem:
> pci_epc_mem_exit(epc);
>
> -err_ep_deinit:
> - if (ep->ops->deinit)
> - ep->ops->deinit(ep);
> -
> return ret;
> }
> EXPORT_SYMBOL_GPL(dw_pcie_ep_init);
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 26dae4837462..ab7431a37209 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -333,7 +333,6 @@ struct dw_pcie_rp {
> struct dw_pcie_ep_ops {
> void (*pre_init)(struct dw_pcie_ep *ep);
> void (*init)(struct dw_pcie_ep *ep);
> - void (*deinit)(struct dw_pcie_ep *ep);
> int (*raise_irq)(struct dw_pcie_ep *ep, u8 func_no,
> unsigned int type, u16 interrupt_num);
> const struct pci_epc_features* (*get_features)(struct dw_pcie_ep *ep);
> diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
> index e9166619b1f9..ac97d594ea47 100644
> --- a/drivers/pci/controller/dwc/pcie-rcar-gen4.c
> +++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
> @@ -352,11 +352,8 @@ static void rcar_gen4_pcie_ep_init(struct dw_pcie_ep *ep)
> dw_pcie_ep_reset_bar(pci, bar);
> }
>
> -static void rcar_gen4_pcie_ep_deinit(struct dw_pcie_ep *ep)
> +static void rcar_gen4_pcie_ep_deinit(struct rcar_gen4_pcie *rcar)
> {
> - struct dw_pcie *dw = to_dw_pcie_from_ep(ep);
> - struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw);
> -
> writel(0, rcar->base + PCIEDMAINTSTSEN);
> rcar_gen4_pcie_common_deinit(rcar);
> }
> @@ -408,7 +405,6 @@ static unsigned int rcar_gen4_pcie_ep_get_dbi2_offset(struct dw_pcie_ep *ep,
> static const struct dw_pcie_ep_ops pcie_ep_ops = {
> .pre_init = rcar_gen4_pcie_ep_pre_init,
> .init = rcar_gen4_pcie_ep_init,
> - .deinit = rcar_gen4_pcie_ep_deinit,
> .raise_irq = rcar_gen4_pcie_ep_raise_irq,
> .get_features = rcar_gen4_pcie_ep_get_features,
> .get_dbi_offset = rcar_gen4_pcie_ep_get_dbi_offset,
> @@ -418,18 +414,24 @@ static const struct dw_pcie_ep_ops pcie_ep_ops = {
> static int rcar_gen4_add_dw_pcie_ep(struct rcar_gen4_pcie *rcar)
> {
> struct dw_pcie_ep *ep = &rcar->dw.ep;
> + int ret;
>
> if (!IS_ENABLED(CONFIG_PCIE_RCAR_GEN4_EP))
> return -ENODEV;
>
> ep->ops = &pcie_ep_ops;
>
> - return dw_pcie_ep_init(ep);
> + ret = dw_pcie_ep_init(ep);
> + if (ret)
> + rcar_gen4_pcie_ep_deinit(rcar);
> +
> + return ret;
> }
>
> static void rcar_gen4_remove_dw_pcie_ep(struct rcar_gen4_pcie *rcar)
> {
> dw_pcie_ep_exit(&rcar->dw.ep);
> + rcar_gen4_pcie_ep_deinit(rcar);
> }
>
> /* Common */
>
> --
> 2.25.1
>
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