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Date: Fri, 8 Mar 2024 11:17:19 +0000
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 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>, 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>, Jesper Nilsson <jesper.nilsson@...s.com>, Srikanth
Thokala <srikanth.thokala@...el.com>
CC: "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>, "linuxppc-dev@...ts.ozlabs.org"
<linuxppc-dev@...ts.ozlabs.org>, Niklas Cassel <cassel@...nel.org>,
"linux-arm-kernel@...s.com" <linux-arm-kernel@...s.com>, Frank Li
<Frank.Li@....com>
Subject: RE: [PATCH v9 01/10] PCI: dwc: ep: Remove deinit() callback from
struct dw_pcie_ep_ops
Hello Manivannan,
> From: Manivannan Sadhasivam, Sent: Monday, March 4, 2024 6:22 PM
>
> 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.
>
> Reviewed-by: Frank Li <Frank.Li@....com>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Thank you for the patch!
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Best regards,
Yoshihiro Shimoda
> ---
> 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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