Date:   Thu, 3 Aug 2017 16:19:25 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Richard Zhu <hongxing.zhu@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Murali Karicheri <m-karicheri2@...com>,
        Minghuan Lian <minghuan.Lian@...escale.com>,
        Mingkai Hu <mingkai.hu@...escale.com>,
        Roy Zang <tie-fei.zang@...escale.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Niklas Cassel <niklas.cassel@...s.com>,
        Jesper Nilsson <jesper.nilsson@...s.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Xiaowei Song <songxiaowei@...ilicon.com>,
        Binghui Wang <wangbinghui@...ilicon.com>,
        Stanimir Varbanov <svarbanov@...sol.com>,
        Pratyush Anand <pratyush.anand@...il.com>,
        "moderated list:PCI DRIVER FOR SAMSUNG EXYNOS" 
        <linux-samsung-soc@...r.kernel.org>,
        "open list:PCI DRIVER FOR TI DRA7XX" <linux-pci@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:PCIE DRIVER FOR AXIS ARTPEC" <linux-arm-kernel@...s.com>,
        "open list:PCIE DRIVER FOR QUALCOMM MSM" 
        <linux-arm-msm@...r.kernel.org>,
        "open list:PCI DRIVER FOR TI DRA7XX" <linux-omap@...r.kernel.org>,
        "open list:PCI DRIVER FOR FREESCALE LAYERSCAPE" 
        <linuxppc-dev@...ts.ozlabs.org>,
        "moderated list:PCI DRIVER FOR SAMSUNG EXYNOS" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/3] PCI: dwc: Handle host_init failures

On Sat, Jul 15, 2017 at 11:39:45PM -0700, Bjorn Andersson wrote:
> In several dwc based drivers host_init can fail, so make sure to
> propagate and handle this to avoid continuing operation of a driver or
> hardware in an invalid state.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Applied patches 1-3 to pci/host-designware for v4.14, thanks!

> ---
>  drivers/pci/dwc/pci-dra7xx.c           |  4 +++-
>  drivers/pci/dwc/pci-exynos.c           |  4 +++-
>  drivers/pci/dwc/pci-imx6.c             |  4 +++-
>  drivers/pci/dwc/pci-keystone.c         |  4 +++-
>  drivers/pci/dwc/pci-layerscape.c       | 14 ++++++++++----
>  drivers/pci/dwc/pcie-armada8k.c        |  4 +++-
>  drivers/pci/dwc/pcie-artpec6.c         |  4 +++-
>  drivers/pci/dwc/pcie-designware-host.c |  7 +++++--
>  drivers/pci/dwc/pcie-designware-plat.c |  4 +++-
>  drivers/pci/dwc/pcie-designware.h      |  2 +-
>  drivers/pci/dwc/pcie-kirin.c           |  4 +++-
>  drivers/pci/dwc/pcie-qcom.c            |  6 ++++--
>  drivers/pci/dwc/pcie-spear13xx.c       |  4 +++-
>  13 files changed, 47 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
> index f2fc5f47064e..e8c13bb76169 100644
> --- a/drivers/pci/dwc/pci-dra7xx.c
> +++ b/drivers/pci/dwc/pci-dra7xx.c
> @@ -195,7 +195,7 @@ static void dra7xx_pcie_enable_interrupts(struct dra7xx_pcie *dra7xx)
>  	dra7xx_pcie_enable_msi_interrupts(dra7xx);
>  }
>  
> -static void dra7xx_pcie_host_init(struct pcie_port *pp)
> +static int dra7xx_pcie_host_init(struct pcie_port *pp)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
> @@ -206,6 +206,8 @@ static void dra7xx_pcie_host_init(struct pcie_port *pp)
>  	dw_pcie_wait_for_link(pci);
>  	dw_pcie_msi_init(pp);
>  	dra7xx_pcie_enable_interrupts(dra7xx);
> +
> +	return 0;
>  }
>  
>  static const struct dw_pcie_host_ops dra7xx_pcie_host_ops = {
> diff --git a/drivers/pci/dwc/pci-exynos.c b/drivers/pci/dwc/pci-exynos.c
> index c78c06552590..f77f872e8b78 100644
> --- a/drivers/pci/dwc/pci-exynos.c
> +++ b/drivers/pci/dwc/pci-exynos.c
> @@ -581,13 +581,15 @@ static int exynos_pcie_link_up(struct dw_pcie *pci)
>  	return 0;
>  }
>  
> -static void exynos_pcie_host_init(struct pcie_port *pp)
> +static int exynos_pcie_host_init(struct pcie_port *pp)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  	struct exynos_pcie *ep = to_exynos_pcie(pci);
>  
>  	exynos_pcie_establish_link(ep);
>  	exynos_pcie_enable_interrupts(ep);
> +
> +	return 0;
>  }
>  
>  static const struct dw_pcie_host_ops exynos_pcie_host_ops = {
> diff --git a/drivers/pci/dwc/pci-imx6.c b/drivers/pci/dwc/pci-imx6.c
> index bf5c3616e344..20aae4469ee4 100644
> --- a/drivers/pci/dwc/pci-imx6.c
> +++ b/drivers/pci/dwc/pci-imx6.c
> @@ -636,7 +636,7 @@ static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie)
>  	return ret;
>  }
>  
> -static void imx6_pcie_host_init(struct pcie_port *pp)
> +static int imx6_pcie_host_init(struct pcie_port *pp)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
> @@ -649,6 +649,8 @@ static void imx6_pcie_host_init(struct pcie_port *pp)
>  
>  	if (IS_ENABLED(CONFIG_PCI_MSI))
>  		dw_pcie_msi_init(pp);
> +
> +	return 0;
>  }
>  
>  static int imx6_pcie_link_up(struct dw_pcie *pci)
> diff --git a/drivers/pci/dwc/pci-keystone.c b/drivers/pci/dwc/pci-keystone.c
> index 4783cec1f78d..3ad3f8aa27b0 100644
> --- a/drivers/pci/dwc/pci-keystone.c
> +++ b/drivers/pci/dwc/pci-keystone.c
> @@ -261,7 +261,7 @@ static int keystone_pcie_fault(unsigned long addr, unsigned int fsr,
>  	return 0;
>  }
>  
> -static void __init ks_pcie_host_init(struct pcie_port *pp)
> +static int __init ks_pcie_host_init(struct pcie_port *pp)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
> @@ -289,6 +289,8 @@ static void __init ks_pcie_host_init(struct pcie_port *pp)
>  	 */
>  	hook_fault_code(17, keystone_pcie_fault, SIGBUS, 0,
>  			"Asynchronous external abort");
> +
> +	return 0;
>  }
>  
>  static const struct dw_pcie_host_ops keystone_pcie_host_ops = {
> diff --git a/drivers/pci/dwc/pci-layerscape.c b/drivers/pci/dwc/pci-layerscape.c
> index fd861289ad8b..7581490f007c 100644
> --- a/drivers/pci/dwc/pci-layerscape.c
> +++ b/drivers/pci/dwc/pci-layerscape.c
> @@ -108,31 +108,35 @@ static int ls1021_pcie_link_up(struct dw_pcie *pci)
>  	return 1;
>  }
>  
> -static void ls1021_pcie_host_init(struct pcie_port *pp)
> +static int ls1021_pcie_host_init(struct pcie_port *pp)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  	struct ls_pcie *pcie = to_ls_pcie(pci);
>  	struct device *dev = pci->dev;
>  	u32 index[2];
> +	int ret;
>  
>  	pcie->scfg = syscon_regmap_lookup_by_phandle(dev->of_node,
>  						     "fsl,pcie-scfg");
>  	if (IS_ERR(pcie->scfg)) {
> +		ret = PTR_ERR(pcie->scfg);
>  		dev_err(dev, "No syscfg phandle specified\n");
>  		pcie->scfg = NULL;
> -		return;
> +		return ret;
>  	}
>  
>  	if (of_property_read_u32_array(dev->of_node,
>  				       "fsl,pcie-scfg", index, 2)) {
>  		pcie->scfg = NULL;
> -		return;
> +		return -EINVAL;
>  	}
>  	pcie->index = index[1];
>  
>  	dw_pcie_setup_rc(pp);
>  
>  	ls_pcie_drop_msg_tlp(pcie);
> +
> +	return 0;
>  }
>  
>  static int ls_pcie_link_up(struct dw_pcie *pci)
> @@ -150,7 +154,7 @@ static int ls_pcie_link_up(struct dw_pcie *pci)
>  	return 1;
>  }
>  
> -static void ls_pcie_host_init(struct pcie_port *pp)
> +static int ls_pcie_host_init(struct pcie_port *pp)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  	struct ls_pcie *pcie = to_ls_pcie(pci);
> @@ -160,6 +164,8 @@ static void ls_pcie_host_init(struct pcie_port *pp)
>  	ls_pcie_clear_multifunction(pcie);
>  	ls_pcie_drop_msg_tlp(pcie);
>  	iowrite32(0, pci->dbi_base + PCIE_DBI_RO_WR_EN);
> +
> +	return 0;
>  }
>  
>  static int ls_pcie_msi_host_init(struct pcie_port *pp,
> diff --git a/drivers/pci/dwc/pcie-armada8k.c b/drivers/pci/dwc/pcie-armada8k.c
> index ea8f34af6a85..017a727a68db 100644
> --- a/drivers/pci/dwc/pcie-armada8k.c
> +++ b/drivers/pci/dwc/pcie-armada8k.c
> @@ -134,13 +134,15 @@ static void armada8k_pcie_establish_link(struct armada8k_pcie *pcie)
>  		dev_err(pci->dev, "Link not up after reconfiguration\n");
>  }
>  
> -static void armada8k_pcie_host_init(struct pcie_port *pp)
> +static int armada8k_pcie_host_init(struct pcie_port *pp)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  	struct armada8k_pcie *pcie = to_armada8k_pcie(pci);
>  
>  	dw_pcie_setup_rc(pp);
>  	armada8k_pcie_establish_link(pcie);
> +
> +	return 0;
>  }
>  
>  static irqreturn_t armada8k_pcie_irq_handler(int irq, void *arg)
> diff --git a/drivers/pci/dwc/pcie-artpec6.c b/drivers/pci/dwc/pcie-artpec6.c
> index 01c6f7823672..5d81f1d884e3 100644
> --- a/drivers/pci/dwc/pcie-artpec6.c
> +++ b/drivers/pci/dwc/pcie-artpec6.c
> @@ -175,13 +175,15 @@ static void artpec6_pcie_enable_interrupts(struct artpec6_pcie *artpec6_pcie)
>  		dw_pcie_msi_init(pp);
>  }
>  
> -static void artpec6_pcie_host_init(struct pcie_port *pp)
> +static int artpec6_pcie_host_init(struct pcie_port *pp)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  	struct artpec6_pcie *artpec6_pcie = to_artpec6_pcie(pci);
>  
>  	artpec6_pcie_establish_link(artpec6_pcie);
>  	artpec6_pcie_enable_interrupts(artpec6_pcie);
> +
> +	return 0;
>  }
>  
>  static const struct dw_pcie_host_ops artpec6_pcie_host_ops = {
> diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c
> index d29c020da082..157621175147 100644
> --- a/drivers/pci/dwc/pcie-designware-host.c
> +++ b/drivers/pci/dwc/pcie-designware-host.c
> @@ -401,8 +401,11 @@ int dw_pcie_host_init(struct pcie_port *pp)
>  		}
>  	}
>  
> -	if (pp->ops->host_init)
> -		pp->ops->host_init(pp);
> +	if (pp->ops->host_init) {
> +		ret = pp->ops->host_init(pp);
> +		if (ret)
> +			goto error;
> +	}
>  
>  	pp->root_bus_nr = pp->busn->start;
>  
> diff --git a/drivers/pci/dwc/pcie-designware-plat.c b/drivers/pci/dwc/pcie-designware-plat.c
> index 091b4e7ad059..168e2380f493 100644
> --- a/drivers/pci/dwc/pcie-designware-plat.c
> +++ b/drivers/pci/dwc/pcie-designware-plat.c
> @@ -35,7 +35,7 @@ static irqreturn_t dw_plat_pcie_msi_irq_handler(int irq, void *arg)
>  	return dw_handle_msi_irq(pp);
>  }
>  
> -static void dw_plat_pcie_host_init(struct pcie_port *pp)
> +static int dw_plat_pcie_host_init(struct pcie_port *pp)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  
> @@ -44,6 +44,8 @@ static void dw_plat_pcie_host_init(struct pcie_port *pp)
>  
>  	if (IS_ENABLED(CONFIG_PCI_MSI))
>  		dw_pcie_msi_init(pp);
> +
> +	return 0;
>  }
>  
>  static const struct dw_pcie_host_ops dw_plat_pcie_host_ops = {
> diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h
> index b4d2a89f8e58..7366c8167404 100644
> --- a/drivers/pci/dwc/pcie-designware.h
> +++ b/drivers/pci/dwc/pcie-designware.h
> @@ -134,7 +134,7 @@ struct dw_pcie_host_ops {
>  			     unsigned int devfn, int where, int size, u32 *val);
>  	int (*wr_other_conf)(struct pcie_port *pp, struct pci_bus *bus,
>  			     unsigned int devfn, int where, int size, u32 val);
> -	void (*host_init)(struct pcie_port *pp);
> +	int (*host_init)(struct pcie_port *pp);
>  	void (*msi_set_irq)(struct pcie_port *pp, int irq);
>  	void (*msi_clear_irq)(struct pcie_port *pp, int irq);
>  	phys_addr_t (*get_msi_addr)(struct pcie_port *pp);
> diff --git a/drivers/pci/dwc/pcie-kirin.c b/drivers/pci/dwc/pcie-kirin.c
> index 33fddb9f6739..0b0eb67f2658 100644
> --- a/drivers/pci/dwc/pcie-kirin.c
> +++ b/drivers/pci/dwc/pcie-kirin.c
> @@ -430,9 +430,11 @@ static int kirin_pcie_establish_link(struct pcie_port *pp)
>  	return 0;
>  }
>  
> -static void kirin_pcie_host_init(struct pcie_port *pp)
> +static int kirin_pcie_host_init(struct pcie_port *pp)
>  {
>  	kirin_pcie_establish_link(pp);
> +
> +	return 0;
>  }
>  
>  static struct dw_pcie_ops kirin_dw_pcie_ops = {
> diff --git a/drivers/pci/dwc/pcie-qcom.c b/drivers/pci/dwc/pcie-qcom.c
> index 68c5f2ab5bc8..d15657dc3990 100644
> --- a/drivers/pci/dwc/pcie-qcom.c
> +++ b/drivers/pci/dwc/pcie-qcom.c
> @@ -891,7 +891,7 @@ static int qcom_pcie_link_up(struct dw_pcie *pci)
>  	return !!(val & PCI_EXP_LNKSTA_DLLLA);
>  }
>  
> -static void qcom_pcie_host_init(struct pcie_port *pp)
> +static int qcom_pcie_host_init(struct pcie_port *pp)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  	struct qcom_pcie *pcie = to_qcom_pcie(pci);
> @@ -921,12 +921,14 @@ static void qcom_pcie_host_init(struct pcie_port *pp)
>  	if (ret)
>  		goto err;
>  
> -	return;
> +	return 0;
>  err:
>  	qcom_ep_reset_assert(pcie);
>  	phy_power_off(pcie->phy);
>  err_deinit:
>  	pcie->ops->deinit(pcie);
> +
> +	return ret;
>  }
>  
>  static int qcom_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
> diff --git a/drivers/pci/dwc/pcie-spear13xx.c b/drivers/pci/dwc/pcie-spear13xx.c
> index 80897291e0fb..52000bc34600 100644
> --- a/drivers/pci/dwc/pcie-spear13xx.c
> +++ b/drivers/pci/dwc/pcie-spear13xx.c
> @@ -177,13 +177,15 @@ static int spear13xx_pcie_link_up(struct dw_pcie *pci)
>  	return 0;
>  }
>  
> -static void spear13xx_pcie_host_init(struct pcie_port *pp)
> +static int spear13xx_pcie_host_init(struct pcie_port *pp)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  	struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pci);
>  
>  	spear13xx_pcie_establish_link(spear13xx_pcie);
>  	spear13xx_pcie_enable_interrupts(spear13xx_pcie);
> +
> +	return 0;
>  }
>  
>  static const struct dw_pcie_host_ops spear13xx_pcie_host_ops = {
> -- 
> 2.12.0
> 
> 
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