Re: [PATCH 1/3] PCI: dwc: Handle host_init failures

From: Bjorn Helgaas
Date: Thu Aug 03 2017 - 17:19:34 EST

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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@xxxxxxxxxx>

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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