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SubjectRe: [PATCH 1/3] PCI: dwc: Handle host_init failures
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Hi Bjorn Andersson,

Às 7:39 AM de 7/16/2017, Bjorn Andersson escreveu:
> 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@linaro.org>
> ---
> 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 = {
>

A step in the right direction :). In the future we should add host init
validation in the specific SoC drivers, like Layerscape and Qcom have, to assure
that any problem is treated properly in the core driver.

Acked-by: Joao Pinto <jpinto@synopsys.com>

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