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

From: Bjorn Andersson
Date: Sun Jul 16 2017 - 02:40:33 EST

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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>
---
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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