| Message ID | 1390903616-8073-3-git-send-email-ben.dooks@codethink.co.uk (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On 01/28/2014 02:06 PM, Ben Dooks wrote: > Add option to enable interrupts to report any errors from > the AHB-PCI bridge to help find any issues with the bridge > when in use. > > Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> > --- > Cc: Valentine Barshak <valentine.barshak@cogentembedded.com> > Cc: Simon Horman <horms@verge.net.au> > Cc: Bjorn Helgaas <bhelgaas@google.com> > Cc: linux-pci@vger.kernel.org > Cc: linux-sh@vger.kernel.org > --- > drivers/pci/host/Kconfig | 9 ++++++ > drivers/pci/host/pci-rcar-gen2.c | 60 ++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 69 insertions(+) > > diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig > index 47d46c6..6d4c46e 100644 > --- a/drivers/pci/host/Kconfig > +++ b/drivers/pci/host/Kconfig > @@ -33,4 +33,13 @@ config PCI_RCAR_GEN2 > There are 3 internal PCI controllers available with a single > built-in EHCI/OHCI host controller present on each one. > > +config PCI_RCAR_GEN2_ERRIRQ I don't think we need to introduce another option. Please, see my comments below. > + bool "Enable error reporting interrupt support" > + depends on PCI_RCAR_GEN2 > + help > + Say Y here to enable support for the bus-error interrupts from > + the PCI controller bridge. > + > + This is here for aiding in debugging issues with the hardware. > + > endmenu > diff --git a/drivers/pci/host/pci-rcar-gen2.c b/drivers/pci/host/pci-rcar-gen2.c > index 674f7fe..01ba069 100644 > --- a/drivers/pci/host/pci-rcar-gen2.c > +++ b/drivers/pci/host/pci-rcar-gen2.c > @@ -39,9 +39,26 @@ > > #define RCAR_PCI_INT_ENABLE_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x20) > #define RCAR_PCI_INT_STATUS_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x24) > +#define RCAR_PCI_INT_SIGTABORT (1 << 0) > +#define RCAR_PCI_INT_SIGRETABORT (1 << 1) > +#define RCAR_PCI_INT_REMABORT (1 << 2) > +#define RCAR_PCI_INT_PERR (1 << 3) > +#define RCAR_PCI_INT_SIGSERR (1 << 4) > +#define RCAR_PCI_INT_RESERR (1 << 5) > +#define RCAR_PCI_INT_WIN1ERR (1 << 12) > +#define RCAR_PCI_INT_WIN2ERR (1 << 13) > #define RCAR_PCI_INT_A (1 << 16) > #define RCAR_PCI_INT_B (1 << 17) > #define RCAR_PCI_INT_PME (1 << 19) > +#define RCAR_PCI_INT_ALLERRORS (RCAR_PCI_INT_SIGTABORT | \ > + RCAR_PCI_INT_SIGRETABORT | \ > + RCAR_PCI_INT_SIGRETABORT | \ > + RCAR_PCI_INT_REMABORT | \ > + RCAR_PCI_INT_PERR | \ > + RCAR_PCI_INT_SIGSERR | \ > + RCAR_PCI_INT_RESERR | \ > + RCAR_PCI_INT_WIN1ERR | \ > + RCAR_PCI_INT_WIN2ERR) If you don't mind me nitpicking, please, follow the style of #define RCAR_AHB_BUS_MODE > > #define RCAR_AHB_BUS_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x30) > #define RCAR_AHB_BUS_MMODE_HTRANS (1 << 0) > @@ -164,6 +181,47 @@ static int __init rcar_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) > return priv->irq; > } > > +#ifdef CONFIG_PCI_RCAR_GEN2_ERRIRQ I think we could get away with #if IS_ENABLED(CONFIG_PCI_DEBUG) instead of introducing another option here. > +static irqreturn_t rcar_pci_err_irq(int irq, void *pw) > +{ > + struct rcar_pci_priv *priv = pw; > + u32 status = ioread32(priv->reg + RCAR_PCI_INT_STATUS_REG); I'd do "& RCAR_PCI_INT_ALLERRORS" here once instead of doing "status & RCAR_PCI_INT_ALLERRORS" twice below. > + > + if (status & RCAR_PCI_INT_ALLERRORS) { > + dev_err(priv->dev, "error irq: status %08x\n", status); Some errors are not critical. For example, master abort may happen during probing. You may want to use dev_dbg since this is all about debugging > + > + /* clear the error(s) */ > + iowrite32(status & RCAR_PCI_INT_ALLERRORS, > + priv->reg + RCAR_PCI_INT_STATUS_REG); > + return IRQ_HANDLED; > + } > + > + return IRQ_NONE; > +} > + > +static void rcar_pci_setup_errirq(struct rcar_pci_priv *priv) > +{ > + int ret; > + u32 val; > + > + ret = devm_request_irq(priv->dev, priv->irq, rcar_pci_err_irq, > + IRQF_SHARED, "error irq", priv); > + if (ret) { > + dev_err(priv->dev, "cannot claim IRQ for error handling\n"); > + return; > + } > + > + val = ioread32(priv->reg + RCAR_PCI_INT_ENABLE_REG); > + val |= RCAR_PCI_INT_ALLERRORS; > + iowrite32(val, priv->reg + RCAR_PCI_INT_ENABLE_REG); > + > + dev_info(priv->dev, "irq mask now %08x\n", val); > +} > +#else > +static inline void rcar_pci_setup_errirq(struct rcar_pci_priv *priv) { } > + > +#endif > + > /* PCI host controller setup */ > static int __init rcar_pci_setup(int nr, struct pci_sys_data *sys) > { > @@ -224,6 +282,8 @@ static int __init rcar_pci_setup(int nr, struct pci_sys_data *sys) > iowrite32(RCAR_PCI_INT_A | RCAR_PCI_INT_B | RCAR_PCI_INT_PME, > reg + RCAR_PCI_INT_ENABLE_REG); > > + rcar_pci_setup_errirq(priv); > + Since priv->irq == 0 is valid and means no interrupt, you may want to call rcar_pci_setup_errirq only if (irq > 0) Besides, I'd probably setup the IRQ handler directly before enabling the interrupts -- under #if IS_ENABLED(CONFIG_PCI_DEBUG) if you like -- instead of introducing the rcar_pci_setup_errirq function and reading/modifying/writing the RCAR_PCI_INT_ENABLE_REG there. > /* Add PCI resources */ > pci_add_resource(&sys->resources, &priv->io_res); > pci_add_resource(&sys->resources, &priv->mem_res); > Thanks, Val. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig index 47d46c6..6d4c46e 100644 --- a/drivers/pci/host/Kconfig +++ b/drivers/pci/host/Kconfig @@ -33,4 +33,13 @@ config PCI_RCAR_GEN2 There are 3 internal PCI controllers available with a single built-in EHCI/OHCI host controller present on each one. +config PCI_RCAR_GEN2_ERRIRQ + bool "Enable error reporting interrupt support" + depends on PCI_RCAR_GEN2 + help + Say Y here to enable support for the bus-error interrupts from + the PCI controller bridge. + + This is here for aiding in debugging issues with the hardware. + endmenu diff --git a/drivers/pci/host/pci-rcar-gen2.c b/drivers/pci/host/pci-rcar-gen2.c index 674f7fe..01ba069 100644 --- a/drivers/pci/host/pci-rcar-gen2.c +++ b/drivers/pci/host/pci-rcar-gen2.c @@ -39,9 +39,26 @@ #define RCAR_PCI_INT_ENABLE_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x20) #define RCAR_PCI_INT_STATUS_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x24) +#define RCAR_PCI_INT_SIGTABORT (1 << 0) +#define RCAR_PCI_INT_SIGRETABORT (1 << 1) +#define RCAR_PCI_INT_REMABORT (1 << 2) +#define RCAR_PCI_INT_PERR (1 << 3) +#define RCAR_PCI_INT_SIGSERR (1 << 4) +#define RCAR_PCI_INT_RESERR (1 << 5) +#define RCAR_PCI_INT_WIN1ERR (1 << 12) +#define RCAR_PCI_INT_WIN2ERR (1 << 13) #define RCAR_PCI_INT_A (1 << 16) #define RCAR_PCI_INT_B (1 << 17) #define RCAR_PCI_INT_PME (1 << 19) +#define RCAR_PCI_INT_ALLERRORS (RCAR_PCI_INT_SIGTABORT | \ + RCAR_PCI_INT_SIGRETABORT | \ + RCAR_PCI_INT_SIGRETABORT | \ + RCAR_PCI_INT_REMABORT | \ + RCAR_PCI_INT_PERR | \ + RCAR_PCI_INT_SIGSERR | \ + RCAR_PCI_INT_RESERR | \ + RCAR_PCI_INT_WIN1ERR | \ + RCAR_PCI_INT_WIN2ERR) #define RCAR_AHB_BUS_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x30) #define RCAR_AHB_BUS_MMODE_HTRANS (1 << 0) @@ -164,6 +181,47 @@ static int __init rcar_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) return priv->irq; } +#ifdef CONFIG_PCI_RCAR_GEN2_ERRIRQ +static irqreturn_t rcar_pci_err_irq(int irq, void *pw) +{ + struct rcar_pci_priv *priv = pw; + u32 status = ioread32(priv->reg + RCAR_PCI_INT_STATUS_REG); + + if (status & RCAR_PCI_INT_ALLERRORS) { + dev_err(priv->dev, "error irq: status %08x\n", status); + + /* clear the error(s) */ + iowrite32(status & RCAR_PCI_INT_ALLERRORS, + priv->reg + RCAR_PCI_INT_STATUS_REG); + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static void rcar_pci_setup_errirq(struct rcar_pci_priv *priv) +{ + int ret; + u32 val; + + ret = devm_request_irq(priv->dev, priv->irq, rcar_pci_err_irq, + IRQF_SHARED, "error irq", priv); + if (ret) { + dev_err(priv->dev, "cannot claim IRQ for error handling\n"); + return; + } + + val = ioread32(priv->reg + RCAR_PCI_INT_ENABLE_REG); + val |= RCAR_PCI_INT_ALLERRORS; + iowrite32(val, priv->reg + RCAR_PCI_INT_ENABLE_REG); + + dev_info(priv->dev, "irq mask now %08x\n", val); +} +#else +static inline void rcar_pci_setup_errirq(struct rcar_pci_priv *priv) { } + +#endif + /* PCI host controller setup */ static int __init rcar_pci_setup(int nr, struct pci_sys_data *sys) { @@ -224,6 +282,8 @@ static int __init rcar_pci_setup(int nr, struct pci_sys_data *sys) iowrite32(RCAR_PCI_INT_A | RCAR_PCI_INT_B | RCAR_PCI_INT_PME, reg + RCAR_PCI_INT_ENABLE_REG); + rcar_pci_setup_errirq(priv); + /* Add PCI resources */ pci_add_resource(&sys->resources, &priv->io_res); pci_add_resource(&sys->resources, &priv->mem_res);
Add option to enable interrupts to report any errors from the AHB-PCI bridge to help find any issues with the bridge when in use. Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> --- Cc: Valentine Barshak <valentine.barshak@cogentembedded.com> Cc: Simon Horman <horms@verge.net.au> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: linux-pci@vger.kernel.org Cc: linux-sh@vger.kernel.org --- drivers/pci/host/Kconfig | 9 ++++++ drivers/pci/host/pci-rcar-gen2.c | 60 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 69 insertions(+)