| Message ID | 20220523181836.2019180-6-dmitry.baryshkov@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | PCI: qcom: Fix higher MSI vectors handling | expand |
On Mon, May 23, 2022 at 09:18:33PM +0300, Dmitry Baryshkov wrote: > On some of Qualcomm platforms each group of 32 MSI vectors is routed to the > separate GIC interrupt. Implement support for such configurations by > parsing "msi0" ... "msiN" interrupts and attaching them to the chained > handler. > > Note, that if DT doesn't list an array of MSI interrupts and uses single > "msi" IRQ, the driver will limit the amount of supported MSI vectors > accordingly (to 32). > > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > --- > .../pci/controller/dwc/pcie-designware-host.c | 61 +++++++++++++++++-- > 1 file changed, 57 insertions(+), 4 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c > index a076abe6611c..98a57249ecaf 100644 > --- a/drivers/pci/controller/dwc/pcie-designware-host.c > +++ b/drivers/pci/controller/dwc/pcie-designware-host.c > @@ -288,6 +288,47 @@ static void dw_pcie_msi_init(struct pcie_port *pp) > dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_HI, upper_32_bits(msi_target)); > } > > +static const char * const split_msi_names[] = { > + "msi0", "msi1", "msi2", "msi3", > + "msi4", "msi5", "msi6", "msi7", > +}; > + > +static int dw_pcie_parse_split_msi_irq(struct pcie_port *pp) > +{ > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > + struct device *dev = pci->dev; > + struct platform_device *pdev = to_platform_device(dev); > + int irq; > + u32 ctrl, max_vectors; > + > + /* Parse as many IRQs as described in the devicetree. */ > + for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) { > + irq = platform_get_irq_byname_optional(pdev, split_msi_names[ctrl]); I'd do this instead: char *msi_name = "msiX"; msi_name[3] = '0' + ctrl; Otherwise, Reviewed-by: Rob Herring <robh@kernel.org>
On Mon, May 23, 2022 at 09:18:33PM +0300, Dmitry Baryshkov wrote: > On some of Qualcomm platforms each group of 32 MSI vectors is routed to the > separate GIC interrupt. Implement support for such configurations by > parsing "msi0" ... "msiN" interrupts and attaching them to the chained > handler. > > Note, that if DT doesn't list an array of MSI interrupts and uses single > "msi" IRQ, the driver will limit the amount of supported MSI vectors > accordingly (to 32). > > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > --- > .../pci/controller/dwc/pcie-designware-host.c | 61 +++++++++++++++++-- > 1 file changed, 57 insertions(+), 4 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c > index a076abe6611c..98a57249ecaf 100644 > --- a/drivers/pci/controller/dwc/pcie-designware-host.c > +++ b/drivers/pci/controller/dwc/pcie-designware-host.c > @@ -288,6 +288,47 @@ static void dw_pcie_msi_init(struct pcie_port *pp) > dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_HI, upper_32_bits(msi_target)); > } > > +static const char * const split_msi_names[] = { > + "msi0", "msi1", "msi2", "msi3", > + "msi4", "msi5", "msi6", "msi7", > +}; > + > +static int dw_pcie_parse_split_msi_irq(struct pcie_port *pp) > +{ > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > + struct device *dev = pci->dev; > + struct platform_device *pdev = to_platform_device(dev); > + int irq; > + u32 ctrl, max_vectors; > + > + /* Parse as many IRQs as described in the devicetree. */ > + for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) { > + irq = platform_get_irq_byname_optional(pdev, split_msi_names[ctrl]); > + if (irq == -ENXIO) > + break; > + if (irq < 0) > + return dev_err_probe(dev, irq, > + "Failed to parse MSI IRQ '%s'\n", > + split_msi_names[ctrl]); > + > + pp->msi_irq[ctrl] = irq; > + } > + > + /* If there were no "msiN" IRQs at all, fallback to the standard "msi" IRQ. */ > + if (ctrl == 0) > + return -ENXIO; > + > + max_vectors = ctrl * MAX_MSI_IRQS_PER_CTRL; > + if (pp->num_vectors > max_vectors) { > + dev_warn(dev, "Exceeding number of MSI vectors, limiting to %d\n", max_vectors); %u break line after last comma? > + pp->num_vectors = max_vectors; > + } > + if (!pp->num_vectors) > + pp->num_vectors = max_vectors; > + > + return 0; > +} > + > static int dw_pcie_msi_host_init(struct pcie_port *pp) > { > struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > @@ -296,21 +337,32 @@ static int dw_pcie_msi_host_init(struct pcie_port *pp) > int ret; > u32 ctrl, num_ctrls; > > - num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL; > - for (ctrl = 0; ctrl < num_ctrls; ctrl++) > + for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) > pp->irq_mask[ctrl] = ~0; > > + if (!pp->msi_irq[0]) { > + ret = dw_pcie_parse_split_msi_irq(pp); > + if (ret < 0 && ret != -ENXIO) > + return ret; > + } > + > + if (!pp->num_vectors) > + pp->num_vectors = MSI_DEF_NUM_VECTORS; > + num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL; > + > if (!pp->msi_irq[0]) { > int irq = platform_get_irq_byname_optional(pdev, "msi"); > > if (irq < 0) { > irq = platform_get_irq(pdev, 0); > if (irq < 0) > - return irq; > + return dev_err_probe(dev, irq, "Failed to parse MSI irq\n"); > } > pp->msi_irq[0] = irq; > } > > + dev_dbg(dev, "Using %d MSI vectors\n", pp->num_vectors); > + > pp->msi_irq_chip = &dw_pci_msi_bottom_irq_chip; > > ret = dw_pcie_allocate_domains(pp); > @@ -407,7 +459,8 @@ int dw_pcie_host_init(struct pcie_port *pp) > of_property_read_bool(np, "msi-parent") || > of_property_read_bool(np, "msi-map")); > > - if (!pp->num_vectors) { > + /* for the has_msi_ctrl the default assignment is handled inside dw_pcie_msi_host_init() */ Add the missing "case" after "has_msi_ctrl". s/inside/in/ Please make this a multiline comment split at < 80 chars. And follow the comment style of the driver and start with a capital letter. > + if (!pp->has_msi_ctrl && !pp->num_vectors) { > pp->num_vectors = MSI_DEF_NUM_VECTORS; > } else if (pp->num_vectors > MAX_MSI_IRQS) { > dev_err(dev, "Invalid number of vectors\n"); Looks good now otherwise. But please consider Rob's suggestion for generating the interrupt names. Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index a076abe6611c..98a57249ecaf 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -288,6 +288,47 @@ static void dw_pcie_msi_init(struct pcie_port *pp) dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_HI, upper_32_bits(msi_target)); } +static const char * const split_msi_names[] = { + "msi0", "msi1", "msi2", "msi3", + "msi4", "msi5", "msi6", "msi7", +}; + +static int dw_pcie_parse_split_msi_irq(struct pcie_port *pp) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct device *dev = pci->dev; + struct platform_device *pdev = to_platform_device(dev); + int irq; + u32 ctrl, max_vectors; + + /* Parse as many IRQs as described in the devicetree. */ + for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) { + irq = platform_get_irq_byname_optional(pdev, split_msi_names[ctrl]); + if (irq == -ENXIO) + break; + if (irq < 0) + return dev_err_probe(dev, irq, + "Failed to parse MSI IRQ '%s'\n", + split_msi_names[ctrl]); + + pp->msi_irq[ctrl] = irq; + } + + /* If there were no "msiN" IRQs at all, fallback to the standard "msi" IRQ. */ + if (ctrl == 0) + return -ENXIO; + + max_vectors = ctrl * MAX_MSI_IRQS_PER_CTRL; + if (pp->num_vectors > max_vectors) { + dev_warn(dev, "Exceeding number of MSI vectors, limiting to %d\n", max_vectors); + pp->num_vectors = max_vectors; + } + if (!pp->num_vectors) + pp->num_vectors = max_vectors; + + return 0; +} + static int dw_pcie_msi_host_init(struct pcie_port *pp) { struct dw_pcie *pci = to_dw_pcie_from_pp(pp); @@ -296,21 +337,32 @@ static int dw_pcie_msi_host_init(struct pcie_port *pp) int ret; u32 ctrl, num_ctrls; - num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL; - for (ctrl = 0; ctrl < num_ctrls; ctrl++) + for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) pp->irq_mask[ctrl] = ~0; + if (!pp->msi_irq[0]) { + ret = dw_pcie_parse_split_msi_irq(pp); + if (ret < 0 && ret != -ENXIO) + return ret; + } + + if (!pp->num_vectors) + pp->num_vectors = MSI_DEF_NUM_VECTORS; + num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL; + if (!pp->msi_irq[0]) { int irq = platform_get_irq_byname_optional(pdev, "msi"); if (irq < 0) { irq = platform_get_irq(pdev, 0); if (irq < 0) - return irq; + return dev_err_probe(dev, irq, "Failed to parse MSI irq\n"); } pp->msi_irq[0] = irq; } + dev_dbg(dev, "Using %d MSI vectors\n", pp->num_vectors); + pp->msi_irq_chip = &dw_pci_msi_bottom_irq_chip; ret = dw_pcie_allocate_domains(pp); @@ -407,7 +459,8 @@ int dw_pcie_host_init(struct pcie_port *pp) of_property_read_bool(np, "msi-parent") || of_property_read_bool(np, "msi-map")); - if (!pp->num_vectors) { + /* for the has_msi_ctrl the default assignment is handled inside dw_pcie_msi_host_init() */ + if (!pp->has_msi_ctrl && !pp->num_vectors) { pp->num_vectors = MSI_DEF_NUM_VECTORS; } else if (pp->num_vectors > MAX_MSI_IRQS) { dev_err(dev, "Invalid number of vectors\n");
On some of Qualcomm platforms each group of 32 MSI vectors is routed to the separate GIC interrupt. Implement support for such configurations by parsing "msi0" ... "msiN" interrupts and attaching them to the chained handler. Note, that if DT doesn't list an array of MSI interrupts and uses single "msi" IRQ, the driver will limit the amount of supported MSI vectors accordingly (to 32). Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> --- .../pci/controller/dwc/pcie-designware-host.c | 61 +++++++++++++++++-- 1 file changed, 57 insertions(+), 4 deletions(-)