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Message-ID: <20230825-undusted-detached-1d67370c0a18@wendy>
Date: Fri, 25 Aug 2023 12:56:03 +0100
From: Conor Dooley <conor.dooley@...rochip.com>
To: Minda Chen <minda.chen@...rfivetech.com>
CC: Daire McNamara <daire.mcnamara@...rochip.com>,
Conor Dooley <conor@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Krzysztof Wilczyński <kw@...ux.com>,
Emil Renner Berthing <emil.renner.berthing@...onical.com>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-riscv@...ts.infradead.org>, <linux-pci@...r.kernel.org>,
Pali Rohár <pali@...nel.org>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Philipp Zabel <p.zabel@...gutronix.de>,
Mason Huo <mason.huo@...rfivetech.com>,
Leyfoon Tan <leyfoon.tan@...rfivetech.com>,
Kevin Xie <kevin.xie@...rfivetech.com>
Subject: Re: [PATCH v4 07/11] PCI: microchip: Rename IRQ init function
Hey Minda,
I would like Daire to take a look at this, but I have a few more
smaller comments on this.
On Fri, Aug 25, 2023 at 05:01:25PM +0800, Minda Chen wrote:
> Rename IRQ init function and prepare for re-use
> IRQ init function.
> Add plda_pcie_ops function pointer data structure,
> PolarFire PCIe uses function pointer to get
> their events num.
>
> rename list:
> mc_init_interrupts() -> plda_init_interrupts()
> mc_pcie_init_irq_domain()-> plda_pcie_init_irq_domains()
>
> Signed-off-by: Minda Chen <minda.chen@...rfivetech.com>
> ---
> .../pci/controller/plda/pcie-microchip-host.c | 49 ++++++++++++++-----
> drivers/pci/controller/plda/pcie-plda.h | 14 ++++++
> 2 files changed, 51 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c b/drivers/pci/controller/plda/pcie-microchip-host.c
> index b1d5b5b3cee5..03e8e93ea7e4 100644
> --- a/drivers/pci/controller/plda/pcie-microchip-host.c
> +++ b/drivers/pci/controller/plda/pcie-microchip-host.c
> @@ -416,7 +416,10 @@ static void mc_handle_event(struct irq_desc *desc)
>
> chained_irq_enter(chip, desc);
>
> - events = get_events(port);
> + if (port->ops && port->ops->get_events)
> + events = port->ops->get_events(port);
> + else
> + events = get_events(port);
I don't really understand why we are going to having two different sorts
of event acquirers here. Is there a reason to not "just" register
get_events() as the default callback & remove the special casing?
>
> for_each_set_bit(bit, &events, NUM_EVENTS)
> generic_handle_domain_irq(port->event_domain, bit);
> @@ -562,11 +565,12 @@ static int mc_pcie_init_clks(struct device *dev)
> return 0;
> }
>
> -static int mc_pcie_init_irq_domains(struct plda_pcie_rp *port)
> +static int plda_pcie_init_irq_domains(struct plda_pcie_rp *port, struct plda_evt *evt)
Could you just spell out the word "event" in all of these data
structures and variables? The existing code seems to always spell it
out, so its a boon for consistency too.
> {
> struct device *dev = port->dev;
> struct device_node *node = dev->of_node;
> struct device_node *pcie_intc_node;
> + const struct irq_domain_ops *ops;
>
> /* Setup INTx */
> pcie_intc_node = of_get_next_child(node, NULL);
> @@ -575,8 +579,9 @@ static int mc_pcie_init_irq_domains(struct plda_pcie_rp *port)
> return -EINVAL;
> }
>
> - port->event_domain = irq_domain_add_linear(pcie_intc_node, NUM_EVENTS,
> - &event_domain_ops, port);
> + ops = evt->domain_ops ? evt->domain_ops : &event_domain_ops;
> + port->event_domain = irq_domain_add_linear(pcie_intc_node, port->num_events,
> + ops, port);
> if (!port->event_domain) {
> dev_err(dev, "failed to get event domain\n");
> of_node_put(pcie_intc_node);
> @@ -661,14 +666,15 @@ static void mc_disable_interrupts(struct mc_pcie *port)
> writel_relaxed(GENMASK(31, 0), bridge_base_addr + ISTATUS_HOST);
> }
>
> -static int mc_init_interrupts(struct platform_device *pdev, struct plda_pcie_rp *port)
> +static int plda_init_interrupts(struct platform_device *pdev,
> + struct plda_pcie_rp *port, struct plda_evt *evt)
> {
> struct device *dev = &pdev->dev;
> int irq;
> int i, intx_irq, msi_irq, event_irq;
> int ret;
>
> - ret = mc_pcie_init_irq_domains(port);
> + ret = plda_pcie_init_irq_domains(port, evt);
> if (ret) {
> dev_err(dev, "failed creating IRQ domains\n");
> return ret;
> @@ -678,15 +684,18 @@ static int mc_init_interrupts(struct platform_device *pdev, struct plda_pcie_rp
> if (irq < 0)
> return -ENODEV;
>
> - for (i = 0; i < NUM_EVENTS; i++) {
> + for (i = 0; i < port->num_events; i++) {
> event_irq = irq_create_mapping(port->event_domain, i);
> if (!event_irq) {
> dev_err(dev, "failed to map hwirq %d\n", i);
> return -ENXIO;
> }
>
> - ret = devm_request_irq(dev, event_irq, mc_event_handler,
> - 0, event_cause[i].sym, port);
> + if (evt->request_evt_irq)
> + ret = evt->request_evt_irq(port, event_irq, i);
> + else
> + ret = devm_request_irq(dev, event_irq, plda_event_handler,
> + 0, NULL, port);
> if (ret) {
> dev_err(dev, "failed to request IRQ %d\n", event_irq);
> return ret;
> @@ -694,7 +703,7 @@ static int mc_init_interrupts(struct platform_device *pdev, struct plda_pcie_rp
> }
>
> intx_irq = irq_create_mapping(port->event_domain,
> - EVENT_LOCAL_PM_MSI_INT_INTX);
> + evt->intx_evt);
> if (!intx_irq) {
> dev_err(dev, "failed to map INTx interrupt\n");
> return -ENXIO;
> @@ -704,7 +713,7 @@ static int mc_init_interrupts(struct platform_device *pdev, struct plda_pcie_rp
> irq_set_chained_handler_and_data(intx_irq, plda_handle_intx, port);
>
> msi_irq = irq_create_mapping(port->event_domain,
> - EVENT_LOCAL_PM_MSI_INT_MSI);
> + evt->msi_evt);
> if (!msi_irq)
> return -ENXIO;
>
> @@ -717,6 +726,17 @@ static int mc_init_interrupts(struct platform_device *pdev, struct plda_pcie_rp
> return 0;
> }
>
> +static int mc_request_evt_irq(struct plda_pcie_rp *plda, int event_irq,
> + int evt)
> +{
> + return devm_request_irq(plda->dev, event_irq, mc_event_handler,
> + 0, event_cause[evt].sym, plda);
> +}
> +
> +static const struct plda_pcie_ops plda_ops = {
> + .get_events = get_events,
> +};
This struct gets left behind in the microchip driver file, but is named
"plda_ops". That doesn't make sense to me, I think it should have an
"mc" prefix like other stuff in the file (and the microchip version of
get_events() should also grow a prefix IMO).
Thanks,
Conor.
> +
> static int mc_platform_init(struct pci_config_window *cfg)
> {
> struct device *dev = cfg->parent;
> @@ -724,6 +744,9 @@ static int mc_platform_init(struct pci_config_window *cfg)
> void __iomem *bridge_base_addr =
> port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
> struct pci_host_bridge *bridge = platform_get_drvdata(pdev);
> + struct plda_evt evt = {&event_domain_ops, mc_request_evt_irq,
> + EVENT_LOCAL_PM_MSI_INT_INTX,
> + EVENT_LOCAL_PM_MSI_INT_MSI};
> int ret;
>
> /* Configure address translation table 0 for PCIe config space */
> @@ -740,7 +763,7 @@ static int mc_platform_init(struct pci_config_window *cfg)
> return ret;
>
> /* Address translation is up; safe to enable interrupts */
> - ret = mc_init_interrupts(pdev, &port->plda);
> + ret = plda_init_interrupts(pdev, &port->plda, &evt);
> if (ret)
> return ret;
>
> @@ -761,6 +784,8 @@ static int mc_host_probe(struct platform_device *pdev)
>
> plda = &port->plda;
> plda->dev = dev;
> + plda->num_events = NUM_EVENTS;
> + plda->ops = &plda_ops;
>
> port->axi_base_addr = devm_platform_ioremap_resource(pdev, 1);
> if (IS_ERR(port->axi_base_addr))
> diff --git a/drivers/pci/controller/plda/pcie-plda.h b/drivers/pci/controller/plda/pcie-plda.h
> index 315d9874b899..ef33c1365b3e 100644
> --- a/drivers/pci/controller/plda/pcie-plda.h
> +++ b/drivers/pci/controller/plda/pcie-plda.h
> @@ -104,6 +104,12 @@
>
> #define PM_MSI_TO_MASK_OFFSET 19
>
> +struct plda_pcie_rp;
> +
> +struct plda_pcie_ops {
> + u32 (*get_events)(struct plda_pcie_rp *pcie);
> +};
> +
> struct plda_msi {
> struct mutex lock; /* Protect used bitmap */
> struct irq_domain *msi_domain;
> @@ -119,10 +125,18 @@ struct plda_pcie_rp {
> struct irq_domain *event_domain;
> raw_spinlock_t lock;
> struct plda_msi msi;
> + const struct plda_pcie_ops *ops;
> void __iomem *bridge_addr;
> int num_events;
> };
>
> +struct plda_evt {
> + const struct irq_domain_ops *domain_ops;
> + int (*request_evt_irq)(struct plda_pcie_rp *pcie, int evt_irq, int event);
> + int intx_evt;
> + int msi_evt;
> +};
> +
> void plda_handle_msi(struct irq_desc *desc);
> int plda_allocate_msi_domains(struct plda_pcie_rp *port);
> irqreturn_t plda_event_handler(int irq, void *dev_id);
> --
> 2.17.1
>
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