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Message-ID: <c10ee267-67b9-8546-94bd-beccf069f82a@starfivetech.com>
Date: Fri, 1 Sep 2023 11:55:44 +0800
From: Minda Chen <minda.chen@...rfivetech.com>
To: Conor Dooley <conor.dooley@...rochip.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
On 2023/8/25 20:05, Conor Dooley wrote:
> On Fri, Aug 25, 2023 at 12:56:03PM +0100, Conor Dooley wrote:
>> Hey Minda,
>>
>> I would like Daire to take a look at this, but I have a few more
>> smaller comments on this.
>
> And another one that is nitpickery..
>
>>
>> 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?
>>
That's ok. All in get_events() callback
>> >
>> > 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.
>>
ok
>> > {
>> > 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.
>>
OK. thanks.
>> > +
>> > 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};
>
> Isn't this the normal style for struct initialisers?
> 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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