linux-kernel - Re: [PATCH v9 14/20] PCI: microchip: Add get

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Message-ID: <09f8a530-1bd0-4dc3-85a2-8d67fdcd0148@starfivetech.com>
Date:   Thu, 26 Oct 2023 10:22:34 +0800
From:   Minda Chen <minda.chen@...rfivetech.com>
To:     Conor Dooley <conor@...nel.org>
CC:     Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh+dt@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Daire McNamara <daire.mcnamara@...rochip.com>,
        "Emil Renner Berthing" <emil.renner.berthing@...onical.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <linux-pci@...r.kernel.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 v9 14/20] PCI: microchip: Add get_events() callback
 function



On 2023/10/25 18:44, Conor Dooley wrote:
> Hey,
> 
> On Fri, Oct 20, 2023 at 06:43:35PM +0800, Minda Chen wrote:
>> PolarFire implements their own PCIe interrupts,
>> which added to global PCIe field for PLDA lack of
>> MSI controller, the interrupts to event num mapping
>> is different to PLDA local interrupts. So add
>> get_events() function pointer.
> 
> Just FYI, it's not the PLDA IP's lack of an MSI controller, it's the SoC
> itself that doesn't have one. Last time I spoke to Daire about this, he
> was surprised that you didn't need something similar. I might reword
> this as
> 
> "PolarFire SoC implements its own PCIe interrupts, additional to the
> regular PCIe interrupts, due to the lack of an MSI controller, so the
> interrupt to event number mapping is different to the PLDA local
> interrupts, necessitating a custom get_events() implementation."
> 
>> Also add struct plda_event_ops function pointer structure
>> to struct plda_pcie_rp.
> 
> I'd probably also drop this, as it is evident from the diff.
> 
> Cheers,
> Conor.
> 
OK. Thanks very much.
>> plda_handle_events() will call the get_events() callback
>> function pointer directly. For the robustness of codes,
>> add checking in plda_init_interrupts().
>> 
>> Signed-off-by: Minda Chen <minda.chen@...rfivetech.com>
>> Acked-by: Conor Dooley <conor.dooley@...rochip.com>
>> ---
>>  drivers/pci/controller/plda/pcie-microchip-host.c | 14 +++++++++++++-
>>  drivers/pci/controller/plda/pcie-plda.h           |  8 ++++++++
>>  2 files changed, 21 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c b/drivers/pci/controller/plda/pcie-microchip-host.c
>> index e57827bdb4b3..5a8c134bf643 100644
>> --- a/drivers/pci/controller/plda/pcie-microchip-host.c
>> +++ b/drivers/pci/controller/plda/pcie-microchip-host.c
>> @@ -652,7 +652,7 @@ static void plda_handle_event(struct irq_desc *desc)
>>  
>>  	chained_irq_enter(chip, desc);
>>  
>> -	events = mc_get_events(port);
>> +	events = port->event_ops->get_events(port);
>>  
>>  	for_each_set_bit(bit, &events, port->num_events)
>>  		generic_handle_domain_irq(port->event_domain, bit);
>> @@ -811,7 +811,12 @@ static int mc_request_event_irq(struct plda_pcie_rp *plda, int event_irq,
>>  				0, event_cause[event].sym, plda);
>>  }
>>  
>> +static const struct plda_event_ops mc_event_ops = {
>> +	.get_events = mc_get_events,
>> +};
>> +
>>  static const struct plda_event mc_event = {
>> +	.event_ops         = &mc_event_ops,
>>  	.request_event_irq = mc_request_event_irq,
>>  	.intx_event        = EVENT_LOCAL_PM_MSI_INT_INTX,
>>  	.msi_event         = EVENT_LOCAL_PM_MSI_INT_MSI,
>> @@ -925,6 +930,11 @@ static int plda_init_interrupts(struct platform_device *pdev,
>>  	int i, intx_irq, msi_irq, event_irq;
>>  	int ret;
>>  
>> +	if (!event->event_ops || !event->event_ops->get_events) {
>> +		dev_err(dev, "no get events ops\n");
>> +		return -EINVAL;
>> +	}
>> +
>>  	ret = plda_pcie_init_irq_domains(port);
>>  	if (ret) {
>>  		dev_err(dev, "failed creating IRQ domains\n");
>> @@ -935,6 +945,8 @@ static int plda_init_interrupts(struct platform_device *pdev,
>>  	if (irq < 0)
>>  		return -ENODEV;
>>  
>> +	port->event_ops = event->event_ops;
>> +
>>  	for (i = 0; i < port->num_events; i++) {
>>  		event_irq = irq_create_mapping(port->event_domain, i);
>>  		if (!event_irq) {
>> diff --git a/drivers/pci/controller/plda/pcie-plda.h b/drivers/pci/controller/plda/pcie-plda.h
>> index fba7343f9a96..df1729095952 100644
>> --- a/drivers/pci/controller/plda/pcie-plda.h
>> +++ b/drivers/pci/controller/plda/pcie-plda.h
>> @@ -102,6 +102,12 @@
>>  #define EVENT_PM_MSI_INT_SYS_ERR		12
>>  #define NUM_PLDA_EVENTS				13
>>  
>> +struct plda_pcie_rp;
>> +
>> +struct plda_event_ops {
>> +	u32 (*get_events)(struct plda_pcie_rp *pcie);
>> +};
>> +
>>  struct plda_msi {
>>  	struct mutex lock;		/* Protect used bitmap */
>>  	struct irq_domain *msi_domain;
>> @@ -117,11 +123,13 @@ struct plda_pcie_rp {
>>  	struct irq_domain *event_domain;
>>  	raw_spinlock_t lock;
>>  	struct plda_msi msi;
>> +	const struct plda_event_ops *event_ops;
>>  	void __iomem *bridge_addr;
>>  	int num_events;
>>  };
>>  
>>  struct plda_event {
>> +	const struct plda_event_ops *event_ops;
>>  	int (*request_event_irq)(struct plda_pcie_rp *pcie,
>>  				 int event_irq, int event);
>>  	int intx_event;
>> -- 
>> 2.17.1
>>