linux-kernel - Re: [PATCH v13 11/21] PCI: microchip: Add num_events field to struct plda_pcie

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Date: Wed, 27 Dec 2023 16:55:56 +0100
From: Lorenzo Pieralisi <lpieralisi@...nel.org>
To: Minda Chen <minda.chen@...rfivetech.com>
Cc: Conor Dooley <conor@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh+dt@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	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 v13 11/21] PCI: microchip: Add num_events field to struct
 plda_pcie_rp

On Thu, Dec 14, 2023 at 03:28:29PM +0800, Minda Chen wrote:
> The event num is different in other platform. For re-using interrupt
> process codes, replace macros with variable.

"The number of events is different across platforms. In order to
share interrupt processing code, add a variable that defines the
number of events so that it can be set per-platform instead of
hardcoding it".

Lorenzo

> 
> Signed-off-by: Minda Chen <minda.chen@...rfivetech.com>
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
>  drivers/pci/controller/plda/pcie-microchip-host.c | 8 +++++---
>  drivers/pci/controller/plda/pcie-plda.h           | 1 +
>  2 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c b/drivers/pci/controller/plda/pcie-microchip-host.c
> index 506e6eeadc76..7b3f4f74745d 100644
> --- a/drivers/pci/controller/plda/pcie-microchip-host.c
> +++ b/drivers/pci/controller/plda/pcie-microchip-host.c
> @@ -654,7 +654,7 @@ static void plda_handle_event(struct irq_desc *desc)
>  
>  	events = mc_get_events(port);
>  
> -	for_each_set_bit(bit, &events, NUM_EVENTS)
> +	for_each_set_bit(bit, &events, port->num_events)
>  		generic_handle_domain_irq(port->event_domain, bit);
>  
>  	chained_irq_exit(chip, desc);
> @@ -817,7 +817,8 @@ static int plda_pcie_init_irq_domains(struct plda_pcie_rp *port)
>  		return -EINVAL;
>  	}
>  
> -	port->event_domain = irq_domain_add_linear(pcie_intc_node, NUM_EVENTS,
> +	port->event_domain = irq_domain_add_linear(pcie_intc_node,
> +						   port->num_events,
>  						   &plda_event_domain_ops,
>  						   port);
>  	if (!port->event_domain) {
> @@ -921,7 +922,7 @@ static int plda_init_interrupts(struct platform_device *pdev, struct plda_pcie_r
>  	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);
> @@ -1013,6 +1014,7 @@ static int mc_host_probe(struct platform_device *pdev)
>  
>  	bridge_base_addr = port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
>  	plda->bridge_addr = bridge_base_addr;
> +	plda->num_events = NUM_EVENTS;
>  
>  	/* Allow enabling MSI by disabling MSI-X */
>  	val = readl(bridge_base_addr + PCIE_PCI_IRQ_DW0);
> diff --git a/drivers/pci/controller/plda/pcie-plda.h b/drivers/pci/controller/plda/pcie-plda.h
> index 3deefd35fa5a..e3d35cef9894 100644
> --- a/drivers/pci/controller/plda/pcie-plda.h
> +++ b/drivers/pci/controller/plda/pcie-plda.h
> @@ -118,6 +118,7 @@ struct plda_pcie_rp {
>  	raw_spinlock_t lock;
>  	struct plda_msi msi;
>  	void __iomem *bridge_addr;
> +	int num_events;
>  };
>  
>  void plda_pcie_setup_window(void __iomem *bridge_base_addr, u32 index,
> -- 
> 2.17.1
>