linux-kernel - Re: [PATCH v4 5/6] misc: pci_endpoint_test: Remove global 'irq_type' and 'no

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Message-ID: <20250313170058.ncixyafsse5ry7xh@thinkpad>
Date: Thu, 13 Mar 2025 22:30:58 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
Cc: Krzysztof Wilczynski <kw@...ux.com>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>, Shuah Khan <shuah@...nel.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org, Niklas Cassel <cassel@...nel.org>
Subject: Re: [PATCH v4 5/6] misc: pci_endpoint_test: Remove global 'irq_type'
 and 'no_msi'

On Tue, Feb 25, 2025 at 08:02:51PM +0900, Kunihiko Hayashi wrote:
> The global variable "irq_type" preserves the current value of
> ioctl(GET_IRQTYPE).
> 
> However, all tests that use interrupts first call ioctl(SET_IRQTYPE)
> to set test->irq_type, then write the value of test->irq_type into the
> register pointed by test_reg_bar, and request the interrupt to the
> endpoint. The endpoint function driver, pci-epf-test, refers to the
> register, and determine which type of interrupt to raise.
> 
> The global variable "irq_type" is never used in the actual test,
> so remove the variable and replace it with test->irq_type.
> 
> And also for the same reason, the variable "no_msi" can be removed.
> 
> Initially, test->irq_type has IRQ_TYPE_UNDEFINED, and the
> ioctl(GET_IRQTYPE) before calling ioctl(SET_IRQTYPE) will return an error.
> 
> Suggested-by: Niklas Cassel <cassel@...nel.org>
> Suggested-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

- Mani

> ---
>  drivers/misc/pci_endpoint_test.c | 18 +++---------------
>  1 file changed, 3 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
> index 896392c428de..326e8e467c42 100644
> --- a/drivers/misc/pci_endpoint_test.c
> +++ b/drivers/misc/pci_endpoint_test.c
> @@ -96,14 +96,6 @@ static DEFINE_IDA(pci_endpoint_test_ida);
>  #define to_endpoint_test(priv) container_of((priv), struct pci_endpoint_test, \
>  					    miscdev)
>  
> -static bool no_msi;
> -module_param(no_msi, bool, 0444);
> -MODULE_PARM_DESC(no_msi, "Disable MSI interrupt in pci_endpoint_test");
> -
> -static int irq_type = IRQ_TYPE_MSI;
> -module_param(irq_type, int, 0444);
> -MODULE_PARM_DESC(irq_type, "IRQ mode selection in pci_endpoint_test (0 - Legacy, 1 - MSI, 2 - MSI-X)");
> -
>  enum pci_barno {
>  	BAR_0,
>  	BAR_1,
> @@ -833,7 +825,6 @@ static int pci_endpoint_test_set_irq(struct pci_endpoint_test *test,
>  		return ret;
>  	}
>  
> -	irq_type = test->irq_type;
>  	return 0;
>  }
>  
> @@ -882,7 +873,7 @@ static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,
>  		ret = pci_endpoint_test_set_irq(test, arg);
>  		break;
>  	case PCITEST_GET_IRQTYPE:
> -		ret = irq_type;
> +		ret = test->irq_type;
>  		break;
>  	case PCITEST_CLEAR_IRQ:
>  		ret = pci_endpoint_test_clear_irq(test);
> @@ -939,15 +930,12 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
>  	test->pdev = pdev;
>  	test->irq_type = IRQ_TYPE_UNDEFINED;
>  
> -	if (no_msi)
> -		irq_type = IRQ_TYPE_INTX;
> -
>  	data = (struct pci_endpoint_test_data *)ent->driver_data;
>  	if (data) {
>  		test_reg_bar = data->test_reg_bar;
>  		test->test_reg_bar = test_reg_bar;
>  		test->alignment = data->alignment;
> -		irq_type = data->irq_type;
> +		test->irq_type = data->irq_type;
>  	}
>  
>  	init_completion(&test->irq_raised);
> @@ -969,7 +957,7 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
>  
>  	pci_set_master(pdev);
>  
> -	ret = pci_endpoint_test_alloc_irq_vectors(test, irq_type);
> +	ret = pci_endpoint_test_alloc_irq_vectors(test, test->irq_type);
>  	if (ret)
>  		goto err_disable_irq;
>  
> -- 
> 2.25.1
> 

-- 
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