misc: pci_endpoint_test: Remove global 'irq_type' and 'no_msi'

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".

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@kernel.org>
Suggested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
[kwilczynski: commit log]
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20250225110252.28866-6-hayashi.kunihiko@socionext.com

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;