Commit 5bd43cec authored by Juxin Gao's avatar Juxin Gao Committed by Hongchen Zhang
Browse files

PCI: irq: Add early_param pci_irq_limit to limit pci irq numbers 

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I7AHL9



--------------------------------

Signed-off-by: default avatarJuxin Gao <gaojuxin@loongson.cn>
Signed-off-by: default avatarHongchen Zhang <zhanghongchen@loongson.cn>
parent 7012ea3a

drivers/pci/msi/msi.c

+25 −0
Original line number Diff line number Diff line
@@ -402,12 +402,32 @@ static int msi_capability_init(struct pci_dev *dev, int nvec, 
	return ret;

}



#ifdef CONFIG_LOONGARCH

static unsigned int pci_irq_numbers = 32;



static int __init pci_irq_limit(char *str)

{

	get_option(&str, &pci_irq_numbers);



	if (pci_irq_numbers == 0)

		pci_irq_numbers = 32;

	return 0;

}



early_param("pci_irq_limit", pci_irq_limit);

#endif



int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,

			   struct irq_affinity *affd)

{

	int nvec;

	int rc;



#ifdef CONFIG_LOONGARCH

	if (maxvec > 32)

		maxvec = pci_irq_numbers;

#endif



	if (!pci_msi_supported(dev, minvec) || dev->current_state != PCI_D0)

		return -EINVAL;
@@ -778,6 +798,11 @@ int __pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries, int 
{

	int hwsize, rc, nvec = maxvec;



#ifdef CONFIG_LOONGARCH

	if (maxvec > 32)

		nvec = pci_irq_numbers;

#endif



	if (maxvec < minvec)

		return -ERANGE;