1 // SPDX-License-Identifier: GPL-2.0-only
7 #include "irq-msi-lib.h"
10  * msi_lib_init_dev_msi_info - Domain info setup for MSI domains
13  * @real_parent:	The real parent domain of the domain to be initialized
18  * This function is to be used for all types of MSI domains above the root
19  * parent domain and any intermediates. The topmost parent domain specific
30 	const struct msi_parent_ops *pops = real_parent->msi_parent_ops;  in msi_lib_init_dev_msi_info()
31 	struct irq_chip *chip = info->chip;  in msi_lib_init_dev_msi_info()
34 	/* Parent ops available? */  in msi_lib_init_dev_msi_info()
39 	 * MSI parent domain specific settings. For now there is only the  in msi_lib_init_dev_msi_info()
40 	 * root parent domain, e.g. NEXUS, acting as a MSI parent, but it is  in msi_lib_init_dev_msi_info()
41 	 * possible to stack MSI parents. See x86 vector -> irq remapping  in msi_lib_init_dev_msi_info()
43 	if (domain->bus_token == pops->bus_select_token) {  in msi_lib_init_dev_msi_info()
51 	required_flags = pops->required_flags;  in msi_lib_init_dev_msi_info()
54 	switch(info->bus_token) {  in msi_lib_init_dev_msi_info()
63 		 * Per device MSI should never have any MSI feature bits  in msi_lib_init_dev_msi_info()
68 		if (WARN_ON_ONCE(info->flags))  in msi_lib_init_dev_msi_info()
71 		/* Core managed MSI descriptors */  in msi_lib_init_dev_msi_info()
72 		info->flags = MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS | MSI_FLAG_FREE_MSI_DESCS;  in msi_lib_init_dev_msi_info()
88 	 * Mask out the domain specific MSI feature flags which are not  in msi_lib_init_dev_msi_info()
89 	 * supported by the real parent.  in msi_lib_init_dev_msi_info()
91 	info->flags			&= pops->supported_flags;  in msi_lib_init_dev_msi_info()
93 	info->flags			|= required_flags;  in msi_lib_init_dev_msi_info()
96 	if (!chip->irq_eoi && (pops->chip_flags & MSI_CHIP_FLAG_SET_EOI))  in msi_lib_init_dev_msi_info()
97 		chip->irq_eoi = irq_chip_eoi_parent;  in msi_lib_init_dev_msi_info()
98 	if (!chip->irq_ack && (pops->chip_flags & MSI_CHIP_FLAG_SET_ACK))  in msi_lib_init_dev_msi_info()
99 		chip->irq_ack = irq_chip_ack_parent;  in msi_lib_init_dev_msi_info()
102 	 * The device MSI domain can never have a set affinity callback. It  in msi_lib_init_dev_msi_info()
103 	 * always has to rely on the parent domain to handle affinity  in msi_lib_init_dev_msi_info()
104 	 * settings. The device MSI domain just has to write the resulting  in msi_lib_init_dev_msi_info()
105 	 * MSI message into the hardware which is the whole purpose of the  in msi_lib_init_dev_msi_info()
106 	 * device MSI domain aside of mask/unmask which is provided e.g. by  in msi_lib_init_dev_msi_info()
107 	 * PCI/MSI device domains.  in msi_lib_init_dev_msi_info()
109 	chip->irq_set_affinity = msi_domain_set_affinity;  in msi_lib_init_dev_msi_info()
115  * msi_lib_irq_domain_select - Shared select function for NEXUS domains
123  *		   if @d is providing the parent MSI domain for the functionality
129 	const struct msi_parent_ops *ops = d->msi_parent_ops;  in msi_lib_irq_domain_select()
135 	if (fwspec->fwnode != d->fwnode || fwspec->param_count != 0)  in msi_lib_irq_domain_select()
139 	if (bus_token == ops->bus_select_token)  in msi_lib_irq_domain_select()
142 	return !!(ops->bus_select_mask & busmask);  in msi_lib_irq_domain_select()