[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [PATCH v1 12/29] xen/asm-generic: introduce stub header pci.h
On Mon, 2023-10-30 at 17:43 +0100, Jan Beulich wrote: > On 30.10.2023 17:34, Oleksii wrote: > > Hello Jan, > > > > On Thu, 2023-10-19 at 11:55 +0200, Jan Beulich wrote: > > > On 14.09.2023 16:56, Oleksii Kurochko wrote: > > > > --- /dev/null > > > > +++ b/xen/include/asm-generic/pci.h > > > > @@ -0,0 +1,18 @@ > > > > +/* SPDX-License-Identifier: GPL-2.0-only */ > > > > +#ifndef __ASM_GENERIC_PCI_H__ > > > > +#define __ASM_GENERIC_PCI_H__ > > > > + > > > > +struct arch_pci_dev { > > > > +}; > > > > + > > > > +#endif /* __ASM_GENERIC_PCI_H__ */ > > > > > > While more involved, I still wonder whether xen/pci.h could also > > > avoid > > > including asm/pci.h when !HAS_PCI. Of course there's more than > > > just > > > the > > > #include which then would need #ifdef-ing out. > > > > > > Jan > > > > It looks like we can do that but only one question should be > > resolved. > > In ARM case, in <asm/pci.h> there is !HAS_PCI branch: > > > > #else /*!CONFIG_HAS_PCI*/ > > > > struct arch_pci_dev { }; > > > > static always_inline bool is_pci_passthrough_enabled(void) > > { > > return false; > > } > > > > struct pci_dev; > > > > static inline void arch_pci_init_pdev(struct pci_dev *pdev) {} > > > > static inline int pci_get_host_bridge_segment(const struct > > dt_device_node *node, > > uint16_t *segment) > > { > > ASSERT_UNREACHABLE(); > > return -EINVAL; > > } > > > > static inline int pci_get_new_domain_nr(void) > > { > > ASSERT_UNREACHABLE(); > > return -1; > > } > > > > #endif /*!CONFIG_HAS_PCI*/ > > > > And if is_pci_passthrough_enabled(), arch_pci_init_pdev() is used > > by > > all architrectures but pci_get_host_bridge_segment() and > > pci_get_new_domain_nr() is ARM specific. > > Does it make sense to add them to <xen/pci.h> and ifdef them? > > Counter question: Is the arch_pci_init_pdev() stub actually needed? > The sole caller looks to be in a file which is only built when > HAS_PCI=y. You are right. It seems that there is no need for pci_init_pdev() stub. > > For the Arm-only stubs (which are called from Arm-specific code > afaics) > all it would take is that the respective .c files include asm/pci.h > (possibly alongside xen/pci.h). We can do in that way. Thanks. ~ Oleksii
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