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400b9b9344
Kernel has few users of pasid_valid() and all but one checks if the process has PASID allocated. The helper takes ioasid_t as the input. Replace the helper with mm_valid_pasid() that takes mm_struct as the argument. The only call that checks PASID that is not tied to mm_struct is open-codded now. This is preparatory patch. It helps avoid ifdeffery: no need to dereference mm->pasid in generic code to check if the process has PASID. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/all/20230312112612.31869-11-kirill.shutemov%40linux.intel.com
75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_IOASID_H
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#define __LINUX_IOASID_H
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#include <linux/types.h>
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#include <linux/errno.h>
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#define INVALID_IOASID ((ioasid_t)-1)
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typedef unsigned int ioasid_t;
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typedef ioasid_t (*ioasid_alloc_fn_t)(ioasid_t min, ioasid_t max, void *data);
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typedef void (*ioasid_free_fn_t)(ioasid_t ioasid, void *data);
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struct ioasid_set {
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int dummy;
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};
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/**
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* struct ioasid_allocator_ops - IOASID allocator helper functions and data
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*
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* @alloc: helper function to allocate IOASID
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* @free: helper function to free IOASID
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* @list: for tracking ops that share helper functions but not data
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* @pdata: data belong to the allocator, provided when calling alloc()
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*/
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struct ioasid_allocator_ops {
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ioasid_alloc_fn_t alloc;
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ioasid_free_fn_t free;
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struct list_head list;
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void *pdata;
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};
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#define DECLARE_IOASID_SET(name) struct ioasid_set name = { 0 }
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#if IS_ENABLED(CONFIG_IOASID)
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ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min, ioasid_t max,
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void *private);
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void ioasid_free(ioasid_t ioasid);
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void *ioasid_find(struct ioasid_set *set, ioasid_t ioasid,
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bool (*getter)(void *));
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int ioasid_register_allocator(struct ioasid_allocator_ops *allocator);
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void ioasid_unregister_allocator(struct ioasid_allocator_ops *allocator);
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int ioasid_set_data(ioasid_t ioasid, void *data);
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#else /* !CONFIG_IOASID */
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static inline ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min,
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ioasid_t max, void *private)
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{
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return INVALID_IOASID;
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}
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static inline void ioasid_free(ioasid_t ioasid) { }
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static inline void *ioasid_find(struct ioasid_set *set, ioasid_t ioasid,
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bool (*getter)(void *))
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{
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return NULL;
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}
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static inline int ioasid_register_allocator(struct ioasid_allocator_ops *allocator)
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{
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return -ENOTSUPP;
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}
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static inline void ioasid_unregister_allocator(struct ioasid_allocator_ops *allocator)
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{
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}
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static inline int ioasid_set_data(ioasid_t ioasid, void *data)
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{
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return -ENOTSUPP;
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}
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#endif /* CONFIG_IOASID */
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#endif /* __LINUX_IOASID_H */
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