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Shutemov" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/mm] iommu/sva: Replace pasid_valid() helper with mm_valid_pasid() Cc: "Kirill A. Shutemov" , Dave Hansen , x86@kernel.org, linux-kernel@vger.kernel.org MIME-Version: 1.0 Message-ID: <166820390523.4906.11328016242925887203.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the x86/mm branch of tip: Commit-ID: e79114b17b8149237071cf353edf379c597829e9 Gitweb: https://git.kernel.org/tip/e79114b17b8149237071cf353edf379c5= 97829e9 Author: Kirill A. Shutemov AuthorDate: Wed, 09 Nov 2022 19:51:34 +03:00 Committer: Dave Hansen CommitterDate: Fri, 11 Nov 2022 13:29:55 -08:00 iommu/sva: Replace pasid_valid() helper with mm_valid_pasid() 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 Signed-off-by: Dave Hansen Link: https://lore.kernel.org/all/20221109165140.9137-11-kirill.shutemov%40= linux.intel.com --- arch/x86/kernel/traps.c | 6 +++--- drivers/iommu/iommu-sva-lib.c | 4 ++-- include/linux/ioasid.h | 9 --------- include/linux/sched/mm.h | 8 +++++++- 4 files changed, 12 insertions(+), 15 deletions(-) diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 178015a..3bdc37a 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -664,15 +664,15 @@ static bool try_fixup_enqcmd_gp(void) if (!cpu_feature_enabled(X86_FEATURE_ENQCMD)) return false; =20 - pasid =3D current->mm->pasid; - /* * If the mm has not been allocated a * PASID, the #GP can not be fixed up. */ - if (!pasid_valid(pasid)) + if (!mm_valid_pasid(current->mm)) return false; =20 + pasid =3D current->mm->pasid; + /* * Did this thread already have its PASID activated? * If so, the #GP must be from something else. diff --git a/drivers/iommu/iommu-sva-lib.c b/drivers/iommu/iommu-sva-lib.c index 1065061..27be6b8 100644 --- a/drivers/iommu/iommu-sva-lib.c +++ b/drivers/iommu/iommu-sva-lib.c @@ -33,14 +33,14 @@ int iommu_sva_alloc_pasid(struct mm_struct *mm, ioasid_= t min, ioasid_t max) =20 mutex_lock(&iommu_sva_lock); /* Is a PASID already associated with this mm? */ - if (pasid_valid(mm->pasid)) { + if (mm_valid_pasid(mm)) { if (mm->pasid < min || mm->pasid >=3D max) ret =3D -EOVERFLOW; goto out; } =20 pasid =3D ioasid_alloc(&iommu_sva_pasid, min, max, mm); - if (!pasid_valid(pasid)) + if (pasid =3D=3D INVALID_IOASID) ret =3D -ENOMEM; else mm_pasid_set(mm, pasid); diff --git a/include/linux/ioasid.h b/include/linux/ioasid.h index af1c9d6..836ae09 100644 --- a/include/linux/ioasid.h +++ b/include/linux/ioasid.h @@ -40,10 +40,6 @@ void *ioasid_find(struct ioasid_set *set, ioasid_t ioasi= d, int ioasid_register_allocator(struct ioasid_allocator_ops *allocator); void ioasid_unregister_allocator(struct ioasid_allocator_ops *allocator); int ioasid_set_data(ioasid_t ioasid, void *data); -static inline bool pasid_valid(ioasid_t ioasid) -{ - return ioasid !=3D INVALID_IOASID; -} =20 #else /* !CONFIG_IOASID */ static inline ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min, @@ -74,10 +70,5 @@ static inline int ioasid_set_data(ioasid_t ioasid, void = *data) return -ENOTSUPP; } =20 -static inline bool pasid_valid(ioasid_t ioasid) -{ - return false; -} - #endif /* CONFIG_IOASID */ #endif /* __LINUX_IOASID_H */ diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h index 2a24361..b69fe7e 100644 --- a/include/linux/sched/mm.h +++ b/include/linux/sched/mm.h @@ -457,6 +457,11 @@ static inline void mm_pasid_init(struct mm_struct *mm) mm->pasid =3D INVALID_IOASID; } =20 +static inline bool mm_valid_pasid(struct mm_struct *mm) +{ + return mm->pasid !=3D INVALID_IOASID; +} + /* Associate a PASID with an mm_struct: */ static inline void mm_pasid_set(struct mm_struct *mm, u32 pasid) { @@ -465,13 +470,14 @@ static inline void mm_pasid_set(struct mm_struct *mm,= u32 pasid) =20 static inline void mm_pasid_drop(struct mm_struct *mm) { - if (pasid_valid(mm->pasid)) { + if (mm_valid_pasid(mm)) { ioasid_free(mm->pasid); mm->pasid =3D INVALID_IOASID; } } #else static inline void mm_pasid_init(struct mm_struct *mm) {} +static inline bool mm_valid_pasid(struct mm_struct *mm) { return false; } static inline void mm_pasid_set(struct mm_struct *mm, u32 pasid) {} static inline void mm_pasid_drop(struct mm_struct *mm) {} #endif