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Wed, 25 Jun 2025 18:46:39 +0200 Date: Wed, 25 Jun 2025 17:46:37 +0100 From: Jonathan Cameron To: Catalin Marinas , , , , , , , , Will Deacon , Dan Williams , Davidlohr Bueso , CC: Yicong Yang , Yushan Wang , Lorenzo Pieralisi , "Mark Rutland" , Dave Hansen , Thomas Gleixner , Ingo Molnar , Borislav Petkov , , H Peter Anvin , Andy Lutomirski , Peter Zijlstra Subject: Re: [PATCH v2 2/8] generic: Support ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION Message-ID: <20250625174637.0000732b@huawei.com> In-Reply-To: <20250624154805.66985-3-Jonathan.Cameron@huawei.com> References: <20250624154805.66985-1-Jonathan.Cameron@huawei.com> <20250624154805.66985-3-Jonathan.Cameron@huawei.com> X-Mailer: Claws Mail 4.3.0 (GTK 3.24.42; x86_64-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.203.177.66] X-ClientProxiedBy: lhrpeml100003.china.huawei.com (7.191.160.210) To frapeml500008.china.huawei.com (7.182.85.71) X-Rspam-User: X-Stat-Signature: yknzax6g5hr8wsybraekdxhwynna7isj X-Rspamd-Queue-Id: 7D0B8140004 X-Rspamd-Server: rspam08 X-HE-Tag: 1750870003-813291 X-HE-Meta: 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 5baiTHLg 3DKge X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 24 Jun 2025 16:47:58 +0100 Jonathan Cameron wrote: > From: Yicong Yang > > ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION provides the mechanism for > invalidate certain memory regions in a cache-incoherent manner. > Currently is used by NVIDMM adn CXL memory. This is mainly done > by the system component and is implementation define per spec. > Provides a method for the platforms register their own invalidate > method and implement ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION. > > Architectures can opt in for this support via > CONFIG_GENERIC_CPU_CACHE_INVALIDATE_MEMREGION. > > Signed-off-by: Yicong Yang > Signed-off-by: Jonathan Cameron > diff --git a/drivers/base/cache.c b/drivers/base/cache.c > new file mode 100644 > index 000000000000..8d351657bbef > --- /dev/null > +++ b/drivers/base/cache.c > @@ -0,0 +1,46 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Generic support for CPU Cache Invalidate Memregion > + */ > + > +#include I got carried away dropping some unused headers. This needs linux/memregion.h > +#include > +#include > + So that the following have 'previous' prototypes. > +int cpu_cache_invalidate_memregion(int res_desc, phys_addr_t start, size_t len) > +{ > + guard(spinlock_irqsave)(&scfm_lock); > + if (!scfm_data) > + return -EOPNOTSUPP; > + > + return scfm_data->invalidate_memregion(res_desc, start, len); > +} > +EXPORT_SYMBOL_NS_GPL(cpu_cache_invalidate_memregion, "DEVMEM"); > + > +bool cpu_cache_has_invalidate_memregion(void) > +{ > + guard(spinlock_irqsave)(&scfm_lock); > + return !!scfm_data; > +} > +EXPORT_SYMBOL_NS_GPL(cpu_cache_has_invalidate_memregion, "DEVMEM");