From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3CCA3C77B7C for ; Tue, 24 Jun 2025 21:13:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:CC:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ca3UcDl1zOIo+8XtbXTq634i3NsU5jZbqdlOm4MtkTc=; b=SFOMC2yM2cinrZW8q6pWHM0mkP 4oysXz7ncVC2oZ6N2rTu1wRTlL65VUU80iUFd+JdRy+ogZWSQCAfybejhN5dT2z7G1E+931yHFTyP sfqJfNbaiIguewJJfOzRRXehMH3VSJrJYSQr4hsYVPronw9Pa+cHjJ/UvkRqFmvu/1V+VE/9ROOJq EtnpE+Ezpjj7CbV0Lu6s3d0mS9JvqfBOSIQBH8IE3Qr3XoyE6KZruvHEQxfIZJutdsDMnX6aQQh8Z aHPnvt2CI60/+8hiGWC0enT7K9pN5I9c6FVTIMB0GT5Lmejb8fu2errV/Uq+EYVt0niVpY+3npGdp FacLVCmQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uUAxA-00000006qr5-0MrW; Tue, 24 Jun 2025 21:13:16 +0000 Received: from frasgout.his.huawei.com ([185.176.79.56]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uU5tb-00000006BbF-40Ky for linux-arm-kernel@lists.infradead.org; Tue, 24 Jun 2025 15:49:17 +0000 Received: from mail.maildlp.com (unknown [172.18.186.216]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4bRTlG0cDmz6J6l2; Tue, 24 Jun 2025 23:44:10 +0800 (CST) Received: from frapeml500008.china.huawei.com (unknown [7.182.85.71]) by mail.maildlp.com (Postfix) with ESMTPS id C993C1402EA; Tue, 24 Jun 2025 23:49:09 +0800 (CST) Received: from SecurePC-101-06.china.huawei.com (10.122.19.247) by frapeml500008.china.huawei.com (7.182.85.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Tue, 24 Jun 2025 17:49:08 +0200 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: [PATCH v2 2/8] generic: Support ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION Date: Tue, 24 Jun 2025 16:47:58 +0100 Message-ID: <20250624154805.66985-3-Jonathan.Cameron@huawei.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250624154805.66985-1-Jonathan.Cameron@huawei.com> References: <20250624154805.66985-1-Jonathan.Cameron@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.122.19.247] X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To frapeml500008.china.huawei.com (7.182.85.71) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250624_084916_280430_E9B08103 X-CRM114-Status: GOOD ( 16.36 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 --- drivers/base/Kconfig | 3 +++ drivers/base/Makefile | 1 + drivers/base/cache.c | 46 ++++++++++++++++++++++++++++++++ include/asm-generic/cacheflush.h | 12 +++++++++ 4 files changed, 62 insertions(+) diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig index 064eb52ff7e2..cc6df87a0a96 100644 --- a/drivers/base/Kconfig +++ b/drivers/base/Kconfig @@ -181,6 +181,9 @@ config SYS_HYPERVISOR bool default n +config GENERIC_CPU_CACHE_INVALIDATE_MEMREGION + bool + config GENERIC_CPU_DEVICES bool default n diff --git a/drivers/base/Makefile b/drivers/base/Makefile index 8074a10183dc..0fbfa4300b98 100644 --- a/drivers/base/Makefile +++ b/drivers/base/Makefile @@ -26,6 +26,7 @@ obj-$(CONFIG_DEV_COREDUMP) += devcoredump.o obj-$(CONFIG_GENERIC_MSI_IRQ) += platform-msi.o obj-$(CONFIG_GENERIC_ARCH_TOPOLOGY) += arch_topology.o obj-$(CONFIG_GENERIC_ARCH_NUMA) += arch_numa.o +obj-$(CONFIG_GENERIC_CPU_CACHE_INVALIDATE_MEMREGION) += cache.o obj-$(CONFIG_ACPI) += physical_location.o obj-y += test/ 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 +#include +#include + + +static const struct system_cache_flush_method *scfm_data; +DEFINE_SPINLOCK(scfm_lock); + +void generic_set_sys_cache_flush_method(const struct system_cache_flush_method *method) +{ + guard(spinlock_irqsave)(&scfm_lock); + if (scfm_data || !method || !method->invalidate_memregion) + return; + + scfm_data = method; +} +EXPORT_SYMBOL_GPL(generic_set_sys_cache_flush_method); + +void generic_clr_sys_cache_flush_method(const struct system_cache_flush_method *method) +{ + guard(spinlock_irqsave)(&scfm_lock); + if (scfm_data && scfm_data == method) + scfm_data = NULL; +} + +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"); diff --git a/include/asm-generic/cacheflush.h b/include/asm-generic/cacheflush.h index 7ee8a179d103..87e64295561e 100644 --- a/include/asm-generic/cacheflush.h +++ b/include/asm-generic/cacheflush.h @@ -124,4 +124,16 @@ static inline void flush_cache_vunmap(unsigned long start, unsigned long end) } while (0) #endif +#ifdef CONFIG_GENERIC_CPU_CACHE_INVALIDATE_MEMREGION + +struct system_cache_flush_method { + int (*invalidate_memregion)(int res_desc, + phys_addr_t start, size_t len); +}; + +void generic_set_sys_cache_flush_method(const struct system_cache_flush_method *method); +void generic_clr_sys_cache_flush_method(const struct system_cache_flush_method *method); + +#endif /* CONFIG_GENERIC_CPU_CACHE_INVALIDATE_MEMREGION */ + #endif /* _ASM_GENERIC_CACHEFLUSH_H */ -- 2.48.1