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Tue, 26 May 2026 20:31:01 -0700 (PDT) From: Wandun Chen To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, kexec@lists.infradead.org, iommu@lists.linux.dev, zhaomeijing@lixiang.com Cc: catalin.marinas@arm.com, will@kernel.org, chenhuacai@kernel.org, kernel@xen0n.name, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, robh@kernel.org, saravanak@kernel.org, akpm@linux-foundation.org, bhe@redhat.com, rppt@kernel.org, pasha.tatashin@soleen.com, pratyush@kernel.org, ruirui.yang@linux.dev, m.szyprowski@samsung.com, robin.murphy@arm.com, quic_obabatun@quicinc.com Subject: [PATCH v3 08/11] of: reserved_mem: add kdump helpers to exclude non-dumpable regions Date: Wed, 27 May 2026 11:29:14 +0800 Message-ID: <20260527032917.3385849-9-chenwandun1@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260527032917.3385849-1-chenwandun1@gmail.com> References: <20260527032917.3385849-1-chenwandun1@gmail.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Wandun Chen Add two helpers to exclude non-dumpable regions for arch-specific code. - of_reserved_mem_kdump_nr_ranges() returns the count of regions that are not dumpable. Each excluded region may split an existing crash_mem range into two, so callers use this to calculate crash_mem allocation size. - of_reserved_mem_kdump_exclude() walks reserved_mem[] and calls crash_exclude_mem_range() for every non-dumpable region. Signed-off-by: Wandun Chen Tested-by: Meijing Zhao --- drivers/of/of_reserved_mem.c | 34 +++++++++++++++++++++++++++++++++ include/linux/of_reserved_mem.h | 14 ++++++++++++++ 2 files changed, 48 insertions(+) diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c index 5e27f9403786..1d9aa332325b 100644 --- a/drivers/of/of_reserved_mem.c +++ b/drivers/of/of_reserved_mem.c @@ -24,6 +24,7 @@ #include #include #include +#include #include "of_private.h" @@ -858,6 +859,39 @@ struct reserved_mem *of_reserved_mem_lookup(struct device_node *np) } EXPORT_SYMBOL_GPL(of_reserved_mem_lookup); +/* + * Count non-dumpable reserved regions. Excluding each one may split a + * crash_mem range in two, callers use this to size the allocation. + */ +unsigned int of_reserved_mem_kdump_nr_ranges(void) +{ + unsigned int i, n = 0; + + for (i = 0; i < reserved_mem_count; i++) + if (reserved_mem[i].size && !reserved_mem[i].dumpable) + n++; + return n; +} + +/* Exclude non-dumpable reserved regions from @cmem. */ +int of_reserved_mem_kdump_exclude(struct crash_mem *cmem) +{ + unsigned int i; + int ret; + + for (i = 0; i < reserved_mem_count; i++) { + struct reserved_mem *r = &reserved_mem[i]; + + if (!r->size || r->dumpable) + continue; + ret = crash_exclude_mem_range(cmem, r->base, + r->base + r->size - 1); + if (ret) + return ret; + } + return 0; +} + /** * of_reserved_mem_region_to_resource() - Get a reserved memory region as a resource * @np: node containing 'memory-region' property diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h index 55a67cee41ea..70db99f1fbff 100644 --- a/include/linux/of_reserved_mem.h +++ b/include/linux/of_reserved_mem.h @@ -8,6 +8,7 @@ struct of_phandle_args; struct reserved_mem_ops; struct resource; +struct crash_mem; struct reserved_mem { const char *name; @@ -48,6 +49,9 @@ int of_reserved_mem_region_to_resource_byname(const struct device_node *np, const char *name, struct resource *res); int of_reserved_mem_region_count(const struct device_node *np); +unsigned int of_reserved_mem_kdump_nr_ranges(void); +int of_reserved_mem_kdump_exclude(struct crash_mem *cmem); + #else #define RESERVEDMEM_OF_DECLARE(name, compat, ops) \ @@ -92,6 +96,16 @@ static inline int of_reserved_mem_region_count(const struct device_node *np) { return 0; } + +static inline unsigned int of_reserved_mem_kdump_nr_ranges(void) +{ + return 0; +} + +static inline int of_reserved_mem_kdump_exclude(struct crash_mem *cmem) +{ + return 0; +} #endif /** -- 2.43.0