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Sun, 15 Dec 2019 17:41:03 -0800 (PST) Date: Mon, 16 Dec 2019 10:43:07 +0900 From: AKASHI Takahiro To: Bhupesh Sharma Subject: Re: [PATCH v2 3/3] arm64: kexec_file: add crash dump support Message-ID: <20191216014306.GG22427@linaro.org> Mail-Followup-To: AKASHI Takahiro , Bhupesh Sharma , catalin.marinas@arm.com, will.deacon@arm.com, robh+dt@kernel.org, frowand.list@gmail.com, kexec@lists.infradead.org, james.morse@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20191114051510.17037-1-takahiro.akashi@linaro.org> <20191114051510.17037-4-takahiro.akashi@linaro.org> <679aba8b-c03d-8a15-46f1-3dc158c24fe9@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <679aba8b-c03d-8a15-46f1-3dc158c24fe9@redhat.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191215_174105_852736_444EB10D X-CRM114-Status: GOOD ( 23.20 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, robh+dt@kernel.org, james.morse@arm.com, frowand.list@gmail.com, kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org I have forgot to address Bhupesh's comment below in my v3. I'm going to repost my patch. Thank you, Bhupesh, for your review. -Takahiro Akashi On Thu, Dec 05, 2019 at 02:14:14AM +0530, Bhupesh Sharma wrote: > On 11/14/2019 10:45 AM, AKASHI Takahiro wrote: > >Enabling crash dump (kdump) includes > >* prepare contents of ELF header of a core dump file, /proc/vmcore, > > using crash_prepare_elf64_headers(), and > >* add two device tree properties, "linux,usable-memory-range" and > > "linux,elfcorehdr", which represent respectively a memory range > > to be used by crash dump kernel and the header's location > > > >Signed-off-by: AKASHI Takahiro > >Cc: Catalin Marinas > >Cc: Will Deacon > >Reviewed-by: James Morse > >--- > > arch/arm64/include/asm/kexec.h | 4 + > > arch/arm64/kernel/kexec_image.c | 4 - > > arch/arm64/kernel/machine_kexec_file.c | 106 ++++++++++++++++++++++++- > > 3 files changed, 106 insertions(+), 8 deletions(-) > > > >diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h > >index 12a561a54128..d24b527e8c00 100644 > >--- a/arch/arm64/include/asm/kexec.h > >+++ b/arch/arm64/include/asm/kexec.h > >@@ -96,6 +96,10 @@ static inline void crash_post_resume(void) {} > > struct kimage_arch { > > void *dtb; > > unsigned long dtb_mem; > >+ /* Core ELF header buffer */ > >+ void *elf_headers; > >+ unsigned long elf_headers_mem; > >+ unsigned long elf_headers_sz; > > }; > > extern const struct kexec_file_ops kexec_image_ops; > >diff --git a/arch/arm64/kernel/kexec_image.c b/arch/arm64/kernel/kexec_image.c > >index 29a9428486a5..af9987c154ca 100644 > >--- a/arch/arm64/kernel/kexec_image.c > >+++ b/arch/arm64/kernel/kexec_image.c > >@@ -47,10 +47,6 @@ static void *image_load(struct kimage *image, > > struct kexec_segment *kernel_segment; > > int ret; > >- /* We don't support crash kernels yet. */ > >- if (image->type == KEXEC_TYPE_CRASH) > >- return ERR_PTR(-EOPNOTSUPP); > >- > > /* > > * We require a kernel with an unambiguous Image header. Per > > * Documentation/arm64/booting.rst, this is the case when image_size > >diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c > >index 7b08bf9499b6..f1d1bb895fd2 100644 > >--- a/arch/arm64/kernel/machine_kexec_file.c > >+++ b/arch/arm64/kernel/machine_kexec_file.c > >@@ -17,12 +17,15 @@ > > #include > > #include > > #include > >+#include > > #include > > #include > > #include > > #include > > /* relevant device tree properties */ > >+#define FDT_PROP_KEXEC_ELFHDR "linux,elfcorehdr" > >+#define FDT_PROP_MEM_RANGE "linux,usable-memory-range" > > #define FDT_PROP_INITRD_START "linux,initrd-start" > > #define FDT_PROP_INITRD_END "linux,initrd-end" > > #define FDT_PROP_BOOTARGS "bootargs" > >@@ -40,6 +43,10 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image) > > vfree(image->arch.dtb); > > image->arch.dtb = NULL; > >+ vfree(image->arch.elf_headers); > >+ image->arch.elf_headers = NULL; > >+ image->arch.elf_headers_sz = 0; > >+ > > return kexec_image_post_load_cleanup_default(image); > > } > >@@ -55,6 +62,31 @@ static int setup_dtb(struct kimage *image, > > off = ret; > >+ ret = fdt_delprop(dtb, off, FDT_PROP_KEXEC_ELFHDR); > >+ if (ret && ret != -FDT_ERR_NOTFOUND) > >+ goto out; > >+ ret = fdt_delprop(dtb, off, FDT_PROP_MEM_RANGE); > >+ if (ret && ret != -FDT_ERR_NOTFOUND) > >+ goto out; > >+ > >+ if (image->type == KEXEC_TYPE_CRASH) { > >+ /* add linux,elfcorehdr */ > >+ ret = fdt_appendprop_addrrange(dtb, 0, off, > >+ FDT_PROP_KEXEC_ELFHDR, > >+ image->arch.elf_headers_mem, > >+ image->arch.elf_headers_sz); > >+ if (ret) > >+ return (ret == -FDT_ERR_NOSPACE ? -ENOMEM : -EINVAL); > >+ > >+ /* add linux,usable-memory-range */ > >+ ret = fdt_appendprop_addrrange(dtb, 0, off, > >+ FDT_PROP_MEM_RANGE, > >+ crashk_res.start, > >+ crashk_res.end - crashk_res.start + 1); > >+ if (ret) > >+ return (ret == -FDT_ERR_NOSPACE ? -ENOMEM : -EINVAL); > >+ } > >+ > > /* add bootargs */ > > if (cmdline) { > > ret = fdt_setprop_string(dtb, off, FDT_PROP_BOOTARGS, cmdline); > >@@ -125,8 +157,8 @@ static int setup_dtb(struct kimage *image, > > } > > /* > >- * More space needed so that we can add initrd, bootargs, kaslr-seed, and > >- * rng-seed. > >+ * More space needed so that we can add initrd, bootargs, kaslr-seed, > >+ * rng-seed, userable-memory-range and elfcorehdr. > > nitpick: > s/userable-memory-range/usable-memory-range > > > */ > > #define DTB_EXTRA_SPACE 0x1000 > >@@ -174,6 +206,43 @@ static int create_dtb(struct kimage *image, > > } > > } > >+static int prepare_elf_headers(void **addr, unsigned long *sz) > >+{ > >+ struct crash_mem *cmem; > >+ unsigned int nr_ranges; > >+ int ret; > >+ u64 i; > >+ phys_addr_t start, end; > >+ > >+ nr_ranges = 1; /* for exclusion of crashkernel region */ > >+ for_each_mem_range(i, &memblock.memory, NULL, NUMA_NO_NODE, > >+ MEMBLOCK_NONE, &start, &end, NULL) > >+ nr_ranges++; > >+ > >+ cmem = kmalloc(sizeof(struct crash_mem) + > >+ sizeof(struct crash_mem_range) * nr_ranges, GFP_KERNEL); > >+ if (!cmem) > >+ return -ENOMEM; > >+ > >+ cmem->max_nr_ranges = nr_ranges; > >+ cmem->nr_ranges = 0; > >+ for_each_mem_range(i, &memblock.memory, NULL, NUMA_NO_NODE, > >+ MEMBLOCK_NONE, &start, &end, NULL) { > >+ cmem->ranges[cmem->nr_ranges].start = start; > >+ cmem->ranges[cmem->nr_ranges].end = end - 1; > >+ cmem->nr_ranges++; > >+ } > >+ > >+ /* Exclude crashkernel region */ > >+ ret = crash_exclude_mem_range(cmem, crashk_res.start, crashk_res.end); > >+ > >+ if (!ret) > >+ ret = crash_prepare_elf64_headers(cmem, true, addr, sz); > >+ > >+ kfree(cmem); > >+ return ret; > >+} > >+ > > int load_other_segments(struct kimage *image, > > unsigned long kernel_load_addr, > > unsigned long kernel_size, > >@@ -181,14 +250,43 @@ int load_other_segments(struct kimage *image, > > char *cmdline) > > { > > struct kexec_buf kbuf; > >- void *dtb = NULL; > >- unsigned long initrd_load_addr = 0, dtb_len; > >+ void *headers, *dtb = NULL; > >+ unsigned long headers_sz, initrd_load_addr = 0, dtb_len; > > int ret = 0; > > kbuf.image = image; > > /* not allocate anything below the kernel */ > > kbuf.buf_min = kernel_load_addr + kernel_size; > >+ /* load elf core header */ > >+ if (image->type == KEXEC_TYPE_CRASH) { > >+ ret = prepare_elf_headers(&headers, &headers_sz); > >+ if (ret) { > >+ pr_err("Preparing elf core header failed\n"); > >+ goto out_err; > >+ } > >+ > >+ kbuf.buffer = headers; > >+ kbuf.bufsz = headers_sz; > >+ kbuf.mem = 0; > > With commit c19d050f8088 ("arm64/kexec: Use consistent convention of > initializing 'kxec_buf.mem' with KEXEC_BUF_MEM_UNKNOWN"), we are trying to > standardize the way of setting up initial value of 'kbuf.mem'. So we can use > the following notion (in v3?) instead: > kbuf.mem = KEXEC_BUF_MEM_UNKNOWN; > > >+ kbuf.memsz = headers_sz; > >+ kbuf.buf_align = SZ_64K; /* largest supported page size */ > >+ kbuf.buf_max = ULONG_MAX; > >+ kbuf.top_down = true; > >+ > >+ ret = kexec_add_buffer(&kbuf); > >+ if (ret) { > >+ vfree(headers); > >+ goto out_err; > >+ } > >+ image->arch.elf_headers = headers; > >+ image->arch.elf_headers_mem = kbuf.mem; > >+ image->arch.elf_headers_sz = headers_sz; > >+ > >+ pr_debug("Loaded elf core header at 0x%lx bufsz=0x%lx memsz=0x%lx\n", > >+ image->arch.elf_headers_mem, headers_sz, headers_sz); > >+ } > >+ > > /* load initrd */ > > if (initrd) { > > kbuf.buffer = initrd; > > > > Thanks, > Bhupesh > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel