From: Thiago Jung Bauermann <bauerman@linux.ibm.com>
To: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Cc: zohar@linux.ibm.com, robh@kernel.org, gregkh@linuxfoundation.org,
james.morse@arm.com, catalin.marinas@arm.com, sashal@kernel.org,
will@kernel.org, mpe@ellerman.id.au, benh@kernel.crashing.org,
paulus@samba.org, robh+dt@kernel.org, frowand.list@gmail.com,
vincenzo.frascino@arm.com, mark.rutland@arm.com,
dmitry.kasatkin@gmail.com, jmorris@namei.org, serge@hallyn.com,
pasha.tatashin@soleen.com, allison@lohutok.net,
kstewart@linuxfoundation.org, takahiro.akashi@linaro.org,
tglx@linutronix.de, masahiroy@kernel.org, bhsharma@redhat.com,
mbrugger@suse.com, hsinyi@chromium.org, tao.li@vivo.com,
christophe.leroy@c-s.fr, linux-integrity@vger.kernel.org,
linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
prsriva@linux.microsoft.com, balajib@linux.microsoft.com
Subject: Re: [PATCH v10 2/8] powerpc: Move delete_fdt_mem_rsv() to drivers/of/kexec.c
Date: Fri, 04 Dec 2020 23:22:43 -0300 [thread overview]
Message-ID: <87ft4louto.fsf@manicouagan.localdomain> (raw)
In-Reply-To: <20201204195149.611-3-nramas@linux.microsoft.com>
Hello Lakshmi,
Lakshmi Ramasubramanian <nramas@linux.microsoft.com> writes:
> delete_fdt_mem_rsv() retrieves the memory reserve map entry, for
> the given starting address and size, from the device tree blob, and
> removes the entry from the device tree blob. This function is called
> to free the resources reserved for the buffer used for carrying forward
> the IMA measurement logs on kexec. This function does not have
> architecture specific code, but is currently limited to powerpc.
>
> Move delete_fdt_mem_rsv() to "drivers/of/kexec_fdt.c" so that it is
s/kexec_fdt.c/kexec.c/
> accessible for other architectures as well.
>
> Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
> Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> ---
> arch/powerpc/include/asm/kexec.h | 1 -
> arch/powerpc/kexec/file_load.c | 32 -----------------
> drivers/of/Makefile | 1 +
> drivers/of/kexec.c | 61 ++++++++++++++++++++++++++++++++
> include/linux/kexec.h | 5 +++
> 5 files changed, 67 insertions(+), 33 deletions(-)
> create mode 100644 drivers/of/kexec.c
>
> diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
> index 55d6ede30c19..7c223031ecdd 100644
> --- a/arch/powerpc/include/asm/kexec.h
> +++ b/arch/powerpc/include/asm/kexec.h
> @@ -126,7 +126,6 @@ int setup_purgatory(struct kimage *image, const void *slave_code,
> int setup_new_fdt(const struct kimage *image, void *fdt,
> unsigned long initrd_load_addr, unsigned long initrd_len,
> const char *cmdline);
> -int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size);
>
> #ifdef CONFIG_PPC64
> struct kexec_buf;
> diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
> index 9a232bc36c8f..9efc98b1e2ae 100644
> --- a/arch/powerpc/kexec/file_load.c
> +++ b/arch/powerpc/kexec/file_load.c
> @@ -109,38 +109,6 @@ int setup_purgatory(struct kimage *image, const void *slave_code,
> return 0;
> }
>
> -/**
> - * delete_fdt_mem_rsv - delete memory reservation with given address and size
> - *
> - * Return: 0 on success, or negative errno on error.
> - */
> -int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size)
> -{
> - int i, ret, num_rsvs = fdt_num_mem_rsv(fdt);
> -
> - for (i = 0; i < num_rsvs; i++) {
> - uint64_t rsv_start, rsv_size;
> -
> - ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size);
> - if (ret) {
> - pr_err("Malformed device tree.\n");
> - return -EINVAL;
> - }
> -
> - if (rsv_start == start && rsv_size == size) {
> - ret = fdt_del_mem_rsv(fdt, i);
> - if (ret) {
> - pr_err("Error deleting device tree reservation.\n");
> - return -EINVAL;
> - }
> -
> - return 0;
> - }
> - }
> -
> - return -ENOENT;
> -}
> -
> /*
> * setup_new_fdt - modify /chosen and memory reservation for the next kernel
> * @image: kexec image being loaded.
> diff --git a/drivers/of/Makefile b/drivers/of/Makefile
> index 6e1e5212f058..77d24712c0c8 100644
> --- a/drivers/of/Makefile
> +++ b/drivers/of/Makefile
> @@ -13,5 +13,6 @@ obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o
> obj-$(CONFIG_OF_RESOLVE) += resolver.o
> obj-$(CONFIG_OF_OVERLAY) += overlay.o
> obj-$(CONFIG_OF_NUMA) += of_numa.o
> +obj-$(CONFIG_OF_FLATTREE) += kexec.o
Isn't this too broad? kexec.o will only be useful to kernel configs
which enable CONFIG_KEXEC_FILE, so perhaps do:
ifdef CONFIG_OF_FLATTREE
ifdef CONFIG_KEXEC_FILE
obj-y += kexec.o
endif
endif
What do you think?
> obj-$(CONFIG_OF_UNITTEST) += unittest-data/
> diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
> new file mode 100644
> index 000000000000..b7d59105fcb8
> --- /dev/null
> +++ b/drivers/of/kexec.c
> @@ -0,0 +1,61 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2020 Microsoft Corporation
> + *
> + * Author: Lakshmi Ramasubramanian (nramas@linux.microsoft.com)
> + *
> + * File: kexec.c
> + * Defines kexec related functions.
> + */
> +
> +#define pr_fmt(fmt) "OF: kexec: " fmt
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/memblock.h>
> +#include <linux/kexec.h>
> +#include <linux/of.h>
> +#include <linux/of_fdt.h>
> +#include <linux/libfdt.h>
> +
> +/**
> + * delete_fdt_mem_rsv - delete memory reservation with given address and size
> + *
> + * @fdt: Flattened Device Tree to update
> + * @start: Starting address of the reservation to delete
> + * @size: Size of the reservation to delete
> + *
> + * Return: 0 on success, or negative errno on error.
> + */
> +int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size)
> +{
> + int i, ret, num_rsvs;
> +
> + if (!IS_ENABLED(CONFIG_KEXEC_FILE))
> + return 0;
If you agree with my suggestion, then this IS_ENABLED() wouldn't be
needed.
> +
> + num_rsvs = fdt_num_mem_rsv(fdt);
> + for (i = 0; i < num_rsvs; i++) {
> + uint64_t rsv_start, rsv_size;
> +
> + ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size);
> + if (ret) {
> + pr_err("Malformed device tree.\n");
> + return -EINVAL;
> + }
> +
> + if (rsv_start == start && rsv_size == size) {
> + ret = fdt_del_mem_rsv(fdt, i);
> + if (ret) {
> + pr_err("Error deleting device tree reservation.\n");
> + return -EINVAL;
> + }
> +
> + pr_debug("Freed reserved memory at %lu of size %lu\n",
> + start, size);
> + return 0;
> + }
> + }
> +
> + return -ENOENT;
> +}
The function code is unchanged apart from the addition of the
IS_ENABLED() and the pr_debug(), so that is good.
> diff --git a/include/linux/kexec.h b/include/linux/kexec.h
> index 9e93bef52968..d0234c4815da 100644
> --- a/include/linux/kexec.h
> +++ b/include/linux/kexec.h
> @@ -407,6 +407,11 @@ static inline int kexec_crash_loaded(void) { return 0; }
> #define kexec_in_progress false
> #endif /* CONFIG_KEXEC_CORE */
>
> +#if defined(CONFIG_OF_FLATTREE)
This would also change to require CONFIG_KEXEC_FILE.
> +extern int delete_fdt_mem_rsv(void *fdt, unsigned long start,
> + unsigned long size);
> +#endif /* CONFIG_OF_FLATTREE */
> +
> #endif /* !defined(__ASSEBMLY__) */
>
> #endif /* LINUX_KEXEC_H */
--
Thiago Jung Bauermann
IBM Linux Technology Center
next prev parent reply other threads:[~2020-12-05 2:24 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-04 19:51 [PATCH v10 0/8] Carry forward IMA measurement log on kexec on ARM64 Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 1/8] powerpc: fix compiler warnings and errors Lakshmi Ramasubramanian
2020-12-05 1:20 ` Thiago Jung Bauermann
2020-12-04 19:51 ` [PATCH v10 2/8] powerpc: Move delete_fdt_mem_rsv() to drivers/of/kexec.c Lakshmi Ramasubramanian
2020-12-05 2:22 ` Thiago Jung Bauermann [this message]
2020-12-07 1:50 ` Lakshmi Ramasubramanian
2020-12-11 16:37 ` Lakshmi Ramasubramanian
2020-12-11 18:19 ` Thiago Jung Bauermann
2020-12-11 19:25 ` Lakshmi Ramasubramanian
2020-12-12 1:14 ` Thiago Jung Bauermann
2020-12-04 19:51 ` [PATCH v10 3/8] powerpc: Move ima buffer functions " Lakshmi Ramasubramanian
2020-12-05 19:48 ` Thiago Jung Bauermann
2020-12-07 1:53 ` Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 4/8] powerpc: Use ima kexec node functions Lakshmi Ramasubramanian
2020-12-05 19:51 ` Thiago Jung Bauermann
2020-12-07 1:54 ` Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 5/8] powerpc: Move remove_ima_buffer() to drivers/of/kexec.c Lakshmi Ramasubramanian
2020-12-05 20:14 ` Thiago Jung Bauermann
2020-12-07 1:57 ` Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 6/8] powerpc: Move ima_get_kexec_buffer() and ima_free_kexec_buffer() to ima Lakshmi Ramasubramanian
2020-12-05 21:02 ` Thiago Jung Bauermann
2020-12-07 1:58 ` Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 7/8] powerpc: Move arch_ima_add_kexec_buffer " Lakshmi Ramasubramanian
2020-12-05 21:36 ` Thiago Jung Bauermann
2020-12-07 2:03 ` Lakshmi Ramasubramanian
2020-12-07 14:57 ` Mimi Zohar
2020-12-04 19:51 ` [PATCH v10 8/8] arm64: Add IMA log information in kimage used for kexec Lakshmi Ramasubramanian
2020-12-05 21:44 ` Thiago Jung Bauermann
2020-12-07 2:05 ` Lakshmi Ramasubramanian
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