From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
To: Shannon Zhao <zhaoshenglong@huawei.com>
Cc: <linux-arm-kernel@lists.infradead.org>,
<ard.biesheuvel@linaro.org>, <mark.rutland@arm.com>,
<stefano.stabellini@citrix.com>, <david.vrabel@citrix.com>,
<catalin.marinas@arm.com>, <will.deacon@arm.com>,
<julien.grall@citrix.com>, <xen-devel@lists.xen.org>,
<devicetree@vger.kernel.org>, <linux-efi@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <ian.campbell@citrix.com>,
<shannon.zhao@linaro.org>, <peter.huangpeng@huawei.com>,
Rob Herring <robh@kernel.org>
Subject: Re: [PATCH v3 16/17] FDT: Add a helper to get specified name subnode
Date: Tue, 26 Jan 2016 12:11:24 +0000 [thread overview]
Message-ID: <alpine.DEB.2.02.1601261156340.3619@kaball.uk.xensource.com> (raw)
In-Reply-To: <1453519184-11908-17-git-send-email-zhaoshenglong@huawei.com>
On Sat, 23 Jan 2016, Shannon Zhao wrote:
> From: Shannon Zhao <shannon.zhao@linaro.org>
>
> Sometimes it needs to check if there is a node in FDT by full path.
> Introduce this helper to get the specified name subnode if it exists.
>
> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> ---
> CC: Rob Herring <robh@kernel.org>
> ---
> drivers/of/fdt.c | 35 +++++++++++++++++++++++++++++++++++
> include/linux/of_fdt.h | 2 ++
> 2 files changed, 37 insertions(+)
>
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index 655f79d..112ec16 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -645,6 +645,41 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node,
> }
>
> /**
> + * of_get_flat_dt_subnode_by_name - get subnode of specified node by name
> + *
> + * @node: the parent node
> + * @uname: the name of subnode
> + * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none
> + */
> +
> +int of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname)
> +{
> + const void *blob = initial_boot_params;
> + int offset;
> + const char *pathp;
> +
> + /* Find first subnode if it exists */
> + offset = fdt_first_subnode(blob, node);
> + if (offset < 0)
> + return -FDT_ERR_NOTFOUND;
> + pathp = fdt_get_name(blob, offset, NULL);
> + if (strncmp(pathp, uname, strlen(uname)) == 0)
> + return offset;
Wouldn't this check succeed even if uname is "uefi" and the node
name is actually "uefiiiii"? You might have to use strcmp.
> + /* Find other subnodes */
> + do {
> + offset = fdt_next_subnode(blob, offset);
> + if (offset < 0)
> + return -FDT_ERR_NOTFOUND;
> + pathp = fdt_get_name(blob, offset, NULL);
> + if (strncmp(pathp, uname, strlen(uname)) == 0)
> + return offset;
> + } while (offset >= 0);
Rather than writing the name check twice, I think it would be best to
code this loop as:
for (offset = fdt_first_subnode(blob, offset);
offset >= 0;
offset = fdt_next_subnode(blob, offset)) {
/* do name check */
> + return -FDT_ERR_NOTFOUND;
> +}
> +
> +/**
> * of_get_flat_dt_root - find the root node in the flat blob
> */
> unsigned long __init of_get_flat_dt_root(void)
> diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
> index df9ef38..fc28162 100644
> --- a/include/linux/of_fdt.h
> +++ b/include/linux/of_fdt.h
> @@ -52,6 +52,8 @@ extern char __dtb_end[];
> extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
> int depth, void *data),
> void *data);
> +extern int of_get_flat_dt_subnode_by_name(unsigned long node,
> + const char *uname);
> extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,
> int *size);
> extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
> --
> 2.0.4
>
>
WARNING: multiple messages have this Message-ID (diff)
From: Stefano Stabellini <stefano.stabellini-mvvWK6WmYclDPfheJLI6IQ@public.gmane.org>
To: Shannon Zhao <zhaoshenglong-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org,
mark.rutland-5wv7dgnIgG8@public.gmane.org,
stefano.stabellini-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org,
david.vrabel-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org,
catalin.marinas-5wv7dgnIgG8@public.gmane.org,
will.deacon-5wv7dgnIgG8@public.gmane.org,
julien.grall-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org,
xen-devel-GuqFBffKawuEi8DpZVb4nw@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
ian.campbell-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org,
shannon.zhao-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org,
peter.huangpeng-hv44wF8Li93QT0dZR+AlfA@public.gmane.org,
Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Subject: Re: [PATCH v3 16/17] FDT: Add a helper to get specified name subnode
Date: Tue, 26 Jan 2016 12:11:24 +0000 [thread overview]
Message-ID: <alpine.DEB.2.02.1601261156340.3619@kaball.uk.xensource.com> (raw)
In-Reply-To: <1453519184-11908-17-git-send-email-zhaoshenglong-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
On Sat, 23 Jan 2016, Shannon Zhao wrote:
> From: Shannon Zhao <shannon.zhao-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
>
> Sometimes it needs to check if there is a node in FDT by full path.
> Introduce this helper to get the specified name subnode if it exists.
>
> Signed-off-by: Shannon Zhao <shannon.zhao-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> ---
> CC: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> ---
> drivers/of/fdt.c | 35 +++++++++++++++++++++++++++++++++++
> include/linux/of_fdt.h | 2 ++
> 2 files changed, 37 insertions(+)
>
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index 655f79d..112ec16 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -645,6 +645,41 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node,
> }
>
> /**
> + * of_get_flat_dt_subnode_by_name - get subnode of specified node by name
> + *
> + * @node: the parent node
> + * @uname: the name of subnode
> + * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none
> + */
> +
> +int of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname)
> +{
> + const void *blob = initial_boot_params;
> + int offset;
> + const char *pathp;
> +
> + /* Find first subnode if it exists */
> + offset = fdt_first_subnode(blob, node);
> + if (offset < 0)
> + return -FDT_ERR_NOTFOUND;
> + pathp = fdt_get_name(blob, offset, NULL);
> + if (strncmp(pathp, uname, strlen(uname)) == 0)
> + return offset;
Wouldn't this check succeed even if uname is "uefi" and the node
name is actually "uefiiiii"? You might have to use strcmp.
> + /* Find other subnodes */
> + do {
> + offset = fdt_next_subnode(blob, offset);
> + if (offset < 0)
> + return -FDT_ERR_NOTFOUND;
> + pathp = fdt_get_name(blob, offset, NULL);
> + if (strncmp(pathp, uname, strlen(uname)) == 0)
> + return offset;
> + } while (offset >= 0);
Rather than writing the name check twice, I think it would be best to
code this loop as:
for (offset = fdt_first_subnode(blob, offset);
offset >= 0;
offset = fdt_next_subnode(blob, offset)) {
/* do name check */
> + return -FDT_ERR_NOTFOUND;
> +}
> +
> +/**
> * of_get_flat_dt_root - find the root node in the flat blob
> */
> unsigned long __init of_get_flat_dt_root(void)
> diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
> index df9ef38..fc28162 100644
> --- a/include/linux/of_fdt.h
> +++ b/include/linux/of_fdt.h
> @@ -52,6 +52,8 @@ extern char __dtb_end[];
> extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
> int depth, void *data),
> void *data);
> +extern int of_get_flat_dt_subnode_by_name(unsigned long node,
> + const char *uname);
> extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,
> int *size);
> extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
> --
> 2.0.4
>
>
--
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WARNING: multiple messages have this Message-ID (diff)
From: stefano.stabellini@eu.citrix.com (Stefano Stabellini)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 16/17] FDT: Add a helper to get specified name subnode
Date: Tue, 26 Jan 2016 12:11:24 +0000 [thread overview]
Message-ID: <alpine.DEB.2.02.1601261156340.3619@kaball.uk.xensource.com> (raw)
In-Reply-To: <1453519184-11908-17-git-send-email-zhaoshenglong@huawei.com>
On Sat, 23 Jan 2016, Shannon Zhao wrote:
> From: Shannon Zhao <shannon.zhao@linaro.org>
>
> Sometimes it needs to check if there is a node in FDT by full path.
> Introduce this helper to get the specified name subnode if it exists.
>
> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> ---
> CC: Rob Herring <robh@kernel.org>
> ---
> drivers/of/fdt.c | 35 +++++++++++++++++++++++++++++++++++
> include/linux/of_fdt.h | 2 ++
> 2 files changed, 37 insertions(+)
>
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index 655f79d..112ec16 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -645,6 +645,41 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node,
> }
>
> /**
> + * of_get_flat_dt_subnode_by_name - get subnode of specified node by name
> + *
> + * @node: the parent node
> + * @uname: the name of subnode
> + * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none
> + */
> +
> +int of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname)
> +{
> + const void *blob = initial_boot_params;
> + int offset;
> + const char *pathp;
> +
> + /* Find first subnode if it exists */
> + offset = fdt_first_subnode(blob, node);
> + if (offset < 0)
> + return -FDT_ERR_NOTFOUND;
> + pathp = fdt_get_name(blob, offset, NULL);
> + if (strncmp(pathp, uname, strlen(uname)) == 0)
> + return offset;
Wouldn't this check succeed even if uname is "uefi" and the node
name is actually "uefiiiii"? You might have to use strcmp.
> + /* Find other subnodes */
> + do {
> + offset = fdt_next_subnode(blob, offset);
> + if (offset < 0)
> + return -FDT_ERR_NOTFOUND;
> + pathp = fdt_get_name(blob, offset, NULL);
> + if (strncmp(pathp, uname, strlen(uname)) == 0)
> + return offset;
> + } while (offset >= 0);
Rather than writing the name check twice, I think it would be best to
code this loop as:
for (offset = fdt_first_subnode(blob, offset);
offset >= 0;
offset = fdt_next_subnode(blob, offset)) {
/* do name check */
> + return -FDT_ERR_NOTFOUND;
> +}
> +
> +/**
> * of_get_flat_dt_root - find the root node in the flat blob
> */
> unsigned long __init of_get_flat_dt_root(void)
> diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
> index df9ef38..fc28162 100644
> --- a/include/linux/of_fdt.h
> +++ b/include/linux/of_fdt.h
> @@ -52,6 +52,8 @@ extern char __dtb_end[];
> extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
> int depth, void *data),
> void *data);
> +extern int of_get_flat_dt_subnode_by_name(unsigned long node,
> + const char *uname);
> extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,
> int *size);
> extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
> --
> 2.0.4
>
>
next prev parent reply other threads:[~2016-01-26 12:12 UTC|newest]
Thread overview: 144+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-23 3:19 [PATCH v3 00/17] Add ACPI support for Xen Dom0 on ARM64 Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` [PATCH v3 01/17] Xen: ACPI: Hide UART used by Xen Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-25 12:20 ` Stefano Stabellini
2016-01-25 12:20 ` Stefano Stabellini
2016-01-25 12:20 ` Stefano Stabellini
2016-01-25 12:20 ` Stefano Stabellini
2016-01-23 3:19 ` [PATCH v3 02/17] xen/grant-table: Move xlated_setup_gnttab_pages to common place Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` [PATCH v3 03/17] Xen: xlate: Use page_to_xen_pfn instead of page_to_pfn Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-25 13:55 ` Stefano Stabellini
2016-01-25 13:55 ` Stefano Stabellini
2016-01-25 13:55 ` Stefano Stabellini
2016-01-25 13:55 ` Stefano Stabellini
2016-01-23 3:19 ` [PATCH v3 04/17] arm/xen: Use xen_xlate_map_ballooned_pages to setup grant table Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` [PATCH v3 05/17] xen: memory : Add new XENMAPSPACE type XENMAPSPACE_dev_mmio Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` [PATCH v3 06/17] Xen: ARM: Add support for mapping platform device mmio Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` [PATCH v3 07/17] Xen: ARM: Add support for mapping AMBA " Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` [PATCH v3 08/17] Xen: public/hvm: sync changes of HVM_PARAM_CALLBACK_VIA ABI from Xen Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-25 15:06 ` Stefano Stabellini
2016-01-25 15:06 ` Stefano Stabellini
2016-01-25 15:06 ` Stefano Stabellini
2016-01-25 15:06 ` Stefano Stabellini
2016-01-23 3:19 ` [PATCH v3 09/17] xen/hvm/params: Add a new delivery type for event-channel in HVM_PARAM_CALLBACK_IRQ Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-25 15:08 ` Stefano Stabellini
2016-01-25 15:08 ` Stefano Stabellini
2016-01-25 15:08 ` Stefano Stabellini
2016-01-25 15:08 ` Stefano Stabellini
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` [PATCH v3 10/17] arm/xen: Get event-channel irq through HVM_PARAM when booting with ACPI Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-25 15:19 ` Stefano Stabellini
2016-01-25 15:19 ` Stefano Stabellini
2016-01-25 15:19 ` Stefano Stabellini
2016-01-25 15:19 ` Stefano Stabellini
2016-01-23 3:19 ` [PATCH v3 11/17] ARM: XEN: Move xen_early_init() before efi_init() Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-25 15:25 ` Stefano Stabellini
2016-01-25 15:25 ` Stefano Stabellini
2016-01-25 15:25 ` Stefano Stabellini
2016-01-25 15:25 ` Stefano Stabellini
2016-01-23 3:19 ` [PATCH v3 12/17] ARM64: ACPI: Check if it runs on Xen to enable or disable ACPI Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-25 15:32 ` Stefano Stabellini
2016-01-25 15:32 ` Stefano Stabellini
2016-01-25 15:32 ` Stefano Stabellini
2016-01-25 15:32 ` Stefano Stabellini
2016-01-27 8:27 ` Hanjun Guo
2016-01-27 8:27 ` Hanjun Guo
2016-01-27 8:57 ` Shannon Zhao
2016-01-27 8:57 ` Shannon Zhao
2016-01-27 8:57 ` Shannon Zhao
2016-01-27 8:57 ` Shannon Zhao
2016-01-27 8:27 ` Hanjun Guo
2016-01-23 3:19 ` [PATCH v3 13/17] ARM: Xen: Document UEFI support on Xen ARM virtual platforms Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-25 15:50 ` Stefano Stabellini
2016-01-25 15:50 ` Stefano Stabellini
2016-01-25 15:50 ` Stefano Stabellini
2016-01-25 15:59 ` Mark Rutland
2016-01-25 15:59 ` Mark Rutland
2016-01-25 15:59 ` Mark Rutland
2016-01-25 16:06 ` Stefano Stabellini
2016-01-25 16:06 ` Stefano Stabellini
2016-01-25 16:06 ` Stefano Stabellini
2016-01-25 16:06 ` Stefano Stabellini
2016-01-25 15:50 ` Stefano Stabellini
2016-01-23 3:19 ` [PATCH v3 14/17] XEN: EFI: Move x86 specific codes to architecture directory Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-25 16:44 ` Stefano Stabellini
2016-01-25 16:44 ` Stefano Stabellini
2016-01-25 16:44 ` Stefano Stabellini
2016-01-26 8:16 ` Shannon Zhao
2016-01-26 8:16 ` Shannon Zhao
2016-01-26 8:16 ` Shannon Zhao
2016-01-26 8:16 ` Shannon Zhao
2016-01-26 11:31 ` Stefano Stabellini
2016-01-26 11:31 ` Stefano Stabellini
2016-01-26 11:31 ` Stefano Stabellini
2016-01-26 12:26 ` Shannon Zhao
2016-01-26 12:26 ` Shannon Zhao
2016-01-26 12:26 ` Shannon Zhao
2016-01-26 12:26 ` Shannon Zhao
2016-01-26 11:31 ` Stefano Stabellini
2016-01-25 16:44 ` Stefano Stabellini
2016-01-23 3:19 ` [PATCH v3 15/17] ARM64: XEN: Add a function to initialize Xen specific UEFI runtime services Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-25 16:47 ` Stefano Stabellini
2016-01-25 16:47 ` Stefano Stabellini
2016-01-25 16:47 ` Stefano Stabellini
2016-01-25 16:47 ` Stefano Stabellini
2016-01-23 3:19 ` [PATCH v3 16/17] FDT: Add a helper to get specified name subnode Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-26 12:11 ` Stefano Stabellini [this message]
2016-01-26 12:11 ` Stefano Stabellini
2016-01-26 12:11 ` Stefano Stabellini
2016-01-26 12:27 ` Shannon Zhao
2016-01-26 12:27 ` Shannon Zhao
2016-01-26 12:27 ` Shannon Zhao
2016-01-26 12:27 ` Shannon Zhao
2016-01-26 12:11 ` Stefano Stabellini
2016-01-23 3:19 ` [PATCH v3 17/17] Xen: EFI: Parse DT parameters for Xen specific UEFI Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-23 3:19 ` Shannon Zhao
2016-01-26 11:41 ` Stefano Stabellini
2016-01-26 11:41 ` Stefano Stabellini
2016-01-26 11:41 ` Stefano Stabellini
2016-01-26 11:41 ` Stefano Stabellini
2016-01-26 12:05 ` Matt Fleming
2016-01-26 12:05 ` Matt Fleming
2016-01-26 12:05 ` Matt Fleming
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