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From: Rob Herring <robh@kernel.org>
To: Russell King <linux@armlinux.org.uk>,
	James Morse <james.morse@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Guo Ren <guoren@kernel.org>,
	Jonas Bonn <jonas@southpole.se>,
	Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
	Stafford Horne <shorne@gmail.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
	Rich Felker <dalias@libc.org>,
	x86@kernel.org, Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Florian Fainelli <f.fainelli@gmail.com>,
	Ray Jui <rjui@broadcom.com>,
	Scott Branden <sbranden@broadcom.com>,
	bcm-kernel-feedback-list@broadcom.com,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Frank Rowand <frowand.list@gmail.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org,
	openrisc@lists.librecores.org, linuxppc-dev@lists.ozlabs.org,
	linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org,
	devicetree@vger.kernel.org
Subject: [PATCH 01/12] of: Add of_get_cpu_hwid() to read hardware ID from CPU nodes
Date: Wed,  6 Oct 2021 11:43:21 -0500	[thread overview]
Message-ID: <20211006164332.1981454-2-robh@kernel.org> (raw)
In-Reply-To: <20211006164332.1981454-1-robh@kernel.org>

There are various open coded implementions parsing the CPU node 'reg'
property which contains the CPU's hardware ID. Introduce a new function,
of_get_cpu_hwid(), to read the hardware ID.

All the callers should be DT only code, so no need for an empty
function.

Cc: Frank Rowand <frowand.list@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
 drivers/of/base.c  | 22 ++++++++++++++++++++++
 include/linux/of.h |  1 +
 2 files changed, 23 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index f720c0d246f2..e587ab44be22 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -286,6 +286,28 @@ const void *of_get_property(const struct device_node *np, const char *name,
 }
 EXPORT_SYMBOL(of_get_property);
 
+/**
+ * of_get_cpu_hwid - Get the hardware ID from a CPU device node
+ *
+ * @cpun: CPU number(logical index) for which device node is required
+ * @thread: The local thread number to get the hardware ID for.
+ *
+ * Return: The hardware ID for the CPU node or ~0ULL if not found.
+ */
+u64 of_get_cpu_hwid(struct device_node *cpun, unsigned int thread)
+{
+	const __be32 *cell;
+	int ac, len;
+
+	ac = of_n_addr_cells(cpun);
+	cell = of_get_property(cpun, "reg", &len);
+	if (!cell || !ac || ((sizeof(*cell) * ac * (thread + 1)) > len))
+		return ~0ULL;
+
+	cell += ac * thread;
+	return of_read_number(cell, ac);
+}
+
 /*
  * arch_match_cpu_phys_id - Match the given logical CPU and physical id
  *
diff --git a/include/linux/of.h b/include/linux/of.h
index 6f1c41f109bb..807f8168dad9 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -353,6 +353,7 @@ extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
 extern struct device_node *of_get_next_cpu_node(struct device_node *prev);
 extern struct device_node *of_get_cpu_state_node(struct device_node *cpu_node,
 						 int index);
+extern u64 of_get_cpu_hwid(struct device_node *cpun, unsigned int thread);
 
 #define for_each_property_of_node(dn, pp) \
 	for (pp = dn->properties; pp != NULL; pp = pp->next)
-- 
2.30.2


  reply	other threads:[~2021-10-06 16:43 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-06 16:43 [PATCH 00/12] DT: CPU h/w id parsing clean-ups and cacheinfo id support Rob Herring
2021-10-06 16:43 ` Rob Herring [this message]
2021-10-18 13:26   ` [PATCH 01/12] of: Add of_get_cpu_hwid() to read hardware ID from CPU nodes Sudeep Holla
2021-10-06 16:43 ` [PATCH 02/12] ARM: Use of_get_cpu_hwid() Rob Herring
2021-10-06 16:43 ` [PATCH 03/12] ARM: broadcom: " Rob Herring
2021-10-07  2:24   ` Florian Fainelli
2021-10-06 16:43 ` [PATCH 04/12] arm64: " Rob Herring
2021-10-07  8:07   ` Will Deacon
2021-10-18 13:27   ` Sudeep Holla
2021-10-06 16:43 ` [PATCH 05/12] csky: " Rob Herring
2021-10-06 16:43 ` [PATCH 06/12] openrisc: " Rob Herring
2021-10-06 20:44   ` Stafford Horne
2021-10-06 21:08     ` Rob Herring
2021-10-06 21:25       ` Stafford Horne
2021-10-06 21:27     ` Segher Boessenkool
2021-10-06 22:37       ` Stafford Horne
2021-10-07  7:53       ` David Laight
2021-10-06 16:43 ` [PATCH 07/12] powerpc: " Rob Herring
2021-10-08 11:01   ` Michael Ellerman
2021-10-06 16:43 ` [PATCH 08/12] riscv: " Rob Herring
2021-10-06 16:43 ` [PATCH 09/12] sh: " Rob Herring
2021-10-27 14:26   ` Rich Felker
2021-10-06 16:43 ` [PATCH 10/12] x86: dt: " Rob Herring
2021-10-06 16:43 ` [PATCH 11/12] cacheinfo: Allow for >32-bit cache 'id' Rob Herring
2021-10-18 13:30   ` Sudeep Holla
2021-10-06 16:43 ` [PATCH 12/12] cacheinfo: Set cache 'id' based on DT data Rob Herring
2021-10-18 13:31   ` Sudeep Holla
2021-10-07  2:24 ` [PATCH 00/12] DT: CPU h/w id parsing clean-ups and cacheinfo id support Florian Fainelli
2021-10-20 18:47 ` Rob Herring

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