From: Michael Ellerman <michael@ellerman.id.au>
To: <linux-kernel@vger.kernel.org>
Cc: tytso@mit.edu, herbert@gondor.apana.org.au, gleb@redhat.com,
agraf@suse.de, kvm-ppc@vger.kernel.org, linuxppc-dev@ozlabs.org,
Paul Mackerras <paulus@samba.org>,
kvm@vger.kernel.org, mpm@selenic.com, pbonzini@redhat.com
Subject: [PATCH 2/3] hwrng: Add a driver for the hwrng found in power7+ systems
Date: Thu, 26 Sep 2013 16:31:05 +1000 [thread overview]
Message-ID: <1380177066-3835-2-git-send-email-michael@ellerman.id.au> (raw)
In-Reply-To: <1380177066-3835-1-git-send-email-michael@ellerman.id.au>
Add a driver for the hwrng found in power7+ systems, based on the
existing code for the arch_get_random_long() hook.
We only register a single instance of the driver, not one per device,
because we use the existing per_cpu array of devices in the arch code.
This means we always read from the "closest" device, avoiding inter-chip
memory traffic.
Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
---
drivers/char/hw_random/Kconfig | 13 ++++++
drivers/char/hw_random/Makefile | 1 +
drivers/char/hw_random/powernv-rng.c | 81 ++++++++++++++++++++++++++++++++++++
3 files changed, 95 insertions(+)
create mode 100644 drivers/char/hw_random/powernv-rng.c
diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index 0aa9d91..c206de2 100644
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -290,6 +290,19 @@ config HW_RANDOM_PSERIES
If unsure, say Y.
+config HW_RANDOM_POWERNV
+ tristate "PowerNV Random Number Generator support"
+ depends on HW_RANDOM && PPC_POWERNV
+ default HW_RANDOM
+ ---help---
+ This is the driver for Random Number Generator hardware found
+ in POWER7+ and above machines for PowerNV platform.
+
+ To compile this driver as a module, choose M here: the
+ module will be called powernv-rng.
+
+ If unsure, say Y.
+
config HW_RANDOM_EXYNOS
tristate "EXYNOS HW random number generator support"
depends on HW_RANDOM && HAS_IOMEM && HAVE_CLK
diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
index bed467c..d7d2435 100644
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_HW_RANDOM_NOMADIK) += nomadik-rng.o
obj-$(CONFIG_HW_RANDOM_PICOXCELL) += picoxcell-rng.o
obj-$(CONFIG_HW_RANDOM_PPC4XX) += ppc4xx-rng.o
obj-$(CONFIG_HW_RANDOM_PSERIES) += pseries-rng.o
+obj-$(CONFIG_HW_RANDOM_POWERNV) += powernv-rng.o
obj-$(CONFIG_HW_RANDOM_EXYNOS) += exynos-rng.o
obj-$(CONFIG_HW_RANDOM_TPM) += tpm-rng.o
obj-$(CONFIG_HW_RANDOM_BCM2835) += bcm2835-rng.o
diff --git a/drivers/char/hw_random/powernv-rng.c b/drivers/char/hw_random/powernv-rng.c
new file mode 100644
index 0000000..e6965bf
--- /dev/null
+++ b/drivers/char/hw_random/powernv-rng.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2013 Michael Ellerman, Guo Chao, IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/random.h>
+#include <linux/hw_random.h>
+
+static int powernv_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
+{
+ unsigned long *buf;
+ int i, len;
+
+ /* We rely on rng_buffer_size() being >= sizeof(unsigned long) */
+ len = max / sizeof(unsigned long);
+
+ buf = (unsigned long *)data;
+
+ for (i = 0; i < len; i++)
+ powernv_get_random_long(buf++);
+
+ return len * sizeof(unsigned long);
+}
+
+static struct hwrng powernv_hwrng = {
+ .name = "powernv-rng",
+ .read = powernv_rng_read,
+};
+
+static int powernv_rng_remove(struct platform_device *pdev)
+{
+ hwrng_unregister(&powernv_hwrng);
+
+ return 0;
+}
+
+static int powernv_rng_probe(struct platform_device *pdev)
+{
+ int rc;
+
+ rc = hwrng_register(&powernv_hwrng);
+ if (rc) {
+ /* We only register one device, ignore any others */
+ if (rc == -EEXIST)
+ rc = -ENODEV;
+
+ return rc;
+ }
+
+ pr_info("registered powernv hwrng.\n");
+
+ return 0;
+}
+
+static struct of_device_id powernv_rng_match[] = {
+ { .compatible = "ibm,power-rng",},
+ {},
+};
+MODULE_DEVICE_TABLE(of, powernv_rng_match);
+
+static struct platform_driver powernv_rng_driver = {
+ .driver = {
+ .name = "powernv_rng",
+ .of_match_table = powernv_rng_match,
+ },
+ .probe = powernv_rng_probe,
+ .remove = powernv_rng_remove,
+};
+module_platform_driver(powernv_rng_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Bare metal HWRNG driver for POWER7+ and above");
--
1.8.1.2
next prev parent reply other threads:[~2013-09-26 6:31 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-26 6:31 [PATCH 1/3] powerpc: Implement arch_get_random_long/int() for powernv Michael Ellerman
2013-09-26 6:31 ` Michael Ellerman [this message]
2013-09-26 8:01 ` [PATCH 2/3] hwrng: Add a driver for the hwrng found in power7+ systems Benjamin Herrenschmidt
2013-10-01 8:25 ` Michael Ellerman
2013-09-26 6:31 ` [PATCH 3/3] KVM: PPC: Book3S: Add support for hwrng found on some powernv systems Michael Ellerman
2013-09-26 9:06 ` Paolo Bonzini
2013-10-01 8:34 ` Michael Ellerman
2013-10-01 8:39 ` Gleb Natapov
2013-10-01 9:23 ` Paul Mackerras
2013-10-01 9:57 ` Gleb Natapov
2013-10-01 10:00 ` Alexander Graf
2013-10-01 9:38 ` Benjamin Herrenschmidt
2013-10-01 11:19 ` Paolo Bonzini
2013-10-01 21:44 ` Benjamin Herrenschmidt
2013-10-02 8:38 ` Paolo Bonzini
2013-10-02 5:09 ` Paul Mackerras
2013-10-02 8:46 ` Paolo Bonzini
2013-10-02 9:06 ` Benjamin Herrenschmidt
2013-10-02 9:11 ` Alexander Graf
2013-10-02 9:50 ` Alexander Graf
2013-10-02 10:02 ` Gleb Natapov
2013-10-02 13:57 ` Michael Ellerman
2013-10-02 14:08 ` Alexander Graf
2013-10-02 14:33 ` Paolo Bonzini
2013-10-02 14:36 ` Alexander Graf
2013-10-02 14:38 ` Paolo Bonzini
2013-10-02 22:45 ` Paul Mackerras
2013-10-03 5:48 ` Gleb Natapov
2013-10-03 10:06 ` Paul Mackerras
2013-10-03 12:08 ` Gleb Natapov
2013-10-02 14:37 ` Gleb Natapov
2013-10-02 22:21 ` Benjamin Herrenschmidt
2013-10-03 6:08 ` Gleb Natapov
2013-10-02 22:13 ` Benjamin Herrenschmidt
2013-10-02 14:10 ` Gleb Natapov
2013-10-02 22:15 ` Benjamin Herrenschmidt
2013-10-02 22:02 ` Benjamin Herrenschmidt
2013-10-03 5:43 ` Gleb Natapov
2013-10-03 7:22 ` Benjamin Herrenschmidt
2013-10-02 22:07 ` Benjamin Herrenschmidt
2013-10-03 6:28 ` Gleb Natapov
2013-10-02 21:58 ` Benjamin Herrenschmidt
2013-10-01 9:58 ` Paolo Bonzini
2013-09-27 14:15 ` Anshuman Khandual
2013-10-01 8:36 ` Michael Ellerman
2013-09-26 7:58 ` [PATCH 1/3] powerpc: Implement arch_get_random_long/int() for powernv Benjamin Herrenschmidt
2013-10-11 3:07 Michael Ellerman
2013-10-11 3:07 ` [PATCH 2/3] hwrng: Add a driver for the hwrng found in power7+ systems Michael Ellerman
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