Hello
I have some minor comments below
On 20/08/2016 00:32, Omer Khaliq wrote:
> The Cavium ThunderX SoC has a hardware random number generator.
> This driver provides support using the HWRNG framework.
>
> Signed-off-by: Omer Khaliq <okhaliq@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Ananth Jasty <Ananth.Jasty@xxxxxxxxxx>
> Acked-by: David Daney <david.daney@xxxxxxxxxx>
> ---
> drivers/char/hw_random/Kconfig | 13 +++++
> drivers/char/hw_random/Makefile | 1 +
> drivers/char/hw_random/cavium-rng-vf.c | 102 ++++++++++++++++++++++++++++++++
> drivers/char/hw_random/cavium-rng.c | 103 +++++++++++++++++++++++++++++++++
> 4 files changed, 219 insertions(+)
> create mode 100644 drivers/char/hw_random/cavium-rng-vf.c
> create mode 100644 drivers/char/hw_random/cavium-rng.c
>
> diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
> index 56ad5a5..fb9c7ad 100644
> --- a/drivers/char/hw_random/Kconfig
> +++ b/drivers/char/hw_random/Kconfig
> @@ -410,6 +410,19 @@ config HW_RANDOM_MESON
>
> If unsure, say Y.
>
> +config HW_RANDOM_CAVIUM
> + tristate "Cavium ThunderX Random Number Generator support"
> + depends on HW_RANDOM && PCI && (ARM64 || (COMPILE_TEST && 64BIT))
> + default HW_RANDOM
> + ---help---
> + This driver provides kernel-side support for the Random Number
> + Generator hardware found on Cavium SoCs.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called cavium_rng.
> +
> + If unsure, say Y.
> +
> endif # HW_RANDOM
>
> config UML_RANDOM
> diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
> index 04bb0b0..5f52b1e 100644
> --- a/drivers/char/hw_random/Makefile
> +++ b/drivers/char/hw_random/Makefile
> @@ -35,3 +35,4 @@ obj-$(CONFIG_HW_RANDOM_XGENE) += xgene-rng.o
> obj-$(CONFIG_HW_RANDOM_STM32) += stm32-rng.o
> obj-$(CONFIG_HW_RANDOM_PIC32) += pic32-rng.o
> obj-$(CONFIG_HW_RANDOM_MESON) += meson-rng.o
> +obj-$(CONFIG_HW_RANDOM_CAVIUM) += cavium-rng.o cavium-rng-vf.o
> diff --git a/drivers/char/hw_random/cavium-rng-vf.c b/drivers/char/hw_random/cavium-rng-vf.c
> new file mode 100644
> index 0000000..8e80bce
> --- /dev/null
> +++ b/drivers/char/hw_random/cavium-rng-vf.c
> @@ -0,0 +1,102 @@
> +/*
> + * Hardware Random Number Generator support for Cavium, Inc.
> + * Thunder processor family.
> + *
> + * This file is subject to the terms and conditions of the GNU General Public
> + * License. See the file "COPYING" in the main directory of this archive
> + * for more details.
> + *
> + * Copyright (C) 2016 Cavium, Inc.
> + */
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/device.h>
> +#include <linux/hw_random.h>
> +#include <linux/io.h>
> +#include <linux/pci_ids.h>
> +#include <linux/gfp.h>
> +#include <linux/pci.h>
> +#include <linux/init.h>
Please alphabetize headers, and check if there are necessary, clearly platform_device.h is unnecessary.
> +
> +struct cavium_rng {
> + struct hwrng ops;
> + void __iomem *result;
> +};
> +
> +/* Read data from the RNG unit */
> +static int cavium_rng_read(struct hwrng *rng, void *dat, size_t max, bool wait)
> +{
> + struct cavium_rng *p = container_of(rng, struct cavium_rng, ops);
> + unsigned int size = max;
> +
> + while (size >= 8) {
> + *((u64 *)dat) = readq(p->result);
> + size -= 8;
> + dat += 8;
> + }
> + while (size > 0) {
> + *((u8 *)dat) = readb(p->result);
> + size--;
> + dat++;
> + }
> + return max;
> +}
> +
> +/* Map Cavium RNG to an HWRNG object */
> +static int cavium_rng_probe_vf(struct pci_dev *pdev,
> + const struct pci_device_id *id)
> +{
> + struct cavium_rng *rng;
> + int ret;
> +
> + rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
> + if (!rng)
> + return -ENOMEM;
> +
> + /* Map the RNG result */
> + rng->result = pcim_iomap(pdev, 0, 0);
> + if (!rng->result) {
> + dev_err(&pdev->dev, "Error iomap failed retrieving result.\n");
> + return -ENOMEM;
> + }
> +
> + rng->ops.name = "cavium rng";
> + rng->ops.read = cavium_rng_read;
> + rng->ops.quality = 1000;
> +
> + pci_set_drvdata(pdev, rng);
> +
> + ret = hwrng_register(&rng->ops);
> + if (ret) {
> + dev_err(&pdev->dev, "Error registering device as HWRNG.\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +/* Remove the VF */
> +void cavium_rng_remove_vf(struct pci_dev *pdev)
> +{
> + struct cavium_rng *rng;
> +
> + rng = pci_get_drvdata(pdev);
> + hwrng_unregister(&rng->ops);
> +}
> +
> +static const struct pci_device_id cavium_rng_vf_id_table[] = {
> + { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa033), 0, 0, 0},
> + {0,},
> +};
> +MODULE_DEVICE_TABLE(pci, cavium_rng_vf_id_table);
> +
> +static struct pci_driver cavium_rng_vf_driver = {
> + .name = "cavium_rng_vf",
> + .id_table = cavium_rng_vf_id_table,
> + .probe = cavium_rng_probe_vf,
> + .remove = cavium_rng_remove_vf,
> +};
> +module_pci_driver(cavium_rng_vf_driver);
> +
> +MODULE_AUTHOR("Omer Khaliq");
You could add your email address.
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/char/hw_random/cavium-rng.c b/drivers/char/hw_random/cavium-rng.c
> new file mode 100644
> index 0000000..7f09ee4
> --- /dev/null
> +++ b/drivers/char/hw_random/cavium-rng.c
> @@ -0,0 +1,103 @@
> +/*
> + * Hardware Random Number Generator support for Cavium Inc.
> + * Thunder processor family.
> + *
> + * This file is subject to the terms and conditions of the GNU General Public
> + * License. See the file "COPYING" in the main directory of this archive
> + * for more details.
> + *
> + * Copyright (C) 2016 Cavium, Inc.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/device.h>
> +#include <linux/hw_random.h>
> +#include <linux/io.h>
> +#include <linux/pci_ids.h>
> +#include <linux/gfp.h>
> +#include <linux/pci.h>
> +#include <linux/init.h>
> +#include <linux/pci-ats.h>
Same comment for headers
> +
> +#define THUNDERX_RNM_ENT_EN 0x1
> +#define THUNDERX_RNM_RNG_EN 0x2
> +
> +struct cavium_rng_pf {
> + void __iomem *control_status;
> +};
> +
> +
Do you have run checkpatch.pl ?
No more than one blank line.
> +/* Enable the RNG hardware and activate the VF */
> +static int cavium_rng_probe(struct pci_dev *pdev,
> + const struct pci_device_id *id)
> +{
> + struct cavium_rng_pf *rng;
> + int iov_err;
> +
> +
Same problem
> + rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
> + if (!rng)
> + return -ENOMEM;
> +
> + /*Map the RNG control */
> + rng->control_status = pcim_iomap(pdev, 0, 0);
> + if (!rng->control_status) {
> + dev_err(&pdev->dev,
> + "Error iomap failed retrieving control_status.\n");
> + return -ENOMEM;
> + }
> +
> + /* Enable the RNG hardware and entropy source */
> + writeq(THUNDERX_RNM_RNG_EN | THUNDERX_RNM_ENT_EN,
> + rng->control_status);
> +
> + pci_set_drvdata(pdev, rng);
> +
> + /* Fix for improper link id reported for cn88XX */
> + if (pdev->subsystem_device == 0xa118)
> + pci_sriov_fdl_override(pdev, pdev->devfn);
> +
> + /* Enable the Cavium RNG as a VF */
> + iov_err = pci_enable_sriov(pdev, 1);
> + if (iov_err != 0) {
> + dev_err(&pdev->dev,
> + "Error initializing RNG virtual function,(%i).\n",
> + iov_err);
> + return iov_err;
You return without disabling the RNG
> + }
> +
> + return 0;
> +}
> +
> +/* Disable VF and RNG Hardware */
> +void cavium_rng_remove(struct pci_dev *pdev)
> +{
> + struct cavium_rng_pf *rng;
> +
> + rng = pci_get_drvdata(pdev);
> +
> + /* Remove the VF */
> + pci_disable_sriov(pdev);
> +
> + /* Disable the RNG hardware and entropy source */
> + writeq(0, rng->control_status);
> +}
> +
> +static const struct pci_device_id cavium_rng_pf_id_table[] = {
> + { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa018), 0, 0, 0}, /* Thunder RNM */
> + {0,},
> +};
> +
> +MODULE_DEVICE_TABLE(pci, cavium_rng_pf_id_table);
> +
> +static struct pci_driver cavium_rng_pf_driver = {
> + .name = "cavium_rng_pf",
> + .id_table = cavium_rng_pf_id_table,
> + .probe = cavium_rng_probe,
> + .remove = cavium_rng_remove,
> +};
> +
> +module_pci_driver(cavium_rng_pf_driver);
> +MODULE_AUTHOR("Omer Khaliq");
> +MODULE_LICENSE("GPL");
>
Regards
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