87f3d0887c
Systems containing the Cavium HW RNG may have one device per NUMA node. A typical configuration is a 2-node NUMA system, which results in 2 RNG devices. The hwrng subsystem refuses (and rightly so) to register more than one device with he same name, so we get failure messages on these systems. Make the hwrng name unique by including the underlying device name. Also remove spaces from the name to make it possible to switch devices via the sysfs knobs. Signed-off-by: David Daney <david.daney@cavium.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
/*
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* Hardware Random Number Generator support for Cavium, Inc.
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* Thunder processor family.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2016 Cavium, Inc.
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*/
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#include <linux/hw_random.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/pci_ids.h>
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struct cavium_rng {
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struct hwrng ops;
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void __iomem *result;
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};
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/* Read data from the RNG unit */
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static int cavium_rng_read(struct hwrng *rng, void *dat, size_t max, bool wait)
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{
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struct cavium_rng *p = container_of(rng, struct cavium_rng, ops);
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unsigned int size = max;
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while (size >= 8) {
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*((u64 *)dat) = readq(p->result);
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size -= 8;
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dat += 8;
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}
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while (size > 0) {
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*((u8 *)dat) = readb(p->result);
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size--;
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dat++;
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}
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return max;
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}
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/* Map Cavium RNG to an HWRNG object */
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static int cavium_rng_probe_vf(struct pci_dev *pdev,
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const struct pci_device_id *id)
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{
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struct cavium_rng *rng;
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int ret;
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rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
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if (!rng)
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return -ENOMEM;
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/* Map the RNG result */
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rng->result = pcim_iomap(pdev, 0, 0);
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if (!rng->result) {
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dev_err(&pdev->dev, "Error iomap failed retrieving result.\n");
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return -ENOMEM;
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}
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rng->ops.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
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"cavium-rng-%s", dev_name(&pdev->dev));
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if (!rng->ops.name)
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return -ENOMEM;
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rng->ops.read = cavium_rng_read;
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rng->ops.quality = 1000;
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pci_set_drvdata(pdev, rng);
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ret = hwrng_register(&rng->ops);
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if (ret) {
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dev_err(&pdev->dev, "Error registering device as HWRNG.\n");
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return ret;
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}
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return 0;
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}
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/* Remove the VF */
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void cavium_rng_remove_vf(struct pci_dev *pdev)
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{
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struct cavium_rng *rng;
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rng = pci_get_drvdata(pdev);
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hwrng_unregister(&rng->ops);
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}
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static const struct pci_device_id cavium_rng_vf_id_table[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa033), 0, 0, 0},
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{0,},
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};
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MODULE_DEVICE_TABLE(pci, cavium_rng_vf_id_table);
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static struct pci_driver cavium_rng_vf_driver = {
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.name = "cavium_rng_vf",
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.id_table = cavium_rng_vf_id_table,
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.probe = cavium_rng_probe_vf,
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.remove = cavium_rng_remove_vf,
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};
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module_pci_driver(cavium_rng_vf_driver);
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MODULE_AUTHOR("Omer Khaliq <okhaliq@caviumnetworks.com>");
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MODULE_LICENSE("GPL");
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