329 lines
6.5 KiB
C
329 lines
6.5 KiB
C
/*
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* AMD Secure Processor device driver
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*
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* Copyright (C) 2013,2016 Advanced Micro Devices, Inc.
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*
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* Author: Tom Lendacky <thomas.lendacky@amd.com>
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* Author: Gary R Hook <gary.hook@amd.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/pci.h>
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#include <linux/pci_ids.h>
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#include <linux/dma-mapping.h>
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#include <linux/kthread.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/delay.h>
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#include <linux/ccp.h>
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#include "ccp-dev.h"
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#include "psp-dev.h"
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#define MSIX_VECTORS 2
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struct sp_pci {
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int msix_count;
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struct msix_entry msix_entry[MSIX_VECTORS];
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};
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static struct sp_device *sp_dev_master;
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static int sp_get_msix_irqs(struct sp_device *sp)
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{
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struct sp_pci *sp_pci = sp->dev_specific;
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struct device *dev = sp->dev;
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struct pci_dev *pdev = to_pci_dev(dev);
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int v, ret;
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for (v = 0; v < ARRAY_SIZE(sp_pci->msix_entry); v++)
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sp_pci->msix_entry[v].entry = v;
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ret = pci_enable_msix_range(pdev, sp_pci->msix_entry, 1, v);
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if (ret < 0)
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return ret;
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sp_pci->msix_count = ret;
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sp->use_tasklet = true;
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sp->psp_irq = sp_pci->msix_entry[0].vector;
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sp->ccp_irq = (sp_pci->msix_count > 1) ? sp_pci->msix_entry[1].vector
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: sp_pci->msix_entry[0].vector;
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return 0;
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}
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static int sp_get_msi_irq(struct sp_device *sp)
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{
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struct device *dev = sp->dev;
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struct pci_dev *pdev = to_pci_dev(dev);
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int ret;
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ret = pci_enable_msi(pdev);
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if (ret)
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return ret;
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sp->ccp_irq = pdev->irq;
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sp->psp_irq = pdev->irq;
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return 0;
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}
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static int sp_get_irqs(struct sp_device *sp)
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{
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struct device *dev = sp->dev;
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int ret;
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ret = sp_get_msix_irqs(sp);
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if (!ret)
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return 0;
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/* Couldn't get MSI-X vectors, try MSI */
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dev_notice(dev, "could not enable MSI-X (%d), trying MSI\n", ret);
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ret = sp_get_msi_irq(sp);
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if (!ret)
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return 0;
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/* Couldn't get MSI interrupt */
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dev_notice(dev, "could not enable MSI (%d)\n", ret);
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return ret;
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}
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static void sp_free_irqs(struct sp_device *sp)
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{
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struct sp_pci *sp_pci = sp->dev_specific;
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struct device *dev = sp->dev;
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struct pci_dev *pdev = to_pci_dev(dev);
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if (sp_pci->msix_count)
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pci_disable_msix(pdev);
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else if (sp->psp_irq)
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pci_disable_msi(pdev);
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sp->ccp_irq = 0;
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sp->psp_irq = 0;
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}
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static bool sp_pci_is_master(struct sp_device *sp)
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{
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struct device *dev_cur, *dev_new;
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struct pci_dev *pdev_cur, *pdev_new;
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dev_new = sp->dev;
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dev_cur = sp_dev_master->dev;
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pdev_new = to_pci_dev(dev_new);
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pdev_cur = to_pci_dev(dev_cur);
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if (pdev_new->bus->number < pdev_cur->bus->number)
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return true;
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if (PCI_SLOT(pdev_new->devfn) < PCI_SLOT(pdev_cur->devfn))
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return true;
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if (PCI_FUNC(pdev_new->devfn) < PCI_FUNC(pdev_cur->devfn))
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return true;
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return false;
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}
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static void psp_set_master(struct sp_device *sp)
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{
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if (!sp_dev_master) {
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sp_dev_master = sp;
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return;
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}
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if (sp_pci_is_master(sp))
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sp_dev_master = sp;
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}
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static struct sp_device *psp_get_master(void)
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{
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return sp_dev_master;
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}
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static int sp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
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{
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struct sp_device *sp;
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struct sp_pci *sp_pci;
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struct device *dev = &pdev->dev;
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void __iomem * const *iomap_table;
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int bar_mask;
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int ret;
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ret = -ENOMEM;
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sp = sp_alloc_struct(dev);
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if (!sp)
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goto e_err;
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sp_pci = devm_kzalloc(dev, sizeof(*sp_pci), GFP_KERNEL);
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if (!sp_pci)
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goto e_err;
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sp->dev_specific = sp_pci;
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sp->dev_vdata = (struct sp_dev_vdata *)id->driver_data;
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if (!sp->dev_vdata) {
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ret = -ENODEV;
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dev_err(dev, "missing driver data\n");
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goto e_err;
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}
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ret = pcim_enable_device(pdev);
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if (ret) {
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dev_err(dev, "pcim_enable_device failed (%d)\n", ret);
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goto e_err;
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}
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bar_mask = pci_select_bars(pdev, IORESOURCE_MEM);
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ret = pcim_iomap_regions(pdev, bar_mask, "ccp");
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if (ret) {
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dev_err(dev, "pcim_iomap_regions failed (%d)\n", ret);
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goto e_err;
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}
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iomap_table = pcim_iomap_table(pdev);
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if (!iomap_table) {
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dev_err(dev, "pcim_iomap_table failed\n");
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ret = -ENOMEM;
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goto e_err;
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}
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sp->io_map = iomap_table[sp->dev_vdata->bar];
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if (!sp->io_map) {
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dev_err(dev, "ioremap failed\n");
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ret = -ENOMEM;
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goto e_err;
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}
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ret = sp_get_irqs(sp);
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if (ret)
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goto e_err;
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pci_set_master(pdev);
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sp->set_psp_master_device = psp_set_master;
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sp->get_psp_master_device = psp_get_master;
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ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
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if (ret) {
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ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
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if (ret) {
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dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n",
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ret);
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goto e_err;
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}
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}
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dev_set_drvdata(dev, sp);
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ret = sp_init(sp);
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if (ret)
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goto e_err;
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dev_notice(dev, "enabled\n");
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return 0;
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e_err:
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dev_notice(dev, "initialization failed\n");
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return ret;
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}
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static void sp_pci_remove(struct pci_dev *pdev)
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{
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struct device *dev = &pdev->dev;
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struct sp_device *sp = dev_get_drvdata(dev);
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if (!sp)
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return;
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sp_destroy(sp);
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sp_free_irqs(sp);
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dev_notice(dev, "disabled\n");
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}
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#ifdef CONFIG_PM
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static int sp_pci_suspend(struct pci_dev *pdev, pm_message_t state)
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{
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struct device *dev = &pdev->dev;
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struct sp_device *sp = dev_get_drvdata(dev);
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return sp_suspend(sp, state);
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}
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static int sp_pci_resume(struct pci_dev *pdev)
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{
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struct device *dev = &pdev->dev;
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struct sp_device *sp = dev_get_drvdata(dev);
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return sp_resume(sp);
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}
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#endif
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#ifdef CONFIG_CRYPTO_DEV_SP_PSP
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static const struct psp_vdata psp_entry = {
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.offset = 0x10500,
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};
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#endif
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static const struct sp_dev_vdata dev_vdata[] = {
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{
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.bar = 2,
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#ifdef CONFIG_CRYPTO_DEV_SP_CCP
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.ccp_vdata = &ccpv3,
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#endif
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},
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{
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.bar = 2,
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#ifdef CONFIG_CRYPTO_DEV_SP_CCP
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.ccp_vdata = &ccpv5a,
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#endif
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#ifdef CONFIG_CRYPTO_DEV_SP_PSP
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.psp_vdata = &psp_entry
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#endif
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},
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{
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.bar = 2,
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#ifdef CONFIG_CRYPTO_DEV_SP_CCP
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.ccp_vdata = &ccpv5b,
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#endif
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},
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};
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static const struct pci_device_id sp_pci_table[] = {
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{ PCI_VDEVICE(AMD, 0x1537), (kernel_ulong_t)&dev_vdata[0] },
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{ PCI_VDEVICE(AMD, 0x1456), (kernel_ulong_t)&dev_vdata[1] },
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{ PCI_VDEVICE(AMD, 0x1468), (kernel_ulong_t)&dev_vdata[2] },
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/* Last entry must be zero */
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{ 0, }
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};
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MODULE_DEVICE_TABLE(pci, sp_pci_table);
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static struct pci_driver sp_pci_driver = {
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.name = "ccp",
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.id_table = sp_pci_table,
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.probe = sp_pci_probe,
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.remove = sp_pci_remove,
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#ifdef CONFIG_PM
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.suspend = sp_pci_suspend,
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.resume = sp_pci_resume,
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#endif
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};
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int sp_pci_init(void)
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{
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return pci_register_driver(&sp_pci_driver);
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}
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void sp_pci_exit(void)
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{
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pci_unregister_driver(&sp_pci_driver);
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}
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