drivers/crypto/ccp/sp-pci.c - kernel/msm-5.4 - Gitiles

 /*
  * AMD Secure Processor device driver
  *
  * Copyright (C) 2013,2016 Advanced Micro Devices, Inc.
  *
  * Author: Tom Lendacky <thomas.lendacky@amd.com>
  * Author: Gary R Hook <gary.hook@amd.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/device.h>
 #include <linux/pci.h>
 #include <linux/pci_ids.h>
 #include <linux/dma-mapping.h>
 #include <linux/kthread.h>
 #include <linux/sched.h>
 #include <linux/interrupt.h>
 #include <linux/spinlock.h>
 #include <linux/delay.h>
 #include <linux/ccp.h>

 #include "ccp-dev.h"
 #include "psp-dev.h"

 #define MSIX_VECTORS			2

 struct sp_pci {
 	int msix_count;
 	struct msix_entry msix_entry[MSIX_VECTORS];
 };
 static struct sp_device *sp_dev_master;

 static int sp_get_msix_irqs(struct sp_device *sp)
 {
 	struct sp_pci *sp_pci = sp->dev_specific;
 	struct device *dev = sp->dev;
 	struct pci_dev *pdev = to_pci_dev(dev);
 	int v, ret;

 	for (v = 0; v < ARRAY_SIZE(sp_pci->msix_entry); v++)
 		sp_pci->msix_entry[v].entry = v;

 	ret = pci_enable_msix_range(pdev, sp_pci->msix_entry, 1, v);
 	if (ret < 0)
 		return ret;

 	sp_pci->msix_count = ret;
 	sp->use_tasklet = true;

 	sp->psp_irq = sp_pci->msix_entry[0].vector;
 	sp->ccp_irq = (sp_pci->msix_count > 1) ? sp_pci->msix_entry[1].vector
 					       : sp_pci->msix_entry[0].vector;
 	return 0;
 }

 static int sp_get_msi_irq(struct sp_device *sp)
 {
 	struct device *dev = sp->dev;
 	struct pci_dev *pdev = to_pci_dev(dev);
 	int ret;

 	ret = pci_enable_msi(pdev);
 	if (ret)
 		return ret;

 	sp->ccp_irq = pdev->irq;
 	sp->psp_irq = pdev->irq;

 	return 0;
 }

 static int sp_get_irqs(struct sp_device *sp)
 {
 	struct device *dev = sp->dev;
 	int ret;

 	ret = sp_get_msix_irqs(sp);
 	if (!ret)
 		return 0;

 	/* Couldn't get MSI-X vectors, try MSI */
 	dev_notice(dev, "could not enable MSI-X (%d), trying MSI\n", ret);
 	ret = sp_get_msi_irq(sp);
 	if (!ret)
 		return 0;

 	/* Couldn't get MSI interrupt */
 	dev_notice(dev, "could not enable MSI (%d)\n", ret);

 	return ret;
 }

 static void sp_free_irqs(struct sp_device *sp)
 {
 	struct sp_pci *sp_pci = sp->dev_specific;
 	struct device *dev = sp->dev;
 	struct pci_dev *pdev = to_pci_dev(dev);

 	if (sp_pci->msix_count)
 		pci_disable_msix(pdev);
 	else if (sp->psp_irq)
 		pci_disable_msi(pdev);

 	sp->ccp_irq = 0;
 	sp->psp_irq = 0;
 }

 static bool sp_pci_is_master(struct sp_device *sp)
 {
 	struct device *dev_cur, *dev_new;
 	struct pci_dev *pdev_cur, *pdev_new;

 	dev_new = sp->dev;
 	dev_cur = sp_dev_master->dev;

 	pdev_new = to_pci_dev(dev_new);
 	pdev_cur = to_pci_dev(dev_cur);

 	if (pdev_new->bus->number < pdev_cur->bus->number)
 		return true;

 	if (PCI_SLOT(pdev_new->devfn) < PCI_SLOT(pdev_cur->devfn))
 		return true;

 	if (PCI_FUNC(pdev_new->devfn) < PCI_FUNC(pdev_cur->devfn))
 		return true;

 	return false;
 }

 static void psp_set_master(struct sp_device *sp)
 {
 	if (!sp_dev_master) {
 		sp_dev_master = sp;
 		return;
 	}

 	if (sp_pci_is_master(sp))
 		sp_dev_master = sp;
 }

 static struct sp_device *psp_get_master(void)
 {
 	return sp_dev_master;
 }

 static int sp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct sp_device *sp;
 	struct sp_pci *sp_pci;
 	struct device *dev = &pdev->dev;
 	void __iomem * const *iomap_table;
 	int bar_mask;
 	int ret;

 	ret = -ENOMEM;
 	sp = sp_alloc_struct(dev);
 	if (!sp)
 		goto e_err;

 	sp_pci = devm_kzalloc(dev, sizeof(*sp_pci), GFP_KERNEL);
 	if (!sp_pci)
 		goto e_err;

 	sp->dev_specific = sp_pci;
 	sp->dev_vdata = (struct sp_dev_vdata *)id->driver_data;
 	if (!sp->dev_vdata) {
 		ret = -ENODEV;
 		dev_err(dev, "missing driver data\n");
 		goto e_err;
 	}

 	ret = pcim_enable_device(pdev);
 	if (ret) {
 		dev_err(dev, "pcim_enable_device failed (%d)\n", ret);
 		goto e_err;
 	}

 	bar_mask = pci_select_bars(pdev, IORESOURCE_MEM);
 	ret = pcim_iomap_regions(pdev, bar_mask, "ccp");
 	if (ret) {
 		dev_err(dev, "pcim_iomap_regions failed (%d)\n", ret);
 		goto e_err;
 	}

 	iomap_table = pcim_iomap_table(pdev);
 	if (!iomap_table) {
 		dev_err(dev, "pcim_iomap_table failed\n");
 		ret = -ENOMEM;
 		goto e_err;
 	}

 	sp->io_map = iomap_table[sp->dev_vdata->bar];
 	if (!sp->io_map) {
 		dev_err(dev, "ioremap failed\n");
 		ret = -ENOMEM;
 		goto e_err;
 	}

 	ret = sp_get_irqs(sp);
 	if (ret)
 		goto e_err;

 	pci_set_master(pdev);
 	sp->set_psp_master_device = psp_set_master;
 	sp->get_psp_master_device = psp_get_master;

 	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
 	if (ret) {
 		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 		if (ret) {
 			dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n",
 				ret);
 			goto e_err;
 		}
 	}

 	dev_set_drvdata(dev, sp);

 	ret = sp_init(sp);
 	if (ret)
 		goto e_err;

 	dev_notice(dev, "enabled\n");

 	return 0;

 e_err:
 	dev_notice(dev, "initialization failed\n");
 	return ret;
 }

 static void sp_pci_remove(struct pci_dev *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct sp_device *sp = dev_get_drvdata(dev);

 	if (!sp)
 		return;

 	sp_destroy(sp);

 	sp_free_irqs(sp);

 	dev_notice(dev, "disabled\n");
 }

 #ifdef CONFIG_PM
 static int sp_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 {
 	struct device *dev = &pdev->dev;
 	struct sp_device *sp = dev_get_drvdata(dev);

 	return sp_suspend(sp, state);
 }

 static int sp_pci_resume(struct pci_dev *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct sp_device *sp = dev_get_drvdata(dev);

 	return sp_resume(sp);
 }
 #endif

 #ifdef CONFIG_CRYPTO_DEV_SP_PSP
 static const struct psp_vdata psp_entry = {
 	.offset = 0x10500,
 };
 #endif

 static const struct sp_dev_vdata dev_vdata[] = {
 	{
 		.bar = 2,
 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
 		.ccp_vdata = &ccpv3,
 #endif
 	},
 	{
 		.bar = 2,
 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
 		.ccp_vdata = &ccpv5a,
 #endif
 #ifdef CONFIG_CRYPTO_DEV_SP_PSP
 		.psp_vdata = &psp_entry
 #endif
 	},
 	{
 		.bar = 2,
 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
 		.ccp_vdata = &ccpv5b,
 #endif
 	},
 };
 static const struct pci_device_id sp_pci_table[] = {
 	{ PCI_VDEVICE(AMD, 0x1537), (kernel_ulong_t)&dev_vdata[0] },
 	{ PCI_VDEVICE(AMD, 0x1456), (kernel_ulong_t)&dev_vdata[1] },
 	{ PCI_VDEVICE(AMD, 0x1468), (kernel_ulong_t)&dev_vdata[2] },
 	/* Last entry must be zero */
 	{ 0, }
 };
 MODULE_DEVICE_TABLE(pci, sp_pci_table);

 static struct pci_driver sp_pci_driver = {
 	.name = "ccp",
 	.id_table = sp_pci_table,
 	.probe = sp_pci_probe,
 	.remove = sp_pci_remove,
 #ifdef CONFIG_PM
 	.suspend = sp_pci_suspend,
 	.resume = sp_pci_resume,
 #endif
 };

 int sp_pci_init(void)
 {
 	return pci_register_driver(&sp_pci_driver);
 }

 void sp_pci_exit(void)
 {
 	pci_unregister_driver(&sp_pci_driver);
 }
	/*
	* AMD Secure Processor device driver
	*
	* Copyright (C) 2013,2016 Advanced Micro Devices, Inc.
	*
	* Author: Tom Lendacky <thomas.lendacky@amd.com>
	* Author: Gary R Hook <gary.hook@amd.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/device.h>
	#include <linux/pci.h>
	#include <linux/pci_ids.h>
	#include <linux/dma-mapping.h>
	#include <linux/kthread.h>
	#include <linux/sched.h>
	#include <linux/interrupt.h>
	#include <linux/spinlock.h>
	#include <linux/delay.h>
	#include <linux/ccp.h>

	#include "ccp-dev.h"
	#include "psp-dev.h"

	#define MSIX_VECTORS 2

	struct sp_pci {
	int msix_count;
	struct msix_entry msix_entry[MSIX_VECTORS];
	};
	static struct sp_device *sp_dev_master;

	static int sp_get_msix_irqs(struct sp_device *sp)
	{
	struct sp_pci *sp_pci = sp->dev_specific;
	struct device *dev = sp->dev;
	struct pci_dev *pdev = to_pci_dev(dev);
	int v, ret;

	for (v = 0; v < ARRAY_SIZE(sp_pci->msix_entry); v++)
	sp_pci->msix_entry[v].entry = v;

	ret = pci_enable_msix_range(pdev, sp_pci->msix_entry, 1, v);
	if (ret < 0)
	return ret;

	sp_pci->msix_count = ret;
	sp->use_tasklet = true;

	sp->psp_irq = sp_pci->msix_entry[0].vector;
	sp->ccp_irq = (sp_pci->msix_count > 1) ? sp_pci->msix_entry[1].vector
	: sp_pci->msix_entry[0].vector;
	return 0;
	}

	static int sp_get_msi_irq(struct sp_device *sp)
	{
	struct device *dev = sp->dev;
	struct pci_dev *pdev = to_pci_dev(dev);
	int ret;

	ret = pci_enable_msi(pdev);
	if (ret)
	return ret;

	sp->ccp_irq = pdev->irq;
	sp->psp_irq = pdev->irq;

	return 0;
	}

	static int sp_get_irqs(struct sp_device *sp)
	{
	struct device *dev = sp->dev;
	int ret;

	ret = sp_get_msix_irqs(sp);
	if (!ret)
	return 0;

	/* Couldn't get MSI-X vectors, try MSI */
	dev_notice(dev, "could not enable MSI-X (%d), trying MSI\n", ret);
	ret = sp_get_msi_irq(sp);
	if (!ret)
	return 0;

	/* Couldn't get MSI interrupt */
	dev_notice(dev, "could not enable MSI (%d)\n", ret);

	return ret;
	}

	static void sp_free_irqs(struct sp_device *sp)
	{
	struct sp_pci *sp_pci = sp->dev_specific;
	struct device *dev = sp->dev;
	struct pci_dev *pdev = to_pci_dev(dev);

	if (sp_pci->msix_count)
	pci_disable_msix(pdev);
	else if (sp->psp_irq)
	pci_disable_msi(pdev);

	sp->ccp_irq = 0;
	sp->psp_irq = 0;
	}

	static bool sp_pci_is_master(struct sp_device *sp)
	{
	struct device dev_cur, dev_new;
	struct pci_dev pdev_cur, pdev_new;

	dev_new = sp->dev;
	dev_cur = sp_dev_master->dev;

	pdev_new = to_pci_dev(dev_new);
	pdev_cur = to_pci_dev(dev_cur);

	if (pdev_new->bus->number < pdev_cur->bus->number)
	return true;

	if (PCI_SLOT(pdev_new->devfn) < PCI_SLOT(pdev_cur->devfn))
	return true;

	if (PCI_FUNC(pdev_new->devfn) < PCI_FUNC(pdev_cur->devfn))
	return true;

	return false;
	}

	static void psp_set_master(struct sp_device *sp)
	{
	if (!sp_dev_master) {
	sp_dev_master = sp;
	return;
	}

	if (sp_pci_is_master(sp))
	sp_dev_master = sp;
	}

	static struct sp_device *psp_get_master(void)
	{
	return sp_dev_master;
	}

	static int sp_pci_probe(struct pci_dev pdev, const struct pci_device_id id)
	{
	struct sp_device *sp;
	struct sp_pci *sp_pci;
	struct device *dev = &pdev->dev;
	void __iomem * const *iomap_table;
	int bar_mask;
	int ret;

	ret = -ENOMEM;
	sp = sp_alloc_struct(dev);
	if (!sp)
	goto e_err;

	sp_pci = devm_kzalloc(dev, sizeof(*sp_pci), GFP_KERNEL);
	if (!sp_pci)
	goto e_err;

	sp->dev_specific = sp_pci;
	sp->dev_vdata = (struct sp_dev_vdata *)id->driver_data;
	if (!sp->dev_vdata) {
	ret = -ENODEV;
	dev_err(dev, "missing driver data\n");
	goto e_err;
	}

	ret = pcim_enable_device(pdev);
	if (ret) {
	dev_err(dev, "pcim_enable_device failed (%d)\n", ret);
	goto e_err;
	}

	bar_mask = pci_select_bars(pdev, IORESOURCE_MEM);
	ret = pcim_iomap_regions(pdev, bar_mask, "ccp");
	if (ret) {
	dev_err(dev, "pcim_iomap_regions failed (%d)\n", ret);
	goto e_err;
	}

	iomap_table = pcim_iomap_table(pdev);
	if (!iomap_table) {
	dev_err(dev, "pcim_iomap_table failed\n");
	ret = -ENOMEM;
	goto e_err;
	}

	sp->io_map = iomap_table[sp->dev_vdata->bar];
	if (!sp->io_map) {
	dev_err(dev, "ioremap failed\n");
	ret = -ENOMEM;
	goto e_err;
	}

	ret = sp_get_irqs(sp);
	if (ret)
	goto e_err;

	pci_set_master(pdev);
	sp->set_psp_master_device = psp_set_master;
	sp->get_psp_master_device = psp_get_master;

	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
	if (ret) {
	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
	if (ret) {
	dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n",
	ret);
	goto e_err;
	}
	}

	dev_set_drvdata(dev, sp);

	ret = sp_init(sp);
	if (ret)
	goto e_err;

	dev_notice(dev, "enabled\n");

	return 0;

	e_err:
	dev_notice(dev, "initialization failed\n");
	return ret;
	}

	static void sp_pci_remove(struct pci_dev *pdev)
	{
	struct device *dev = &pdev->dev;
	struct sp_device *sp = dev_get_drvdata(dev);

	if (!sp)
	return;

	sp_destroy(sp);

	sp_free_irqs(sp);

	dev_notice(dev, "disabled\n");
	}

	#ifdef CONFIG_PM
	static int sp_pci_suspend(struct pci_dev *pdev, pm_message_t state)
	{
	struct device *dev = &pdev->dev;
	struct sp_device *sp = dev_get_drvdata(dev);

	return sp_suspend(sp, state);
	}

	static int sp_pci_resume(struct pci_dev *pdev)
	{
	struct device *dev = &pdev->dev;
	struct sp_device *sp = dev_get_drvdata(dev);

	return sp_resume(sp);
	}
	#endif

	#ifdef CONFIG_CRYPTO_DEV_SP_PSP
	static const struct psp_vdata psp_entry = {
	.offset = 0x10500,
	};
	#endif

	static const struct sp_dev_vdata dev_vdata[] = {
	{
	.bar = 2,
	#ifdef CONFIG_CRYPTO_DEV_SP_CCP
	.ccp_vdata = &ccpv3,
	#endif
	},
	{
	.bar = 2,
	#ifdef CONFIG_CRYPTO_DEV_SP_CCP
	.ccp_vdata = &ccpv5a,
	#endif
	#ifdef CONFIG_CRYPTO_DEV_SP_PSP
	.psp_vdata = &psp_entry
	#endif
	},
	{
	.bar = 2,
	#ifdef CONFIG_CRYPTO_DEV_SP_CCP
	.ccp_vdata = &ccpv5b,
	#endif
	},
	};
	static const struct pci_device_id sp_pci_table[] = {
	{ PCI_VDEVICE(AMD, 0x1537), (kernel_ulong_t)&dev_vdata[0] },
	{ PCI_VDEVICE(AMD, 0x1456), (kernel_ulong_t)&dev_vdata[1] },
	{ PCI_VDEVICE(AMD, 0x1468), (kernel_ulong_t)&dev_vdata[2] },
	/* Last entry must be zero */
	{ 0, }
	};
	MODULE_DEVICE_TABLE(pci, sp_pci_table);

	static struct pci_driver sp_pci_driver = {
	.name = "ccp",
	.id_table = sp_pci_table,
	.probe = sp_pci_probe,
	.remove = sp_pci_remove,
	#ifdef CONFIG_PM
	.suspend = sp_pci_suspend,
	.resume = sp_pci_resume,
	#endif
	};

	int sp_pci_init(void)
	{
	return pci_register_driver(&sp_pci_driver);
	}

	void sp_pci_exit(void)
	{
	pci_unregister_driver(&sp_pci_driver);
	}