drivers/crypto/ccp/ccp-pci.c - arm/linux-arm64-legacy - Git at Google

 /*
  * AMD Cryptographic Coprocessor (CCP) driver
  *
  * Copyright (C) 2013 Advanced Micro Devices, Inc.
  *
  * Author: Tom Lendacky <thomas.lendacky@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/pci.h>
 #include <linux/pci_ids.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"

 #define IO_BAR				2
 #define MSIX_VECTORS			2

 struct ccp_msix {
 	u32 vector;
 	char name[16];
 };

 struct ccp_pci {
 	int msix_count;
 	struct ccp_msix msix[MSIX_VECTORS];
 };

 static int ccp_get_msix_irqs(struct ccp_device *ccp)
 {
 	struct ccp_pci *ccp_pci = ccp->dev_specific;
 	struct device *dev = ccp->dev;
 	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
 	struct msix_entry msix_entry[MSIX_VECTORS];
 	unsigned int name_len = sizeof(ccp_pci->msix[0].name) - 1;
 	int v, ret;

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

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

 	ccp_pci->msix_count = ret;
 	for (v = 0; v < ccp_pci->msix_count; v++) {
 		/* Set the interrupt names and request the irqs */
 		snprintf(ccp_pci->msix[v].name, name_len, "ccp-%u", v);
 		ccp_pci->msix[v].vector = msix_entry[v].vector;
 		ret = request_irq(ccp_pci->msix[v].vector, ccp_irq_handler,
 				  0, ccp_pci->msix[v].name, dev);
 		if (ret) {
 			dev_notice(dev, "unable to allocate MSI-X IRQ (%d)\n",
 				   ret);
 			goto e_irq;
 		}
 	}

 	return 0;

 e_irq:
 	while (v--)
 		free_irq(ccp_pci->msix[v].vector, dev);

 	pci_disable_msix(pdev);

 	ccp_pci->msix_count = 0;

 	return ret;
 }

 static int ccp_get_msi_irq(struct ccp_device *ccp)
 {
 	struct device *dev = ccp->dev;
 	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
 	int ret;

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

 	ret = request_irq(pdev->irq, ccp_irq_handler, 0, "ccp", dev);
 	if (ret) {
 		dev_notice(dev, "unable to allocate MSI IRQ (%d)\n", ret);
 		goto e_msi;
 	}

 	return 0;

 e_msi:
 	pci_disable_msi(pdev);

 	return ret;
 }

 static int ccp_get_irqs(struct ccp_device *ccp)
 {
 	struct device *dev = ccp->dev;
 	int ret;

 	ret = ccp_get_msix_irqs(ccp);
 	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 = ccp_get_msi_irq(ccp);
 	if (!ret)
 		return 0;

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

 	return ret;
 }

 static void ccp_free_irqs(struct ccp_device *ccp)
 {
 	struct ccp_pci *ccp_pci = ccp->dev_specific;
 	struct device *dev = ccp->dev;
 	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);

 	if (ccp_pci->msix_count) {
 		while (ccp_pci->msix_count--)
 			free_irq(ccp_pci->msix[ccp_pci->msix_count].vector,
 				 dev);
 		pci_disable_msix(pdev);
 	} else {
 		free_irq(pdev->irq, dev);
 		pci_disable_msi(pdev);
 	}
 }

 static int ccp_find_mmio_area(struct ccp_device *ccp)
 {
 	struct device *dev = ccp->dev;
 	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
 	resource_size_t io_len;
 	unsigned long io_flags;
 	int bar;

 	io_flags = pci_resource_flags(pdev, IO_BAR);
 	io_len = pci_resource_len(pdev, IO_BAR);
 	if ((io_flags & IORESOURCE_MEM) && (io_len >= (IO_OFFSET + 0x800)))
 		return IO_BAR;

 	for (bar = 0; bar < PCI_STD_RESOURCE_END; bar++) {
 		io_flags = pci_resource_flags(pdev, bar);
 		io_len = pci_resource_len(pdev, bar);
 		if ((io_flags & IORESOURCE_MEM) &&
 		    (io_len >= (IO_OFFSET + 0x800)))
 			return bar;
 	}

 	return -EIO;
 }

 static int ccp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct ccp_device *ccp;
 	struct ccp_pci *ccp_pci;
 	struct device *dev = &pdev->dev;
 	unsigned int bar;
 	int ret;

 	ret = -ENOMEM;
 	ccp = ccp_alloc_struct(dev);
 	if (!ccp)
 		goto e_err;

 	ccp_pci = kzalloc(sizeof(*ccp_pci), GFP_KERNEL);
 	if (!ccp_pci) {
 		ret = -ENOMEM;
 		goto e_free1;
 	}
 	ccp->dev_specific = ccp_pci;
 	ccp->get_irq = ccp_get_irqs;
 	ccp->free_irq = ccp_free_irqs;

 	ret = pci_request_regions(pdev, "ccp");
 	if (ret) {
 		dev_err(dev, "pci_request_regions failed (%d)\n", ret);
 		goto e_free2;
 	}

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

 	pci_set_master(pdev);

 	ret = ccp_find_mmio_area(ccp);
 	if (ret < 0)
 		goto e_device;
 	bar = ret;

 	ret = -EIO;
 	ccp->io_map = pci_iomap(pdev, bar, 0);
 	if (ccp->io_map == NULL) {
 		dev_err(dev, "pci_iomap failed\n");
 		goto e_device;
 	}
 	ccp->io_regs = ccp->io_map + IO_OFFSET;

 	ret = dma_set_mask(dev, DMA_BIT_MASK(48));
 	if (ret == 0) {
 		ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(48));
 		if (ret) {
 			dev_err(dev,
 				"pci_set_consistent_dma_mask failed (%d)\n",
 				ret);
 			goto e_bar0;
 		}
 	} else {
 		ret = dma_set_mask(dev, DMA_BIT_MASK(32));
 		if (ret) {
 			dev_err(dev, "pci_set_dma_mask failed (%d)\n", ret);
 			goto e_bar0;
 		}
 	}

 	dev_set_drvdata(dev, ccp);

 	ret = ccp_init(ccp);
 	if (ret)
 		goto e_bar0;

 	dev_notice(dev, "enabled\n");

 	return 0;

 e_bar0:
 	pci_iounmap(pdev, ccp->io_map);

 e_device:
 	pci_disable_device(pdev);

 e_regions:
 	pci_release_regions(pdev);

 e_free2:
 	kfree(ccp_pci);

 e_free1:
 	kfree(ccp);

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

 static void ccp_pci_remove(struct pci_dev *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct ccp_device *ccp = dev_get_drvdata(dev);

 	if (!ccp)
 		return;

 	ccp_destroy(ccp);

 	pci_iounmap(pdev, ccp->io_map);

 	pci_disable_device(pdev);

 	pci_release_regions(pdev);

 	kfree(ccp);

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

 #ifdef CONFIG_PM
 static int ccp_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 {
 	struct device *dev = &pdev->dev;
 	struct ccp_device *ccp = dev_get_drvdata(dev);
 	unsigned long flags;
 	unsigned int i;

 	spin_lock_irqsave(&ccp->cmd_lock, flags);

 	ccp->suspending = 1;

 	/* Wake all the queue kthreads to prepare for suspend */
 	for (i = 0; i < ccp->cmd_q_count; i++)
 		wake_up_process(ccp->cmd_q[i].kthread);

 	spin_unlock_irqrestore(&ccp->cmd_lock, flags);

 	/* Wait for all queue kthreads to say they're done */
 	while (!ccp_queues_suspended(ccp))
 		wait_event_interruptible(ccp->suspend_queue,
 					 ccp_queues_suspended(ccp));

 	return 0;
 }

 static int ccp_pci_resume(struct pci_dev *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct ccp_device *ccp = dev_get_drvdata(dev);
 	unsigned long flags;
 	unsigned int i;

 	spin_lock_irqsave(&ccp->cmd_lock, flags);

 	ccp->suspending = 0;

 	/* Wake up all the kthreads */
 	for (i = 0; i < ccp->cmd_q_count; i++) {
 		ccp->cmd_q[i].suspended = 0;
 		wake_up_process(ccp->cmd_q[i].kthread);
 	}

 	spin_unlock_irqrestore(&ccp->cmd_lock, flags);

 	return 0;
 }
 #endif

 static DEFINE_PCI_DEVICE_TABLE(ccp_pci_table) = {
 	{ PCI_VDEVICE(AMD, 0x1537), },
 	/* Last entry must be zero */
 	{ 0, }
 };
 MODULE_DEVICE_TABLE(pci, ccp_pci_table);

 static struct pci_driver ccp_pci_driver = {
 	.name = "AMD Cryptographic Coprocessor",
 	.id_table = ccp_pci_table,
 	.probe = ccp_pci_probe,
 	.remove = ccp_pci_remove,
 #ifdef CONFIG_PM
 	.suspend = ccp_pci_suspend,
 	.resume = ccp_pci_resume,
 #endif
 };

 int ccp_pci_init(void)
 {
 	return pci_register_driver(&ccp_pci_driver);
 }

 void ccp_pci_exit(void)
 {
 	pci_unregister_driver(&ccp_pci_driver);
 }
	/*
	* AMD Cryptographic Coprocessor (CCP) driver
	*
	* Copyright (C) 2013 Advanced Micro Devices, Inc.
	*
	* Author: Tom Lendacky <thomas.lendacky@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/pci.h>
	#include <linux/pci_ids.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"

	#define IO_BAR 2
	#define MSIX_VECTORS 2

	struct ccp_msix {
	u32 vector;
	char name[16];
	};

	struct ccp_pci {
	int msix_count;
	struct ccp_msix msix[MSIX_VECTORS];
	};

	static int ccp_get_msix_irqs(struct ccp_device *ccp)
	{
	struct ccp_pci *ccp_pci = ccp->dev_specific;
	struct device *dev = ccp->dev;
	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
	struct msix_entry msix_entry[MSIX_VECTORS];
	unsigned int name_len = sizeof(ccp_pci->msix[0].name) - 1;
	int v, ret;

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

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

	ccp_pci->msix_count = ret;
	for (v = 0; v < ccp_pci->msix_count; v++) {
	/* Set the interrupt names and request the irqs */
	snprintf(ccp_pci->msix[v].name, name_len, "ccp-%u", v);
	ccp_pci->msix[v].vector = msix_entry[v].vector;
	ret = request_irq(ccp_pci->msix[v].vector, ccp_irq_handler,
	0, ccp_pci->msix[v].name, dev);
	if (ret) {
	dev_notice(dev, "unable to allocate MSI-X IRQ (%d)\n",
	ret);
	goto e_irq;
	}
	}

	return 0;

	e_irq:
	while (v--)
	free_irq(ccp_pci->msix[v].vector, dev);

	pci_disable_msix(pdev);

	ccp_pci->msix_count = 0;

	return ret;
	}

	static int ccp_get_msi_irq(struct ccp_device *ccp)
	{
	struct device *dev = ccp->dev;
	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
	int ret;

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

	ret = request_irq(pdev->irq, ccp_irq_handler, 0, "ccp", dev);
	if (ret) {
	dev_notice(dev, "unable to allocate MSI IRQ (%d)\n", ret);
	goto e_msi;
	}

	return 0;

	e_msi:
	pci_disable_msi(pdev);

	return ret;
	}

	static int ccp_get_irqs(struct ccp_device *ccp)
	{
	struct device *dev = ccp->dev;
	int ret;

	ret = ccp_get_msix_irqs(ccp);
	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 = ccp_get_msi_irq(ccp);
	if (!ret)
	return 0;

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

	return ret;
	}

	static void ccp_free_irqs(struct ccp_device *ccp)
	{
	struct ccp_pci *ccp_pci = ccp->dev_specific;
	struct device *dev = ccp->dev;
	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);

	if (ccp_pci->msix_count) {
	while (ccp_pci->msix_count--)
	free_irq(ccp_pci->msix[ccp_pci->msix_count].vector,
	dev);
	pci_disable_msix(pdev);
	} else {
	free_irq(pdev->irq, dev);
	pci_disable_msi(pdev);
	}
	}

	static int ccp_find_mmio_area(struct ccp_device *ccp)
	{
	struct device *dev = ccp->dev;
	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
	resource_size_t io_len;
	unsigned long io_flags;
	int bar;

	io_flags = pci_resource_flags(pdev, IO_BAR);
	io_len = pci_resource_len(pdev, IO_BAR);
	if ((io_flags & IORESOURCE_MEM) && (io_len >= (IO_OFFSET + 0x800)))
	return IO_BAR;

	for (bar = 0; bar < PCI_STD_RESOURCE_END; bar++) {
	io_flags = pci_resource_flags(pdev, bar);
	io_len = pci_resource_len(pdev, bar);
	if ((io_flags & IORESOURCE_MEM) &&
	(io_len >= (IO_OFFSET + 0x800)))
	return bar;
	}

	return -EIO;
	}

	static int ccp_pci_probe(struct pci_dev pdev, const struct pci_device_id id)
	{
	struct ccp_device *ccp;
	struct ccp_pci *ccp_pci;
	struct device *dev = &pdev->dev;
	unsigned int bar;
	int ret;

	ret = -ENOMEM;
	ccp = ccp_alloc_struct(dev);
	if (!ccp)
	goto e_err;

	ccp_pci = kzalloc(sizeof(*ccp_pci), GFP_KERNEL);
	if (!ccp_pci) {
	ret = -ENOMEM;
	goto e_free1;
	}
	ccp->dev_specific = ccp_pci;
	ccp->get_irq = ccp_get_irqs;
	ccp->free_irq = ccp_free_irqs;

	ret = pci_request_regions(pdev, "ccp");
	if (ret) {
	dev_err(dev, "pci_request_regions failed (%d)\n", ret);
	goto e_free2;
	}

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

	pci_set_master(pdev);

	ret = ccp_find_mmio_area(ccp);
	if (ret < 0)
	goto e_device;
	bar = ret;

	ret = -EIO;
	ccp->io_map = pci_iomap(pdev, bar, 0);
	if (ccp->io_map == NULL) {
	dev_err(dev, "pci_iomap failed\n");
	goto e_device;
	}
	ccp->io_regs = ccp->io_map + IO_OFFSET;

	ret = dma_set_mask(dev, DMA_BIT_MASK(48));
	if (ret == 0) {
	ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(48));
	if (ret) {
	dev_err(dev,
	"pci_set_consistent_dma_mask failed (%d)\n",
	ret);
	goto e_bar0;
	}
	} else {
	ret = dma_set_mask(dev, DMA_BIT_MASK(32));
	if (ret) {
	dev_err(dev, "pci_set_dma_mask failed (%d)\n", ret);
	goto e_bar0;
	}
	}

	dev_set_drvdata(dev, ccp);

	ret = ccp_init(ccp);
	if (ret)
	goto e_bar0;

	dev_notice(dev, "enabled\n");

	return 0;

	e_bar0:
	pci_iounmap(pdev, ccp->io_map);

	e_device:
	pci_disable_device(pdev);

	e_regions:
	pci_release_regions(pdev);

	e_free2:
	kfree(ccp_pci);

	e_free1:
	kfree(ccp);

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

	static void ccp_pci_remove(struct pci_dev *pdev)
	{
	struct device *dev = &pdev->dev;
	struct ccp_device *ccp = dev_get_drvdata(dev);

	if (!ccp)
	return;

	ccp_destroy(ccp);

	pci_iounmap(pdev, ccp->io_map);

	pci_disable_device(pdev);

	pci_release_regions(pdev);

	kfree(ccp);

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

	#ifdef CONFIG_PM
	static int ccp_pci_suspend(struct pci_dev *pdev, pm_message_t state)
	{
	struct device *dev = &pdev->dev;
	struct ccp_device *ccp = dev_get_drvdata(dev);
	unsigned long flags;
	unsigned int i;

	spin_lock_irqsave(&ccp->cmd_lock, flags);

	ccp->suspending = 1;

	/* Wake all the queue kthreads to prepare for suspend */
	for (i = 0; i < ccp->cmd_q_count; i++)
	wake_up_process(ccp->cmd_q[i].kthread);

	spin_unlock_irqrestore(&ccp->cmd_lock, flags);

	/* Wait for all queue kthreads to say they're done */
	while (!ccp_queues_suspended(ccp))
	wait_event_interruptible(ccp->suspend_queue,
	ccp_queues_suspended(ccp));

	return 0;
	}

	static int ccp_pci_resume(struct pci_dev *pdev)
	{
	struct device *dev = &pdev->dev;
	struct ccp_device *ccp = dev_get_drvdata(dev);
	unsigned long flags;
	unsigned int i;

	spin_lock_irqsave(&ccp->cmd_lock, flags);

	ccp->suspending = 0;

	/* Wake up all the kthreads */
	for (i = 0; i < ccp->cmd_q_count; i++) {
	ccp->cmd_q[i].suspended = 0;
	wake_up_process(ccp->cmd_q[i].kthread);
	}

	spin_unlock_irqrestore(&ccp->cmd_lock, flags);

	return 0;
	}
	#endif

	static DEFINE_PCI_DEVICE_TABLE(ccp_pci_table) = {
	{ PCI_VDEVICE(AMD, 0x1537), },
	/* Last entry must be zero */
	{ 0, }
	};
	MODULE_DEVICE_TABLE(pci, ccp_pci_table);

	static struct pci_driver ccp_pci_driver = {
	.name = "AMD Cryptographic Coprocessor",
	.id_table = ccp_pci_table,
	.probe = ccp_pci_probe,
	.remove = ccp_pci_remove,
	#ifdef CONFIG_PM
	.suspend = ccp_pci_suspend,
	.resume = ccp_pci_resume,
	#endif
	};

	int ccp_pci_init(void)
	{
	return pci_register_driver(&ccp_pci_driver);
	}

	void ccp_pci_exit(void)
	{
	pci_unregister_driver(&ccp_pci_driver);
	}