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SubjectRe: [Part2 PATCH v6 12/38] crypto: ccp: Add Platform Security Processor (PSP) device support
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On 10/19/2017 09:33 PM, Brijesh Singh wrote:
> The Platform Security Processor (PSP) is part of the AMD Secure
> Processor (AMD-SP) functionality. The PSP is a dedicated processor
> that provides support for key management commands in Secure Encrypted
> Virtualization (SEV) mode, along with software-based Trusted Execution
> Environment (TEE) to enable third-party trusted applications.
>
> Note that the key management functionality provided by the SEV firmware
> can be used outside of the kvm-amd driver hence it doesn't need to
> depend on CONFIG_KVM_AMD.
>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: "Radim Krčmář" <rkrcmar@redhat.com>
> Cc: Borislav Petkov <bp@suse.de>
> Cc: Herbert Xu <herbert@gondor.apana.org.au>
> Cc: Gary Hook <gary.hook@amd.com>
> Cc: Tom Lendacky <thomas.lendacky@amd.com>
> Cc: linux-crypto@vger.kernel.org
> Cc: kvm@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Improvements-by: Borislav Petkov <bp@suse.de>
> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
> Reviewed-by: Borislav Petkov <bp@suse.de>

Acked-by: Gary R Hook <gary.hook@amd.com>

> ---
> drivers/crypto/ccp/Kconfig | 11 +++++
> drivers/crypto/ccp/Makefile | 1 +
> drivers/crypto/ccp/psp-dev.c | 105 +++++++++++++++++++++++++++++++++++++++++++
> drivers/crypto/ccp/psp-dev.h | 59 ++++++++++++++++++++++++
> drivers/crypto/ccp/sp-dev.c | 26 +++++++++++
> drivers/crypto/ccp/sp-dev.h | 24 +++++++++-
> drivers/crypto/ccp/sp-pci.c | 52 +++++++++++++++++++++
> 7 files changed, 277 insertions(+), 1 deletion(-)
> create mode 100644 drivers/crypto/ccp/psp-dev.c
> create mode 100644 drivers/crypto/ccp/psp-dev.h
>
> diff --git a/drivers/crypto/ccp/Kconfig b/drivers/crypto/ccp/Kconfig
> index 9c84f9838931..b9dfae47aefd 100644
> --- a/drivers/crypto/ccp/Kconfig
> +++ b/drivers/crypto/ccp/Kconfig
> @@ -33,3 +33,14 @@ config CRYPTO_DEV_CCP_CRYPTO
> Support for using the cryptographic API with the AMD Cryptographic
> Coprocessor. This module supports offload of SHA and AES algorithms.
> If you choose 'M' here, this module will be called ccp_crypto.
> +
> +config CRYPTO_DEV_SP_PSP
> + bool "Platform Security Processor (PSP) device"
> + default y
> + depends on CRYPTO_DEV_CCP_DD && X86_64
> + help
> + Provide support for the AMD Platform Security Processor (PSP).
> + The PSP is a dedicated processor that provides support for key
> + management commands in Secure Encrypted Virtualization (SEV) mode,
> + along with software-based Trusted Execution Environment (TEE) to
> + enable third-party trusted applications.
> diff --git a/drivers/crypto/ccp/Makefile b/drivers/crypto/ccp/Makefile
> index 57f8debfcfb3..008bae7e26ec 100644
> --- a/drivers/crypto/ccp/Makefile
> +++ b/drivers/crypto/ccp/Makefile
> @@ -7,6 +7,7 @@ ccp-$(CONFIG_CRYPTO_DEV_SP_CCP) += ccp-dev.o \
> ccp-dmaengine.o \
> ccp-debugfs.o
> ccp-$(CONFIG_PCI) += sp-pci.o
> +ccp-$(CONFIG_CRYPTO_DEV_SP_PSP) += psp-dev.o
>
> obj-$(CONFIG_CRYPTO_DEV_CCP_CRYPTO) += ccp-crypto.o
> ccp-crypto-objs := ccp-crypto-main.o \
> diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
> new file mode 100644
> index 000000000000..b5789f878560
> --- /dev/null
> +++ b/drivers/crypto/ccp/psp-dev.c
> @@ -0,0 +1,105 @@
> +/*
> + * AMD Platform Security Processor (PSP) interface
> + *
> + * Copyright (C) 2016-2017 Advanced Micro Devices, Inc.
> + *
> + * Author: Brijesh Singh <brijesh.singh@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/kthread.h>
> +#include <linux/sched.h>
> +#include <linux/interrupt.h>
> +#include <linux/spinlock.h>
> +#include <linux/spinlock_types.h>
> +#include <linux/types.h>
> +#include <linux/mutex.h>
> +#include <linux/delay.h>
> +#include <linux/hw_random.h>
> +#include <linux/ccp.h>
> +
> +#include "sp-dev.h"
> +#include "psp-dev.h"
> +
> +static struct psp_device *psp_alloc_struct(struct sp_device *sp)
> +{
> + struct device *dev = sp->dev;
> + struct psp_device *psp;
> +
> + psp = devm_kzalloc(dev, sizeof(*psp), GFP_KERNEL);
> + if (!psp)
> + return NULL;
> +
> + psp->dev = dev;
> + psp->sp = sp;
> +
> + snprintf(psp->name, sizeof(psp->name), "psp-%u", sp->ord);
> +
> + return psp;
> +}
> +
> +static irqreturn_t psp_irq_handler(int irq, void *data)
> +{
> + return IRQ_HANDLED;
> +}
> +
> +int psp_dev_init(struct sp_device *sp)
> +{
> + struct device *dev = sp->dev;
> + struct psp_device *psp;
> + int ret;
> +
> + ret = -ENOMEM;
> + psp = psp_alloc_struct(sp);
> + if (!psp)
> + goto e_err;
> +
> + sp->psp_data = psp;
> +
> + psp->vdata = (struct psp_vdata *)sp->dev_vdata->psp_vdata;
> + if (!psp->vdata) {
> + ret = -ENODEV;
> + dev_err(dev, "missing driver data\n");
> + goto e_err;
> + }
> +
> + psp->io_regs = sp->io_map + psp->vdata->offset;
> +
> + /* Disable and clear interrupts until ready */
> + iowrite32(0, psp->io_regs + PSP_P2CMSG_INTEN);
> + iowrite32(-1, psp->io_regs + PSP_P2CMSG_INTSTS);
> +
> + /* Request an irq */
> + ret = sp_request_psp_irq(psp->sp, psp_irq_handler, psp->name, psp);
> + if (ret) {
> + dev_err(dev, "psp: unable to allocate an IRQ\n");
> + goto e_err;
> + }
> +
> + if (sp->set_psp_master_device)
> + sp->set_psp_master_device(sp);
> +
> + /* Enable interrupt */
> + iowrite32(-1, psp->io_regs + PSP_P2CMSG_INTEN);
> +
> + return 0;
> +
> +e_err:
> + sp->psp_data = NULL;
> +
> + dev_notice(dev, "psp initialization failed\n");
> +
> + return ret;
> +}
> +
> +void psp_dev_destroy(struct sp_device *sp)
> +{
> + struct psp_device *psp = sp->psp_data;
> +
> + sp_free_psp_irq(sp, psp);
> +}
> diff --git a/drivers/crypto/ccp/psp-dev.h b/drivers/crypto/ccp/psp-dev.h
> new file mode 100644
> index 000000000000..55b7808367c3
> --- /dev/null
> +++ b/drivers/crypto/ccp/psp-dev.h
> @@ -0,0 +1,59 @@
> +/*
> + * AMD Platform Security Processor (PSP) interface driver
> + *
> + * Copyright (C) 2017 Advanced Micro Devices, Inc.
> + *
> + * Author: Brijesh Singh <brijesh.singh@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.
> + */
> +
> +#ifndef __PSP_DEV_H__
> +#define __PSP_DEV_H__
> +
> +#include <linux/device.h>
> +#include <linux/pci.h>
> +#include <linux/spinlock.h>
> +#include <linux/mutex.h>
> +#include <linux/list.h>
> +#include <linux/wait.h>
> +#include <linux/dmapool.h>
> +#include <linux/hw_random.h>
> +#include <linux/bitops.h>
> +#include <linux/interrupt.h>
> +#include <linux/irqreturn.h>
> +#include <linux/dmaengine.h>
> +
> +#include "sp-dev.h"
> +
> +#define PSP_P2CMSG_INTEN 0x0110
> +#define PSP_P2CMSG_INTSTS 0x0114
> +
> +#define PSP_C2PMSG_ATTR_0 0x0118
> +#define PSP_C2PMSG_ATTR_1 0x011c
> +#define PSP_C2PMSG_ATTR_2 0x0120
> +#define PSP_C2PMSG_ATTR_3 0x0124
> +#define PSP_P2CMSG_ATTR_0 0x0128
> +
> +#define PSP_CMDRESP_CMD_SHIFT 16
> +#define PSP_CMDRESP_IOC BIT(0)
> +#define PSP_CMDRESP_RESP BIT(31)
> +#define PSP_CMDRESP_ERR_MASK 0xffff
> +
> +#define MAX_PSP_NAME_LEN 16
> +
> +struct psp_device {
> + struct list_head entry;
> +
> + struct psp_vdata *vdata;
> + char name[MAX_PSP_NAME_LEN];
> +
> + struct device *dev;
> + struct sp_device *sp;
> +
> + void __iomem *io_regs;
> +};
> +
> +#endif /* __PSP_DEV_H */
> diff --git a/drivers/crypto/ccp/sp-dev.c b/drivers/crypto/ccp/sp-dev.c
> index bef387c8abfd..cf101c039c8f 100644
> --- a/drivers/crypto/ccp/sp-dev.c
> +++ b/drivers/crypto/ccp/sp-dev.c
> @@ -198,6 +198,8 @@ int sp_init(struct sp_device *sp)
> if (sp->dev_vdata->ccp_vdata)
> ccp_dev_init(sp);
>
> + if (sp->dev_vdata->psp_vdata)
> + psp_dev_init(sp);
> return 0;
> }
>
> @@ -206,6 +208,9 @@ void sp_destroy(struct sp_device *sp)
> if (sp->dev_vdata->ccp_vdata)
> ccp_dev_destroy(sp);
>
> + if (sp->dev_vdata->psp_vdata)
> + psp_dev_destroy(sp);
> +
> sp_del_device(sp);
> }
>
> @@ -237,6 +242,27 @@ int sp_resume(struct sp_device *sp)
> }
> #endif
>
> +struct sp_device *sp_get_psp_master_device(void)
> +{
> + struct sp_device *i, *ret = NULL;
> + unsigned long flags;
> +
> + write_lock_irqsave(&sp_unit_lock, flags);
> + if (list_empty(&sp_units))
> + goto unlock;
> +
> + list_for_each_entry(i, &sp_units, entry) {
> + if (i->psp_data)
> + break;
> + }
> +
> + if (i->get_psp_master_device)
> + ret = i->get_psp_master_device();
> +unlock:
> + write_unlock_irqrestore(&sp_unit_lock, flags);
> + return ret;
> +}
> +
> static int __init sp_mod_init(void)
> {
> #ifdef CONFIG_X86
> diff --git a/drivers/crypto/ccp/sp-dev.h b/drivers/crypto/ccp/sp-dev.h
> index 5ab486ade1ad..909cf3e436b4 100644
> --- a/drivers/crypto/ccp/sp-dev.h
> +++ b/drivers/crypto/ccp/sp-dev.h
> @@ -42,12 +42,17 @@ struct ccp_vdata {
> const unsigned int offset;
> const unsigned int rsamax;
> };
> +
> +struct psp_vdata {
> + const unsigned int offset;
> +};
> +
> /* Structure to hold SP device data */
> struct sp_dev_vdata {
> const unsigned int bar;
>
> const struct ccp_vdata *ccp_vdata;
> - void *psp_vdata;
> + const struct psp_vdata *psp_vdata;
> };
>
> struct sp_device {
> @@ -68,6 +73,10 @@ struct sp_device {
> /* DMA caching attribute support */
> unsigned int axcache;
>
> + /* get and set master device */
> + struct sp_device*(*get_psp_master_device)(void);
> + void (*set_psp_master_device)(struct sp_device *);
> +
> bool irq_registered;
> bool use_tasklet;
>
> @@ -103,6 +112,7 @@ void sp_free_ccp_irq(struct sp_device *sp, void *data);
> int sp_request_psp_irq(struct sp_device *sp, irq_handler_t handler,
> const char *name, void *data);
> void sp_free_psp_irq(struct sp_device *sp, void *data);
> +struct sp_device *sp_get_psp_master_device(void);
>
> #ifdef CONFIG_CRYPTO_DEV_SP_CCP
>
> @@ -130,4 +140,16 @@ static inline int ccp_dev_resume(struct sp_device *sp)
> }
> #endif /* CONFIG_CRYPTO_DEV_SP_CCP */
>
> +#ifdef CONFIG_CRYPTO_DEV_SP_PSP
> +
> +int psp_dev_init(struct sp_device *sp);
> +void psp_dev_destroy(struct sp_device *sp);
> +
> +#else /* !CONFIG_CRYPTO_DEV_SP_PSP */
> +
> +static inline int psp_dev_init(struct sp_device *sp) { return 0; }
> +static inline void psp_dev_destroy(struct sp_device *sp) { }
> +
> +#endif /* CONFIG_CRYPTO_DEV_SP_PSP */
> +
> #endif
> diff --git a/drivers/crypto/ccp/sp-pci.c b/drivers/crypto/ccp/sp-pci.c
> index 9859aa683a28..f5f43c50698a 100644
> --- a/drivers/crypto/ccp/sp-pci.c
> +++ b/drivers/crypto/ccp/sp-pci.c
> @@ -25,6 +25,7 @@
> #include <linux/ccp.h>
>
> #include "ccp-dev.h"
> +#include "psp-dev.h"
>
> #define MSIX_VECTORS 2
>
> @@ -32,6 +33,7 @@ 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)
> {
> @@ -108,6 +110,45 @@ static void sp_free_irqs(struct sp_device *sp)
> 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;
> @@ -166,6 +207,8 @@ static int sp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> 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) {
> @@ -225,6 +268,12 @@ static int sp_pci_resume(struct pci_dev *pdev)
> }
> #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,
> @@ -237,6 +286,9 @@ static const struct sp_dev_vdata dev_vdata[] = {
> #ifdef CONFIG_CRYPTO_DEV_SP_CCP
> .ccp_vdata = &ccpv5a,
> #endif
> +#ifdef CONFIG_CRYPTO_DEV_SP_PSP
> + .psp_vdata = &psp_entry
> +#endif
> },
> {
> .bar = 2,
>

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