| Message ID | d090f123722d4392c5a36c66e510e1728eb2d4c4.1575438845.git.Rijo-john.Thomas@amd.com (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Herbert Xu |
| Headers | show |
| Series | Add TEE interface support to AMD Secure Processor driver | expand |
On 12/4/19 12:18 AM, Rijo Thomas wrote: > The PSP (Platform Security Processor) 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. > > Therefore, introduce psp-dev.c and psp-dev.h files, which can invoke > SEV (or TEE) initialization based on platform feature support. > > TEE interface support will be introduced in a later patch. > > Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> > Cc: Tom Lendacky <thomas.lendacky@amd.com> > Cc: Jens Wiklander <jens.wiklander@linaro.org> > Co-developed-by: Devaraj Rangasamy <Devaraj.Rangasamy@amd.com> > Signed-off-by: Devaraj Rangasamy <Devaraj.Rangasamy@amd.com> > Signed-off-by: Rijo Thomas <Rijo-john.Thomas@amd.com> Acked-by: Gary R Hook <gary.hook@amd.com> > --- > drivers/crypto/ccp/Makefile | 3 +- > drivers/crypto/ccp/psp-dev.c | 194 ++++++++++++++++++++++++++++++ > drivers/crypto/ccp/psp-dev.h | 52 +++++++++ > drivers/crypto/ccp/sev-dev.c | 273 ++++++++++++++++--------------------------- > drivers/crypto/ccp/sev-dev.h | 36 +++--- > drivers/crypto/ccp/sp-pci.c | 2 +- > 6 files changed, 367 insertions(+), 193 deletions(-) > create mode 100644 drivers/crypto/ccp/psp-dev.c > create mode 100644 drivers/crypto/ccp/psp-dev.h > > diff --git a/drivers/crypto/ccp/Makefile b/drivers/crypto/ccp/Makefile > index 9dafcf2..3b29ea4 100644 > --- a/drivers/crypto/ccp/Makefile > +++ b/drivers/crypto/ccp/Makefile > @@ -8,7 +8,8 @@ ccp-$(CONFIG_CRYPTO_DEV_SP_CCP) += ccp-dev.o \ > ccp-dmaengine.o > ccp-$(CONFIG_CRYPTO_DEV_CCP_DEBUGFS) += ccp-debugfs.o > ccp-$(CONFIG_PCI) += sp-pci.o > -ccp-$(CONFIG_CRYPTO_DEV_SP_PSP) += sev-dev.o > +ccp-$(CONFIG_CRYPTO_DEV_SP_PSP) += psp-dev.o \ > + sev-dev.o > > obj-$(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 0000000..2cd7a5e > --- /dev/null > +++ b/drivers/crypto/ccp/psp-dev.c > @@ -0,0 +1,194 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * AMD Platform Security Processor (PSP) interface > + * > + * Copyright (C) 2016,2019 Advanced Micro Devices, Inc. > + * > + * Author: Brijesh Singh <brijesh.singh@amd.com> > + */ > + > +#include <linux/kernel.h> > +#include <linux/irqreturn.h> > + > +#include "sp-dev.h" > +#include "psp-dev.h" > +#include "sev-dev.h" > + > +struct psp_device *psp_master; > + > +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) > +{ > + struct psp_device *psp = data; > + unsigned int status; > + > + /* Read the interrupt status: */ > + status = ioread32(psp->io_regs + psp->vdata->intsts_reg); > + > + /* invoke subdevice interrupt handlers */ > + if (status) { > + if (psp->sev_irq_handler) > + psp->sev_irq_handler(irq, psp->sev_irq_data, status); > + } > + > + /* Clear the interrupt status by writing the same value we read. */ > + iowrite32(status, psp->io_regs + psp->vdata->intsts_reg); > + > + return IRQ_HANDLED; > +} > + > +static int psp_check_sev_support(struct psp_device *psp) > +{ > + unsigned int val = ioread32(psp->io_regs + psp->vdata->feature_reg); > + > + /* > + * Check for a access to the registers. If this read returns > + * 0xffffffff, it's likely that the system is running a broken > + * BIOS which disallows access to the device. Stop here and > + * fail the PSP initialization (but not the load, as the CCP > + * could get properly initialized). > + */ > + if (val == 0xffffffff) { > + dev_notice(psp->dev, "psp: unable to access the device: you might be running a broken BIOS.\n"); > + return -ENODEV; > + } > + > + if (!(val & 1)) { > + /* Device does not support the SEV feature */ > + dev_dbg(psp->dev, "psp does not support SEV\n"); > + return -ENODEV; > + } > + > + return 0; > +} > + > +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; > + > + ret = psp_check_sev_support(psp); > + if (ret) > + goto e_disable; > + > + /* Disable and clear interrupts until ready */ > + iowrite32(0, psp->io_regs + psp->vdata->inten_reg); > + iowrite32(-1, psp->io_regs + psp->vdata->intsts_reg); > + > + /* 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; > + } > + > + ret = sev_dev_init(psp); > + if (ret) > + goto e_irq; > + > + if (sp->set_psp_master_device) > + sp->set_psp_master_device(sp); > + > + /* Enable interrupt */ > + iowrite32(-1, psp->io_regs + psp->vdata->inten_reg); > + > + dev_notice(dev, "psp enabled\n"); > + > + return 0; > + > +e_irq: > + sp_free_psp_irq(psp->sp, psp); > +e_err: > + sp->psp_data = NULL; > + > + dev_notice(dev, "psp initialization failed\n"); > + > + return ret; > + > +e_disable: > + sp->psp_data = NULL; > + > + return ret; > +} > + > +void psp_dev_destroy(struct sp_device *sp) > +{ > + struct psp_device *psp = sp->psp_data; > + > + if (!psp) > + return; > + > + sev_dev_destroy(psp); > + > + sp_free_psp_irq(sp, psp); > +} > + > +void psp_set_sev_irq_handler(struct psp_device *psp, psp_irq_handler_t handler, > + void *data) > +{ > + psp->sev_irq_data = data; > + psp->sev_irq_handler = handler; > +} > + > +void psp_clear_sev_irq_handler(struct psp_device *psp) > +{ > + psp_set_sev_irq_handler(psp, NULL, NULL); > +} > + > +struct psp_device *psp_get_master_device(void) > +{ > + struct sp_device *sp = sp_get_psp_master_device(); > + > + return sp ? sp->psp_data : NULL; > +} > + > +void psp_pci_init(void) > +{ > + psp_master = psp_get_master_device(); > + > + if (!psp_master) > + return; > + > + sev_pci_init(); > +} > + > +void psp_pci_exit(void) > +{ > + if (!psp_master) > + return; > + > + sev_pci_exit(); > +} > diff --git a/drivers/crypto/ccp/psp-dev.h b/drivers/crypto/ccp/psp-dev.h > new file mode 100644 > index 0000000..7c014ac > --- /dev/null > +++ b/drivers/crypto/ccp/psp-dev.h > @@ -0,0 +1,52 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/* > + * AMD Platform Security Processor (PSP) interface driver > + * > + * Copyright (C) 2017-2019 Advanced Micro Devices, Inc. > + * > + * Author: Brijesh Singh <brijesh.singh@amd.com> > + */ > + > +#ifndef __PSP_DEV_H__ > +#define __PSP_DEV_H__ > + > +#include <linux/device.h> > +#include <linux/list.h> > +#include <linux/bits.h> > +#include <linux/interrupt.h> > + > +#include "sp-dev.h" > + > +#define PSP_CMDRESP_RESP BIT(31) > +#define PSP_CMDRESP_ERR_MASK 0xffff > + > +#define MAX_PSP_NAME_LEN 16 > + > +extern struct psp_device *psp_master; > + > +typedef void (*psp_irq_handler_t)(int, void *, unsigned int); > + > +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; > + > + psp_irq_handler_t sev_irq_handler; > + void *sev_irq_data; > + > + void *sev_data; > +}; > + > +void psp_set_sev_irq_handler(struct psp_device *psp, psp_irq_handler_t handler, > + void *data); > +void psp_clear_sev_irq_handler(struct psp_device *psp); > + > +struct psp_device *psp_get_master_device(void); > + > +#endif /* __PSP_DEV_H */ > diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c > index 9a8c523..a608b52 100644 > --- a/drivers/crypto/ccp/sev-dev.c > +++ b/drivers/crypto/ccp/sev-dev.c > @@ -21,7 +21,7 @@ > #include <linux/ccp.h> > #include <linux/firmware.h> > > -#include "sp-dev.h" > +#include "psp-dev.h" > #include "sev-dev.h" > > #define DEVICE_NAME "sev" > @@ -30,7 +30,6 @@ > > static DEFINE_MUTEX(sev_cmd_mutex); > static struct sev_misc_dev *misc_dev; > -static struct psp_device *psp_master; > > static int psp_cmd_timeout = 100; > module_param(psp_cmd_timeout, int, 0644); > @@ -45,68 +44,45 @@ > > static inline bool sev_version_greater_or_equal(u8 maj, u8 min) > { > - if (psp_master->api_major > maj) > - return true; > - if (psp_master->api_major == maj && psp_master->api_minor >= min) > - return true; > - return false; > -} > - > -static struct psp_device *psp_alloc_struct(struct sp_device *sp) > -{ > - struct device *dev = sp->dev; > - struct psp_device *psp; > + struct sev_device *sev = psp_master->sev_data; > > - psp = devm_kzalloc(dev, sizeof(*psp), GFP_KERNEL); > - if (!psp) > - return NULL; > - > - psp->dev = dev; > - psp->sp = sp; > + if (sev->api_major > maj) > + return true; > > - snprintf(psp->name, sizeof(psp->name), "psp-%u", sp->ord); > + if (sev->api_major == maj && sev->api_minor >= min) > + return true; > > - return psp; > + return false; > } > > -static irqreturn_t psp_irq_handler(int irq, void *data) > +static void sev_irq_handler(int irq, void *data, unsigned int status) > { > - struct psp_device *psp = data; > - unsigned int status; > + struct sev_device *sev = data; > int reg; > > - /* Read the interrupt status: */ > - status = ioread32(psp->io_regs + psp->vdata->intsts_reg); > - > /* Check if it is command completion: */ > - if (!(status & PSP_CMD_COMPLETE)) > - goto done; > + if (!(status & SEV_CMD_COMPLETE)) > + return; > > /* Check if it is SEV command completion: */ > - reg = ioread32(psp->io_regs + psp->vdata->cmdresp_reg); > + reg = ioread32(sev->io_regs + sev->psp->vdata->cmdresp_reg); > if (reg & PSP_CMDRESP_RESP) { > - psp->sev_int_rcvd = 1; > - wake_up(&psp->sev_int_queue); > + sev->int_rcvd = 1; > + wake_up(&sev->int_queue); > } > - > -done: > - /* Clear the interrupt status by writing the same value we read. */ > - iowrite32(status, psp->io_regs + psp->vdata->intsts_reg); > - > - return IRQ_HANDLED; > } > > -static int sev_wait_cmd_ioc(struct psp_device *psp, > +static int sev_wait_cmd_ioc(struct sev_device *sev, > unsigned int *reg, unsigned int timeout) > { > int ret; > > - ret = wait_event_timeout(psp->sev_int_queue, > - psp->sev_int_rcvd, timeout * HZ); > + ret = wait_event_timeout(sev->int_queue, > + sev->int_rcvd, timeout * HZ); > if (!ret) > return -ETIMEDOUT; > > - *reg = ioread32(psp->io_regs + psp->vdata->cmdresp_reg); > + *reg = ioread32(sev->io_regs + sev->psp->vdata->cmdresp_reg); > > return 0; > } > @@ -150,42 +126,45 @@ static int sev_cmd_buffer_len(int cmd) > static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) > { > struct psp_device *psp = psp_master; > + struct sev_device *sev; > unsigned int phys_lsb, phys_msb; > unsigned int reg, ret = 0; > > - if (!psp) > + if (!psp || !psp->sev_data) > return -ENODEV; > > if (psp_dead) > return -EBUSY; > > + sev = psp->sev_data; > + > /* Get the physical address of the command buffer */ > phys_lsb = data ? lower_32_bits(__psp_pa(data)) : 0; > phys_msb = data ? upper_32_bits(__psp_pa(data)) : 0; > > - dev_dbg(psp->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n", > + dev_dbg(sev->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n", > cmd, phys_msb, phys_lsb, psp_timeout); > > print_hex_dump_debug("(in): ", DUMP_PREFIX_OFFSET, 16, 2, data, > sev_cmd_buffer_len(cmd), false); > > - iowrite32(phys_lsb, psp->io_regs + psp->vdata->cmdbuff_addr_lo_reg); > - iowrite32(phys_msb, psp->io_regs + psp->vdata->cmdbuff_addr_hi_reg); > + iowrite32(phys_lsb, sev->io_regs + psp->vdata->cmdbuff_addr_lo_reg); > + iowrite32(phys_msb, sev->io_regs + psp->vdata->cmdbuff_addr_hi_reg); > > - psp->sev_int_rcvd = 0; > + sev->int_rcvd = 0; > > reg = cmd; > - reg <<= PSP_CMDRESP_CMD_SHIFT; > - reg |= PSP_CMDRESP_IOC; > - iowrite32(reg, psp->io_regs + psp->vdata->cmdresp_reg); > + reg <<= SEV_CMDRESP_CMD_SHIFT; > + reg |= SEV_CMDRESP_IOC; > + iowrite32(reg, sev->io_regs + psp->vdata->cmdresp_reg); > > /* wait for command completion */ > - ret = sev_wait_cmd_ioc(psp, ®, psp_timeout); > + ret = sev_wait_cmd_ioc(sev, ®, psp_timeout); > if (ret) { > if (psp_ret) > *psp_ret = 0; > > - dev_err(psp->dev, "sev command %#x timed out, disabling PSP \n", cmd); > + dev_err(sev->dev, "sev command %#x timed out, disabling PSP\n", cmd); > psp_dead = true; > > return ret; > @@ -197,7 +176,7 @@ static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) > *psp_ret = reg & PSP_CMDRESP_ERR_MASK; > > if (reg & PSP_CMDRESP_ERR_MASK) { > - dev_dbg(psp->dev, "sev command %#x failed (%#010x)\n", > + dev_dbg(sev->dev, "sev command %#x failed (%#010x)\n", > cmd, reg & PSP_CMDRESP_ERR_MASK); > ret = -EIO; > } > @@ -222,20 +201,23 @@ static int sev_do_cmd(int cmd, void *data, int *psp_ret) > static int __sev_platform_init_locked(int *error) > { > struct psp_device *psp = psp_master; > + struct sev_device *sev; > int rc = 0; > > - if (!psp) > + if (!psp || !psp->sev_data) > return -ENODEV; > > - if (psp->sev_state == SEV_STATE_INIT) > + sev = psp->sev_data; > + > + if (sev->state == SEV_STATE_INIT) > return 0; > > - rc = __sev_do_cmd_locked(SEV_CMD_INIT, &psp->init_cmd_buf, error); > + rc = __sev_do_cmd_locked(SEV_CMD_INIT, &sev->init_cmd_buf, error); > if (rc) > return rc; > > - psp->sev_state = SEV_STATE_INIT; > - dev_dbg(psp->dev, "SEV firmware initialized\n"); > + sev->state = SEV_STATE_INIT; > + dev_dbg(sev->dev, "SEV firmware initialized\n"); > > return rc; > } > @@ -254,14 +236,15 @@ int sev_platform_init(int *error) > > static int __sev_platform_shutdown_locked(int *error) > { > + struct sev_device *sev = psp_master->sev_data; > int ret; > > ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error); > if (ret) > return ret; > > - psp_master->sev_state = SEV_STATE_UNINIT; > - dev_dbg(psp_master->dev, "SEV firmware shutdown\n"); > + sev->state = SEV_STATE_UNINIT; > + dev_dbg(sev->dev, "SEV firmware shutdown\n"); > > return ret; > } > @@ -279,14 +262,15 @@ static int sev_platform_shutdown(int *error) > > static int sev_get_platform_state(int *state, int *error) > { > + struct sev_device *sev = psp_master->sev_data; > int rc; > > rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, > - &psp_master->status_cmd_buf, error); > + &sev->status_cmd_buf, error); > if (rc) > return rc; > > - *state = psp_master->status_cmd_buf.state; > + *state = sev->status_cmd_buf.state; > return rc; > } > > @@ -324,7 +308,8 @@ static int sev_ioctl_do_reset(struct sev_issue_cmd *argp) > > static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp) > { > - struct sev_user_data_status *data = &psp_master->status_cmd_buf; > + struct sev_device *sev = psp_master->sev_data; > + struct sev_user_data_status *data = &sev->status_cmd_buf; > int ret; > > ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, data, &argp->error); > @@ -339,12 +324,13 @@ static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp) > > static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp) > { > + struct sev_device *sev = psp_master->sev_data; > int rc; > > if (!capable(CAP_SYS_ADMIN)) > return -EPERM; > > - if (psp_master->sev_state == SEV_STATE_UNINIT) { > + if (sev->state == SEV_STATE_UNINIT) { > rc = __sev_platform_init_locked(&argp->error); > if (rc) > return rc; > @@ -355,6 +341,7 @@ static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp) > > static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp) > { > + struct sev_device *sev = psp_master->sev_data; > struct sev_user_data_pek_csr input; > struct sev_data_pek_csr *data; > void *blob = NULL; > @@ -391,7 +378,7 @@ static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp) > data->len = input.length; > > cmd: > - if (psp_master->sev_state == SEV_STATE_UNINIT) { > + if (sev->state == SEV_STATE_UNINIT) { > ret = __sev_platform_init_locked(&argp->error); > if (ret) > goto e_free_blob; > @@ -434,21 +421,22 @@ void *psp_copy_user_blob(u64 __user uaddr, u32 len) > > static int sev_get_api_version(void) > { > + struct sev_device *sev = psp_master->sev_data; > struct sev_user_data_status *status; > int error = 0, ret; > > - status = &psp_master->status_cmd_buf; > + status = &sev->status_cmd_buf; > ret = sev_platform_status(status, &error); > if (ret) { > - dev_err(psp_master->dev, > + dev_err(sev->dev, > "SEV: failed to get status. Error: %#x\n", error); > return 1; > } > > - psp_master->api_major = status->api_major; > - psp_master->api_minor = status->api_minor; > - psp_master->build = status->build; > - psp_master->sev_state = status->state; > + sev->api_major = status->api_major; > + sev->api_minor = status->api_minor; > + sev->build = status->build; > + sev->state = status->state; > > return 0; > } > @@ -544,6 +532,7 @@ static int sev_update_firmware(struct device *dev) > > static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp) > { > + struct sev_device *sev = psp_master->sev_data; > struct sev_user_data_pek_cert_import input; > struct sev_data_pek_cert_import *data; > void *pek_blob, *oca_blob; > @@ -580,7 +569,7 @@ static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp) > data->oca_cert_len = input.oca_cert_len; > > /* If platform is not in INIT state then transition it to INIT */ > - if (psp_master->sev_state != SEV_STATE_INIT) { > + if (sev->state != SEV_STATE_INIT) { > ret = __sev_platform_init_locked(&argp->error); > if (ret) > goto e_free_oca; > @@ -702,13 +691,14 @@ static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp) > > static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp) > { > + struct sev_device *sev = psp_master->sev_data; > struct sev_user_data_pdh_cert_export input; > void *pdh_blob = NULL, *cert_blob = NULL; > struct sev_data_pdh_cert_export *data; > int ret; > > /* If platform is not in INIT state then transition it to INIT. */ > - if (psp_master->sev_state != SEV_STATE_INIT) { > + if (sev->state != SEV_STATE_INIT) { > if (!capable(CAP_SYS_ADMIN)) > return -EPERM; > > @@ -803,7 +793,7 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) > struct sev_issue_cmd input; > int ret = -EFAULT; > > - if (!psp_master) > + if (!psp_master || !psp_master->sev_data) > return -ENODEV; > > if (ioctl != SEV_ISSUE_CMD) > @@ -902,9 +892,9 @@ static void sev_exit(struct kref *ref) > misc_deregister(&misc_dev->misc); > } > > -static int sev_misc_init(struct psp_device *psp) > +static int sev_misc_init(struct sev_device *sev) > { > - struct device *dev = psp->dev; > + struct device *dev = sev->dev; > int ret; > > /* > @@ -935,115 +925,61 @@ static int sev_misc_init(struct psp_device *psp) > kref_get(&misc_dev->refcount); > } > > - init_waitqueue_head(&psp->sev_int_queue); > - psp->sev_misc = misc_dev; > + init_waitqueue_head(&sev->int_queue); > + sev->misc = misc_dev; > dev_dbg(dev, "registered SEV device\n"); > > return 0; > } > > -static int psp_check_sev_support(struct psp_device *psp) > -{ > - unsigned int val = ioread32(psp->io_regs + psp->vdata->feature_reg); > - > - /* > - * Check for a access to the registers. If this read returns > - * 0xffffffff, it's likely that the system is running a broken > - * BIOS which disallows access to the device. Stop here and > - * fail the PSP initialization (but not the load, as the CCP > - * could get properly initialized). > - */ > - if (val == 0xffffffff) { > - dev_notice(psp->dev, "psp: unable to access the device: you might be running a broken BIOS.\n"); > - return -ENODEV; > - } > - > - if (!(val & 1)) { > - /* Device does not support the SEV feature */ > - dev_dbg(psp->dev, "psp does not support SEV\n"); > - return -ENODEV; > - } > - > - return 0; > -} > - > -int psp_dev_init(struct sp_device *sp) > +int sev_dev_init(struct psp_device *psp) > { > - struct device *dev = sp->dev; > - struct psp_device *psp; > - int ret; > + struct device *dev = psp->dev; > + struct sev_device *sev; > + int ret = -ENOMEM; > > - ret = -ENOMEM; > - psp = psp_alloc_struct(sp); > - if (!psp) > + sev = devm_kzalloc(dev, sizeof(*sev), GFP_KERNEL); > + if (!sev) > goto e_err; > > - sp->psp_data = psp; > + psp->sev_data = sev; > > - 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; > - } > + sev->dev = dev; > + sev->psp = psp; > > - psp->io_regs = sp->io_map; > + sev->io_regs = psp->io_regs; > > - ret = psp_check_sev_support(psp); > - if (ret) > - goto e_disable; > + psp_set_sev_irq_handler(psp, sev_irq_handler, sev); > > - /* Disable and clear interrupts until ready */ > - iowrite32(0, psp->io_regs + psp->vdata->inten_reg); > - iowrite32(-1, psp->io_regs + psp->vdata->intsts_reg); > - > - /* 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; > - } > - > - ret = sev_misc_init(psp); > + ret = sev_misc_init(sev); > if (ret) > goto e_irq; > > - if (sp->set_psp_master_device) > - sp->set_psp_master_device(sp); > - > - /* Enable interrupt */ > - iowrite32(-1, psp->io_regs + psp->vdata->inten_reg); > - > - dev_notice(dev, "psp enabled\n"); > + dev_notice(dev, "sev enabled\n"); > > return 0; > > e_irq: > - sp_free_psp_irq(psp->sp, psp); > + psp_clear_sev_irq_handler(psp); > e_err: > - sp->psp_data = NULL; > + psp->sev_data = NULL; > > - dev_notice(dev, "psp initialization failed\n"); > - > - return ret; > - > -e_disable: > - sp->psp_data = NULL; > + dev_notice(dev, "sev initialization failed\n"); > > return ret; > } > > -void psp_dev_destroy(struct sp_device *sp) > +void sev_dev_destroy(struct psp_device *psp) > { > - struct psp_device *psp = sp->psp_data; > + struct sev_device *sev = psp->sev_data; > > - if (!psp) > + if (!sev) > return; > > - if (psp->sev_misc) > + if (sev->misc) > kref_put(&misc_dev->refcount, sev_exit); > > - sp_free_psp_irq(sp, psp); > + psp_clear_sev_irq_handler(psp); > } > > int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd, > @@ -1052,21 +988,18 @@ int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd, > if (!filep || filep->f_op != &sev_fops) > return -EBADF; > > - return sev_do_cmd(cmd, data, error); > + return sev_do_cmd(cmd, data, error); > } > EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user); > > -void psp_pci_init(void) > +void sev_pci_init(void) > { > - struct sp_device *sp; > + struct sev_device *sev = psp_master->sev_data; > int error, rc; > > - sp = sp_get_psp_master_device(); > - if (!sp) > + if (!sev) > return; > > - psp_master = sp->psp_data; > - > psp_timeout = psp_probe_timeout; > > if (sev_get_api_version()) > @@ -1082,13 +1015,13 @@ void psp_pci_init(void) > * firmware in INIT or WORKING state. > */ > > - if (psp_master->sev_state != SEV_STATE_UNINIT) { > + if (sev->state != SEV_STATE_UNINIT) { > sev_platform_shutdown(NULL); > - psp_master->sev_state = SEV_STATE_UNINIT; > + sev->state = SEV_STATE_UNINIT; > } > > if (sev_version_greater_or_equal(0, 15) && > - sev_update_firmware(psp_master->dev) == 0) > + sev_update_firmware(sev->dev) == 0) > sev_get_api_version(); > > /* Initialize the platform */ > @@ -1101,27 +1034,27 @@ void psp_pci_init(void) > * failed and persistent state has been erased. > * Retrying INIT command here should succeed. > */ > - dev_dbg(sp->dev, "SEV: retrying INIT command"); > + dev_dbg(sev->dev, "SEV: retrying INIT command"); > rc = sev_platform_init(&error); > } > > if (rc) { > - dev_err(sp->dev, "SEV: failed to INIT error %#x\n", error); > + dev_err(sev->dev, "SEV: failed to INIT error %#x\n", error); > return; > } > > - dev_info(sp->dev, "SEV API:%d.%d build:%d\n", psp_master->api_major, > - psp_master->api_minor, psp_master->build); > + dev_info(sev->dev, "SEV API:%d.%d build:%d\n", sev->api_major, > + sev->api_minor, sev->build); > > return; > > err: > - psp_master = NULL; > + psp_master->sev_data = NULL; > } > > -void psp_pci_exit(void) > +void sev_pci_exit(void) > { > - if (!psp_master) > + if (!psp_master->sev_data) > return; > > sev_platform_shutdown(NULL); > diff --git a/drivers/crypto/ccp/sev-dev.h b/drivers/crypto/ccp/sev-dev.h > index e861647..3d84ac3 100644 > --- a/drivers/crypto/ccp/sev-dev.h > +++ b/drivers/crypto/ccp/sev-dev.h > @@ -25,37 +25,25 @@ > #include <linux/miscdevice.h> > #include <linux/capability.h> > > -#include "sp-dev.h" > - > -#define PSP_CMD_COMPLETE BIT(1) > - > -#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 > +#define SEV_CMD_COMPLETE BIT(1) > +#define SEV_CMDRESP_CMD_SHIFT 16 > +#define SEV_CMDRESP_IOC BIT(0) > > struct sev_misc_dev { > struct kref refcount; > struct miscdevice misc; > }; > > -struct psp_device { > - struct list_head entry; > - > - struct psp_vdata *vdata; > - char name[MAX_PSP_NAME_LEN]; > - > +struct sev_device { > struct device *dev; > - struct sp_device *sp; > + struct psp_device *psp; > > void __iomem *io_regs; > > - int sev_state; > - unsigned int sev_int_rcvd; > - wait_queue_head_t sev_int_queue; > - struct sev_misc_dev *sev_misc; > + int state; > + unsigned int int_rcvd; > + wait_queue_head_t int_queue; > + struct sev_misc_dev *misc; > struct sev_user_data_status status_cmd_buf; > struct sev_data_init init_cmd_buf; > > @@ -64,4 +52,10 @@ struct psp_device { > u8 build; > }; > > +int sev_dev_init(struct psp_device *psp); > +void sev_dev_destroy(struct psp_device *psp); > + > +void sev_pci_init(void); > +void sev_pci_exit(void); > + > #endif /* __SEV_DEV_H */ > diff --git a/drivers/crypto/ccp/sp-pci.c b/drivers/crypto/ccp/sp-pci.c > index 473cf14..b29d2e6 100644 > --- a/drivers/crypto/ccp/sp-pci.c > +++ b/drivers/crypto/ccp/sp-pci.c > @@ -22,7 +22,7 @@ > #include <linux/ccp.h> > > #include "ccp-dev.h" > -#include "sev-dev.h" > +#include "psp-dev.h" > > #define MSIX_VECTORS 2 > >
diff --git a/drivers/crypto/ccp/Makefile b/drivers/crypto/ccp/Makefile index 9dafcf2..3b29ea4 100644 --- a/drivers/crypto/ccp/Makefile +++ b/drivers/crypto/ccp/Makefile @@ -8,7 +8,8 @@ ccp-$(CONFIG_CRYPTO_DEV_SP_CCP) += ccp-dev.o \ ccp-dmaengine.o ccp-$(CONFIG_CRYPTO_DEV_CCP_DEBUGFS) += ccp-debugfs.o ccp-$(CONFIG_PCI) += sp-pci.o -ccp-$(CONFIG_CRYPTO_DEV_SP_PSP) += sev-dev.o +ccp-$(CONFIG_CRYPTO_DEV_SP_PSP) += psp-dev.o \ + sev-dev.o obj-$(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 0000000..2cd7a5e --- /dev/null +++ b/drivers/crypto/ccp/psp-dev.c @@ -0,0 +1,194 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * AMD Platform Security Processor (PSP) interface + * + * Copyright (C) 2016,2019 Advanced Micro Devices, Inc. + * + * Author: Brijesh Singh <brijesh.singh@amd.com> + */ + +#include <linux/kernel.h> +#include <linux/irqreturn.h> + +#include "sp-dev.h" +#include "psp-dev.h" +#include "sev-dev.h" + +struct psp_device *psp_master; + +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) +{ + struct psp_device *psp = data; + unsigned int status; + + /* Read the interrupt status: */ + status = ioread32(psp->io_regs + psp->vdata->intsts_reg); + + /* invoke subdevice interrupt handlers */ + if (status) { + if (psp->sev_irq_handler) + psp->sev_irq_handler(irq, psp->sev_irq_data, status); + } + + /* Clear the interrupt status by writing the same value we read. */ + iowrite32(status, psp->io_regs + psp->vdata->intsts_reg); + + return IRQ_HANDLED; +} + +static int psp_check_sev_support(struct psp_device *psp) +{ + unsigned int val = ioread32(psp->io_regs + psp->vdata->feature_reg); + + /* + * Check for a access to the registers. If this read returns + * 0xffffffff, it's likely that the system is running a broken + * BIOS which disallows access to the device. Stop here and + * fail the PSP initialization (but not the load, as the CCP + * could get properly initialized). + */ + if (val == 0xffffffff) { + dev_notice(psp->dev, "psp: unable to access the device: you might be running a broken BIOS.\n"); + return -ENODEV; + } + + if (!(val & 1)) { + /* Device does not support the SEV feature */ + dev_dbg(psp->dev, "psp does not support SEV\n"); + return -ENODEV; + } + + return 0; +} + +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; + + ret = psp_check_sev_support(psp); + if (ret) + goto e_disable; + + /* Disable and clear interrupts until ready */ + iowrite32(0, psp->io_regs + psp->vdata->inten_reg); + iowrite32(-1, psp->io_regs + psp->vdata->intsts_reg); + + /* 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; + } + + ret = sev_dev_init(psp); + if (ret) + goto e_irq; + + if (sp->set_psp_master_device) + sp->set_psp_master_device(sp); + + /* Enable interrupt */ + iowrite32(-1, psp->io_regs + psp->vdata->inten_reg); + + dev_notice(dev, "psp enabled\n"); + + return 0; + +e_irq: + sp_free_psp_irq(psp->sp, psp); +e_err: + sp->psp_data = NULL; + + dev_notice(dev, "psp initialization failed\n"); + + return ret; + +e_disable: + sp->psp_data = NULL; + + return ret; +} + +void psp_dev_destroy(struct sp_device *sp) +{ + struct psp_device *psp = sp->psp_data; + + if (!psp) + return; + + sev_dev_destroy(psp); + + sp_free_psp_irq(sp, psp); +} + +void psp_set_sev_irq_handler(struct psp_device *psp, psp_irq_handler_t handler, + void *data) +{ + psp->sev_irq_data = data; + psp->sev_irq_handler = handler; +} + +void psp_clear_sev_irq_handler(struct psp_device *psp) +{ + psp_set_sev_irq_handler(psp, NULL, NULL); +} + +struct psp_device *psp_get_master_device(void) +{ + struct sp_device *sp = sp_get_psp_master_device(); + + return sp ? sp->psp_data : NULL; +} + +void psp_pci_init(void) +{ + psp_master = psp_get_master_device(); + + if (!psp_master) + return; + + sev_pci_init(); +} + +void psp_pci_exit(void) +{ + if (!psp_master) + return; + + sev_pci_exit(); +} diff --git a/drivers/crypto/ccp/psp-dev.h b/drivers/crypto/ccp/psp-dev.h new file mode 100644 index 0000000..7c014ac --- /dev/null +++ b/drivers/crypto/ccp/psp-dev.h @@ -0,0 +1,52 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * AMD Platform Security Processor (PSP) interface driver + * + * Copyright (C) 2017-2019 Advanced Micro Devices, Inc. + * + * Author: Brijesh Singh <brijesh.singh@amd.com> + */ + +#ifndef __PSP_DEV_H__ +#define __PSP_DEV_H__ + +#include <linux/device.h> +#include <linux/list.h> +#include <linux/bits.h> +#include <linux/interrupt.h> + +#include "sp-dev.h" + +#define PSP_CMDRESP_RESP BIT(31) +#define PSP_CMDRESP_ERR_MASK 0xffff + +#define MAX_PSP_NAME_LEN 16 + +extern struct psp_device *psp_master; + +typedef void (*psp_irq_handler_t)(int, void *, unsigned int); + +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; + + psp_irq_handler_t sev_irq_handler; + void *sev_irq_data; + + void *sev_data; +}; + +void psp_set_sev_irq_handler(struct psp_device *psp, psp_irq_handler_t handler, + void *data); +void psp_clear_sev_irq_handler(struct psp_device *psp); + +struct psp_device *psp_get_master_device(void); + +#endif /* __PSP_DEV_H */ diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 9a8c523..a608b52 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -21,7 +21,7 @@ #include <linux/ccp.h> #include <linux/firmware.h> -#include "sp-dev.h" +#include "psp-dev.h" #include "sev-dev.h" #define DEVICE_NAME "sev" @@ -30,7 +30,6 @@ static DEFINE_MUTEX(sev_cmd_mutex); static struct sev_misc_dev *misc_dev; -static struct psp_device *psp_master; static int psp_cmd_timeout = 100; module_param(psp_cmd_timeout, int, 0644); @@ -45,68 +44,45 @@ static inline bool sev_version_greater_or_equal(u8 maj, u8 min) { - if (psp_master->api_major > maj) - return true; - if (psp_master->api_major == maj && psp_master->api_minor >= min) - return true; - return false; -} - -static struct psp_device *psp_alloc_struct(struct sp_device *sp) -{ - struct device *dev = sp->dev; - struct psp_device *psp; + struct sev_device *sev = psp_master->sev_data; - psp = devm_kzalloc(dev, sizeof(*psp), GFP_KERNEL); - if (!psp) - return NULL; - - psp->dev = dev; - psp->sp = sp; + if (sev->api_major > maj) + return true; - snprintf(psp->name, sizeof(psp->name), "psp-%u", sp->ord); + if (sev->api_major == maj && sev->api_minor >= min) + return true; - return psp; + return false; } -static irqreturn_t psp_irq_handler(int irq, void *data) +static void sev_irq_handler(int irq, void *data, unsigned int status) { - struct psp_device *psp = data; - unsigned int status; + struct sev_device *sev = data; int reg; - /* Read the interrupt status: */ - status = ioread32(psp->io_regs + psp->vdata->intsts_reg); - /* Check if it is command completion: */ - if (!(status & PSP_CMD_COMPLETE)) - goto done; + if (!(status & SEV_CMD_COMPLETE)) + return; /* Check if it is SEV command completion: */ - reg = ioread32(psp->io_regs + psp->vdata->cmdresp_reg); + reg = ioread32(sev->io_regs + sev->psp->vdata->cmdresp_reg); if (reg & PSP_CMDRESP_RESP) { - psp->sev_int_rcvd = 1; - wake_up(&psp->sev_int_queue); + sev->int_rcvd = 1; + wake_up(&sev->int_queue); } - -done: - /* Clear the interrupt status by writing the same value we read. */ - iowrite32(status, psp->io_regs + psp->vdata->intsts_reg); - - return IRQ_HANDLED; } -static int sev_wait_cmd_ioc(struct psp_device *psp, +static int sev_wait_cmd_ioc(struct sev_device *sev, unsigned int *reg, unsigned int timeout) { int ret; - ret = wait_event_timeout(psp->sev_int_queue, - psp->sev_int_rcvd, timeout * HZ); + ret = wait_event_timeout(sev->int_queue, + sev->int_rcvd, timeout * HZ); if (!ret) return -ETIMEDOUT; - *reg = ioread32(psp->io_regs + psp->vdata->cmdresp_reg); + *reg = ioread32(sev->io_regs + sev->psp->vdata->cmdresp_reg); return 0; } @@ -150,42 +126,45 @@ static int sev_cmd_buffer_len(int cmd) static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) { struct psp_device *psp = psp_master; + struct sev_device *sev; unsigned int phys_lsb, phys_msb; unsigned int reg, ret = 0; - if (!psp) + if (!psp || !psp->sev_data) return -ENODEV; if (psp_dead) return -EBUSY; + sev = psp->sev_data; + /* Get the physical address of the command buffer */ phys_lsb = data ? lower_32_bits(__psp_pa(data)) : 0; phys_msb = data ? upper_32_bits(__psp_pa(data)) : 0; - dev_dbg(psp->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n", + dev_dbg(sev->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n", cmd, phys_msb, phys_lsb, psp_timeout); print_hex_dump_debug("(in): ", DUMP_PREFIX_OFFSET, 16, 2, data, sev_cmd_buffer_len(cmd), false); - iowrite32(phys_lsb, psp->io_regs + psp->vdata->cmdbuff_addr_lo_reg); - iowrite32(phys_msb, psp->io_regs + psp->vdata->cmdbuff_addr_hi_reg); + iowrite32(phys_lsb, sev->io_regs + psp->vdata->cmdbuff_addr_lo_reg); + iowrite32(phys_msb, sev->io_regs + psp->vdata->cmdbuff_addr_hi_reg); - psp->sev_int_rcvd = 0; + sev->int_rcvd = 0; reg = cmd; - reg <<= PSP_CMDRESP_CMD_SHIFT; - reg |= PSP_CMDRESP_IOC; - iowrite32(reg, psp->io_regs + psp->vdata->cmdresp_reg); + reg <<= SEV_CMDRESP_CMD_SHIFT; + reg |= SEV_CMDRESP_IOC; + iowrite32(reg, sev->io_regs + psp->vdata->cmdresp_reg); /* wait for command completion */ - ret = sev_wait_cmd_ioc(psp, ®, psp_timeout); + ret = sev_wait_cmd_ioc(sev, ®, psp_timeout); if (ret) { if (psp_ret) *psp_ret = 0; - dev_err(psp->dev, "sev command %#x timed out, disabling PSP \n", cmd); + dev_err(sev->dev, "sev command %#x timed out, disabling PSP\n", cmd); psp_dead = true; return ret; @@ -197,7 +176,7 @@ static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) *psp_ret = reg & PSP_CMDRESP_ERR_MASK; if (reg & PSP_CMDRESP_ERR_MASK) { - dev_dbg(psp->dev, "sev command %#x failed (%#010x)\n", + dev_dbg(sev->dev, "sev command %#x failed (%#010x)\n", cmd, reg & PSP_CMDRESP_ERR_MASK); ret = -EIO; } @@ -222,20 +201,23 @@ static int sev_do_cmd(int cmd, void *data, int *psp_ret) static int __sev_platform_init_locked(int *error) { struct psp_device *psp = psp_master; + struct sev_device *sev; int rc = 0; - if (!psp) + if (!psp || !psp->sev_data) return -ENODEV; - if (psp->sev_state == SEV_STATE_INIT) + sev = psp->sev_data; + + if (sev->state == SEV_STATE_INIT) return 0; - rc = __sev_do_cmd_locked(SEV_CMD_INIT, &psp->init_cmd_buf, error); + rc = __sev_do_cmd_locked(SEV_CMD_INIT, &sev->init_cmd_buf, error); if (rc) return rc; - psp->sev_state = SEV_STATE_INIT; - dev_dbg(psp->dev, "SEV firmware initialized\n"); + sev->state = SEV_STATE_INIT; + dev_dbg(sev->dev, "SEV firmware initialized\n"); return rc; } @@ -254,14 +236,15 @@ int sev_platform_init(int *error) static int __sev_platform_shutdown_locked(int *error) { + struct sev_device *sev = psp_master->sev_data; int ret; ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error); if (ret) return ret; - psp_master->sev_state = SEV_STATE_UNINIT; - dev_dbg(psp_master->dev, "SEV firmware shutdown\n"); + sev->state = SEV_STATE_UNINIT; + dev_dbg(sev->dev, "SEV firmware shutdown\n"); return ret; } @@ -279,14 +262,15 @@ static int sev_platform_shutdown(int *error) static int sev_get_platform_state(int *state, int *error) { + struct sev_device *sev = psp_master->sev_data; int rc; rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, - &psp_master->status_cmd_buf, error); + &sev->status_cmd_buf, error); if (rc) return rc; - *state = psp_master->status_cmd_buf.state; + *state = sev->status_cmd_buf.state; return rc; } @@ -324,7 +308,8 @@ static int sev_ioctl_do_reset(struct sev_issue_cmd *argp) static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp) { - struct sev_user_data_status *data = &psp_master->status_cmd_buf; + struct sev_device *sev = psp_master->sev_data; + struct sev_user_data_status *data = &sev->status_cmd_buf; int ret; ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, data, &argp->error); @@ -339,12 +324,13 @@ static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp) static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp) { + struct sev_device *sev = psp_master->sev_data; int rc; if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (psp_master->sev_state == SEV_STATE_UNINIT) { + if (sev->state == SEV_STATE_UNINIT) { rc = __sev_platform_init_locked(&argp->error); if (rc) return rc; @@ -355,6 +341,7 @@ static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp) static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp) { + struct sev_device *sev = psp_master->sev_data; struct sev_user_data_pek_csr input; struct sev_data_pek_csr *data; void *blob = NULL; @@ -391,7 +378,7 @@ static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp) data->len = input.length; cmd: - if (psp_master->sev_state == SEV_STATE_UNINIT) { + if (sev->state == SEV_STATE_UNINIT) { ret = __sev_platform_init_locked(&argp->error); if (ret) goto e_free_blob; @@ -434,21 +421,22 @@ void *psp_copy_user_blob(u64 __user uaddr, u32 len) static int sev_get_api_version(void) { + struct sev_device *sev = psp_master->sev_data; struct sev_user_data_status *status; int error = 0, ret; - status = &psp_master->status_cmd_buf; + status = &sev->status_cmd_buf; ret = sev_platform_status(status, &error); if (ret) { - dev_err(psp_master->dev, + dev_err(sev->dev, "SEV: failed to get status. Error: %#x\n", error); return 1; } - psp_master->api_major = status->api_major; - psp_master->api_minor = status->api_minor; - psp_master->build = status->build; - psp_master->sev_state = status->state; + sev->api_major = status->api_major; + sev->api_minor = status->api_minor; + sev->build = status->build; + sev->state = status->state; return 0; } @@ -544,6 +532,7 @@ static int sev_update_firmware(struct device *dev) static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp) { + struct sev_device *sev = psp_master->sev_data; struct sev_user_data_pek_cert_import input; struct sev_data_pek_cert_import *data; void *pek_blob, *oca_blob; @@ -580,7 +569,7 @@ static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp) data->oca_cert_len = input.oca_cert_len; /* If platform is not in INIT state then transition it to INIT */ - if (psp_master->sev_state != SEV_STATE_INIT) { + if (sev->state != SEV_STATE_INIT) { ret = __sev_platform_init_locked(&argp->error); if (ret) goto e_free_oca; @@ -702,13 +691,14 @@ static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp) static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp) { + struct sev_device *sev = psp_master->sev_data; struct sev_user_data_pdh_cert_export input; void *pdh_blob = NULL, *cert_blob = NULL; struct sev_data_pdh_cert_export *data; int ret; /* If platform is not in INIT state then transition it to INIT. */ - if (psp_master->sev_state != SEV_STATE_INIT) { + if (sev->state != SEV_STATE_INIT) { if (!capable(CAP_SYS_ADMIN)) return -EPERM; @@ -803,7 +793,7 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) struct sev_issue_cmd input; int ret = -EFAULT; - if (!psp_master) + if (!psp_master || !psp_master->sev_data) return -ENODEV; if (ioctl != SEV_ISSUE_CMD) @@ -902,9 +892,9 @@ static void sev_exit(struct kref *ref) misc_deregister(&misc_dev->misc); } -static int sev_misc_init(struct psp_device *psp) +static int sev_misc_init(struct sev_device *sev) { - struct device *dev = psp->dev; + struct device *dev = sev->dev; int ret; /* @@ -935,115 +925,61 @@ static int sev_misc_init(struct psp_device *psp) kref_get(&misc_dev->refcount); } - init_waitqueue_head(&psp->sev_int_queue); - psp->sev_misc = misc_dev; + init_waitqueue_head(&sev->int_queue); + sev->misc = misc_dev; dev_dbg(dev, "registered SEV device\n"); return 0; } -static int psp_check_sev_support(struct psp_device *psp) -{ - unsigned int val = ioread32(psp->io_regs + psp->vdata->feature_reg); - - /* - * Check for a access to the registers. If this read returns - * 0xffffffff, it's likely that the system is running a broken - * BIOS which disallows access to the device. Stop here and - * fail the PSP initialization (but not the load, as the CCP - * could get properly initialized). - */ - if (val == 0xffffffff) { - dev_notice(psp->dev, "psp: unable to access the device: you might be running a broken BIOS.\n"); - return -ENODEV; - } - - if (!(val & 1)) { - /* Device does not support the SEV feature */ - dev_dbg(psp->dev, "psp does not support SEV\n"); - return -ENODEV; - } - - return 0; -} - -int psp_dev_init(struct sp_device *sp) +int sev_dev_init(struct psp_device *psp) { - struct device *dev = sp->dev; - struct psp_device *psp; - int ret; + struct device *dev = psp->dev; + struct sev_device *sev; + int ret = -ENOMEM; - ret = -ENOMEM; - psp = psp_alloc_struct(sp); - if (!psp) + sev = devm_kzalloc(dev, sizeof(*sev), GFP_KERNEL); + if (!sev) goto e_err; - sp->psp_data = psp; + psp->sev_data = sev; - 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; - } + sev->dev = dev; + sev->psp = psp; - psp->io_regs = sp->io_map; + sev->io_regs = psp->io_regs; - ret = psp_check_sev_support(psp); - if (ret) - goto e_disable; + psp_set_sev_irq_handler(psp, sev_irq_handler, sev); - /* Disable and clear interrupts until ready */ - iowrite32(0, psp->io_regs + psp->vdata->inten_reg); - iowrite32(-1, psp->io_regs + psp->vdata->intsts_reg); - - /* 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; - } - - ret = sev_misc_init(psp); + ret = sev_misc_init(sev); if (ret) goto e_irq; - if (sp->set_psp_master_device) - sp->set_psp_master_device(sp); - - /* Enable interrupt */ - iowrite32(-1, psp->io_regs + psp->vdata->inten_reg); - - dev_notice(dev, "psp enabled\n"); + dev_notice(dev, "sev enabled\n"); return 0; e_irq: - sp_free_psp_irq(psp->sp, psp); + psp_clear_sev_irq_handler(psp); e_err: - sp->psp_data = NULL; + psp->sev_data = NULL; - dev_notice(dev, "psp initialization failed\n"); - - return ret; - -e_disable: - sp->psp_data = NULL; + dev_notice(dev, "sev initialization failed\n"); return ret; } -void psp_dev_destroy(struct sp_device *sp) +void sev_dev_destroy(struct psp_device *psp) { - struct psp_device *psp = sp->psp_data; + struct sev_device *sev = psp->sev_data; - if (!psp) + if (!sev) return; - if (psp->sev_misc) + if (sev->misc) kref_put(&misc_dev->refcount, sev_exit); - sp_free_psp_irq(sp, psp); + psp_clear_sev_irq_handler(psp); } int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd, @@ -1052,21 +988,18 @@ int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd, if (!filep || filep->f_op != &sev_fops) return -EBADF; - return sev_do_cmd(cmd, data, error); + return sev_do_cmd(cmd, data, error); } EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user); -void psp_pci_init(void) +void sev_pci_init(void) { - struct sp_device *sp; + struct sev_device *sev = psp_master->sev_data; int error, rc; - sp = sp_get_psp_master_device(); - if (!sp) + if (!sev) return; - psp_master = sp->psp_data; - psp_timeout = psp_probe_timeout; if (sev_get_api_version()) @@ -1082,13 +1015,13 @@ void psp_pci_init(void) * firmware in INIT or WORKING state. */ - if (psp_master->sev_state != SEV_STATE_UNINIT) { + if (sev->state != SEV_STATE_UNINIT) { sev_platform_shutdown(NULL); - psp_master->sev_state = SEV_STATE_UNINIT; + sev->state = SEV_STATE_UNINIT; } if (sev_version_greater_or_equal(0, 15) && - sev_update_firmware(psp_master->dev) == 0) + sev_update_firmware(sev->dev) == 0) sev_get_api_version(); /* Initialize the platform */ @@ -1101,27 +1034,27 @@ void psp_pci_init(void) * failed and persistent state has been erased. * Retrying INIT command here should succeed. */ - dev_dbg(sp->dev, "SEV: retrying INIT command"); + dev_dbg(sev->dev, "SEV: retrying INIT command"); rc = sev_platform_init(&error); } if (rc) { - dev_err(sp->dev, "SEV: failed to INIT error %#x\n", error); + dev_err(sev->dev, "SEV: failed to INIT error %#x\n", error); return; } - dev_info(sp->dev, "SEV API:%d.%d build:%d\n", psp_master->api_major, - psp_master->api_minor, psp_master->build); + dev_info(sev->dev, "SEV API:%d.%d build:%d\n", sev->api_major, + sev->api_minor, sev->build); return; err: - psp_master = NULL; + psp_master->sev_data = NULL; } -void psp_pci_exit(void) +void sev_pci_exit(void) { - if (!psp_master) + if (!psp_master->sev_data) return; sev_platform_shutdown(NULL); diff --git a/drivers/crypto/ccp/sev-dev.h b/drivers/crypto/ccp/sev-dev.h index e861647..3d84ac3 100644 --- a/drivers/crypto/ccp/sev-dev.h +++ b/drivers/crypto/ccp/sev-dev.h @@ -25,37 +25,25 @@ #include <linux/miscdevice.h> #include <linux/capability.h> -#include "sp-dev.h" - -#define PSP_CMD_COMPLETE BIT(1) - -#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 +#define SEV_CMD_COMPLETE BIT(1) +#define SEV_CMDRESP_CMD_SHIFT 16 +#define SEV_CMDRESP_IOC BIT(0) struct sev_misc_dev { struct kref refcount; struct miscdevice misc; }; -struct psp_device { - struct list_head entry; - - struct psp_vdata *vdata; - char name[MAX_PSP_NAME_LEN]; - +struct sev_device { struct device *dev; - struct sp_device *sp; + struct psp_device *psp; void __iomem *io_regs; - int sev_state; - unsigned int sev_int_rcvd; - wait_queue_head_t sev_int_queue; - struct sev_misc_dev *sev_misc; + int state; + unsigned int int_rcvd; + wait_queue_head_t int_queue; + struct sev_misc_dev *misc; struct sev_user_data_status status_cmd_buf; struct sev_data_init init_cmd_buf; @@ -64,4 +52,10 @@ struct psp_device { u8 build; }; +int sev_dev_init(struct psp_device *psp); +void sev_dev_destroy(struct psp_device *psp); + +void sev_pci_init(void); +void sev_pci_exit(void); + #endif /* __SEV_DEV_H */ diff --git a/drivers/crypto/ccp/sp-pci.c b/drivers/crypto/ccp/sp-pci.c index 473cf14..b29d2e6 100644 --- a/drivers/crypto/ccp/sp-pci.c +++ b/drivers/crypto/ccp/sp-pci.c @@ -22,7 +22,7 @@ #include <linux/ccp.h> #include "ccp-dev.h" -#include "sev-dev.h" +#include "psp-dev.h" #define MSIX_VECTORS 2