Star64_linux/drivers/char/tpm/tpm_crb.c
Linus Torvalds 456ed864fd ACPI updates for 6.2-rc1
- Update the ACPICA code in the kernel to the 20221020 upstream
    version and fix a couple of issues in it:
 
    * Make acpi_ex_load_op() match upstream implementation (Rafael
      Wysocki).
    * Add support for loong_arch-specific APICs in MADT (Huacai Chen).
    * Add support for fixed PCIe wake event (Huacai Chen).
    * Add EBDA pointer sanity checks (Vit Kabele).
    * Avoid accessing VGA memory when EBDA < 1KiB (Vit Kabele).
    * Add CCEL table support to both compiler/disassembler (Kuppuswamy
      Sathyanarayanan).
    * Add a couple of new UUIDs to the known UUID list (Bob Moore).
    * Add support for FFH Opregion special context data (Sudeep Holla).
    * Improve warning message for "invalid ACPI name" (Bob Moore).
    * Add support for CXL 3.0 structures (CXIMS & RDPAS) in the CEDT
      table (Alison Schofield).
    * Prepare IORT support for revision E.e (Robin Murphy).
    * Finish support for the CDAT table (Bob Moore).
    * Fix error code path in acpi_ds_call_control_method() (Rafael
      Wysocki).
    * Fix use-after-free in acpi_ut_copy_ipackage_to_ipackage() (Li
      Zetao).
    * Update the version of the ACPICA code in the kernel (Bob Moore).
 
  - Use ZERO_PAGE(0) instead of empty_zero_page in the ACPI device
    enumeration code (Giulio Benetti).
 
  - Change the return type of the ACPI driver remove callback to void and
    update its users accordingly (Dawei Li).
 
  - Add general support for FFH address space type and implement the low-
    level part of it for ARM64 (Sudeep Holla).
 
  - Fix stale comments in the ACPI tables parsing code and make it print
    more messages related to MADT (Hanjun Guo, Huacai Chen).
 
  - Replace invocations of generic library functions with more kernel-
    specific counterparts in the ACPI sysfs interface (Christophe JAILLET,
    Xu Panda).
 
  - Print full name paths of ACPI power resource objects during
    enumeration (Kane Chen).
 
  - Eliminate a compiler warning regarding a missing function prototype
    in the ACPI power management code (Sudeep Holla).
 
  - Fix and clean up the ACPI processor driver (Rafael Wysocki, Li Zhong,
    Colin Ian King, Sudeep Holla).
 
  - Add quirk for the HP Pavilion Gaming 15-cx0041ur to the ACPI EC
    driver (Mia Kanashi).
 
  - Add some mew ACPI backlight handling quirks and update some existing
    ones (Hans de Goede).
 
  - Make the ACPI backlight driver prefer the native backlight control
    over vendor backlight control when possible (Hans de Goede).
 
  - Drop unsetting ACPI APEI driver data on remove (Uwe Kleine-König).
 
  - Use xchg_release() instead of cmpxchg() for updating new GHES cache
    slots (Ard Biesheuvel).
 
  - Clean up the ACPI APEI code (Sudeep Holla, Christophe JAILLET, Jay Lu).
 
  - Add new I2C device enumeration quirks for Medion Lifetab S10346 and
    Lenovo Yoga Tab 3 Pro (YT3-X90F) (Hans de Goede).
 
  - Make the ACPI battery driver notify user space about adding new
    battery hooks and removing the existing ones (Armin Wolf).
 
  - Modify the pfr_update and pfr_telemetry drivers to use ACPI_FREE()
    for freeing acpi_object structures to help diagnostics (Wang ShaoBo).
 
  - Make the ACPI fan driver use sysfs_emit_at() in its sysfs interface
    code (ye xingchen).
 
  - Fix the _FIF package extraction failure handling in the ACPI fan
    driver (Hanjun Guo).
 
  - Fix the PCC mailbox handling error code path (Huisong Li).
 
  - Avoid using PCC Opregions if there is no platform interrupt allocated
    for this purpose (Huisong Li).
 
  - Use sysfs_emit() instead of scnprintf() in the ACPI PAD driver and
    CPPC library (ye xingchen).
 
  - Fix some kernel-doc issues in the ACPI GSI processing code (Xiongfeng
    Wang).
 
  - Fix name memory leak in pnp_alloc_dev() (Yang Yingliang).
 
  - Do not disable PNP devices on suspend when they cannot be re-enabled
    on resume (Hans de Goede).
 
  - Clean up the ACPI thermal driver a bit (Rafael Wysocki).
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Merge tag 'acpi-6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI and PNP updates from Rafael Wysocki:
 "These include new code (for instance, support for the FFH address
  space type and support for new firmware data structures in ACPICA),
  some new quirks (mostly related to backlight handling and I2C
  enumeration), a number of fixes and a fair amount of cleanups all
  over.

  Specifics:

   - Update the ACPICA code in the kernel to the 20221020 upstream
     version and fix a couple of issues in it:
      - Make acpi_ex_load_op() match upstream implementation (Rafael
        Wysocki)
      - Add support for loong_arch-specific APICs in MADT (Huacai Chen)
      - Add support for fixed PCIe wake event (Huacai Chen)
      - Add EBDA pointer sanity checks (Vit Kabele)
      - Avoid accessing VGA memory when EBDA < 1KiB (Vit Kabele)
      - Add CCEL table support to both compiler/disassembler (Kuppuswamy
        Sathyanarayanan)
      - Add a couple of new UUIDs to the known UUID list (Bob Moore)
      - Add support for FFH Opregion special context data (Sudeep
        Holla)
      - Improve warning message for "invalid ACPI name" (Bob Moore)
      - Add support for CXL 3.0 structures (CXIMS & RDPAS) in the CEDT
        table (Alison Schofield)
      - Prepare IORT support for revision E.e (Robin Murphy)
      - Finish support for the CDAT table (Bob Moore)
      - Fix error code path in acpi_ds_call_control_method() (Rafael
        Wysocki)
      - Fix use-after-free in acpi_ut_copy_ipackage_to_ipackage() (Li
        Zetao)
      - Update the version of the ACPICA code in the kernel (Bob Moore)

   - Use ZERO_PAGE(0) instead of empty_zero_page in the ACPI device
     enumeration code (Giulio Benetti)

   - Change the return type of the ACPI driver remove callback to void
     and update its users accordingly (Dawei Li)

   - Add general support for FFH address space type and implement the
     low- level part of it for ARM64 (Sudeep Holla)

   - Fix stale comments in the ACPI tables parsing code and make it
     print more messages related to MADT (Hanjun Guo, Huacai Chen)

   - Replace invocations of generic library functions with more kernel-
     specific counterparts in the ACPI sysfs interface (Christophe
     JAILLET, Xu Panda)

   - Print full name paths of ACPI power resource objects during
     enumeration (Kane Chen)

   - Eliminate a compiler warning regarding a missing function prototype
     in the ACPI power management code (Sudeep Holla)

   - Fix and clean up the ACPI processor driver (Rafael Wysocki, Li
     Zhong, Colin Ian King, Sudeep Holla)

   - Add quirk for the HP Pavilion Gaming 15-cx0041ur to the ACPI EC
     driver (Mia Kanashi)

   - Add some mew ACPI backlight handling quirks and update some
     existing ones (Hans de Goede)

   - Make the ACPI backlight driver prefer the native backlight control
     over vendor backlight control when possible (Hans de Goede)

   - Drop unsetting ACPI APEI driver data on remove (Uwe Kleine-König)

   - Use xchg_release() instead of cmpxchg() for updating new GHES cache
     slots (Ard Biesheuvel)

   - Clean up the ACPI APEI code (Sudeep Holla, Christophe JAILLET, Jay
     Lu)

   - Add new I2C device enumeration quirks for Medion Lifetab S10346 and
     Lenovo Yoga Tab 3 Pro (YT3-X90F) (Hans de Goede)

   - Make the ACPI battery driver notify user space about adding new
     battery hooks and removing the existing ones (Armin Wolf)

   - Modify the pfr_update and pfr_telemetry drivers to use ACPI_FREE()
     for freeing acpi_object structures to help diagnostics (Wang
     ShaoBo)

   - Make the ACPI fan driver use sysfs_emit_at() in its sysfs interface
     code (ye xingchen)

   - Fix the _FIF package extraction failure handling in the ACPI fan
     driver (Hanjun Guo)

   - Fix the PCC mailbox handling error code path (Huisong Li)

   - Avoid using PCC Opregions if there is no platform interrupt
     allocated for this purpose (Huisong Li)

   - Use sysfs_emit() instead of scnprintf() in the ACPI PAD driver and
     CPPC library (ye xingchen)

   - Fix some kernel-doc issues in the ACPI GSI processing code
     (Xiongfeng Wang)

   - Fix name memory leak in pnp_alloc_dev() (Yang Yingliang)

   - Do not disable PNP devices on suspend when they cannot be
     re-enabled on resume (Hans de Goede)

   - Clean up the ACPI thermal driver a bit (Rafael Wysocki)"

* tag 'acpi-6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (67 commits)
  ACPI: x86: Add skip i2c clients quirk for Medion Lifetab S10346
  ACPI: APEI: EINJ: Refactor available_error_type_show()
  ACPI: APEI: EINJ: Fix formatting errors
  ACPI: processor: perflib: Adjust acpi_processor_notify_smm() return value
  ACPI: processor: perflib: Rearrange acpi_processor_notify_smm()
  ACPI: processor: perflib: Rearrange unregistration routine
  ACPI: processor: perflib: Drop redundant parentheses
  ACPI: processor: perflib: Adjust white space
  ACPI: processor: idle: Drop unnecessary statements and parens
  ACPI: thermal: Adjust critical.flags.valid check
  ACPI: fan: Convert to use sysfs_emit_at() API
  ACPICA: Fix use-after-free in acpi_ut_copy_ipackage_to_ipackage()
  ACPI: battery: Call power_supply_changed() when adding hooks
  ACPI: use sysfs_emit() instead of scnprintf()
  ACPI: x86: Add skip i2c clients quirk for Lenovo Yoga Tab 3 Pro (YT3-X90F)
  ACPI: APEI: Remove a useless include
  PNP: Do not disable devices on suspend when they cannot be re-enabled on resume
  ACPI: processor: Silence missing prototype warnings
  ACPI: processor_idle: Silence missing prototype warnings
  ACPI: PM: Silence missing prototype warning
  ...
2022-12-12 13:38:17 -08:00

761 lines
18 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2014 Intel Corporation
*
* Authors:
* Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
*
* Maintained by: <tpmdd-devel@lists.sourceforge.net>
*
* This device driver implements the TPM interface as defined in
* the TCG CRB 2.0 TPM specification.
*/
#include <linux/acpi.h>
#include <linux/highmem.h>
#include <linux/rculist.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#ifdef CONFIG_ARM64
#include <linux/arm-smccc.h>
#endif
#include "tpm.h"
#define ACPI_SIG_TPM2 "TPM2"
#define TPM_CRB_MAX_RESOURCES 3
static const guid_t crb_acpi_start_guid =
GUID_INIT(0x6BBF6CAB, 0x5463, 0x4714,
0xB7, 0xCD, 0xF0, 0x20, 0x3C, 0x03, 0x68, 0xD4);
enum crb_defaults {
CRB_ACPI_START_REVISION_ID = 1,
CRB_ACPI_START_INDEX = 1,
};
enum crb_loc_ctrl {
CRB_LOC_CTRL_REQUEST_ACCESS = BIT(0),
CRB_LOC_CTRL_RELINQUISH = BIT(1),
};
enum crb_loc_state {
CRB_LOC_STATE_LOC_ASSIGNED = BIT(1),
CRB_LOC_STATE_TPM_REG_VALID_STS = BIT(7),
};
enum crb_ctrl_req {
CRB_CTRL_REQ_CMD_READY = BIT(0),
CRB_CTRL_REQ_GO_IDLE = BIT(1),
};
enum crb_ctrl_sts {
CRB_CTRL_STS_ERROR = BIT(0),
CRB_CTRL_STS_TPM_IDLE = BIT(1),
};
enum crb_start {
CRB_START_INVOKE = BIT(0),
};
enum crb_cancel {
CRB_CANCEL_INVOKE = BIT(0),
};
struct crb_regs_head {
u32 loc_state;
u32 reserved1;
u32 loc_ctrl;
u32 loc_sts;
u8 reserved2[32];
u64 intf_id;
u64 ctrl_ext;
} __packed;
struct crb_regs_tail {
u32 ctrl_req;
u32 ctrl_sts;
u32 ctrl_cancel;
u32 ctrl_start;
u32 ctrl_int_enable;
u32 ctrl_int_sts;
u32 ctrl_cmd_size;
u32 ctrl_cmd_pa_low;
u32 ctrl_cmd_pa_high;
u32 ctrl_rsp_size;
u64 ctrl_rsp_pa;
} __packed;
enum crb_status {
CRB_DRV_STS_COMPLETE = BIT(0),
};
struct crb_priv {
u32 sm;
const char *hid;
struct crb_regs_head __iomem *regs_h;
struct crb_regs_tail __iomem *regs_t;
u8 __iomem *cmd;
u8 __iomem *rsp;
u32 cmd_size;
u32 smc_func_id;
};
struct tpm2_crb_smc {
u32 interrupt;
u8 interrupt_flags;
u8 op_flags;
u16 reserved2;
u32 smc_func_id;
};
static bool crb_wait_for_reg_32(u32 __iomem *reg, u32 mask, u32 value,
unsigned long timeout)
{
ktime_t start;
ktime_t stop;
start = ktime_get();
stop = ktime_add(start, ms_to_ktime(timeout));
do {
if ((ioread32(reg) & mask) == value)
return true;
usleep_range(50, 100);
} while (ktime_before(ktime_get(), stop));
return ((ioread32(reg) & mask) == value);
}
/**
* __crb_go_idle - request tpm crb device to go the idle state
*
* @dev: crb device
* @priv: crb private data
*
* Write CRB_CTRL_REQ_GO_IDLE to TPM_CRB_CTRL_REQ
* The device should respond within TIMEOUT_C by clearing the bit.
* Anyhow, we do not wait here as a consequent CMD_READY request
* will be handled correctly even if idle was not completed.
*
* The function does nothing for devices with ACPI-start method
* or SMC-start method.
*
* Return: 0 always
*/
static int __crb_go_idle(struct device *dev, struct crb_priv *priv)
{
if ((priv->sm == ACPI_TPM2_START_METHOD) ||
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) ||
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC))
return 0;
iowrite32(CRB_CTRL_REQ_GO_IDLE, &priv->regs_t->ctrl_req);
if (!crb_wait_for_reg_32(&priv->regs_t->ctrl_req,
CRB_CTRL_REQ_GO_IDLE/* mask */,
0, /* value */
TPM2_TIMEOUT_C)) {
dev_warn(dev, "goIdle timed out\n");
return -ETIME;
}
return 0;
}
static int crb_go_idle(struct tpm_chip *chip)
{
struct device *dev = &chip->dev;
struct crb_priv *priv = dev_get_drvdata(dev);
return __crb_go_idle(dev, priv);
}
/**
* __crb_cmd_ready - request tpm crb device to enter ready state
*
* @dev: crb device
* @priv: crb private data
*
* Write CRB_CTRL_REQ_CMD_READY to TPM_CRB_CTRL_REQ
* and poll till the device acknowledge it by clearing the bit.
* The device should respond within TIMEOUT_C.
*
* The function does nothing for devices with ACPI-start method
* or SMC-start method.
*
* Return: 0 on success -ETIME on timeout;
*/
static int __crb_cmd_ready(struct device *dev, struct crb_priv *priv)
{
if ((priv->sm == ACPI_TPM2_START_METHOD) ||
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) ||
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC))
return 0;
iowrite32(CRB_CTRL_REQ_CMD_READY, &priv->regs_t->ctrl_req);
if (!crb_wait_for_reg_32(&priv->regs_t->ctrl_req,
CRB_CTRL_REQ_CMD_READY /* mask */,
0, /* value */
TPM2_TIMEOUT_C)) {
dev_warn(dev, "cmdReady timed out\n");
return -ETIME;
}
return 0;
}
static int crb_cmd_ready(struct tpm_chip *chip)
{
struct device *dev = &chip->dev;
struct crb_priv *priv = dev_get_drvdata(dev);
return __crb_cmd_ready(dev, priv);
}
static int __crb_request_locality(struct device *dev,
struct crb_priv *priv, int loc)
{
u32 value = CRB_LOC_STATE_LOC_ASSIGNED |
CRB_LOC_STATE_TPM_REG_VALID_STS;
if (!priv->regs_h)
return 0;
iowrite32(CRB_LOC_CTRL_REQUEST_ACCESS, &priv->regs_h->loc_ctrl);
if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, value, value,
TPM2_TIMEOUT_C)) {
dev_warn(dev, "TPM_LOC_STATE_x.requestAccess timed out\n");
return -ETIME;
}
return 0;
}
static int crb_request_locality(struct tpm_chip *chip, int loc)
{
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
return __crb_request_locality(&chip->dev, priv, loc);
}
static int __crb_relinquish_locality(struct device *dev,
struct crb_priv *priv, int loc)
{
u32 mask = CRB_LOC_STATE_LOC_ASSIGNED |
CRB_LOC_STATE_TPM_REG_VALID_STS;
u32 value = CRB_LOC_STATE_TPM_REG_VALID_STS;
if (!priv->regs_h)
return 0;
iowrite32(CRB_LOC_CTRL_RELINQUISH, &priv->regs_h->loc_ctrl);
if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, mask, value,
TPM2_TIMEOUT_C)) {
dev_warn(dev, "TPM_LOC_STATE_x.Relinquish timed out\n");
return -ETIME;
}
return 0;
}
static int crb_relinquish_locality(struct tpm_chip *chip, int loc)
{
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
return __crb_relinquish_locality(&chip->dev, priv, loc);
}
static u8 crb_status(struct tpm_chip *chip)
{
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
u8 sts = 0;
if ((ioread32(&priv->regs_t->ctrl_start) & CRB_START_INVOKE) !=
CRB_START_INVOKE)
sts |= CRB_DRV_STS_COMPLETE;
return sts;
}
static int crb_recv(struct tpm_chip *chip, u8 *buf, size_t count)
{
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
unsigned int expected;
/* A sanity check that the upper layer wants to get at least the header
* as that is the minimum size for any TPM response.
*/
if (count < TPM_HEADER_SIZE)
return -EIO;
/* If this bit is set, according to the spec, the TPM is in
* unrecoverable condition.
*/
if (ioread32(&priv->regs_t->ctrl_sts) & CRB_CTRL_STS_ERROR)
return -EIO;
/* Read the first 8 bytes in order to get the length of the response.
* We read exactly a quad word in order to make sure that the remaining
* reads will be aligned.
*/
memcpy_fromio(buf, priv->rsp, 8);
expected = be32_to_cpup((__be32 *)&buf[2]);
if (expected > count || expected < TPM_HEADER_SIZE)
return -EIO;
memcpy_fromio(&buf[8], &priv->rsp[8], expected - 8);
return expected;
}
static int crb_do_acpi_start(struct tpm_chip *chip)
{
union acpi_object *obj;
int rc;
obj = acpi_evaluate_dsm(chip->acpi_dev_handle,
&crb_acpi_start_guid,
CRB_ACPI_START_REVISION_ID,
CRB_ACPI_START_INDEX,
NULL);
if (!obj)
return -ENXIO;
rc = obj->integer.value == 0 ? 0 : -ENXIO;
ACPI_FREE(obj);
return rc;
}
#ifdef CONFIG_ARM64
/*
* This is a TPM Command Response Buffer start method that invokes a
* Secure Monitor Call to requrest the firmware to execute or cancel
* a TPM 2.0 command.
*/
static int tpm_crb_smc_start(struct device *dev, unsigned long func_id)
{
struct arm_smccc_res res;
arm_smccc_smc(func_id, 0, 0, 0, 0, 0, 0, 0, &res);
if (res.a0 != 0) {
dev_err(dev,
FW_BUG "tpm_crb_smc_start() returns res.a0 = 0x%lx\n",
res.a0);
return -EIO;
}
return 0;
}
#else
static int tpm_crb_smc_start(struct device *dev, unsigned long func_id)
{
dev_err(dev, FW_BUG "tpm_crb: incorrect start method\n");
return -EINVAL;
}
#endif
static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len)
{
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
int rc = 0;
/* Zero the cancel register so that the next command will not get
* canceled.
*/
iowrite32(0, &priv->regs_t->ctrl_cancel);
if (len > priv->cmd_size) {
dev_err(&chip->dev, "invalid command count value %zd %d\n",
len, priv->cmd_size);
return -E2BIG;
}
memcpy_toio(priv->cmd, buf, len);
/* Make sure that cmd is populated before issuing start. */
wmb();
/* The reason for the extra quirk is that the PTT in 4th Gen Core CPUs
* report only ACPI start but in practice seems to require both
* CRB start, hence invoking CRB start method if hid == MSFT0101.
*/
if ((priv->sm == ACPI_TPM2_COMMAND_BUFFER) ||
(priv->sm == ACPI_TPM2_MEMORY_MAPPED) ||
(!strcmp(priv->hid, "MSFT0101")))
iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start);
if ((priv->sm == ACPI_TPM2_START_METHOD) ||
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD))
rc = crb_do_acpi_start(chip);
if (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) {
iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start);
rc = tpm_crb_smc_start(&chip->dev, priv->smc_func_id);
}
return rc;
}
static void crb_cancel(struct tpm_chip *chip)
{
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
iowrite32(CRB_CANCEL_INVOKE, &priv->regs_t->ctrl_cancel);
if (((priv->sm == ACPI_TPM2_START_METHOD) ||
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD)) &&
crb_do_acpi_start(chip))
dev_err(&chip->dev, "ACPI Start failed\n");
}
static bool crb_req_canceled(struct tpm_chip *chip, u8 status)
{
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
u32 cancel = ioread32(&priv->regs_t->ctrl_cancel);
return (cancel & CRB_CANCEL_INVOKE) == CRB_CANCEL_INVOKE;
}
static const struct tpm_class_ops tpm_crb = {
.flags = TPM_OPS_AUTO_STARTUP,
.status = crb_status,
.recv = crb_recv,
.send = crb_send,
.cancel = crb_cancel,
.req_canceled = crb_req_canceled,
.go_idle = crb_go_idle,
.cmd_ready = crb_cmd_ready,
.request_locality = crb_request_locality,
.relinquish_locality = crb_relinquish_locality,
.req_complete_mask = CRB_DRV_STS_COMPLETE,
.req_complete_val = CRB_DRV_STS_COMPLETE,
};
static int crb_check_resource(struct acpi_resource *ares, void *data)
{
struct resource *iores_array = data;
struct resource_win win;
struct resource *res = &(win.res);
int i;
if (acpi_dev_resource_memory(ares, res) ||
acpi_dev_resource_address_space(ares, &win)) {
for (i = 0; i < TPM_CRB_MAX_RESOURCES + 1; ++i) {
if (resource_type(iores_array + i) != IORESOURCE_MEM) {
iores_array[i] = *res;
iores_array[i].name = NULL;
break;
}
}
}
return 1;
}
static void __iomem *crb_map_res(struct device *dev, struct resource *iores,
void __iomem **iobase_ptr, u64 start, u32 size)
{
struct resource new_res = {
.start = start,
.end = start + size - 1,
.flags = IORESOURCE_MEM,
};
/* Detect a 64 bit address on a 32 bit system */
if (start != new_res.start)
return IOMEM_ERR_PTR(-EINVAL);
if (!iores)
return devm_ioremap_resource(dev, &new_res);
if (!*iobase_ptr) {
*iobase_ptr = devm_ioremap_resource(dev, iores);
if (IS_ERR(*iobase_ptr))
return *iobase_ptr;
}
return *iobase_ptr + (new_res.start - iores->start);
}
/*
* Work around broken BIOSs that return inconsistent values from the ACPI
* region vs the registers. Trust the ACPI region. Such broken systems
* probably cannot send large TPM commands since the buffer will be truncated.
*/
static u64 crb_fixup_cmd_size(struct device *dev, struct resource *io_res,
u64 start, u64 size)
{
if (io_res->start > start || io_res->end < start)
return size;
if (start + size - 1 <= io_res->end)
return size;
dev_err(dev,
FW_BUG "ACPI region does not cover the entire command/response buffer. %pr vs %llx %llx\n",
io_res, start, size);
return io_res->end - start + 1;
}
static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
struct acpi_table_tpm2 *buf)
{
struct list_head acpi_resource_list;
struct resource iores_array[TPM_CRB_MAX_RESOURCES + 1] = { {0} };
void __iomem *iobase_array[TPM_CRB_MAX_RESOURCES] = {NULL};
struct device *dev = &device->dev;
struct resource *iores;
void __iomem **iobase_ptr;
int i;
u32 pa_high, pa_low;
u64 cmd_pa;
u32 cmd_size;
__le64 __rsp_pa;
u64 rsp_pa;
u32 rsp_size;
int ret;
INIT_LIST_HEAD(&acpi_resource_list);
ret = acpi_dev_get_resources(device, &acpi_resource_list,
crb_check_resource, iores_array);
if (ret < 0)
return ret;
acpi_dev_free_resource_list(&acpi_resource_list);
if (resource_type(iores_array) != IORESOURCE_MEM) {
dev_err(dev, FW_BUG "TPM2 ACPI table does not define a memory resource\n");
return -EINVAL;
} else if (resource_type(iores_array + TPM_CRB_MAX_RESOURCES) ==
IORESOURCE_MEM) {
dev_warn(dev, "TPM2 ACPI table defines too many memory resources\n");
memset(iores_array + TPM_CRB_MAX_RESOURCES,
0, sizeof(*iores_array));
iores_array[TPM_CRB_MAX_RESOURCES].flags = 0;
}
iores = NULL;
iobase_ptr = NULL;
for (i = 0; resource_type(iores_array + i) == IORESOURCE_MEM; ++i) {
if (buf->control_address >= iores_array[i].start &&
buf->control_address + sizeof(struct crb_regs_tail) - 1 <=
iores_array[i].end) {
iores = iores_array + i;
iobase_ptr = iobase_array + i;
break;
}
}
priv->regs_t = crb_map_res(dev, iores, iobase_ptr, buf->control_address,
sizeof(struct crb_regs_tail));
if (IS_ERR(priv->regs_t))
return PTR_ERR(priv->regs_t);
/* The ACPI IO region starts at the head area and continues to include
* the control area, as one nice sane region except for some older
* stuff that puts the control area outside the ACPI IO region.
*/
if ((priv->sm == ACPI_TPM2_COMMAND_BUFFER) ||
(priv->sm == ACPI_TPM2_MEMORY_MAPPED)) {
if (iores &&
buf->control_address == iores->start +
sizeof(*priv->regs_h))
priv->regs_h = *iobase_ptr;
else
dev_warn(dev, FW_BUG "Bad ACPI memory layout");
}
ret = __crb_request_locality(dev, priv, 0);
if (ret)
return ret;
/*
* PTT HW bug w/a: wake up the device to access
* possibly not retained registers.
*/
ret = __crb_cmd_ready(dev, priv);
if (ret)
goto out_relinquish_locality;
pa_high = ioread32(&priv->regs_t->ctrl_cmd_pa_high);
pa_low = ioread32(&priv->regs_t->ctrl_cmd_pa_low);
cmd_pa = ((u64)pa_high << 32) | pa_low;
cmd_size = ioread32(&priv->regs_t->ctrl_cmd_size);
iores = NULL;
iobase_ptr = NULL;
for (i = 0; iores_array[i].end; ++i) {
if (cmd_pa >= iores_array[i].start &&
cmd_pa <= iores_array[i].end) {
iores = iores_array + i;
iobase_ptr = iobase_array + i;
break;
}
}
if (iores)
cmd_size = crb_fixup_cmd_size(dev, iores, cmd_pa, cmd_size);
dev_dbg(dev, "cmd_hi = %X cmd_low = %X cmd_size %X\n",
pa_high, pa_low, cmd_size);
priv->cmd = crb_map_res(dev, iores, iobase_ptr, cmd_pa, cmd_size);
if (IS_ERR(priv->cmd)) {
ret = PTR_ERR(priv->cmd);
goto out;
}
memcpy_fromio(&__rsp_pa, &priv->regs_t->ctrl_rsp_pa, 8);
rsp_pa = le64_to_cpu(__rsp_pa);
rsp_size = ioread32(&priv->regs_t->ctrl_rsp_size);
iores = NULL;
iobase_ptr = NULL;
for (i = 0; resource_type(iores_array + i) == IORESOURCE_MEM; ++i) {
if (rsp_pa >= iores_array[i].start &&
rsp_pa <= iores_array[i].end) {
iores = iores_array + i;
iobase_ptr = iobase_array + i;
break;
}
}
if (iores)
rsp_size = crb_fixup_cmd_size(dev, iores, rsp_pa, rsp_size);
if (cmd_pa != rsp_pa) {
priv->rsp = crb_map_res(dev, iores, iobase_ptr,
rsp_pa, rsp_size);
ret = PTR_ERR_OR_ZERO(priv->rsp);
goto out;
}
/* According to the PTP specification, overlapping command and response
* buffer sizes must be identical.
*/
if (cmd_size != rsp_size) {
dev_err(dev, FW_BUG "overlapping command and response buffer sizes are not identical");
ret = -EINVAL;
goto out;
}
priv->rsp = priv->cmd;
out:
if (!ret)
priv->cmd_size = cmd_size;
__crb_go_idle(dev, priv);
out_relinquish_locality:
__crb_relinquish_locality(dev, priv, 0);
return ret;
}
static int crb_acpi_add(struct acpi_device *device)
{
struct acpi_table_tpm2 *buf;
struct crb_priv *priv;
struct tpm_chip *chip;
struct device *dev = &device->dev;
struct tpm2_crb_smc *crb_smc;
acpi_status status;
u32 sm;
int rc;
status = acpi_get_table(ACPI_SIG_TPM2, 1,
(struct acpi_table_header **) &buf);
if (ACPI_FAILURE(status) || buf->header.length < sizeof(*buf)) {
dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n");
return -EINVAL;
}
/* Should the FIFO driver handle this? */
sm = buf->start_method;
if (sm == ACPI_TPM2_MEMORY_MAPPED) {
rc = -ENODEV;
goto out;
}
priv = devm_kzalloc(dev, sizeof(struct crb_priv), GFP_KERNEL);
if (!priv) {
rc = -ENOMEM;
goto out;
}
if (sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) {
if (buf->header.length < (sizeof(*buf) + sizeof(*crb_smc))) {
dev_err(dev,
FW_BUG "TPM2 ACPI table has wrong size %u for start method type %d\n",
buf->header.length,
ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC);
rc = -EINVAL;
goto out;
}
crb_smc = ACPI_ADD_PTR(struct tpm2_crb_smc, buf, sizeof(*buf));
priv->smc_func_id = crb_smc->smc_func_id;
}
priv->sm = sm;
priv->hid = acpi_device_hid(device);
rc = crb_map_io(device, priv, buf);
if (rc)
goto out;
chip = tpmm_chip_alloc(dev, &tpm_crb);
if (IS_ERR(chip)) {
rc = PTR_ERR(chip);
goto out;
}
dev_set_drvdata(&chip->dev, priv);
chip->acpi_dev_handle = device->handle;
chip->flags = TPM_CHIP_FLAG_TPM2;
rc = tpm_chip_register(chip);
out:
acpi_put_table((struct acpi_table_header *)buf);
return rc;
}
static void crb_acpi_remove(struct acpi_device *device)
{
struct device *dev = &device->dev;
struct tpm_chip *chip = dev_get_drvdata(dev);
tpm_chip_unregister(chip);
}
static const struct dev_pm_ops crb_pm = {
SET_SYSTEM_SLEEP_PM_OPS(tpm_pm_suspend, tpm_pm_resume)
};
static const struct acpi_device_id crb_device_ids[] = {
{"MSFT0101", 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, crb_device_ids);
static struct acpi_driver crb_acpi_driver = {
.name = "tpm_crb",
.ids = crb_device_ids,
.ops = {
.add = crb_acpi_add,
.remove = crb_acpi_remove,
},
.drv = {
.pm = &crb_pm,
},
};
module_acpi_driver(crb_acpi_driver);
MODULE_AUTHOR("Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>");
MODULE_DESCRIPTION("TPM2 Driver");
MODULE_VERSION("0.1");
MODULE_LICENSE("GPL");