Message-ID: <1340193761.12326.15.camel@falcor>
Date:	Wed, 20 Jun 2012 08:02:41 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	"Zhang, Xiaoyan" <xiaoyan.zhang@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tpmdd-devel@...ts.sourceforge.net" 
	<tpmdd-devel@...ts.sourceforge.net>
Subject: Re: [tpmdd-devel] [PATCH V2 1/2] driver: add PPI support in tpm
 driver

On Wed, 2012-06-20 at 08:15 +0000, Zhang, Xiaoyan wrote:
> From: Xiaoyan Zhang <xiaoyan.zhang@...el.com>
> 
> The Physical Presence Interface enables the OS and the BIOS to cooperate
> and provides a simple and straightforward platform user experience for
> administering the TPM without sacrificing security.
> 
> V2: separate the patch out in a separate source file, add #ifdef CONFIG_ACPI
> so it compiles out on ppc, and use standard error instead of ACPI error as
> return code of show/store fns.

ifdef's don't belong in .c code.  The normal practice is to define the
function declaration and a stub function in an include file based on the
ifdef.  Having a separate source file, allows you to include different
code in the Makefile.

> 
> Signed-off-by: Xiaoyan Zhang <xiaoyan.zhang@...el.com>
> ---
>  drivers/char/tpm/Makefile  |    3 +-
>  drivers/char/tpm/tpm.c     |   11 +
>  drivers/char/tpm/tpm.h     |    1 +
>  drivers/char/tpm/tpm_ppi.c |  450 ++++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 464 insertions(+), 1 deletions(-)
>  create mode 100644 drivers/char/tpm/tpm_ppi.c
> 
> diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
> index ea3a1e0..fe87366 100644
> --- a/drivers/char/tpm/Makefile
> +++ b/drivers/char/tpm/Makefile
> @@ -1,7 +1,8 @@
>  #
>  # Makefile for the kernel tpm device drivers.
>  #
> -obj-$(CONFIG_TCG_TPM) += tpm.o
> +obj-$(CONFIG_TCG_TPM) += tpm_main.o
> +tpm_main-y += tpm.o tpm_ppi.o
>  ifdef CONFIG_ACPI
>  	obj-$(CONFIG_TCG_TPM) += tpm_bios.o
>  endif

Shouldn't tpm_ppi be in the CONFIG_ACPI ifdef?

> diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
> index ad7c732..d5db4fa 100644
> --- a/drivers/char/tpm/tpm.c
> +++ b/drivers/char/tpm/tpm.c
> @@ -1361,6 +1361,9 @@ struct tpm_chip *tpm_register_hardware(struct device *dev,
>  	char *devname;
>  	struct tpm_chip *chip;
> 
> +#ifdef CONFIG_ACPI
> +	struct kobject *ppi;
> +#endif
>  	/* Driver specific per-device data */
>  	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
>  	devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
> @@ -1416,6 +1419,14 @@ struct tpm_chip *tpm_register_hardware(struct device *dev,
>  		return NULL;
>  	}
> 
> +#ifdef CONFIG_ACPI
> +	ppi = kobject_create_and_add("ppi", &dev->kobj);
> +	if (sysfs_create_group(ppi, &ppi_attr_grp)) {
> +		misc_deregister(&chip->vendor.miscdev);
> +		put_device(chip->dev);
> +		return NULL;
> +	}
> +#endif

This should be a function defined in tpm_ppi.c.  The function definition
and stub function definition would be defined in a .h file as well.

Mimi

>  	chip->bios_dir = tpm_bios_log_setup(devname);
> 
>  	/* Make chip available */
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index b1c5280..9f706ad 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -306,6 +306,7 @@ extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
>  #ifdef CONFIG_ACPI
>  extern struct dentry ** tpm_bios_log_setup(char *);
>  extern void tpm_bios_log_teardown(struct dentry **);
> +extern struct attribute_group ppi_attr_grp;
>  #else
>  static inline struct dentry ** tpm_bios_log_setup(char *name)
>  {
> diff --git a/drivers/char/tpm/tpm_ppi.c b/drivers/char/tpm/tpm_ppi.c
> new file mode 100644
> index 0000000..eaf0592
> --- /dev/null
> +++ b/drivers/char/tpm/tpm_ppi.c
> @@ -0,0 +1,450 @@
> +#include <linux/acpi.h>
> +#include <acpi/acpi_drivers.h>
> +#include "tpm.h"
> +
> +static const u8 tpm_ppi_uuid[] = {
> +	0xA6, 0xFA, 0xDD, 0x3D,
> +	0x1B, 0x36,
> +	0xB4, 0x4E,
> +	0xA4, 0x24,
> +	0x8D, 0x10, 0x08, 0x9D, 0x16, 0x53
> +};
> +static char *tpm_device_name = "TPM";
> +
> +#define TPM_PPI_REVISION_ID	1
> +#define TPM_PPI_FN_VERSION	1
> +#define TPM_PPI_FN_SUBREQ	2
> +#define TPM_PPI_FN_GETREQ	3
> +#define TPM_PPI_FN_GETACT	4
> +#define TPM_PPI_FN_GETRSP	5
> +#define TPM_PPI_FN_SUBREQ2	7
> +#define TPM_PPI_FN_GETOPR	8
> +#define PPI_TPM_REQ_MAX		22
> +#define PPI_VS_REQ_START	128
> +#define PPI_VS_REQ_END		255
> +#define PPI_VERSION_LEN		3
> +
> +static acpi_status ppi_callback(acpi_handle handle, u32 level, void *context,
> +				void **return_value)
> +{
> +	acpi_status status;
> +	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
> +	status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
> +	if (strstr(buffer.pointer, context) != NULL) {
> +		*return_value = handle;
> +		kfree(buffer.pointer);
> +		return AE_CTRL_TERMINATE;
> +	}
> +	return AE_OK;
> +}
> +
> +static inline void ppi_assign_params(union acpi_object params[4],
> +				     u64 function_num)
> +{
> +	params[0].type = ACPI_TYPE_BUFFER;
> +	params[0].buffer.length = sizeof(tpm_ppi_uuid);
> +	params[0].buffer.pointer = (char *)tpm_ppi_uuid;
> +	params[1].type = ACPI_TYPE_INTEGER;
> +	params[1].integer.value = TPM_PPI_REVISION_ID;
> +	params[2].type = ACPI_TYPE_INTEGER;
> +	params[2].integer.value = function_num;
> +	params[3].type = ACPI_TYPE_PACKAGE;
> +	params[3].package.count = 0;
> +	params[3].package.elements = NULL;
> +}
> +
> +ssize_t tpm_show_ppi_version(struct device *dev, struct device_attribute *attr,
> +			     char *buf)
> +{
> +	acpi_handle handle;
> +	acpi_status status;
> +	struct acpi_object_list input;
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	union acpi_object params[4];
> +	union acpi_object *obj;
> +
> +	input.count = 4;
> +	ppi_assign_params(params, TPM_PPI_FN_VERSION);
> +	input.pointer = params;
> +	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
> +				     ACPI_UINT32_MAX, ppi_callback, NULL,
> +				     tpm_device_name, &handle);
> +	if (ACPI_FAILURE(status))
> +		return -ENXIO;
> +
> +	status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
> +					 ACPI_TYPE_STRING);
> +	if (ACPI_FAILURE(status))
> +		return -ENOMEM;
> +	obj = (union acpi_object *)output.pointer;
> +	status = scnprintf(buf, PAGE_SIZE, "%s\n", obj->string.pointer);
> +	kfree(output.pointer);
> +	return status;
> +}
> +
> +ssize_t tpm_show_ppi_request(struct device *dev,
> +			     struct device_attribute *attr,
> +			     char *buf)
> +{
> +	acpi_handle handle;
> +	acpi_status status;
> +	struct acpi_object_list input;
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	union acpi_object params[4];
> +	union acpi_object *ret_obj;
> +
> +	input.count = 4;
> +	ppi_assign_params(params, TPM_PPI_FN_GETREQ);
> +	input.pointer = params;
> +	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
> +				     ACPI_UINT32_MAX, ppi_callback, NULL,
> +				     tpm_device_name, &handle);
> +	if (ACPI_FAILURE(status))
> +		return -ENXIO;
> +
> +	status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
> +					    ACPI_TYPE_PACKAGE);
> +	if (ACPI_FAILURE(status))
> +		return -ENOMEM;
> +	/*
> +	 * output.pointer should be of package type, including two integers.
> +	 * The first is function return code, 0 means success and 1 means
> +	 * error. The second is pending TPM operation requested by the OS, 0
> +	 * means none and >0 means operation value.
> +	 */
> +	ret_obj = ((union acpi_object *)output.pointer)->package.elements;
> +	if (ret_obj->type == ACPI_TYPE_INTEGER) {
> +		if (ret_obj->integer.value) {
> +			status = -EFAULT;
> +			goto cleanup;
> +		}
> +		ret_obj++;
> +		if (ret_obj->type == ACPI_TYPE_INTEGER)
> +			status = scnprintf(buf, PAGE_SIZE, "%llu\n",
> +					   ret_obj->integer.value);
> +		else
> +			status = -EINVAL;
> +	} else {
> +		status = -EINVAL;
> +	}
> +cleanup:
> +	kfree(output.pointer);
> +	return status;
> +}
> +
> +ssize_t tpm_store_ppi_request(struct device *dev,
> +			      struct device_attribute *attr,
> +			      const char *buf, size_t count)
> +{
> +	char version[PPI_VERSION_LEN + 1];
> +	acpi_handle handle;
> +	acpi_status status;
> +	struct acpi_object_list input;
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	union acpi_object params[4];
> +	union acpi_object obj;
> +	u32 req;
> +	u64 ret;
> +
> +	input.count = 4;
> +	ppi_assign_params(params, TPM_PPI_FN_VERSION);
> +	input.pointer = params;
> +	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
> +				     ACPI_UINT32_MAX, ppi_callback, NULL,
> +				     tpm_device_name, &handle);
> +	if (ACPI_FAILURE(status))
> +		return -ENXIO;
> +
> +	status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
> +					    ACPI_TYPE_STRING);
> +	if (ACPI_FAILURE(status))
> +		return -ENOMEM;
> +	strncpy(version,
> +		((union acpi_object *)output.pointer)->string.pointer,
> +		PPI_VERSION_LEN);
> +	kfree(output.pointer);
> +	output.length = ACPI_ALLOCATE_BUFFER;
> +	output.pointer = NULL;
> +	/*
> +	 * the function to submit TPM operation request to pre-os environment
> +	 * is updated with function index from SUBREQ to SUBREQ2 since PPI
> +	 * version 1.1
> +	 */
> +	if (strcmp(version, "1.1") == -1)
> +		params[2].integer.value = TPM_PPI_FN_SUBREQ;
> +	else
> +		params[2].integer.value = TPM_PPI_FN_SUBREQ2;
> +	/*
> +	 * PPI spec defines params[3].type as ACPI_TYPE_PACKAGE. Some BIOS
> +	 * accept buffer/string/integer type, but some BIOS accept buffer/
> +	 * string/package type. For PPI version 1.0 and 1.1, use buffer type
> +	 * for compatibility, and use package type since 1.2 according to spec.
> +	 */
> +	if (strcmp(version, "1.2") == -1) {
> +		params[3].type = ACPI_TYPE_BUFFER;
> +		params[3].buffer.length = sizeof(req);
> +		sscanf(buf, "%d", &req);
> +		params[3].buffer.pointer = (char *)&req;
> +	} else {
> +		params[3].package.count = 1;
> +		obj.type = ACPI_TYPE_INTEGER;
> +		sscanf(buf, "%llu", &obj.integer.value);
> +		params[3].package.elements = &obj;
> +	}
> +
> +	status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
> +					    ACPI_TYPE_INTEGER);
> +	if (ACPI_FAILURE(status))
> +		return -ENOMEM;
> +	ret = ((union acpi_object *)output.pointer)->integer.value;
> +	if (ret == 0)
> +		status = (acpi_status)count;
> +	else if (ret == 1)
> +		status = -EPERM;
> +	else
> +		status = -EFAULT;
> +	kfree(output.pointer);
> +	return status;
> +}
> +
> +ssize_t tpm_show_ppi_transition_action(struct device *dev,
> +				       struct device_attribute *attr,
> +				       char *buf)
> +{
> +	char version[PPI_VERSION_LEN + 1];
> +	acpi_handle handle;
> +	acpi_status status;
> +	struct acpi_object_list input;
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	union acpi_object params[4];
> +	u32 ret;
> +	char *info[] = {
> +		"None",
> +		"Shutdown",
> +		"Reboot",
> +		"OS Vendor-specific",
> +		"Error",
> +	};
> +	input.count = 4;
> +	ppi_assign_params(params, TPM_PPI_FN_VERSION);
> +	input.pointer = params;
> +	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
> +				     ACPI_UINT32_MAX, ppi_callback, NULL,
> +				     tpm_device_name, &handle);
> +	if (ACPI_FAILURE(status))
> +		return -ENXIO;
> +
> +	status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
> +					    ACPI_TYPE_STRING);
> +	if (ACPI_FAILURE(status))
> +		return -ENOMEM;
> +	strncpy(version,
> +		((union acpi_object *)output.pointer)->string.pointer,
> +		PPI_VERSION_LEN);
> +	/*
> +	 * PPI spec defines params[3].type as empty package, but some platforms
> +	 * (e.g. Capella with PPI 1.0) need integer/string/buffer type, so for
> +	 * compatibility, define params[3].type as buffer, if PPI version < 1.2
> +	 */
> +	if (strcmp(version, "1.2") == -1) {
> +		params[3].type = ACPI_TYPE_BUFFER;
> +		params[3].buffer.length =  0;
> +		params[3].buffer.pointer = NULL;
> +	}
> +	params[2].integer.value = TPM_PPI_FN_GETACT;
> +	kfree(output.pointer);
> +	output.length = ACPI_ALLOCATE_BUFFER;
> +	output.pointer = NULL;
> +	status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
> +					    ACPI_TYPE_INTEGER);
> +	if (ACPI_FAILURE(status))
> +		return -ENOMEM;
> +	ret = ((union acpi_object *)output.pointer)->integer.value;
> +	if (ret < ARRAY_SIZE(info) - 1)
> +		status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret, info[ret]);
> +	else
> +		status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret,
> +				   info[ARRAY_SIZE(info)-1]);
> +	kfree(output.pointer);
> +	return status;
> +}
> +
> +ssize_t tpm_show_ppi_response(struct device *dev,
> +			      struct device_attribute *attr,
> +			      char *buf)
> +{
> +	acpi_handle handle;
> +	acpi_status status;
> +	struct acpi_object_list input;
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	union acpi_object params[4];
> +	union acpi_object *ret_obj;
> +	u64 req;
> +
> +	input.count = 4;
> +	ppi_assign_params(params, TPM_PPI_FN_GETRSP);
> +	input.pointer = params;
> +	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
> +				     ACPI_UINT32_MAX, ppi_callback, NULL,
> +				     tpm_device_name, &handle);
> +	if (ACPI_FAILURE(status))
> +		return -ENXIO;
> +
> +	status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
> +					    ACPI_TYPE_PACKAGE);
> +	if (ACPI_FAILURE(status))
> +		return -ENOMEM;
> +	/*
> +	 * parameter output.pointer should be of package type, including
> +	 * 3 integers. The first means function return code, the second means
> +	 * most recent TPM operation request, and the last means response to
> +	 * the most recent TPM operation request. Only if the first is 0, and
> +	 * the second integer is not 0, the response makes sense.
> +	 */
> +	ret_obj = ((union acpi_object *)output.pointer)->package.elements;
> +	if (ret_obj->type != ACPI_TYPE_INTEGER) {
> +		status = -EINVAL;
> +		goto cleanup;
> +	}
> +	if (ret_obj->integer.value) {
> +		status = -EFAULT;
> +		goto cleanup;
> +	}
> +	ret_obj++;
> +	if (ret_obj->type != ACPI_TYPE_INTEGER) {
> +		status = -EINVAL;
> +		goto cleanup;
> +	}
> +	if (ret_obj->integer.value) {
> +		req = ret_obj->integer.value;
> +		ret_obj++;
> +		if (ret_obj->type != ACPI_TYPE_INTEGER) {
> +			status = -EINVAL;
> +			goto cleanup;
> +		}
> +		if (ret_obj->integer.value == 0)
> +			status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
> +					   "0: Success");
> +		else if (ret_obj->integer.value == 0xFFFFFFF0)
> +			status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
> +					   "0xFFFFFFF0: User Abort");
> +		else if (ret_obj->integer.value == 0xFFFFFFF1)
> +			status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
> +					   "0xFFFFFFF1: BIOS Failure");
> +		else if (ret_obj->integer.value >= 1 &&
> +			 ret_obj->integer.value <= 0x00000FFF)
> +			status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
> +					   req, ret_obj->integer.value,
> +					   "Corresponding TPM error");
> +		else
> +			status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
> +					   req, ret_obj->integer.value,
> +					   "Error");
> +	} else {
> +		status = scnprintf(buf, PAGE_SIZE, "%llu: %s\n",
> +				   ret_obj->integer.value, "No Recent Request");
> +	}
> +cleanup:
> +	kfree(output.pointer);
> +	return status;
> +}
> +
> +static ssize_t show_ppi_operations(char *buf, u32 start, u32 end)
> +{
> +	char *str = buf;
> +	char version[PPI_VERSION_LEN];
> +	acpi_handle handle;
> +	acpi_status status;
> +	struct acpi_object_list input;
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	union acpi_object params[4];
> +	union acpi_object obj;
> +	int i;
> +	u32 ret;
> +	char *info[] = {
> +		"Not implemented",
> +		"BIOS only",
> +		"Blocked for OS by BIOS",
> +		"User required",
> +		"User not required",
> +	};
> +	input.count = 4;
> +	ppi_assign_params(params, TPM_PPI_FN_VERSION);
> +	input.pointer = params;
> +	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
> +				     ACPI_UINT32_MAX, ppi_callback, NULL,
> +				     tpm_device_name, &handle);
> +	if (ACPI_FAILURE(status))
> +		return -ENXIO;
> +
> +	status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
> +					 ACPI_TYPE_STRING);
> +	if (ACPI_FAILURE(status))
> +		return -ENOMEM;
> +
> +	strncpy(version,
> +		((union acpi_object *)output.pointer)->string.pointer,
> +		PPI_VERSION_LEN);
> +	kfree(output.pointer);
> +	output.length = ACPI_ALLOCATE_BUFFER;
> +	output.pointer = NULL;
> +	if (strcmp(version, "1.2") == -1)
> +		return -EPERM;
> +
> +	params[2].integer.value = TPM_PPI_FN_GETOPR;
> +	params[3].package.count = 1;
> +	obj.type = ACPI_TYPE_INTEGER;
> +	params[3].package.elements = &obj;
> +	for (i = start; i <= end; i++) {
> +		obj.integer.value = i;
> +		status = acpi_evaluate_object_typed(handle, "_DSM",
> +			 &input, &output, ACPI_TYPE_INTEGER);
> +		if (ACPI_FAILURE(status))
> +			return -ENOMEM;
> +
> +		ret = ((union acpi_object *)output.pointer)->integer.value;
> +		if (ret > 0 && ret < ARRAY_SIZE(info))
> +			str += scnprintf(str, PAGE_SIZE, "%d %d: %s\n",
> +					 i, ret, info[ret]);
> +		kfree(output.pointer);
> +		output.length = ACPI_ALLOCATE_BUFFER;
> +		output.pointer = NULL;
> +	}
> +	return str - buf;
> +}
> +
> +ssize_t tpm_show_ppi_tcg_operations(struct device *dev,
> +				   struct device_attribute *attr, char *buf)
> +{
> +	return show_ppi_operations(buf, 0, PPI_TPM_REQ_MAX);
> +}
> +
> +ssize_t tpm_show_ppi_vs_operations(struct device *dev,
> +				  struct device_attribute *attr, char *buf)
> +{
> +	return show_ppi_operations(buf, PPI_VS_REQ_START, PPI_VS_REQ_END);
> +}
> +
> +static DEVICE_ATTR(version, S_IRUGO, tpm_show_ppi_version, NULL);
> +static DEVICE_ATTR(request, S_IRUGO | S_IWUSR | S_IWGRP,
> +		   tpm_show_ppi_request, tpm_store_ppi_request);
> +static DEVICE_ATTR(transition_action, S_IRUGO,
> +		   tpm_show_ppi_transition_action, NULL);
> +static DEVICE_ATTR(response, S_IRUGO, tpm_show_ppi_response, NULL);
> +static DEVICE_ATTR(tcg_operations, S_IRUGO, tpm_show_ppi_tcg_operations, NULL);
> +static DEVICE_ATTR(vs_operations, S_IRUGO, tpm_show_ppi_vs_operations, NULL);
> +
> +static struct attribute *ppi_attrs[] = {
> +	&dev_attr_version.attr,
> +	&dev_attr_request.attr,
> +	&dev_attr_transition_action.attr,
> +	&dev_attr_response.attr,
> +	&dev_attr_tcg_operations.attr,
> +	&dev_attr_vs_operations.attr, NULL,
> +};
> +struct attribute_group ppi_attr_grp = {
> +	.attrs = ppi_attrs
> +};
> +EXPORT_SYMBOL_GPL(ppi_attr_grp);
> +
> +MODULE_LICENSE("GPL");


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