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tpm, tpm_tis: fix TPM 2.0 probing 

If during transmission system error was returned, the logic was to
incorrectly deduce that chip is a TPM 1.x chip. This patch fixes this
issue. Also, this patch changes probing so that message tag is used as the
measure for TPM 2.x, which should be much more stable. A separate function
called tpm2_probe() is encapsulated because it can be used with any
chipset.

Fixes: aec04cbdf7 ("tpm: TPM 2.0 FIFO Interface")
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
This commit is contained in:
Jarkko Sakkinen 2015-02-04 16:21:09 +02:00 committed by Peter Huewe
parent 74d6b3ceaa
commit 4d5f2051cd
3 changed files with 39 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/char/tpm/tpm.h
View File

@ -435,4 +435,5 @@ extern int tpm2_startup(struct tpm_chip *chip, u16 startup_type);
extern void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
extern unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *, u32);
extern int tpm2_do_selftest(struct tpm_chip *chip);
extern int tpm2_gen_interrupt(struct tpm_chip *chip, bool quiet);
extern int tpm2_gen_interrupt(struct tpm_chip *chip);
extern int tpm2_probe(struct tpm_chip *chip);

40
drivers/char/tpm/tpm2-cmd.c
View File

@ -601,20 +601,46 @@ EXPORT_SYMBOL_GPL(tpm2_do_selftest);
/**
* tpm2_gen_interrupt() - generate an interrupt
* @chip: TPM chip to use
* @quiet: surpress the error message
*
* 0 is returned when the operation is successful. If a negative number is
* returned it remarks a POSIX error code. If a positive number is returned
* it remarks a TPM error.
*/
int tpm2_gen_interrupt(struct tpm_chip *chip, bool quiet)
int tpm2_gen_interrupt(struct tpm_chip *chip)
{
const char *desc = NULL;
u32 dummy;
if (!quiet)
desc = "attempting to generate an interrupt";
return tpm2_get_tpm_pt(chip, TPM2_CAP_TPM_PROPERTIES, &dummy, desc);
return tpm2_get_tpm_pt(chip, 0x100, &dummy,
"attempting to generate an interrupt");
}
EXPORT_SYMBOL_GPL(tpm2_gen_interrupt);
/**
* tpm2_probe() - probe TPM 2.0
* @chip: TPM chip to use
*
* Send idempotent TPM 2.0 command and see whether TPM 2.0 chip replied based on
* the reply tag.
*/
int tpm2_probe(struct tpm_chip *chip)
{
struct tpm2_cmd cmd;
int rc;
cmd.header.in = tpm2_get_tpm_pt_header;
cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES);
cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(0x100);
cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1);
rc = tpm_transmit(chip, (const char *) &cmd, sizeof(cmd));
if (rc < 0)
return rc;
else if (rc < TPM_HEADER_SIZE)
return -EFAULT;
if (be16_to_cpu(cmd.header.out.tag) == TPM2_ST_NO_SESSIONS)
chip->flags |= TPM_CHIP_FLAG_TPM2;
return 0;
}
EXPORT_SYMBOL_GPL(tpm2_probe);

11
drivers/char/tpm/tpm_tis.c
View File

@ -642,12 +642,9 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
goto out_err;
}
/* Every TPM 2.x command has a higher ordinal than TPM 1.x commands.
* Therefore, we can use an idempotent TPM 2.x command to probe TPM 2.x.
*/
rc = tpm2_gen_interrupt(chip, true);
if (rc == 0 || rc == TPM2_RC_INITIALIZE)
chip->flags |= TPM_CHIP_FLAG_TPM2;
rc = tpm2_probe(chip);
if (rc)
goto out_err;
vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
chip->vendor.manufacturer_id = vendor;
@ -750,7 +747,7 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
/* Generate Interrupts */
if (chip->flags & TPM_CHIP_FLAG_TPM2)
tpm2_gen_interrupt(chip, false);
tpm2_gen_interrupt(chip);
else
tpm_gen_interrupt(chip);