On 8/29/17 6:42 AM, Christoph Hellwig wrote:
> ---
> From e661047ec3a25587648b07c02a687a7dac778f3b Mon Sep 17 00:00:00 2001
> From: Christoph Hellwig <hch@xxxxxx>
> Date: Tue, 29 Aug 2017 14:35:50 +0200
> Subject: libata: check for trusted computing in IDENTIFY DEVICE data
>
> ATA-8 and later mirrors the TRUSTED COMPUTING SUPPORTED bit in word 48 of
> the IDENTIFY DEVICE data. Check this before issuing a READ LOG PAGE
> command to avoid issues with buggy devices. The only downside is that
> we can't support Security Send / Receive for a device with an older
> revision due to the conflicting use of this field in earlier
> specifications.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
> drivers/ata/libata-core.c | 3 +++
> include/linux/ata.h | 10 +++++++++-
> 2 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
> index 697f5f896b19..ca57b03ab950 100644
> --- a/drivers/ata/libata-core.c
> +++ b/drivers/ata/libata-core.c
> @@ -2413,6 +2413,9 @@ static void ata_dev_config_trusted(struct ata_device *dev)
> u64 trusted_cap;
> unsigned int err;
>
> + if (!ata_id_has_trusted(dev->id))
> + return;
> +
> if (!ata_identify_page_supported(dev, ATA_LOG_SECURITY)) {
> ata_dev_warn(dev,
> "Security Log not supported\n");
> diff --git a/include/linux/ata.h b/include/linux/ata.h
> index e65ae4b2ed48..c7a353825450 100644
> --- a/include/linux/ata.h
> +++ b/include/linux/ata.h
> @@ -60,7 +60,8 @@ enum {
> ATA_ID_FW_REV = 23,
> ATA_ID_PROD = 27,
> ATA_ID_MAX_MULTSECT = 47,
> - ATA_ID_DWORD_IO = 48,
> + ATA_ID_DWORD_IO = 48, /* before ATA-8 */
> + ATA_ID_TRUSTED = 48, /* ATA-8 and later */
> ATA_ID_CAPABILITY = 49,
> ATA_ID_OLD_PIO_MODES = 51,
> ATA_ID_OLD_DMA_MODES = 52,
> @@ -889,6 +890,13 @@ static inline bool ata_id_has_dword_io(const u16 *id)
> return id[ATA_ID_DWORD_IO] & (1 << 0);
> }
>
> +static inline bool ata_id_has_trusted(const u16 *id)
> +{
> + if (ata_id_major_version(id) <= 7)
> + return false;
> + return id[ATA_ID_TRUSTED] & (1 << 0);
> +}
> +
> static inline bool ata_id_has_unload(const u16 *id)
> {
> if (ata_id_major_version(id) >= 7 &&
>
That works for me.
Tested-by: David Ahern <dsahern@xxxxxxxxx>
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