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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2007-11-04 22:05:49 -0500
committerJeff Garzik <jeff@garzik.org>2008-01-23 05:24:09 -0500
commitae8d4ee7ff429136c8b482c3b38ed994c021d3fc (patch)
treebf45047ab8a4f5325c6b752be02313d3112eded0 /drivers/ata/libata.h
parentffe188dd83e84119516688c822388c8f30a54877 (diff)
libata: Disable ATA8-ACS proposed Trusted Computing features by default
Historically word 48 in the identify data was used to mean 32bit I/O was supported for VLB IDE etc. ATA8 reassigns this word to the Trusted Computing Group, where it is used for TCG features. This means that an ATA8 TCG drive is going to trigger 32bit I/O on some systems which will be funny. Anyway we need to sort this out ready for ATA8 so: - Reorder the ata.h header a bit so the ata_version function occurs early in it - Make dword_io check the ATA version - Add an ATA8 version checking TCG presence test While we are at it the current drafts have a flaw where it may not be possible to disable TCG features at boot (and opt out of the trusted model) as TCG intends because it relies on presence of a different optional feature (DCS). Handle this in software by refusing the TCG commands if libata.allow_tpm is not set. (We must make it possible as some environments such as proprietary VDR devices will doubtless want to use it to lock up content) Finally as with CPRM print a warning so that the user knows they may not be able to full access and use the device. Signed-off-by: Alan Cox <alan@redhat.com>
Diffstat (limited to 'drivers/ata/libata.h')
-rw-r--r--drivers/ata/libata.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index bbe59c2fd1e..048e26cfb33 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -60,6 +60,7 @@ extern int atapi_dmadir;
extern int atapi_passthru16;
extern int libata_fua;
extern int libata_noacpi;
+extern int libata_allow_tpm;
extern struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev);
extern int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
u64 block, u32 n_block, unsigned int tf_flags,