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| author | Keir Fraser <keir@xen.org> | 2011-02-09 08:40:05 +0000 |
|---|---|---|
| committer | Keir Fraser <keir@xen.org> | 2011-02-09 08:40:05 +0000 |
| commit | f4b185362da47e1d9189ed3eb73cd8eca80c364e (patch) | |
| tree | 6ff3fe9061048b6255fee5e89e7a63f9d840ef56 | |
| parent | 31960417a919c6d883547e1f6c73bd90f0d2ef03 (diff) | |
| download | xen-f4b185362da47e1d9189ed3eb73cd8eca80c364e.tar.gz xen-f4b185362da47e1d9189ed3eb73cd8eca80c364e.tar.bz2 xen-f4b185362da47e1d9189ed3eb73cd8eca80c364e.zip | |
[VTD][QUIRK] add spin lock across snb pre/postamble functions
Added a spinlock across snb_vtd_ops_preamble() and
snb_vtd_ops_postamble() to make modifications to IGD registers atomic.
Continue keeping snb_igd_quirk default off.
Signed-off-by: Allen Kay <allen.m.kay@intel.com>
| -rw-r--r-- | xen/drivers/passthrough/vtd/quirks.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/xen/drivers/passthrough/vtd/quirks.c b/xen/drivers/passthrough/vtd/quirks.c index ef6c8d0f29..0f7db71443 100644 --- a/xen/drivers/passthrough/vtd/quirks.c +++ b/xen/drivers/passthrough/vtd/quirks.c @@ -55,6 +55,7 @@ bool_t rwbf_quirk; static int is_cantiga_b3; static int is_snb_gfx; static u8 *igd_reg_va; +static spinlock_t igd_lock; /* * QUIRK to workaround Xen boot issue on Calpella/Ironlake OEM BIOS @@ -98,6 +99,7 @@ static void cantiga_b3_errata_init(void) static void snb_errata_init(void) { is_snb_gfx = IS_SNB_GFX(igd_id); + spin_lock_init(&igd_lock); } /* @@ -225,7 +227,12 @@ void vtd_ops_preamble_quirk(struct iommu* iommu) { cantiga_vtd_ops_preamble(iommu); if ( snb_igd_quirk ) + { + spin_lock(&igd_lock); + + /* match unlock in postamble */ snb_vtd_ops_preamble(iommu); + } } /* @@ -234,7 +241,12 @@ void vtd_ops_preamble_quirk(struct iommu* iommu) void vtd_ops_postamble_quirk(struct iommu* iommu) { if ( snb_igd_quirk ) + { snb_vtd_ops_postamble(iommu); + + /* match the lock in preamble */ + spin_unlock(&igd_lock); + } } /* initialize platform identification flags */ |