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agp/intel: Flush chipset writes after updating a single PTE 

After we update one PTE for a page, the caller expects to be able to
immediately use that through a GGTT read/write. To comply with the
callers expectations we therefore need to flush the chipset buffers
before returning.

Reported-by: Matti Hämäläinen <ccr@tnsp.org>
Fixes: d6473f5664 ("drm/i915: Add support for mapping an object page...")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ankitprasad Sharma <ankitprasad.r.sharma@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Tested-by: Matti Hämäläinen <ccr@tnsp.org>
Cc: drm-intel-fixes@lists.freedesktop.org
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160818161718.27187-2-chris@chris-wilson.co.uk
hifive-unleashed-5.1
Chris Wilson 2016-08-18 17:16:41 +01:00
parent 600f436801
commit 3497971a71
1 changed files with 2 additions and 0 deletions
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2
drivers/char/agp/intel-gtt.c
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@ -845,6 +845,8 @@ void intel_gtt_insert_page(dma_addr_t addr,
unsigned int flags)
{
intel_private.driver->write_entry(addr, pg, flags);
if (intel_private.driver->chipset_flush)
intel_private.driver->chipset_flush();
}
EXPORT_SYMBOL(intel_gtt_insert_page);