From mboxrd@z Thu Jan  1 00:00:00 1970
From: ville.syrjala@linux.intel.com
Subject: [PATCH v3] drm/i915: Don't allow ring tail to reach the
	same cacheline as head
Date: Mon,  3 Dec 2012 18:43:32 +0200
Message-ID: <1354553012-31964-1-git-send-email-ville.syrjala@linux.intel.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org>
Received: from mga02.intel.com (mga02.intel.com [134.134.136.20])
	by gabe.freedesktop.org (Postfix) with ESMTP id 1A982E5C77
	for <intel-gfx@lists.freedesktop.org>;
	Mon,  3 Dec 2012 08:43:38 -0800 (PST)
List-Unsubscribe: <http://lists.freedesktop.org/mailman/options/intel-gfx>,
	<mailto:intel-gfx-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <http://lists.freedesktop.org/archives/intel-gfx>
List-Post: <mailto:intel-gfx@lists.freedesktop.org>
List-Help: <mailto:intel-gfx-request@lists.freedesktop.org?subject=help>
List-Subscribe: <http://lists.freedesktop.org/mailman/listinfo/intel-gfx>,
	<mailto:intel-gfx-request@lists.freedesktop.org?subject=subscribe>
Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org
Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org
To: intel-gfx@lists.freedesktop.org
List-Id: intel-gfx@lists.freedesktop.org

RnJvbTogVmlsbGUgU3lyasOkbMOkIDx2aWxsZS5zeXJqYWxhQGxpbnV4LmludGVsLmNvbT4KCkZy
b20gQlNwZWM6CiJJZiB0aGUgUmluZyBCdWZmZXIgSGVhZCBQb2ludGVyIGFuZCB0aGUgVGFpbCBQ
b2ludGVyIGFyZSBvbiB0aGUgc2FtZQpjYWNoZWxpbmUsIHRoZSBIZWFkIFBvaW50ZXIgbXVzdCBu
b3QgYmUgZ3JlYXRlciB0aGFuIHRoZSBUYWlsClBvaW50ZXIuIgoKVGhlIGVhc2llc3Qgd2F5IHRv
IGVuZm9yY2UgdGhpcyBpcyB0byByZWR1Y2UgdGhlIHJlcG9ydGVkIHJpbmcgc3BhY2UuCgpSZWZl
cmVuY2VzOgpHZW4yIEJTcGVjICIxLiBQcm9ncmFtbWluZyBFbnZpcm9ubWVudCIgLyAxLjQuNC42
ICJSaW5nIEJ1ZmZlciBVc2UiCkdlbjMgQlNwZWMgInZvbDFjIE1lbW9yeSBJbnRlcmZhY2UgRnVu
Y3Rpb25zIiAvIDIuMy40LjUgIlJpbmcgQnVmZmVyIFVzZSIKR2VuNCsgQlNwZWMgInZvbDFjIE1l
bW9yeSBJbnRlcmZhY2UgYW5kIENvbW1hbmQgU3RyZWFtIiAvIDUuMy40LjUgIlJpbmcgQnVmZmVy
IFVzZSIKCnYyOiBJbmNsdWRlIHRoZSBleGFjdCBCU3BlYyByZWZlcmVuY2VzIGluIHRoZSBkZXNj
cmlwdGlvbgoKdjM6IHMvNjQvSTkxNV9SSU5HX0ZSRUVfU1BBQ0UsIGFuZCBhZGQgdGhlIEJTcGVj
IGluZm9ybWF0aW9uIHRvIHRoZSBjb2RlCgpTaWduZWQtb2ZmLWJ5OiBWaWxsZSBTeXJqw6Rsw6Qg
PHZpbGxlLnN5cmphbGFAbGludXguaW50ZWwuY29tPgpSZXZpZXdlZC1ieTogQ2hyaXMgV2lsc29u
IDxjaHJpc0BjaHJpcy13aWxzb24uY28udWs+Ci0tLQpJIHJlYmFzZWQgdGhpcyBvbiB0b3Agb2Yg
ZHJtLWludGVsLW5leHQuCgogZHJpdmVycy9ncHUvZHJtL2k5MTUvaTkxNV9kbWEuYyAgICAgICAg
IHwgICAgMiArLQogZHJpdmVycy9ncHUvZHJtL2k5MTUvaW50ZWxfcmluZ2J1ZmZlci5jIHwgICAg
NCArKy0tCiBkcml2ZXJzL2dwdS9kcm0vaTkxNS9pbnRlbF9yaW5nYnVmZmVyLmggfCAgIDExICsr
KysrKysrKysrCiAzIGZpbGVzIGNoYW5nZWQsIDE0IGluc2VydGlvbnMoKyksIDMgZGVsZXRpb25z
KC0pCgpkaWZmIC0tZ2l0IGEvZHJpdmVycy9ncHUvZHJtL2k5MTUvaTkxNV9kbWEuYyBiL2RyaXZl
cnMvZ3B1L2RybS9pOTE1L2k5MTVfZG1hLmMKaW5kZXggMjYzNWVlNi4uYTMzM2QxZCAxMDA2NDQK
LS0tIGEvZHJpdmVycy9ncHUvZHJtL2k5MTUvaTkxNV9kbWEuYworKysgYi9kcml2ZXJzL2dwdS9k
cm0vaTkxNS9pOTE1X2RtYS5jCkBAIC0xNDEsNyArMTQxLDcgQEAgdm9pZCBpOTE1X2tlcm5lbF9s
b3N0X2NvbnRleHQoc3RydWN0IGRybV9kZXZpY2UgKiBkZXYpCiAKIAlyaW5nLT5oZWFkID0gSTkx
NV9SRUFEX0hFQUQocmluZykgJiBIRUFEX0FERFI7CiAJcmluZy0+dGFpbCA9IEk5MTVfUkVBRF9U
QUlMKHJpbmcpICYgVEFJTF9BRERSOwotCXJpbmctPnNwYWNlID0gcmluZy0+aGVhZCAtIChyaW5n
LT50YWlsICsgOCk7CisJcmluZy0+c3BhY2UgPSByaW5nLT5oZWFkIC0gKHJpbmctPnRhaWwgKyBJ
OTE1X1JJTkdfRlJFRV9TUEFDRSk7CiAJaWYgKHJpbmctPnNwYWNlIDwgMCkKIAkJcmluZy0+c3Bh
Y2UgKz0gcmluZy0+c2l6ZTsKIApkaWZmIC0tZ2l0IGEvZHJpdmVycy9ncHUvZHJtL2k5MTUvaW50
ZWxfcmluZ2J1ZmZlci5jIGIvZHJpdmVycy9ncHUvZHJtL2k5MTUvaW50ZWxfcmluZ2J1ZmZlci5j
CmluZGV4IDM2ZTFlMTNhLi40MDJhMGQ3IDEwMDY0NAotLS0gYS9kcml2ZXJzL2dwdS9kcm0vaTkx
NS9pbnRlbF9yaW5nYnVmZmVyLmMKKysrIGIvZHJpdmVycy9ncHUvZHJtL2k5MTUvaW50ZWxfcmlu
Z2J1ZmZlci5jCkBAIC00NSw3ICs0NSw3IEBAIHN0cnVjdCBwaXBlX2NvbnRyb2wgewogCiBzdGF0
aWMgaW5saW5lIGludCByaW5nX3NwYWNlKHN0cnVjdCBpbnRlbF9yaW5nX2J1ZmZlciAqcmluZykK
IHsKLQlpbnQgc3BhY2UgPSAocmluZy0+aGVhZCAmIEhFQURfQUREUikgLSAocmluZy0+dGFpbCAr
IDgpOworCWludCBzcGFjZSA9IChyaW5nLT5oZWFkICYgSEVBRF9BRERSKSAtIChyaW5nLT50YWls
ICsgSTkxNV9SSU5HX0ZSRUVfU1BBQ0UpOwogCWlmIChzcGFjZSA8IDApCiAJCXNwYWNlICs9IHJp
bmctPnNpemU7CiAJcmV0dXJuIHNwYWNlOwpAQCAtMTIzMSw3ICsxMjMxLDcgQEAgc3RhdGljIGlu
dCBpbnRlbF9yaW5nX3dhaXRfcmVxdWVzdChzdHJ1Y3QgaW50ZWxfcmluZ19idWZmZXIgKnJpbmcs
IGludCBuKQogCQlpZiAocmVxdWVzdC0+dGFpbCA9PSAtMSkKIAkJCWNvbnRpbnVlOwogCi0JCXNw
YWNlID0gcmVxdWVzdC0+dGFpbCAtIChyaW5nLT50YWlsICsgOCk7CisJCXNwYWNlID0gcmVxdWVz
dC0+dGFpbCAtIChyaW5nLT50YWlsICsgSTkxNV9SSU5HX0ZSRUVfU1BBQ0UpOwogCQlpZiAoc3Bh
Y2UgPCAwKQogCQkJc3BhY2UgKz0gcmluZy0+c2l6ZTsKIAkJaWYgKHNwYWNlID49IG4pIHsKZGlm
ZiAtLWdpdCBhL2RyaXZlcnMvZ3B1L2RybS9pOTE1L2ludGVsX3JpbmdidWZmZXIuaCBiL2RyaXZl
cnMvZ3B1L2RybS9pOTE1L2ludGVsX3JpbmdidWZmZXIuaAppbmRleCBkNGI3NDE2Li41MjYxODJl
IDEwMDY0NAotLS0gYS9kcml2ZXJzL2dwdS9kcm0vaTkxNS9pbnRlbF9yaW5nYnVmZmVyLmgKKysr
IGIvZHJpdmVycy9ncHUvZHJtL2k5MTUvaW50ZWxfcmluZ2J1ZmZlci5oCkBAIC0xLDYgKzEsMTcg
QEAKICNpZm5kZWYgX0lOVEVMX1JJTkdCVUZGRVJfSF8KICNkZWZpbmUgX0lOVEVMX1JJTkdCVUZG
RVJfSF8KIAorLyoKKyAqIEdlbjIgQlNwZWMgIjEuIFByb2dyYW1taW5nIEVudmlyb25tZW50IiAv
IDEuNC40LjYgIlJpbmcgQnVmZmVyIFVzZSIKKyAqIEdlbjMgQlNwZWMgInZvbDFjIE1lbW9yeSBJ
bnRlcmZhY2UgRnVuY3Rpb25zIiAvIDIuMy40LjUgIlJpbmcgQnVmZmVyIFVzZSIKKyAqIEdlbjQr
IEJTcGVjICJ2b2wxYyBNZW1vcnkgSW50ZXJmYWNlIGFuZCBDb21tYW5kIFN0cmVhbSIgLyA1LjMu
NC41ICJSaW5nIEJ1ZmZlciBVc2UiCisgKgorICogIklmIHRoZSBSaW5nIEJ1ZmZlciBIZWFkIFBv
aW50ZXIgYW5kIHRoZSBUYWlsIFBvaW50ZXIgYXJlIG9uIHRoZSBzYW1lCisgKiBjYWNoZWxpbmUs
IHRoZSBIZWFkIFBvaW50ZXIgbXVzdCBub3QgYmUgZ3JlYXRlciB0aGFuIHRoZSBUYWlsCisgKiBQ
b2ludGVyLiIKKyAqLworI2RlZmluZSBJOTE1X1JJTkdfRlJFRV9TUEFDRSA2NAorCiBzdHJ1Y3Qg
IGludGVsX2h3X3N0YXR1c19wYWdlIHsKIAl1MzIJCSpwYWdlX2FkZHI7CiAJdW5zaWduZWQgaW50
CWdmeF9hZGRyOwotLSAKMS43LjguNgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f
X19fX19fX19fX19fX18KSW50ZWwtZ2Z4IG1haWxpbmcgbGlzdApJbnRlbC1nZnhAbGlzdHMuZnJl
ZWRlc2t0b3Aub3JnCmh0dHA6Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5m
by9pbnRlbC1nZngK