From mboxrd@z Thu Jan 1 00:00:00 1970 From: jeff.mcgee@intel.com Subject: [RFC 7/8] drm/i915: Skip CSB processing on invalid CSB tail Date: Wed, 21 Mar 2018 10:26:24 -0700 Message-ID: <20180321172625.6415-8-jeff.mcgee@intel.com> References: <20180321172625.6415-1-jeff.mcgee@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by gabe.freedesktop.org (Postfix) with ESMTPS id E99186E964 for ; Wed, 21 Mar 2018 17:41:19 +0000 (UTC) In-Reply-To: <20180321172625.6415-1-jeff.mcgee@intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: intel-gfx@lists.freedesktop.org Cc: ben@bwidawsk.net, kalyan.kondapally@intel.com List-Id: intel-gfx@lists.freedesktop.org RnJvbTogSmVmZiBNY0dlZSA8amVmZi5tY2dlZUBpbnRlbC5jb20+CgpFbmdpbmUgcmVzZXQgaXMg ZmFzdC4gQSBjb250ZXh0IHN3aXRjaCBpbnRlcnJ1cHQgbWF5IGJlIGdlbmVyYXRlZCBqdXN0CnBy aW9yIHRvIHRoZSByZXNldCBzdWNoIHRoYXQgdGhlIHRvcCBoYWxmIGhhbmRsZXIgaXMgcmFjaW5n IHdpdGggcmVzZXQKcG9zdC1wcm9jZXNzaW5nLiBUaGUgaGFuZGxlciBtYXkgc2V0IHRoZSBpcnFf cG9zdGVkIGJpdCBhZ2FpbiBhZnRlcgp0aGUgcmVzZXQgY29kZSBoYXMgY2xlYXJlZCBpdCB0byBz dGFydCBmcmVzaC4gVGhlbiB0aGUgcmUtZW5hYmxlZAp0YXNrbGV0IHdpbGwgcmVhZCB0aGUgQ1NC IGhlYWQgYW5kIHRhaWwgZnJvbSBNTUlPLCB3aGljaCB3aWxsIGJlIGF0CnRoZSBoYXJkd2FyZSBy ZXNldCB2YWx1ZXMgb2YgMCBhbmQgNyByZXNwZWN0aXZlbHksIGdpdmVuIHRoYXQgbm8KYWN0dWFs IENTQiBldmVudCBoYXMgb2NjdXJyZWQgc2luY2UgdGhlIHJlc2V0LiBNYXloZW0gdGhlbiBlbnN1 ZXMgYXMKdGhlIHRhc2tsZXQgc3RhcnRzIHByb2Nlc3NpbmcgaW52YWxpZCBDU0IgZW50cmllcy4K CldlIGNhbiBoYW5kbGUgdGhpcyBjb3JuZXIgY2FzZSB3aXRob3V0IGFkZGluZyBhbnkgbmV3IHN5 bmNocm9uaXphdGlvbgpiZXR3ZWVuIHRoZSBpcnEgdG9wIGhhbGYgYW5kIHRoZSByZXNldCB3b3Jr IGl0ZW0uIFRoZSB0YXNrbGV0IGNhbgpqdXN0IHNraXAgQ1NCIHByb2Nlc3NpbmcgaWYgdGhlIHRh aWwgaXMgbm90IHNhbmUuCgpTaWduZWQtb2ZmLWJ5OiBKZWZmIE1jR2VlIDxqZWZmLm1jZ2VlQGlu dGVsLmNvbT4KLS0tCiBkcml2ZXJzL2dwdS9kcm0vaTkxNS9pbnRlbF9scmMuYyB8IDExICsrKysr KysrKystCiAxIGZpbGUgY2hhbmdlZCwgMTAgaW5zZXJ0aW9ucygrKSwgMSBkZWxldGlvbigtKQoK ZGlmZiAtLWdpdCBhL2RyaXZlcnMvZ3B1L2RybS9pOTE1L2ludGVsX2xyYy5jIGIvZHJpdmVycy9n cHUvZHJtL2k5MTUvaW50ZWxfbHJjLmMKaW5kZXggY2VjNGUxNjUzZGFmLi5kNDIwYzJlY2I1MGEg MTAwNjQ0Ci0tLSBhL2RyaXZlcnMvZ3B1L2RybS9pOTE1L2ludGVsX2xyYy5jCisrKyBiL2RyaXZl cnMvZ3B1L2RybS9pOTE1L2ludGVsX2xyYy5jCkBAIC04NjUsNiArODY1LDE0IEBAIHN0YXRpYyB2 b2lkIHByb2Nlc3NfY3NiKHN0cnVjdCBpbnRlbF9lbmdpbmVfY3MgKmVuZ2luZSkKIAkJaGVhZCA9 IHJlYWRsKGk5MTUtPnJlZ3MgKyBpOTE1X21taW9fcmVnX29mZnNldChSSU5HX0NPTlRFWFRfU1RB VFVTX1BUUihlbmdpbmUpKSk7CiAJCXRhaWwgPSBHRU44X0NTQl9XUklURV9QVFIoaGVhZCk7CiAJ CWhlYWQgPSBHRU44X0NTQl9SRUFEX1BUUihoZWFkKTsKKworCQkvKiBUaGUgTU1JTyByZWFkIENT QiB0YWlsIG1heSBiZSBhdCB0aGUgcmVzZXQgdmFsdWUgb2YKKwkJICogMHg3IGlmIHRoZXJlIGhh c24ndCBiZWVuIGEgdmFsaWQgQ1NCIGV2ZW50IHNpbmNlCisJCSAqIHRoZSBlbmdpbmUgcmVzZXQu CisJCSAqLworCQlpZiAodGFpbCA+PSBHRU44X0NTQl9FTlRSSUVTKQorCQkJZ290byBvdXQ7CisK IAkJZXhlY2xpc3RzLT5jc2JfaGVhZCA9IGhlYWQ7CiAJfSBlbHNlIHsKIAkJY29uc3QgaW50IHdy aXRlX2lkeCA9CkBAIC04NzMsNiArODgxLDcgQEAgc3RhdGljIHZvaWQgcHJvY2Vzc19jc2Ioc3Ry dWN0IGludGVsX2VuZ2luZV9jcyAqZW5naW5lKQogCiAJCWhlYWQgPSBleGVjbGlzdHMtPmNzYl9o ZWFkOwogCQl0YWlsID0gUkVBRF9PTkNFKGJ1Zlt3cml0ZV9pZHhdKTsKKwkJR0VNX0JVR19PTih0 YWlsID49IEdFTjhfQ1NCX0VOVFJJRVMpOwogCX0KIAlHRU1fVFJBQ0UoIiVzIGNzLWlycSBoZWFk PSVkIFslZCVzXSwgdGFpbD0lZCBbJWQlc11cbiIsCiAJCSAgZW5naW5lLT5uYW1lLApAQCAtOTgx LDcgKzk5MCw3IEBAIHN0YXRpYyB2b2lkIHByb2Nlc3NfY3NiKHN0cnVjdCBpbnRlbF9lbmdpbmVf Y3MgKmVuZ2luZSkKIAkJd3JpdGVsKF9NQVNLRURfRklFTEQoR0VOOF9DU0JfUkVBRF9QVFJfTUFT SywgaGVhZCA8PCA4KSwKIAkJICAgICAgIGk5MTUtPnJlZ3MgKyBpOTE1X21taW9fcmVnX29mZnNl dChSSU5HX0NPTlRFWFRfU1RBVFVTX1BUUihlbmdpbmUpKSk7CiAJfQotCitvdXQ6CiAJaWYgKHVu bGlrZWx5KGZ3KSkKIAkJaW50ZWxfdW5jb3JlX2ZvcmNld2FrZV9wdXQoaTkxNSwgZXhlY2xpc3Rz LT5md19kb21haW5zKTsKIH0KLS0gCjIuMTYuMgoKX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX18KSW50ZWwtZ2Z4IG1haWxpbmcgbGlzdApJbnRlbC1nZnhAbGlz dHMuZnJlZWRlc2t0b3Aub3JnCmh0dHBzOi8vbGlzdHMuZnJlZWRlc2t0b3Aub3JnL21haWxtYW4v bGlzdGluZm8vaW50ZWwtZ2Z4Cg==