From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joonas Lahtinen Subject: [PATCH v2 1/2] drm/i915: Prevent a race during I915_GEM_MMAP ioctl with WC set Date: Tue, 29 Jan 2019 18:12:36 +0200 Message-ID: <20190129161237.30295-1-joonas.lahtinen@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by gabe.freedesktop.org (Postfix) with ESMTPS id D880F6E567 for ; Tue, 29 Jan 2019 16:12:44 +0000 (UTC) List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Intel graphics driver community testing & development List-Id: intel-gfx@lists.freedesktop.org TWFrZSBzdXJlIHRoZSB1bmRlcmx5aW5nIFZNQSBpbiB0aGUgcHJvY2VzcyBhZGRyZXNzIHNwYWNl IGlzIHRoZQpzYW1lIGFzIGl0IHdhcyBkdXJpbmcgdm1fbW1hcCB0byBhdm9pZCBhcHBseWluZyBX QyB0byB3cm9uZyBWTUEuCgpBIG1vcmUgbG9uZy10ZXJtIHNvbHV0aW9uIHdvdWxkIGJlIHRvIGhh dmUgdm1fbW1hcF9sb2NrZWQgdmFyaWFudAppbiBsaW51eC9tbWFwLmggZm9yIHdoZW4gY2FsbGVy IHdhbnRzIHRvIGhvbGQgbW1hcF9zZW0gZm9yIGFuCmV4dGVuZGVkIGR1cmF0aW9uLgoKdjI6Ci0g UmVmYWN0b3IgdGhlIGNvbXBhcmUgZnVuY3Rpb24KCkZpeGVzOiAxODE2ZjkyMzYzMDMgKCJkcm0v aTkxNTogU3VwcG9ydCBjcmVhdGlvbiBvZiB1bmJvdW5kIHdjIHVzZXIgbWFwcGluZ3MgZm9yIG9i amVjdHMiKQpSZXBvcnRlZC1ieTogQWRhbSBaYWJyb2NraSA8YWRhbXphQG1pY3Jvc29mdC5jb20+ ClN1Z2dlc3RlZC1ieTogTGludXMgVG9ydmFsZHMgPHRvcnZhbGRzQGxpbnV4LWZvdW5kYXRpb24u b3JnPgpTaWduZWQtb2ZmLWJ5OiBKb29uYXMgTGFodGluZW4gPGpvb25hcy5sYWh0aW5lbkBsaW51 eC5pbnRlbC5jb20+CkNjOiA8c3RhYmxlQHZnZXIua2VybmVsLm9yZz4gIyB2NC4wKwpDYzogQWth c2ggR29lbCA8YWthc2guZ29lbEBpbnRlbC5jb20+CkNjOiBDaHJpcyBXaWxzb24gPGNocmlzQGNo cmlzLXdpbHNvbi5jby51az4KQ2M6IFR2cnRrbyBVcnN1bGluIDx0dnJ0a28udXJzdWxpbkBsaW51 eC5pbnRlbC5jb20+CkNjOiBBZGFtIFphYnJvY2tpIDxhZGFtemFAbWljcm9zb2Z0LmNvbT4KUmV2 aWV3ZWQtYnk6IENocmlzIFdpbHNvbiA8Y2hyaXNAY2hyaXMtd2lsc29uLmNvLnVrPiAjdjEKUmV2 aWV3ZWQtYnk6IFR2cnRrbyBVcnN1bGluIDx0dnJ0a28udXJzdWxpbkBpbnRlbC5jb20+ICN2MQot LS0KIGRyaXZlcnMvZ3B1L2RybS9pOTE1L2k5MTVfZ2VtLmMgfCAxMiArKysrKysrKysrKy0KIDEg ZmlsZSBjaGFuZ2VkLCAxMSBpbnNlcnRpb25zKCspLCAxIGRlbGV0aW9uKC0pCgpkaWZmIC0tZ2l0 IGEvZHJpdmVycy9ncHUvZHJtL2k5MTUvaTkxNV9nZW0uYyBiL2RyaXZlcnMvZ3B1L2RybS9pOTE1 L2k5MTVfZ2VtLmMKaW5kZXggMDU2MjcwMDBiNzdkLi43Y2E3OGMwNmIyMmMgMTAwNjQ0Ci0tLSBh L2RyaXZlcnMvZ3B1L2RybS9pOTE1L2k5MTVfZ2VtLmMKKysrIGIvZHJpdmVycy9ncHUvZHJtL2k5 MTUvaTkxNV9nZW0uYwpAQCAtMTY4MSw2ICsxNjgxLDE2IEBAIGk5MTVfZ2VtX3N3X2ZpbmlzaF9p b2N0bChzdHJ1Y3QgZHJtX2RldmljZSAqZGV2LCB2b2lkICpkYXRhLAogCXJldHVybiAwOwogfQog CitzdGF0aWMgaW5saW5lIGJvb2wKK19fdm1hX21hdGNoZXMoc3RydWN0IHZtX2FyZWFfc3RydWN0 ICp2bWEsIHN0cnVjdCBmaWxlICpmaWxwLAorCSAgICAgIHVuc2lnbmVkIGxvbmcgYWRkciwgdW5z aWduZWQgbG9uZyBzaXplKQoreworCWlmICh2bWEtPnZtX2ZpbGUgIT0gZmlscCkKKwkJcmV0dXJu IGZhbHNlOworCisJcmV0dXJuIHZtYS0+dm1fc3RhcnQgPT0gYWRkciAmJiAodm1hLT52bV9lbmQg LSB2bWEtPnZtX3N0YXJ0KSA9PSBzaXplOworfQorCiAvKioKICAqIGk5MTVfZ2VtX21tYXBfaW9j dGwgLSBNYXBzIHRoZSBjb250ZW50cyBvZiBhbiBvYmplY3QsIHJldHVybmluZyB0aGUgYWRkcmVz cwogICoJCQkgaXQgaXMgbWFwcGVkIHRvLgpAQCAtMTczOSw3ICsxNzQ5LDcgQEAgaTkxNV9nZW1f bW1hcF9pb2N0bChzdHJ1Y3QgZHJtX2RldmljZSAqZGV2LCB2b2lkICpkYXRhLAogCQkJcmV0dXJu IC1FSU5UUjsKIAkJfQogCQl2bWEgPSBmaW5kX3ZtYShtbSwgYWRkcik7Ci0JCWlmICh2bWEpCisJ CWlmICh2bWEgJiYgX192bWFfbWF0Y2hlcyh2bWEsIG9iai0+YmFzZS5maWxwLCBhZGRyLCBhcmdz LT5zaXplKSkKIAkJCXZtYS0+dm1fcGFnZV9wcm90ID0KIAkJCQlwZ3Byb3Rfd3JpdGVjb21iaW5l KHZtX2dldF9wYWdlX3Byb3Qodm1hLT52bV9mbGFncykpOwogCQllbHNlCi0tIAoyLjE3LjIKCl9f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCkludGVsLWdmeCBt YWlsaW5nIGxpc3QKSW50ZWwtZ2Z4QGxpc3RzLmZyZWVkZXNrdG9wLm9yZwpodHRwczovL2xpc3Rz LmZyZWVkZXNrdG9wLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2ludGVsLWdmeAo=