From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joonas Lahtinen Subject: [CI v3 1/2] drm/i915: Prevent a race during I915_GEM_MMAP ioctl with WC set Date: Thu, 7 Feb 2019 10:54:53 +0200 Message-ID: <20190207085454.10598-1-joonas.lahtinen@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by gabe.freedesktop.org (Postfix) with ESMTPS id CB0B96EAD4 for ; Thu, 7 Feb 2019 08:54:57 +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 aWV3ZWQtYnk6IENocmlzIFdpbHNvbiA8Y2hyaXNAY2hyaXMtd2lsc29uLmNvLnVrPgpSZXZpZXdl ZC1ieTogVHZydGtvIFVyc3VsaW4gPHR2cnRrby51cnN1bGluQGludGVsLmNvbT4gI3YxCi0tLQog ZHJpdmVycy9ncHUvZHJtL2k5MTUvaTkxNV9nZW0uYyB8IDEyICsrKysrKysrKysrLQogMSBmaWxl IGNoYW5nZWQsIDExIGluc2VydGlvbnMoKyksIDEgZGVsZXRpb24oLSkKCmRpZmYgLS1naXQgYS9k cml2ZXJzL2dwdS9kcm0vaTkxNS9pOTE1X2dlbS5jIGIvZHJpdmVycy9ncHUvZHJtL2k5MTUvaTkx NV9nZW0uYwppbmRleCAwNWNlOTE3NmFjNGUuLjUyNjM5Zjc0OTkwOCAxMDA2NDQKLS0tIGEvZHJp dmVycy9ncHUvZHJtL2k5MTUvaTkxNV9nZW0uYworKysgYi9kcml2ZXJzL2dwdS9kcm0vaTkxNS9p OTE1X2dlbS5jCkBAIC0xNjgxLDYgKzE2ODEsMTYgQEAgaTkxNV9nZW1fc3dfZmluaXNoX2lvY3Rs KHN0cnVjdCBkcm1fZGV2aWNlICpkZXYsIHZvaWQgKmRhdGEsCiAJcmV0dXJuIDA7CiB9CiAKK3N0 YXRpYyBpbmxpbmUgYm9vbAorX192bWFfbWF0Y2hlcyhzdHJ1Y3Qgdm1fYXJlYV9zdHJ1Y3QgKnZt YSwgc3RydWN0IGZpbGUgKmZpbHAsCisJICAgICAgdW5zaWduZWQgbG9uZyBhZGRyLCB1bnNpZ25l ZCBsb25nIHNpemUpCit7CisJaWYgKHZtYS0+dm1fZmlsZSAhPSBmaWxwKQorCQlyZXR1cm4gZmFs c2U7CisKKwlyZXR1cm4gdm1hLT52bV9zdGFydCA9PSBhZGRyICYmICh2bWEtPnZtX2VuZCAtIHZt YS0+dm1fc3RhcnQpID09IHNpemU7Cit9CisKIC8qKgogICogaTkxNV9nZW1fbW1hcF9pb2N0bCAt IE1hcHMgdGhlIGNvbnRlbnRzIG9mIGFuIG9iamVjdCwgcmV0dXJuaW5nIHRoZSBhZGRyZXNzCiAg KgkJCSBpdCBpcyBtYXBwZWQgdG8uCkBAIC0xNzM5LDcgKzE3NDksNyBAQCBpOTE1X2dlbV9tbWFw X2lvY3RsKHN0cnVjdCBkcm1fZGV2aWNlICpkZXYsIHZvaWQgKmRhdGEsCiAJCQlyZXR1cm4gLUVJ TlRSOwogCQl9CiAJCXZtYSA9IGZpbmRfdm1hKG1tLCBhZGRyKTsKLQkJaWYgKHZtYSkKKwkJaWYg KHZtYSAmJiBfX3ZtYV9tYXRjaGVzKHZtYSwgb2JqLT5iYXNlLmZpbHAsIGFkZHIsIGFyZ3MtPnNp emUpKQogCQkJdm1hLT52bV9wYWdlX3Byb3QgPQogCQkJCXBncHJvdF93cml0ZWNvbWJpbmUodm1f Z2V0X3BhZ2VfcHJvdCh2bWEtPnZtX2ZsYWdzKSk7CiAJCWVsc2UKLS0gCjIuMjAuMQoKX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KSW50ZWwtZ2Z4IG1haWxp bmcgbGlzdApJbnRlbC1nZnhAbGlzdHMuZnJlZWRlc2t0b3Aub3JnCmh0dHBzOi8vbGlzdHMuZnJl ZWRlc2t0b3Aub3JnL21haWxtYW4vbGlzdGluZm8vaW50ZWwtZ2Z4Cg==