From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Xu, Quan" Subject: Re: [PATCH v3 2/2] IOMMU/spinlock: Make the pcidevs_lock a recursive one Date: Thu, 10 Mar 2016 11:27:21 +0000 Message-ID: <945CA011AD5F084CBEA3E851C0AB28894B85FEB3@SHSMSX101.ccr.corp.intel.com> References: <1457529455-38314-1-git-send-email-quan.xu@intel.com> <1457529455-38314-3-git-send-email-quan.xu@intel.com> <56E1520002000078000DB243@prv-mh.provo.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <56E1520002000078000DB243@prv-mh.provo.novell.com> Content-Language: en-US List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Jan Beulich Cc: "Tian, Kevin" , "Wu, Feng" , Andrew Cooper , Dario Faggioli , "xen-devel@lists.xen.org" , Suravee Suthikulpanit , Keir Fraser List-Id: xen-devel@lists.xenproject.org T24gTWFyY2ggMTAsIDIwMTYgNTo1M3BtLCA8TWFyY2ggMTAsIDIwMTYgNTo1Mz4gd3JvdGU6Cj4g Pj4+IE9uIDA5LjAzLjE2IGF0IDE0OjE3LCA8cXVhbi54dUBpbnRlbC5jb20+IHdyb3RlOgo+ID4g U2lnbmVkLW9mZi1ieTogUXVhbiBYdSA8cXVhbi54dUBpbnRlbC5jb20+Cj4gPiBBY2tlZC1ieTog S2V2aW4gVGlhbiA8a2V2aW4udGlhbkBpbnRlbC5jb20+Cj4gCj4gVGhlIHBhdGNoIGl0c2VsZiBs b29rcyBtb3N0bHkgZmluZSBub3cgKHNlZSBiZWxvdyBmb3IgdGhlIG1pbm9yIGxlZnQgaXNzdWVz KSwgYnV0Cj4gdGhlIGNvbXBsZXRlIGxhY2sgb2YgYSBkZXNjcmlwdGlvbiAod2hpY2ggc2hvdWxk IHN0YXRlIHdoeSB0aGlzIGNoYW5nZSBpcyBiZWluZwo+IGRvbmUpIG1ha2VzIHRoaXMgbm90IHJl YWR5IHRvIGdvIGluIGFueXdheS4KPiAKCldoYXQgYWJvdXQgdGhlIGZvbGxvd2luZyBkZXNjcmlw dGlvbjoKLS0KVGhlIHBjaWRldnNfbG9jayBtYXkgYmUgcmVjdXJzaXZlbHkgdGFrZW4gZm9yIGhp ZGluZyBBVFMgZGV2aWNlLAp3aGVuIFZULWQgRGV2aWNlLVRMQiBmbHVzaCB0aW1lZCBvdXQuCgoK Cj4gPiAtLS0gYS94ZW4vZHJpdmVycy9wYXNzdGhyb3VnaC9wY2kuYwo+ID4gKysrIGIveGVuL2Ry aXZlcnMvcGFzc3Rocm91Z2gvcGNpLmMKPiA+IEBAIC00OCw3ICs0OCw3IEBAIHN0cnVjdCBwY2lf c2VnIHsKPiA+ICAgICAgfSBidXMyYnJpZGdlW01BWF9CVVNFU107Cj4gPiAgfTsKPiA+Cj4gPiAt c3BpbmxvY2tfdCBwY2lkZXZzX2xvY2sgPSBTUElOX0xPQ0tfVU5MT0NLRUQ7Cj4gPiArc3RhdGlj IHNwaW5sb2NrX3QgX3BjaWRldnNfbG9jayA9IFNQSU5fTE9DS19VTkxPQ0tFRDsKPiAKPiBXaHkg dGhlIHJlbmFtaW5nPwo+IAoKVGhlIG9yaWdpbmFsIG5hbWUgd291bGQgY2F1c2UgY29tcGlsZXIg ZXJyb3JzLCBhcyBJIGFsc28gaW50cm9kdWNlIGEgbmV3IGhlbHBlciB3aXRoIHNhbWUgbmFtZSAt LSB2b2lkIHBjaWRldnNfbG9jayh2b2lkKS4KCgo+ID4gQEAgLTEwMyw2ICsxMDMsMjYgQEAgc3Rh dGljIGludCBwY2lfc2VnbWVudHNfaXRlcmF0ZSgKPiA+ICAgICAgcmV0dXJuIHJjOwo+ID4gIH0K PiA+Cj4gPiArdm9pZCBwY2lkZXZzX2xvY2sodm9pZCkKPiA+ICt7Cj4gPiArICAgIHNwaW5fbG9j a19yZWN1cnNpdmUoJl9wY2lkZXZzX2xvY2spOwo+ID4gK30KPiA+ICsKPiA+ICt2b2lkIHBjaWRl dnNfdW5sb2NrKHZvaWQpCj4gPiArewo+ID4gKyAgICBzcGluX3VubG9ja19yZWN1cnNpdmUoJl9w Y2lkZXZzX2xvY2spOwo+ID4gK30KPiA+ICsKPiA+ICtpbnQgcGNpZGV2c19pc19sb2NrZWQodm9p ZCkKPiAKPiBib29sX3QKPiAKPiA+ICt7Cj4gPiArICAgIHJldHVybiBzcGluX2lzX2xvY2tlZCgm X3BjaWRldnNfbG9jayk7IH0KPiA+ICsKPiA+ICtpbnQgcGNpZGV2c190cnlsb2NrKHZvaWQpCj4g Cj4gYm9vbF90Cj4gCj4gKFRvIGF2b2lkIGFub3RoZXIgcm91bmQsIHBsZWFzZSBiZSBhd2FyZSB0 aGF0IHRoZSB1bmRlcmx5aW5nIHNwaW4gbG9jawo+IHByaW1pdGl2ZXMgc3RpbGwgW3dyb25nbHld IHVzZSAiaW50Iiwgc28gdG8gYmUgZnVsbHkgY29ycmVjdCB5b3Ugd2lsbCBuZWVkIHRvIHVzZSAh ISBpbgo+IGJvdGggcmV0dXJuIHN0YXRlbWVudHMsIHVubGVzcyB5b3UgZmVlbCBsaWtlIChpbiBh bm90aGVyIHByZXJlcSBwYXRjaCkgdG8gYWRqdXN0Cj4gdGhvc2UgcHJpbWl0aXZlcyB0b28uCj4g ClRoYW5rcyBmb3IgcmVtaW5kaW5nLgpJJ2QgcHJlZmVyIHRvIHVzZSAhISBpbiBib3RoIHJldHVy biBzdGF0ZW1lbnRzLgpidHcsIGNvdWxkIHlvdSBoZWxwIG1lIGNoZWNrIHRoZSBjb2RlIHN0eWxl PzoKCitib29sX3QgcGNpZGV2c19pc19sb2NrZWQodm9pZCkKK3sKKyAgICByZXR1cm4gISEoc3Bp bl9pc19sb2NrZWQoJl9wY2lkZXZzX2xvY2spKTsKK30KKworYm9vbF90IHBjaWRldnNfdHJ5bG9j ayh2b2lkKQoreworICAgIHJldHVybiAhIShzcGluX3RyeWxvY2tfcmVjdXJzaXZlKCZfcGNpZGV2 c19sb2NrKSk7Cit9CgpJcyBpdCByaWdodD8KCj4gPiArewo+ID4gKyAgICByZXR1cm4gc3Bpbl90 cnlsb2NrX3JlY3Vyc2l2ZSgmX3BjaWRldnNfbG9jayk7Cj4gPiArfQo+IAo+IEkgYWxzbyB0aGlu ayB0aGF0IGl0IHdvdWxkIGJlIGEgZ29vZCBpZGVhIHRvIHBsYWNlIHRoZXNlIGhlbHBlcnMgYW5k IHRoZSBsb2NrCj4gZGVmaW5pdGlvbiBuZXh0IHRvIGVhY2ggb3RoZXIuCj4gCkFncmVlZCwgbWFr ZSBzZW5zZS4KClF1YW4KCgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX18KWGVuLWRldmVsIG1haWxpbmcgbGlzdApYZW4tZGV2ZWxAbGlzdHMueGVuLm9yZwpo dHRwOi8vbGlzdHMueGVuLm9yZy94ZW4tZGV2ZWwK