From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: [PATCH 1/3] arm64: enable pci resource mapping using sysfs Date: Mon, 20 Mar 2017 10:28:12 +0000 Message-ID: <1490005692.5036.8.camel@infradead.org> References: <1489598266.86622.12.camel@infradead.org> <20170315175353.GA29452@leverpostej> <1489605496.4195.182.camel@infradead.org> <20170320102403.GC17263@arm.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-pKu7sIcQGOxrZM3I4tcf" Return-path: In-Reply-To: <20170320102403.GC17263@arm.com> Sender: linux-kernel-owner@vger.kernel.org To: Will Deacon Cc: Mark Rutland , linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Catalin Marinas List-Id: linux-arch.vger.kernel.org --=-pKu7sIcQGOxrZM3I4tcf Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2017-03-20 at 10:24 +0000, Will Deacon wrote: >=20 > Just to be clear here: I'm not against exposing the proc interface if > something actually needs it, but all the requests we've had for this have > been concerned only with the sysfs API. So I'd rather start with just tha= t, > instead of exposing both and have new software written to the proc interf= ace, > which we certainly want to discourage. The point is that they are tied together. An architecture provides its pci_mmap_page_range() function and sets HAVE_PCI_MMAP, and then the *generic* code in drivers/pci will use it from both places. Although as noted, there is a third userspace API in drivers/vfio which does this *without* any arch-specific code (using pgprot_noncached(), and failing to set up the VMA correctly on HAVE_IOREMAP_PROT platforms. I was looking at cleaning that whole mess up, but got distracted by kdump-on-CPU-1 failures. If I'm going to blame that on firmware, I'll get back to PCI mmap this week... :) --=-pKu7sIcQGOxrZM3I4tcf Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCDzUw ggSvMIIDl6ADAgECAhEA4CPLFRKDU4mtYW56VGdrITANBgkqhkiG9w0BAQsFADBvMQswCQYDVQQG EwJTRTEUMBIGA1UEChMLQWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFkZFRydXN0IEV4dGVybmFsIFRU UCBOZXR3b3JrMSIwIAYDVQQDExlBZGRUcnVzdCBFeHRlcm5hbCBDQSBSb290MB4XDTE0MTIyMjAw MDAwMFoXDTIwMDUzMDEwNDgzOFowgZsxCzAJBgNVBAYTAkdCMRswGQYDVQQIExJHcmVhdGVyIE1h bmNoZXN0ZXIxEDAOBgNVBAcTB1NhbGZvcmQxGjAYBgNVBAoTEUNPTU9ETyBDQSBMaW1pdGVkMUEw PwYDVQQDEzhDT01PRE8gU0hBLTI1NiBDbGllbnQgQXV0aGVudGljYXRpb24gYW5kIFNlY3VyZSBF bWFpbCBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAImxDdp6UxlOcFIdvFamBia3 uEngludRq/HwWhNJFaO0jBtgvHpRQqd5jKQi3xdhTpHVdiMKFNNKAn+2HQmAbqUEPdm6uxb+oYep 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From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from twosheds.infradead.org ([90.155.92.209]:58892 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754099AbdCTK2U (ORCPT ); Mon, 20 Mar 2017 06:28:20 -0400 Message-ID: <1490005692.5036.8.camel@infradead.org> Subject: Re: [PATCH 1/3] arm64: enable pci resource mapping using sysfs From: David Woodhouse In-Reply-To: <20170320102403.GC17263@arm.com> References: <1489598266.86622.12.camel@infradead.org> <20170315175353.GA29452@leverpostej> <1489605496.4195.182.camel@infradead.org> <20170320102403.GC17263@arm.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-pKu7sIcQGOxrZM3I4tcf" Date: Mon, 20 Mar 2017 10:28:12 +0000 Mime-Version: 1.0 Sender: linux-arch-owner@vger.kernel.org List-ID: To: Will Deacon Cc: Mark Rutland , linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Catalin Marinas Message-ID: <20170320102812.NWwxFU4J_50Ie4KTThlQLxpJE1RRDJ3gE1QUarLXrBs@z> --=-pKu7sIcQGOxrZM3I4tcf Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2017-03-20 at 10:24 +0000, Will Deacon wrote: >=20 > Just to be clear here: I'm not against exposing the proc interface if > something actually needs it, but all the requests we've had for this have > been concerned only with the sysfs API. So I'd rather start with just tha= t, > instead of exposing both and have new software written to the proc interf= ace, > which we certainly want to discourage. The point is that they are tied together. An architecture provides its pci_mmap_page_range() function and sets HAVE_PCI_MMAP, and then the *generic* code in drivers/pci will use it from both places. Although as noted, there is a third userspace API in drivers/vfio which does this *without* any arch-specific code (using pgprot_noncached(), and failing to set up the VMA correctly on HAVE_IOREMAP_PROT platforms. I was looking at cleaning that whole mess up, but got distracted by kdump-on-CPU-1 failures. If I'm going to blame that on firmware, I'll get back to PCI mmap this week... :) --=-pKu7sIcQGOxrZM3I4tcf Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCDzUw ggSvMIIDl6ADAgECAhEA4CPLFRKDU4mtYW56VGdrITANBgkqhkiG9w0BAQsFADBvMQswCQYDVQQG EwJTRTEUMBIGA1UEChMLQWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFkZFRydXN0IEV4dGVybmFsIFRU UCBOZXR3b3JrMSIwIAYDVQQDExlBZGRUcnVzdCBFeHRlcm5hbCBDQSBSb290MB4XDTE0MTIyMjAw MDAwMFoXDTIwMDUzMDEwNDgzOFowgZsxCzAJBgNVBAYTAkdCMRswGQYDVQQIExJHcmVhdGVyIE1h bmNoZXN0ZXIxEDAOBgNVBAcTB1NhbGZvcmQxGjAYBgNVBAoTEUNPTU9ETyBDQSBMaW1pdGVkMUEw PwYDVQQDEzhDT01PRE8gU0hBLTI1NiBDbGllbnQgQXV0aGVudGljYXRpb24gYW5kIFNlY3VyZSBF bWFpbCBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAImxDdp6UxlOcFIdvFamBia3 uEngludRq/HwWhNJFaO0jBtgvHpRQqd5jKQi3xdhTpHVdiMKFNNKAn+2HQmAbqUEPdm6uxb+oYep 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