From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eugeniy Paltsev Subject: Re: ensure dma_alloc_coherent always returns zeroed memory Date: Thu, 20 Dec 2018 14:32:52 +0000 Message-ID: <1545316369.14089.20.camel@synopsys.com> References: <20181214082515.14835-1-hch@lst.de> <20181219165939.GA26087@lst.de> Mime-Version: 1.0 Content-Transfer-Encoding: base64 Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=synopsys.com; s=mail; t=1545316378; bh=GOeeGQYGm4G/inhh155glchXwRUk2B2MXoesoIy4i8A=; h=From:To:CC:Subject:Date:References:In-Reply-To:From; b=SXTCiUztfb3IDqMdskTrelyyR4NkaQp7GpHRB7D1C7jhIepoOfr/E3+7/IgLEAPn7 aQNxwbYvyv62kYZeBle75lwOYy45ubl5trfBPNFYaA2V2FsNL5F0jQ65cqzF/Rmqb2 AkmyreJpLxt44nOvWCUvTJgWT3Oh1PP2f79xTcqDVC8IAZDVnSkIid8+Y0oYp+nniP QZ9jsL6nD/dMVWC6ciHYfAI5yohSaBCpsNS/x4jLfpeN0iPjWWvPqaXsTkS0JRuVdY 9shkXjxEGqVwCmHDIvCFbfTHYJd0tb7KE+19b0EptBkNTb565QSXWBpjcSNhPI3/99 hid/6p4cWYZdw== In-Reply-To: <20181219165939.GA26087@lst.de> Content-Language: en-US Content-ID: Sender: linux-kernel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" To: "hch@lst.de" , Vineet Gupta , "iommu@lists.linux-foundation.org" Cc: "linux-kernel@vger.kernel.org" , "linux-s390@vger.kernel.org" , "linux-xtensa@linux-xtensa.org" , "linux-m68k@lists.linux-m68k.org" , "linux-alpha@vger.kernel.org" , "linux-snps-arc@lists.infradead.org" , "openrisc@lists.librecores.org" , "ashutosh.dixit@intel.com" , "linux-parisc@vger.kernel.org" , "linux-c6x-dev@linux-c6x.org" , "monstr@monstr.eu" , "sparclinux@vger.kernel.org" SGkgQ2hyaXN0b3BoLA0KDQpJIHRlc3Qga2VybmVsIGZyb20geW91ciAnZG1hLWFsbG9jLWFsd2F5 cy16ZXJvJyBicmFuY2gsIGFuZCBhcw0KSSBjYW4gc2VlIHdlIGhhdmUgRE1BIHBlcmlwaGVyYWxz IChsaWtlIFVTQikgYnJva2VuLg0KDQpUaGVyZSBhcmUgdGhlIGVycm9ycyBleGFtcGxlIEkgZ290 IGR1cmluZyBVU0IgaW5pdGlhbGl6aW5nOg0KLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t PjgtLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLQ0KdXNiIDEtMTogZGV2aWNlIGRlc2Ny aXB0b3IgcmVhZC82NCwgZXJyb3IgLTExMA0KdXNiIHVzYjEtcG9ydDE6IGF0dGVtcHQgcG93ZXIg Y3ljbGUNCnVzYiAxLTE6IG5ldyBoaWdoLXNwZWVkIFVTQiBkZXZpY2UgbnVtYmVyIDQgdXNpbmcg ZWhjaS1wbGF0Zm9ybQ0KdXNiIDEtMTogZGV2aWNlIGRlc2NyaXB0b3IgcmVhZC82NCwgZXJyb3Ig LTExMA0KdXNiIDEtMTogZGV2aWNlIGRlc2NyaXB0b3IgcmVhZC82NCwgZXJyb3IgLTExMA0KdXNi IDEtMTogbmV3IGhpZ2gtc3BlZWQgVVNCIGRldmljZSBudW1iZXIgNSB1c2luZyBlaGNpLXBsYXRm b3JtDQp1c2IgMS0xOiBkZXZpY2UgZGVzY3JpcHRvciByZWFkLzY0LCBlcnJvciAtMTEwDQp1c2Ig MS0xOiBkZXZpY2UgZGVzY3JpcHRvciByZWFkLzY0LCBlcnJvciAtMTEwDQp1c2IgdXNiMS1wb3J0 MTogdW5hYmxlIHRvIGVudW1lcmF0ZSBVU0IgZGV2aWNlDQp1c2IgMi0xOiBuZXcgZnVsbC1zcGVl ZCBVU0IgZGV2aWNlIG51bWJlciAyIHVzaW5nIG9oY2ktcGxhdGZvcm0NCnVzYiAyLTE6IGRldmlj ZSBkZXNjcmlwdG9yIHJlYWQvYWxsLCBlcnJvciAtODQNCnVzYiAyLTE6IG5ldyBmdWxsLXNwZWVk IFVTQiBkZXZpY2UgbnVtYmVyIDMgdXNpbmcgb2hjaS1wbGF0Zm9ybQ0KdXNiIDItMTogZGV2aWNl IGRlc2NyaXB0b3IgcmVhZC9hbGwsIGVycm9yIC04NA0KdXNiIHVzYjItcG9ydDE6IGF0dGVtcHQg cG93ZXIgY3ljbGUNCnVzYiAyLTE6IG5ldyBmdWxsLXNwZWVkIFVTQiBkZXZpY2UgbnVtYmVyIDQg dXNpbmcgb2hjaS1wbGF0Zm9ybQ0KdXNiIDItMTogZGV2aWNlIGRlc2NyaXB0b3IgcmVhZC84LCBl cnJvciAtNjINCnVzYiAyLTE6IGRldmljZSBkZXNjcmlwdG9yIHJlYWQvOCwgZXJyb3IgLTYyDQp1 c2IgMi0xOiBuZXcgZnVsbC1zcGVlZCBVU0IgZGV2aWNlIG51bWJlciA1IHVzaW5nIG9oY2ktcGxh dGZvcm0NCnVzYiAyLTE6IGRldmljZSBkZXNjcmlwdG9yIHJlYWQvOCwgZXJyb3IgLTg0DQp1c2Ig Mi0xOiBkZXZpY2UgZGVzY3JpcHRvciByZWFkLzgsIGVycm9yIC04NA0KdXNiIHVzYjItcG9ydDE6 IHVuYWJsZSB0byBlbnVtZXJhdGUgVVNCIGRldmljZQ0KIFtzbmlwXQ0KLS0tLS0tLS0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tODwtLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLQ0KDQoNCk9u IFdlZCwgMjAxOC0xMi0xOSBhdCAxNzo1OSArMDEwMCwgQ2hyaXN0b3BoIEhlbGx3aWcgd3JvdGU6 DQo+IEZZSSwgSSd2ZSBwaWNrZWQgdGhpcyB1cCBmb3IgZG1hLW1hcHBpbmcgZm9yLW5leHQgbm93 Lg0KPiANCj4gX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18N Cj4gbGludXgtc25wcy1hcmMgbWFpbGluZyBsaXN0DQo+IGxpbnV4LXNucHMtYXJjQGxpc3RzLmlu ZnJhZGVhZC5vcmcNCj4gaHR0cHM6Ly91cmxkZWZlbnNlLnByb29mcG9pbnQuY29tL3YyL3VybD91 PWh0dHAtM0FfX2xpc3RzLmluZnJhZGVhZC5vcmdfbWFpbG1hbl9saXN0aW5mb19saW51eC0yRHNu cHMtMkRhcmMmZD1Ed0lDQWcmYz1EUEw2X1hfNkprWEZ4N0FYV3FCMHRnJnI9WmxKTg0KPiAxTXJp UFVUa0JLQ3JQU3g2N0dtYXBsRVVHY0FFazl5UHRDTGRVWEkmbT1uYUJDVDk2QTRSU1FKTHpCV3p1 Q2NtcHRGR2lRRGZGVE9XSnBwcnFESVZrJnM9Y0hGODR2YTg5b2ZQNlZsclY2ODNld0VOVVhkYUxX N29wYW1MWlNrWkJnayZlPQ0KLS0gDQogRXVnZW5peSBQYWx0c2V2 From mboxrd@z Thu Jan 1 00:00:00 1970 From: eugeniy.paltsev@synopsys.com (Eugeniy Paltsev) Date: Thu, 20 Dec 2018 14:32:52 +0000 Subject: ensure dma_alloc_coherent always returns zeroed memory In-Reply-To: <20181219165939.GA26087@lst.de> References: <20181214082515.14835-1-hch@lst.de> <20181219165939.GA26087@lst.de> List-ID: Message-ID: <1545316369.14089.20.camel@synopsys.com> To: linux-snps-arc@lists.infradead.org Hi Christoph, I test kernel from your 'dma-alloc-always-zero' branch, and as I can see we have DMA peripherals (like USB) broken. There are the errors example I got during USB initializing: ------------------------------>8-------------------------------- usb 1-1: device descriptor read/64, error -110 usb usb1-port1: attempt power cycle usb 1-1: new high-speed USB device number 4 using ehci-platform usb 1-1: device descriptor read/64, error -110 usb 1-1: device descriptor read/64, error -110 usb 1-1: new high-speed USB device number 5 using ehci-platform usb 1-1: device descriptor read/64, error -110 usb 1-1: device descriptor read/64, error -110 usb usb1-port1: unable to enumerate USB device usb 2-1: new full-speed USB device number 2 using ohci-platform usb 2-1: device descriptor read/all, error -84 usb 2-1: new full-speed USB device number 3 using ohci-platform usb 2-1: device descriptor read/all, error -84 usb usb2-port1: attempt power cycle usb 2-1: new full-speed USB device number 4 using ohci-platform usb 2-1: device descriptor read/8, error -62 usb 2-1: device descriptor read/8, error -62 usb 2-1: new full-speed USB device number 5 using ohci-platform usb 2-1: device descriptor read/8, error -84 usb 2-1: device descriptor read/8, error -84 usb usb2-port1: unable to enumerate USB device [snip] ------------------------------8<-------------------------------- On Wed, 2018-12-19@17:59 +0100, Christoph Hellwig wrote: > FYI, I've picked this up for dma-mapping for-next now. > > _______________________________________________ > linux-snps-arc mailing list > linux-snps-arc at lists.infradead.org > https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.infradead.org_mailman_listinfo_linux-2Dsnps-2Darc&d=DwICAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=ZlJN > 1MriPUTkBKCrPSx67GmaplEUGcAEk9yPtCLdUXI&m=naBCT96A4RSQJLzBWzuCcmptFGiQDfFTOWJpprqDIVk&s=cHF84va89ofP6VlrV683ewENUXdaLW7opamLZSkZBgk&e= -- Eugeniy Paltsev From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eugeniy Paltsev Date: Thu, 20 Dec 2018 14:32:52 +0000 Subject: Re: ensure dma_alloc_coherent always returns zeroed memory Message-Id: <1545316369.14089.20.camel@synopsys.com> List-Id: References: <20181214082515.14835-1-hch@lst.de> <20181219165939.GA26087@lst.de> In-Reply-To: <20181219165939.GA26087@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: "hch@lst.de" , Vineet Gupta , "iommu@lists.linux-foundation.org" Cc: "linux-kernel@vger.kernel.org" , "linux-s390@vger.kernel.org" , "linux-xtensa@linux-xtensa.org" , "linux-m68k@lists.linux-m68k.org" , "linux-alpha@vger.kernel.org" , "linux-snps-arc@lists.infradead.org" , "openrisc@lists.librecores.org" , "ashutosh.dixit@intel.com" , "linux-parisc@vger.kernel.org" , "linux-c6x-dev@linux-c6x.org" , "monstr@monstr.eu" , "sparclinux@vger.kernel.org" SGkgQ2hyaXN0b3BoLA0KDQpJIHRlc3Qga2VybmVsIGZyb20geW91ciAnZG1hLWFsbG9jLWFsd2F5 cy16ZXJvJyBicmFuY2gsIGFuZCBhcw0KSSBjYW4gc2VlIHdlIGhhdmUgRE1BIHBlcmlwaGVyYWxz IChsaWtlIFVTQikgYnJva2VuLg0KDQpUaGVyZSBhcmUgdGhlIGVycm9ycyBleGFtcGxlIEkgZ290 IGR1cmluZyBVU0IgaW5pdGlhbGl6aW5nOg0KLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t PjgtLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLQ0KdXNiIDEtMTogZGV2aWNlIGRlc2Ny aXB0b3IgcmVhZC82NCwgZXJyb3IgLTExMA0KdXNiIHVzYjEtcG9ydDE6IGF0dGVtcHQgcG93ZXIg Y3ljbGUNCnVzYiAxLTE6IG5ldyBoaWdoLXNwZWVkIFVTQiBkZXZpY2UgbnVtYmVyIDQgdXNpbmcg ZWhjaS1wbGF0Zm9ybQ0KdXNiIDEtMTogZGV2aWNlIGRlc2NyaXB0b3IgcmVhZC82NCwgZXJyb3Ig LTExMA0KdXNiIDEtMTogZGV2aWNlIGRlc2NyaXB0b3IgcmVhZC82NCwgZXJyb3IgLTExMA0KdXNi IDEtMTogbmV3IGhpZ2gtc3BlZWQgVVNCIGRldmljZSBudW1iZXIgNSB1c2luZyBlaGNpLXBsYXRm b3JtDQp1c2IgMS0xOiBkZXZpY2UgZGVzY3JpcHRvciByZWFkLzY0LCBlcnJvciAtMTEwDQp1c2Ig MS0xOiBkZXZpY2UgZGVzY3JpcHRvciByZWFkLzY0LCBlcnJvciAtMTEwDQp1c2IgdXNiMS1wb3J0 MTogdW5hYmxlIHRvIGVudW1lcmF0ZSBVU0IgZGV2aWNlDQp1c2IgMi0xOiBuZXcgZnVsbC1zcGVl ZCBVU0IgZGV2aWNlIG51bWJlciAyIHVzaW5nIG9oY2ktcGxhdGZvcm0NCnVzYiAyLTE6IGRldmlj ZSBkZXNjcmlwdG9yIHJlYWQvYWxsLCBlcnJvciAtODQNCnVzYiAyLTE6IG5ldyBmdWxsLXNwZWVk IFVTQiBkZXZpY2UgbnVtYmVyIDMgdXNpbmcgb2hjaS1wbGF0Zm9ybQ0KdXNiIDItMTogZGV2aWNl IGRlc2NyaXB0b3IgcmVhZC9hbGwsIGVycm9yIC04NA0KdXNiIHVzYjItcG9ydDE6IGF0dGVtcHQg cG93ZXIgY3ljbGUNCnVzYiAyLTE6IG5ldyBmdWxsLXNwZWVkIFVTQiBkZXZpY2UgbnVtYmVyIDQg dXNpbmcgb2hjaS1wbGF0Zm9ybQ0KdXNiIDItMTogZGV2aWNlIGRlc2NyaXB0b3IgcmVhZC84LCBl cnJvciAtNjINCnVzYiAyLTE6IGRldmljZSBkZXNjcmlwdG9yIHJlYWQvOCwgZXJyb3IgLTYyDQp1 c2IgMi0xOiBuZXcgZnVsbC1zcGVlZCBVU0IgZGV2aWNlIG51bWJlciA1IHVzaW5nIG9oY2ktcGxh dGZvcm0NCnVzYiAyLTE6IGRldmljZSBkZXNjcmlwdG9yIHJlYWQvOCwgZXJyb3IgLTg0DQp1c2Ig Mi0xOiBkZXZpY2UgZGVzY3JpcHRvciByZWFkLzgsIGVycm9yIC04NA0KdXNiIHVzYjItcG9ydDE6 IHVuYWJsZSB0byBlbnVtZXJhdGUgVVNCIGRldmljZQ0KIFtzbmlwXQ0KLS0tLS0tLS0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tODwtLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLQ0KDQoNCk9u IFdlZCwgMjAxOC0xMi0xOSBhdCAxNzo1OSArMDEwMCwgQ2hyaXN0b3BoIEhlbGx3aWcgd3JvdGU6 DQo+IEZZSSwgSSd2ZSBwaWNrZWQgdGhpcyB1cCBmb3IgZG1hLW1hcHBpbmcgZm9yLW5leHQgbm93 Lg0KPiANCj4gX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18N Cj4gbGludXgtc25wcy1hcmMgbWFpbGluZyBsaXN0DQo+IGxpbnV4LXNucHMtYXJjQGxpc3RzLmlu ZnJhZGVhZC5vcmcNCj4gaHR0cHM6Ly91cmxkZWZlbnNlLnByb29mcG9pbnQuY29tL3YyL3VybD91 PWh0dHAtM0FfX2xpc3RzLmluZnJhZGVhZC5vcmdfbWFpbG1hbl9saXN0aW5mb19saW51eC0yRHNu cHMtMkRhcmMmZD1Ed0lDQWcmYz1EUEw2X1hfNkprWEZ4N0FYV3FCMHRnJnI9WmxKTg0KPiAxTXJp UFVUa0JLQ3JQU3g2N0dtYXBsRVVHY0FFazl5UHRDTGRVWEkmbT1uYUJDVDk2QTRSU1FKTHpCV3p1 Q2NtcHRGR2lRRGZGVE9XSnBwcnFESVZrJnM9Y0hGODR2YTg5b2ZQNlZsclY2ODNld0VOVVhkYUxX N29wYW1MWlNrWkJnayZlPQ0KLS0gDQogRXVnZW5peSBQYWx0c2V2