RE: [PATCH 5/5] megaraid_sas: add mmio barrier after register writes

2016-11-29 Thread Kashyap Desai
Of Tomas Henzl > >> Sent: Friday, November 18, 2016 9:23 PM > >> To: Hannes Reinecke; Martin K. Petersen > >> Cc: Christoph Hellwig; James Bottomley; Sumit Saxena; linux- > >> s...@vger.kernel.org; Hannes Reinecke > >> Subject: Re: [PATCH 5/5] megarai

Re: [PATCH 5/5] megaraid_sas: add mmio barrier after register writes

2016-11-21 Thread Tomas Henzl
ersen >> Cc: Christoph Hellwig; James Bottomley; Sumit Saxena; linux- >> s...@vger.kernel.org; Hannes Reinecke >> Subject: Re: [PATCH 5/5] megaraid_sas: add mmio barrier after register > writes >> On 11.11.2016 10:44, Hannes Reinecke wrote: >>> The megaraid_sas HB

RE: [PATCH 5/5] megaraid_sas: add mmio barrier after register writes

2016-11-18 Thread Kashyap Desai
Saxena; linux- > s...@vger.kernel.org; Hannes Reinecke > Subject: Re: [PATCH 5/5] megaraid_sas: add mmio barrier after register writes > > On 11.11.2016 10:44, Hannes Reinecke wrote: > > The megaraid_sas HBA only has a single register for I/O submission, > > which will be hit pretty

Re: [PATCH 5/5] megaraid_sas: add mmio barrier after register writes

2016-11-18 Thread Tomas Henzl
On 11.11.2016 10:44, Hannes Reinecke wrote: > The megaraid_sas HBA only has a single register for I/O submission, > which will be hit pretty hard with scsi-mq. To ensure that the > PCI writes have made it across we need to add a mmio barrier > after each write; otherwise I've been seeing spurious c

RE: [PATCH 5/5] megaraid_sas: add mmio barrier after register writes

2016-11-11 Thread Sumit Saxena
>-Original Message- >From: Hannes Reinecke [mailto:h...@suse.de] >Sent: Friday, November 11, 2016 3:15 PM >To: Martin K. Petersen >Cc: Christoph Hellwig; James Bottomley; Sumit Saxena; linux- >s...@vger.kernel.org; Hannes Reinecke; Hannes Reinecke >Subject: [PATCH 5/5] megaraid_sas: add mmi