From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ezequiel Garcia Subject: Re: Bug report: MIPS CI20/jz4740-mmc DMA and PREEMPT_NONE Date: Wed, 17 Oct 2018 14:55:18 -0300 Message-ID: <75b42b9f86b504bbd84dfab1e2c6fd0965216c67.camel@collabora.com> References: <20181014170431.GK3461@darkstar.musicnaut.iki.fi> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20181014170431.GK3461@darkstar.musicnaut.iki.fi> Sender: linux-kernel-owner@vger.kernel.org To: Aaro Koskinen , linux-mips@linux-mips.org, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Ulf Hansson , Mathieu Malaterre , Ezequiel Garcia List-Id: linux-mmc@vger.kernel.org On Sun, 2018-10-14 at 20:04 +0300, Aaro Koskinen wrote: > Hi, > > There is something wrong with jz4740-mmc in current mainline kernel > (tested v4.18 and 4.19-rc, the MMC support for CI20 does not exist > prior those), as the DMA support does not work properly if I disable > kernel pre-emption. The console gets flooded with: > > [ 16.461094] jz4740-mmc 13450000.mmc: [jz4740_mmc_prepare_dma_data] invalid cookie: data->host_cookie 567 host->next_data.cookie 568 > [ 16.473120] jz4740-mmc 13450000.mmc: [jz4740_mmc_prepare_dma_data] invalid cookie: data->host_cookie 568 host->next_data.cookie 569 > [ 16.485144] jz4740-mmc 13450000.mmc: [jz4740_mmc_prepare_dma_data] invalid cookie: data->host_cookie 569 host->next_data.cookie 570 > [ 16.497170] jz4740-mmc 13450000.mmc: [jz4740_mmc_prepare_dma_data] invalid cookie: data->host_cookie 570 host->next_data.cookie 571 > [ 16.509194] jz4740-mmc 13450000.mmc: [jz4740_mmc_prepare_dma_data] invalid cookie: data->host_cookie 571 host->next_data.cookie 572 > [ 16.532421] jz4740-mmc 13450000.mmc: [jz4740_mmc_prepare_dma_data] invalid cookie: data->host_cookie 572 host->next_data.cookie 573 > [ 16.544594] jz4740-mmc 13450000.mmc: [jz4740_mmc_prepare_dma_data] invalid cookie: data->host_cookie 573 host->next_data.cookie 574 > [ 16.556621] jz4740-mmc 13450000.mmc: [jz4740_mmc_prepare_dma_data] invalid cookie: data->host_cookie 574 host->next_data.cookie 575 > [ 16.568638] jz4740-mmc 13450000.mmc: [jz4740_mmc_prepare_dma_data] invalid cookie: data->host_cookie 575 host->next_data.cookie 576 > [ 16.601092] jz4740-mmc 13450000.mmc: [jz4740_mmc_prepare_dma_data] invalid cookie: data->host_cookie 582 host->next_data.cookie 583 > > etc. ad inf. > > This should be easily reproducible on CI20 board with ci20_defconfig > and setting CONFIG_PREEMPT_NONE=y. > Will take a look as soon as possible, most likely after ELCE. Thanks, Eze