On Sun, Jun 21, 2020 at 12:58 AM Bjorn Andersson <bjorn.andersson@xxxxxxxxxx> wrote: > > On Sun 21 Jun 00:40 PDT 2020, Avri Altman wrote: > > > > > > > > > On Wed, Apr 8, 2020 at 3:00 PM Asutosh Das <asutoshd@xxxxxxxxxxxxxx> > > > wrote: > > > > > > > > The write performance of TLC NAND is considerably > > > > lower than SLC NAND. Using SLC NAND as a WriteBooster > > > > Buffer enables the write request to be processed with > > > > lower latency and improves the overall write performance. > > > > > > > > Adds support for shared-buffer mode WriteBooster. > > > > > > > > WriteBooster enable: SW enables it when clocks are > > > > scaled up, thus it's enabled only in high load conditions. > > > > > > > > WriteBooster disable: SW will disable the feature, > > > > when clocks are scaled down. Thus writes would go as normal > > > > writes. > > > > > > btw, in v5.8-rc1 (plus handful of remaining patches for lenovo c630 > > > laptop (sdm850)), I'm seeing a lot of: > > > > > > ufshcd-qcom 1d84000.ufshc: ufshcd_query_flag: Sending flag query for > > > idn 14 failed, err = 253 > > > ufshcd-qcom 1d84000.ufshc: ufshcd_query_flag: Sending flag query for > > > idn 14 failed, err = 253 > > > ufshcd-qcom 1d84000.ufshc: ufshcd_query_flag_retry: query attribute, > > > opcode 6, idn 14, failed with error 253 after 3 retires > > > ufshcd-qcom 1d84000.ufshc: ufshcd_wb_ctrl write booster enable failed 253 > > > > > > and at least subjectively, compiling mesa seems slower, which seems > > > like it might be related? > > This looks like a device issue to be taken with the flash vendor: > > There's no way for a end-user to file a bug report with the flash vendor > on a device bought from an OEM and even if they would accept the bug > report they wouldn't re-provision the flash in an shipped device. > > So you will have to work around this in the driver. oh, ugg.. well I think these msgs from dmesg identify the part if we end up needing to use a denylist: scsi 0:0:0:49488: Well-known LUN SKhynix H28S8Q302CMR A102 PQ: 0 ANSI: 6 scsi 0:0:0:49476: Well-known LUN SKhynix H28S8Q302CMR A102 PQ: 0 ANSI: 6 scsi 0:0:0:49456: Well-known LUN SKhynix H28S8Q302CMR A102 PQ: 0 ANSI: 6 scsi 0:0:0:0: Direct-Access SKhynix H28S8Q302CMR A102 PQ: 0 ANSI: 6 scsi 0:0:0:1: Direct-Access SKhynix H28S8Q302CMR A102 PQ: 0 ANSI: 6 sd 0:0:0:0: [sda] 29765632 4096-byte logical blocks: (122 GB/114 GiB) sd 0:0:0:0: [sda] Write Protect is off sd 0:0:0:0: [sda] Mode Sense: 00 32 00 10 sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, supports DPO and FUA sd 0:0:0:0: [sda] Optimal transfer size 786432 bytes scsi 0:0:0:2: Direct-Access SKhynix H28S8Q302CMR A102 PQ: 0 ANSI: 6 scsi 0:0:0:3: Direct-Access SKhynix H28S8Q302CMR A102 PQ: 0 ANSI: 6 (otoh I guess the driver could just notice that writeboost keeps failing and stop trying to use it) BR, -R > Regards, > Bjorn > > > The device reports that it supports wd, but returns inalid idn for flag 0xe... > > > > Thanks, > > Avri
