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[2001:1c00:c1e:bf00:1054:9d19:e0f0:8214]) by smtp.gmail.com with ESMTPSA id c19sm2436939ejs.116.2021.09.03.03.03.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 03 Sep 2021 03:03:41 -0700 (PDT) Subject: Re: [PATCH v6] libata: Add ATA_HORKAGE_NO_NCQ_ON_ATI for Samsung 860 and 870 SSD. To: Kate Hsuan , Jens Axboe , Damien Le Moal Cc: linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org References: <20210903094411.58749-1-hpa@redhat.com> From: Hans de Goede Message-ID: <7a784055-bd0f-b07d-37d8-4a96f08615f6@redhat.com> Date: Fri, 3 Sep 2021 12:03:40 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20210903094411.58749-1-hpa@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On 9/3/21 11:44 AM, Kate Hsuan wrote: > Many users are reporting that the Samsung 860 and 870 SSD are having > various issues when combined with AMD/ATI (vendor ID 0x1002) SATA > controllers and only completely disabling NCQ helps to avoid these > issues. > > Always disabling NCQ for Samsung 860/870 SSDs regardless of the host > SATA adapter vendor will cause I/O performance degradation with well > behaved adapters. To limit the performance impact to ATI adapters, > introduce the ATA_HORKAGE_NO_NCQ_ON_ATI flag to force disable NCQ > only for these adapters. > > Also, two libata.force parameters (noncqati and ncqati) are introduced > to disable and enable the NCQ for the system which equipped with ATI > SATA adapter and Samsung 860 and 870 SSDs. The user can determine NCQ > function to be enabled or disabled according to the demand. > > After verifying the chipset from the user reports, the issue appears > on AMD/ATI SB7x0/SB8x0/SB9x0 SATA Controllers and does not appear on > recent AMD SATA adapters. The vendor ID of ATI should be 0x1002. > Therefore, ATA_HORKAGE_NO_NCQ_ON_AMD was modified to > ATA_HORKAGE_NO_NCQ_ON_ATI. > > BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=201693 > Signed-off-by: Kate Hsuan Thanks, patch looks good to me: Reviewed-by: Hans de Goede Regards, Hans > --- > Changes in v6: > * The adapter vendor ID check was revised to PCI_VENDOR_ID_ATI. > * ATA_HORKAGE_NO_NCQ_ON_AMD was revised to ATA_HORKAGE_NO_NCQ_ON_ATI. > * Two libata.force parameters was modified to noncqati and ncqati. > > Changes in v5: > * The libata.force parameters ncqamd and noncqamd are used to enable and > disable the NCQ for the systems equiped with AMD SATA adapter and > Samsung 860 and 870 SSDs. > * The character encoding of the patch comment was fixed. > > Changes in v4: > * A function ata_dev_check_adapter() is added to check the vendor ID of > the adapter. > * ATA_HORKAGE_NONCQ_ON_AMD was modified to ATA_HORKAGE_NO_NCQ_ON_AMD to > align with the naming convention. > * Commit messages were improved according to reviewer comments. > > Changes in v3: > * ATA_HORKAGE_NONCQ_ON_ASMEDIA_AMD_MARVELL was modified to > ATA_HORKAGE_NONCQ_ON_AMD. > * Codes were fixed to completely disable NCQ on AMD controller. > > --- > drivers/ata/libata-core.c | 34 ++++++++++++++++++++++++++++++++-- > include/linux/libata.h | 1 + > 2 files changed, 33 insertions(+), 2 deletions(-) > > diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c > index 3eda3291952b..85e4e56c0681 100644 > --- a/drivers/ata/libata-core.c > +++ b/drivers/ata/libata-core.c > @@ -2199,6 +2199,25 @@ static void ata_dev_config_ncq_prio(struct ata_device *dev) > > } > > +static bool ata_dev_check_adapter(struct ata_device *dev, > + unsigned short vendor_id) > +{ > + struct pci_dev *pcidev = NULL; > + struct device *parent_dev = NULL; > + > + for (parent_dev = dev->tdev.parent; parent_dev != NULL; > + parent_dev = parent_dev->parent) { > + if (dev_is_pci(parent_dev)) { > + pcidev = to_pci_dev(parent_dev); > + if (pcidev->vendor == vendor_id) > + return true; > + break; > + } > + } > + > + return false; > +} > + > static int ata_dev_config_ncq(struct ata_device *dev, > char *desc, size_t desc_sz) > { > @@ -2217,6 +2236,13 @@ static int ata_dev_config_ncq(struct ata_device *dev, > snprintf(desc, desc_sz, "NCQ (not used)"); > return 0; > } > + > + if (dev->horkage & ATA_HORKAGE_NO_NCQ_ON_ATI && > + ata_dev_check_adapter(dev, PCI_VENDOR_ID_ATI)) { > + snprintf(desc, desc_sz, "NCQ (not used)"); > + return 0; > + } > + > if (ap->flags & ATA_FLAG_NCQ) { > hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE); > dev->flags |= ATA_DFLAG_NCQ; > @@ -3951,9 +3977,11 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = { > { "Samsung SSD 850*", NULL, ATA_HORKAGE_NO_NCQ_TRIM | > ATA_HORKAGE_ZERO_AFTER_TRIM, }, > { "Samsung SSD 860*", NULL, ATA_HORKAGE_NO_NCQ_TRIM | > - ATA_HORKAGE_ZERO_AFTER_TRIM, }, > + ATA_HORKAGE_ZERO_AFTER_TRIM | > + ATA_HORKAGE_NO_NCQ_ON_ATI, }, > { "Samsung SSD 870*", NULL, ATA_HORKAGE_NO_NCQ_TRIM | > - ATA_HORKAGE_ZERO_AFTER_TRIM, }, > + ATA_HORKAGE_ZERO_AFTER_TRIM | > + ATA_HORKAGE_NO_NCQ_ON_ATI, }, > { "FCCT*M500*", NULL, ATA_HORKAGE_NO_NCQ_TRIM | > ATA_HORKAGE_ZERO_AFTER_TRIM, }, > > @@ -6108,6 +6136,8 @@ static int __init ata_parse_force_one(char **cur, > { "ncq", .horkage_off = ATA_HORKAGE_NONCQ }, > { "noncqtrim", .horkage_on = ATA_HORKAGE_NO_NCQ_TRIM }, > { "ncqtrim", .horkage_off = ATA_HORKAGE_NO_NCQ_TRIM }, > + { "noncqati", .horkage_on = ATA_HORKAGE_NO_NCQ_ON_ATI }, > + { "ncqati", .horkage_off = ATA_HORKAGE_NO_NCQ_ON_ATI }, > { "dump_id", .horkage_on = ATA_HORKAGE_DUMP_ID }, > { "pio0", .xfer_mask = 1 << (ATA_SHIFT_PIO + 0) }, > { "pio1", .xfer_mask = 1 << (ATA_SHIFT_PIO + 1) }, > diff --git a/include/linux/libata.h b/include/linux/libata.h > index 3fcd24236793..cb95d3f3337d 100644 > --- a/include/linux/libata.h > +++ b/include/linux/libata.h > @@ -422,6 +422,7 @@ enum { > ATA_HORKAGE_NOTRIM = (1 << 24), /* don't use TRIM */ > ATA_HORKAGE_MAX_SEC_1024 = (1 << 25), /* Limit max sects to 1024 */ > ATA_HORKAGE_MAX_TRIM_128M = (1 << 26), /* Limit max trim size to 128M */ > + ATA_HORKAGE_NO_NCQ_ON_ATI = (1 << 27), /* Disable NCQ on ATI chipset */ > > /* DMA mask for user DMA control: User visible values; DO NOT > renumber */ > -- > 2.31.1 >