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Message-ID: <cc7b4426-f6a6-e6b1-4aaf-0a713ee3d388@opensource.wdc.com>
Date: Wed, 23 Mar 2022 14:01:34 +0900
From: Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To: "Limonciello, Mario" <Mario.Limonciello@....com>,
Paul Menzel <pmenzel@...gen.mpg.de>
Cc: Hans de Goede <hdegoede@...hat.com>,
"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Shah, Nehal-bakulchandra" <Nehal-bakulchandra.Shah@....com>
Subject: Re: [PATCH v2 3/3] ata: ahci: Skip 200 ms debounce delay for AMD 300
Series Chipset SATA Controller
On 3/22/22 06:51, Limonciello, Mario wrote:
> [Public]
>
>> -----Original Message-----
>> From: Paul Menzel <pmenzel@...gen.mpg.de>
>> Sent: Monday, March 21, 2022 16:25
>> To: Damien Le Moal <damien.lemoal@...nsource.wdc.com>
>> Cc: Paul Menzel <pmenzel@...gen.mpg.de>; Hans de Goede
>> <hdegoede@...hat.com>; Limonciello, Mario
>> <Mario.Limonciello@....com>; linux-ide@...r.kernel.org; linux-
>> kernel@...r.kernel.org
>> Subject: [PATCH v2 3/3] ata: ahci: Skip 200 ms debounce delay for AMD 300
>> Series Chipset SATA Controller
>>
>> AMD chipsets for AMD Ryzen contain two SATA controllers, for example on
>> the
>> Dell OptiPlex 5055 Ryzen CPU/0P03DX:
>>
>> 01:00.1 SATA controller [0106]: Advanced Micro Devices, Inc. [AMD] 300
>> Series Chipset SATA Controller [1022:43b7] (rev 02)
>> 07:00.2 SATA controller [0106]: Advanced Micro Devices, Inc. [AMD] FCH
>> SATA Controller [AHCI mode] [1022:7901] (rev 51)
>>
>> The 300 Series Chipset SATA Controller [1022:43b7] does not need the 200 ms
>> delay before debouncing the PHY in `sata_link_resume()`, so skip it by
>> mapping it to the board with no debounce delay.
>>
>> Tested on the Dell OptiPlex 5055 Ryzen CPU/0P03DX, BIOS 1.1.50 07/28/2021
>> Linux 5.17 with an HDD connected to ata1 connected to 01:00.1, and no other
>> storage devices. (Only ata9 is connected to 07:00.2.)
>>
>> Currently, without this patch (with 200 ms delay), device probe for ata1
>> takes 468 ms (= 0.896 s - 0.428 s), ata2 takes 840 ms, ata5 takes 1,125 ms,
>> and ata6 takes 1,464 ms:
>>
>> [ 0.427251] calling ahci_pci_driver_init+0x0/0x1a @ 1
>> [ 0.427271] ahci 0000:01:00.1: version 3.0
>> [ 0.427371] ahci 0000:01:00.1: SSS flag set, parallel bus scan disabled
>> [ 0.427405] ahci 0000:01:00.1: AHCI 0001.0301 32 slots 8 ports 6 Gbps 0x33
>> impl SATA mode
>> [ 0.427409] ahci 0000:01:00.1: flags: 64bit ncq sntf stag pm led clo only pmp
>> pio slum part sxs deso sadm sds apst
>> [ 0.427814] scsi host0: ahci
>> [ 0.427895] scsi host1: ahci
>> [ 0.427968] scsi host2: ahci
>> [ 0.428038] scsi host3: ahci
>> [ 0.428113] scsi host4: ahci
>> [ 0.428184] scsi host5: ahci
>> [ 0.428255] scsi host6: ahci
>> [ 0.428325] scsi host7: ahci
>> [ 0.428352] ata1: SATA max UDMA/133 abar m131072@...0600000 port
>> 0xf0600100 irq 36
>> [ 0.428356] ata2: SATA max UDMA/133 abar m131072@...0600000 port
>> 0xf0600180 irq 36
>> [ 0.428359] ata3: DUMMY
>> [ 0.428360] ata4: DUMMY
>> [ 0.428362] ata5: SATA max UDMA/133 abar m131072@...0600000 port
>> 0xf0600300 irq 36
>> [ 0.428365] ata6: SATA max UDMA/133 abar m131072@...0600000 port
>> 0xf0600380 irq 36
>> [ 0.428368] ata7: DUMMY
>> [ 0.428369] ata8: DUMMY
>> [ 0.428481] ahci 0000:07:00.2: AHCI 0001.0301 32 slots 1 ports 6 Gbps 0x1
>> impl SATA mode
>> [ 0.428486] ahci 0000:07:00.2: flags: 64bit ncq sntf ilck pm led clo only pmp
>> fbs pio slum part
>> [ 0.428611] scsi host8: ahci
>> [ 0.428639] ata9: SATA max UDMA/133 abar m4096@...0108000 port
>> 0xf0108100 irq 38
>> [ 0.428653] initcall ahci_pci_driver_init+0x0/0x1a returned 0 after 1367
>> usecs
>> […]
>> [ 0.531949] ata9: SATA link down (SStatus 0 SControl 300)
>> [ 0.895730] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
>> [ 0.924392] ata1.00: ATA-8: ST500LM021-1KJ152, 0005SDM1, max
>> UDMA/133
>> [ 0.924410] ata1.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 32)
>> [ 0.963276] ata1.00: configured for UDMA/133
>> [ 0.963355] scsi 0:0:0:0: Direct-Access ATA ST500LM021-1KJ15 SDM1
>> PQ: 0 ANSI: 5
>> [ 0.963478] sd 0:0:0:0: Attached scsi generic sg0 type 0
>> [ 0.963568] sd 0:0:0:0: [sda] 976773168 512-byte logical blocks: (500 GB/466
>> GiB)
>> [ 0.963594] sd 0:0:0:0: [sda] 4096-byte physical blocks
>> [ 0.963616] sd 0:0:0:0: [sda] Write Protect is off
>> [ 0.963631] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
>> [ 0.963644] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled,
>> doesn't support DPO or FUA
>> [ 0.974119] sda: sda1 sda2 sda3
>> [ 0.974299] sd 0:0:0:0: [sda] Attached SCSI disk
>> [ 1.268377] ata2: SATA link down (SStatus 0 SControl 300)
>> [ 1.580394] ata5: SATA link down (SStatus 0 SControl 300)
>> [ 1.892390] ata6: SATA link down (SStatus 0 SControl 300)
>>
>> With this patch (no delay) device probe for ata1 takes 268 ms
>> (= 0.696 s - 0.428 s), ata2 takes 440 ms, ata5 takes 545 ms, and ata6 takes
>> 650 ms:
>>
>> [ 0.426850] calling ahci_pci_driver_init+0x0/0x1a @ 1
>> [ 0.426869] ahci 0000:01:00.1: version 3.0
>> [ 0.426970] ahci 0000:01:00.1: SSS flag set, parallel bus scan disabled
>> [ 0.427004] ahci 0000:01:00.1: AHCI 0001.0301 32 slots 8 ports 6 Gbps 0x33
>> impl SATA mode
>> [ 0.427008] ahci 0000:01:00.1: flags: 64bit ncq sntf stag pm led clo only pmp
>> pio slum part sxs deso sadm sds apst
>> [ 0.427412] scsi host0: ahci
>> [ 0.427493] scsi host1: ahci
>> [ 0.427569] scsi host2: ahci
>> [ 0.427653] scsi host3: ahci
>> [ 0.427728] scsi host4: ahci
>> [ 0.427801] scsi host5: ahci
>> [ 0.427876] scsi host6: ahci
>> [ 0.427950] scsi host7: ahci
>> [ 0.427978] ata1: SATA max UDMA/133 abar m131072@...0600000 port
>> 0xf0600100 irq 36
>> [ 0.427982] ata2: SATA max UDMA/133 abar m131072@...0600000 port
>> 0xf0600180 irq 36
>> [ 0.427985] ata3: DUMMY
>> [ 0.427986] ata4: DUMMY
>> [ 0.427988] ata5: SATA max UDMA/133 abar m131072@...0600000 port
>> 0xf0600300 irq 36
>> [ 0.427991] ata6: SATA max UDMA/133 abar m131072@...0600000 port
>> 0xf0600380 irq 36
>> [ 0.427994] ata7: DUMMY
>> [ 0.427995] ata8: DUMMY
>> [ 0.428116] ahci 0000:07:00.2: AHCI 0001.0301 32 slots 1 ports 6 Gbps 0x1
>> impl SATA mode
>> [ 0.428124] ahci 0000:07:00.2: flags: 64bit ncq sntf ilck pm led clo only pmp
>> fbs pio slum part
>> [ 0.428250] scsi host8: ahci
>> [ 0.428278] ata9: SATA max UDMA/133 abar m4096@...0108000 port
>> 0xf0108100 irq 38
>> [ 0.428295] initcall ahci_pci_driver_init+0x0/0x1a returned 0 after 1409
>> usecs
>> […]
>> [ 0.532308] ata9: SATA link down (SStatus 0 SControl 300)
>> […]
>> [ 0.696316] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
>> [ 0.725963] ata1.00: ATA-8: ST500LM021-1KJ152, 0005SDM1, max
>> UDMA/133
>> [ 0.725982] ata1.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 32)
>> [ 0.764845] ata1.00: configured for UDMA/133
>> [ 0.764932] scsi 0:0:0:0: Direct-Access ATA ST500LM021-1KJ15 SDM1
>> PQ: 0 ANSI: 5
>> [ 0.765056] sd 0:0:0:0: Attached scsi generic sg0 type 0
>> [ 0.765120] sd 0:0:0:0: [sda] 976773168 512-byte logical blocks: (500 GB/466
>> GiB)
>> [ 0.765147] sd 0:0:0:0: [sda] 4096-byte physical blocks
>> [ 0.765175] sd 0:0:0:0: [sda] Write Protect is off
>> [ 0.765189] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
>> [ 0.765198] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled,
>> doesn't support DPO or FUA
>> [ 0.866546] sda: sda1 sda2 sda3
>> [ 0.867239] sd 0:0:0:0: [sda] Attached SCSI disk
>> [ 0.868330] ata2: SATA link down (SStatus 0 SControl 300)
>> [ 0.973337] ata5: SATA link down (SStatus 0 SControl 300)
>> [ 1.077832] ata6: SATA link down (SStatus 0 SControl 300)
>>
>> Signed-off-by: Paul Menzel <pmenzel@...gen.mpg.de>
>> Cc: Hans de Goede <hdegoede@...hat.com>
>> Cc: Mario Limonciello <mario.limonciello@....com>
>> ---
>> v2: New patch for second SATA controller in Ryzen systems
>>
>> drivers/ata/ahci.c | 1 +
>> 1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
>> index 44b79fe43d13d..ac7f230c12ebc 100644
>> --- a/drivers/ata/ahci.c
>> +++ b/drivers/ata/ahci.c
>> @@ -453,6 +453,7 @@ static const struct pci_device_id ahci_pci_tbl[] = {
>> .class_mask = 0xffffff,
>> board_ahci_al },
>> /* AMD */
>> + { PCI_VDEVICE(AMD, 0x43b7),
>> board_ahci_low_power_no_debounce_delay }, /* AMD 300 Series Chipset
>> SATA Controller */
>> { PCI_VDEVICE(AMD, 0x7800), board_ahci }, /* AMD Hudson-2 */
>> { PCI_VDEVICE(AMD, 0x7801), board_ahci_no_debounce_delay }, /*
>> AMD Hudson-2 (AHCI mode) */
>> { PCI_VDEVICE(AMD, 0x7900), board_ahci }, /* AMD CZ */
>> --
>> 2.30.2
>
> +Nehal from AMD
>
> I seem to recall that we were talking about trying to drop the debounce delay for
> everything, weren't we?
>
> So perhaps it would be right to add a 4th patch in the series to do just that. Then
> If this turns out to be problematic for anything other than the controllers in the
> series that you identified as not problematic then that 4th patch can potentially
> be reverted alone?
Not quite everything :) But you are right, let's try to switch the default
to no delay. I will be posting patches today for that.
Paul,
With these patches, your patches are not necessary anymore as the AMD
chipset falls under the default no-delay. It would be nice if you can test
though.
--
Damien Le Moal
Western Digital Research
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