Thank you for your recent detailed email reply. I'm not good at sending patches.
I have already sent another patch which met your request by git send-email format before i found your email address, i hope you can also receive it, i.m so sorry.
for your question about how i test this:
1:boot OS from storages other than AHCI with IOV enabled,eg,XHCI;
2:attach an SSD(not ODD) to SATA-AHCI port in zhaoxin platform;
3:build seabios in debug mode and run the qemu script in attachment document;
4: we can failed log in previous mail.


发件人: RunaGuo-oc
发送时间: 2021年3月28日 19:23
收件人: Gerd Hoffmann
抄送: seabios@seabios.org
主题: 答复: [SeaBIOS] [PATCH] AHCI: The attached ATA device cannot be detected when binding AHCI controller to Virtual Machine

I am so sorry to reply late.

Here is the newly rebase patch, pls help  check, thanks.

1: For ATA device, the first ATA_CMD_IDENTIFY_PACKET_DEVICE command will be failed with PORT_IRQ_TF set to 1 from ahci spec;
2: For seabios, this fail will be considered as timeout for it only polling PORT_IRQ_D2H_REG/PIO_FIS;
3: From ahci spec, I have not yet found  any evidences which can be use to combine the above fail with these above error;

May be, we can also add PORT_IRQ_TF_ERR bit check while polling command completion?

Signed-off-by: zhaoxin\runaguooc <RunaGuo-oc@zhaoxin.com>
 src/hw/ahci.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/hw/ahci.c b/src/hw/ahci.c
index d45b430..998b5fe 100644
--- a/src/hw/ahci.c
+++ b/src/hw/ahci.c
@@ -143,7 +143,8 @@ static int ahci_command(struct ahci_port_s *port_gf, int iswrite, int isatapi,
                     error  = GET_LOWFLAT(fis->psfis[3]);
-                if (intbits & 0x01) {
+                if (intbits & (0x01| PORT_IRQ_TF_ERR)) {
                     status = GET_LOWFLAT(fis->rfis[2]);
                     error  = GET_LOWFLAT(fis->rfis[3]);

发件人: Gerd Hoffmann <kraxel@redhat.com>
发送时间: 2020年9月30日 18:58:20
收件人: RunaGuo-oc
抄送: seabios@seabios.org
主题: Re: [SeaBIOS] [PATCH] AHCI: The attached ATA device cannot be detected when binding AHCI controller to Virtual Machine
On Tue, Aug 04, 2020 at 11:17:05AM -0000, RunaGuo-oc@zhaoxin.com wrote:
> When binding AHCI controller to virtual machine, the attached ATA device cannot be recognized for the following reason:
>  The first Identify PACKET CMD will be failed without dobut which will lead PORT_IRQ_TF_ERR be set in PxIS due to ERR bit set to 1 in D2H Register FIS(PxTFD.STS.ERR=1). In this case, the first CMD will be timeout for seabios only polling PORT_IRQ_D2H_REG_FIS & PORT_IRQ_PIOS_FIS before triggering error handling which leads AHCI controller is an error state, then the second IDENTIFY CMD cannot be issued by AHCI controller, no ATA device will be detected.
>  In AHCI spec HBA Port State Machine section( and, we can see this sequence: RegFIS:Entry --> ERR:FatalTaskfile (PxTFD.STS.ERR=1) --> ERR:WaitForClear, no entry for PORT_IRQ_D2H_REG_FIS/PORT_IRQ_PIOS_FIS to be set at this time.
>  May be we can also add PORT_IRQ_TF_ERR bit check when polling command completion status?
>  fail log:
>  02.386: |bffa6000| AHCI/1: link up
>  02.387: |bffa6000| AHCI/1: send cmd ...
>  02.387: |bffa7000| phys_free bffa9c00 (detail=0xbffaa320)
>  02.396: |bffa7000| phys_free bffaa200 (detail=0xbffaa1d0)
>  02.396: |bffa7000| phys_free bffaa000 (detail=0xbffaa1a0)
>  02.396: |bffa7000| phys_free bffaa380 (detail=0xbffaa350)
>  02.400: \bffa7000/ End thread
>  02.401: phys_free bffa7000 (detail=0xbffaa170)
>  34.391: |bffa6000| WARNING - Timeout at ahci_command:153!
>  34.392: |bffa6000| AHCI/1: send cmd ...
>  66.397: |bffa6000| WARNING - Timeout at ahci_command:153!
> Signed-off-by: zhaoxin\runaguooc <RunaGuo-oc@zhaoxin.com>

Patch doesn't apply to git master.  Can you rebase and resend?  And
while being at it wrap the commit message to hot have lines longer than
80 chars?