Currently AHCI driver will try to retry all failed packets
regardless of the failure cause. This is a problem in password
unlock flow where number of password retries is tracked by the
device. If user passes a wrong password Ahci driver will try
to send the wrong password multiple times which will exhaust
number of password retries and force the user to restart the
machine. This commit introduces a logic to check for the cause
of packet failure and only retry packets which failed due to
transient conditions on the link. With this patch only packets for
which CRC error is flagged are retried.
Cc: Hao A Wu <hao.a...@intel.com>
Cc: Ray Ni <ray...@intel.com>
Cc: Hunter Chang <hunter.ch...@intel.com>
Cc: Baraneedharan Anbazhagan <anbazha...@hp.com>
Signed-off-by: Mateusz Albecki <mateusz.albe...@intel.com>
---
.../Bus/Ata/AtaAtapiPassThru/AhciMode.c | 71 +++++++++++++++++--
.../Bus/Ata/AtaAtapiPassThru/AhciMode.h | 3 +-
2 files changed, 69 insertions(+), 5 deletions(-)
diff --git a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
index 06c4a3e052..c0c8ffbd9e 100644
--- a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
+++ b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
@@ -737,12 +737,68 @@ AhciRecoverPortError (
Status = AhciResetPort (PciIo, Port);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "Failed to reset the port %d\n", Port));
+ return EFI_DEVICE_ERROR;
}
}
return EFI_SUCCESS;
}
+/**
+ This function will check if the failed command should be retired. Only error
+ conditions which are a result of transient conditions on a link(either to
system or to device).
+
+ @param[in] PciIo Pointer to AHCI controller PciIo.
+ @param[in] Port SATA port index on which to check.
+
+ @retval TRUE Command failure was caused by transient condition and should
be retried
+ @retval FALSE Command should not be retried
+**/
+BOOLEAN
+AhciShouldCmdBeRetried (
+ IN EFI_PCI_IO_PROTOCOL *PciIo,
+ IN UINT8 Port
+ )
+{
+ UINT32 Offset;
+ UINT32 PortInterrupt;
+ UINT32 Serr;
+ UINT32 Tfd;
+
+ Offset = EFI_AHCI_PORT_START + Port * EFI_AHCI_PORT_REG_WIDTH +
EFI_AHCI_PORT_IS;
+ PortInterrupt = AhciReadReg (PciIo, Offset);
+ Offset = EFI_AHCI_PORT_START + Port * EFI_AHCI_PORT_REG_WIDTH +
EFI_AHCI_PORT_SERR;
+ Serr = AhciReadReg (PciIo, Offset);
+ Offset = EFI_AHCI_PORT_START + Port * EFI_AHCI_PORT_REG_WIDTH +
EFI_AHCI_PORT_TFD;
+ Tfd = AhciReadReg (PciIo, Offset);
+
+ //
+ // This can occur if there was a CRC error on a path from system memory to
+ // host controller.
+ //
+ if (PortInterrupt & EFI_AHCI_PORT_IS_HBDS) {
+ return TRUE;
+ //
+ // This can occur if there was a CRC error detected by host during
communication
+ // with the device
+ //
+ } else if ((PortInterrupt & (EFI_AHCI_PORT_IS_IFS | EFI_AHCI_PORT_IS_INFS))
&&
+ (Serr & EFI_AHCI_PORT_SERR_CRCE))
+ {
+ return TRUE;
+ //
+ // This can occur if there was a CRC error detected by device during
communication
+ // with the host. Device returns error status to host with D2H FIS.
+ //
+ } else if ((PortInterrupt & EFI_AHCI_PORT_IS_TFES) &&
+ (Tfd & EFI_AHCI_PORT_TFD_ERR_INT_CRC))
+ {
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
/**
Checks if specified FIS has been received.
@@ -950,6 +1006,7 @@ AhciPioTransfer (
UINT32 PrdCount;
UINT32 Retry;
EFI_STATUS RecoveryStatus;
+ BOOLEAN DoRetry;
if (Read) {
Flag = EfiPciIoOperationBusMasterWrite;
@@ -1027,8 +1084,9 @@ AhciPioTransfer (
if (Status == EFI_DEVICE_ERROR) {
DEBUG ((DEBUG_ERROR, "PIO command failed at retry %d\n", Retry));
+ DoRetry = AhciShouldCmdBeRetried (PciIo, Port); // needs to be
called before error recovery
RecoveryStatus = AhciRecoverPortError (PciIo, Port);
- if (EFI_ERROR (RecoveryStatus)) {
+ if (!DoRetry || EFI_ERROR (RecoveryStatus)) {
break;
}
} else {
@@ -1124,6 +1182,7 @@ AhciDmaTransfer (
EFI_TPL OldTpl;
UINT32 Retry;
EFI_STATUS RecoveryStatus;
+ BOOLEAN DoRetry;
Map = NULL;
PciIo = Instance->PciIo;
@@ -1222,8 +1281,9 @@ AhciDmaTransfer (
Status = AhciWaitUntilFisReceived (PciIo, Port, Timeout, SataFisD2H);
if (Status == EFI_DEVICE_ERROR) {
DEBUG ((DEBUG_ERROR, "DMA command failed at retry: %d\n", Retry));
+ DoRetry = AhciShouldCmdBeRetried (PciIo, Port); // needs to be
called before error recovery
RecoveryStatus = AhciRecoverPortError (PciIo, Port);
- if (EFI_ERROR (RecoveryStatus)) {
+ if (!DoRetry || EFI_ERROR (RecoveryStatus)) {
break;
}
} else {
@@ -1263,6 +1323,7 @@ AhciDmaTransfer (
Status = AhciCheckFisReceived (PciIo, Port, SataFisD2H);
if (Status == EFI_DEVICE_ERROR) {
DEBUG ((DEBUG_ERROR, "DMA command failed at retry: %d\n",
Task->RetryTimes));
+ DoRetry = AhciShouldCmdBeRetried (PciIo, Port); // call this
before error recovery
RecoveryStatus = AhciRecoverPortError (PciIo, Port);
//
// If recovery passed mark the Task as not started and change the
status
@@ -1270,7 +1331,7 @@ AhciDmaTransfer (
// and on next call the command will be re-issued due to IsStart being
FALSE.
// This also makes the next condition decrement the RetryTimes.
//
- if (RecoveryStatus == EFI_SUCCESS) {
+ if (DoRetry && (RecoveryStatus == EFI_SUCCESS)) {
Task->IsStart = FALSE;
Status = EFI_NOT_READY;
}
@@ -1378,6 +1439,7 @@ AhciNonDataTransfer (
EFI_AHCI_COMMAND_LIST CmdList;
UINT32 Retry;
EFI_STATUS RecoveryStatus;
+ BOOLEAN DoRetry;
//
// Package read needed
@@ -1418,8 +1480,9 @@ AhciNonDataTransfer (
Status = AhciWaitUntilFisReceived (PciIo, Port, Timeout, SataFisD2H);
if (Status == EFI_DEVICE_ERROR) {
DEBUG ((DEBUG_ERROR, "Non data transfer failed at retry %d\n", Retry));
+ DoRetry = AhciShouldCmdBeRetried (PciIo, Port); // call this
before error recovery
RecoveryStatus = AhciRecoverPortError (PciIo, Port);
- if (EFI_ERROR (RecoveryStatus)) {
+ if (!DoRetry || EFI_ERROR (RecoveryStatus)) {
break;
}
} else {
diff --git a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.h
b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.h
index d7434b408c..5bb31057ec 100644
--- a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.h
+++ b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.h
@@ -146,7 +146,8 @@ typedef union {
#define EFI_AHCI_PORT_TFD_BSY BIT7
#define EFI_AHCI_PORT_TFD_DRQ BIT3
#define EFI_AHCI_PORT_TFD_ERR BIT0
-#define EFI_AHCI_PORT_TFD_ERR_MASK 0x00FF00
+#define EFI_AHCI_PORT_TFD_ERR_MASK 0x00FF00 // ERROR field is specified
by ATA/ATAPI Command Set specification
+#define EFI_AHCI_PORT_TFD_ERR_INT_CRC BIT15
#define EFI_AHCI_PORT_SIG 0x0024
#define EFI_AHCI_PORT_SSTS 0x0028
#define EFI_AHCI_PORT_SSTS_DET_MASK 0x000F
--
2.39.1.windows.1
---------------------------------------------------------------------
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