OvmfPkg/LsiScsiDxe: Report Targets and LUNs

Implement LsiScsiGetNextTargetLun(), LsiScsiBuildDevicePath(),
LsiScsiGetTargetLun(), and LsiScsiGetNextTarget() to report Targets and
LUNs and build the device path.

This commit also introduces two PCD value: PcdLsiScsiMaxTargetLimit and
PcdLsiScsiMaxLunLimit as the limits for Targets and LUNs.

v3:
  - Update the range of LUN in the assertioin
  - Squash the spurious newline into the previous commit
v2:
  - Zero out (*Target) in LsiScsiGetTargetLun()
  - Use CopyMem() instead of the one-byte shortcut to copy target from
    ScsiDevicePath->Pun
  - Add asserts for PcdLsiScsiMaxTargetLimit and PcdLsiScsiMaxLunLimit

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Signed-off-by: Gary Lin <glin@suse.com>
Message-Id: <20200717061130.8881-7-glin@suse.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

3 files changed, 154 insertions, 2 deletions

diff --git a/OvmfPkg/LsiScsiDxe/LsiScsi.c b/OvmfPkg/LsiScsiDxe/LsiScsi.c
index 67fadb411e..1727792406 100644
--- a/OvmfPkg/LsiScsiDxe/LsiScsi.c
+++ b/OvmfPkg/LsiScsiDxe/LsiScsi.c
@@ -15,6 +15,7 @@
 #include <Library/BaseMemoryLib.h>

 #include <Library/DebugLib.h>

 #include <Library/MemoryAllocationLib.h>

+#include <Library/PcdLib.h>

 #include <Library/UefiBootServicesTableLib.h>

 #include <Library/UefiLib.h>

 #include <Protocol/PciIo.h>

@@ -53,6 +54,49 @@ LsiScsiGetNextTargetLun (
   IN OUT UINT64                      *Lun

   )

 {

+  LSI_SCSI_DEV *Dev;

+  UINTN        Idx;

+  UINT8        *Target;

+  UINT16       LastTarget;

+

+  //

+  // the TargetPointer input parameter is unnecessarily a pointer-to-pointer

+  //

+  Target = *TargetPointer;

+

+  //

+  // Search for first non-0xFF byte. If not found, return first target & LUN.

+  //

+  for (Idx = 0; Idx < TARGET_MAX_BYTES && Target[Idx] == 0xFF; ++Idx)

+    ;

+  if (Idx == TARGET_MAX_BYTES) {

+    SetMem (Target, TARGET_MAX_BYTES, 0x00);

+    *Lun = 0;

+    return EFI_SUCCESS;

+  }

+

+  CopyMem (&LastTarget, Target, sizeof LastTarget);

+

+  //

+  // increment (target, LUN) pair if valid on input

+  //

+  Dev = LSI_SCSI_FROM_PASS_THRU (This);

+  if (LastTarget > Dev->MaxTarget || *Lun > Dev->MaxLun) {

+    return EFI_INVALID_PARAMETER;

+  }

+

+  if (*Lun < Dev->MaxLun) {

+    ++*Lun;

+    return EFI_SUCCESS;

+  }

+

+  if (LastTarget < Dev->MaxTarget) {

+    *Lun = 0;

+    ++LastTarget;

+    CopyMem (Target, &LastTarget, sizeof LastTarget);

+    return EFI_SUCCESS;

+  }

+

   return EFI_NOT_FOUND;

 }

 

@@ -65,7 +109,34 @@ LsiScsiBuildDevicePath (
   IN OUT EFI_DEVICE_PATH_PROTOCOL    **DevicePath

   )

 {

-  return EFI_NOT_FOUND;

+  UINT16           TargetValue;

+  LSI_SCSI_DEV     *Dev;

+  SCSI_DEVICE_PATH *ScsiDevicePath;

+

+  if (DevicePath == NULL) {

+    return EFI_INVALID_PARAMETER;

+  }

+

+  CopyMem (&TargetValue, Target, sizeof TargetValue);

+  Dev = LSI_SCSI_FROM_PASS_THRU (This);

+  if (TargetValue > Dev->MaxTarget || Lun > Dev->MaxLun || Lun > 0xFFFF) {

+    return EFI_NOT_FOUND;

+  }

+

+  ScsiDevicePath = AllocatePool (sizeof *ScsiDevicePath);

+  if (ScsiDevicePath == NULL) {

+    return EFI_OUT_OF_RESOURCES;

+  }

+

+  ScsiDevicePath->Header.Type      = MESSAGING_DEVICE_PATH;

+  ScsiDevicePath->Header.SubType   = MSG_SCSI_DP;

+  ScsiDevicePath->Header.Length[0] = (UINT8)  sizeof *ScsiDevicePath;

+  ScsiDevicePath->Header.Length[1] = (UINT8) (sizeof *ScsiDevicePath >> 8);

+  ScsiDevicePath->Pun              = TargetValue;

+  ScsiDevicePath->Lun              = (UINT16) Lun;

+

+  *DevicePath = &ScsiDevicePath->Header;

+  return EFI_SUCCESS;

 }

 

 EFI_STATUS

@@ -77,7 +148,33 @@ LsiScsiGetTargetLun (
   OUT UINT64                          *Lun

   )

 {

-  return EFI_UNSUPPORTED;

+  SCSI_DEVICE_PATH *ScsiDevicePath;

+  LSI_SCSI_DEV     *Dev;

+  UINT8            *Target;

+

+  if (DevicePath == NULL || TargetPointer == NULL || *TargetPointer == NULL ||

+      Lun == NULL) {

+    return EFI_INVALID_PARAMETER;

+  }

+

+  if (DevicePath->Type    != MESSAGING_DEVICE_PATH ||

+      DevicePath->SubType != MSG_SCSI_DP) {

+    return EFI_UNSUPPORTED;

+  }

+

+  ScsiDevicePath = (SCSI_DEVICE_PATH *) DevicePath;

+  Dev = LSI_SCSI_FROM_PASS_THRU (This);

+  if (ScsiDevicePath->Pun > Dev->MaxTarget ||

+      ScsiDevicePath->Lun > Dev->MaxLun) {

+    return EFI_NOT_FOUND;

+  }

+

+  Target = *TargetPointer;

+  ZeroMem (Target, TARGET_MAX_BYTES);

+  CopyMem (Target, &ScsiDevicePath->Pun, sizeof ScsiDevicePath->Pun);

+  *Lun = ScsiDevicePath->Lun;

+

+  return EFI_SUCCESS;

 }

 

 EFI_STATUS

@@ -107,6 +204,42 @@ LsiScsiGetNextTarget (
   IN OUT UINT8                       **TargetPointer

   )

 {

+  LSI_SCSI_DEV *Dev;

+  UINTN        Idx;

+  UINT8        *Target;

+  UINT16       LastTarget;

+

+  //

+  // the TargetPointer input parameter is unnecessarily a pointer-to-pointer

+  //

+  Target = *TargetPointer;

+

+  //

+  // Search for first non-0xFF byte. If not found, return first target.

+  //

+  for (Idx = 0; Idx < TARGET_MAX_BYTES && Target[Idx] == 0xFF; ++Idx)

+    ;

+  if (Idx == TARGET_MAX_BYTES) {

+    SetMem (Target, TARGET_MAX_BYTES, 0x00);

+    return EFI_SUCCESS;

+  }

+

+  CopyMem (&LastTarget, Target, sizeof LastTarget);

+

+  //

+  // increment target if valid on input

+  //

+  Dev = LSI_SCSI_FROM_PASS_THRU (This);

+  if (LastTarget > Dev->MaxTarget) {

+    return EFI_INVALID_PARAMETER;

+  }

+

+  if (LastTarget < Dev->MaxTarget) {

+    ++LastTarget;

+    CopyMem (Target, &LastTarget, sizeof LastTarget);

+    return EFI_SUCCESS;

+  }

+

   return EFI_NOT_FOUND;

 }

 

@@ -189,6 +322,17 @@ LsiScsiControllerStart (
 

   Dev->Signature = LSI_SCSI_DEV_SIGNATURE;

 

+  STATIC_ASSERT (

+    FixedPcdGet8 (PcdLsiScsiMaxTargetLimit) < 8,

+    "LSI 53C895A supports targets [0..7]"

+    );

+  STATIC_ASSERT (

+    FixedPcdGet8 (PcdLsiScsiMaxLunLimit) < 128,

+    "LSI 53C895A supports LUNs [0..127]"

+    );

+  Dev->MaxTarget = PcdGet8 (PcdLsiScsiMaxTargetLimit);

+  Dev->MaxLun = PcdGet8 (PcdLsiScsiMaxLunLimit);

+

   //

   // Host adapter channel, doesn't exist

   //

diff --git a/OvmfPkg/LsiScsiDxe/LsiScsi.h b/OvmfPkg/LsiScsiDxe/LsiScsi.h
index 751d5b193b..6c6ed25f1c 100644
--- a/OvmfPkg/LsiScsiDxe/LsiScsi.h
+++ b/OvmfPkg/LsiScsiDxe/LsiScsi.h
@@ -14,6 +14,8 @@
 

 typedef struct {

   UINT32                          Signature;

+  UINT8                           MaxTarget;

+  UINT8                           MaxLun;

   EFI_EXT_SCSI_PASS_THRU_MODE     PassThruMode;

   EFI_EXT_SCSI_PASS_THRU_PROTOCOL PassThru;

 } LSI_SCSI_DEV;

diff --git a/OvmfPkg/LsiScsiDxe/LsiScsiDxe.inf b/OvmfPkg/LsiScsiDxe/LsiScsiDxe.inf
index 14f9c68308..6111449577 100644
--- a/OvmfPkg/LsiScsiDxe/LsiScsiDxe.inf
+++ b/OvmfPkg/LsiScsiDxe/LsiScsiDxe.inf
@@ -27,7 +27,9 @@
 [LibraryClasses]

   BaseLib

   BaseMemoryLib

+  DebugLib

   MemoryAllocationLib

+  PcdLib

   UefiBootServicesTableLib

   UefiDriverEntryPoint

   UefiLib

@@ -35,3 +37,7 @@
 [Protocols]

   gEfiExtScsiPassThruProtocolGuid        ## BY_START

   gEfiPciIoProtocolGuid                  ## TO_START

+

+[FixedPcd]

+  gUefiOvmfPkgTokenSpaceGuid.PcdLsiScsiMaxTargetLimit   ## CONSUMES

+  gUefiOvmfPkgTokenSpaceGuid.PcdLsiScsiMaxLunLimit      ## CONSUMES