EmbeddedPkg/MmcDxe: Align the ExtCSD buffer

ExtCSD structure may be read via DMA. So align it to
page to avoid data corruption.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jun Nie <jun.nie@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

1 files changed, 14 insertions, 5 deletions

diff --git a/EmbeddedPkg/Universal/MmcDxe/MmcIdentification.c b/EmbeddedPkg/Universal/MmcDxe/MmcIdentification.c
index c28207e2a2..7f74c54696 100644
--- a/EmbeddedPkg/Universal/MmcDxe/MmcIdentification.c
+++ b/EmbeddedPkg/Universal/MmcDxe/MmcIdentification.c
@@ -13,6 +13,7 @@
 **/

 

 #include <Library/BaseMemoryLib.h>

+#include <Library/MemoryAllocationLib.h>

 #include <Library/TimerLib.h>

 

 #include "Mmc.h"

@@ -210,15 +211,19 @@ EmmcIdentificationMode (
   }

 

   // Fetch ECSD

+  MmcHostInstance->CardInfo.ECSDData = AllocatePages (EFI_SIZE_TO_PAGES (sizeof (ECSD)));

+  if (MmcHostInstance->CardInfo.ECSDData == NULL) {

+    return EFI_OUT_OF_RESOURCES;

+  }

   Status = Host->SendCommand (Host, MMC_CMD8, 0);

   if (EFI_ERROR (Status)) {

     DEBUG ((EFI_D_ERROR, "EmmcIdentificationMode(): ECSD fetch error, Status=%r.\n", Status));

   }

 

-  Status = Host->ReadBlockData (Host, 0, 512, (UINT32 *)&(MmcHostInstance->CardInfo.ECSDData));

+  Status = Host->ReadBlockData (Host, 0, 512, (UINT32 *)MmcHostInstance->CardInfo.ECSDData);

   if (EFI_ERROR (Status)) {

     DEBUG ((EFI_D_ERROR, "EmmcIdentificationMode(): ECSD read error, Status=%r.\n", Status));

-    return Status;

+    goto FreePageExit;

   }

 

   // Make sure device exiting data mode

@@ -226,7 +231,7 @@ EmmcIdentificationMode (
     Status = EmmcGetDeviceState (MmcHostInstance, &State);

     if (EFI_ERROR (Status)) {

       DEBUG ((EFI_D_ERROR, "EmmcIdentificationMode(): Failed to get device state, Status=%r.\n", Status));

-      return Status;

+      goto FreePageExit;

     }

   } while (State == EMMC_DATA_STATE);

 

@@ -237,12 +242,16 @@ EmmcIdentificationMode (
   Media->LogicalBlocksPerPhysicalBlock = 1;

   Media->IoAlign = 4;

   // Compute last block using bits [215:212] of the ECSD

-  Media->LastBlock = MmcHostInstance->CardInfo.ECSDData.SECTOR_COUNT - 1; // eMMC isn't supposed to report this for

+  Media->LastBlock = MmcHostInstance->CardInfo.ECSDData->SECTOR_COUNT - 1; // eMMC isn't supposed to report this for

   // Cards <2GB in size, but the model does.

 

   // Setup card type

   MmcHostInstance->CardInfo.CardType = EMMC_CARD;

   return EFI_SUCCESS;

+

+FreePageExit:

+  FreePages (MmcHostInstance->CardInfo.ECSDData, EFI_SIZE_TO_PAGES (sizeof (ECSD)));

+  return Status;

 }

 

 STATIC

@@ -258,7 +267,7 @@ InitializeEmmcDevice (
   UINT32     TimingMode[4] = {EMMCHS52DDR1V2, EMMCHS52DDR1V8, EMMCHS52, EMMCHS26};

 

   Host  = MmcHostInstance->MmcHost;

-  ECSDData = &MmcHostInstance->CardInfo.ECSDData;

+  ECSDData = MmcHostInstance->CardInfo.ECSDData;

   if (ECSDData->DEVICE_TYPE == EMMCBACKWARD)

     return EFI_SUCCESS;