[xen staging] iommu/ipmmu-vmsa: Add utlb_offset_base

[patchbot@xxxxxxx]

commit 6e94086a86b8f246c754f50cb9f4adcbf02ce1b2
Author:     Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
AuthorDate: Mon Dec 20 23:15:53 2021 +0200
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Thu Jan 27 12:34:05 2022 +0000

    iommu/ipmmu-vmsa: Add utlb_offset_base
    
    This is a non-verbatim port of corresponding Linux upsteam commit:
    1289f7f15001c7ed36be6d23cb145c1d5feacdc8
    
    Original commit message:
     commit 1289f7f15001c7ed36be6d23cb145c1d5feacdc8
     Author: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
     Date:   Wed Nov 6 11:35:50 2019 +0900
    
      iommu/ipmmu-vmsa: Add utlb_offset_base
    
      Since we will have changed memory mapping of the IPMMU in the future,
      this patch adds a utlb_offset_base into struct ipmmu_features
      for IMUCTR and IMUASID registers. No behavior change.
    
      Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
      Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
      Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
    
    **********
    
    This is a prereq work needed to add support for S4 series easily
    in the future.
    
    Almost the same change as original commit makes, but without updating
    struct ipmmu_features_default which Xen driver doesn't have (there is
    no support of old Arm32 based Gen2 SoCs).
    
    No change in behavior.
    
    Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
    Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 xen/drivers/passthrough/arm/ipmmu-vmsa.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xen/drivers/passthrough/arm/ipmmu-vmsa.c 
b/xen/drivers/passthrough/arm/ipmmu-vmsa.c
index ca33456ac2..d8f96fcd3d 100644
--- a/xen/drivers/passthrough/arm/ipmmu-vmsa.c
+++ b/xen/drivers/passthrough/arm/ipmmu-vmsa.c
@@ -111,6 +111,7 @@ struct ipmmu_features {
     unsigned int num_utlbs;
     unsigned int ctx_offset_base;
     unsigned int ctx_offset_stride;
+    unsigned int utlb_offset_base;
 };
 
 /* Root/Cache IPMMU device's information */
@@ -374,7 +375,7 @@ static void ipmmu_ctx_write_all(struct ipmmu_vmsa_domain 
*domain,
 
 static uint32_t ipmmu_utlb_reg(struct ipmmu_vmsa_device *mmu, uint32_t reg)
 {
-    return reg;
+    return mmu->features->utlb_offset_base + reg;
 }
 
 static void ipmmu_imuasid_write(struct ipmmu_vmsa_device *mmu,
@@ -738,6 +739,7 @@ static const struct ipmmu_features ipmmu_features_rcar_gen3 
= {
     .num_utlbs = 48,
     .ctx_offset_base = 0,
     .ctx_offset_stride = 0x40,
+    .utlb_offset_base = 0,
 };
 
 static void ipmmu_device_reset(struct ipmmu_vmsa_device *mmu)
--
generated by git-patchbot for /home/xen/git/xen.git#staging