[xen staging] iommu/ipmmu-vmsa: Add helper functions for MMU "context" registers

[patchbot@xxxxxxx]

commit cbba37c8a3d07ae3b17eee7e4aaadfb23cf4feec
Author:     Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
AuthorDate: Mon Dec 20 23:15:49 2021 +0200
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Thu Jan 27 12:33:30 2022 +0000

    iommu/ipmmu-vmsa: Add helper functions for MMU "context" registers
    
    This is a non-verbatim port of corresponding Linux upsteam commit:
    16d9454f5e0447f9c19cbf350b35ed377b9f64eb
    
    Original commit message:
     commit 16d9454f5e0447f9c19cbf350b35ed377b9f64eb
     Author: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
     Date:   Wed Nov 6 11:35:47 2019 +0900
    
      iommu/ipmmu-vmsa: Add helper functions for MMU "context" registers
    
      Since we will have changed memory mapping of the IPMMU in the future,
      This patch adds helper functions ipmmu_ctx_{reg,read,write}()
      for MMU "context" registers. No behavior change.
    
      Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
      Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
      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.
    
    Besides changes done in the original commit, we also need to update
    an extra call sites which Linux driver doesn't have, but Xen driver
    has such as ipmmu_ctx_write_cache(), etc.
    
    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 | 31 ++++++++++++++++++++++++-------
 1 file changed, 24 insertions(+), 7 deletions(-)

diff --git a/xen/drivers/passthrough/arm/ipmmu-vmsa.c 
b/xen/drivers/passthrough/arm/ipmmu-vmsa.c
index 4a8a974442..ce5c3bc1e0 100644
--- a/xen/drivers/passthrough/arm/ipmmu-vmsa.c
+++ b/xen/drivers/passthrough/arm/ipmmu-vmsa.c
@@ -307,18 +307,35 @@ static void ipmmu_write(struct ipmmu_vmsa_device *mmu, 
uint32_t offset,
     writel(data, mmu->base + offset);
 }
 
+static unsigned int ipmmu_ctx_reg(struct ipmmu_vmsa_device *mmu,
+                                  unsigned int context_id, uint32_t reg)
+{
+    return context_id * IM_CTX_SIZE + reg;
+}
+
+static uint32_t ipmmu_ctx_read(struct ipmmu_vmsa_device *mmu,
+                               unsigned int context_id, uint32_t reg)
+{
+    return ipmmu_read(mmu, ipmmu_ctx_reg(mmu, context_id, reg));
+}
+
+static void ipmmu_ctx_write(struct ipmmu_vmsa_device *mmu,
+                            unsigned int context_id, uint32_t reg,
+                            uint32_t data)
+{
+    ipmmu_write(mmu, ipmmu_ctx_reg(mmu, context_id, reg), data);
+}
+
 static uint32_t ipmmu_ctx_read_root(struct ipmmu_vmsa_domain *domain,
                                     uint32_t reg)
 {
-    return ipmmu_read(domain->mmu->root,
-                      domain->context_id * IM_CTX_SIZE + reg);
+    return ipmmu_ctx_read(domain->mmu->root, domain->context_id, reg);
 }
 
 static void ipmmu_ctx_write_root(struct ipmmu_vmsa_domain *domain,
                                  uint32_t reg, uint32_t data)
 {
-    ipmmu_write(domain->mmu->root,
-                domain->context_id * IM_CTX_SIZE + reg, data);
+    ipmmu_ctx_write(domain->mmu->root, domain->context_id, reg, data);
 }
 
 static void ipmmu_ctx_write_cache(struct ipmmu_vmsa_domain *domain,
@@ -329,8 +346,8 @@ static void ipmmu_ctx_write_cache(struct ipmmu_vmsa_domain 
*domain,
 
     /* Mask fields which are implemented in IPMMU-MM only. */
     if ( !ipmmu_is_root(domain->mmu) )
-        ipmmu_write(domain->mmu, domain->context_id * IM_CTX_SIZE + reg,
-                    data & IMCTR_COMMON_MASK);
+        ipmmu_ctx_write(domain->mmu, domain->context_id, reg,
+                        data & IMCTR_COMMON_MASK);
 }
 
 /*
@@ -693,7 +710,7 @@ static void ipmmu_device_reset(struct ipmmu_vmsa_device 
*mmu)
 
     /* Disable all contexts. */
     for ( i = 0; i < mmu->num_ctx; ++i )
-        ipmmu_write(mmu, i * IM_CTX_SIZE + IMCTR, 0);
+        ipmmu_ctx_write(mmu, i, IMCTR, 0);
 }
 
 /* R-Car Gen3 SoCs product and cut information. */
--
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