[PATCH 5/7] drm/etnaviv: prepare for shared_context support for iommuv2

[Icenowy Zheng]

As we have some unfortunate GPUs with IOMMUv2 but broken PTA (reloading
a different page table at runtime always fails), shared_context is now
not a v1-only thing.

Move it out of the v1 struct in the union.

Signed-off-by: Icenowy Zheng <u...@icenowy.me>
---
 drivers/gpu/drm/etnaviv/etnaviv_iommu.c |  8 ++++----
 drivers/gpu/drm/etnaviv/etnaviv_mmu.h   | 22 +++++++---------------
 2 files changed, 11 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_iommu.c 
b/drivers/gpu/drm/etnaviv/etnaviv_iommu.c
index afe5dd6a9925b..6fdce63b9971a 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_iommu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_iommu.c
@@ -39,7 +39,7 @@ static void etnaviv_iommuv1_free(struct etnaviv_iommu_context 
*context)
        dma_free_wc(context->global->dev, PT_SIZE, v1_context->pgtable_cpu,
                    v1_context->pgtable_dma);
 
-       context->global->v1.shared_context = NULL;
+       context->global->shared_context = NULL;
 
        kfree(v1_context);
 }
@@ -136,8 +136,8 @@ etnaviv_iommuv1_context_alloc(struct etnaviv_iommu_global 
*global)
         * a stop the world operation, so we only support a single shared
         * context with this version.
         */
-       if (global->v1.shared_context) {
-               context = global->v1.shared_context;
+       if (global->shared_context) {
+               context = global->shared_context;
                etnaviv_iommu_context_get(context);
                mutex_unlock(&global->lock);
                return context;
@@ -163,7 +163,7 @@ etnaviv_iommuv1_context_alloc(struct etnaviv_iommu_global 
*global)
        mutex_init(&context->lock);
        INIT_LIST_HEAD(&context->mappings);
        drm_mm_init(&context->mm, GPU_MEM_START, PT_ENTRIES * SZ_4K);
-       context->global->v1.shared_context = context;
+       context->global->shared_context = context;
 
        mutex_unlock(&global->lock);
 
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.h 
b/drivers/gpu/drm/etnaviv/etnaviv_mmu.h
index 7f8ac01785474..2ec4acda02bc6 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.h
+++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.h
@@ -49,21 +49,13 @@ struct etnaviv_iommu_global {
 
        u32 memory_base;
 
-       /*
-        * This union holds members needed by either MMUv1 or MMUv2, which
-        * can not exist at the same time.
-        */
-       union {
-               struct {
-                       struct etnaviv_iommu_context *shared_context;
-               } v1;
-               struct {
-                       /* P(age) T(able) A(rray) */
-                       u64 *pta_cpu;
-                       dma_addr_t pta_dma;
-                       DECLARE_BITMAP(pta_alloc, ETNAVIV_PTA_ENTRIES);
-               } v2;
-       };
+       struct etnaviv_iommu_context *shared_context;
+       struct {
+               /* P(age) T(able) A(rray) */
+               u64 *pta_cpu;
+               dma_addr_t pta_dma;
+               DECLARE_BITMAP(pta_alloc, ETNAVIV_PTA_ENTRIES);
+       } v2;
 };
 
 struct etnaviv_iommu_context {
-- 
2.50.1