drm/msm/adreno: Add MMU fault handler to adreno_gpu_func

Move MMU fault handler for each generation to adreno function list. This
will help to use common code for mmu pagefault handler registration between
a6x/a7x and a8x layer.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Akhil P Oommen <akhilpo@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/689007/
Message-ID: <20251118-kaana-gpu-support-v4-8-86eeb8e93fb6@oss.qualcomm.com>
Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>

Author: akhilpo-qcom

drivers/gpu/drm/msm/adreno/a6xx_gpu.c

@@ -2641,7 +2641,7 @@ static struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
 	adreno_gpu->uche_trap_base = 0x1fffffffff000ull;
 
 	msm_mmu_set_fault_handler(to_msm_vm(gpu->vm)->mmu, gpu,
-				  a6xx_fault_handler);
+				  adreno_gpu->funcs->mmu_fault_handler);
 
 	ret = a6xx_calc_ubwc_config(adreno_gpu);
 	if (ret) {
@@ -2686,6 +2686,7 @@ const struct adreno_gpu_funcs a6xx_gpu_funcs = {
 	.init = a6xx_gpu_init,
 	.get_timestamp = a6xx_gmu_get_timestamp,
 	.bus_halt = a6xx_bus_clear_pending_transactions,
+	.mmu_fault_handler = a6xx_fault_handler,
 };
 
 const struct adreno_gpu_funcs a6xx_gmuwrapper_funcs = {
@@ -2717,6 +2718,7 @@ const struct adreno_gpu_funcs a6xx_gmuwrapper_funcs = {
 	.init = a6xx_gpu_init,
 	.get_timestamp = a6xx_get_timestamp,
 	.bus_halt = a6xx_bus_clear_pending_transactions,
+	.mmu_fault_handler = a6xx_fault_handler,
 };
 
 const struct adreno_gpu_funcs a7xx_gpu_funcs = {
@@ -2750,4 +2752,5 @@ const struct adreno_gpu_funcs a7xx_gpu_funcs = {
 	.init = a6xx_gpu_init,
 	.get_timestamp = a6xx_gmu_get_timestamp,
 	.bus_halt = a6xx_bus_clear_pending_transactions,
+	.mmu_fault_handler = a6xx_fault_handler,
 };

drivers/gpu/drm/msm/adreno/adreno_gpu.h

@@ -78,6 +78,7 @@ struct adreno_gpu_funcs {
 	struct msm_gpu *(*init)(struct drm_device *dev);
 	int (*get_timestamp)(struct msm_gpu *gpu, uint64_t *value);
 	void (*bus_halt)(struct adreno_gpu *adreno_gpu, bool gx_off);
+	int (*mmu_fault_handler)(void *arg, unsigned long iova, int flags, void *data);
 };
 
 struct adreno_reglist {