Re: [PATCH] powerpc/pseries/iommu: Add TCEs for 16GB pages when RAM is pre-mapped

[Harsh Prateek Bora]

On 05/05/26 2:24 am, Gaurav Batra wrote:

@@ -2431,7 +2437,7 @@ static int iommu_mem_notifier(struct notifier_block *nb, 
unsigned long action,
                spin_lock(&dma_win_list_lock);
                list_for_each_entry(window, &dma_win_list, list) {
                        if (window->direct && (arg->start_pfn << PAGE_SHIFT) <
-                               ddw_memory_hotplug_max()) {
+                               pseries_ddw_max_ram) {
                                ret |= 
tce_setrange_multi_pSeriesLP(arg->start_pfn,
                                                arg->nr_pages, window->prop);

I think not only start_pfn, but end_pfn also needs to be within allowed
range, which may require clamping arg->nr_pages if crossing the limits.

                        }
@@ -2444,7 +2450,7 @@ static int iommu_mem_notifier(struct notifier_block *nb, 
unsigned long action,
                spin_lock(&dma_win_list_lock);
                list_for_each_entry(window, &dma_win_list, list) {
                        if (window->direct && (arg->start_pfn << PAGE_SHIFT) <
-                               ddw_memory_hotplug_max()) {
+                               pseries_ddw_max_ram) {
                                ret |= 
tce_clearrange_multi_pSeriesLP(arg->start_pfn,
                                                arg->nr_pages, window->prop);
                        }