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7ed2ed2db2
Code used to create a ddw property that was previously scattered in enable_ddw() is now gathered in ddw_property_create(), which deals with allocation and filling the property, letting it ready for of_property_add(), which now occurs in sequence. This created an opportunity to reorganize the second part of enable_ddw(): Without this patch enable_ddw() does, in order: kzalloc() property & members, create_ddw(), fill ddwprop inside property, ddw_list_new_entry(), do tce_setrange_multi_pSeriesLP_walk in all memory, of_add_property(), and list_add(). With this patch enable_ddw() does, in order: create_ddw(), ddw_property_create(), of_add_property(), ddw_list_new_entry(), do tce_setrange_multi_pSeriesLP_walk in all memory, and list_add(). This change requires of_remove_property() in case anything fails after of_add_property(), but we get to do tce_setrange_multi_pSeriesLP_walk in all memory, which looks the most expensive operation, only if everything else succeeds. Also, the error path got remove_ddw() replaced by a new helper __remove_dma_window(), which only removes the new DDW with an rtas-call. For this, a new helper clean_dma_window() was needed to clean anything that could left if walk_system_ram_range() fails. Signed-off-by: Leonardo Bras <leobras.c@gmail.com> Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210817063929.38701-7-leobras.c@gmail.com |
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