Messages in this thread | | | Subject | Re: [PATCH v5 3/4] powerpc/pseries/iommu: Move window-removing part of remove_ddw into remove_dma_window | From | Alexey Kardashevskiy <> | Date | Wed, 5 Aug 2020 13:17:03 +1000 |
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On 05/08/2020 13:04, Leonardo Bras wrote: > Move the window-removing part of remove_ddw into a new function > (remove_dma_window), so it can be used to remove other DMA windows. > > It's useful for removing DMA windows that don't create DIRECT64_PROPNAME > property, like the default DMA window from the device, which uses > "ibm,dma-window". > > Signed-off-by: Leonardo Bras <leobras.c@gmail.com> > Tested-by: David Dai <zdai@linux.vnet.ibm.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> --- > arch/powerpc/platforms/pseries/iommu.c | 45 +++++++++++++++----------- > 1 file changed, 27 insertions(+), 18 deletions(-) > > diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c > index 1a933c4e8bba..4e33147825cc 100644 > --- a/arch/powerpc/platforms/pseries/iommu.c > +++ b/arch/powerpc/platforms/pseries/iommu.c > @@ -781,25 +781,14 @@ static int __init disable_ddw_setup(char *str) > > early_param("disable_ddw", disable_ddw_setup); > > -static void remove_ddw(struct device_node *np, bool remove_prop) > +static void remove_dma_window(struct device_node *np, u32 *ddw_avail, > + struct property *win) > { > struct dynamic_dma_window_prop *dwp; > - struct property *win64; > - u32 ddw_avail[DDW_APPLICABLE_SIZE]; > u64 liobn; > - int ret = 0; > - > - ret = of_property_read_u32_array(np, "ibm,ddw-applicable", > - &ddw_avail[0], DDW_APPLICABLE_SIZE); > - > - win64 = of_find_property(np, DIRECT64_PROPNAME, NULL); > - if (!win64) > - return; > - > - if (ret || win64->length < sizeof(*dwp)) > - goto delprop; > + int ret; > > - dwp = win64->value; > + dwp = win->value; > liobn = (u64)be32_to_cpu(dwp->liobn); > > /* clear the whole window, note the arg is in kernel pages */ > @@ -821,10 +810,30 @@ static void remove_ddw(struct device_node *np, bool remove_prop) > pr_debug("%pOF: successfully removed direct window: rtas returned " > "%d to ibm,remove-pe-dma-window(%x) %llx\n", > np, ret, ddw_avail[DDW_REMOVE_PE_DMA_WIN], liobn); > +} > + > +static void remove_ddw(struct device_node *np, bool remove_prop) > +{ > + struct property *win; > + u32 ddw_avail[DDW_APPLICABLE_SIZE]; > + int ret = 0; > + > + ret = of_property_read_u32_array(np, "ibm,ddw-applicable", > + &ddw_avail[0], DDW_APPLICABLE_SIZE); > + if (ret) > + return; > + > + win = of_find_property(np, DIRECT64_PROPNAME, NULL); > + if (!win) > + return; > + > + if (win->length >= sizeof(struct dynamic_dma_window_prop)) > + remove_dma_window(np, ddw_avail, win); > + > + if (!remove_prop) > + return; > > -delprop: > - if (remove_prop) > - ret = of_remove_property(np, win64); > + ret = of_remove_property(np, win); > if (ret) > pr_warn("%pOF: failed to remove direct window property: %d\n", > np, ret); >
-- Alexey
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