powerpc/pseries: iommu enablement for CMO
To support Cooperative Memory Overcommitment (CMO), we need to check for failure from some of the tce hcalls. These changes for the pseries platform affect the powerpc architecture; patches for the other affected platforms are included in this patch. pSeries platform IOMMU code changes: * platform TCE functions must handle H_NOT_ENOUGH_RESOURCES errors and return an error. Architecture IOMMU code changes: * Calls to ppc_md.tce_build need to check return values and return DMA_MAPPING_ERROR for transient errors. Architecture changes: * struct machdep_calls for tce_build*_pSeriesLP functions need to change to indicate failure. * all other platforms will need updates to iommu functions to match the new calling semantics; they will return 0 on success. The other platforms default configs have been built, but no further testing was performed. Signed-off-by: Robert Jennings <rcj@linux.vnet.ibm.com> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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提交者
Benjamin Herrenschmidt

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ffa5abbd0c
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6490c4903d
@@ -83,7 +83,7 @@ static u32 *iob_l2_base;
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static struct iommu_table iommu_table_iobmap;
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static int iommu_table_iobmap_inited;
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static void iobmap_build(struct iommu_table *tbl, long index,
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static int iobmap_build(struct iommu_table *tbl, long index,
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long npages, unsigned long uaddr,
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enum dma_data_direction direction,
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struct dma_attrs *attrs)
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@@ -108,6 +108,7 @@ static void iobmap_build(struct iommu_table *tbl, long index,
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uaddr += IOBMAP_PAGE_SIZE;
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bus_addr += IOBMAP_PAGE_SIZE;
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}
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return 0;
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}
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