diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/tce.h | 8 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/iommu.c | 61 |
2 files changed, 61 insertions, 8 deletions
diff --git a/arch/powerpc/include/asm/tce.h b/arch/powerpc/include/asm/tce.h index f663634..3dead82 100644 --- a/arch/powerpc/include/asm/tce.h +++ b/arch/powerpc/include/asm/tce.h @@ -26,10 +26,12 @@ /* * Tces come in two formats, one for the virtual bus and a different - * format for PCI + * format for PCI. PCI TCEs can have hardware or software maintianed + * coherency. */ -#define TCE_VB 0 -#define TCE_PCI 1 +#define TCE_VB 0 +#define TCE_PCI 1 +#define TCE_PCI_SW_INVAL 2 /* TCE page size is 4096 bytes (1 << 12) */ diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c index b719d97..ea70667 100644 --- a/arch/powerpc/platforms/pseries/iommu.c +++ b/arch/powerpc/platforms/pseries/iommu.c @@ -52,13 +52,42 @@ #include "plpar_wrappers.h" +static void tce_invalidate_pSeries_sw(struct iommu_table *tbl, + u64 *startp, u64 *endp) +{ + u64 __iomem *invalidate = (u64 __iomem *)tbl->it_index; + unsigned long start, end, inc; + + start = __pa(startp); + end = __pa(endp); + inc = L1_CACHE_BYTES; /* invalidate a cacheline of TCEs at a time */ + + /* If this is non-zero, change the format. We shift the + * address and or in the magic from the device tree. */ + if (tbl->it_busno) { + start <<= 12; + end <<= 12; + inc <<= 12; + start |= tbl->it_busno; + end |= tbl->it_busno; + } + + end |= inc - 1; /* round up end to be different than start */ + + mb(); /* Make sure TCEs in memory are written */ + while (start <= end) { + out_be64(invalidate, start); + start += inc; + } +} + static int tce_build_pSeries(struct iommu_table *tbl, long index, long npages, unsigned long uaddr, enum dma_data_direction direction, struct dma_attrs *attrs) { u64 proto_tce; - u64 *tcep; + u64 *tcep, *tces; u64 rpn; proto_tce = TCE_PCI_READ; // Read allowed @@ -66,7 +95,7 @@ static int tce_build_pSeries(struct iommu_table *tbl, long index, if (direction != DMA_TO_DEVICE) proto_tce |= TCE_PCI_WRITE; - tcep = ((u64 *)tbl->it_base) + index; + tces = tcep = ((u64 *)tbl->it_base) + index; while (npages--) { /* can't move this out since we might cross MEMBLOCK boundary */ @@ -76,18 +105,24 @@ static int tce_build_pSeries(struct iommu_table *tbl, long index, uaddr += TCE_PAGE_SIZE; tcep++; } + + if (tbl->it_type == TCE_PCI_SW_INVAL) + tce_invalidate_pSeries_sw(tbl, tces, tcep - 1); return 0; } static void tce_free_pSeries(struct iommu_table *tbl, long index, long npages) { - u64 *tcep; + u64 *tcep, *tces; - tcep = ((u64 *)tbl->it_base) + index; + tces = tcep = ((u64 *)tbl->it_base) + index; while (npages--) *(tcep++) = 0; + + if (tbl->it_type == TCE_PCI_SW_INVAL) + tce_invalidate_pSeries_sw(tbl, tces, tcep - 1); } static unsigned long tce_get_pseries(struct iommu_table *tbl, long index) @@ -425,7 +460,7 @@ static void iommu_table_setparms(struct pci_controller *phb, struct iommu_table *tbl) { struct device_node *node; - const unsigned long *basep; + const unsigned long *basep, *sw_inval; const u32 *sizep; node = phb->dn; @@ -462,6 +497,22 @@ static void iommu_table_setparms(struct pci_controller *phb, tbl->it_index = 0; tbl->it_blocksize = 16; tbl->it_type = TCE_PCI; + + sw_inval = of_get_property(node, "linux,tce-sw-invalidate-info", NULL); + if (sw_inval) { + /* + * This property contains information on how to + * invalidate the TCE entry. The first property is + * the base MMIO address used to invalidate entries. + * The second property tells us the format of the TCE + * invalidate (whether it needs to be shifted) and + * some magic routing info to add to our invalidate + * command. + */ + tbl->it_index = (unsigned long) ioremap(sw_inval[0], 8); + tbl->it_busno = sw_inval[1]; /* overload this with magic */ + tbl->it_type = TCE_PCI_SW_INVAL; + } } /* |