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spapr: make IOMMU translation go through IOMMUTLBEntry 

The next step is to introduce the translation code that will be used for
IOMMU MemoryRegions, but still do the actual translation in a DMAContext.

Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-04-16 15:05:06 +02:00
parent 2b7dc949e2
commit a71bfbfe9d
1 changed files with 35 additions and 25 deletions
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60
hw/ppc/spapr_iommu.c
View File

@ -68,15 +68,8 @@ static sPAPRTCETable *spapr_tce_find_by_liobn(uint32_t liobn)
return NULL;
}
static int spapr_tce_translate(DMAContext *dma,
dma_addr_t addr,
hwaddr *paddr,
hwaddr *len,
DMADirection dir)
static IOMMUTLBEntry spapr_tce_translate_iommu(sPAPRTCETable *tcet, hwaddr addr)
{
sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);
enum sPAPRTCEAccess access = (dir == DMA_DIRECTION_FROM_DEVICE)
? SPAPR_TCE_WO : SPAPR_TCE_RO;
uint64_t tce;
#ifdef DEBUG_TCE
@ -85,9 +78,13 @@ static int spapr_tce_translate(DMAContext *dma,
#endif
if (tcet->bypass) {
*paddr = addr;
*len = (hwaddr)-1;
return 0;
return (IOMMUTLBEntry) {
.target_as = &address_space_memory,
.iova = 0,
.translated_addr = 0,
.addr_mask = ~(hwaddr)0,
.perm = IOMMU_RW,
};
}
/* Check if we are in bound */
@ -95,28 +92,41 @@ static int spapr_tce_translate(DMAContext *dma,
#ifdef DEBUG_TCE
fprintf(stderr, "spapr_tce_translate out of bounds\n");
#endif
return -EFAULT;
return (IOMMUTLBEntry) { .perm = IOMMU_NONE };
}
tce = tcet->table[addr >> SPAPR_TCE_PAGE_SHIFT].tce;
/* Check TCE */
if (!(tce & access)) {
#ifdef DEBUG_TCE
fprintf(stderr, " -> *paddr=0x%llx, *len=0x%llx\n",
(tce & ~SPAPR_TCE_PAGE_MASK), SPAPR_TCE_PAGE_MASK + 1);
#endif
return (IOMMUTLBEntry) {
.target_as = &address_space_memory,
.iova = addr & ~SPAPR_TCE_PAGE_MASK,
.translated_addr = tce & ~SPAPR_TCE_PAGE_MASK,
.addr_mask = SPAPR_TCE_PAGE_MASK,
.perm = tce,
};
}
static int spapr_tce_translate(DMAContext *dma,
dma_addr_t addr,
hwaddr *paddr,
hwaddr *len,
DMADirection dir)
{
sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);
bool is_write = (dir == DMA_DIRECTION_FROM_DEVICE);
IOMMUTLBEntry entry = spapr_tce_translate_iommu(tcet, addr);
if (!(entry.perm & (1 << is_write))) {
return -EPERM;
}
/* How much til end of page ? */
*len = ((~addr) & SPAPR_TCE_PAGE_MASK) + 1;
/* Translate */
*paddr = (tce & ~SPAPR_TCE_PAGE_MASK) |
(addr & SPAPR_TCE_PAGE_MASK);
#ifdef DEBUG_TCE
fprintf(stderr, " -> *paddr=0x" TARGET_FMT_plx ", *len=0x"
TARGET_FMT_plx "\n", *paddr, *len);
#endif
*paddr = entry.translated_addr | (addr & entry.addr_mask);
*len = (addr | entry.addr_mask) - addr + 1;
return 0;
}