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OPAL_PCI_TCE_KILL
-----------------
int64_t opal_pci_tce_kill(uint64_t phb_id,
uint32_t kill_type,
uint32_t pe_num,
uint32_t tce_size,
uint64_t dma_addr,
uint32_t npages)
An abstraction around TCE kill. This allows host OS kernels to use an OPAL
call if they don't know the model specific invalidation method.
Where kill_type is one of:
enum {
OPAL_PCI_TCE_KILL_PAGES,
OPAL_PCI_TCE_KILL_PE,
OPAL_PCI_TCE_KILL_ALL,
};
Not all PHB types currently support this abstraction. It is supported in
PHB4, which means from POWER9 onwards it will be present.
Returns:
OPAL_PARAMETER: if phb_id is invalid (or similar)
OPAL_UNSUPPORTED: if PHB model doesn't support this call. This is likely
true for systems before POWER9/PHB4.
Do *NOT* rely on this call existing for systems prior to
POWER9 (i.e. PHB4).
Example code (from linux/arch/powerpc/platforms/powernv/pci-ioda.c)
static inline void pnv_pci_ioda2_tce_invalidate_pe(struct pnv_ioda_pe *pe)
{
struct pnv_phb *phb = pe->phb;
if (phb->model == PNV_PHB_MODEL_PHB3 && phb->regs)
pnv_pci_phb3_tce_invalidate_pe(pe);
else
opal_pci_tce_kill(phb->opal_id, OPAL_PCI_TCE_KILL_PE,
pe->pe_number, 0, 0, 0);
}
and
struct pnv_phb *phb = pe->phb;
unsigned int shift = tbl->it_page_shift;
if (phb->model == PNV_PHB_MODEL_PHB3 && phb->regs)
pnv_pci_phb3_tce_invalidate(pe, rm, shift,
index, npages);
else
opal_pci_tce_kill(phb->opal_id,
OPAL_PCI_TCE_KILL_PAGES,
pe->pe_number, 1u << shift,
index << shift, npages);
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