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powerpc/powernv: Build DMA space for PE on PHB3

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The patch intends to build 32-bits DMA space for individual PEs on
PHB3. The TVE# is recognized by the combo of PE# and fixed bits
from DMA address, which is zero for 32-bits DMA space.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Gavin Shan 2013-04-25 19:21:01 +00:00 committed by Benjamin Herrenschmidt
parent 4cce95508b
commit 373f565741
1 changed files with 93 additions and 6 deletions
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99
arch/powerpc/platforms/powernv/pci-ioda.c
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@ -600,9 +600,8 @@ static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
*/
tbl->it_busno = 0;
tbl->it_index = (unsigned long)ioremap(be64_to_cpup(swinvp), 8);
tbl->it_type = TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE;
if (phb->type == PNV_PHB_IODA1)
tbl->it_type |= TCE_PCI_SWINV_PAIR;
tbl->it_type = TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE |
TCE_PCI_SWINV_PAIR;
}
iommu_init_table(tbl, phb->hose->node);
@ -620,6 +619,81 @@ static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
__free_pages(tce_mem, get_order(TCE32_TABLE_SIZE * segs));
}
static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
struct pnv_ioda_pe *pe)
{
struct page *tce_mem = NULL;
void *addr;
const __be64 *swinvp;
struct iommu_table *tbl;
unsigned int tce_table_size, end;
int64_t rc;
/* We shouldn't already have a 32-bit DMA associated */
if (WARN_ON(pe->tce32_seg >= 0))
return;
/* The PE will reserve all possible 32-bits space */
pe->tce32_seg = 0;
end = (1 << ilog2(phb->ioda.m32_pci_base));
tce_table_size = (end / 0x1000) * 8;
pe_info(pe, "Setting up 32-bit TCE table at 0..%08x\n",
end);
/* Allocate TCE table */
tce_mem = alloc_pages_node(phb->hose->node, GFP_KERNEL,
get_order(tce_table_size));
if (!tce_mem) {
pe_err(pe, "Failed to allocate a 32-bit TCE memory\n");
goto fail;
}
addr = page_address(tce_mem);
memset(addr, 0, tce_table_size);
/*
* Map TCE table through TVT. The TVE index is the PE number
* shifted by 1 bit for 32-bits DMA space.
*/
rc = opal_pci_map_pe_dma_window(phb->opal_id, pe->pe_number,
pe->pe_number << 1, 1, __pa(addr),
tce_table_size, 0x1000);
if (rc) {
pe_err(pe, "Failed to configure 32-bit TCE table,"
" err %ld\n", rc);
goto fail;
}
/* Setup linux iommu table */
tbl = &pe->tce32_table;
pnv_pci_setup_iommu_table(tbl, addr, tce_table_size, 0);
/* OPAL variant of PHB3 invalidated TCEs */
swinvp = of_get_property(phb->hose->dn, "ibm,opal-tce-kill", NULL);
if (swinvp) {
/* We need a couple more fields -- an address and a data
* to or. Since the bus is only printed out on table free
* errors, and on the first pass the data will be a relative
* bus number, print that out instead.
*/
tbl->it_busno = 0;
tbl->it_index = (unsigned long)ioremap(be64_to_cpup(swinvp), 8);
tbl->it_type = TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE;
}
iommu_init_table(tbl, phb->hose->node);
if (pe->pdev)
set_iommu_table_base(&pe->pdev->dev, tbl);
else
pnv_ioda_setup_bus_dma(pe, pe->pbus);
return;
fail:
if (pe->tce32_seg >= 0)
pe->tce32_seg = -1;
if (tce_mem)
__free_pages(tce_mem, get_order(tce_table_size));
}
static void pnv_ioda_setup_dma(struct pnv_phb *phb)
{
struct pci_controller *hose = phb->hose;
@ -662,9 +736,22 @@ static void pnv_ioda_setup_dma(struct pnv_phb *phb)
if (segs > remaining)
segs = remaining;
}
pe_info(pe, "DMA weight %d, assigned %d DMA32 segments\n",
pe->dma_weight, segs);
pnv_pci_ioda_setup_dma_pe(phb, pe, base, segs);
/*
* For IODA2 compliant PHB3, we needn't care about the weight.
* The all available 32-bits DMA space will be assigned to
* the specific PE.
*/
if (phb->type == PNV_PHB_IODA1) {
pe_info(pe, "DMA weight %d, assigned %d DMA32 segments\n",
pe->dma_weight, segs);
pnv_pci_ioda_setup_dma_pe(phb, pe, base, segs);
} else {
pe_info(pe, "Assign DMA32 space\n");
segs = 0;
pnv_pci_ioda2_setup_dma_pe(phb, pe);
}
remaining -= segs;
base += segs;
}