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authorGavin Shan <shangw@linux.vnet.ibm.com>2013-04-25 19:21:01 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-04-26 16:10:00 +1000
commit373f565741a3636954cd87034d9ebb1dc7bfd716 (patch)
tree6c51ef6736305eb478be626028f8eecb1f95f0cf /arch/powerpc/platforms/powernv/pci-ioda.c
parent4cce95508bfeaa1cab74b08558993c81436dcbe0 (diff)
downloadvexpress-lsk-373f565741a3636954cd87034d9ebb1dc7bfd716.tar.gz
powerpc/powernv: Build DMA space for PE on PHB3
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>
Diffstat (limited to 'arch/powerpc/platforms/powernv/pci-ioda.c')
-rw-r--r--arch/powerpc/platforms/powernv/pci-ioda.c99
1 files changed, 93 insertions, 6 deletions
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 1c7e808a130..04a37dc06a7 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -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;
}