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author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2016-04-29 18:55:22 +1000 |
---|---|---|
committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-05-11 21:54:30 +1000 |
commit | b575c731fe58c1ecb1247c6a334ba6c7b4c0b480 (patch) | |
tree | fac95487154fecab05a0ea80f7e67030c6079298 /arch/powerpc | |
parent | 7d623e42560ea69eb248d48a1b1b105f28807e6e (diff) | |
download | op-kernel-dev-b575c731fe58c1ecb1247c6a334ba6c7b4c0b480.zip op-kernel-dev-b575c731fe58c1ecb1247c6a334ba6c7b4c0b480.tar.gz |
powerpc/powernv/npu: Add set/unset window helpers
The upcoming NVLink passthrough support will require NPU code to cope
with two DMA windows.
This adds a pnv_npu_set_window() helper which programs 32bit window to
the hardware. This also adds multilevel TCE support.
This adds a pnv_npu_unset_window() helper which removes the DMA window
from the hardware. This does not make difference now as the caller -
pnv_npu_dma_set_bypass() - enables bypass in the hardware but the next
patch will use it to manage TCE table lists for TCE Kill handling.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-By: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc')
-rw-r--r-- | arch/powerpc/platforms/powernv/npu-dma.c | 65 |
1 files changed, 55 insertions, 10 deletions
diff --git a/arch/powerpc/platforms/powernv/npu-dma.c b/arch/powerpc/platforms/powernv/npu-dma.c index bec9267..800d70f 100644 --- a/arch/powerpc/platforms/powernv/npu-dma.c +++ b/arch/powerpc/platforms/powernv/npu-dma.c @@ -159,6 +159,56 @@ static struct pnv_ioda_pe *get_gpu_pci_dev_and_pe(struct pnv_ioda_pe *npe, return pe; } +static long pnv_npu_set_window(struct pnv_ioda_pe *npe, + struct iommu_table *tbl) +{ + struct pnv_phb *phb = npe->phb; + int64_t rc; + const unsigned long size = tbl->it_indirect_levels ? + tbl->it_level_size : tbl->it_size; + const __u64 start_addr = tbl->it_offset << tbl->it_page_shift; + const __u64 win_size = tbl->it_size << tbl->it_page_shift; + + pe_info(npe, "Setting up window %llx..%llx pg=%lx\n", + start_addr, start_addr + win_size - 1, + IOMMU_PAGE_SIZE(tbl)); + + rc = opal_pci_map_pe_dma_window(phb->opal_id, + npe->pe_number, + npe->pe_number, + tbl->it_indirect_levels + 1, + __pa(tbl->it_base), + size << 3, + IOMMU_PAGE_SIZE(tbl)); + if (rc) { + pe_err(npe, "Failed to configure TCE table, err %lld\n", rc); + return rc; + } + pnv_pci_ioda2_tce_invalidate_entire(phb, false); + + return 0; +} + +static long pnv_npu_unset_window(struct pnv_ioda_pe *npe) +{ + struct pnv_phb *phb = npe->phb; + int64_t rc; + + pe_info(npe, "Removing DMA window\n"); + + rc = opal_pci_map_pe_dma_window(phb->opal_id, npe->pe_number, + npe->pe_number, + 0/* levels */, 0/* table address */, + 0/* table size */, 0/* page size */); + if (rc) { + pe_err(npe, "Unmapping failed, ret = %lld\n", rc); + return rc; + } + pnv_pci_ioda2_tce_invalidate_entire(phb, false); + + return 0; +} + void pnv_npu_init_dma_pe(struct pnv_ioda_pe *npe) { struct pnv_ioda_pe *gpe; @@ -200,10 +250,8 @@ void pnv_npu_init_dma_pe(struct pnv_ioda_pe *npe) */ static void pnv_npu_dma_set_32(struct pnv_ioda_pe *npe) { - struct pnv_phb *phb = npe->phb; struct pci_dev *gpdev; struct pnv_ioda_pe *gpe; - struct iommu_table *tbl; int64_t rc; /* @@ -217,14 +265,7 @@ static void pnv_npu_dma_set_32(struct pnv_ioda_pe *npe) if (!gpe) return; - tbl = gpe->table_group.tables[0]; - rc = opal_pci_map_pe_dma_window(phb->opal_id, npe->pe_number, - npe->pe_number, 1, __pa(tbl->it_base), - tbl->it_size << 3, - IOMMU_PAGE_SIZE(tbl)); - if (rc != OPAL_SUCCESS) - pr_warn("%s: Error %lld setting DMA window on PHB#%d-PE#%d\n", - __func__, rc, phb->hose->global_number, npe->pe_number); + rc = pnv_npu_set_window(npe, gpe->table_group.tables[0]); /* * We don't initialise npu_pe->tce32_table as we always use @@ -248,6 +289,10 @@ static int pnv_npu_dma_set_bypass(struct pnv_ioda_pe *npe) if (phb->type != PNV_PHB_NPU || !npe->pdev) return -EINVAL; + rc = pnv_npu_unset_window(npe); + if (rc != OPAL_SUCCESS) + return rc; + /* Enable the bypass window */ top = roundup_pow_of_two(top); |