diff options
| author | Oliver O'Halloran <oohall@gmail.com> | 2020-04-06 13:07:39 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-28 23:24:37 +1000 |
| commit | 6984856865b55c9c1ee0814c30296119cd8ba511 (patch) | |
| tree | 8cdf5dabd8532222000c0d186fa6e91b866acfdd | |
| parent | d4539074b0e9c5fa6508e8c33aaf51abc8ff6e91 (diff) | |
powerpc/powernv/npu: Clean up compound table group initialisation
Re-work the control flow a bit so what's going on is a little clearer.
This also ensures the table_group is only initialised once in the P9
case. This shouldn't be a functional change since all the GPU PCI
devices should have the same table_group configuration, but it does
look strange.
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200406030745.24595-2-oohall@gmail.com
| -rw-r--r-- | arch/powerpc/platforms/powernv/npu-dma.c | 46 |
1 files changed, 21 insertions, 25 deletions
diff --git a/arch/powerpc/platforms/powernv/npu-dma.c b/arch/powerpc/platforms/powernv/npu-dma.c index b95b9e3c4c98..de617549c9a3 100644 --- a/arch/powerpc/platforms/powernv/npu-dma.c +++ b/arch/powerpc/platforms/powernv/npu-dma.c @@ -427,7 +427,7 @@ static void pnv_comp_attach_table_group(struct npu_comp *npucomp, struct iommu_table_group *pnv_try_setup_npu_table_group(struct pnv_ioda_pe *pe) { - struct iommu_table_group *table_group; + struct iommu_table_group *compound_group; struct npu_comp *npucomp; struct pci_dev *gpdev = NULL; struct pci_controller *hose; @@ -446,36 +446,32 @@ struct iommu_table_group *pnv_try_setup_npu_table_group(struct pnv_ioda_pe *pe) hose = pci_bus_to_host(npdev->bus); if (hose->npu) { - table_group = &hose->npu->npucomp.table_group; - - if (!table_group->group) { - table_group->ops = &pnv_npu_peers_ops; - iommu_register_group(table_group, - hose->global_number, - pe->pe_number); - } + /* P9 case: compound group is per-NPU (all gpus, all links) */ + npucomp = &hose->npu->npucomp; } else { - /* Create a group for 1 GPU and attached NPUs for POWER8 */ - pe->npucomp = kzalloc(sizeof(*pe->npucomp), GFP_KERNEL); - table_group = &pe->npucomp->table_group; - table_group->ops = &pnv_npu_peers_ops; - iommu_register_group(table_group, hose->global_number, - pe->pe_number); + /* P8 case: Compound group is per-GPU (1 gpu, 2 links) */ + npucomp = pe->npucomp = kzalloc(sizeof(*npucomp), GFP_KERNEL); } - /* Steal capabilities from a GPU PE */ - table_group->max_dynamic_windows_supported = - pe->table_group.max_dynamic_windows_supported; - table_group->tce32_start = pe->table_group.tce32_start; - table_group->tce32_size = pe->table_group.tce32_size; - table_group->max_levels = pe->table_group.max_levels; - if (!table_group->pgsizes) - table_group->pgsizes = pe->table_group.pgsizes; + compound_group = &npucomp->table_group; + if (!compound_group->group) { + compound_group->ops = &pnv_npu_peers_ops; + iommu_register_group(compound_group, hose->global_number, + pe->pe_number); + + /* Steal capabilities from a GPU PE */ + compound_group->max_dynamic_windows_supported = + pe->table_group.max_dynamic_windows_supported; + compound_group->tce32_start = pe->table_group.tce32_start; + compound_group->tce32_size = pe->table_group.tce32_size; + compound_group->max_levels = pe->table_group.max_levels; + if (!compound_group->pgsizes) + compound_group->pgsizes = pe->table_group.pgsizes; + } - npucomp = container_of(table_group, struct npu_comp, table_group); pnv_comp_attach_table_group(npucomp, pe); - return table_group; + return compound_group; } struct iommu_table_group *pnv_npu_compound_attach(struct pnv_ioda_pe *pe) |