diff options
| author | Alistair Popple <alistair@popple.id.au> | 2017-09-06 11:49:00 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-11-13 08:00:30 +1100 |
| commit | 1b2c2b12386f9bb009a2249eca00e01a9d76d7c1 (patch) | |
| tree | e521dd43b3565c4f3157f277a9b4647393b37ea4 | |
| parent | 2a31ad093bb1b8c1f1e04cbe222ad17bc09c4534 (diff) | |
powerpc/powernv/npu: Don't explicitly flush nmmu tlb
The nest mmu required an explicit flush as a tlbi would not flush it in the
same way as the core. However an alternate firmware fix exists which should
eliminate the need for this flush, so instead add a device-tree property
(ibm,nmmu-flush) on the NVLink2 PHB to enable it only if required.
Signed-off-by: Alistair Popple <alistair@popple.id.au>
Reviewed-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
| -rw-r--r-- | arch/powerpc/platforms/powernv/npu-dma.c | 28 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/pci.h | 3 |
2 files changed, 26 insertions, 5 deletions
diff --git a/arch/powerpc/platforms/powernv/npu-dma.c b/arch/powerpc/platforms/powernv/npu-dma.c index 2fff9a65975b..f6cbc1a71472 100644 --- a/arch/powerpc/platforms/powernv/npu-dma.c +++ b/arch/powerpc/platforms/powernv/npu-dma.c @@ -395,6 +395,7 @@ struct npu_context { struct pci_dev *npdev[NV_MAX_NPUS][NV_MAX_LINKS]; struct mmu_notifier mn; struct kref kref; + bool nmmu_flush; /* Callback to stop translation requests on a given GPU */ struct npu_context *(*release_cb)(struct npu_context *, void *); @@ -545,11 +546,13 @@ static void mmio_invalidate(struct npu_context *npu_context, int va, struct mmio_atsd_reg mmio_atsd_reg[NV_MAX_NPUS]; unsigned long pid = npu_context->mm->context.id; - /* - * Unfortunately the nest mmu does not support flushing specific - * addresses so we have to flush the whole mm. - */ - flush_all_mm(npu_context->mm); + if (npu_context->nmmu_flush) + /* + * Unfortunately the nest mmu does not support flushing specific + * addresses so we have to flush the whole mm once before + * shooting down the GPU translation. + */ + flush_all_mm(npu_context->mm); /* * Loop over all the NPUs this process is active on and launch @@ -722,6 +725,16 @@ struct npu_context *pnv_npu2_init_context(struct pci_dev *gpdev, return ERR_PTR(-ENODEV); npu_context->npdev[npu->index][nvlink_index] = npdev; + if (!nphb->npu.nmmu_flush) { + /* + * If we're not explicitly flushing ourselves we need to mark + * the thread for global flushes + */ + npu_context->nmmu_flush = false; + mm_context_add_copro(mm); + } else + npu_context->nmmu_flush = true; + return npu_context; } EXPORT_SYMBOL(pnv_npu2_init_context); @@ -731,6 +744,9 @@ static void pnv_npu2_release_context(struct kref *kref) struct npu_context *npu_context = container_of(kref, struct npu_context, kref); + if (!npu_context->nmmu_flush) + mm_context_remove_copro(npu_context->mm); + npu_context->mm->context.npu_context = NULL; mmu_notifier_unregister(&npu_context->mn, npu_context->mm); @@ -819,6 +835,8 @@ int pnv_npu2_init(struct pnv_phb *phb) static int npu_index; uint64_t rc = 0; + phb->npu.nmmu_flush = + of_property_read_bool(phb->hose->dn, "ibm,nmmu-flush"); for_each_child_of_node(phb->hose->dn, dn) { gpdev = pnv_pci_get_gpu_dev(get_pci_dev(dn)); if (gpdev) { diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h index 56d1f272d4ad..96151b3a2dd4 100644 --- a/arch/powerpc/platforms/powernv/pci.h +++ b/arch/powerpc/platforms/powernv/pci.h @@ -187,6 +187,9 @@ struct pnv_phb { /* Bitmask for MMIO register usage */ unsigned long mmio_atsd_usage; + + /* Do we need to explicitly flush the nest mmu? */ + bool nmmu_flush; } npu; #ifdef CONFIG_CXL_BASE |