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SubjectRe: [PATCH kernel v11 26/34] powerpc/powernv/ioda2: Introduce pnv_pci_ioda2_set_window
On Fri, May 29, 2015 at 06:44:50PM +1000, Alexey Kardashevskiy wrote:
> This is a part of moving DMA window programming to an iommu_ops
> callback. pnv_pci_ioda2_set_window() takes an iommu_table_group as
> a first parameter (not pnv_ioda_pe) as it is going to be used as
> a callback for VFIO DDW code.
>
> This adds pnv_pci_ioda2_tvt_invalidate() to invalidate TVT as it is

I'm assuming that's what's now called pnv_pci_ioda2_invalidate_entire()?

> a good thing to do. It does not have immediate effect now as the table
> is never recreated after reboot but it will in the following patches.
>
> This should cause no behavioural change.
>
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
> Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
> ---
> Changes:
> v11:
> * replaced some 1<<it_page_shift with IOMMU_PAGE_SIZE() macro
>
> v9:
> * initialize pe->table_group.tables[0] at the very end when
> tbl is fully initialized
> * moved pnv_pci_ioda2_tvt_invalidate() from earlier patch
> ---
> arch/powerpc/platforms/powernv/pci-ioda.c | 47 +++++++++++++++++++++++++------
> 1 file changed, 38 insertions(+), 9 deletions(-)
>
> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
> index 3d29fe3..fda01c1 100644
> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
> @@ -1968,6 +1968,43 @@ static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
> }
> }
>
> +static long pnv_pci_ioda2_set_window(struct iommu_table_group *table_group,
> + int num, struct iommu_table *tbl)
> +{
> + struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe,
> + table_group);
> + struct pnv_phb *phb = pe->phb;
> + int64_t rc;
> + const __u64 start_addr = tbl->it_offset << tbl->it_page_shift;
> + const __u64 win_size = tbl->it_size << tbl->it_page_shift;
> +
> + pe_info(pe, "Setting up window %llx..%llx pg=%x\n",
> + start_addr, start_addr + win_size - 1,
> + IOMMU_PAGE_SIZE(tbl));
> +
> + /*
> + * 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(tbl->it_base),
> + tbl->it_size << 3,
> + IOMMU_PAGE_SIZE(tbl));
> + if (rc) {
> + pe_err(pe, "Failed to configure TCE table, err %ld\n", rc);
> + return rc;
> + }
> +
> + pnv_pci_link_table_and_group(phb->hose->node, num,
> + tbl, &pe->table_group);
> + pnv_pci_ioda2_tce_invalidate_entire(pe);
> +
> + return 0;
> +}
> +
> static void pnv_pci_ioda2_set_bypass(struct pnv_ioda_pe *pe, bool enable)
> {
> uint16_t window_id = (pe->pe_number << 1 ) + 1;
> @@ -2123,21 +2160,13 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
> pe->table_group.ops = &pnv_pci_ioda2_ops;
> #endif
>
> - /*
> - * 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(tbl->it_base),
> - tbl->it_size << 3, 1ULL << tbl->it_page_shift);
> + rc = pnv_pci_ioda2_set_window(&pe->table_group, 0, tbl);
> if (rc) {
> pe_err(pe, "Failed to configure 32-bit TCE table,"
> " err %ld\n", rc);
> goto fail;
> }
>
> - pnv_pci_ioda2_tce_invalidate_entire(pe);
> -
> /* OPAL variant of PHB3 invalidated TCEs */
> if (phb->ioda.tce_inval_reg)
> tbl->it_type |= (TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE);

--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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