Re: [PATCH kernel v11 26/34] powerpc/powernv/ioda2: Introduce pnv_pci_ioda2_set_window

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 06/02/2015 09:30 AM, David Gibson wrote:
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()?


Yes, my bad... And the patch is not adding it at all...



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@xxxxxxxxx>
Reviewed-by: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
---
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);



--
Alexey
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux