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Diffstat (limited to 'arch/powerpc/platforms/pseries/iommu.c')
-rw-r--r--arch/powerpc/platforms/pseries/iommu.c156
1 files changed, 105 insertions, 51 deletions
diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index 496e16c588..e8c4129697 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -574,29 +574,6 @@ static void iommu_table_setparms(struct pci_controller *phb,
struct iommu_table_ops iommu_table_lpar_multi_ops;
-/*
- * iommu_table_setparms_lpar
- *
- * Function: On pSeries LPAR systems, return TCE table info, given a pci bus.
- */
-static void iommu_table_setparms_lpar(struct pci_controller *phb,
- struct device_node *dn,
- struct iommu_table *tbl,
- struct iommu_table_group *table_group,
- const __be32 *dma_window)
-{
- unsigned long offset, size, liobn;
-
- of_parse_dma_window(dn, dma_window, &liobn, &offset, &size);
-
- iommu_table_setparms_common(tbl, phb->bus->number, liobn, offset, size, IOMMU_PAGE_SHIFT_4K, NULL,
- &iommu_table_lpar_multi_ops);
-
-
- table_group->tce32_start = offset;
- table_group->tce32_size = size;
-}
-
struct iommu_table_ops iommu_table_pseries_ops = {
.set = tce_build_pSeries,
.clear = tce_free_pSeries,
@@ -724,26 +701,71 @@ struct iommu_table_ops iommu_table_lpar_multi_ops = {
* dynamic 64bit DMA window, walking up the device tree.
*/
static struct device_node *pci_dma_find(struct device_node *dn,
- const __be32 **dma_window)
+ struct dynamic_dma_window_prop *prop)
{
- const __be32 *dw = NULL;
+ const __be32 *default_prop = NULL;
+ const __be32 *ddw_prop = NULL;
+ struct device_node *rdn = NULL;
+ bool default_win = false, ddw_win = false;
for ( ; dn && PCI_DN(dn); dn = dn->parent) {
- dw = of_get_property(dn, "ibm,dma-window", NULL);
- if (dw) {
- if (dma_window)
- *dma_window = dw;
- return dn;
+ default_prop = of_get_property(dn, "ibm,dma-window", NULL);
+ if (default_prop) {
+ rdn = dn;
+ default_win = true;
+ }
+ ddw_prop = of_get_property(dn, DIRECT64_PROPNAME, NULL);
+ if (ddw_prop) {
+ rdn = dn;
+ ddw_win = true;
+ break;
+ }
+ ddw_prop = of_get_property(dn, DMA64_PROPNAME, NULL);
+ if (ddw_prop) {
+ rdn = dn;
+ ddw_win = true;
+ break;
}
- dw = of_get_property(dn, DIRECT64_PROPNAME, NULL);
- if (dw)
- return dn;
- dw = of_get_property(dn, DMA64_PROPNAME, NULL);
- if (dw)
- return dn;
+
+ /* At least found default window, which is the case for normal boot */
+ if (default_win)
+ break;
}
- return NULL;
+ /* For PCI devices there will always be a DMA window, either on the device
+ * or parent bus
+ */
+ WARN_ON(!(default_win | ddw_win));
+
+ /* caller doesn't want to get DMA window property */
+ if (!prop)
+ return rdn;
+
+ /* parse DMA window property. During normal system boot, only default
+ * DMA window is passed in OF. But, for kdump, a dedicated adapter might
+ * have both default and DDW in FDT. In this scenario, DDW takes precedence
+ * over default window.
+ */
+ if (ddw_win) {
+ struct dynamic_dma_window_prop *p;
+
+ p = (struct dynamic_dma_window_prop *)ddw_prop;
+ prop->liobn = p->liobn;
+ prop->dma_base = p->dma_base;
+ prop->tce_shift = p->tce_shift;
+ prop->window_shift = p->window_shift;
+ } else if (default_win) {
+ unsigned long offset, size, liobn;
+
+ of_parse_dma_window(rdn, default_prop, &liobn, &offset, &size);
+
+ prop->liobn = cpu_to_be32((u32)liobn);
+ prop->dma_base = cpu_to_be64(offset);
+ prop->tce_shift = cpu_to_be32(IOMMU_PAGE_SHIFT_4K);
+ prop->window_shift = cpu_to_be32(order_base_2(size));
+ }
+
+ return rdn;
}
static void pci_dma_bus_setup_pSeriesLP(struct pci_bus *bus)
@@ -751,17 +773,20 @@ static void pci_dma_bus_setup_pSeriesLP(struct pci_bus *bus)
struct iommu_table *tbl;
struct device_node *dn, *pdn;
struct pci_dn *ppci;
- const __be32 *dma_window = NULL;
+ struct dynamic_dma_window_prop prop;
dn = pci_bus_to_OF_node(bus);
pr_debug("pci_dma_bus_setup_pSeriesLP: setting up bus %pOF\n",
dn);
- pdn = pci_dma_find(dn, &dma_window);
+ pdn = pci_dma_find(dn, &prop);
- if (dma_window == NULL)
- pr_debug(" no ibm,dma-window property !\n");
+ /* In PPC architecture, there will always be DMA window on bus or one of the
+ * parent bus. During reboot, there will be ibm,dma-window property to
+ * define DMA window. For kdump, there will at least be default window or DDW
+ * or both.
+ */
ppci = PCI_DN(pdn);
@@ -771,13 +796,24 @@ static void pci_dma_bus_setup_pSeriesLP(struct pci_bus *bus)
if (!ppci->table_group) {
ppci->table_group = iommu_pseries_alloc_group(ppci->phb->node);
tbl = ppci->table_group->tables[0];
- if (dma_window) {
- iommu_table_setparms_lpar(ppci->phb, pdn, tbl,
- ppci->table_group, dma_window);
- if (!iommu_init_table(tbl, ppci->phb->node, 0, 0))
- panic("Failed to initialize iommu table");
- }
+ iommu_table_setparms_common(tbl, ppci->phb->bus->number,
+ be32_to_cpu(prop.liobn),
+ be64_to_cpu(prop.dma_base),
+ 1ULL << be32_to_cpu(prop.window_shift),
+ be32_to_cpu(prop.tce_shift), NULL,
+ &iommu_table_lpar_multi_ops);
+
+ /* Only for normal boot with default window. Doesn't matter even
+ * if we set these with DDW which is 64bit during kdump, since
+ * these will not be used during kdump.
+ */
+ ppci->table_group->tce32_start = be64_to_cpu(prop.dma_base);
+ ppci->table_group->tce32_size = 1 << be32_to_cpu(prop.window_shift);
+
+ if (!iommu_init_table(tbl, ppci->phb->node, 0, 0))
+ panic("Failed to initialize iommu table");
+
iommu_register_group(ppci->table_group,
pci_domain_nr(bus), 0);
pr_debug(" created table: %p\n", ppci->table_group);
@@ -968,6 +1004,12 @@ static void find_existing_ddw_windows_named(const char *name)
continue;
}
+ /* If at the time of system initialization, there are DDWs in OF,
+ * it means this is during kexec. DDW could be direct or dynamic.
+ * We will just mark DDWs as "dynamic" since this is kdump path,
+ * no need to worry about perforance. ddw_list_new_entry() will
+ * set window->direct = false.
+ */
window = ddw_list_new_entry(pdn, dma64);
if (!window) {
of_node_put(pdn);
@@ -1524,8 +1566,8 @@ static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev)
{
struct device_node *pdn, *dn;
struct iommu_table *tbl;
- const __be32 *dma_window = NULL;
struct pci_dn *pci;
+ struct dynamic_dma_window_prop prop;
pr_debug("pci_dma_dev_setup_pSeriesLP: %s\n", pci_name(dev));
@@ -1538,7 +1580,7 @@ static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev)
dn = pci_device_to_OF_node(dev);
pr_debug(" node is %pOF\n", dn);
- pdn = pci_dma_find(dn, &dma_window);
+ pdn = pci_dma_find(dn, &prop);
if (!pdn || !PCI_DN(pdn)) {
printk(KERN_WARNING "pci_dma_dev_setup_pSeriesLP: "
"no DMA window found for pci dev=%s dn=%pOF\n",
@@ -1551,8 +1593,20 @@ static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev)
if (!pci->table_group) {
pci->table_group = iommu_pseries_alloc_group(pci->phb->node);
tbl = pci->table_group->tables[0];
- iommu_table_setparms_lpar(pci->phb, pdn, tbl,
- pci->table_group, dma_window);
+
+ iommu_table_setparms_common(tbl, pci->phb->bus->number,
+ be32_to_cpu(prop.liobn),
+ be64_to_cpu(prop.dma_base),
+ 1ULL << be32_to_cpu(prop.window_shift),
+ be32_to_cpu(prop.tce_shift), NULL,
+ &iommu_table_lpar_multi_ops);
+
+ /* Only for normal boot with default window. Doesn't matter even
+ * if we set these with DDW which is 64bit during kdump, since
+ * these will not be used during kdump.
+ */
+ pci->table_group->tce32_start = be64_to_cpu(prop.dma_base);
+ pci->table_group->tce32_size = 1 << be32_to_cpu(prop.window_shift);
iommu_init_table(tbl, pci->phb->node, 0, 0);
iommu_register_group(pci->table_group,