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powerpc fixes for 5.15 #6

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Three commits fixing some issues introduced with the recent IOMMU changes we merged.
 
 Thanks to: Alexey Kardashevskiy
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Merge tag 'powerpc-5.15-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "Three commits fixing some issues introduced with the recent IOMMU
  changes we merged.

  Thanks to Alexey Kardashevskiy"

* tag 'powerpc-5.15-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/pseries/iommu: Create huge DMA window if no MMIO32 is present
  powerpc/pseries/iommu: Check if the default window in use before removing it
  powerpc/pseries/iommu: Use correct vfree for it_map
This commit is contained in:
Linus Torvalds 2021-10-29 17:35:56 -07:00
commit 119c85055d
1 changed files with 14 additions and 13 deletions
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27
arch/powerpc/platforms/pseries/iommu.c
View file

@ -1302,6 +1302,12 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
struct property *default_win;
int reset_win_ext;
/* DDW + IOMMU on single window may fail if there is any allocation */
if (iommu_table_in_use(tbl)) {
dev_warn(&dev->dev, "current IOMMU table in use, can't be replaced.\n");
goto out_failed;
}
default_win = of_find_property(pdn, "ibm,dma-window", NULL);
if (!default_win)
goto out_failed;
@ -1356,12 +1362,6 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
query.largest_available_block,
1ULL << page_shift);
/* DDW + IOMMU on single window may fail if there is any allocation */
if (default_win_removed && iommu_table_in_use(tbl)) {
dev_dbg(&dev->dev, "current IOMMU table in use, can't be replaced.\n");
goto out_failed;
}
len = order_base_2(query.largest_available_block << page_shift);
win_name = DMA64_PROPNAME;
} else {
@ -1411,18 +1411,19 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
} else {
struct iommu_table *newtbl;
int i;
unsigned long start = 0, end = 0;
for (i = 0; i < ARRAY_SIZE(pci->phb->mem_resources); i++) {
const unsigned long mask = IORESOURCE_MEM_64 | IORESOURCE_MEM;
/* Look for MMIO32 */
if ((pci->phb->mem_resources[i].flags & mask) == IORESOURCE_MEM)
if ((pci->phb->mem_resources[i].flags & mask) == IORESOURCE_MEM) {
start = pci->phb->mem_resources[i].start;
end = pci->phb->mem_resources[i].end;
break;
}
}
if (i == ARRAY_SIZE(pci->phb->mem_resources))
goto out_del_list;
/* New table for using DDW instead of the default DMA window */
newtbl = iommu_pseries_alloc_table(pci->phb->node);
if (!newtbl) {
@ -1432,15 +1433,15 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
iommu_table_setparms_common(newtbl, pci->phb->bus->number, create.liobn, win_addr,
1UL << len, page_shift, NULL, &iommu_table_lpar_multi_ops);
iommu_init_table(newtbl, pci->phb->node, pci->phb->mem_resources[i].start,
pci->phb->mem_resources[i].end);
iommu_init_table(newtbl, pci->phb->node, start, end);
pci->table_group->tables[1] = newtbl;
/* Keep default DMA window stuct if removed */
if (default_win_removed) {
tbl->it_size = 0;
kfree(tbl->it_map);
vfree(tbl->it_map);
tbl->it_map = NULL;
}
set_iommu_table_base(&dev->dev, newtbl);