Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
powerpc/dma: Fix dma_iommu_dma_supported compare
The table offset is in entries, each of which imply a dma address of
an IOMMU page.
Also, we should check the device can reach the whole IOMMU table.
Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
authored by Nishanth Aravamudan and committed by Benjamin Herrenschmidt 1cb8e85a dda804ad
+11
-10
arch/powerpc/kernel/dma-iommu.c
+11
-10
arch/powerpc/kernel/dma-iommu.c
···
74
{
75
struct iommu_table *tbl = get_iommu_table_base(dev);
76
77
-
if (!tbl || tbl->it_offset > mask) {
78
-
printk(KERN_INFO
79
-
"Warning: IOMMU offset too big for device mask\n");
80
-
if (tbl)
81
-
printk(KERN_INFO
82
-
"mask: 0x%08llx, table offset: 0x%08lx\n",
83
-
mask, tbl->it_offset);
84
-
else
85
-
printk(KERN_INFO "mask: 0x%08llx, table unavailable\n",
86
-
mask);
87
return 0;
88
} else
89
return 1;
···
74
{
75
struct iommu_table *tbl = get_iommu_table_base(dev);
76
77
+
if (!tbl) {
78
+
dev_info(dev, "Warning: IOMMU dma not supported: mask 0x%08llx"
79
+
", table unavailable\n", mask);
80
+
return 0;
81
+
}
82
+
83
+
if ((tbl->it_offset + tbl->it_size) > (mask >> IOMMU_PAGE_SHIFT)) {
84
+
dev_info(dev, "Warning: IOMMU window too big for device mask\n");
85
+
dev_info(dev, "mask: 0x%08llx, table end: 0x%08lx\n",
86
+
mask, (tbl->it_offset + tbl->it_size) <<
87
+
IOMMU_PAGE_SHIFT);
88
return 0;
89
} else
90
return 1;