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path: root/drivers/xen/swiotlb-xen.c
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Diffstat (limited to 'drivers/xen/swiotlb-xen.c')
-rw-r--r--drivers/xen/swiotlb-xen.c119
1 files changed, 76 insertions, 43 deletions
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 4d519488d30..58db6df866e 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -52,7 +52,7 @@ static unsigned long xen_io_tlb_nslabs;
* Quick lookup value of the bus address of the IOTLB.
*/
-u64 start_dma_addr;
+static u64 start_dma_addr;
static dma_addr_t xen_phys_to_bus(phys_addr_t paddr)
{
@@ -144,31 +144,72 @@ xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslabs)
} while (i < nslabs);
return 0;
}
+static unsigned long xen_set_nslabs(unsigned long nr_tbl)
+{
+ if (!nr_tbl) {
+ xen_io_tlb_nslabs = (64 * 1024 * 1024 >> IO_TLB_SHIFT);
+ xen_io_tlb_nslabs = ALIGN(xen_io_tlb_nslabs, IO_TLB_SEGSIZE);
+ } else
+ xen_io_tlb_nslabs = nr_tbl;
-void __init xen_swiotlb_init(int verbose)
+ return xen_io_tlb_nslabs << IO_TLB_SHIFT;
+}
+
+enum xen_swiotlb_err {
+ XEN_SWIOTLB_UNKNOWN = 0,
+ XEN_SWIOTLB_ENOMEM,
+ XEN_SWIOTLB_EFIXUP
+};
+
+static const char *xen_swiotlb_error(enum xen_swiotlb_err err)
+{
+ switch (err) {
+ case XEN_SWIOTLB_ENOMEM:
+ return "Cannot allocate Xen-SWIOTLB buffer\n";
+ case XEN_SWIOTLB_EFIXUP:
+ return "Failed to get contiguous memory for DMA from Xen!\n"\
+ "You either: don't have the permissions, do not have"\
+ " enough free memory under 4GB, or the hypervisor memory"\
+ " is too fragmented!";
+ default:
+ break;
+ }
+ return "";
+}
+int __ref xen_swiotlb_init(int verbose, bool early)
{
- unsigned long bytes;
+ unsigned long bytes, order;
int rc = -ENOMEM;
- unsigned long nr_tbl;
- char *m = NULL;
+ enum xen_swiotlb_err m_ret = XEN_SWIOTLB_UNKNOWN;
unsigned int repeat = 3;
- nr_tbl = swiotlb_nr_tbl();
- if (nr_tbl)
- xen_io_tlb_nslabs = nr_tbl;
- else {
- xen_io_tlb_nslabs = (64 * 1024 * 1024 >> IO_TLB_SHIFT);
- xen_io_tlb_nslabs = ALIGN(xen_io_tlb_nslabs, IO_TLB_SEGSIZE);
- }
+ xen_io_tlb_nslabs = swiotlb_nr_tbl();
retry:
- bytes = xen_io_tlb_nslabs << IO_TLB_SHIFT;
-
+ bytes = xen_set_nslabs(xen_io_tlb_nslabs);
+ order = get_order(xen_io_tlb_nslabs << IO_TLB_SHIFT);
/*
* Get IO TLB memory from any location.
*/
- xen_io_tlb_start = alloc_bootmem_pages(PAGE_ALIGN(bytes));
+ if (early)
+ xen_io_tlb_start = alloc_bootmem_pages(PAGE_ALIGN(bytes));
+ else {
+#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
+#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
+ while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
+ xen_io_tlb_start = (void *)__get_free_pages(__GFP_NOWARN, order);
+ if (xen_io_tlb_start)
+ break;
+ order--;
+ }
+ if (order != get_order(bytes)) {
+ pr_warn("Warning: only able to allocate %ld MB "
+ "for software IO TLB\n", (PAGE_SIZE << order) >> 20);
+ xen_io_tlb_nslabs = SLABS_PER_PAGE << order;
+ bytes = xen_io_tlb_nslabs << IO_TLB_SHIFT;
+ }
+ }
if (!xen_io_tlb_start) {
- m = "Cannot allocate Xen-SWIOTLB buffer!\n";
+ m_ret = XEN_SWIOTLB_ENOMEM;
goto error;
}
xen_io_tlb_end = xen_io_tlb_start + bytes;
@@ -179,17 +220,22 @@ retry:
bytes,
xen_io_tlb_nslabs);
if (rc) {
- free_bootmem(__pa(xen_io_tlb_start), PAGE_ALIGN(bytes));
- m = "Failed to get contiguous memory for DMA from Xen!\n"\
- "You either: don't have the permissions, do not have"\
- " enough free memory under 4GB, or the hypervisor memory"\
- "is too fragmented!";
+ if (early)
+ free_bootmem(__pa(xen_io_tlb_start), PAGE_ALIGN(bytes));
+ else {
+ free_pages((unsigned long)xen_io_tlb_start, order);
+ xen_io_tlb_start = NULL;
+ }
+ m_ret = XEN_SWIOTLB_EFIXUP;
goto error;
}
start_dma_addr = xen_virt_to_bus(xen_io_tlb_start);
- swiotlb_init_with_tbl(xen_io_tlb_start, xen_io_tlb_nslabs, verbose);
-
- return;
+ if (early) {
+ swiotlb_init_with_tbl(xen_io_tlb_start, xen_io_tlb_nslabs, verbose);
+ rc = 0;
+ } else
+ rc = swiotlb_late_init_with_tbl(xen_io_tlb_start, xen_io_tlb_nslabs);
+ return rc;
error:
if (repeat--) {
xen_io_tlb_nslabs = max(1024UL, /* Min is 2MB */
@@ -198,10 +244,13 @@ error:
(xen_io_tlb_nslabs << IO_TLB_SHIFT) >> 20);
goto retry;
}
- xen_raw_printk("%s (rc:%d)", m, rc);
- panic("%s (rc:%d)", m, rc);
+ pr_err("%s (rc:%d)", xen_swiotlb_error(m_ret), rc);
+ if (early)
+ panic("%s (rc:%d)", xen_swiotlb_error(m_ret), rc);
+ else
+ free_pages((unsigned long)xen_io_tlb_start, order);
+ return rc;
}
-
void *
xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
dma_addr_t *dma_handle, gfp_t flags,
@@ -466,14 +515,6 @@ xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
}
EXPORT_SYMBOL_GPL(xen_swiotlb_map_sg_attrs);
-int
-xen_swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
- enum dma_data_direction dir)
-{
- return xen_swiotlb_map_sg_attrs(hwdev, sgl, nelems, dir, NULL);
-}
-EXPORT_SYMBOL_GPL(xen_swiotlb_map_sg);
-
/*
* Unmap a set of streaming mode DMA translations. Again, cpu read rules
* concerning calls here are the same as for swiotlb_unmap_page() above.
@@ -494,14 +535,6 @@ xen_swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
}
EXPORT_SYMBOL_GPL(xen_swiotlb_unmap_sg_attrs);
-void
-xen_swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
- enum dma_data_direction dir)
-{
- return xen_swiotlb_unmap_sg_attrs(hwdev, sgl, nelems, dir, NULL);
-}
-EXPORT_SYMBOL_GPL(xen_swiotlb_unmap_sg);
-
/*
* Make physical memory consistent for a set of streaming mode DMA translations
* after a transfer.