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Subject[PATCH 2/5] swiotlb: add the swiotlb initialization function with iotlb memory
Date
From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

This enables the caller to initialize swiotlb with its own iotlb
memory.

[v2: changed ..with_tlb to ..with_tbl]

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Albert Herranz <albert_herranz@yahoo.es>
---
include/linux/swiotlb.h | 1 +
lib/swiotlb.c | 48 +++++++++++++++++++++++++++++-----------------
2 files changed, 31 insertions(+), 18 deletions(-)
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 81a4e21..b406261 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -23,6 +23,7 @@ extern int swiotlb_force;
#define IO_TLB_SHIFT 11

extern void swiotlb_init(int verbose);
+extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);

extern void
*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 783aff0..ec61e15 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -140,28 +140,14 @@ void swiotlb_print_info(void)
(unsigned long long)pend);
}

-/*
- * Statically reserve bounce buffer space and initialize bounce buffer data
- * structures for the software IO TLB used to implement the DMA API.
- */
-void __init
-swiotlb_init_with_default_size(size_t default_size, int verbose)
+void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
{
unsigned long i, bytes;

- if (!io_tlb_nslabs) {
- io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
- io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
- }
+ bytes = nslabs << IO_TLB_SHIFT;

- bytes = io_tlb_nslabs << IO_TLB_SHIFT;
-
- /*
- * Get IO TLB memory from the low pages
- */
- io_tlb_start = alloc_bootmem_low_pages(bytes);
- if (!io_tlb_start)
- panic("Cannot allocate SWIOTLB buffer");
+ io_tlb_nslabs = nslabs;
+ io_tlb_start = tlb;
io_tlb_end = io_tlb_start + bytes;

/*
@@ -185,6 +171,32 @@ swiotlb_init_with_default_size(size_t default_size, int verbose)
swiotlb_print_info();
}

+/*
+ * Statically reserve bounce buffer space and initialize bounce buffer data
+ * structures for the software IO TLB used to implement the DMA API.
+ */
+void __init
+swiotlb_init_with_default_size(size_t default_size, int verbose)
+{
+ unsigned long bytes;
+
+ if (!io_tlb_nslabs) {
+ io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
+ io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
+ }
+
+ bytes = io_tlb_nslabs << IO_TLB_SHIFT;
+
+ /*
+ * Get IO TLB memory from the low pages
+ */
+ io_tlb_start = alloc_bootmem_low_pages(bytes);
+ if (!io_tlb_start)
+ panic("Cannot allocate SWIOTLB buffer");
+
+ swiotlb_init_with_tbl(io_tlb_start, io_tlb_nslabs, verbose);
+}
+
void __init
swiotlb_init(int verbose)
{
--
1.6.2.5


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