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Date: Mon, 1 Jun 2009 16:33:03 +0100
From: Ian Campbell <ian.campbell@...rix.com>
To: <linux-kernel@...r.kernel.org>
CC: Ian Campbell <ian.campbell@...rix.com>,
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
Jeremy Fitzhardinge <jeremy@...p.org>,
Olaf Kirch <okir@...e.de>, Greg KH <gregkh@...e.de>,
Ingo Molnar <mingo@...e.hu>
Subject: [PATCH 11/11] swiotlb: allow initialisation with pre-allocated bounce-buffer
This allows the generic swiotlb code to be used by users with unusual
requirements for the buffer allocation by allowing them to provide
their own swiotlb buffer.
Also:
- swiotlb_init_with_default_size is unused so collapse into
swiotlb_init.
- move declarations of swiotlb_late_init_with_default_size out of *.c
into linux/swiotlb.h where they belong
- Make io_tlb_nslabs and io_tlb_overflow non-static since callers of the
new interface will want to access them.
Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
Cc: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc: Jeremy Fitzhardinge <jeremy@...p.org>
Cc: Olaf Kirch <okir@...e.de>
Cc: Greg KH <gregkh@...e.de>
Cc: Ingo Molnar <mingo@...e.hu>
---
arch/ia64/hp/common/hwsw_iommu.c | 3 --
arch/ia64/hp/common/sba_iommu.c | 2 -
include/linux/swiotlb.h | 14 ++++++++
lib/swiotlb.c | 64 +++++++++++++++++++++----------------
4 files changed, 50 insertions(+), 33 deletions(-)
diff --git a/arch/ia64/hp/common/hwsw_iommu.c b/arch/ia64/hp/common/hwsw_iommu.c
index e4a80d8..d557779 100644
--- a/arch/ia64/hp/common/hwsw_iommu.c
+++ b/arch/ia64/hp/common/hwsw_iommu.c
@@ -19,9 +19,6 @@
extern struct dma_map_ops sba_dma_ops, swiotlb_dma_ops;
-/* swiotlb declarations & definitions: */
-extern int swiotlb_late_init_with_default_size (size_t size);
-
/*
* Note: we need to make the determination of whether or not to use
* the sw I/O TLB based purely on the device structure. Anything else
diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index 56ceb68..eeb5b49 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -46,8 +46,6 @@
#include <asm/acpi-ext.h>
-extern int swiotlb_late_init_with_default_size (size_t size);
-
#define PFX "IOC: "
/*
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index b5b2245..7c6f4c1 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -21,8 +21,22 @@ struct scatterlist;
*/
#define IO_TLB_SHIFT 11
+/*
+ * number of IO TLB slabs.
+ */
+extern unsigned long io_tlb_nslabs;
+
+/*
+ * size of emergency overflow buffer.
+ */
+extern unsigned long io_tlb_overflow;
+
extern void
swiotlb_init(void);
+extern void
+swiotlb_init_with_buffer(unsigned long bytes, void *buffer, void *emergency);
+extern int
+swiotlb_late_init_with_default_size(size_t size);
extern void
*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 6076bb7..2449669 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -70,14 +70,14 @@ static char *io_tlb_start, *io_tlb_end;
* The number of IO TLB blocks (in groups of 64) betweeen io_tlb_start and
* io_tlb_end. This is command line adjustable via setup_io_tlb_npages.
*/
-static unsigned long io_tlb_nslabs;
+unsigned long io_tlb_nslabs;
/*
* When the IOMMU overflows we return a fallback buffer. This sets the size.
*/
-static unsigned long io_tlb_overflow = 32*1024;
+unsigned long io_tlb_overflow = 32*1024;
-void *io_tlb_overflow_buffer;
+static void *io_tlb_overflow_buffer;
/*
* This is a free list describing the number of free entries available from
@@ -148,14 +148,40 @@ static void swiotlb_print_info(unsigned long bytes)
(unsigned long long)pend);
}
+void __init
+swiotlb_init_with_buffer(unsigned long bytes, void *buffer, void *overflow)
+{
+ unsigned long i;
+
+ io_tlb_start = buffer;
+ io_tlb_end = io_tlb_start + bytes;
+
+ io_tlb_overflow_buffer = overflow;
+
+ /*
+ * Allocate and initialize the free list array. This array is used
+ * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
+ * between io_tlb_start and io_tlb_end.
+ */
+ io_tlb_list = alloc_bootmem(io_tlb_nslabs * sizeof(int));
+ for (i = 0; i < io_tlb_nslabs; i++)
+ io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
+ io_tlb_index = 0;
+ io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(phys_addr_t));
+
+ swiotlb_print_info(bytes);
+}
+
/*
* 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)
+swiotlb_init(void)
{
- unsigned long i, bytes;
+ unsigned long bytes;
+ void *buffer, *overflow;
+ size_t default_size = 64 * (1<<20); /* default to 64MB */
if (!io_tlb_nslabs) {
io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
@@ -167,36 +193,18 @@ swiotlb_init_with_default_size(size_t default_size)
/*
* Get IO TLB memory from the low pages
*/
- io_tlb_start = alloc_bootmem_low_pages(bytes);
- if (!io_tlb_start)
+ buffer = alloc_bootmem_low_pages(bytes);
+ if (!buffer)
panic("Cannot allocate SWIOTLB buffer");
- io_tlb_end = io_tlb_start + bytes;
-
- /*
- * Allocate and initialize the free list array. This array is used
- * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
- * between io_tlb_start and io_tlb_end.
- */
- io_tlb_list = alloc_bootmem(io_tlb_nslabs * sizeof(int));
- for (i = 0; i < io_tlb_nslabs; i++)
- io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
- io_tlb_index = 0;
- io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(phys_addr_t));
/*
* Get the overflow emergency buffer
*/
- io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow);
- if (!io_tlb_overflow_buffer)
+ overflow = alloc_bootmem_low(io_tlb_overflow);
+ if (!overflow)
panic("Cannot allocate SWIOTLB overflow buffer!\n");
- swiotlb_print_info(bytes);
-}
-
-void __init
-swiotlb_init(void)
-{
- swiotlb_init_with_default_size(64 * (1<<20)); /* default to 64MB */
+ swiotlb_init_with_buffer(bytes, buffer, overflow);
}
/*
--
1.5.6.5
--
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