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Date: Tue, 11 May 2010 15:39:19 -0400
From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To: Albert Herranz <albert_herranz@...oo.es>
Cc: Ian.Campbell@...citrix.com, jeremy@...p.org,
linux-kernel@...r.kernel.org, chrisw@...s-sol.org,
iommu@...ts.linux-foundation.org, dwmw2@...radead.org,
fujita.tomonori@....ntt.co.jp
Subject: Re: [PATCH 5/6] swiotlb: Make swiotlb bookkeeping functions visible
in the header file.
On Tue, May 11, 2010 at 09:01:29PM +0200, Albert Herranz wrote:
> Konrad Rzeszutek Wilk wrote:
> >>> +extern void *swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
> >>> + u64 tbl_dma_addr, size_t size,
> >>> + enum dma_data_direction dir);
> >>> +
> >> The phys and tbl_dma_addr arguments in the function prototype are swapped compared to the function definition in patch 1/6.
> >
> > Duh! Thanks for spotting that. Here is a repost of this patch (I've
> > updated the git tree with the one below):
> >
>
> Thanks. That was fast :)
>
> One more thing. Shouldn't be more appropriate to make tbl_dma_addr a dma_addr_t instead of a u64?
> For example, in my case I'm currently using the swiotlb code to overcome some DMA limitations in a 32-bit PowerPC platform.
> In this scenario the dma_addr_t type is defined either as a u64 for 64-bit PowerPC or as a u32 for 32-bit PowerPC.
Good point.
So these two patches (one to replace the PATCH 1/6 and the other to
replace this one), would work then:
I've put the whole tree at:
git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb-2.6.git swiotlb-0.8.1
>From 17ef8495231cef0529a2d9763bc7ce73e8860da2 Mon Sep 17 00:00:00 2001
From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Date: Mon, 10 May 2010 15:14:54 -0400
Subject: [PATCH 1/6] swiotlb: add swiotlb_tbl_map_single library function
swiotlb_tbl_map_single() takes the dma address of iotlb instead of
using swiotlb_virt_to_bus().
[v2: changed swiotlb_tlb to swiotlb_tbl]
[v3: changed u64 to dma_addr_t]
Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
---
lib/swiotlb.c | 25 +++++++++++++++++--------
1 files changed, 17 insertions(+), 8 deletions(-)
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 5fddf72..78320d7 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -361,25 +361,22 @@ static void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
}
}
-/*
- * Allocates bounce buffer and returns its kernel virtual address.
- */
-static void *
-map_single(struct device *hwdev, phys_addr_t phys, size_t size, int dir)
+void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr,
+ phys_addr_t phys, size_t size, int dir)
{
unsigned long flags;
char *dma_addr;
unsigned int nslots, stride, index, wrap;
int i;
- unsigned long start_dma_addr;
unsigned long mask;
unsigned long offset_slots;
unsigned long max_slots;
mask = dma_get_seg_boundary(hwdev);
- start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start) & mask;
- offset_slots = ALIGN(start_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
+ tbl_dma_addr &= mask;
+
+ offset_slots = ALIGN(tbl_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
/*
* Carefully handle integer overflow which can occur when mask == ~0UL.
@@ -468,6 +465,18 @@ found:
}
/*
+ * Allocates bounce buffer and returns its kernel virtual address.
+ */
+
+static void *
+map_single(struct device *hwdev, phys_addr_t phys, size_t size, int dir)
+{
+ dma_addr_t start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start);
+
+ return swiotlb_tbl_map_single(hwdev, start_dma_addr, phys, size, dir);
+}
+
+/*
* dma_addr is the kernel virtual address of the bounce buffer to unmap.
*/
static void
--
1.6.2.5
and:
>From baddb085f29785b3029ec83244b2eda7d23a9d3b Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Date: Mon, 10 May 2010 16:20:57 -0400
Subject: [PATCH 5/6] swiotlb: Make swiotlb bookkeeping functions visible in the header file.
We put the functions dealing with the operations on
the SWIOTLB buffer in the header and make those functions non-static.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
---
include/linux/swiotlb.h | 22 ++++++++++++++++++++++
lib/swiotlb.c | 28 ++++++++++++----------------
2 files changed, 34 insertions(+), 16 deletions(-)
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index f3fc331..c40bb2a 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -25,6 +25,28 @@ extern int swiotlb_force;
extern void swiotlb_init(int verbose);
extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
+/*
+ * Enumeration for sync targets
+ */
+enum dma_sync_target {
+ SYNC_FOR_CPU = 0,
+ SYNC_FOR_DEVICE = 1,
+};
+extern void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr,
+ phys_addr_t phys, size_t size,
+ enum dma_data_direction dir);
+
+extern void swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr,
+ size_t size, enum dma_data_direction dir);
+
+extern void swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr,
+ size_t size, enum dma_data_direction dir,
+ enum dma_sync_target target);
+
+/* Accessory functions. */
+extern void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
+ enum dma_data_direction dir);
+
extern void
*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
dma_addr_t *dma_handle, gfp_t flags);
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 7eed4c9..7b4a41a 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -50,14 +50,6 @@
*/
#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
-/*
- * Enumeration for sync targets
- */
-enum dma_sync_target {
- SYNC_FOR_CPU = 0,
- SYNC_FOR_DEVICE = 1,
-};
-
int swiotlb_force;
/*
@@ -335,8 +327,8 @@ static int is_swiotlb_buffer(phys_addr_t paddr)
/*
* Bounce: copy the swiotlb buffer back to the original dma location
*/
-static void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
- enum dma_data_direction dir)
+void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
+ enum dma_data_direction dir)
{
unsigned long pfn = PFN_DOWN(phys);
@@ -493,7 +485,7 @@ map_single(struct device *hwdev, phys_addr_t phys, size_t size,
/*
* dma_addr is the kernel virtual address of the bounce buffer to unmap.
*/
-static void
+void
swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr, size_t size,
enum dma_data_direction dir)
{
@@ -534,9 +526,10 @@ swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr, size_t size,
spin_unlock_irqrestore(&io_tlb_lock, flags);
}
-static void
+void
swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr, size_t size,
- enum dma_data_direction dir, int target)
+ enum dma_data_direction dir,
+ enum dma_sync_target target)
{
int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
phys_addr_t phys = io_tlb_orig_addr[index];
@@ -748,7 +741,8 @@ EXPORT_SYMBOL_GPL(swiotlb_unmap_page);
*/
static void
swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
- size_t size, enum dma_data_direction dir, int target)
+ size_t size, enum dma_data_direction dir,
+ enum dma_sync_target target)
{
phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
@@ -788,7 +782,8 @@ EXPORT_SYMBOL(swiotlb_sync_single_for_device);
static void
swiotlb_sync_single_range(struct device *hwdev, dma_addr_t dev_addr,
unsigned long offset, size_t size,
- enum dma_data_direction dir, int target)
+ enum dma_data_direction dir,
+ enum dma_sync_target target)
{
swiotlb_sync_single(hwdev, dev_addr + offset, size, dir, target);
}
@@ -908,7 +903,8 @@ EXPORT_SYMBOL(swiotlb_unmap_sg);
*/
static void
swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
- int nelems, enum dma_data_direction dir, int target)
+ int nelems, enum dma_data_direction dir,
+ enum dma_sync_target target)
{
struct scatterlist *sg;
int i;
--
1.6.2.5
>
> Cheers,
> Albert
>
> _______________________________________________
> iommu mailing list
> iommu@...ts.linux-foundation.org
> https://lists.linux-foundation.org/mailman/listinfo/iommu
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