[PATCH 10/19] dmaengine: expose per channel dma mapping characteristics to clients

Dan Williams
2006-09-11T23:18:43Z

From: Dan Williams <dan.j.williams@intel.com>

Allow a client to ensure that the dma channel it has selected can
dma to the specified buffer or page address. Also allow the client to
pre-map address ranges to be passed to the operations API.

Changelog:
* make the dmaengine api EXPORT_SYMBOL_GPL
* zero sum support should be standalone, not integrated into xor

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---

drivers/dma/dmaengine.c | 4 ++++
drivers/dma/ioatdma.c | 35 +++++++++++++++++++++++++++++++++++
include/linux/dmaengine.h | 34 ++++++++++++++++++++++++++++++++++
3 files changed, 73 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 9b02afa..e78ce89 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -630,3 +630,7 @@ EXPORT_SYMBOL_GPL(dma_async_device_unreg
EXPORT_SYMBOL_GPL(dma_chan_cleanup);
EXPORT_SYMBOL_GPL(dma_async_do_xor_err);
EXPORT_SYMBOL_GPL(dma_async_chan_init);
+EXPORT_SYMBOL_GPL(dma_async_map_page);
+EXPORT_SYMBOL_GPL(dma_async_map_single);
+EXPORT_SYMBOL_GPL(dma_async_unmap_page);
+EXPORT_SYMBOL_GPL(dma_async_unmap_single);
diff --git a/drivers/dma/ioatdma.c b/drivers/dma/ioatdma.c
index dd5b9f0..0159d14 100644
--- a/drivers/dma/ioatdma.c
+++ b/drivers/dma/ioatdma.c
@@ -637,6 +637,37 @@ extern dma_cookie_t dma_async_do_xor_err
union dmaengine_addr src, unsigned int src_cnt,
unsigned int src_off, size_t len, unsigned long flags);

+static dma_addr_t ioat_map_page(struct dma_chan *chan, struct page *page,
+ unsigned long offset, size_t size,
+ int direction)
+{
+ struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
+ return pci_map_page(ioat_chan->device->pdev, page, offset, size,
+ direction);
+}
+
+static dma_addr_t ioat_map_single(struct dma_chan *chan, void *cpu_addr,
+ size_t size, int direction)
+{
+ struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
+ return pci_map_single(ioat_chan->device->pdev, cpu_addr, size,
+ direction);
+}
+
+static void ioat_unmap_page(struct dma_chan *chan, dma_addr_t handle,
+ size_t size, int direction)
+{
+ struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
+ pci_unmap_page(ioat_chan->device->pdev, handle, size, direction);
+}
+
+static void ioat_unmap_single(struct dma_chan *chan, dma_addr_t handle,
+ size_t size, int direction)
+{
+ struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
+ pci_unmap_single(ioat_chan->device->pdev, handle, size, direction);
+}
+
static int __devinit ioat_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
@@ -717,6 +748,10 @@ #endif
device->common.capabilities = DMA_MEMCPY;
device->common.device_do_dma_memcpy = do_ioat_dma_memcpy;
device->common.device_do_dma_xor = dma_async_do_xor_err;
+ device->common.map_page = ioat_map_page;
+ device->common.map_single = ioat_map_single;
+ device->common.unmap_page = ioat_unmap_page;
+ device->common.unmap_single = ioat_unmap_single;
printk(KERN_INFO "Intel(R) I/OAT DMA Engine found, %d channels\n",
device->common.chancnt);

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index df055cc..cb4cfcf 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -287,6 +287,15 @@ struct dma_device {
enum dma_status (*device_operation_complete)(struct dma_chan *chan,
dma_cookie_t cookie, dma_cookie_t *last,
dma_cookie_t *used);
+ dma_addr_t (*map_page)(struct dma_chan *chan, struct page *page,
+ unsigned long offset, size_t size,
+ int direction);
+ dma_addr_t (*map_single)(struct dma_chan *chan, void *cpu_addr,
+ size_t size, int direction);
+ void (*unmap_page)(struct dma_chan *chan, dma_addr_t handle,
+ size_t size, int direction);
+ void (*unmap_single)(struct dma_chan *chan, dma_addr_t handle,
+ size_t size, int direction);
void (*device_issue_pending)(struct dma_chan *chan);
};

@@ -592,6 +601,31 @@ static inline enum dma_status dma_async_
return DMA_IN_PROGRESS;
}

+static inline dma_addr_t dma_async_map_page(struct dma_chan *chan,
+ struct page *page, unsigned long offset, size_t size,
+ int direction)
+{
+ return chan->device->map_page(chan, page, offset, size, direction);
+}
+
+static inline dma_addr_t dma_async_map_single(struct dma_chan *chan,
+ void *cpu_addr, size_t size, int direction)
+{
+ return chan->device->map_single(chan, cpu_addr, size, direction);
+}
+
+static inline void dma_async_unmap_page(struct dma_chan *chan,
+ dma_addr_t handle, size_t size, int direction)
+{
+ chan->device->unmap_page(chan, handle, size, direction);
+}
+
+static inline void dma_async_unmap_single(struct dma_chan *chan,
+ dma_addr_t handle, size_t size, int direction)
+{
+ chan->device->unmap_single(chan, handle, size, direction);
+}
+
/* --- DMA device --- */

int dma_async_device_register(struct dma_device *device);