A sample event engine for pcitool (not requiring any PCIe hardware). Initial (barely tested and intended only as an example) release

1 files changed, 46 insertions, 0 deletions

diff --git a/dma_private.h b/dma_private.h
new file mode 100644
index 0000000..53e951b
--- /dev/null
+++ b/dma_private.h
@@ -0,0 +1,46 @@
+#ifndef _PCIDEV_DMA_PRIVATE_H
+#define _PCIDEV_DMA_PRIVATE_H
+
+#include <pcilib/dma.h>
+
+#define PCIDEV_DMA_DESCRIPTOR_SIZE	128
+#define PCIDEV_DMA_DESCRIPTOR_ALIGNMENT	64
+
+#define PCIDEV_DMA_FLAG_NOSYNC		0x01		/**< Do not call kernel space for page synchronization */
+#define PCIDEV_DMA_FLAG_NOSLEEP		0x02		/**< Do not sleep in the loop while waiting for the data */
+#define PCIDEV_DMA_NODATA_SLEEP		100		/**< To keep CPU free, in nanoseconds */
+
+typedef uint32_t reg_t;
+typedef struct pcidev_dma_s pcidev_dma_t;
+typedef struct pcidev_dma_desc_s pcidev_dma_desc_t;
+
+struct pcidev_dma_desc_s {
+    uint32_t page_count;
+    volatile uintptr_t last_write_addr;
+    volatile uintptr_t last_read_addr;
+};
+
+struct pcidev_dma_s {
+    pcilib_dma_context_t dmactx;
+
+    pcilib_kmem_handle_t *desc;		/**< in-memory status descriptor written by DMA engine upon operation progess */
+    pcilib_kmem_handle_t *pages;	/**< collection of memory-locked pages for DMA operation */
+
+    pcilib_dma_engine_t rdma;
+
+    uint32_t version;			/**< hardware revision */
+
+    int started;			/**< indicates that DMA buffers are initialized and reading is allowed */
+    int writting;			/**< indicates that we are in middle of writting packet */
+    int reused;				/**< indicates that DMA was found intialized, buffers were reused, and no additional initialization is needed */
+    int preserve;			/**< indicates that DMA should not be stopped during clean-up */
+
+    uint32_t dma_flags;			/**< Various operation flags, see PCIDEV_DMA_FLAG_* */
+    size_t dma_timeout;			/**< DMA timeout, PCIDEV_DMA_TIMEOUT is used by default */
+    size_t dma_pages;			/**< Number of DMA pages in ring buffer to allocate */
+
+    size_t ring_size, page_size;	/**< Number of pages in ring buffer and the size of a single DMA page */
+    size_t last_read;
+};
+
+#endif /* _PCIDEV_DMA_PRIVATE_H */