From: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
Introduce drm_pagemap ops to map and unmap dma to VRAM resources. In the
local memory case it's a matter of merely providing an offset into the
device's physical address. For future p2p the map and unmap functions may
encode as needed.
Similar to how dma-buf works, let the memory provider (drm_pagemap) provide
the mapping functionality.
v3:
- Move to drm level include
v4:
- Fix kernel doc (G.G.)
v5:
- s/map_dma/device_map (Thomas)
- s/unmap_dma/device_unmap (Thomas)
Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
Signed-off-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
Reviewed-by: Matthew Brost <matthew.brost@xxxxxxxxx>
---
include/drm/drm_pagemap.h | 105 ++++++++++++++++++++++++++++++++++++++
1 file changed, 105 insertions(+)
create mode 100644 include/drm/drm_pagemap.h
diff --git a/include/drm/drm_pagemap.h b/include/drm/drm_pagemap.h
new file mode 100644
index 000000000000..2634abb1e8bf
--- /dev/null
+++ b/include/drm/drm_pagemap.h
@@ -0,0 +1,105 @@
+/* SPDX-License-Identifier: MIT */
+#ifndef _DRM_PAGEMAP_H_
+#define _DRM_PAGEMAP_H_
+
+#include <linux/dma-direction.h>
+#include <linux/hmm.h>
+#include <linux/types.h>
+
+struct drm_pagemap;
+struct device;
+
+/**
+ * enum drm_interconnect_protocol - Used to identify an interconnect protocol.
+ */
+enum drm_interconnect_protocol {
+ DRM_INTERCONNECT_SYSTEM, /* DMA map is system pages. */
+ DRM_INTERCONNECT_PCIE_P2P, /* DMA map is PCIE P2P */
+ DRM_INTERCONNECT_DRIVER, /* DMA map is driver defined */
+ /* A driver can add private values beyond DRM_INTERCONNECT_DRIVER */
+};
+
+/**
+ * struct drm_pagemap_device_addr - Device address representation.
+ * @addr: The dma address or driver-defined address for driver private interconnects.
+ * @proto: The interconnect protocol.
+ * @order: The page order of the device mapping. (Size is PAGE_SIZE << order).
+ * @dir: The DMA direction.
+ *
+ * Note: There is room for improvement here. We should be able to pack into
+ * 64 bits.
+ */
+struct drm_pagemap_device_addr {
+ dma_addr_t addr;
+ u64 proto : 54;
+ u64 order : 8;
+ u64 dir : 2;
+};
+
+/**
+ * drm_pagemap_device_addr_encode() - Encode a dma address with metadata
+ * @addr: The dma address or driver-defined address for driver private interconnects.
+ * @proto: The interconnect protocol.
+ * @order: The page order of the dma mapping. (Size is PAGE_SIZE << order).
+ * @dir: The DMA direction.
+ *
+ * Return: A struct drm_pagemap_device_addr encoding the above information.
+ */
+static inline struct drm_pagemap_device_addr
+drm_pagemap_device_addr_encode(dma_addr_t addr,
+ enum drm_interconnect_protocol proto,
+ unsigned int order,
+ enum dma_data_direction dir)
+{
+ return (struct drm_pagemap_device_addr) {
+ .addr = addr,
+ .proto = proto,
+ .order = order,
+ .dir = dir,
+ };
+}
+
+/**
+ * struct drm_pagemap_ops: Ops for a drm-pagemap.
+ */
+struct drm_pagemap_ops {
+ /**
+ * @device_map: Map for device access or provide a virtual address suitable for
+ *
+ * @dpagemap: The struct drm_pagemap for the page.
+ * @dev: The device mapper.
+ * @page: The page to map.
+ * @order: The page order of the device mapping. (Size is PAGE_SIZE << order).
+ * @dir: The transfer direction.
+ */
+ struct drm_pagemap_device_addr (*device_map)(struct drm_pagemap *dpagemap,
+ struct device *dev,
+ struct page *page,
+ unsigned int order,
+ enum dma_data_direction dir);
+
+ /**
+ * @device_unmap: Unmap a device address previously obtained using @device_map.
+ *
+ * @dpagemap: The struct drm_pagemap for the mapping.
+ * @dev: The device unmapper.
+ * @addr: The device address obtained when mapping.
+ */
+ void (*device_unmap)(struct drm_pagemap *dpagemap,
+ struct device *dev,
+ struct drm_pagemap_device_addr addr);
+
+};
+
+/**
+ * struct drm_pagemap: Additional information for a struct dev_pagemap
+ * used for device p2p handshaking.
+ * @ops: The struct drm_pagemap_ops.
+ * @dev: The struct drevice owning the device-private memory.
+ */
+struct drm_pagemap {
+ const struct drm_pagemap_ops *ops;
+ struct device *dev;
+};
+
+#endif
--
2.34.1
