From: Shashank Sharma <contactshashanksharma@xxxxxxxxx>
This patch adds helper functions to create and free doorbell
pages for kernel objects.
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: Christian Koenig <christian.koenig@xxxxxxx>
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell.h | 41 ++++++++++++++++
.../gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c | 49 +++++++++++++++++++
2 files changed, 90 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell.h
index f9c3b77bf65d..6581b78fe438 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell.h
@@ -27,6 +27,24 @@
/*
* GPU doorbell structures, functions & helpers
*/
+
+/* Structure to hold doorbell pages from PCI doorbell BAR */
+struct amdgpu_doorbell_obj {
+ struct amdgpu_bo *bo;
+ uint64_t gpu_addr;
+ uint32_t *cpu_addr;
+ uint32_t size;
+
+ /* First index in this object */
+ uint32_t start;
+
+ /* Last index in this object */
+ uint32_t end;
+
+ /* bitmap for dynamic doorbell allocation from this object */
+ unsigned long *doorbell_bitmap;
+};
+
struct amdgpu_doorbell {
/* doorbell mmio */
resource_size_t base;
@@ -328,6 +346,29 @@ int amdgpu_device_doorbell_init(struct amdgpu_device *adev);
*/
void amdgpu_device_doorbell_fini(struct amdgpu_device *adev);
+/**
+ * amdgpu_doorbell_free_page - Free a doorbell page
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * @db_age: previously allocated doobell page details
+ *
+ */
+void amdgpu_doorbell_free_page(struct amdgpu_device *adev,
+ struct amdgpu_doorbell_obj *db_obj);
+
+/**
+ * amdgpu_doorbell_alloc_page - create a page from doorbell pool
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * @db_age: doobell page structure to fill details with
+ *
+ * returns 0 on success, else error number
+ */
+int amdgpu_doorbell_alloc_page(struct amdgpu_device *adev,
+ struct amdgpu_doorbell_obj *db_obj);
+
#define RDOORBELL32(index) amdgpu_mm_rdoorbell(adev, (index))
#define WDOORBELL32(index, v) amdgpu_mm_wdoorbell(adev, (index), (v))
#define RDOORBELL64(index) amdgpu_mm_rdoorbell64(adev, (index))
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c
index 1aea92363fd3..8be15b82b545 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c
@@ -111,6 +111,55 @@ void amdgpu_mm_wdoorbell64(struct amdgpu_device *adev, u32 index, u64 v)
}
}
+/**
+ * amdgpu_doorbell_free_page - Free a doorbell page
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * @db_age: previously allocated doobell page details
+ *
+ */
+void amdgpu_doorbell_free_page(struct amdgpu_device *adev,
+ struct amdgpu_doorbell_obj *db_obj)
+{
+ amdgpu_bo_free_kernel(&db_obj->bo,
+ &db_obj->gpu_addr,
+ (void **)&db_obj->cpu_addr);
+
+}
+
+/**
+ * amdgpu_doorbell_alloc_page - create a page from doorbell pool
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * @db_age: doobell page structure to fill details with
+ *
+ * returns 0 on success, else error number
+ */
+int amdgpu_doorbell_alloc_page(struct amdgpu_device *adev,
+ struct amdgpu_doorbell_obj *db_obj)
+{
+ int r;
+
+ db_obj->size = ALIGN(db_obj->size, PAGE_SIZE);
+
+ r = amdgpu_bo_create_kernel(adev,
+ db_obj->size,
+ PAGE_SIZE,
+ AMDGPU_GEM_DOMAIN_DOORBELL,
+ &db_obj->bo,
+ &db_obj->gpu_addr,
+ (void **)&db_obj->cpu_addr);
+
+ if (r) {
+ DRM_ERROR("Failed to create doorbell BO, err=%d\n", r);
+ return r;
+ }
+
+ return 0;
+}
+
/*
* GPU doorbell aperture helpers function.
*/
--
2.40.0
