From 832be4041d4999e008839d12d1efe118da27bd99 Mon Sep 17 00:00:00 2001 From: Ken Wang Date: Fri, 18 Mar 2016 15:23:08 +0800 Subject: drm/amdgpu: add 64bit doorbell functions (v2) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Newer asics need 64 bit doorbells. v2: fix comment (Nils) Reviewed-by: Christian König Signed-off-by: Ken Wang Reviewed-by: Alex Deucher Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 38 ++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_device.c') diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index fcf83178b113..ff0b9920ea79 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -194,6 +194,44 @@ void amdgpu_mm_wdoorbell(struct amdgpu_device *adev, u32 index, u32 v) } } +/** + * amdgpu_mm_rdoorbell64 - read a doorbell Qword + * + * @adev: amdgpu_device pointer + * @index: doorbell index + * + * Returns the value in the doorbell aperture at the + * requested doorbell index (VEGA10+). + */ +u64 amdgpu_mm_rdoorbell64(struct amdgpu_device *adev, u32 index) +{ + if (index < adev->doorbell.num_doorbells) { + return atomic64_read((atomic64_t *)(adev->doorbell.ptr + index)); + } else { + DRM_ERROR("reading beyond doorbell aperture: 0x%08x!\n", index); + return 0; + } +} + +/** + * amdgpu_mm_wdoorbell64 - write a doorbell Qword + * + * @adev: amdgpu_device pointer + * @index: doorbell index + * @v: value to write + * + * Writes @v to the doorbell aperture at the + * requested doorbell index (VEGA10+). + */ +void amdgpu_mm_wdoorbell64(struct amdgpu_device *adev, u32 index, u64 v) +{ + if (index < adev->doorbell.num_doorbells) { + atomic64_set((atomic64_t *)(adev->doorbell.ptr + index), v); + } else { + DRM_ERROR("writing beyond doorbell aperture: 0x%08x!\n", index); + } +} + /** * amdgpu_invalid_rreg - dummy reg read function * -- cgit