Re: [PATCH 4/6] drm/amdgpu: drop alpha support

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Am 30.03.2017 um 15:09 schrieb Alex Deucher:
On Thu, Mar 30, 2017 at 2:39 AM, Michel Dänzer <michel@xxxxxxxxxxx> wrote:
On 29/03/17 09:55 PM, Christian König wrote:
From: Christian König <christian.koenig@xxxxxxx>

We will probably never see this combination.

Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 25 -------------------------
  1 file changed, 25 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 7bf5ba7..524abca 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -538,31 +538,6 @@ static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_
                       return -EINVAL;
               mem->bus.base = adev->mc.aper_base;
               mem->bus.is_iomem = true;
-#ifdef __alpha__
-             /*
-              * Alpha: use bus.addr to hold the ioremap() return,
-              * so we can modify bus.base below.
-              */
-             if (mem->placement & TTM_PL_FLAG_WC)
-                     mem->bus.addr =
-                             ioremap_wc(mem->bus.base + mem->bus.offset,
-                                        mem->bus.size);
-             else
-                     mem->bus.addr =
-                             ioremap_nocache(mem->bus.base + mem->bus.offset,
-                                             mem->bus.size);
-             if (!mem->bus.addr)
-                     return -ENOMEM;
-
-             /*
-              * Alpha: Use just the bus offset plus
-              * the hose/domain memory base for bus.base.
-              * It then can be used to build PTEs for VRAM
-              * access, as done in ttm_bo_vm_fault().
-              */
-             mem->bus.base = (mem->bus.base & 0x0ffffffffUL) +
-                     adev->ddev->hose->dense_mem_base;
-#endif
               break;
       default:
               return -EINVAL;

Maybe leave an #error line, or make AMDGPU depend on !ALPHA in Kconfig,
to prevent somebody from trying this driver on an Alpha machine, and it
mysteriously failing due to the lack of this?

Either way,

Acked-by: Michel Dänzer <michel.daenzer@xxxxxxx>
Does this code even work on alpha (or compile for that matter)?  I
think this was blindly copied over from radeon UMS to radeon KMS to
amdgpu.

Yeah, I was questioning that myself as well.

I'm fine adding a !ALPHA to the Kconfig, but I'm quite sure that architecture is just dead.

Christian.


Alex


--
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer
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