Alpha needs to have available the system bus address for the Radeon's local memory, so that it can be used in ttm_bo_vm_fault(), when building the PTEs for accessing that VRAM. So, we make bus.addr hold the ioremap() return, and then we can modify bus.base appropriately for use during page fault processing.
Signed-off-by: Jay Estabrook jay.estabrook@gmail.com --- drivers/gpu/drm/radeon/radeon_ttm.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
diff -Naurp a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c --- a/drivers/gpu/drm/radeon/radeon_ttm.c 2011-04-26 23:48:50.000000000 -0400 +++ b/drivers/gpu/drm/radeon/radeon_ttm.c 2011-05-03 18:24:27.000000000 -0400 @@ -450,6 +450,29 @@ static int radeon_ttm_io_mem_reserve(str return -EINVAL; mem->bus.base = rdev->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); + + /* + * 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) + + rdev->ddev->hose->dense_mem_base; +#endif break; default: return -EINVAL;