Am 15.05.2018 um 16:50 schrieb Alex Deucher:
From: Feifei Xu <feifei...@amd.com>
Users can pass in an array to decide enable/disable Zero Frame Buffer.
zfb[0] = zfb_size(MB), zfb[1] = zfb_phys_addr(MB).
If zbf_size > 0, zfb is enabled. Otherwise disabled.
Usage for example:
modprobe amdgpu zfb=256,4096
I still vote for using the CMA instead of this hack for that.
Should be trivial to implement and is far less error prone than manually
messing with memory configuration.
Christian.
Signed-off-by: Feifei Xu <feifei...@amd.com>
Acked-by: John Bridgman <john.bridg...@amd.com>
Reviewed-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 +
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 4 ++++
2 files changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 2d7500921c0b..dc55b73cbeed 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -130,6 +130,7 @@ extern int amdgpu_compute_multipipe;
extern int amdgpu_gpu_recovery;
extern int amdgpu_emu_mode;
extern uint amdgpu_smu_memory_pool_size;
+extern ulong amdgpu_zfb[];
#ifdef CONFIG_DRM_AMDGPU_SI
extern int amdgpu_si_support;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 739e7e09c8b0..a7a81ddab721 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -134,6 +134,7 @@ int amdgpu_compute_multipipe = -1;
int amdgpu_gpu_recovery = -1; /* auto */
int amdgpu_emu_mode = 0;
uint amdgpu_smu_memory_pool_size = 0;
+ulong amdgpu_zfb[2] = {0,4096UL}; /* {0,0x100000000} */
MODULE_PARM_DESC(vramlimit, "Restrict VRAM for testing, in megabytes");
module_param_named(vramlimit, amdgpu_vram_limit, int, 0600);
@@ -292,6 +293,9 @@ module_param_named(gpu_recovery, amdgpu_gpu_recovery, int,
0444);
MODULE_PARM_DESC(emu_mode, "Emulation mode, (1 = enable, 0 = disable)");
module_param_named(emu_mode, amdgpu_emu_mode, int, 0444);
+MODULE_PARM_DESC(zfb,
+ "Enable Zero Frame Buffer feature (zfb will be set like xxxx,xxxx(zfb_size
MB,zfb_phys_addr MB),default disabled)");
+module_param_array_named(zfb, amdgpu_zfb, ulong, NULL, 0444);
#ifdef CONFIG_DRM_AMDGPU_SI
#if defined(CONFIG_DRM_RADEON) || defined(CONFIG_DRM_RADEON_MODULE)
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