[PATCH 66/66] drm/amdgpu: add an option to override IP discovery table from a file

[Alex Deucher]

If you set amdgpu.discovery=2 you can force the the driver to
fetch the IP discovery table from a file rather than from the
table shipped on the device.  This is useful for debugging and
for device bring up and emulation when the tables may be in flux.

Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c | 24 +++++++++++++++----
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c       |  2 +-
 2 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
index 821665fb73b0..7ff8b551b64f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
@@ -21,6 +21,8 @@
  *
  */
 
+#include <linux/firmware.h>
+
 #include "amdgpu.h"
 #include "amdgpu_discovery.h"
 #include "soc15_hw_ip.h"
@@ -67,6 +69,8 @@
 #include "smuio_v11_0_6.h"
 #include "smuio_v13_0.h"
 
+MODULE_FIRMWARE("amdgpu/ip_discovery.bin");
+
 #define mmRCC_CONFIG_MEMSIZE   0xde3
 #define mmMM_INDEX             0x0
 #define mmMM_INDEX_HI          0x6
@@ -206,6 +210,7 @@ static int amdgpu_discovery_init(struct amdgpu_device *adev)
        struct binary_header *bhdr;
        struct ip_discovery_header *ihdr;
        struct gpu_info_header *ghdr;
+       const struct firmware *fw;
        uint16_t offset;
        uint16_t size;
        uint16_t checksum;
@@ -216,10 +221,21 @@ static int amdgpu_discovery_init(struct amdgpu_device 
*adev)
        if (!adev->mman.discovery_bin)
                return -ENOMEM;
 
-       r = amdgpu_discovery_read_binary(adev, adev->mman.discovery_bin);
-       if (r) {
-               DRM_ERROR("failed to read ip discovery binary\n");
-               goto out;
+       if (amdgpu_discovery == 2) {
+               r = request_firmware(&fw, "amdgpu/ip_discovery.bin", adev->dev);
+               if (r)
+                       goto get_from_vram;
+               dev_info(adev->dev, "Using IP discovery from file\n");
+               memcpy((u8 *)adev->mman.discovery_bin, (u8 *)fw->data,
+                      adev->mman.discovery_tmr_size);
+               release_firmware(fw);
+       } else {
+get_from_vram:
+               r = amdgpu_discovery_read_binary(adev, 
adev->mman.discovery_bin);
+               if (r) {
+                       DRM_ERROR("failed to read ip discovery binary\n");
+                       goto out;
+               }
        }
 
        bhdr = (struct binary_header *)adev->mman.discovery_bin;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index c7da1f7cc880..ec0a2fd7c163 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -628,7 +628,7 @@ module_param_named(mcbp, amdgpu_mcbp, int, 0444);
 /**
  * DOC: discovery (int)
  * Allow driver to discover hardware IP information from IP Discovery table at 
the top of VRAM.
- * (-1 = auto (default), 0 = disabled, 1 = enabled)
+ * (-1 = auto (default), 0 = disabled, 1 = enabled, 2 = use ip_discovery table 
from file)
  */
 MODULE_PARM_DESC(discovery,
        "Allow driver to discover hardware IPs from IP Discovery table at the 
top of VRAM");
-- 
2.31.1