[PATCH] drm/amdgpu: Allow to reset to EERPOM table.

[Andrey Grodzovsky]

The table grows quickly during debug/development effort when
multiple RAS errors are injected. Allow to avoid this by setting
table header back to empty if needed.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h            | 1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c        | 8 ++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c | 3 ++-
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 0d11aa8..405c55a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -169,6 +169,7 @@ extern int amdgpu_discovery;
 extern int amdgpu_mes;
 extern int amdgpu_noretry;
 extern int amdgpu_force_asic_type;
+extern int amdgpu_ras_eeprom_reset;
 
 #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 5a7f929..6e101a5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -145,6 +145,7 @@ int amdgpu_discovery = -1;
 int amdgpu_mes = 0;
 int amdgpu_noretry = 1;
 int amdgpu_force_asic_type = -1;
+int amdgpu_ras_eeprom_reset = -1;
 
 struct amdgpu_mgpu_info mgpu_info = {
 	.mutex = __MUTEX_INITIALIZER(mgpu_info.mutex),
@@ -530,6 +531,13 @@ MODULE_PARM_DESC(ras_mask, "Mask of RAS features to enable (default 0xffffffff),
 module_param_named(ras_mask, amdgpu_ras_mask, uint, 0444);
 
 /**
+ * DOC: ras_eeprom_reset (int)
+ * Reset EEPROM table to zerro entries.
+ */
+MODULE_PARM_DESC(ras_eeprom_reset, "Reset RAS EEPROM table to zerro entries (1 = reset, -1 = auto (default - don't reset)");
+module_param_named(ras_eeprom_reset, amdgpu_ras_eeprom_reset, int, 0444);
+
+/**
  * DOC: si_support (int)
  * Set SI support driver. This parameter works after set config CONFIG_DRM_AMDGPU_SI. For SI asic, when radeon driver is enabled,
  * set value 0 to use radeon driver, while set value 1 to use amdgpu driver. The default is using radeon driver when it available,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
index 43dd4ab..75c6fc0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
@@ -140,7 +140,8 @@ int amdgpu_ras_eeprom_init(struct amdgpu_ras_eeprom_control *control)
 
 	__decode_table_header_from_buff(hdr, &buff[2]);
 
-	if (hdr->header == EEPROM_TABLE_HDR_VAL) {
+	if (amdgpu_ras_eeprom_reset != 1 &&
+	    hdr->header == EEPROM_TABLE_HDR_VAL) {
 		control->num_recs = (hdr->tbl_size - EEPROM_TABLE_HEADER_SIZE) /
 				    EEPROM_TABLE_RECORD_SIZE;
 		DRM_DEBUG_DRIVER("Found existing EEPROM table with %d records",
-- 
2.7.4