[PATCH] drm/amdgpu: recreate retired page's bo if vram get lost in gpu reset

[Chen, Guchun]

-----Original Message-----
From: Zhou1, Tao <Tao.Zhou1 at amd.com> 
Sent: Sunday, September 29, 2019 2:35 PM
To: amd-gfx at lists.freedesktop.org; Grodzovsky, Andrey <Andrey.Grodzovsky at amd.com>; Chen, Guchun <Guchun.Chen at amd.com>; Zhang, Hawking <Hawking.Zhang at amd.com>
Cc: Zhou1, Tao <Tao.Zhou1 at amd.com>
Subject: [PATCH] drm/amdgpu: recreate retired page's bo if vram get lost in gpu reset

the info of retired page's bo may be lost if vram lost is encountered in gpu reset (gpu page table in vram may be lost), force to recreate all bos

Signed-off-by: Tao Zhou <tao.zhou1 at amd.com>
Suggested-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c    | 44 ++++++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h    |  1 +
 3 files changed, 46 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 62955156653c..a89f6d053b3f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -3675,6 +3675,7 @@ static int amdgpu_do_asic_reset(struct amdgpu_hive_info *hive,
 				if (vram_lost) {
 					DRM_INFO("VRAM is lost due to GPU reset!\n");
 					amdgpu_inc_vram_lost(tmp_adev);
+					amdgpu_ras_recovery_reset(tmp_adev);
 				}
 
 				r = amdgpu_gtt_mgr_recover(
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
index 486568ded6d6..1b3b597aa973 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
@@ -1573,6 +1573,50 @@ static int amdgpu_ras_recovery_fini(struct amdgpu_device *adev)
 
 	return 0;
 }
+
+/*
+ * the info of retired page's bo may be lost if vram lost is 
+encountered
+ * in gpu reset (gpu page table in vram may be lost), force to recreate
+ * all bos
+ */
+void amdgpu_ras_recovery_reset(struct amdgpu_device *adev) {
+	struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
+	struct ras_err_handler_data *data;
+	uint64_t bp;
+	struct amdgpu_bo *bo = NULL;
+	int i;
+
+	if (!con)
+		return;
+
+	data = con->eh_data;
+	if (!data)
+		return;
+
+	/* force to reserve all retired page again */
+	data->last_reserved = 0;
+
+	for (i = data->last_reserved; i < data->count; i++) {
+		bp = data->bps[i].retired_page;
+
+		/* There are three cases of reserve error should be ignored:
+		 * 1) a ras bad page has been allocated (used by someone);
+		 * 2) a ras bad page has been reserved (duplicate error injection
+		 *    for one page);
+		 * 3) bo info isn't lost in gpu reset
+		 */
+		if (amdgpu_bo_create_kernel_at(adev, bp << AMDGPU_GPU_PAGE_SHIFT,
+					       AMDGPU_GPU_PAGE_SIZE,
+					       AMDGPU_GEM_DOMAIN_VRAM,
+					       &bo, NULL))
+			DRM_NOTE("RAS NOTE: recreate bo for retired page 0x%llx fail\n", bp);
+		else
+			data->bps_bo[i] = bo;
+		data->last_reserved = i + 1;
+		bo = NULL;
+	}
[Guchun] In amdgpu_ras.c, we have another function amdgpu_ras_reserve_bad_pages, which has the same bo creation code as above.
So can we put these common codes into another internal func dedicated for bo creating jobs to reduce code lines and get this internal func being called by amdgpu_ras_reserve_bad_pages and amdgpu_ras_recovery_reset respectively?
+}
 /* recovery end */
 
 /* return 0 if ras will reset gpu and repost.*/ diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
index f80fd3428c98..7a606d3be806 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
@@ -479,6 +479,7 @@ static inline int amdgpu_ras_is_supported(struct amdgpu_device *adev,  }
 
 int amdgpu_ras_recovery_init(struct amdgpu_device *adev);
+void amdgpu_ras_recovery_reset(struct amdgpu_device *adev);
 int amdgpu_ras_request_reset_on_boot(struct amdgpu_device *adev,
 		unsigned int block);
 
--
2.17.1