video: tegra: host: Enhance FIFO/GATHER debug_dumptegra-l4t-er-2011-11-16

Enhance nvhost_debug_dump() output, as follows:

- Swap FIFO and GATHER dump so that even if GATHER dump blows out
  seq_printf 1k buffer, we still have FIFO information;
- Write FIFO signature pattern (0xd???d???) to indirect save input
  data to help pinpoint FIFO position within debug dumps;
- Prevent long data sequences from blowing out the seq_printf 1k
  buffer, by limiting such sequences to 64 words.

Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/62424
(cherry picked from commit cb37e4212b78546411b33b32044f30feb0579b86)
Change-Id: Ia2695c502fa0c7b755ef2ae51260650c7d67bf86
Reviewed-on: http://git-master/r/64061
Reviewed-by: Yu-Huan Hsu <yhsu@nvidia.com>

1 files changed, 13 insertions, 6 deletions

diff --git a/drivers/video/tegra/host/t20/3dctx_t20.c b/drivers/video/tegra/host/t20/3dctx_t20.c
index 7ac1b5e118cd..d0609fb61976 100644
--- a/drivers/video/tegra/host/t20/3dctx_t20.c
+++ b/drivers/video/tegra/host/t20/3dctx_t20.c
@@ -138,8 +138,8 @@ static void save_push_v0(struct nvhost_cdma *cdma,
 			struct nvhost_hwctx *ctx)
 {
 	nvhost_cdma_push_gather(cdma,
-			cdma_to_channel(cdma)->dev->nvmap,
-			nvmap_ref_to_handle(nvhost_3dctx_save_buf),
+			(void *)NVHOST_CDMA_PUSH_GATHER_CTXSAVE,
+			(void *)NVHOST_CDMA_PUSH_GATHER_CTXSAVE,
 			nvhost_opcode_gather(save_size),
 			save_phys);
 }
@@ -260,7 +260,17 @@ static void __init setup_save_regs(struct save_info *info,
 			break;
 		}
 		if (ptr) {
-			memset(ptr, 0, count * 4);
+			/* SAVE cases only: reserve room for incoming data */
+			u32 k = 0;
+			/*
+			 * Create a signature pattern for indirect data (which
+			 * will be overwritten by true incoming data) for
+			 * better deducing where we are in a long command
+			 * sequence, when given only a FIFO snapshot for debug
+			 * purposes.
+			*/
+			for (k = 0; k < count; k++)
+				*(ptr + k) = 0xd000d000 | (offset << 16) | k;
 			ptr += count;
 		}
 		save_count += count;
@@ -332,9 +342,6 @@ static void ctx3d_save_service(struct nvhost_hwctx *ctx)
 	nvhost_syncpt_cpu_incr(&ctx->channel->dev->syncpt, NVSYNCPT_3D);
 }
 
-
-/*** savers ***/
-
 int __init t20_nvhost_3dctx_handler_init(struct nvhost_hwctx_handler *h)
 {
 	struct nvhost_channel *ch;