[PATCH 3/5] drm: msm: a6xx: Dump GBIF registers, debugbus in gpu state
Jordan Crouse
jcrouse at codeaurora.org
Mon Dec 16 16:17:23 UTC 2019
On Tue, Dec 03, 2019 at 03:06:12PM +0000, Sharat Masetty wrote:
> Add the relevant GBIF registers and the debug bus to the a6xx gpu
> state. This comes in pretty handy when debugging GPU bus related
> issues.
>
> Change-Id: I224fda727012a456ccd28ca14caf9fcce236e629
> Signed-off-by: Sharat Masetty <smasetty at codeaurora.org>
> ---
> drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c | 52 +++++++++++++++++++++++------
> drivers/gpu/drm/msm/adreno/a6xx_gpu_state.h | 16 +++++++--
> 2 files changed, 55 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
> index e686331..99b5a41 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
> @@ -1,5 +1,5 @@
> // SPDX-License-Identifier: GPL-2.0
> -/* Copyright (c) 2018 The Linux Foundation. All rights reserved. */
> +/* Copyright (c) 2018-2019 The Linux Foundation. All rights reserved. */
>
> #include <linux/ascii85.h>
> #include "msm_gem.h"
> @@ -320,6 +320,7 @@ static void a6xx_get_debugbus(struct msm_gpu *gpu,
> {
> struct resource *res;
> void __iomem *cxdbg = NULL;
> + int nr_debugbus_blocks;
>
> /* Set up the GX debug bus */
>
> @@ -374,9 +375,11 @@ static void a6xx_get_debugbus(struct msm_gpu *gpu,
> cxdbg_write(cxdbg, REG_A6XX_DBGC_CFG_DBGBUS_MASKL_3, 0);
> }
>
> - a6xx_state->debugbus = state_kcalloc(a6xx_state,
> - ARRAY_SIZE(a6xx_debugbus_blocks),
> - sizeof(*a6xx_state->debugbus));
> + nr_debugbus_blocks = ARRAY_SIZE(a6xx_debugbus_blocks) +
> + (a6xx_has_gbif(to_adreno_gpu(gpu)) ? 1 : 0);
> +
> + a6xx_state->debugbus = state_kcalloc(a6xx_state, nr_debugbus_blocks,
> + sizeof(*a6xx_state->debugbus));
>
> if (a6xx_state->debugbus) {
> int i;
VBIF died with the A630, never to return. Instead of a single function that
uses if statements all over the place we should split this into two functions -
a630_get_debugbus and a6xx_get_debugbus and treat GBIF as the default and VBIF
as the exception. It might result in a bit more code duplication but IMO is
better than forcing all future targets through a half dozen logic checks that
will always be true.
> @@ -388,15 +391,31 @@ static void a6xx_get_debugbus(struct msm_gpu *gpu,
> &a6xx_state->debugbus[i]);
>
> a6xx_state->nr_debugbus = ARRAY_SIZE(a6xx_debugbus_blocks);
> +
> + /*
> + * GBIF has same debugbus as of other GPU blocks, fall back to
> + * default path if GPU uses GBIF, also GBIF uses exactly same
> + * ID as of VBIF.
> + */
> + if (a6xx_has_gbif(to_adreno_gpu(gpu))) {
> + a6xx_get_debugbus_block(gpu, a6xx_state,
> + &a6xx_gbif_debugbus_block,
> + &a6xx_state->debugbus[i]);
> +
> + a6xx_state->nr_debugbus += 1;
> + }
> }
>
> - a6xx_state->vbif_debugbus =
> - state_kcalloc(a6xx_state, 1,
> - sizeof(*a6xx_state->vbif_debugbus));
> + /* Dump the VBIF debugbus on applicable targets */
> + if (!a6xx_has_gbif(to_adreno_gpu(gpu))) {
> + a6xx_state->vbif_debugbus =
> + state_kcalloc(a6xx_state, 1,
> + sizeof(*a6xx_state->vbif_debugbus));
>
> - if (a6xx_state->vbif_debugbus)
> - a6xx_get_vbif_debugbus_block(gpu, a6xx_state,
> - a6xx_state->vbif_debugbus);
> + if (a6xx_state->vbif_debugbus)
> + a6xx_get_vbif_debugbus_block(gpu, a6xx_state,
> + a6xx_state->vbif_debugbus);
> + }
>
> if (cxdbg) {
> a6xx_state->cx_debugbus =
> @@ -770,14 +789,16 @@ static void a6xx_get_gmu_registers(struct msm_gpu *gpu,
> &a6xx_state->gmu_registers[1]);
> }
>
> +#define A6XX_GBIF_REGLIST_SIZE 1
> static void a6xx_get_registers(struct msm_gpu *gpu,
> struct a6xx_gpu_state *a6xx_state,
> struct a6xx_crashdumper *dumper)
> {
> int i, count = ARRAY_SIZE(a6xx_ahb_reglist) +
> ARRAY_SIZE(a6xx_reglist) +
> - ARRAY_SIZE(a6xx_hlsq_reglist);
> + ARRAY_SIZE(a6xx_hlsq_reglist) + A6XX_GBIF_REGLIST_SIZE;
> int index = 0;
> + struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
>
> a6xx_state->registers = state_kcalloc(a6xx_state,
> count, sizeof(*a6xx_state->registers));
> @@ -792,6 +813,15 @@ static void a6xx_get_registers(struct msm_gpu *gpu,
> a6xx_state, &a6xx_ahb_reglist[i],
> &a6xx_state->registers[index++]);
>
> + if (a6xx_has_gbif(adreno_gpu))
> + a6xx_get_ahb_gpu_registers(gpu,
> + a6xx_state, &a6xx_gbif_reglist,
> + &a6xx_state->registers[index++]);
> + else
> + a6xx_get_ahb_gpu_registers(gpu,
> + a6xx_state, &a6xx_vbif_reglist,
> + &a6xx_state->registers[index++]);
> +
> for (i = 0; i < ARRAY_SIZE(a6xx_reglist); i++)
> a6xx_get_crashdumper_registers(gpu,
> a6xx_state, &a6xx_reglist[i],
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.h b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.h
> index 68cccfa..e67c20c 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.h
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.h
> @@ -1,5 +1,5 @@
> // SPDX-License-Identifier: GPL-2.0
> -/* Copyright (c) 2018 The Linux Foundation. All rights reserved. */
> +/* Copyright (c) 2018-2019 The Linux Foundation. All rights reserved. */
>
> #ifndef _A6XX_CRASH_DUMP_H_
> #define _A6XX_CRASH_DUMP_H_
> @@ -307,11 +307,20 @@ struct a6xx_registers {
> 0x3410, 0x3410, 0x3800, 0x3801,
> };
>
> +static const u32 a6xx_gbif_registers[] = {
> + 0x3C00, 0X3C0B, 0X3C40, 0X3C47, 0X3CC0, 0X3CD1, 0xE3A, 0xE3A,
Lower case hex, please.
> +};
> +
> static const struct a6xx_registers a6xx_ahb_reglist[] = {
> REGS(a6xx_ahb_registers, 0, 0),
> - REGS(a6xx_vbif_registers, 0, 0),
> };
>
> +static const struct a6xx_registers a6xx_vbif_reglist =
> + REGS(a6xx_vbif_registers, 0, 0);
> +
> +static const struct a6xx_registers a6xx_gbif_reglist =
> + REGS(a6xx_gbif_registers, 0, 0);
> +
> static const u32 a6xx_gmu_gx_registers[] = {
> /* GMU GX */
> 0x0000, 0x0000, 0x0010, 0x0013, 0x0016, 0x0016, 0x0018, 0x001b,
> @@ -422,6 +431,9 @@ struct a6xx_registers {
> DEBUGBUS(A6XX_DBGBUS_TPL1_3, 0x100),
> };
>
> +static const struct a6xx_debugbus_block a6xx_gbif_debugbus_block =
> + DEBUGBUS(A6XX_DBGBUS_VBIF, 0x100);
> +
> static const struct a6xx_debugbus_block a6xx_cx_debugbus_blocks[] = {
> DEBUGBUS(A6XX_DBGBUS_GMU_CX, 0x100),
> DEBUGBUS(A6XX_DBGBUS_CX, 0x100),
> --
> 1.9.1
>
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