Re: [PATCH 1/5] drm/ttm: add drm_gem_ttm_print_info()

From: Thomas Zimmermann
Date: Mon Sep 02 2019 - 10:19:59 EST

Hi

Acked-by: Thomas Zimmermann <tzimmermann@xxxxxxx>

But please see below.

Am 02.09.19 um 14:41 schrieb Gerd Hoffmann:
> Now with ttm_buffer_object being a subclass of drm_gem_object we can
> easily lookup ttm_buffer_object for a given drm_gem_object, which in
> turm allows to create common helper functions.

s/trum/trun

>
> This patch starts off with a drm_gem_ttm_print_info() helper function
> which prints adds some ttm specific lines to the debug output.
>
> Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> ---
> include/drm/drm_gem_ttm_helper.h | 19 ++++++++
> drivers/gpu/drm/drm_gem_ttm_helper.c | 67 ++++++++++++++++++++++++++++
> Documentation/gpu/drm-mm.rst | 12 +++++
> drivers/gpu/drm/Kconfig | 7 +++
> drivers/gpu/drm/Makefile | 3 ++
> 5 files changed, 108 insertions(+)
> create mode 100644 include/drm/drm_gem_ttm_helper.h
> create mode 100644 drivers/gpu/drm/drm_gem_ttm_helper.c
>
> diff --git a/include/drm/drm_gem_ttm_helper.h b/include/drm/drm_gem_ttm_helper.h
> new file mode 100644
> index 000000000000..6268f89c5a48
> --- /dev/null
> +++ b/include/drm/drm_gem_ttm_helper.h
> @@ -0,0 +1,19 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +
> +#ifndef DRM_GEM_TTM_HELPER_H
> +#define DRM_GEM_TTM_HELPER_H
> +
> +#include <linux/kernel.h>
> +
> +#include <drm/drm_gem.h>
> +#include <drm/drm_device.h>
> +#include <drm/ttm/ttm_bo_api.h>
> +#include <drm/ttm/ttm_bo_driver.h>
> +
> +#define drm_gem_ttm_of_gem(gem_obj) \
> + container_of(gem_obj, struct ttm_buffer_object, base)
> +
> +void drm_gem_ttm_print_info(struct drm_printer *p, unsigned int indent,
> + const struct drm_gem_object *gem);
> +
> +#endif
> diff --git a/drivers/gpu/drm/drm_gem_ttm_helper.c b/drivers/gpu/drm/drm_gem_ttm_helper.c
> new file mode 100644
> index 000000000000..cd6ac2cc8fdd
> --- /dev/null
> +++ b/drivers/gpu/drm/drm_gem_ttm_helper.c
> @@ -0,0 +1,67 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +
> +#include <linux/module.h>
> +
> +#include <drm/drm_gem_ttm_helper.h>
> +
> +/**
> + * DOC: overview
> + *
> + * This library provides helper functions for gem objects backed by
> + * ttm.
> + */
> +
> +/**
> + * drm_gem_ttm_print_info() - Print &ttm_buffer_object info for debugfs
> + * @p: DRM printer
> + * @indent: Tab indentation level
> + * @gem: GEM object
> + *
> + * This function can be used as the &drm_driver->gem_print_info callback.
> + */
> +void drm_gem_ttm_print_info(struct drm_printer *p, unsigned int indent,
> + const struct drm_gem_object *gem)
> +{
> + static const char *plname[] = {

The array and the strings should be declared const. IIRC something like

static const char * const plname[] = {

> + [ TTM_PL_SYSTEM ] = "system",
> + [ TTM_PL_TT ] = "tt",
> + [ TTM_PL_VRAM ] = "vram",
> + [ TTM_PL_PRIV ] = "priv",
> +

This 'gap' in the array seems to be a problem for drivers that use these
bits. Could the print logic be moved into s separate function that also
takes the array as an argument?

Best regards
Thomas

> + [ 16 ] = "cached",
> + [ 17 ] = "uncached",
> + [ 18 ] = "wc",
> + [ 19 ] = "contig",
> +
> + [ 21 ] = "pinned", /* NO_EVICT */
> + [ 22 ] = "topdown",
> + };
> + const struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
> + bool first = true;
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(plname); i++) {
> + if (!(bo->mem.placement & (1 << i)))
> + continue;
> + if (!plname[i])
> + continue;
> + if (first) {
> + first = false;
> + drm_printf_indent(p, indent, "placement=%s", plname[i]);
> + } else
> + drm_printf(p, ",%s", plname[i]);
> + }
> + if (!first)
> + drm_printf(p, "\n");
> +
> + if (bo->mem.bus.is_iomem) {
> + drm_printf_indent(p, indent, "bus.base=%lx\n",
> + (unsigned long)bo->mem.bus.base);
> + drm_printf_indent(p, indent, "bus.offset=%lx\n",
> + (unsigned long)bo->mem.bus.offset);
> + }
> +}
> +EXPORT_SYMBOL(drm_gem_ttm_print_info);
> +
> +MODULE_DESCRIPTION("DRM gem ttm helpers");
> +MODULE_LICENSE("GPL");
> diff --git a/Documentation/gpu/drm-mm.rst b/Documentation/gpu/drm-mm.rst
> index b664f054c259..a70a1d9f30ec 100644
> --- a/Documentation/gpu/drm-mm.rst
> +++ b/Documentation/gpu/drm-mm.rst
> @@ -412,6 +412,18 @@ VRAM MM Helper Functions Reference
> .. kernel-doc:: drivers/gpu/drm/drm_vram_mm_helper.c
> :export:
>
> +GEM TTM Helper Functions Reference
> +-----------------------------------
> +
> +.. kernel-doc:: drivers/gpu/drm/drm_gem_ttm_helper.c
> + :doc: overview
> +
> +.. kernel-doc:: include/drm/drm_gem_ttm_helper.h
> + :internal:
> +
> +.. kernel-doc:: drivers/gpu/drm/drm_gem_ttm_helper.c
> + :export:
> +
> VMA Offset Manager
> ==================
>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index e6f40fb54c9a..f7b25519f95c 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -172,6 +172,13 @@ config DRM_VRAM_HELPER
> help
> Helpers for VRAM memory management
>
> +config DRM_TTM_HELPER
> + tristate
> + depends on DRM
> + select DRM_TTM
> + help
> + Helpers for ttm-based gem objects
> +
> config DRM_GEM_CMA_HELPER
> bool
> depends on DRM
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 10f8329a8b71..545c61d6528b 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -37,6 +37,9 @@ drm_vram_helper-y := drm_gem_vram_helper.o \
> drm_vram_mm_helper.o
> obj-$(CONFIG_DRM_VRAM_HELPER) += drm_vram_helper.o
>
> +drm_ttm_helper-y := drm_gem_ttm_helper.o
> +obj-$(CONFIG_DRM_TTM_HELPER) += drm_ttm_helper.o
> +
> drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_dsc.o drm_probe_helper.o \
> drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o \
> drm_kms_helper_common.o drm_dp_dual_mode_helper.o \
>

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Linux GmbH, Maxfeldstrasse 5, 90409 Nuernberg, Germany
GF: Felix ImendÃrffer, Mary Higgins, Sri Rasiah
HRB 21284 (AG NÃrnberg)

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