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Message-ID: <508c32788930b591fdb578f4f406278a8818d771@intel.com>
Date: Tue, 02 Sep 2025 17:59:30 +0300
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Jocelyn Falempe <jfalempe@...hat.com>, Maarten Lankhorst
<maarten.lankhorst@...ux.intel.com>, Rodrigo Vivi
<rodrigo.vivi@...el.com>, Joonas Lahtinen
<joonas.lahtinen@...ux.intel.com>, Tvrtko Ursulin <tursulin@...ulin.net>,
Ville Syrjälä <ville.syrjala@...ux.intel.com>, David
Airlie
<airlied@...il.com>, Simona Vetter <simona@...ll.ch>, Christian Koenig
<christian.koenig@....com>, Huang Rui <ray.huang@....com>, Matthew Auld
<matthew.auld@...el.com>, Matthew Brost <matthew.brost@...el.com>, Maxime
Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
intel-gfx@...ts.freedesktop.org, intel-xe@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc: Jocelyn Falempe <jfalempe@...hat.com>
Subject: Re: [PATCH v11 06/11] drm/i915: Add intel_bo_alloc_framebuffer()
On Tue, 24 Jun 2025, Jocelyn Falempe <jfalempe@...hat.com> wrote:
> Encapsulate the struct intel_framebuffer into an xe_framebuffer
> or i915_framebuffer, and allow to add specific fields for each
> variant for the panic use-case.
> This is particularly needed to have a struct xe_res_cursor available
> to support drm panic on discrete GPU.
>
> Signed-off-by: Jocelyn Falempe <jfalempe@...hat.com>
> ---
>
> v11:
> * Added in v11
>
> drivers/gpu/drm/i915/display/i9xx_plane.c | 3 ++-
> drivers/gpu/drm/i915/display/intel_bo.c | 6 +++++
> drivers/gpu/drm/i915/display/intel_bo.h | 2 ++
> drivers/gpu/drm/i915/display/intel_fb.c | 2 +-
> .../drm/i915/display/skl_universal_plane.c | 2 +-
> drivers/gpu/drm/i915/gem/i915_gem_object.h | 2 ++
> drivers/gpu/drm/i915/gem/i915_gem_pages.c | 22 +++++++++++++++++
> drivers/gpu/drm/xe/display/intel_bo.c | 24 +++++++++++++++++++
> 8 files changed, 60 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/i9xx_plane.c b/drivers/gpu/drm/i915/display/i9xx_plane.c
> index e7e35fd4bdc3..f291ced989dc 100644
> --- a/drivers/gpu/drm/i915/display/i9xx_plane.c
> +++ b/drivers/gpu/drm/i915/display/i9xx_plane.c
> @@ -15,6 +15,7 @@
> #include "i9xx_plane.h"
> #include "i9xx_plane_regs.h"
> #include "intel_atomic.h"
> +#include "intel_bo.h"
> #include "intel_de.h"
> #include "intel_display_irq.h"
> #include "intel_display_regs.h"
> @@ -1174,7 +1175,7 @@ i9xx_get_initial_plane_config(struct intel_crtc *crtc,
>
> drm_WARN_ON(display->drm, pipe != crtc->pipe);
>
> - intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
> + intel_fb = intel_bo_alloc_framebuffer();
> if (!intel_fb) {
> drm_dbg_kms(display->drm, "failed to alloc fb\n");
> return;
> diff --git a/drivers/gpu/drm/i915/display/intel_bo.c b/drivers/gpu/drm/i915/display/intel_bo.c
> index fbd16d7b58d9..bcf2eded7469 100644
> --- a/drivers/gpu/drm/i915/display/intel_bo.c
> +++ b/drivers/gpu/drm/i915/display/intel_bo.c
> @@ -1,6 +1,7 @@
> // SPDX-License-Identifier: MIT
> /* Copyright © 2024 Intel Corporation */
>
> +#include "display/intel_display_types.h"
> #include "gem/i915_gem_mman.h"
> #include "gem/i915_gem_object.h"
> #include "gem/i915_gem_object_frontbuffer.h"
> @@ -57,3 +58,8 @@ void intel_bo_describe(struct seq_file *m, struct drm_gem_object *obj)
> {
> i915_debugfs_describe_obj(m, to_intel_bo(obj));
> }
> +
> +struct intel_framebuffer *intel_bo_alloc_framebuffer(void)
> +{
> + return i915_gem_object_alloc_framebuffer();
> +}
> diff --git a/drivers/gpu/drm/i915/display/intel_bo.h b/drivers/gpu/drm/i915/display/intel_bo.h
> index ea7a2253aaa5..315a81768c73 100644
> --- a/drivers/gpu/drm/i915/display/intel_bo.h
> +++ b/drivers/gpu/drm/i915/display/intel_bo.h
> @@ -7,6 +7,7 @@
> #include <linux/types.h>
>
> struct drm_gem_object;
> +struct intel_framebuffer;
> struct seq_file;
> struct vm_area_struct;
>
> @@ -23,5 +24,6 @@ struct intel_frontbuffer *intel_bo_set_frontbuffer(struct drm_gem_object *obj,
> struct intel_frontbuffer *front);
>
> void intel_bo_describe(struct seq_file *m, struct drm_gem_object *obj);
> +struct intel_framebuffer *intel_bo_alloc_framebuffer(void);
>
> #endif /* __INTEL_BO__ */
> diff --git a/drivers/gpu/drm/i915/display/intel_fb.c b/drivers/gpu/drm/i915/display/intel_fb.c
> index 763b36c4de10..6158031821fd 100644
> --- a/drivers/gpu/drm/i915/display/intel_fb.c
> +++ b/drivers/gpu/drm/i915/display/intel_fb.c
> @@ -2346,7 +2346,7 @@ intel_framebuffer_create(struct drm_gem_object *obj,
> struct intel_framebuffer *intel_fb;
> int ret;
>
> - intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
> + intel_fb = intel_bo_alloc_framebuffer();
> if (!intel_fb)
> return ERR_PTR(-ENOMEM);
>
> diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
> index 1ba04f1b3ec0..cbd0521a201c 100644
> --- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
> +++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
> @@ -3029,7 +3029,7 @@ skl_get_initial_plane_config(struct intel_crtc *crtc,
> return;
> }
>
> - intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
> + intel_fb = intel_bo_alloc_framebuffer();
> if (!intel_fb) {
> drm_dbg_kms(display->drm, "failed to alloc fb\n");
> return;
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
> index c34f41605b46..364941444a0a 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
> @@ -17,6 +17,7 @@
> #include "i915_vma_types.h"
>
> enum intel_region_id;
> +struct intel_framebuffer;
>
> #define obj_to_i915(obj__) to_i915((obj__)->base.dev)
>
> @@ -691,6 +692,7 @@ i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
> int __i915_gem_object_put_pages(struct drm_i915_gem_object *obj);
> int i915_gem_object_truncate(struct drm_i915_gem_object *obj);
>
> +struct intel_framebuffer *i915_gem_object_alloc_framebuffer(void);
> /**
> * i915_gem_object_pin_map - return a contiguous mapping of the entire object
> * @obj: the object to map into kernel address space
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
> index 7f83f8bdc8fb..10b84970f17f 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
> @@ -6,6 +6,7 @@
> #include <drm/drm_cache.h>
> #include <linux/vmalloc.h>
>
> +#include "display/intel_display_types.h"
This one slipped through... non-display parts of i915 should not be
adding more display/ includes, and should not poke at display data
types.
> #include "gt/intel_gt.h"
> #include "gt/intel_tlb.h"
>
> @@ -354,6 +355,27 @@ static void *i915_gem_object_map_pfn(struct drm_i915_gem_object *obj,
> return vaddr ?: ERR_PTR(-ENOMEM);
> }
>
> +struct i915_panic_data {
> + struct page **pages;
> + int page;
> + void *vaddr;
> +};
> +
> +struct i915_framebuffer {
> + struct intel_framebuffer base;
> + struct i915_panic_data panic;
> +};
> +
> +struct intel_framebuffer *i915_gem_object_alloc_framebuffer(void)
> +{
> + struct i915_framebuffer *i915_fb;
> +
> + i915_fb = kzalloc(sizeof(*i915_fb), GFP_KERNEL);
> + if (i915_fb)
> + return &i915_fb->base;
> + return NULL;
> +}
> +
> /* get, pin, and map the pages of the object into kernel space */
> void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
> enum i915_map_type type)
> diff --git a/drivers/gpu/drm/xe/display/intel_bo.c b/drivers/gpu/drm/xe/display/intel_bo.c
> index 27437c22bd70..926fcd9c86e1 100644
> --- a/drivers/gpu/drm/xe/display/intel_bo.c
> +++ b/drivers/gpu/drm/xe/display/intel_bo.c
> @@ -3,6 +3,8 @@
>
> #include <drm/drm_gem.h>
>
> +#include "intel_display_types.h"
> +
This file is also supposed to be an abstraction layer, and should not be
looking at intel framebuffer details.
*sad trombone*
Jocelyn, not your fault, it's our fault, and it's also a bunch more todo
items and refactoring for us. :(
BR;
Jani.
> #include "xe_bo.h"
> #include "intel_bo.h"
>
> @@ -59,3 +61,25 @@ void intel_bo_describe(struct seq_file *m, struct drm_gem_object *obj)
> {
> /* FIXME */
> }
> +
> +struct xe_panic_data {
> + struct page **pages;
> + int page;
> + void *vaddr;
> +};
> +
> +struct xe_framebuffer {
> + struct intel_framebuffer base;
> + struct xe_panic_data panic;
> +};
> +
> +struct intel_framebuffer *intel_bo_alloc_framebuffer(void)
> +{
> + struct xe_framebuffer *xe_fb;
> +
> + xe_fb = kzalloc(sizeof(*xe_fb), GFP_KERNEL);
> + if (xe_fb)
> + return &xe_fb->base;
> + return NULL;
> +}
> +
--
Jani Nikula, Intel
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