This is a note to let you know that I've just added the patch titled
drm/amd/amdgpu: Assign GART pages to AMD device mapping
to the 6.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amd-amdgpu-assign-gart-pages-to-amd-device-mapping.patch
and it can be found in the queue-6.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e7a8594cc2af920a905db15653c19c362d4ebd3f Mon Sep 17 00:00:00 2001
From: Tom St Denis <tom.stdenis@xxxxxxx>
Date: Wed, 17 Jan 2024 12:47:37 -0500
Subject: drm/amd/amdgpu: Assign GART pages to AMD device mapping
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
From: Tom St Denis <tom.stdenis@xxxxxxx>
commit e7a8594cc2af920a905db15653c19c362d4ebd3f upstream.
This allows kernel mapped pages like the PDB and PTB to be
read via the iomem debugfs when there is no vram in the system.
Signed-off-by: Tom St Denis <tom.stdenis@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 6.7.x
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
@@ -121,6 +121,7 @@ int amdgpu_gart_table_ram_alloc(struct a
struct amdgpu_bo_param bp;
dma_addr_t dma_addr;
struct page *p;
+ unsigned long x;
int ret;
if (adev->gart.bo != NULL)
@@ -130,6 +131,10 @@ int amdgpu_gart_table_ram_alloc(struct a
if (!p)
return -ENOMEM;
+ /* assign pages to this device */
+ for (x = 0; x < (1UL << order); x++)
+ p[x].mapping = adev->mman.bdev.dev_mapping;
+
/* If the hardware does not support UTCL2 snooping of the CPU caches
* then set_memory_wc() could be used as a workaround to mark the pages
* as write combine memory.
@@ -223,6 +228,7 @@ void amdgpu_gart_table_ram_free(struct a
unsigned int order = get_order(adev->gart.table_size);
struct sg_table *sg = adev->gart.bo->tbo.sg;
struct page *p;
+ unsigned long x;
int ret;
ret = amdgpu_bo_reserve(adev->gart.bo, false);
@@ -234,6 +240,8 @@ void amdgpu_gart_table_ram_free(struct a
sg_free_table(sg);
kfree(sg);
p = virt_to_page(adev->gart.ptr);
+ for (x = 0; x < (1UL << order); x++)
+ p[x].mapping = NULL;
__free_pages(p, order);
adev->gart.ptr = NULL;
Patches currently in stable-queue which might be from tom.stdenis@xxxxxxx are
queue-6.7/drm-amd-amdgpu-assign-gart-pages-to-amd-device-mapping.patch
