diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.14.71/0878-drm-amd-amdgpu-Add-write-method-to-VRAM-debugfs-entr.patch')
-rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.14.71/0878-drm-amd-amdgpu-Add-write-method-to-VRAM-debugfs-entr.patch | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.14.71/0878-drm-amd-amdgpu-Add-write-method-to-VRAM-debugfs-entr.patch b/common/recipes-kernel/linux/linux-yocto-4.14.71/0878-drm-amd-amdgpu-Add-write-method-to-VRAM-debugfs-entr.patch new file mode 100644 index 00000000..e4e15e21 --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.14.71/0878-drm-amd-amdgpu-Add-write-method-to-VRAM-debugfs-entr.patch @@ -0,0 +1,80 @@ +From f203e0f5d119a7ebab00cbf837876cc475830ae6 Mon Sep 17 00:00:00 2001 +From: Tom St Denis <tom.stdenis@amd.com> +Date: Tue, 29 Aug 2017 08:36:52 -0400 +Subject: [PATCH 0878/4131] drm/amd/amdgpu: Add write() method to VRAM debugfs + entry (v2) +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Allows writing data to vram via debugfs. + +Signed-off-by: Tom St Denis <tom.stdenis@amd.com> +Reviewed-by: Christian König <christian.koenig@amd.com> + +(v2): Call get_user before holding spinlock. + +Signed-off-by: Alex Deucher <alexander.deucher@amd.com> +--- + drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 42 ++++++++++++++++++++++++++++++++- + 1 file changed, 41 insertions(+), 1 deletion(-) + +diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +index d2431cc..bbe7d2b 100644 +--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c ++++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +@@ -1914,10 +1914,50 @@ static ssize_t amdgpu_ttm_vram_read(struct file *f, char __user *buf, + return result; + } + ++static ssize_t amdgpu_ttm_vram_write(struct file *f, const char __user *buf, ++ size_t size, loff_t *pos) ++{ ++ struct amdgpu_device *adev = file_inode(f)->i_private; ++ ssize_t result = 0; ++ int r; ++ ++ if (size & 0x3 || *pos & 0x3) ++ return -EINVAL; ++ ++ if (*pos >= adev->mc.mc_vram_size) ++ return -ENXIO; ++ ++ while (size) { ++ unsigned long flags; ++ uint32_t value; ++ ++ if (*pos >= adev->mc.mc_vram_size) ++ return result; ++ ++ r = get_user(value, (uint32_t *)buf); ++ if (r) ++ return r; ++ ++ spin_lock_irqsave(&adev->mmio_idx_lock, flags); ++ WREG32(mmMM_INDEX, ((uint32_t)*pos) | 0x80000000); ++ WREG32(mmMM_INDEX_HI, *pos >> 31); ++ WREG32(mmMM_DATA, value); ++ spin_unlock_irqrestore(&adev->mmio_idx_lock, flags); ++ ++ result += 4; ++ buf += 4; ++ *pos += 4; ++ size -= 4; ++ } ++ ++ return result; ++} ++ + static const struct file_operations amdgpu_ttm_vram_fops = { + .owner = THIS_MODULE, + .read = amdgpu_ttm_vram_read, +- .llseek = default_llseek ++ .write = amdgpu_ttm_vram_write, ++ .llseek = default_llseek, + }; + + #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS +-- +2.7.4 + |