From: Tom St Denis <tom.stdenis@amd.com>
Date: Tue, 29 Aug 2017 08:36:52 -0400
Subject: 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
Git-commit: 08cab989f77582cb19df12d4a75a91b68b0017f6
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 42 +++++++++++++++++++++++++++++++-
1 file changed, 41 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1671,10 +1671,50 @@ static ssize_t amdgpu_ttm_vram_read(stru
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