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drm/amd/amdgpu: Add write() method to VRAM debugfs entry (v2)

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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>
This commit is contained in:
Tom St Denis 2017-08-29 08:36:52 -04:00 • committed by Alex Deucher
parent 841e3be124
commit 08cab989f7
1 changed files with 41 additions and 1 deletions
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42
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
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@ -1671,10 +1671,50 @@ 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