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Commit 08cab989 authored by Tom St Denis's avatar Tom St Denis Committed by Alex Deucher
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drm/amd/amdgpu: Add write() method to VRAM debugfs entry (v2) 



Allows writing data to vram via debugfs.

Signed-off-by: default avatarTom St Denis <tom.stdenis@amd.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>

(v2):  Call get_user before holding spinlock.

Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 841e3be1

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

+41 −1
Original line number Diff line number Diff line
@@ -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