drivers/gpu/drm/vmwgfx/vmwgfx_devcaps.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/vmwgfx/vmwgfx_devcaps.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/vmwgfx/vmwgfx_devcaps.c
Extension
.c
Size
4299 bytes
Lines
144
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct svga_3d_compat_cap {
	SVGA3dFifoCapsRecordHeader header;
	SVGA3dFifoCapPair pairs[SVGA3D_DEVCAP_MAX];
};


static u32 vmw_mask_legacy_multisample(unsigned int cap, u32 fmt_value)
{
	/*
	 * A version of user-space exists which use MULTISAMPLE_MASKABLESAMPLES
	 * to check the sample count supported by virtual device. Since there
	 * never was support for multisample count for backing MOB return 0.
	 *
	 * MULTISAMPLE_MASKABLESAMPLES devcap is marked as deprecated by virtual
	 * device.
	 */
	if (cap == SVGA3D_DEVCAP_DEAD5)
		return 0;

	return fmt_value;
}

static int vmw_fill_compat_cap(struct vmw_private *dev_priv, void *bounce,
			       size_t size)
{
	struct svga_3d_compat_cap *compat_cap =
		(struct svga_3d_compat_cap *) bounce;
	unsigned int i;
	size_t pair_offset = offsetof(struct svga_3d_compat_cap, pairs);
	unsigned int max_size;

	if (size < pair_offset)
		return -EINVAL;

	max_size = (size - pair_offset) / sizeof(SVGA3dFifoCapPair);

	if (max_size > SVGA3D_DEVCAP_MAX)
		max_size = SVGA3D_DEVCAP_MAX;

	compat_cap->header.length =
		(pair_offset + max_size * sizeof(SVGA3dFifoCapPair)) / sizeof(u32);
	compat_cap->header.type = SVGA3D_FIFO_CAPS_RECORD_DEVCAPS;

	for (i = 0; i < max_size; ++i) {
		compat_cap->pairs[i][0] = i;
		compat_cap->pairs[i][1] = vmw_mask_legacy_multisample
			(i, dev_priv->devcaps[i]);
	}

	return 0;
}

int vmw_devcaps_create(struct vmw_private *vmw)
{
	bool gb_objects = !!(vmw->capabilities & SVGA_CAP_GBOBJECTS);
	uint32_t i;

	if (gb_objects) {
		vmw->devcaps = vzalloc(sizeof(uint32_t) * SVGA3D_DEVCAP_MAX);
		if (!vmw->devcaps)
			return -ENOMEM;
		for (i = 0; i < SVGA3D_DEVCAP_MAX; ++i) {
			vmw_write(vmw, SVGA_REG_DEV_CAP, i);
			vmw->devcaps[i] = vmw_read(vmw, SVGA_REG_DEV_CAP);
		}
	}
	return 0;
}

void vmw_devcaps_destroy(struct vmw_private *vmw)
{
	vfree(vmw->devcaps);
	vmw->devcaps = NULL;
}


uint32 vmw_devcaps_size(const struct vmw_private *vmw,
			bool gb_aware)
{
	bool gb_objects = !!(vmw->capabilities & SVGA_CAP_GBOBJECTS);
	if (gb_objects && gb_aware)
		return SVGA3D_DEVCAP_MAX * sizeof(uint32_t);
	else if (gb_objects)
		return  sizeof(struct svga_3d_compat_cap) +
				sizeof(uint32_t);
	else if (vmw->fifo_mem != NULL)
		return (SVGA_FIFO_3D_CAPS_LAST - SVGA_FIFO_3D_CAPS + 1) *
				sizeof(uint32_t);
	else
		return 0;

Annotation

Implementation Notes