Exemplo n.º 1
0
static void __devexit ioat_remove(struct pci_dev *pdev)
{
	struct ioatdma_device *device = pci_get_drvdata(pdev);

	if (!device)
		return;

	dev_err(&pdev->dev, "Removing dma and dca services\n");
	if (device->dca) {
		unregister_dca_provider(device->dca, &pdev->dev);
		free_dca_provider(device->dca);
		device->dca = NULL;
	}
	ioat_dma_remove(device);
}
struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase)
{
	struct dca_provider *dca;
	struct ioat_dca_priv *ioatdca;
	int slots;
	int i;
	int err;
	u16 dca_offset;
	u16 csi_fsb_control;
	u16 pcie_control;
	u8 bit;

	union {
		u64 full;
		struct {
			u32 low;
			u32 high;
		};
	} tag_map;

	if (!system_has_dca_enabled(pdev))
		return NULL;

	dca_offset = readw(iobase + IOAT_DCAOFFSET_OFFSET);
	if (dca_offset == 0)
		return NULL;

	slots = ioat_dca_count_dca_slots(iobase, dca_offset);
	if (slots == 0)
		return NULL;

	dca = alloc_dca_provider(&ioat_dca_ops,
				 sizeof(*ioatdca)
				      + (sizeof(struct ioat_dca_slot) * slots));
	if (!dca)
		return NULL;

	ioatdca = dca_priv(dca);
	ioatdca->iobase = iobase;
	ioatdca->dca_base = iobase + dca_offset;
	ioatdca->max_requesters = slots;

	/* some bios might not know to turn these on */
	csi_fsb_control = readw(ioatdca->dca_base + IOAT3_CSI_CONTROL_OFFSET);
	if ((csi_fsb_control & IOAT3_CSI_CONTROL_PREFETCH) == 0) {
		csi_fsb_control |= IOAT3_CSI_CONTROL_PREFETCH;
		writew(csi_fsb_control,
		       ioatdca->dca_base + IOAT3_CSI_CONTROL_OFFSET);
	}
	pcie_control = readw(ioatdca->dca_base + IOAT3_PCI_CONTROL_OFFSET);
	if ((pcie_control & IOAT3_PCI_CONTROL_MEMWR) == 0) {
		pcie_control |= IOAT3_PCI_CONTROL_MEMWR;
		writew(pcie_control,
		       ioatdca->dca_base + IOAT3_PCI_CONTROL_OFFSET);
	}


	/* TODO version, compatibility and configuration checks */

	/* copy out the APIC to DCA tag map */
	tag_map.low =
		readl(ioatdca->dca_base + IOAT3_APICID_TAG_MAP_OFFSET_LOW);
	tag_map.high =
		readl(ioatdca->dca_base + IOAT3_APICID_TAG_MAP_OFFSET_HIGH);
	for (i = 0; i < 8; i++) {
		bit = tag_map.full >> (8 * i);
		ioatdca->tag_map[i] = bit & DCA_TAG_MAP_MASK;
	}

	if (dca3_tag_map_invalid(ioatdca->tag_map)) {
		WARN_TAINT_ONCE(1, TAINT_FIRMWARE_WORKAROUND,
				"%s %s: APICID_TAG_MAP set incorrectly by BIOS, disabling DCA\n",
				dev_driver_string(&pdev->dev),
				dev_name(&pdev->dev));
		free_dca_provider(dca);
		return NULL;
	}

	err = register_dca_provider(dca, &pdev->dev);
	if (err) {
		free_dca_provider(dca);
		return NULL;
	}

	return dca;
}