PCI: tegra: Do not allocate MSI target memory

	struct msi_controller chip;

	DECLARE_BITMAP(used, INT_PCI_MSI_NR);

	struct irq_domain *domain;

	unsigned long pages;

	struct mutex lock;

	u64 phys;

	int irq;

		goto err;

	}

	/* setup AFI/FPCI range */

	msi->pages = __get_free_pages(GFP_KERNEL, 0);

	msi->phys = virt_to_phys((void *)msi->pages);

	/*

	 * The PCI host bridge on Tegra contains some logic that intercepts

	 * MSI writes, which means that the MSI target address doesn't have

	 * to point to actual physical memory. Rather than allocating one 4

	 * KiB page of system memory that's never used, we can simply pick

	 * an arbitrary address within an area reserved for system memory

	 * in the FPCI address map.

	 *

	 * However, in order to avoid confusion, we pick an address that

	 * doesn't map to physical memory. The FPCI address map reserves a

	 * 1012 GiB region for system memory and memory-mapped I/O. Since

	 * none of the Tegra SoCs that contain this PCI host bridge can

	 * address more than 16 GiB of system memory, the last 4 KiB of

	 * these 1012 GiB is a good candidate.

	 */

	msi->phys = 0xfcfffff000;

	afi_writel(pcie, msi->phys >> soc->msi_base_shift, AFI_MSI_FPCI_BAR_ST);

	afi_writel(pcie, msi->phys, AFI_MSI_AXI_BAR_ST);

	afi_writel(pcie, 0, AFI_MSI_EN_VEC6);

	afi_writel(pcie, 0, AFI_MSI_EN_VEC7);

	free_pages(msi->pages, 0);

	if (msi->irq > 0)

		free_irq(msi->irq, pcie);