ntb: Adding split BAR support for Haswell platforms (ab760a0c) · Commits · 方亚芬 / raspberrypi_linux

drivers/ntb/ntb_hw.c

+178 −47

Original line number	Diff line number	Diff line
		@@ -84,8 +84,8 @@ static struct dentry *debugfs_dir;

		#define BWD_LINK_RECOVERY_TIME 500

		/* Translate memory window 0,1 to BAR 2,4 */
		#define MW_TO_BAR(mw) (mw * NTB_MAX_NUM_MW + 2)
		/* Translate memory window 0,1,2 to BAR 2,4,5 */
		#define MW_TO_BAR(mw) (mw == 0 ? 2 : (mw == 1 ? 4 : 5))

		static const struct pci_device_id ntb_pci_tbl[] = {
		{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_BWD)},
		@@ -506,9 +506,15 @@ void ntb_set_mw_addr(struct ntb_device *ndev, unsigned int mw, u64 addr)
		case NTB_BAR_23:
		writeq(addr, ndev->reg_ofs.bar2_xlat);
		break;
		case NTB_BAR_45:
		case NTB_BAR_4:
		if (ndev->split_bar)
		writel(addr, ndev->reg_ofs.bar4_xlat);
		else
		writeq(addr, ndev->reg_ofs.bar4_xlat);
		break;
		case NTB_BAR_5:
		writel(addr, ndev->reg_ofs.bar5_xlat);
		break;
		}
		}

		@@ -729,6 +735,9 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
		ndev->reg_ofs.spad_read = ndev->reg_base + SNB_SPAD_OFFSET;
		ndev->reg_ofs.bar2_xlat = ndev->reg_base + SNB_SBAR2XLAT_OFFSET;
		ndev->reg_ofs.bar4_xlat = ndev->reg_base + SNB_SBAR4XLAT_OFFSET;
		if (ndev->split_bar)
		ndev->reg_ofs.bar5_xlat =
		ndev->reg_base + SNB_SBAR5XLAT_OFFSET;
		ndev->limits.max_spads = SNB_MAX_B2B_SPADS;

		/* There is a Xeon hardware errata related to writes to
		@@ -738,14 +747,15 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
		* scratch pad registers on the remote system.
		*/
		if (ndev->wa_flags & WA_SNB_ERR) {
		if (!ndev->mw[1].bar_sz)
		if (!ndev->mw[ndev->limits.max_mw - 1].bar_sz)
		return -EINVAL;

		ndev->limits.max_mw = SNB_ERRATA_MAX_MW;
		ndev->limits.max_db_bits = SNB_MAX_DB_BITS;
		ndev->reg_ofs.spad_write = ndev->mw[1].vbase +
		ndev->reg_ofs.spad_write =
		ndev->mw[ndev->limits.max_mw - 1].vbase +
		SNB_SPAD_OFFSET;
		ndev->reg_ofs.rdb = ndev->mw[1].vbase +
		ndev->reg_ofs.rdb =
		ndev->mw[ndev->limits.max_mw - 1].vbase +
		SNB_PDOORBELL_OFFSET;

		/* Set the Limit register to 4k, the minimum size, to
		@@ -759,9 +769,9 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
		* the driver defaults, but write the Limit registers
		* first just in case.
		*/
		} else {
		ndev->limits.max_mw = SNB_MAX_MW;

		ndev->limits.max_mw = SNB_ERRATA_MAX_MW;
		} else {
		/* HW Errata on bit 14 of b2bdoorbell register. Writes
		* will not be mirrored to the remote system. Shrink
		* the number of bits by one, since bit 14 is the last
		@@ -774,7 +784,8 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
		SNB_B2B_DOORBELL_OFFSET;

		/* Disable the Limit register, just incase it is set to
		* something silly
		* something silly. A 64bit write should handle it
		* regardless of whether it has a split BAR or not.
		*/
		writeq(0, ndev->reg_base + SNB_PBAR4LMT_OFFSET);
		/* HW errata on the Limit registers. They can only be
		@@ -783,6 +794,10 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
		* the driver defaults, but write the Limit registers
		* first just in case.
		*/
		if (ndev->split_bar)
		ndev->limits.max_mw = HSX_SPLITBAR_MAX_MW;
		else
		ndev->limits.max_mw = SNB_MAX_MW;
		}

		/* The Xeon errata workaround requires setting SBAR Base
		@@ -796,8 +811,18 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
		writeq(SNB_MBAR01_DSD_ADDR, ndev->reg_base +
		SNB_PBAR4XLAT_OFFSET);
		else {
		writeq(SNB_MBAR45_DSD_ADDR, ndev->reg_base +
		if (ndev->split_bar) {
		writel(SNB_MBAR4_DSD_ADDR,
		ndev->reg_base +
		SNB_PBAR4XLAT_OFFSET);
		writel(SNB_MBAR5_DSD_ADDR,
		ndev->reg_base +
		SNB_PBAR5XLAT_OFFSET);
		} else
		writeq(SNB_MBAR4_DSD_ADDR,
		ndev->reg_base +
		SNB_PBAR4XLAT_OFFSET);

		/* B2B_XLAT_OFFSET is a 64bit register, but can
		* only take 32bit writes
		*/
		@@ -811,7 +836,13 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
		SNB_SBAR0BASE_OFFSET);
		writeq(SNB_MBAR23_USD_ADDR, ndev->reg_base +
		SNB_SBAR2BASE_OFFSET);
		writeq(SNB_MBAR45_USD_ADDR, ndev->reg_base +
		if (ndev->split_bar) {
		writel(SNB_MBAR4_USD_ADDR, ndev->reg_base +
		SNB_SBAR4BASE_OFFSET);
		writel(SNB_MBAR5_USD_ADDR, ndev->reg_base +
		SNB_SBAR5BASE_OFFSET);
		} else
		writeq(SNB_MBAR4_USD_ADDR, ndev->reg_base +
		SNB_SBAR4BASE_OFFSET);
		} else {
		writeq(SNB_MBAR23_USD_ADDR, ndev->reg_base +
		@@ -820,9 +851,20 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
		writeq(SNB_MBAR01_USD_ADDR, ndev->reg_base +
		SNB_PBAR4XLAT_OFFSET);
		else {
		writeq(SNB_MBAR45_USD_ADDR, ndev->reg_base +
		if (ndev->split_bar) {
		writel(SNB_MBAR4_USD_ADDR,
		ndev->reg_base +
		SNB_PBAR4XLAT_OFFSET);
		/* B2B_XLAT_OFFSET is a 64bit register, but can
		writel(SNB_MBAR5_USD_ADDR,
		ndev->reg_base +
		SNB_PBAR5XLAT_OFFSET);
		} else
		writeq(SNB_MBAR4_USD_ADDR,
		ndev->reg_base +
		SNB_PBAR4XLAT_OFFSET);

		/*
		* B2B_XLAT_OFFSET is a 64bit register, but can
		* only take 32bit writes
		*/
		writel(SNB_MBAR01_USD_ADDR & 0xffffffff,
		@@ -834,8 +876,15 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
		SNB_SBAR0BASE_OFFSET);
		writeq(SNB_MBAR23_DSD_ADDR, ndev->reg_base +
		SNB_SBAR2BASE_OFFSET);
		writeq(SNB_MBAR45_DSD_ADDR, ndev->reg_base +
		if (ndev->split_bar) {
		writel(SNB_MBAR4_DSD_ADDR, ndev->reg_base +
		SNB_SBAR4BASE_OFFSET);
		writel(SNB_MBAR5_DSD_ADDR, ndev->reg_base +
		SNB_SBAR5BASE_OFFSET);
		} else
		writeq(SNB_MBAR4_DSD_ADDR, ndev->reg_base +
		SNB_SBAR4BASE_OFFSET);

		}
		break;
		case NTB_CONN_RP:
		@@ -865,6 +914,11 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
		ndev->reg_ofs.spad_read = ndev->reg_base + SNB_SPAD_OFFSET;
		ndev->reg_ofs.bar2_xlat = ndev->reg_base + SNB_SBAR2XLAT_OFFSET;
		ndev->reg_ofs.bar4_xlat = ndev->reg_base + SNB_SBAR4XLAT_OFFSET;
		if (ndev->split_bar) {
		ndev->reg_ofs.bar5_xlat =
		ndev->reg_base + SNB_SBAR5XLAT_OFFSET;
		ndev->limits.max_mw = HSX_SPLITBAR_MAX_MW;
		} else
		ndev->limits.max_mw = SNB_MAX_MW;
		break;
		case NTB_CONN_TRANSPARENT:
		@@ -892,6 +946,11 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
		ndev->reg_ofs.bar2_xlat = ndev->reg_base + SNB_PBAR2XLAT_OFFSET;
		ndev->reg_ofs.bar4_xlat = ndev->reg_base + SNB_PBAR4XLAT_OFFSET;

		if (ndev->split_bar) {
		ndev->reg_ofs.bar5_xlat =
		ndev->reg_base + SNB_PBAR5XLAT_OFFSET;
		ndev->limits.max_mw = HSX_SPLITBAR_MAX_MW;
		} else
		ndev->limits.max_mw = SNB_MAX_MW;
		break;
		default:
		@@ -1499,7 +1558,11 @@ static void ntb_hw_link_up(struct ntb_device *ndev)
		ntb_cntl = readl(ndev->reg_ofs.lnk_cntl);
		ntb_cntl &= ~(NTB_CNTL_LINK_DISABLE \| NTB_CNTL_CFG_LOCK);
		ntb_cntl \|= NTB_CNTL_P2S_BAR23_SNOOP \| NTB_CNTL_S2P_BAR23_SNOOP;
		ntb_cntl \|= NTB_CNTL_P2S_BAR45_SNOOP \| NTB_CNTL_S2P_BAR45_SNOOP;
		ntb_cntl \|= NTB_CNTL_P2S_BAR4_SNOOP \| NTB_CNTL_S2P_BAR4_SNOOP;
		if (ndev->split_bar)
		ntb_cntl \|= NTB_CNTL_P2S_BAR5_SNOOP \|
		NTB_CNTL_S2P_BAR5_SNOOP;

		writel(ntb_cntl, ndev->reg_ofs.lnk_cntl);
		}
		}
		@@ -1516,14 +1579,26 @@ static void ntb_hw_link_down(struct ntb_device *ndev)
		/* Bring NTB link down */
		ntb_cntl = readl(ndev->reg_ofs.lnk_cntl);
		ntb_cntl &= ~(NTB_CNTL_P2S_BAR23_SNOOP \| NTB_CNTL_S2P_BAR23_SNOOP);
		ntb_cntl &= ~(NTB_CNTL_P2S_BAR45_SNOOP \| NTB_CNTL_S2P_BAR45_SNOOP);
		ntb_cntl &= ~(NTB_CNTL_P2S_BAR4_SNOOP \| NTB_CNTL_S2P_BAR4_SNOOP);
		if (ndev->split_bar)
		ntb_cntl &= ~(NTB_CNTL_P2S_BAR5_SNOOP \|
		NTB_CNTL_S2P_BAR5_SNOOP);
		ntb_cntl \|= NTB_CNTL_LINK_DISABLE \| NTB_CNTL_CFG_LOCK;
		writel(ntb_cntl, ndev->reg_ofs.lnk_cntl);
		}

		static void ntb_max_mw_detect(struct ntb_device *ndev)
		{
		if (ndev->split_bar)
		ndev->limits.max_mw = HSX_SPLITBAR_MAX_MW;
		else
		ndev->limits.max_mw = SNB_MAX_MW;
		}

		static int ntb_xeon_detect(struct ntb_device *ndev)
		{
		int rc;
		int rc, bars_mask;
		u32 bars;
		u8 ppd;

		ndev->hw_type = SNB_HW;
		@@ -1537,6 +1612,8 @@ static int ntb_xeon_detect(struct ntb_device *ndev)
		else
		ndev->dev_type = NTB_DEV_DSD;

		ndev->split_bar = (ppd & SNB_PPD_SPLIT_BAR) ? 1 : 0;

		switch (ppd & SNB_PPD_CONN_TYPE) {
		case NTB_CONN_B2B:
		dev_info(&ndev->pdev->dev, "Conn Type = B2B\n");
		@@ -1555,12 +1632,25 @@ static int ntb_xeon_detect(struct ntb_device *ndev)
		* NTB. We will just force correct here.
		*/
		ndev->dev_type = NTB_DEV_USD;

		/*
		* This is a way for transparent BAR to figure out if we
		* are doing split BAR or not. There is no way for the hw
		* on the transparent side to know and set the PPD.
		*/
		bars_mask = pci_select_bars(ndev->pdev, IORESOURCE_MEM);
		bars = hweight32(bars_mask);
		if (bars == (HSX_SPLITBAR_MAX_MW + 1))
		ndev->split_bar = 1;

		break;
		default:
		dev_err(&ndev->pdev->dev, "Unknown PPD %x\n", ppd);
		return -ENODEV;
		}

		ntb_max_mw_detect(ndev);

		return 0;
		}

		@@ -1638,22 +1728,50 @@ static int ntb_pci_probe(struct pci_dev pdev, const struct pci_device_id id)
		if (rc)
		goto err;

		rc = pci_request_selected_regions(pdev, NTB_BAR_MASK, KBUILD_MODNAME);
		if (rc)
		ndev->mw = kcalloc(ndev->limits.max_mw, sizeof(struct ntb_mw),
		GFP_KERNEL);
		if (!ndev->mw) {
		rc = -ENOMEM;
		goto err1;
		}

		if (ndev->split_bar)
		rc = pci_request_selected_regions(pdev, NTB_SPLITBAR_MASK,
		KBUILD_MODNAME);
		else
		rc = pci_request_selected_regions(pdev, NTB_BAR_MASK,
		KBUILD_MODNAME);

		if (rc)
		goto err2;

		ndev->reg_base = pci_ioremap_bar(pdev, NTB_BAR_MMIO);
		if (!ndev->reg_base) {
		dev_warn(&pdev->dev, "Cannot remap BAR 0\n");
		rc = -EIO;
		goto err2;
		goto err3;
		}

		for (i = 0; i < NTB_MAX_NUM_MW; i++) {
		for (i = 0; i < ndev->limits.max_mw; i++) {
		ndev->mw[i].bar_sz = pci_resource_len(pdev, MW_TO_BAR(i));

		/*
		* with the errata we need to steal last of the memory
		* windows for workarounds and they point to MMIO registers.
		*/
		if ((ndev->wa_flags & WA_SNB_ERR) &&
		(i == (ndev->limits.max_mw - 1))) {
		ndev->mw[i].vbase =
		ioremap_wc(pci_resource_start(pdev, MW_TO_BAR(i)),
		ioremap_nocache(pci_resource_start(pdev,
		MW_TO_BAR(i)),
		ndev->mw[i].bar_sz);
		} else {
		ndev->mw[i].vbase =
		ioremap_wc(pci_resource_start(pdev,
		MW_TO_BAR(i)),
		ndev->mw[i].bar_sz);
		}

		dev_info(&pdev->dev, "MW %d size %llu\n", i,
		(unsigned long long) ndev->mw[i].bar_sz);
		if (!ndev->mw[i].vbase) {
		@@ -1668,7 +1786,7 @@ static int ntb_pci_probe(struct pci_dev pdev, const struct pci_device_id id)
		if (rc) {
		rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
		if (rc)
		goto err3;
		goto err4;

		dev_warn(&pdev->dev, "Cannot DMA highmem\n");
		}
		@@ -1677,22 +1795,22 @@ static int ntb_pci_probe(struct pci_dev pdev, const struct pci_device_id id)
		if (rc) {
		rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
		if (rc)
		goto err3;
		goto err4;

		dev_warn(&pdev->dev, "Cannot DMA consistent highmem\n");
		}

		rc = ntb_device_setup(ndev);
		if (rc)
		goto err3;
		goto err4;

		rc = ntb_create_callbacks(ndev);
		if (rc)
		goto err4;
		goto err5;

		rc = ntb_setup_interrupts(ndev);
		if (rc)
		goto err5;
		goto err6;

		/* The scratchpad registers keep the values between rmmod/insmod,
		* blast them now
		@@ -1704,24 +1822,29 @@ static int ntb_pci_probe(struct pci_dev pdev, const struct pci_device_id id)

		rc = ntb_transport_init(pdev);
		if (rc)
		goto err6;
		goto err7;

		ntb_hw_link_up(ndev);

		return 0;

		err6:
		err7:
		ntb_free_interrupts(ndev);
		err5:
		err6:
		ntb_free_callbacks(ndev);
		err4:
		err5:
		ntb_device_free(ndev);
		err3:
		err4:
		for (i--; i >= 0; i--)
		iounmap(ndev->mw[i].vbase);
		iounmap(ndev->reg_base);
		err2:
		err3:
		if (ndev->split_bar)
		pci_release_selected_regions(pdev, NTB_SPLITBAR_MASK);
		else
		pci_release_selected_regions(pdev, NTB_BAR_MASK);
		err2:
		kfree(ndev->mw);
		err1:
		pci_disable_device(pdev);
		err:
		@@ -1745,10 +1868,18 @@ static void ntb_pci_remove(struct pci_dev *pdev)
		ntb_free_callbacks(ndev);
		ntb_device_free(ndev);

		for (i = 0; i < NTB_MAX_NUM_MW; i++)
		/* need to reset max_mw limits so we can unmap properly */
		if (ndev->hw_type == SNB_HW)
		ntb_max_mw_detect(ndev);

		for (i = 0; i < ndev->limits.max_mw; i++)
		iounmap(ndev->mw[i].vbase);

		kfree(ndev->mw);
		iounmap(ndev->reg_base);
		if (ndev->split_bar)
		pci_release_selected_regions(pdev, NTB_SPLITBAR_MASK);
		else
		pci_release_selected_regions(pdev, NTB_BAR_MASK);
		pci_disable_device(pdev);
		ntb_free_debugfs(ndev);

drivers/ntb/ntb_hw.h

+9 −5

Original line number	Diff line number	Diff line
		@@ -78,14 +78,16 @@ static inline void writeq(u64 val, void __iomem *addr)

		#define NTB_BAR_MMIO 0
		#define NTB_BAR_23 2
		#define NTB_BAR_45 4
		#define NTB_BAR_4 4
		#define NTB_BAR_5 5

		#define NTB_BAR_MASK ((1 << NTB_BAR_MMIO) \| (1 << NTB_BAR_23) \|\
		(1 << NTB_BAR_45))
		(1 << NTB_BAR_4))
		#define NTB_SPLITBAR_MASK ((1 << NTB_BAR_MMIO) \| (1 << NTB_BAR_23) \|\
		(1 << NTB_BAR_4) \| (1 << NTB_BAR_5))

		#define NTB_HB_TIMEOUT msecs_to_jiffies(1000)

		#define NTB_MAX_NUM_MW 2

		enum ntb_hw_event {
		NTB_EVENT_SW_EVENT0 = 0,
		NTB_EVENT_SW_EVENT1,
		@@ -115,7 +117,7 @@ struct ntb_device {
		struct pci_dev *pdev;
		struct msix_entry *msix_entries;
		void __iomem *reg_base;
		struct ntb_mw mw[NTB_MAX_NUM_MW];
		struct ntb_mw *mw;
		struct {
		unsigned char max_mw;
		unsigned char max_spads;
		@@ -128,6 +130,7 @@ struct ntb_device {
		void __iomem *rdb;
		void __iomem *bar2_xlat;
		void __iomem *bar4_xlat;
		void __iomem *bar5_xlat;
		void __iomem *spad_write;
		void __iomem *spad_read;
		void __iomem *lnk_cntl;
		@@ -147,6 +150,7 @@ struct ntb_device {
		unsigned char link_width;
		unsigned char link_speed;
		unsigned char link_status;
		unsigned char split_bar;

		struct delayed_work hb_timer;
		unsigned long last_ts;

drivers/ntb/ntb_regs.h

+23 −8

Original line number	Diff line number	Diff line
		@@ -57,6 +57,7 @@
		#define SNB_MAX_DB_BITS 15
		#define SNB_LINK_DB 15
		#define SNB_DB_BITS_PER_VEC 5
		#define HSX_SPLITBAR_MAX_MW 3
		#define SNB_MAX_MW 2
		#define SNB_ERRATA_MAX_MW 1

		@@ -72,15 +73,20 @@

		#define SNB_PBAR2LMT_OFFSET 0x0000
		#define SNB_PBAR4LMT_OFFSET 0x0008
		#define SNB_PBAR5LMT_OFFSET 0x000C
		#define SNB_PBAR2XLAT_OFFSET 0x0010
		#define SNB_PBAR4XLAT_OFFSET 0x0018
		#define SNB_PBAR5XLAT_OFFSET 0x001C
		#define SNB_SBAR2LMT_OFFSET 0x0020
		#define SNB_SBAR4LMT_OFFSET 0x0028
		#define SNB_SBAR5LMT_OFFSET 0x002C
		#define SNB_SBAR2XLAT_OFFSET 0x0030
		#define SNB_SBAR4XLAT_OFFSET 0x0038
		#define SNB_SBAR5XLAT_OFFSET 0x003C
		#define SNB_SBAR0BASE_OFFSET 0x0040
		#define SNB_SBAR2BASE_OFFSET 0x0048
		#define SNB_SBAR4BASE_OFFSET 0x0050
		#define SNB_SBAR5BASE_OFFSET 0x0054
		#define SNB_NTBCNTL_OFFSET 0x0058
		#define SNB_SBDF_OFFSET 0x005C
		#define SNB_PDOORBELL_OFFSET 0x0060
		@@ -96,12 +102,18 @@
		#define SNB_B2B_XLAT_OFFSETL 0x0144
		#define SNB_B2B_XLAT_OFFSETU 0x0148

		#define SNB_MBAR01_USD_ADDR 0x000000210000000CULL
		#define SNB_MBAR23_USD_ADDR 0x000000410000000CULL
		#define SNB_MBAR45_USD_ADDR 0x000000810000000CULL
		#define SNB_MBAR01_DSD_ADDR 0x000000200000000CULL
		#define SNB_MBAR23_DSD_ADDR 0x000000400000000CULL
		#define SNB_MBAR45_DSD_ADDR 0x000000800000000CULL
		/*
		* The addresses are setup so the 32bit BARs can function. Thus
		* the addresses are all in 32bit space
		*/
		#define SNB_MBAR01_USD_ADDR 0x000000002100000CULL
		#define SNB_MBAR23_USD_ADDR 0x000000004100000CULL
		#define SNB_MBAR4_USD_ADDR 0x000000008100000CULL
		#define SNB_MBAR5_USD_ADDR 0x00000000A100000CULL
		#define SNB_MBAR01_DSD_ADDR 0x000000002000000CULL
		#define SNB_MBAR23_DSD_ADDR 0x000000004000000CULL
		#define SNB_MBAR4_DSD_ADDR 0x000000008000000CULL
		#define SNB_MBAR5_DSD_ADDR 0x00000000A000000CULL

		#define BWD_MSIX_CNT 34
		#define BWD_MAX_SPADS 16
		@@ -150,13 +162,16 @@
		#define NTB_CNTL_LINK_DISABLE (1 << 1)
		#define NTB_CNTL_S2P_BAR23_SNOOP (1 << 2)
		#define NTB_CNTL_P2S_BAR23_SNOOP (1 << 4)
		#define NTB_CNTL_S2P_BAR45_SNOOP (1 << 6)
		#define NTB_CNTL_P2S_BAR45_SNOOP (1 << 8)
		#define NTB_CNTL_S2P_BAR4_SNOOP (1 << 6)
		#define NTB_CNTL_P2S_BAR4_SNOOP (1 << 8)
		#define NTB_CNTL_S2P_BAR5_SNOOP (1 << 12)
		#define NTB_CNTL_P2S_BAR5_SNOOP (1 << 14)
		#define BWD_CNTL_LINK_DOWN (1 << 16)

		#define NTB_PPD_OFFSET 0x00D4
		#define SNB_PPD_CONN_TYPE 0x0003
		#define SNB_PPD_DEV_TYPE 0x0010
		#define SNB_PPD_SPLIT_BAR (1 << 6)
		#define BWD_PPD_INIT_LINK 0x0008
		#define BWD_PPD_CONN_TYPE 0x0300
		#define BWD_PPD_DEV_TYPE 0x1000