[PATCH 5/6] ntb: Adding split BAR support for Haswell platforms

From: Dave Jiang
Date: Thu Aug 28 2014 - 16:53:55 EST

On the Haswell platform, a split BAR option to allow creation of 2
32bit BARs (4 and 5) from the 64bit BAR 4. Adding support for this
new option.

Signed-off-by: Dave Jiang <dave.jiang@xxxxxxxxx>
Signed-off-by: Jon Mason <jdmason@xxxxxxxxx>
---
drivers/ntb/ntb_hw.c | 217 ++++++++++++++++++++++++++++++++++++++----------
drivers/ntb/ntb_hw.h | 14 ++-
drivers/ntb/ntb_regs.h | 31 +++++--
3 files changed, 202 insertions(+), 60 deletions(-)

diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c
index 471c847..cef9d8a 100644
--- a/drivers/ntb/ntb_hw.c
+++ b/drivers/ntb/ntb_hw.c
@@ -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)},
@@ -506,8 +506,14 @@ 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:
- writeq(addr, ndev->reg_ofs.bar4_xlat);
+ 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
@@ -738,15 +747,16 @@ 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 +
- SNB_SPAD_OFFSET;
- ndev->reg_ofs.rdb = ndev->mw[1].vbase +
- SNB_PDOORBELL_OFFSET;
+ ndev->reg_ofs.spad_write =
+ ndev->mw[ndev->limits.max_mw - 1].vbase +
+ SNB_SPAD_OFFSET;
+ 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
* prevent an illegal access
@@ -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 +811,15 @@ 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 +
- SNB_PBAR4XLAT_OFFSET);
+ 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
*/
@@ -811,8 +833,14 @@ 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 +
- SNB_SBAR4BASE_OFFSET);
+ 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 +
SNB_PBAR2XLAT_OFFSET);
@@ -820,9 +848,17 @@ 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 +
- SNB_PBAR4XLAT_OFFSET);
- /* B2B_XLAT_OFFSET is a 64bit register, but can
+ if (ndev->split_bar) {
+ writel(SNB_MBAR4_USD_ADDR,
+ ndev->reg_base + SNB_PBAR4XLAT_OFFSET);
+ 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 +870,15 @@ 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 +
- SNB_SBAR4BASE_OFFSET);
+ 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:
@@ -865,7 +908,12 @@ 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;
- ndev->limits.max_mw = SNB_MAX_MW;
+ 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:
if (ndev->wa_flags & WA_SNB_ERR) {
@@ -892,7 +940,12 @@ 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;

- ndev->limits.max_mw = SNB_MAX_MW;
+ 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 +1552,10 @@ 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 +1572,25 @@ 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 +1604,8 @@ 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 +1624,25 @@ 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 +1720,50 @@ 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(sizeof(struct ntb_mw), ndev->limits.max_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));
- ndev->mw[i].vbase =
- ioremap_wc(pci_resource_start(pdev, MW_TO_BAR(i)),
- ndev->mw[i].bar_sz);
+
+ /*
+ * 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_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 +1778,7 @@ 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 +1787,22 @@ 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 +1814,29 @@ 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);
+err3:
+ if (ndev->split_bar)
+ pci_release_selected_regions(pdev, NTB_SPLITBAR_MASK);
+ else
+ pci_release_selected_regions(pdev, NTB_BAR_MASK);
err2:
- pci_release_selected_regions(pdev, NTB_BAR_MASK);
+ kfree(ndev->mw);
err1:
pci_disable_device(pdev);
err:
@@ -1745,11 +1860,19 @@ 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);
- pci_release_selected_regions(pdev, NTB_BAR_MASK);
+ 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);
kfree(ndev);
diff --git a/drivers/ntb/ntb_hw.h b/drivers/ntb/ntb_hw.h
index 5380ca1..96de5fc 100644
--- a/drivers/ntb/ntb_hw.h
+++ b/drivers/ntb/ntb_hw.h
@@ -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;
diff --git a/drivers/ntb/ntb_regs.h b/drivers/ntb/ntb_regs.h
index 0787205..f028ff8 100644
--- a/drivers/ntb/ntb_regs.h
+++ b/drivers/ntb/ntb_regs.h
@@ -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

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