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ntb: intel: add Intel NTB LTR vendor support for gen4 NTB

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Intel NTB device has custom LTR management that is not compliant with the
PCIe standard. Add support to set LTR status triggered by link status
change.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Dave Jiang 2020-11-23 08:36:12 -07:00 committed by Jon Mason
parent 91b8246de8
commit 75b6f6487c
3 changed files with 42 additions and 1 deletions
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1
drivers/ntb/hw/intel/ntb_hw_gen1.h
View File

@ -141,6 +141,7 @@
#define NTB_HWERR_B2BDOORBELL_BIT14 BIT_ULL(2)
#define NTB_HWERR_MSIX_VECTOR32_BAD BIT_ULL(3)
#define NTB_HWERR_BAR_ALIGN BIT_ULL(4)
#define NTB_HWERR_LTR_BAD BIT_ULL(5)
extern struct intel_b2b_addr xeon_b2b_usd_addr;
extern struct intel_b2b_addr xeon_b2b_dsd_addr;

27
drivers/ntb/hw/intel/ntb_hw_gen4.c
View File

@ -177,8 +177,10 @@ int gen4_init_dev(struct intel_ntb_dev *ndev)
ndev->reg = &gen4_reg;
if (pdev_is_ICX(pdev))
if (pdev_is_ICX(pdev)) {
ndev->hwerr_flags |= NTB_HWERR_BAR_ALIGN;
ndev->hwerr_flags |= NTB_HWERR_LTR_BAD;
}
ppd1 = ioread32(ndev->self_mmio + GEN4_PPD1_OFFSET);
ndev->ntb.topo = gen4_ppd_topo(ndev, ppd1);
@ -431,6 +433,25 @@ static int intel_ntb4_link_enable(struct ntb_dev *ntb,
dev_dbg(&ntb->pdev->dev,
"ignoring max_width %d\n", max_width);
if (!(ndev->hwerr_flags & NTB_HWERR_LTR_BAD)) {
u32 ltr;
/* Setup active snoop LTR values */
ltr = NTB_LTR_ACTIVE_REQMNT | NTB_LTR_ACTIVE_VAL | NTB_LTR_ACTIVE_LATSCALE;
/* Setup active non-snoop values */
ltr = (ltr << NTB_LTR_NS_SHIFT) | ltr;
iowrite32(ltr, ndev->self_mmio + GEN4_LTR_ACTIVE_OFFSET);
/* Setup idle snoop LTR values */
ltr = NTB_LTR_IDLE_VAL | NTB_LTR_IDLE_LATSCALE | NTB_LTR_IDLE_REQMNT;
/* Setup idle non-snoop values */
ltr = (ltr << NTB_LTR_NS_SHIFT) | ltr;
iowrite32(ltr, ndev->self_mmio + GEN4_LTR_IDLE_OFFSET);
/* setup PCIe LTR to active */
iowrite8(NTB_LTR_SWSEL_ACTIVE, ndev->self_mmio + GEN4_LTR_SWSEL_OFFSET);
}
ntb_ctl = NTB_CTL_E2I_BAR23_SNOOP | NTB_CTL_I2E_BAR23_SNOOP;
ntb_ctl |= NTB_CTL_E2I_BAR45_SNOOP | NTB_CTL_I2E_BAR45_SNOOP;
iowrite32(ntb_ctl, ndev->self_mmio + ndev->reg->ntb_ctl);
@ -476,6 +497,10 @@ static int intel_ntb4_link_disable(struct ntb_dev *ntb)
lnkctl |= GEN4_LINK_CTRL_LINK_DISABLE;
iowrite16(lnkctl, ndev->self_mmio + GEN4_LINK_CTRL_OFFSET);
/* set LTR to idle */
if (!(ndev->hwerr_flags & NTB_HWERR_LTR_BAD))
iowrite8(NTB_LTR_SWSEL_IDLE, ndev->self_mmio + GEN4_LTR_SWSEL_OFFSET);
ndev->dev_up = 0;
return 0;

15
drivers/ntb/hw/intel/ntb_hw_gen4.h
View File

@ -35,6 +35,9 @@
#define GEN4_IM_SPAD_SEM_OFFSET 0x00c0 /* SPAD hw semaphore */
#define GEN4_IM_SPAD_STICKY_OFFSET 0x00c4 /* sticky SPAD */
#define GEN4_IM_DOORBELL_OFFSET 0x0100 /* 0-31 doorbells */
#define GEN4_LTR_SWSEL_OFFSET 0x30ec
#define GEN4_LTR_ACTIVE_OFFSET 0x30f0
#define GEN4_LTR_IDLE_OFFSET 0x30f4
#define GEN4_EM_SPAD_OFFSET 0x8080
/* note, link status is now in MMIO and not config space for NTB */
#define GEN4_LINK_CTRL_OFFSET 0xb050
@ -80,6 +83,18 @@
#define NTB_SJC_FORCEDETECT 0x000004
#define NTB_LTR_SWSEL_ACTIVE 0x0
#define NTB_LTR_SWSEL_IDLE 0x1
#define NTB_LTR_NS_SHIFT 16
#define NTB_LTR_ACTIVE_VAL 0x0000 /* 0 us */
#define NTB_LTR_ACTIVE_LATSCALE 0x0800 /* 1us scale */
#define NTB_LTR_ACTIVE_REQMNT 0x8000 /* snoop req enable */
#define NTB_LTR_IDLE_VAL 0x0258 /* 600 us */
#define NTB_LTR_IDLE_LATSCALE 0x0800 /* 1us scale */
#define NTB_LTR_IDLE_REQMNT 0x8000 /* snoop req enable */
ssize_t ndev_ntb4_debugfs_read(struct file *filp, char __user *ubuf,
size_t count, loff_t *offp);
int gen4_init_dev(struct intel_ntb_dev *ndev);