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NTB driver bug fixes to address issues in NTB-RP enablement, spad, 

debugfs, and USD/DSD identification.  Add a workaround on Xeon NTB
 devices for b2bdoorbell errata.  Also, add new NTB driver features to
 support 32bit x86, DMA engine support, and NTB-RP support.  Finally, a
 few clean-ups and update to MAINTAINERS for the NTB git tree and wiki
 location.
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Merge tag 'ntb-3.12' of git://github.com/jonmason/ntb

Pull NTB (non-transparent bridge) updates from Jon Mason:
 "NTB driver bug fixes to address issues in NTB-RP enablement, spad,
  debugfs, and USD/DSD identification.

  Add a workaround on Xeon NTB devices for b2bdoorbell errata.  Also,
  add new NTB driver features to support 32bit x86, DMA engine support,
  and NTB-RP support.

  Finally, a few clean-ups and update to MAINTAINERS for the NTB git
  tree and wiki location"

* tag 'ntb-3.12' of git://github.com/jonmason/ntb:
  ntb: clean up unnecessary MSI/MSI-X capability find
  MAINTAINERS: Add Website and Git Tree for NTB
  NTB: Update Version
  NTB: Comment Fix
  NTB: Remove unused variable
  NTB: Remove References of non-B2B BWD HW
  NTB: NTB-RP support
  NTB: Rename Variables for NTB-RP
  NTB: Use DMA Engine to Transmit and Receive
  NTB: Enable 32bit Support
  NTB: Update Device IDs
  NTB: BWD Link Recovery
  NTB: Xeon Errata Workaround
  NTB: Correct debugfs to work with more than 1 NTB Device
  NTB: Correct USD/DSD Identification
  NTB: Correct Number of Scratch Pad Registers
  NTB: Add Error Handling in ntb_device_setup
hifive-unleashed-5.1
Linus Torvalds 2013-09-07 20:17:44 -07:00
parent 8de4651abe 73f47cadfe
commit c4c1725228
6 changed files with 858 additions and 230 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
MAINTAINERS
View File

@ -5889,6 +5889,8 @@ F: drivers/scsi/nsp32*
NTB DRIVER
M: Jon Mason <jon.mason@intel.com>
S: Supported
W: https://github.com/jonmason/ntb/wiki
T: git git://github.com/jonmason/ntb.git
F: drivers/ntb/
F: drivers/net/ntb_netdev.c
F: include/linux/ntb.h

2
drivers/ntb/Kconfig
View File

@ -1,7 +1,7 @@
config NTB
tristate "Intel Non-Transparent Bridge support"
depends on PCI
depends on X86_64
depends on X86
help
The PCI-E Non-transparent bridge hardware is a point-to-point PCI-E bus
connecting 2 systems. When configured, writes to the device's PCI

501
drivers/ntb/ntb_hw.c
View File

@ -46,24 +46,30 @@
* Jon Mason <jon.mason@intel.com>
*/
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/random.h>
#include <linux/slab.h>
#include "ntb_hw.h"
#include "ntb_regs.h"
#define NTB_NAME "Intel(R) PCI-E Non-Transparent Bridge Driver"
#define NTB_VER "0.25"
#define NTB_VER "1.0"
MODULE_DESCRIPTION(NTB_NAME);
MODULE_VERSION(NTB_VER);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Intel Corporation");
static bool xeon_errata_workaround = true;
module_param(xeon_errata_workaround, bool, 0644);
MODULE_PARM_DESC(xeon_errata_workaround, "Workaround for the Xeon Errata");
enum {
NTB_CONN_CLASSIC = 0,
NTB_CONN_TRANSPARENT = 0,
NTB_CONN_B2B,
NTB_CONN_RP,
};
@ -78,17 +84,27 @@ enum {
BWD_HW,
};
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 * 2 + 2)
#define MW_TO_BAR(mw) (mw * NTB_MAX_NUM_MW + 2)
static DEFINE_PCI_DEVICE_TABLE(ntb_pci_tbl) = {
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_BWD)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_JSF)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_CLASSIC_JSF)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_RP_JSF)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_RP_SNB)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_SNB)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_CLASSIC_SNB)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_IVT)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_HSX)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_JSF)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_SNB)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_IVT)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_HSX)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_JSF)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_SNB)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_IVT)},
{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_HSX)},
{0}
};
MODULE_DEVICE_TABLE(pci, ntb_pci_tbl);
@ -129,6 +145,7 @@ void ntb_unregister_event_callback(struct ntb_device *ndev)
* ntb_register_db_callback() - register a callback for doorbell interrupt
* @ndev: pointer to ntb_device instance
* @idx: doorbell index to register callback, zero based
* @data: pointer to be returned to caller with every callback
* @func: callback function to register
*
* This function registers a callback function for the doorbell interrupt
@ -151,9 +168,9 @@ int ntb_register_db_callback(struct ntb_device *ndev, unsigned int idx,
ndev->db_cb[idx].data = data;
/* unmask interrupt */
mask = readw(ndev->reg_ofs.pdb_mask);
mask = readw(ndev->reg_ofs.ldb_mask);
clear_bit(idx * ndev->bits_per_vector, &mask);
writew(mask, ndev->reg_ofs.pdb_mask);
writew(mask, ndev->reg_ofs.ldb_mask);
return 0;
}
@ -173,9 +190,9 @@ void ntb_unregister_db_callback(struct ntb_device *ndev, unsigned int idx)
if (idx >= ndev->max_cbs || !ndev->db_cb[idx].callback)
return;
mask = readw(ndev->reg_ofs.pdb_mask);
mask = readw(ndev->reg_ofs.ldb_mask);
set_bit(idx * ndev->bits_per_vector, &mask);
writew(mask, ndev->reg_ofs.pdb_mask);
writew(mask, ndev->reg_ofs.ldb_mask);
ndev->db_cb[idx].callback = NULL;
}
@ -333,6 +350,23 @@ int ntb_read_remote_spad(struct ntb_device *ndev, unsigned int idx, u32 *val)
return 0;
}
/**
* ntb_get_mw_base() - get addr for the NTB memory window
* @ndev: pointer to ntb_device instance
* @mw: memory window number
*
* This function provides the base address of the memory window specified.
*
* RETURNS: address, or NULL on error.
*/
resource_size_t ntb_get_mw_base(struct ntb_device *ndev, unsigned int mw)
{
if (mw >= ntb_max_mw(ndev))
return 0;
return pci_resource_start(ndev->pdev, MW_TO_BAR(mw));
}
/**
* ntb_get_mw_vbase() - get virtual addr for the NTB memory window
* @ndev: pointer to ntb_device instance
@ -345,7 +379,7 @@ int ntb_read_remote_spad(struct ntb_device *ndev, unsigned int idx, u32 *val)
*/
void __iomem *ntb_get_mw_vbase(struct ntb_device *ndev, unsigned int mw)
{
if (mw >= NTB_NUM_MW)
if (mw >= ntb_max_mw(ndev))
return NULL;
return ndev->mw[mw].vbase;
@ -360,9 +394,9 @@ void __iomem *ntb_get_mw_vbase(struct ntb_device *ndev, unsigned int mw)
*
* RETURNS: the size of the memory window or zero on error
*/
resource_size_t ntb_get_mw_size(struct ntb_device *ndev, unsigned int mw)
u64 ntb_get_mw_size(struct ntb_device *ndev, unsigned int mw)
{
if (mw >= NTB_NUM_MW)
if (mw >= ntb_max_mw(ndev))
return 0;
return ndev->mw[mw].bar_sz;
@ -380,7 +414,7 @@ resource_size_t ntb_get_mw_size(struct ntb_device *ndev, unsigned int mw)
*/
void ntb_set_mw_addr(struct ntb_device *ndev, unsigned int mw, u64 addr)
{
if (mw >= NTB_NUM_MW)
if (mw >= ntb_max_mw(ndev))
return;
dev_dbg(&ndev->pdev->dev, "Writing addr %Lx to BAR %d\n", addr,
@ -390,16 +424,16 @@ void ntb_set_mw_addr(struct ntb_device *ndev, unsigned int mw, u64 addr)
switch (MW_TO_BAR(mw)) {
case NTB_BAR_23:
writeq(addr, ndev->reg_ofs.sbar2_xlat);
writeq(addr, ndev->reg_ofs.bar2_xlat);
break;
case NTB_BAR_45:
writeq(addr, ndev->reg_ofs.sbar4_xlat);
writeq(addr, ndev->reg_ofs.bar4_xlat);
break;
}
}
/**
* ntb_ring_sdb() - Set the doorbell on the secondary/external side
* ntb_ring_doorbell() - Set the doorbell on the secondary/external side
* @ndev: pointer to ntb_device instance
* @db: doorbell to ring
*
@ -408,15 +442,58 @@ void ntb_set_mw_addr(struct ntb_device *ndev, unsigned int mw, u64 addr)
*
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
*/
void ntb_ring_sdb(struct ntb_device *ndev, unsigned int db)
void ntb_ring_doorbell(struct ntb_device *ndev, unsigned int db)
{
dev_dbg(&ndev->pdev->dev, "%s: ringing doorbell %d\n", __func__, db);
if (ndev->hw_type == BWD_HW)
writeq((u64) 1 << db, ndev->reg_ofs.sdb);
writeq((u64) 1 << db, ndev->reg_ofs.rdb);
else
writew(((1 << ndev->bits_per_vector) - 1) <<
(db * ndev->bits_per_vector), ndev->reg_ofs.sdb);
(db * ndev->bits_per_vector), ndev->reg_ofs.rdb);
}
static void bwd_recover_link(struct ntb_device *ndev)
{
u32 status;
/* Driver resets the NTB ModPhy lanes - magic! */
writeb(0xe0, ndev->reg_base + BWD_MODPHY_PCSREG6);
writeb(0x40, ndev->reg_base + BWD_MODPHY_PCSREG4);
writeb(0x60, ndev->reg_base + BWD_MODPHY_PCSREG4);
writeb(0x60, ndev->reg_base + BWD_MODPHY_PCSREG6);
/* Driver waits 100ms to allow the NTB ModPhy to settle */
msleep(100);
/* Clear AER Errors, write to clear */
status = readl(ndev->reg_base + BWD_ERRCORSTS_OFFSET);
dev_dbg(&ndev->pdev->dev, "ERRCORSTS = %x\n", status);
status &= PCI_ERR_COR_REP_ROLL;
writel(status, ndev->reg_base + BWD_ERRCORSTS_OFFSET);
/* Clear unexpected electrical idle event in LTSSM, write to clear */
status = readl(ndev->reg_base + BWD_LTSSMERRSTS0_OFFSET);
dev_dbg(&ndev->pdev->dev, "LTSSMERRSTS0 = %x\n", status);
status |= BWD_LTSSMERRSTS0_UNEXPECTEDEI;
writel(status, ndev->reg_base + BWD_LTSSMERRSTS0_OFFSET);
/* Clear DeSkew Buffer error, write to clear */
status = readl(ndev->reg_base + BWD_DESKEWSTS_OFFSET);
dev_dbg(&ndev->pdev->dev, "DESKEWSTS = %x\n", status);
status |= BWD_DESKEWSTS_DBERR;
writel(status, ndev->reg_base + BWD_DESKEWSTS_OFFSET);
status = readl(ndev->reg_base + BWD_IBSTERRRCRVSTS0_OFFSET);
dev_dbg(&ndev->pdev->dev, "IBSTERRRCRVSTS0 = %x\n", status);
status &= BWD_IBIST_ERR_OFLOW;
writel(status, ndev->reg_base + BWD_IBSTERRRCRVSTS0_OFFSET);
/* Releases the NTB state machine to allow the link to retrain */
status = readl(ndev->reg_base + BWD_LTSSMSTATEJMP_OFFSET);
dev_dbg(&ndev->pdev->dev, "LTSSMSTATEJMP = %x\n", status);
status &= ~BWD_LTSSMSTATEJMP_FORCEDETECT;
writel(status, ndev->reg_base + BWD_LTSSMSTATEJMP_OFFSET);
}
static void ntb_link_event(struct ntb_device *ndev, int link_state)
@ -433,7 +510,8 @@ static void ntb_link_event(struct ntb_device *ndev, int link_state)
ndev->link_status = NTB_LINK_UP;
event = NTB_EVENT_HW_LINK_UP;
if (ndev->hw_type == BWD_HW)
if (ndev->hw_type == BWD_HW ||
ndev->conn_type == NTB_CONN_TRANSPARENT)
status = readw(ndev->reg_ofs.lnk_stat);
else {
int rc = pci_read_config_word(ndev->pdev,
@ -442,13 +520,16 @@ static void ntb_link_event(struct ntb_device *ndev, int link_state)
if (rc)
return;
}
ndev->link_width = (status & NTB_LINK_WIDTH_MASK) >> 4;
ndev->link_speed = (status & NTB_LINK_SPEED_MASK);
dev_info(&ndev->pdev->dev, "Link Width %d, Link Speed %d\n",
(status & NTB_LINK_WIDTH_MASK) >> 4,
(status & NTB_LINK_SPEED_MASK));
ndev->link_width, ndev->link_speed);
} else {
dev_info(&ndev->pdev->dev, "Link Down\n");
ndev->link_status = NTB_LINK_DOWN;
event = NTB_EVENT_HW_LINK_DOWN;
/* Don't modify link width/speed, we need it in link recovery */
}
/* notify the upper layer if we have an event change */
@ -488,6 +569,47 @@ static int ntb_link_status(struct ntb_device *ndev)
return 0;
}
static void bwd_link_recovery(struct work_struct *work)
{
struct ntb_device *ndev = container_of(work, struct ntb_device,
lr_timer.work);
u32 status32;
bwd_recover_link(ndev);
/* There is a potential race between the 2 NTB devices recovering at the
* same time. If the times are the same, the link will not recover and
* the driver will be stuck in this loop forever. Add a random interval
* to the recovery time to prevent this race.
*/
msleep(BWD_LINK_RECOVERY_TIME + prandom_u32() % BWD_LINK_RECOVERY_TIME);
status32 = readl(ndev->reg_base + BWD_LTSSMSTATEJMP_OFFSET);
if (status32 & BWD_LTSSMSTATEJMP_FORCEDETECT)
goto retry;
status32 = readl(ndev->reg_base + BWD_IBSTERRRCRVSTS0_OFFSET);
if (status32 & BWD_IBIST_ERR_OFLOW)
goto retry;
status32 = readl(ndev->reg_ofs.lnk_cntl);
if (!(status32 & BWD_CNTL_LINK_DOWN)) {
unsigned char speed, width;
u16 status16;
status16 = readw(ndev->reg_ofs.lnk_stat);
width = (status16 & NTB_LINK_WIDTH_MASK) >> 4;
speed = (status16 & NTB_LINK_SPEED_MASK);
if (ndev->link_width != width || ndev->link_speed != speed)
goto retry;
}
schedule_delayed_work(&ndev->hb_timer, NTB_HB_TIMEOUT);
return;
retry:
schedule_delayed_work(&ndev->lr_timer, NTB_HB_TIMEOUT);
}
/* BWD doesn't have link status interrupt, poll on that platform */
static void bwd_link_poll(struct work_struct *work)
{
@ -503,6 +625,16 @@ static void bwd_link_poll(struct work_struct *work)
if (rc)
dev_err(&ndev->pdev->dev,
"Error determining link status\n");
/* Check to see if a link error is the cause of the link down */
if (ndev->link_status == NTB_LINK_DOWN) {
u32 status32 = readl(ndev->reg_base +
BWD_LTSSMSTATEJMP_OFFSET);
if (status32 & BWD_LTSSMSTATEJMP_FORCEDETECT) {
schedule_delayed_work(&ndev->lr_timer, 0);
return;
}
}
}
schedule_delayed_work(&ndev->hb_timer, NTB_HB_TIMEOUT);
@ -519,41 +651,174 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
if (rc)
return rc;
if (val & SNB_PPD_DEV_TYPE)
ndev->dev_type = NTB_DEV_USD;
else
ndev->dev_type = NTB_DEV_DSD;
switch (val & SNB_PPD_CONN_TYPE) {
case NTB_CONN_B2B:
dev_info(&ndev->pdev->dev, "Conn Type = B2B\n");
ndev->conn_type = NTB_CONN_B2B;
ndev->reg_ofs.ldb = ndev->reg_base + SNB_PDOORBELL_OFFSET;
ndev->reg_ofs.ldb_mask = ndev->reg_base + SNB_PDBMSK_OFFSET;
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_spads = SNB_MAX_B2B_SPADS;
/* There is a Xeon hardware errata related to writes to
* SDOORBELL or B2BDOORBELL in conjunction with inbound access
* to NTB MMIO Space, which may hang the system. To workaround
* this use the second memory window to access the interrupt and
* scratch pad registers on the remote system.
*/
if (xeon_errata_workaround) {
if (!ndev->mw[1].bar_sz)
return -EINVAL;
ndev->limits.max_mw = SNB_ERRATA_MAX_MW;
ndev->reg_ofs.spad_write = ndev->mw[1].vbase +
SNB_SPAD_OFFSET;
ndev->reg_ofs.rdb = ndev->mw[1].vbase +
SNB_PDOORBELL_OFFSET;
/* Set the Limit register to 4k, the minimum size, to
* prevent an illegal access
*/
writeq(ndev->mw[1].bar_sz + 0x1000, ndev->reg_base +
SNB_PBAR4LMT_OFFSET);
} else {
ndev->limits.max_mw = SNB_MAX_MW;
ndev->reg_ofs.spad_write = ndev->reg_base +
SNB_B2B_SPAD_OFFSET;
ndev->reg_ofs.rdb = ndev->reg_base +
SNB_B2B_DOORBELL_OFFSET;
/* Disable the Limit register, just incase it is set to
* something silly
*/
writeq(0, ndev->reg_base + SNB_PBAR4LMT_OFFSET);
}
/* The Xeon errata workaround requires setting SBAR Base
* addresses to known values, so that the PBAR XLAT can be
* pointed at SBAR0 of the remote system.
*/
if (ndev->dev_type == NTB_DEV_USD) {
writeq(SNB_MBAR23_DSD_ADDR, ndev->reg_base +
SNB_PBAR2XLAT_OFFSET);
if (xeon_errata_workaround)
writeq(SNB_MBAR01_DSD_ADDR, ndev->reg_base +
SNB_PBAR4XLAT_OFFSET);
else {
writeq(SNB_MBAR45_DSD_ADDR, ndev->reg_base +
SNB_PBAR4XLAT_OFFSET);
/* B2B_XLAT_OFFSET is a 64bit register, but can
* only take 32bit writes
*/
writel(SNB_MBAR01_DSD_ADDR & 0xffffffff,
ndev->reg_base + SNB_B2B_XLAT_OFFSETL);
writel(SNB_MBAR01_DSD_ADDR >> 32,
ndev->reg_base + SNB_B2B_XLAT_OFFSETU);
}
writeq(SNB_MBAR01_USD_ADDR, ndev->reg_base +
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);
} else {
writeq(SNB_MBAR23_USD_ADDR, ndev->reg_base +
SNB_PBAR2XLAT_OFFSET);
if (xeon_errata_workaround)
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
* only take 32bit writes
*/
writel(SNB_MBAR01_DSD_ADDR & 0xffffffff,
ndev->reg_base + SNB_B2B_XLAT_OFFSETL);
writel(SNB_MBAR01_USD_ADDR >> 32,
ndev->reg_base + SNB_B2B_XLAT_OFFSETU);
}
writeq(SNB_MBAR01_DSD_ADDR, ndev->reg_base +
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);
}
break;
case NTB_CONN_CLASSIC:
case NTB_CONN_RP:
dev_info(&ndev->pdev->dev, "Conn Type = RP\n");
ndev->conn_type = NTB_CONN_RP;
if (xeon_errata_workaround) {
dev_err(&ndev->pdev->dev,
"NTB-RP disabled due to hardware errata. To disregard this warning and potentially lock-up the system, add the parameter 'xeon_errata_workaround=0'.\n");
return -EINVAL;
}
/* Scratch pads need to have exclusive access from the primary
* or secondary side. Halve the num spads so that each side can
* have an equal amount.
*/
ndev->limits.max_spads = SNB_MAX_COMPAT_SPADS / 2;
/* Note: The SDOORBELL is the cause of the errata. You REALLY
* don't want to touch it.
*/
ndev->reg_ofs.rdb = ndev->reg_base + SNB_SDOORBELL_OFFSET;
ndev->reg_ofs.ldb = ndev->reg_base + SNB_PDOORBELL_OFFSET;
ndev->reg_ofs.ldb_mask = ndev->reg_base + SNB_PDBMSK_OFFSET;
/* Offset the start of the spads to correspond to whether it is
* primary or secondary
*/
ndev->reg_ofs.spad_write = ndev->reg_base + SNB_SPAD_OFFSET +
ndev->limits.max_spads * 4;
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;
break;
case NTB_CONN_TRANSPARENT:
dev_info(&ndev->pdev->dev, "Conn Type = TRANSPARENT\n");
ndev->conn_type = NTB_CONN_TRANSPARENT;
/* Scratch pads need to have exclusive access from the primary
* or secondary side. Halve the num spads so that each side can
* have an equal amount.
*/
ndev->limits.max_spads = SNB_MAX_COMPAT_SPADS / 2;
ndev->reg_ofs.rdb = ndev->reg_base + SNB_PDOORBELL_OFFSET;
ndev->reg_ofs.ldb = ndev->reg_base + SNB_SDOORBELL_OFFSET;
ndev->reg_ofs.ldb_mask = ndev->reg_base + SNB_SDBMSK_OFFSET;
ndev->reg_ofs.spad_write = ndev->reg_base + SNB_SPAD_OFFSET;
/* Offset the start of the spads to correspond to whether it is
* primary or secondary
*/
ndev->reg_ofs.spad_read = ndev->reg_base + SNB_SPAD_OFFSET +
ndev->limits.max_spads * 4;
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;
break;
default:
dev_err(&ndev->pdev->dev, "Only B2B supported at this time\n");
/* Most likely caused by the remote NTB-RP device not being
* configured
*/
dev_err(&ndev->pdev->dev, "Unknown PPD %x\n", val);
return -EINVAL;
}
if (val & SNB_PPD_DEV_TYPE)
ndev->dev_type = NTB_DEV_DSD;
else
ndev->dev_type = NTB_DEV_USD;
ndev->reg_ofs.pdb = ndev->reg_base + SNB_PDOORBELL_OFFSET;
ndev->reg_ofs.pdb_mask = ndev->reg_base + SNB_PDBMSK_OFFSET;
ndev->reg_ofs.sbar2_xlat = ndev->reg_base + SNB_SBAR2XLAT_OFFSET;
ndev->reg_ofs.sbar4_xlat = ndev->reg_base + SNB_SBAR4XLAT_OFFSET;
ndev->reg_ofs.lnk_cntl = ndev->reg_base + SNB_NTBCNTL_OFFSET;
ndev->reg_ofs.lnk_stat = ndev->reg_base + SNB_LINK_STATUS_OFFSET;
ndev->reg_ofs.spad_read = ndev->reg_base + SNB_SPAD_OFFSET;
ndev->reg_ofs.lnk_stat = ndev->reg_base + SNB_SLINK_STATUS_OFFSET;
ndev->reg_ofs.spci_cmd = ndev->reg_base + SNB_PCICMD_OFFSET;
if (ndev->conn_type == NTB_CONN_B2B) {
ndev->reg_ofs.sdb = ndev->reg_base + SNB_B2B_DOORBELL_OFFSET;
ndev->reg_ofs.spad_write = ndev->reg_base + SNB_B2B_SPAD_OFFSET;
ndev->limits.max_spads = SNB_MAX_SPADS;
} else {
ndev->reg_ofs.sdb = ndev->reg_base + SNB_SDOORBELL_OFFSET;
ndev->reg_ofs.spad_write = ndev->reg_base + SNB_SPAD_OFFSET;
ndev->limits.max_spads = SNB_MAX_COMPAT_SPADS;
}
ndev->limits.max_db_bits = SNB_MAX_DB_BITS;
ndev->limits.msix_cnt = SNB_MSIX_CNT;
ndev->bits_per_vector = SNB_DB_BITS_PER_VEC;
@ -578,7 +843,7 @@ static int ntb_bwd_setup(struct ntb_device *ndev)
break;
case NTB_CONN_RP:
default:
dev_err(&ndev->pdev->dev, "Only B2B supported at this time\n");
dev_err(&ndev->pdev->dev, "Unsupported NTB configuration\n");
return -EINVAL;
}
@ -593,31 +858,25 @@ static int ntb_bwd_setup(struct ntb_device *ndev)
if (rc)
return rc;
ndev->reg_ofs.pdb = ndev->reg_base + BWD_PDOORBELL_OFFSET;
ndev->reg_ofs.pdb_mask = ndev->reg_base + BWD_PDBMSK_OFFSET;
ndev->reg_ofs.sbar2_xlat = ndev->reg_base + BWD_SBAR2XLAT_OFFSET;
ndev->reg_ofs.sbar4_xlat = ndev->reg_base + BWD_SBAR4XLAT_OFFSET;
ndev->reg_ofs.ldb = ndev->reg_base + BWD_PDOORBELL_OFFSET;
ndev->reg_ofs.ldb_mask = ndev->reg_base + BWD_PDBMSK_OFFSET;
ndev->reg_ofs.rdb = ndev->reg_base + BWD_B2B_DOORBELL_OFFSET;
ndev->reg_ofs.bar2_xlat = ndev->reg_base + BWD_SBAR2XLAT_OFFSET;
ndev->reg_ofs.bar4_xlat = ndev->reg_base + BWD_SBAR4XLAT_OFFSET;
ndev->reg_ofs.lnk_cntl = ndev->reg_base + BWD_NTBCNTL_OFFSET;
ndev->reg_ofs.lnk_stat = ndev->reg_base + BWD_LINK_STATUS_OFFSET;
ndev->reg_ofs.spad_read = ndev->reg_base + BWD_SPAD_OFFSET;
ndev->reg_ofs.spad_write = ndev->reg_base + BWD_B2B_SPAD_OFFSET;
ndev->reg_ofs.spci_cmd = ndev->reg_base + BWD_PCICMD_OFFSET;
if (ndev->conn_type == NTB_CONN_B2B) {
ndev->reg_ofs.sdb = ndev->reg_base + BWD_B2B_DOORBELL_OFFSET;
ndev->reg_ofs.spad_write = ndev->reg_base + BWD_B2B_SPAD_OFFSET;
ndev->limits.max_spads = BWD_MAX_SPADS;
} else {
ndev->reg_ofs.sdb = ndev->reg_base + BWD_PDOORBELL_OFFSET;
ndev->reg_ofs.spad_write = ndev->reg_base + BWD_SPAD_OFFSET;
ndev->limits.max_spads = BWD_MAX_COMPAT_SPADS;
}
ndev->limits.max_mw = BWD_MAX_MW;
ndev->limits.max_spads = BWD_MAX_SPADS;
ndev->limits.max_db_bits = BWD_MAX_DB_BITS;
ndev->limits.msix_cnt = BWD_MSIX_CNT;
ndev->bits_per_vector = BWD_DB_BITS_PER_VEC;
/* Since bwd doesn't have a link interrupt, setup a poll timer */
INIT_DELAYED_WORK(&ndev->hb_timer, bwd_link_poll);
INIT_DELAYED_WORK(&ndev->lr_timer, bwd_link_recovery);
schedule_delayed_work(&ndev->hb_timer, NTB_HB_TIMEOUT);
return 0;
@ -628,13 +887,18 @@ static int ntb_device_setup(struct ntb_device *ndev)
int rc;
switch (ndev->pdev->device) {
case PCI_DEVICE_ID_INTEL_NTB_2ND_SNB:
case PCI_DEVICE_ID_INTEL_NTB_RP_JSF:
case PCI_DEVICE_ID_INTEL_NTB_RP_SNB:
case PCI_DEVICE_ID_INTEL_NTB_CLASSIC_JSF:
case PCI_DEVICE_ID_INTEL_NTB_CLASSIC_SNB:
case PCI_DEVICE_ID_INTEL_NTB_SS_JSF:
case PCI_DEVICE_ID_INTEL_NTB_SS_SNB:
case PCI_DEVICE_ID_INTEL_NTB_SS_IVT:
case PCI_DEVICE_ID_INTEL_NTB_SS_HSX:
case PCI_DEVICE_ID_INTEL_NTB_PS_JSF:
case PCI_DEVICE_ID_INTEL_NTB_PS_SNB:
case PCI_DEVICE_ID_INTEL_NTB_PS_IVT:
case PCI_DEVICE_ID_INTEL_NTB_PS_HSX:
case PCI_DEVICE_ID_INTEL_NTB_B2B_JSF:
case PCI_DEVICE_ID_INTEL_NTB_B2B_SNB:
case PCI_DEVICE_ID_INTEL_NTB_B2B_IVT:
case PCI_DEVICE_ID_INTEL_NTB_B2B_HSX:
rc = ntb_xeon_setup(ndev);
break;
case PCI_DEVICE_ID_INTEL_NTB_B2B_BWD:
@ -644,16 +908,26 @@ static int ntb_device_setup(struct ntb_device *ndev)
rc = -ENODEV;
}
/* Enable Bus Master and Memory Space on the secondary side */
writew(PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER, ndev->reg_ofs.spci_cmd);
if (rc)
return rc;
return rc;
dev_info(&ndev->pdev->dev, "Device Type = %s\n",
ndev->dev_type == NTB_DEV_USD ? "USD/DSP" : "DSD/USP");
if (ndev->conn_type == NTB_CONN_B2B)
/* Enable Bus Master and Memory Space on the secondary side */
writew(PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER,
ndev->reg_ofs.spci_cmd);
return 0;
}
static void ntb_device_free(struct ntb_device *ndev)
{
if (ndev->hw_type == BWD_HW)
if (ndev->hw_type == BWD_HW) {
cancel_delayed_work_sync(&ndev->hb_timer);
cancel_delayed_work_sync(&ndev->lr_timer);
}
}
static irqreturn_t bwd_callback_msix_irq(int irq, void *data)
@ -672,7 +946,7 @@ static irqreturn_t bwd_callback_msix_irq(int irq, void *data)
*/
ndev->last_ts = jiffies;
writeq((u64) 1 << db_cb->db_num, ndev->reg_ofs.pdb);
writeq((u64) 1 << db_cb->db_num, ndev->reg_ofs.ldb);
return IRQ_HANDLED;
}
@ -694,7 +968,7 @@ static irqreturn_t xeon_callback_msix_irq(int irq, void *data)
* interrupts.
*/
writew(((1 << ndev->bits_per_vector) - 1) <<
(db_cb->db_num * ndev->bits_per_vector), ndev->reg_ofs.pdb);
(db_cb->db_num * ndev->bits_per_vector), ndev->reg_ofs.ldb);
return IRQ_HANDLED;
}
@ -712,7 +986,7 @@ static irqreturn_t xeon_event_msix_irq(int irq, void *dev)
dev_err(&ndev->pdev->dev, "Error determining link status\n");
/* bit 15 is always the link bit */
writew(1 << ndev->limits.max_db_bits, ndev->reg_ofs.pdb);
writew(1 << ndev->limits.max_db_bits, ndev->reg_ofs.ldb);
return IRQ_HANDLED;
}
@ -723,29 +997,28 @@ static irqreturn_t ntb_interrupt(int irq, void *dev)
unsigned int i = 0;
if (ndev->hw_type == BWD_HW) {
u64 pdb = readq(ndev->reg_ofs.pdb);
u64 ldb = readq(ndev->reg_ofs.ldb);
dev_dbg(&ndev->pdev->dev, "irq %d - pdb = %Lx\n", irq, pdb);
dev_dbg(&ndev->pdev->dev, "irq %d - ldb = %Lx\n", irq, ldb);
while (pdb) {
i = __ffs(pdb);
pdb &= pdb - 1;
while (ldb) {
i = __ffs(ldb);
ldb &= ldb - 1;
bwd_callback_msix_irq(irq, &ndev->db_cb[i]);
}
} else {
u16 pdb = readw(ndev->reg_ofs.pdb);
u16 ldb = readw(ndev->reg_ofs.ldb);
dev_dbg(&ndev->pdev->dev, "irq %d - pdb = %x sdb %x\n", irq,
pdb, readw(ndev->reg_ofs.sdb));
dev_dbg(&ndev->pdev->dev, "irq %d - ldb = %x\n", irq, ldb);
if (pdb & SNB_DB_HW_LINK) {
if (ldb & SNB_DB_HW_LINK) {
xeon_event_msix_irq(irq, dev);
pdb &= ~SNB_DB_HW_LINK;
ldb &= ~SNB_DB_HW_LINK;
}
while (pdb) {
i = __ffs(pdb);
pdb &= pdb - 1;
while (ldb) {
i = __ffs(ldb);
ldb &= ldb - 1;
xeon_callback_msix_irq(irq, &ndev->db_cb[i]);
}
}
@ -758,16 +1031,15 @@ static int ntb_setup_msix(struct ntb_device *ndev)
struct pci_dev *pdev = ndev->pdev;
struct msix_entry *msix;
int msix_entries;
int rc, i, pos;
int rc, i;
u16 val;
pos = pci_find_capability(pdev, PCI_CAP_ID_MSIX);
if (!pos) {
if (!pdev->msix_cap) {
rc = -EIO;
goto err;
}
rc = pci_read_config_word(pdev, pos + PCI_MSIX_FLAGS, &val);
rc = pci_read_config_word(pdev, pdev->msix_cap + PCI_MSIX_FLAGS, &val);
if (rc)
goto err;
@ -903,10 +1175,10 @@ static int ntb_setup_interrupts(struct ntb_device *ndev)
* Interrupt. The rest will be unmasked as callbacks are registered.
*/
if (ndev->hw_type == BWD_HW)
writeq(~0, ndev->reg_ofs.pdb_mask);
writeq(~0, ndev->reg_ofs.ldb_mask);
else
writew(~(1 << ndev->limits.max_db_bits),
ndev->reg_ofs.pdb_mask);
ndev->reg_ofs.ldb_mask);
rc = ntb_setup_msix(ndev);
if (!rc)
@ -935,9 +1207,9 @@ static void ntb_free_interrupts(struct ntb_device *ndev)
/* mask interrupts */
if (ndev->hw_type == BWD_HW)
writeq(~0, ndev->reg_ofs.pdb_mask);
writeq(~0, ndev->reg_ofs.ldb_mask);
else
writew(~0, ndev->reg_ofs.pdb_mask);
writew(~0, ndev->reg_ofs.ldb_mask);
if (ndev->num_msix) {
struct msix_entry *msix;
@ -963,9 +1235,9 @@ static int ntb_create_callbacks(struct ntb_device *ndev)
{
int i;
/* Checken-egg issue. We won't know how many callbacks are necessary
/* Chicken-egg issue. We won't know how many callbacks are necessary
* until we see how many MSI-X vectors we get, but these pointers need
* to be passed into the MSI-X register fucntion. So, we allocate the
* to be passed into the MSI-X register function. So, we allocate the
* max, knowing that they might not all be used, to work around this.
*/
ndev->db_cb = kcalloc(ndev->limits.max_db_bits,
@ -992,6 +1264,28 @@ static void ntb_free_callbacks(struct ntb_device *ndev)
kfree(ndev->db_cb);
}
static void ntb_setup_debugfs(struct ntb_device *ndev)
{
if (!debugfs_initialized())
return;
if (!debugfs_dir)
debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
ndev->debugfs_dir = debugfs_create_dir(pci_name(ndev->pdev),
debugfs_dir);
}
static void ntb_free_debugfs(struct ntb_device *ndev)
{
debugfs_remove_recursive(ndev->debugfs_dir);
if (debugfs_dir && simple_empty(debugfs_dir)) {
debugfs_remove_recursive(debugfs_dir);
debugfs_dir = NULL;
}
}
static int ntb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct ntb_device *ndev;
@ -1004,6 +1298,7 @@ static int ntb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
ndev->pdev = pdev;
ndev->link_status = NTB_LINK_DOWN;
pci_set_drvdata(pdev, ndev);
ntb_setup_debugfs(ndev);
rc = pci_enable_device(pdev);
if (rc)
@ -1022,13 +1317,13 @@ static int ntb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
goto err2;
}
for (i = 0; i < NTB_NUM_MW; i++) {
for (i = 0; i < NTB_MAX_NUM_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);
dev_info(&pdev->dev, "MW %d size %llu\n", i,
pci_resource_len(pdev, MW_TO_BAR(i)));
(unsigned long long) ndev->mw[i].bar_sz);
if (!ndev->mw[i].vbase) {
dev_warn(&pdev->dev, "Cannot remap BAR %d\n",
MW_TO_BAR(i));
@ -1100,6 +1395,7 @@ err2:
err1:
pci_disable_device(pdev);
err:
ntb_free_debugfs(ndev);
kfree(ndev);
dev_err(&pdev->dev, "Error loading %s module\n", KBUILD_MODNAME);
@ -1114,7 +1410,7 @@ static void ntb_pci_remove(struct pci_dev *pdev)
/* Bring NTB link down */
ntb_cntl = readl(ndev->reg_ofs.lnk_cntl);
ntb_cntl |= NTB_LINK_DISABLE;
ntb_cntl |= NTB_CNTL_LINK_DISABLE;
writel(ntb_cntl, ndev->reg_ofs.lnk_cntl);
ntb_transport_free(ndev->ntb_transport);
@ -1123,12 +1419,13 @@ static void ntb_pci_remove(struct pci_dev *pdev)
ntb_free_callbacks(ndev);
ntb_device_free(ndev);
for (i = 0; i < NTB_NUM_MW; i++)
for (i = 0; i < NTB_MAX_NUM_MW; i++)
iounmap(ndev->mw[i].vbase);
iounmap(ndev->reg_base);
pci_release_selected_regions(pdev, NTB_BAR_MASK);
pci_disable_device(pdev);
ntb_free_debugfs(ndev);
kfree(ndev);
}

105
drivers/ntb/ntb_hw.h
View File

@ -47,16 +47,36 @@
*/
#define PCI_DEVICE_ID_INTEL_NTB_B2B_JSF 0x3725
#define PCI_DEVICE_ID_INTEL_NTB_CLASSIC_JSF 0x3726
#define PCI_DEVICE_ID_INTEL_NTB_RP_JSF 0x3727
#define PCI_DEVICE_ID_INTEL_NTB_RP_SNB 0x3C08
#define PCI_DEVICE_ID_INTEL_NTB_PS_JSF 0x3726
#define PCI_DEVICE_ID_INTEL_NTB_SS_JSF 0x3727
#define PCI_DEVICE_ID_INTEL_NTB_B2B_SNB 0x3C0D
#define PCI_DEVICE_ID_INTEL_NTB_CLASSIC_SNB 0x3C0E
#define PCI_DEVICE_ID_INTEL_NTB_2ND_SNB 0x3C0F
#define PCI_DEVICE_ID_INTEL_NTB_PS_SNB 0x3C0E
#define PCI_DEVICE_ID_INTEL_NTB_SS_SNB 0x3C0F
#define PCI_DEVICE_ID_INTEL_NTB_B2B_IVT 0x0E0D
#define PCI_DEVICE_ID_INTEL_NTB_PS_IVT 0x0E0E
#define PCI_DEVICE_ID_INTEL_NTB_SS_IVT 0x0E0F
#define PCI_DEVICE_ID_INTEL_NTB_B2B_HSX 0x2F0D
#define PCI_DEVICE_ID_INTEL_NTB_PS_HSX 0x2F0E
#define PCI_DEVICE_ID_INTEL_NTB_SS_HSX 0x2F0F
#define PCI_DEVICE_ID_INTEL_NTB_B2B_BWD 0x0C4E
#define msix_table_size(control) ((control & PCI_MSIX_FLAGS_QSIZE)+1)
#ifndef readq
static inline u64 readq(void __iomem *addr)
{
return readl(addr) | (((u64) readl(addr + 4)) << 32LL);
}
#endif
#ifndef writeq
static inline void writeq(u64 val, void __iomem *addr)
{
writel(val & 0xffffffff, addr);
writel(val >> 32, addr + 4);
}
#endif
#define NTB_BAR_MMIO 0
#define NTB_BAR_23 2
#define NTB_BAR_45 4
@ -68,7 +88,7 @@
#define NTB_HB_TIMEOUT msecs_to_jiffies(1000)
#define NTB_NUM_MW 2
#define NTB_MAX_NUM_MW 2
enum ntb_hw_event {
NTB_EVENT_SW_EVENT0 = 0,
@ -96,18 +116,19 @@ struct ntb_device {
struct pci_dev *pdev;
struct msix_entry *msix_entries;
void __iomem *reg_base;
struct ntb_mw mw[NTB_NUM_MW];
struct ntb_mw mw[NTB_MAX_NUM_MW];
struct {
unsigned int max_spads;
unsigned int max_db_bits;
unsigned int msix_cnt;
unsigned char max_mw;
unsigned char max_spads;
unsigned char max_db_bits;
unsigned char msix_cnt;
} limits;
struct {
void __iomem *pdb;
void __iomem *pdb_mask;
void __iomem *sdb;
void __iomem *sbar2_xlat;
void __iomem *sbar4_xlat;
void __iomem *ldb;
void __iomem *ldb_mask;
void __iomem *rdb;
void __iomem *bar2_xlat;
void __iomem *bar4_xlat;
void __iomem *spad_write;
void __iomem *spad_read;
void __iomem *lnk_cntl;
@ -124,11 +145,44 @@ struct ntb_device {
unsigned char num_msix;
unsigned char bits_per_vector;
unsigned char max_cbs;
unsigned char link_width;
unsigned char link_speed;
unsigned char link_status;
struct delayed_work hb_timer;
unsigned long last_ts;
struct delayed_work lr_timer;
struct dentry *debugfs_dir;
};
/**
* ntb_max_cbs() - return the max callbacks
* @ndev: pointer to ntb_device instance
*
* Given the ntb pointer, return the maximum number of callbacks
*
* RETURNS: the maximum number of callbacks
*/
static inline unsigned char ntb_max_cbs(struct ntb_device *ndev)
{
return ndev->max_cbs;
}
/**
* ntb_max_mw() - return the max number of memory windows
* @ndev: pointer to ntb_device instance
*
* Given the ntb pointer, return the maximum number of memory windows
*
* RETURNS: the maximum number of memory windows
*/
static inline unsigned char ntb_max_mw(struct ntb_device *ndev)
{
return ndev->limits.max_mw;
}
/**
* ntb_hw_link_status() - return the hardware link status
* @ndev: pointer to ntb_device instance
@ -146,7 +200,7 @@ static inline bool ntb_hw_link_status(struct ntb_device *ndev)
* ntb_query_pdev() - return the pci_dev pointer
* @ndev: pointer to ntb_device instance
*
* Given the ntb pointer return the pci_dev pointerfor the NTB hardware device
* Given the ntb pointer, return the pci_dev pointer for the NTB hardware device
*
* RETURNS: a pointer to the ntb pci_dev
*/
@ -155,6 +209,20 @@ static inline struct pci_dev *ntb_query_pdev(struct ntb_device *ndev)
return ndev->pdev;
}
/**
* ntb_query_debugfs() - return the debugfs pointer
* @ndev: pointer to ntb_device instance
*
* Given the ntb pointer, return the debugfs directory pointer for the NTB
* hardware device
*
* RETURNS: a pointer to the debugfs directory
*/
static inline struct dentry *ntb_query_debugfs(struct ntb_device *ndev)
{
return ndev->debugfs_dir;
}
struct ntb_device *ntb_register_transport(struct pci_dev *pdev,
void *transport);
void ntb_unregister_transport(struct ntb_device *ndev);
@ -172,9 +240,10 @@ int ntb_write_local_spad(struct ntb_device *ndev, unsigned int idx, u32 val);
int ntb_read_local_spad(struct ntb_device *ndev, unsigned int idx, u32 *val);
int ntb_write_remote_spad(struct ntb_device *ndev, unsigned int idx, u32 val);
int ntb_read_remote_spad(struct ntb_device *ndev, unsigned int idx, u32 *val);
resource_size_t ntb_get_mw_base(struct ntb_device *ndev, unsigned int mw);
void __iomem *ntb_get_mw_vbase(struct ntb_device *ndev, unsigned int mw);
resource_size_t ntb_get_mw_size(struct ntb_device *ndev, unsigned int mw);
void ntb_ring_sdb(struct ntb_device *ndev, unsigned int idx);
u64 ntb_get_mw_size(struct ntb_device *ndev, unsigned int mw);
void ntb_ring_doorbell(struct ntb_device *ndev, unsigned int idx);
void *ntb_find_transport(struct pci_dev *pdev);
int ntb_transport_init(struct pci_dev *pdev);

50
drivers/ntb/ntb_regs.h
View File

@ -46,23 +46,24 @@
* Jon Mason <jon.mason@intel.com>
*/
#define NTB_LINK_ENABLE 0x0000
#define NTB_LINK_DISABLE 0x0002
#define NTB_LINK_STATUS_ACTIVE 0x2000
#define NTB_LINK_SPEED_MASK 0x000f
#define NTB_LINK_WIDTH_MASK 0x03f0
#define SNB_MSIX_CNT 4
#define SNB_MAX_SPADS 16
#define SNB_MAX_COMPAT_SPADS 8
#define SNB_MAX_B2B_SPADS 16
#define SNB_MAX_COMPAT_SPADS 16
/* Reserve the uppermost bit for link interrupt */
#define SNB_MAX_DB_BITS 15
#define SNB_DB_BITS_PER_VEC 5
#define SNB_MAX_MW 2
#define SNB_ERRATA_MAX_MW 1
#define SNB_DB_HW_LINK 0x8000
#define SNB_PCICMD_OFFSET 0x0504
#define SNB_DEVCTRL_OFFSET 0x0598
#define SNB_SLINK_STATUS_OFFSET 0x05A2
#define SNB_LINK_STATUS_OFFSET 0x01A2
#define SNB_PBAR2LMT_OFFSET 0x0000
@ -74,6 +75,9 @@
#define SNB_SBAR2XLAT_OFFSET 0x0030
#define SNB_SBAR4XLAT_OFFSET 0x0038
#define SNB_SBAR0BASE_OFFSET 0x0040
#define SNB_SBAR0BASE_OFFSET 0x0040
#define SNB_SBAR2BASE_OFFSET 0x0048
#define SNB_SBAR4BASE_OFFSET 0x0050
#define SNB_SBAR2BASE_OFFSET 0x0048
#define SNB_SBAR4BASE_OFFSET 0x0050
#define SNB_NTBCNTL_OFFSET 0x0058
@ -88,19 +92,28 @@
#define SNB_WCCNTRL_OFFSET 0x00e0
#define SNB_B2B_SPAD_OFFSET 0x0100
#define SNB_B2B_DOORBELL_OFFSET 0x0140
#define SNB_B2B_XLAT_OFFSET 0x0144
#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
#define BWD_MSIX_CNT 34
#define BWD_MAX_SPADS 16
#define BWD_MAX_COMPAT_SPADS 16
#define BWD_MAX_DB_BITS 34
#define BWD_DB_BITS_PER_VEC 1
#define BWD_MAX_MW 2
#define BWD_PCICMD_OFFSET 0xb004
#define BWD_MBAR23_OFFSET 0xb018
#define BWD_MBAR45_OFFSET 0xb020
#define BWD_DEVCTRL_OFFSET 0xb048
#define BWD_LINK_STATUS_OFFSET 0xb052
#define BWD_ERRCORSTS_OFFSET 0xb110
#define BWD_SBAR2XLAT_OFFSET 0x0008
#define BWD_SBAR4XLAT_OFFSET 0x0010
@ -118,6 +131,22 @@
#define BWD_B2B_SPADSEMA_OFFSET 0x80c0
#define BWD_B2B_STKYSPAD_OFFSET 0x80c4
#define BWD_MODPHY_PCSREG4 0x1c004
#define BWD_MODPHY_PCSREG6 0x1c006
#define BWD_IP_BASE 0xC000
#define BWD_DESKEWSTS_OFFSET (BWD_IP_BASE + 0x3024)
#define BWD_LTSSMERRSTS0_OFFSET (BWD_IP_BASE + 0x3180)
#define BWD_LTSSMSTATEJMP_OFFSET (BWD_IP_BASE + 0x3040)
#define BWD_IBSTERRRCRVSTS0_OFFSET (BWD_IP_BASE + 0x3324)
#define BWD_DESKEWSTS_DBERR (1 << 15)
#define BWD_LTSSMERRSTS0_UNEXPECTEDEI (1 << 20)
#define BWD_LTSSMSTATEJMP_FORCEDETECT (1 << 2)
#define BWD_IBIST_ERR_OFLOW 0x7FFF7FFF
#define NTB_CNTL_CFG_LOCK (1 << 0)
#define NTB_CNTL_LINK_DISABLE (1 << 1)
#define NTB_CNTL_BAR23_SNOOP (1 << 2)
#define NTB_CNTL_BAR45_SNOOP (1 << 6)
#define BWD_CNTL_LINK_DOWN (1 << 16)
@ -128,12 +157,3 @@
#define BWD_PPD_INIT_LINK 0x0008
#define BWD_PPD_CONN_TYPE 0x0300
#define BWD_PPD_DEV_TYPE 0x1000
#define BWD_PBAR2XLAT_USD_ADDR 0x0000004000000000
#define BWD_PBAR4XLAT_USD_ADDR 0x0000008000000000
#define BWD_MBAR23_USD_ADDR 0x000000410000000C
#define BWD_MBAR45_USD_ADDR 0x000000810000000C
#define BWD_PBAR2XLAT_DSD_ADDR 0x0000004100000000
#define BWD_PBAR4XLAT_DSD_ADDR 0x0000008100000000
#define BWD_MBAR23_DSD_ADDR 0x000000400000000C
#define BWD_MBAR45_DSD_ADDR 0x000000800000000C

428
drivers/ntb/ntb_transport.c
View File

@ -47,6 +47,7 @@
*/
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/export.h>
@ -64,10 +65,14 @@ static unsigned int transport_mtu = 0x401E;
module_param(transport_mtu, uint, 0644);
MODULE_PARM_DESC(transport_mtu, "Maximum size of NTB transport packets");
static unsigned char max_num_clients = 2;
static unsigned char max_num_clients;
module_param(max_num_clients, byte, 0644);
MODULE_PARM_DESC(max_num_clients, "Maximum number of NTB transport clients");
static unsigned int copy_bytes = 1024;
module_param(copy_bytes, uint, 0644);
MODULE_PARM_DESC(copy_bytes, "Threshold under which NTB will use the CPU to copy instead of DMA");
struct ntb_queue_entry {
/* ntb_queue list reference */
struct list_head entry;
@ -76,6 +81,13 @@ struct ntb_queue_entry {
void *buf;
unsigned int len;
unsigned int flags;
struct ntb_transport_qp *qp;
union {
struct ntb_payload_header __iomem *tx_hdr;
struct ntb_payload_header *rx_hdr;
};
unsigned int index;
};
struct ntb_rx_info {
@ -86,6 +98,7 @@ struct ntb_transport_qp {
struct ntb_transport *transport;
struct ntb_device *ndev;
void *cb_data;
struct dma_chan *dma_chan;
bool client_ready;
bool qp_link;
@ -99,6 +112,7 @@ struct ntb_transport_qp {
struct list_head tx_free_q;
spinlock_t ntb_tx_free_q_lock;
void __iomem *tx_mw;
dma_addr_t tx_mw_phys;
unsigned int tx_index;
unsigned int tx_max_entry;
unsigned int tx_max_frame;
@ -114,6 +128,7 @@ struct ntb_transport_qp {
unsigned int rx_index;
unsigned int rx_max_entry;
unsigned int rx_max_frame;
dma_cookie_t last_cookie;
void (*event_handler) (void *data, int status);
struct delayed_work link_work;
@ -129,9 +144,14 @@ struct ntb_transport_qp {
u64 rx_err_no_buf;
u64 rx_err_oflow;
u64 rx_err_ver;
u64 rx_memcpy;
u64 rx_async;
u64 tx_bytes;
u64 tx_pkts;
u64 tx_ring_full;
u64 tx_err_no_buf;
u64 tx_memcpy;
u64 tx_async;
};
struct ntb_transport_mw {
@ -150,14 +170,13 @@ struct ntb_transport {
struct list_head client_devs;
struct ntb_device *ndev;
struct ntb_transport_mw mw[NTB_NUM_MW];
struct ntb_transport_mw *mw;
struct ntb_transport_qp *qps;
unsigned int max_qps;
unsigned long qp_bitmap;
bool transport_link;
struct delayed_work link_work;
struct work_struct link_cleanup;
struct dentry *debugfs_dir;
};
enum {
@ -183,7 +202,7 @@ enum {
MAX_SPAD,
};
#define QP_TO_MW(qp) ((qp) % NTB_NUM_MW)
#define QP_TO_MW(ndev, qp) ((qp) % ntb_max_mw(ndev))
#define NTB_QP_DEF_NUM_ENTRIES 100
#define NTB_LINK_DOWN_TIMEOUT 10
@ -382,7 +401,7 @@ static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count,
char *buf;
ssize_t ret, out_offset, out_count;
out_count = 600;
out_count = 1000;
buf = kmalloc(out_count, GFP_KERNEL);
if (!buf)
@ -396,6 +415,10 @@ static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count,
"rx_bytes - \t%llu\n", qp->rx_bytes);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_pkts - \t%llu\n", qp->rx_pkts);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_memcpy - \t%llu\n", qp->rx_memcpy);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_async - \t%llu\n", qp->rx_async);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_ring_empty - %llu\n", qp->rx_ring_empty);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
@ -415,8 +438,14 @@ static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count,
"tx_bytes - \t%llu\n", qp->tx_bytes);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_pkts - \t%llu\n", qp->tx_pkts);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_memcpy - \t%llu\n", qp->tx_memcpy);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_async - \t%llu\n", qp->tx_async);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_ring_full - \t%llu\n", qp->tx_ring_full);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_err_no_buf - %llu\n", qp->tx_err_no_buf);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_mw - \t%p\n", qp->tx_mw);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
@ -475,22 +504,25 @@ static void ntb_transport_setup_qp_mw(struct ntb_transport *nt,
{
struct ntb_transport_qp *qp = &nt->qps[qp_num];
unsigned int rx_size, num_qps_mw;
u8 mw_num = QP_TO_MW(qp_num);
u8 mw_num, mw_max;
unsigned int i;
mw_max = ntb_max_mw(nt->ndev);
mw_num = QP_TO_MW(nt->ndev, qp_num);
WARN_ON(nt->mw[mw_num].virt_addr == NULL);
if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW)
num_qps_mw = nt->max_qps / NTB_NUM_MW + 1;
if (nt->max_qps % mw_max && mw_num < nt->max_qps % mw_max)
num_qps_mw = nt->max_qps / mw_max + 1;
else
num_qps_mw = nt->max_qps / NTB_NUM_MW;
num_qps_mw = nt->max_qps / mw_max;
rx_size = (unsigned int) nt->mw[mw_num].size / num_qps_mw;
qp->remote_rx_info = nt->mw[mw_num].virt_addr +
(qp_num / NTB_NUM_MW * rx_size);
qp->rx_buff = nt->mw[mw_num].virt_addr + qp_num / mw_max * rx_size;
rx_size -= sizeof(struct ntb_rx_info);
qp->rx_buff = qp->remote_rx_info + 1;
qp->remote_rx_info = qp->rx_buff + rx_size;
/* Due to housekeeping, there must be atleast 2 buffs */
qp->rx_max_frame = min(transport_mtu, rx_size / 2);
qp->rx_max_entry = rx_size / qp->rx_max_frame;
@ -631,7 +663,7 @@ static void ntb_transport_link_work(struct work_struct *work)
int rc, i;
/* send the local info, in the opposite order of the way we read it */
for (i = 0; i < NTB_NUM_MW; i++) {
for (i = 0; i < ntb_max_mw(ndev); i++) {
rc = ntb_write_remote_spad(ndev, MW0_SZ_HIGH + (i * 2),
ntb_get_mw_size(ndev, i) >> 32);
if (rc) {
@ -651,10 +683,10 @@ static void ntb_transport_link_work(struct work_struct *work)
}
}
rc = ntb_write_remote_spad(ndev, NUM_MWS, NTB_NUM_MW);
rc = ntb_write_remote_spad(ndev, NUM_MWS, ntb_max_mw(ndev));
if (rc) {
dev_err(&pdev->dev, "Error writing %x to remote spad %d\n",
NTB_NUM_MW, NUM_MWS);
ntb_max_mw(ndev), NUM_MWS);
goto out;
}
@ -699,11 +731,11 @@ static void ntb_transport_link_work(struct work_struct *work)
goto out;
}
if (val != NTB_NUM_MW)
if (val != ntb_max_mw(ndev))
goto out;
dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val);
for (i = 0; i < NTB_NUM_MW; i++) {
for (i = 0; i < ntb_max_mw(ndev); i++) {
u64 val64;
rc = ntb_read_remote_spad(ndev, MW0_SZ_HIGH + (i * 2), &val);
@ -745,7 +777,7 @@ static void ntb_transport_link_work(struct work_struct *work)
return;
out1:
for (i = 0; i < NTB_NUM_MW; i++)
for (i = 0; i < ntb_max_mw(ndev); i++)
ntb_free_mw(nt, i);
out:
if (ntb_hw_link_status(ndev))
@ -794,12 +826,16 @@ static void ntb_qp_link_work(struct work_struct *work)
msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT));
}
static void ntb_transport_init_queue(struct ntb_transport *nt,
static int ntb_transport_init_queue(struct ntb_transport *nt,
unsigned int qp_num)
{
struct ntb_transport_qp *qp;
unsigned int num_qps_mw, tx_size;
u8 mw_num = QP_TO_MW(qp_num);
u8 mw_num, mw_max;
u64 qp_offset;
mw_max = ntb_max_mw(nt->ndev);
mw_num = QP_TO_MW(nt->ndev, qp_num);
qp = &nt->qps[qp_num];
qp->qp_num = qp_num;
@ -809,27 +845,34 @@ static void ntb_transport_init_queue(struct ntb_transport *nt,
qp->client_ready = NTB_LINK_DOWN;
qp->event_handler = NULL;
if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW)
num_qps_mw = nt->max_qps / NTB_NUM_MW + 1;
if (nt->max_qps % mw_max && mw_num < nt->max_qps % mw_max)
num_qps_mw = nt->max_qps / mw_max + 1;
else
num_qps_mw = nt->max_qps / NTB_NUM_MW;
num_qps_mw = nt->max_qps / mw_max;
tx_size = (unsigned int) ntb_get_mw_size(qp->ndev, mw_num) / num_qps_mw;
qp->rx_info = ntb_get_mw_vbase(nt->ndev, mw_num) +
(qp_num / NTB_NUM_MW * tx_size);
tx_size -= sizeof(struct ntb_rx_info);
qp_offset = qp_num / mw_max * tx_size;
qp->tx_mw = ntb_get_mw_vbase(nt->ndev, mw_num) + qp_offset;
if (!qp->tx_mw)
return -EINVAL;
qp->tx_mw_phys = ntb_get_mw_base(qp->ndev, mw_num) + qp_offset;
if (!qp->tx_mw_phys)
return -EINVAL;
tx_size -= sizeof(struct ntb_rx_info);
qp->rx_info = qp->tx_mw + tx_size;
qp->tx_mw = qp->rx_info + 1;
/* Due to housekeeping, there must be atleast 2 buffs */
qp->tx_max_frame = min(transport_mtu, tx_size / 2);
qp->tx_max_entry = tx_size / qp->tx_max_frame;
if (nt->debugfs_dir) {
if (ntb_query_debugfs(nt->ndev)) {
char debugfs_name[4];
snprintf(debugfs_name, 4, "qp%d", qp_num);
qp->debugfs_dir = debugfs_create_dir(debugfs_name,
nt->debugfs_dir);
ntb_query_debugfs(nt->ndev));
qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR,
qp->debugfs_dir, qp,
@ -846,6 +889,8 @@ static void ntb_transport_init_queue(struct ntb_transport *nt,
INIT_LIST_HEAD(&qp->rx_pend_q);
INIT_LIST_HEAD(&qp->rx_free_q);
INIT_LIST_HEAD(&qp->tx_free_q);
return 0;
}
int ntb_transport_init(struct pci_dev *pdev)
@ -857,30 +902,38 @@ int ntb_transport_init(struct pci_dev *pdev)
if (!nt)
return -ENOMEM;
if (debugfs_initialized())
nt->debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
else
nt->debugfs_dir = NULL;
nt->ndev = ntb_register_transport(pdev, nt);
if (!nt->ndev) {
rc = -EIO;
goto err;
}
nt->max_qps = min(nt->ndev->max_cbs, max_num_clients);
nt->mw = kcalloc(ntb_max_mw(nt->ndev), sizeof(struct ntb_transport_mw),
GFP_KERNEL);
if (!nt->mw) {
rc = -ENOMEM;
goto err1;
}
if (max_num_clients)
nt->max_qps = min(ntb_max_cbs(nt->ndev), max_num_clients);
else
nt->max_qps = min(ntb_max_cbs(nt->ndev), ntb_max_mw(nt->ndev));
nt->qps = kcalloc(nt->max_qps, sizeof(struct ntb_transport_qp),
GFP_KERNEL);
if (!nt->qps) {
rc = -ENOMEM;
goto err1;
goto err2;
}
nt->qp_bitmap = ((u64) 1 << nt->max_qps) - 1;
for (i = 0; i < nt->max_qps; i++)
ntb_transport_init_queue(nt, i);
for (i = 0; i < nt->max_qps; i++) {
rc = ntb_transport_init_queue(nt, i);
if (rc)
goto err3;
}
INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work);
INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup);
@ -888,26 +941,27 @@ int ntb_transport_init(struct pci_dev *pdev)
rc = ntb_register_event_callback(nt->ndev,
ntb_transport_event_callback);
if (rc)
goto err2;
goto err3;
INIT_LIST_HEAD(&nt->client_devs);
rc = ntb_bus_init(nt);
if (rc)
goto err3;
goto err4;
if (ntb_hw_link_status(nt->ndev))
schedule_delayed_work(&nt->link_work, 0);
return 0;
err3:
err4:
ntb_unregister_event_callback(nt->ndev);
err2:
err3:
kfree(nt->qps);
err2:
kfree(nt->mw);
err1:
ntb_unregister_transport(nt->ndev);
err:
debugfs_remove_recursive(nt->debugfs_dir);
kfree(nt);
return rc;
}
@ -915,41 +969,46 @@ err:
void ntb_transport_free(void *transport)
{
struct ntb_transport *nt = transport;
struct pci_dev *pdev;
struct ntb_device *ndev = nt->ndev;
int i;
nt->transport_link = NTB_LINK_DOWN;
/* verify that all the qp's are freed */
for (i = 0; i < nt->max_qps; i++)
for (i = 0; i < nt->max_qps; i++) {
if (!test_bit(i, &nt->qp_bitmap))
ntb_transport_free_queue(&nt->qps[i]);
debugfs_remove_recursive(nt->qps[i].debugfs_dir);
}
ntb_bus_remove(nt);
cancel_delayed_work_sync(&nt->link_work);
debugfs_remove_recursive(nt->debugfs_dir);
ntb_unregister_event_callback(ndev);
ntb_unregister_event_callback(nt->ndev);
pdev = ntb_query_pdev(nt->ndev);
for (i = 0; i < NTB_NUM_MW; i++)
for (i = 0; i < ntb_max_mw(ndev); i++)
ntb_free_mw(nt, i);
kfree(nt->qps);
ntb_unregister_transport(nt->ndev);
kfree(nt->mw);
ntb_unregister_transport(ndev);
kfree(nt);
}
static void ntb_rx_copy_task(struct ntb_transport_qp *qp,
struct ntb_queue_entry *entry, void *offset)
static void ntb_rx_copy_callback(void *data)
{
struct ntb_queue_entry *entry = data;
struct ntb_transport_qp *qp = entry->qp;
void *cb_data = entry->cb_data;
unsigned int len = entry->len;
struct ntb_payload_header *hdr = entry->rx_hdr;
memcpy(entry->buf, offset, entry->len);
/* Ensure that the data is fully copied out before clearing the flag */
wmb();
hdr->flags = 0;
iowrite32(entry->index, &qp->rx_info->entry);
ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q);
@ -957,6 +1016,86 @@ static void ntb_rx_copy_task(struct ntb_transport_qp *qp,
qp->rx_handler(qp, qp->cb_data, cb_data, len);
}
static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset)
{
void *buf = entry->buf;
size_t len = entry->len;
memcpy(buf, offset, len);
ntb_rx_copy_callback(entry);
}
static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset,
size_t len)
{
struct dma_async_tx_descriptor *txd;
struct ntb_transport_qp *qp = entry->qp;
struct dma_chan *chan = qp->dma_chan;
struct dma_device *device;
size_t pay_off, buff_off;
dma_addr_t src, dest;
dma_cookie_t cookie;
void *buf = entry->buf;
unsigned long flags;
entry->len = len;
if (!chan)
goto err;
if (len < copy_bytes)
goto err1;
device = chan->device;
pay_off = (size_t) offset & ~PAGE_MASK;
buff_off = (size_t) buf & ~PAGE_MASK;
if (!is_dma_copy_aligned(device, pay_off, buff_off, len))
goto err1;
dest = dma_map_single(device->dev, buf, len, DMA_FROM_DEVICE);
if (dma_mapping_error(device->dev, dest))
goto err1;
src = dma_map_single(device->dev, offset, len, DMA_TO_DEVICE);
if (dma_mapping_error(device->dev, src))
goto err2;
flags = DMA_COMPL_DEST_UNMAP_SINGLE | DMA_COMPL_SRC_UNMAP_SINGLE |
DMA_PREP_INTERRUPT;
txd = device->device_prep_dma_memcpy(chan, dest, src, len, flags);
if (!txd)
goto err3;
txd->callback = ntb_rx_copy_callback;
txd->callback_param = entry;
cookie = dmaengine_submit(txd);
if (dma_submit_error(cookie))
goto err3;
qp->last_cookie = cookie;
qp->rx_async++;
return;
err3:
dma_unmap_single(device->dev, src, len, DMA_TO_DEVICE);
err2:
dma_unmap_single(device->dev, dest, len, DMA_FROM_DEVICE);
err1:
/* If the callbacks come out of order, the writing of the index to the
* last completed will be out of order. This may result in the
* receive stalling forever.
*/
dma_sync_wait(chan, qp->last_cookie);
err:
ntb_memcpy_rx(entry, offset);
qp->rx_memcpy++;
}
static int ntb_process_rxc(struct ntb_transport_qp *qp)
{
struct ntb_payload_header *hdr;
@ -995,41 +1134,45 @@ static int ntb_process_rxc(struct ntb_transport_qp *qp)
if (hdr->flags & LINK_DOWN_FLAG) {
ntb_qp_link_down(qp);
ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry,
&qp->rx_pend_q);
goto out;
goto err;
}
dev_dbg(&ntb_query_pdev(qp->ndev)->dev,
"rx offset %u, ver %u - %d payload received, buf size %d\n",
qp->rx_index, hdr->ver, hdr->len, entry->len);
if (hdr->len <= entry->len) {
entry->len = hdr->len;
ntb_rx_copy_task(qp, entry, offset);
} else {
ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry,
&qp->rx_pend_q);
qp->rx_bytes += hdr->len;
qp->rx_pkts++;
if (hdr->len > entry->len) {
qp->rx_err_oflow++;
dev_dbg(&ntb_query_pdev(qp->ndev)->dev,
"RX overflow! Wanted %d got %d\n",
hdr->len, entry->len);
goto err;
}
qp->rx_bytes += hdr->len;
qp->rx_pkts++;
entry->index = qp->rx_index;
entry->rx_hdr = hdr;
ntb_async_rx(entry, offset, hdr->len);
out:
qp->rx_index++;
qp->rx_index %= qp->rx_max_entry;
return 0;
err:
ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry,
&qp->rx_pend_q);
/* Ensure that the data is fully copied out before clearing the flag */
wmb();
hdr->flags = 0;
iowrite32(qp->rx_index, &qp->rx_info->entry);
qp->rx_index++;
qp->rx_index %= qp->rx_max_entry;
return 0;
goto out;
}
static void ntb_transport_rx(unsigned long data)
@ -1045,6 +1188,9 @@ static void ntb_transport_rx(unsigned long data)
if (rc)
break;
}
if (qp->dma_chan)
dma_async_issue_pending(qp->dma_chan);
}
static void ntb_transport_rxc_db(void *data, int db_num)
@ -1057,23 +1203,17 @@ static void ntb_transport_rxc_db(void *data, int db_num)
tasklet_schedule(&qp->rx_work);
}
static void ntb_tx_copy_task(struct ntb_transport_qp *qp,
struct ntb_queue_entry *entry,
void __iomem *offset)
static void ntb_tx_copy_callback(void *data)
{
struct ntb_payload_header __iomem *hdr;
struct ntb_queue_entry *entry = data;
struct ntb_transport_qp *qp = entry->qp;
struct ntb_payload_header __iomem *hdr = entry->tx_hdr;
memcpy_toio(offset, entry->buf, entry->len);
hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header);
iowrite32(entry->len, &hdr->len);
iowrite32((u32) qp->tx_pkts, &hdr->ver);
/* Ensure that the data is fully copied out before setting the flag */
/* Ensure that the data is fully copied out before setting the flags */
wmb();
iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags);
ntb_ring_sdb(qp->ndev, qp->qp_num);
ntb_ring_doorbell(qp->ndev, qp->qp_num);
/* The entry length can only be zero if the packet is intended to be a
* "link down" or similar. Since no payload is being sent in these
@ -1090,15 +1230,81 @@ static void ntb_tx_copy_task(struct ntb_transport_qp *qp,
ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q);
}
static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset)
{
memcpy_toio(offset, entry->buf, entry->len);
ntb_tx_copy_callback(entry);
}
static void ntb_async_tx(struct ntb_transport_qp *qp,
struct ntb_queue_entry *entry)
{
struct ntb_payload_header __iomem *hdr;
struct dma_async_tx_descriptor *txd;
struct dma_chan *chan = qp->dma_chan;
struct dma_device *device;
size_t dest_off, buff_off;
dma_addr_t src, dest;
dma_cookie_t cookie;
void __iomem *offset;
size_t len = entry->len;
void *buf = entry->buf;
unsigned long flags;
offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index;
hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header);
entry->tx_hdr = hdr;
iowrite32(entry->len, &hdr->len);
iowrite32((u32) qp->tx_pkts, &hdr->ver);
if (!chan)
goto err;
if (len < copy_bytes)
goto err;
device = chan->device;
dest = qp->tx_mw_phys + qp->tx_max_frame * qp->tx_index;
buff_off = (size_t) buf & ~PAGE_MASK;
dest_off = (size_t) dest & ~PAGE_MASK;
if (!is_dma_copy_aligned(device, buff_off, dest_off, len))
goto err;
src = dma_map_single(device->dev, buf, len, DMA_TO_DEVICE);
if (dma_mapping_error(device->dev, src))
goto err;
flags = DMA_COMPL_SRC_UNMAP_SINGLE | DMA_PREP_INTERRUPT;
txd = device->device_prep_dma_memcpy(chan, dest, src, len, flags);
if (!txd)
goto err1;
txd->callback = ntb_tx_copy_callback;
txd->callback_param = entry;
cookie = dmaengine_submit(txd);
if (dma_submit_error(cookie))
goto err1;
dma_async_issue_pending(chan);
qp->tx_async++;
return;
err1:
dma_unmap_single(device->dev, src, len, DMA_TO_DEVICE);
err:
ntb_memcpy_tx(entry, offset);
qp->tx_memcpy++;
}
static int ntb_process_tx(struct ntb_transport_qp *qp,
struct ntb_queue_entry *entry)
{
void __iomem *offset;
offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index;
dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%lld - offset %p, tx %u, entry len %d flags %x buff %p\n",
qp->tx_pkts, offset, qp->tx_index, entry->len, entry->flags,
dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%lld - tx %u, entry len %d flags %x buff %p\n",
qp->tx_pkts, qp->tx_index, entry->len, entry->flags,
entry->buf);
if (qp->tx_index == qp->remote_rx_info->entry) {
qp->tx_ring_full++;
@ -1114,7 +1320,7 @@ static int ntb_process_tx(struct ntb_transport_qp *qp,
return 0;
}
ntb_tx_copy_task(qp, entry, offset);
ntb_async_tx(qp, entry);
qp->tx_index++;
qp->tx_index %= qp->tx_max_entry;
@ -1200,11 +1406,18 @@ ntb_transport_create_queue(void *data, struct pci_dev *pdev,
qp->tx_handler = handlers->tx_handler;
qp->event_handler = handlers->event_handler;
qp->dma_chan = dma_find_channel(DMA_MEMCPY);
if (!qp->dma_chan)
dev_info(&pdev->dev, "Unable to allocate DMA channel, using CPU instead\n");
else
dmaengine_get();
for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) {
entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC);
if (!entry)
goto err1;
entry->qp = qp;
ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry,
&qp->rx_free_q);
}
@ -1214,6 +1427,7 @@ ntb_transport_create_queue(void *data, struct pci_dev *pdev,
if (!entry)
goto err2;
entry->qp = qp;
ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry,
&qp->tx_free_q);
}
@ -1259,11 +1473,26 @@ void ntb_transport_free_queue(struct ntb_transport_qp *qp)
pdev = ntb_query_pdev(qp->ndev);
cancel_delayed_work_sync(&qp->link_work);
if (qp->dma_chan) {
struct dma_chan *chan = qp->dma_chan;
/* Putting the dma_chan to NULL will force any new traffic to be
* processed by the CPU instead of the DAM engine
*/
qp->dma_chan = NULL;
/* Try to be nice and wait for any queued DMA engine
* transactions to process before smashing it with a rock
*/
dma_sync_wait(chan, qp->last_cookie);
dmaengine_terminate_all(chan);
dmaengine_put();
}
ntb_unregister_db_callback(qp->ndev, qp->qp_num);
tasklet_disable(&qp->rx_work);
cancel_delayed_work_sync(&qp->link_work);
while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q)))
kfree(entry);
@ -1354,7 +1583,7 @@ EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue);
* @len: length of the data buffer
*
* Enqueue a new transmit buffer onto the transport queue from which a NTB
* payload will be transmitted. This assumes that a lock is behing held to
* payload will be transmitted. This assumes that a lock is being held to
* serialize access to the qp.
*
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
@ -1369,8 +1598,10 @@ int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data,
return -EINVAL;
entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q);
if (!entry)
if (!entry) {
qp->tx_err_no_buf++;
return -ENOMEM;
}
entry->cb_data = cb;
entry->buf = data;
@ -1410,7 +1641,7 @@ EXPORT_SYMBOL_GPL(ntb_transport_link_up);
*
* Notify NTB transport layer of client's desire to no longer receive data on
* transport queue specified. It is the client's responsibility to ensure all
* entries on queue are purged or otherwise handled appropraitely.
* entries on queue are purged or otherwise handled appropriately.
*/
void ntb_transport_link_down(struct ntb_transport_qp *qp)
{
@ -1486,9 +1717,18 @@ EXPORT_SYMBOL_GPL(ntb_transport_qp_num);
*/
unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp)
{
unsigned int max;
if (!qp)
return 0;
return qp->tx_max_frame - sizeof(struct ntb_payload_header);
if (!qp->dma_chan)
return qp->tx_max_frame - sizeof(struct ntb_payload_header);
/* If DMA engine usage is possible, try to find the max size for that */
max = qp->tx_max_frame - sizeof(struct ntb_payload_header);
max -= max % (1 << qp->dma_chan->device->copy_align);
return max;
}
EXPORT_SYMBOL_GPL(ntb_transport_max_size);