Skip to content

Commit

Permalink
NTB: Add parameters for Intel SNB B2B addresses
Browse files Browse the repository at this point in the history 
Add module parameters for the addresses to be used in B2B topology.

Signed-off-by: Allen Hubbe <[email protected]>
Signed-off-by: Jon Mason <[email protected]>
  • Loading branch information
@jonmason
Allen Hubbe authored and jonmason committed Jul 4, 2015
1 parent 2849b5d commit 42fefc8
Show file tree
Hide file tree
Showing 2 changed files with 68 additions and 19 deletions.
10 changes: 10 additions & 0 deletions Documentation/ntb.txt
View file
Original file line number Diff line number Diff line change
Expand Up @@ -56,3 +56,13 @@ Module Parameters:
* b2b\_mw\_share - If the peer ntb is to be accessed via a memory window, and if
the memory window is large enough, still allow the client to use the
second half of the memory window for address translation to the peer.
* snb\_b2b\_usd\_bar2\_addr64 - If using B2B topology on Xeon hardware, use this
64 bit address on the bus between the NTB devices for the window at
BAR2, on the upstream side of the link.
* snb\_b2b\_usd\_bar4\_addr64 - See *snb\_b2b\_bar2\_addr64*.
* snb\_b2b\_usd\_bar4\_addr32 - See *snb\_b2b\_bar2\_addr64*.
* snb\_b2b\_usd\_bar5\_addr32 - See *snb\_b2b\_bar2\_addr64*.
* snb\_b2b\_dsd\_bar2\_addr64 - See *snb\_b2b\_bar2\_addr64*.
* snb\_b2b\_dsd\_bar4\_addr64 - See *snb\_b2b\_bar2\_addr64*.
* snb\_b2b\_dsd\_bar4\_addr32 - See *snb\_b2b\_bar2\_addr64*.
* snb\_b2b\_dsd\_bar5\_addr32 - See *snb\_b2b\_bar2\_addr64*.
77 changes: 58 additions & 19 deletions drivers/ntb/hw/intel/ntb_hw_intel.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -72,20 +72,6 @@ MODULE_AUTHOR("Intel Corporation");
#define bar0_off(base, bar) ((base) + ((bar) << 2))
#define bar2_off(base, bar) bar0_off(base, (bar) - 2)

static int b2b_mw_idx = -1;
module_param(b2b_mw_idx, int, 0644);
MODULE_PARM_DESC(b2b_mw_idx, "Use this mw idx to access the peer ntb. A "
"value of zero or positive starts from first mw idx, and a "
"negative value starts from last mw idx. Both sides MUST "
"set the same value here!");

static unsigned int b2b_mw_share;
module_param(b2b_mw_share, uint, 0644);
MODULE_PARM_DESC(b2b_mw_share, "If the b2b mw is large enough, configure the "
"ntb so that the peer ntb only occupies the first half of "
"the mw, so the second half can still be used as a mw. Both "
"sides MUST set the same value here!");

static const struct intel_ntb_reg bwd_reg;
static const struct intel_ntb_alt_reg bwd_pri_reg;
static const struct intel_ntb_alt_reg bwd_sec_reg;
Expand All @@ -98,14 +84,67 @@ static const struct intel_ntb_alt_reg snb_sec_reg;
static const struct intel_ntb_alt_reg snb_b2b_reg;
static const struct intel_ntb_xlat_reg snb_pri_xlat;
static const struct intel_ntb_xlat_reg snb_sec_xlat;
static const struct intel_b2b_addr snb_b2b_usd_addr;
static const struct intel_b2b_addr snb_b2b_dsd_addr;

static struct intel_b2b_addr snb_b2b_usd_addr;
static struct intel_b2b_addr snb_b2b_dsd_addr;
static const struct ntb_dev_ops intel_ntb_ops;

static const struct file_operations intel_ntb_debugfs_info;
static struct dentry *debugfs_dir;

static int b2b_mw_idx = -1;
module_param(b2b_mw_idx, int, 0644);
MODULE_PARM_DESC(b2b_mw_idx, "Use this mw idx to access the peer ntb. A "
"value of zero or positive starts from first mw idx, and a "
"negative value starts from last mw idx. Both sides MUST "
"set the same value here!");

static unsigned int b2b_mw_share;
module_param(b2b_mw_share, uint, 0644);
MODULE_PARM_DESC(b2b_mw_share, "If the b2b mw is large enough, configure the "
"ntb so that the peer ntb only occupies the first half of "
"the mw, so the second half can still be used as a mw. Both "
"sides MUST set the same value here!");

module_param_named(snb_b2b_usd_bar2_addr64,
snb_b2b_usd_addr.bar2_addr64, ullong, 0644);
MODULE_PARM_DESC(snb_b2b_usd_bar2_addr64,
"SNB B2B USD BAR 2 64-bit address");

module_param_named(snb_b2b_usd_bar4_addr64,
snb_b2b_usd_addr.bar4_addr64, ullong, 0644);
MODULE_PARM_DESC(snb_b2b_usd_bar2_addr64,
"SNB B2B USD BAR 4 64-bit address");

module_param_named(snb_b2b_usd_bar4_addr32,
snb_b2b_usd_addr.bar4_addr32, ullong, 0644);
MODULE_PARM_DESC(snb_b2b_usd_bar2_addr64,
"SNB B2B USD split-BAR 4 32-bit address");

module_param_named(snb_b2b_usd_bar5_addr32,
snb_b2b_usd_addr.bar5_addr32, ullong, 0644);
MODULE_PARM_DESC(snb_b2b_usd_bar2_addr64,
"SNB B2B USD split-BAR 5 32-bit address");

module_param_named(snb_b2b_dsd_bar2_addr64,
snb_b2b_dsd_addr.bar2_addr64, ullong, 0644);
MODULE_PARM_DESC(snb_b2b_dsd_bar2_addr64,
"SNB B2B DSD BAR 2 64-bit address");

module_param_named(snb_b2b_dsd_bar4_addr64,
snb_b2b_dsd_addr.bar4_addr64, ullong, 0644);
MODULE_PARM_DESC(snb_b2b_dsd_bar2_addr64,
"SNB B2B DSD BAR 4 64-bit address");

module_param_named(snb_b2b_dsd_bar4_addr32,
snb_b2b_dsd_addr.bar4_addr32, ullong, 0644);
MODULE_PARM_DESC(snb_b2b_dsd_bar2_addr64,
"SNB B2B DSD split-BAR 4 32-bit address");

module_param_named(snb_b2b_dsd_bar5_addr32,
snb_b2b_dsd_addr.bar5_addr32, ullong, 0644);
MODULE_PARM_DESC(snb_b2b_dsd_bar2_addr64,
"SNB B2B DSD split-BAR 5 32-bit address");

#ifndef ioread64
#ifdef readq
#define ioread64 readq
Expand Down Expand Up @@ -2073,14 +2112,14 @@ static const struct intel_ntb_xlat_reg snb_sec_xlat = {
.bar2_xlat = SNB_SBAR23XLAT_OFFSET,
};

static const struct intel_b2b_addr snb_b2b_usd_addr = {
static struct intel_b2b_addr snb_b2b_usd_addr = {
.bar2_addr64 = SNB_B2B_BAR2_USD_ADDR64,
.bar4_addr64 = SNB_B2B_BAR4_USD_ADDR64,
.bar4_addr32 = SNB_B2B_BAR4_USD_ADDR32,
.bar5_addr32 = SNB_B2B_BAR5_USD_ADDR32,
};

static const struct intel_b2b_addr snb_b2b_dsd_addr = {
static struct intel_b2b_addr snb_b2b_dsd_addr = {
.bar2_addr64 = SNB_B2B_BAR2_DSD_ADDR64,
.bar4_addr64 = SNB_B2B_BAR4_DSD_ADDR64,
.bar4_addr32 = SNB_B2B_BAR4_DSD_ADDR32,
Expand Down

0 comments on commit 42fefc8

Please sign in to comment.