[PATCH 0/3] ntb_hw_switchtec: Added support of >=4G memory windows

[PATCH 0/3] ntb_hw_switchtec: Added support of >=4G memory windows

[Wesley Sheng]

Hi, Everyone,

This patch series adds support of >=4G memory windows.

Current Switchtec's BAR setup registers are limited to 32bits,
corresponding to the maximum MW (memory window) size is <4G.
Increase the MW sizes with the addition of the BAR Setup Extension
Register for the upper 32bits of a 64bits MW size. This increases the MW
range to between 4K and 2^63.

Additionally, we've made the following changes:

* debug print 64bit aligned crosslink BAR numbers
* Fix the array size of NT req id mapping table

Tested with ntb_test.sh successfully based on NTB fixes series from
Logan Gunthorpe <logang@deltatee.com> at 
https://github.com/sbates130272/linux-p2pmem on branch of
ntb_multiport_fixes

Regards,
Wesley



Paul Selles (2):
  ntb_hw_switchtec: debug print 64bit aligned crosslink BAR Numbers
  ntb_hw_switchtec: Added support of >=4G memory windows

Wesley Sheng (1):
  ntb_hw_switchtec: NT req id mapping table register entry number should
    be 512

 drivers/ntb/hw/mscc/ntb_hw_switchtec.c | 11 ++++++++---
 include/linux/switchtec.h              | 10 +++++++---
 2 files changed, 15 insertions(+), 6 deletions(-)

-- 
2.7.4

[PATCH 1/3] ntb_hw_switchtec: debug print 64bit aligned crosslink BAR Numbers

[Wesley Sheng]

From: Paul Selles <paul.selles@microchip.com>

Switchtec NTB crosslink BARs are 64bit addressed but they are printed as
32bit addressed BARs. Fix debug log to increment the BAR numbers by 2 to
reflect the 64bit address alignment.

Signed-off-by: Paul Selles <paul.selles@microchip.com>
Signed-off-by: Wesley Sheng <wesley.sheng@microchip.com>
---
 drivers/ntb/hw/mscc/ntb_hw_switchtec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
index 5ee5f40..9916bc5 100644
--- a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
+++ b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
@@ -1120,7 +1120,7 @@ static int crosslink_enum_partition(struct switchtec_ntb *sndev,
 
 		dev_dbg(&sndev->stdev->dev,
 			"Crosslink BAR%d addr: %llx\n",
-			i, bar_addr);
+			i*2, bar_addr);
 
 		if (bar_addr != bar_space * i)
 			continue;
-- 
2.7.4

[PATCH 2/3] ntb_hw_switchtec: Added support of >=4G memory windows

[Wesley Sheng]

From: Paul Selles <paul.selles@microchip.com>

Current Switchtec's BAR setup registers are limited to 32bits,
corresponding to the maximum MW (memory window) size is <4G.

Increase the MW sizes with the addition of the BAR Setup Extension
Register for the upper 32bits of a 64bits MW size. This increases the MW
range to between 4K and 2^63.

Reported-by: Boris Glimcher <boris.glimcher@emc.com>
Signed-off-by: Paul Selles <paul.selles@microchip.com>
Signed-off-by: Wesley Sheng <wesley.sheng@microchip.com>
---
 drivers/ntb/hw/mscc/ntb_hw_switchtec.c | 9 +++++++--
 include/linux/switchtec.h              | 6 +++++-
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
index 9916bc5..32850fb 100644
--- a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
+++ b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
@@ -264,6 +264,7 @@ static void switchtec_ntb_mw_clr_direct(struct switchtec_ntb *sndev, int idx)
 	ctl_val &= ~NTB_CTRL_BAR_DIR_WIN_EN;
 	iowrite32(ctl_val, &ctl->bar_entry[bar].ctl);
 	iowrite32(0, &ctl->bar_entry[bar].win_size);
+	iowrite32(0, &ctl->bar_ext_entry[bar].win_size);
 	iowrite64(sndev->self_partition, &ctl->bar_entry[bar].xlate_addr);
 }
 
@@ -286,7 +287,9 @@ static void switchtec_ntb_mw_set_direct(struct switchtec_ntb *sndev, int idx,
 	ctl_val |= NTB_CTRL_BAR_DIR_WIN_EN;
 
 	iowrite32(ctl_val, &ctl->bar_entry[bar].ctl);
-	iowrite32(xlate_pos | size, &ctl->bar_entry[bar].win_size);
+	iowrite32(xlate_pos | (size & 0xFFFFF000),
+		  &ctl->bar_entry[bar].win_size);
+	iowrite32(size >> 32, &ctl->bar_ext_entry[bar].win_size);
 	iowrite64(sndev->self_partition | addr,
 		  &ctl->bar_entry[bar].xlate_addr);
 }
@@ -1053,7 +1056,9 @@ static int crosslink_setup_mws(struct switchtec_ntb *sndev, int ntb_lut_idx,
 		ctl_val |= NTB_CTRL_BAR_DIR_WIN_EN;
 
 		iowrite32(ctl_val, &ctl->bar_entry[bar].ctl);
-		iowrite32(xlate_pos | size, &ctl->bar_entry[bar].win_size);
+		iowrite32(xlate_pos | (size & 0xFFFFF000),
+			  &ctl->bar_entry[bar].win_size);
+		iowrite32(size >> 32, &ctl->bar_ext_entry[bar].win_size);
 		iowrite64(sndev->peer_partition | addr,
 			  &ctl->bar_entry[bar].xlate_addr);
 	}
diff --git a/include/linux/switchtec.h b/include/linux/switchtec.h
index eee0412..1e6e333 100644
--- a/include/linux/switchtec.h
+++ b/include/linux/switchtec.h
@@ -248,7 +248,11 @@ struct ntb_ctrl_regs {
 		u32 win_size;
 		u64 xlate_addr;
 	} bar_entry[6];
-	u32 reserved2[216];
+	struct {
+		u32 win_size;
+		u32 reserved[3];
+	} bar_ext_entry[6];
+	u32 reserved2[192];
 	u32 req_id_table[256];
 	u32 reserved3[512];
 	u64 lut_entry[512];
-- 
2.7.4

[PATCH 3/3] ntb_hw_switchtec: NT req id mapping table register entry number should be 512

[Wesley Sheng]

The number of available NT req id mapping table entries per NTB control
register is 512. The driver mistakenly limits the number to 256.

Fix the array size of NT req id mapping table.

Signed-off-by: Wesley Sheng <wesley.sheng@microchip.com>
---
 include/linux/switchtec.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/switchtec.h b/include/linux/switchtec.h
index 1e6e333..52a079b 100644
--- a/include/linux/switchtec.h
+++ b/include/linux/switchtec.h
@@ -253,8 +253,8 @@ struct ntb_ctrl_regs {
 		u32 reserved[3];
 	} bar_ext_entry[6];
 	u32 reserved2[192];
-	u32 req_id_table[256];
-	u32 reserved3[512];
+	u32 req_id_table[512];
+	u32 reserved3[256];
 	u64 lut_entry[512];
 } __packed;
 
-- 
2.7.4

Re: [PATCH 0/3] ntb_hw_switchtec: Added support of >=4G memory windows

[Logan Gunthorpe]

Hey,

This entire series looks good to me.

Reviewed-by: Logan Gunthorpe <logang@deltatee.com>

Logan

On 2018-11-22 2:01 a.m., Wesley Sheng wrote:
> Hi, Everyone,
> 
> This patch series adds support of >=4G memory windows.
> 
> Current Switchtec's BAR setup registers are limited to 32bits,
> corresponding to the maximum MW (memory window) size is <4G.
> Increase the MW sizes with the addition of the BAR Setup Extension
> Register for the upper 32bits of a 64bits MW size. This increases the MW
> range to between 4K and 2^63.
> 
> Additionally, we've made the following changes:
> 
> * debug print 64bit aligned crosslink BAR numbers
> * Fix the array size of NT req id mapping table
> 
> Tested with ntb_test.sh successfully based on NTB fixes series from
> Logan Gunthorpe <logang@deltatee.com> at 
> https://github.com/sbates130272/linux-p2pmem on branch of
> ntb_multiport_fixes
> 
> Regards,
> Wesley
> 
> 
> 
> Paul Selles (2):
>   ntb_hw_switchtec: debug print 64bit aligned crosslink BAR Numbers
>   ntb_hw_switchtec: Added support of >=4G memory windows
> 
> Wesley Sheng (1):
>   ntb_hw_switchtec: NT req id mapping table register entry number should
>     be 512
> 
>  drivers/ntb/hw/mscc/ntb_hw_switchtec.c | 11 ++++++++---
>  include/linux/switchtec.h              | 10 +++++++---
>  2 files changed, 15 insertions(+), 6 deletions(-)
> 

Re: [PATCH 2/3] ntb_hw_switchtec: Added support of >=4G memory windows

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 2178 bytes --]

Hi Paul,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v4.20-rc3 next-20181123]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Wesley-Sheng/ntb_hw_switchtec-Added-support-of-4G-memory-windows/20181123-231700
config: i386-randconfig-x077-201846 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   drivers/ntb/hw/mscc/ntb_hw_switchtec.c: In function 'switchtec_ntb_mw_set_direct':
>> drivers/ntb/hw/mscc/ntb_hw_switchtec.c:292:17: warning: right shift count >= width of type [-Wshift-count-overflow]
     iowrite32(size >> 32, &ctl->bar_ext_entry[bar].win_size);
                    ^~
   drivers/ntb/hw/mscc/ntb_hw_switchtec.c: In function 'crosslink_setup_mws':
   drivers/ntb/hw/mscc/ntb_hw_switchtec.c:1061:18: warning: right shift count >= width of type [-Wshift-count-overflow]
      iowrite32(size >> 32, &ctl->bar_ext_entry[bar].win_size);
                     ^~

vim +292 drivers/ntb/hw/mscc/ntb_hw_switchtec.c

   277	
   278	static void switchtec_ntb_mw_set_direct(struct switchtec_ntb *sndev, int idx,
   279						dma_addr_t addr, resource_size_t size)
   280	{
   281		int xlate_pos = ilog2(size);
   282		int bar = sndev->peer_direct_mw_to_bar[idx];
   283		struct ntb_ctrl_regs __iomem *ctl = sndev->mmio_peer_ctrl;
   284		u32 ctl_val;
   285	
   286		ctl_val = ioread32(&ctl->bar_entry[bar].ctl);
   287		ctl_val |= NTB_CTRL_BAR_DIR_WIN_EN;
   288	
   289		iowrite32(ctl_val, &ctl->bar_entry[bar].ctl);
   290		iowrite32(xlate_pos | (size & 0xFFFFF000),
   291			  &ctl->bar_entry[bar].win_size);
 > 292		iowrite32(size >> 32, &ctl->bar_ext_entry[bar].win_size);
   293		iowrite64(sndev->self_partition | addr,
   294			  &ctl->bar_entry[bar].xlate_addr);
   295	}
   296	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 31802 bytes --]

Re: [PATCH 2/3] ntb_hw_switchtec: Added support of >=4G memory windows

[Jon Mason]

On Wed, Nov 21, 2018 at 9:19 PM Wesley Sheng <wesley.sheng@microchip.com> wrote:
>
> From: Paul Selles <paul.selles@microchip.com>
>
> Current Switchtec's BAR setup registers are limited to 32bits,
> corresponding to the maximum MW (memory window) size is <4G.
>
> Increase the MW sizes with the addition of the BAR Setup Extension
> Register for the upper 32bits of a 64bits MW size. This increases the MW
> range to between 4K and 2^63.
>
> Reported-by: Boris Glimcher <boris.glimcher@emc.com>
> Signed-off-by: Paul Selles <paul.selles@microchip.com>
> Signed-off-by: Wesley Sheng <wesley.sheng@microchip.com>
> ---
>  drivers/ntb/hw/mscc/ntb_hw_switchtec.c | 9 +++++++--
>  include/linux/switchtec.h              | 6 +++++-
>  2 files changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
> index 9916bc5..32850fb 100644
> --- a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
> +++ b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
> @@ -264,6 +264,7 @@ static void switchtec_ntb_mw_clr_direct(struct switchtec_ntb *sndev, int idx)
>         ctl_val &= ~NTB_CTRL_BAR_DIR_WIN_EN;
>         iowrite32(ctl_val, &ctl->bar_entry[bar].ctl);
>         iowrite32(0, &ctl->bar_entry[bar].win_size);
> +       iowrite32(0, &ctl->bar_ext_entry[bar].win_size);
>         iowrite64(sndev->self_partition, &ctl->bar_entry[bar].xlate_addr);
>  }
>
> @@ -286,7 +287,9 @@ static void switchtec_ntb_mw_set_direct(struct switchtec_ntb *sndev, int idx,
>         ctl_val |= NTB_CTRL_BAR_DIR_WIN_EN;
>
>         iowrite32(ctl_val, &ctl->bar_entry[bar].ctl);
> -       iowrite32(xlate_pos | size, &ctl->bar_entry[bar].win_size);
> +       iowrite32(xlate_pos | (size & 0xFFFFF000),
> +                 &ctl->bar_entry[bar].win_size);
> +       iowrite32(size >> 32, &ctl->bar_ext_entry[bar].win_size);

Thanks for the patches.  Overall the look good.  Per the kbuild email,
size_t is 32bits on 32bit arch.  So, this is going to have compile
warnings on those.  Please address this and resubmit.

Also, patches 1 and 3 are bug fixes.  Please do the following, reorder
the patches to make the bug fixes first and add a "Fixes" line to the
commit messages (see
https://www.kernel.org/doc/html/latest/process/submitting-patches.html#using-reported-by-tested-by-reviewed-by-suggested-by-and-fixes).
This will allow me to split up the series and get the bug fixes into
v4.20 (and the stable trees).

Thanks,
Jon

>         iowrite64(sndev->self_partition | addr,
>                   &ctl->bar_entry[bar].xlate_addr);
>  }
> @@ -1053,7 +1056,9 @@ static int crosslink_setup_mws(struct switchtec_ntb *sndev, int ntb_lut_idx,
>                 ctl_val |= NTB_CTRL_BAR_DIR_WIN_EN;
>
>                 iowrite32(ctl_val, &ctl->bar_entry[bar].ctl);
> -               iowrite32(xlate_pos | size, &ctl->bar_entry[bar].win_size);
> +               iowrite32(xlate_pos | (size & 0xFFFFF000),
> +                         &ctl->bar_entry[bar].win_size);
> +               iowrite32(size >> 32, &ctl->bar_ext_entry[bar].win_size);
>                 iowrite64(sndev->peer_partition | addr,
>                           &ctl->bar_entry[bar].xlate_addr);
>         }
> diff --git a/include/linux/switchtec.h b/include/linux/switchtec.h
> index eee0412..1e6e333 100644
> --- a/include/linux/switchtec.h
> +++ b/include/linux/switchtec.h
> @@ -248,7 +248,11 @@ struct ntb_ctrl_regs {
>                 u32 win_size;
>                 u64 xlate_addr;
>         } bar_entry[6];
> -       u32 reserved2[216];
> +       struct {
> +               u32 win_size;
> +               u32 reserved[3];
> +       } bar_ext_entry[6];
> +       u32 reserved2[192];
>         u32 req_id_table[256];
>         u32 reserved3[512];
>         u64 lut_entry[512];
> --
> 2.7.4
>