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ntb_hw_switchtec: Added support of >=4G memory windows

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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>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Paul Selles 2018-12-06 21:30:52 +08:00 committed by Jon Mason
parent d123fab71f
commit a2585cdc9e
2 changed files with 12 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
drivers/ntb/hw/mscc/ntb_hw_switchtec.c
View file

@ -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 | (lower_32_bits(size) & 0xFFFFF000),
&ctl->bar_entry[bar].win_size);
iowrite32(upper_32_bits(size), &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 | (lower_32_bits(size) & 0xFFFFF000),
&ctl->bar_entry[bar].win_size);
iowrite32(upper_32_bits(size), &ctl->bar_ext_entry[bar].win_size);
iowrite64(sndev->peer_partition | addr,
&ctl->bar_entry[bar].xlate_addr);
}

6
include/linux/switchtec.h
View file

@ -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[512];
u32 reserved3[256];
u64 lut_entry[512];