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linux/drivers/scsi/bfa/bfa_ioc_cb.c
Vijaya Mohan Guvva c679b599af [SCSI] bfa: kdump fix on 815 and 825 adapters 
Root cause: When kernel crashes, On brocade 815/825 adapters,
 bfa IOC state machine and FW doesn't get a notification and
hence are not cleanly shutdown. So registers holding driver/IOC
state information are not reset back to valid disabled/parking
values. This causes subsequent driver initialization to fail
during kdump kernel boot.

Fix description: during the initialization of first PCI function, reset
corresponding register when unclean shutown is detect by reading chip
registers. This will make sure that ioc/fw gets clean re-initialization.

Signed-off-by: Vijaya Mohan Guvva <vmohan@brocade.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2013-06-26 13:12:19 -07:00

386 lines
11 KiB
C
Raw Blame History

/*
* Copyright (c) 2005-2010 Brocade Communications Systems, Inc.
* All rights reserved
* www.brocade.com
*
* Linux driver for Brocade Fibre Channel Host Bus Adapter.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License (GPL) Version 2 as
* published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#include "bfad_drv.h"
#include "bfa_ioc.h"
#include "bfi_reg.h"
#include "bfa_defs.h"
BFA_TRC_FILE(CNA, IOC_CB);
#define bfa_ioc_cb_join_pos(__ioc) ((u32) (1 << BFA_IOC_CB_JOIN_SH))
/*
* forward declarations
*/
static bfa_boolean_t bfa_ioc_cb_firmware_lock(struct bfa_ioc_s *ioc);
static void bfa_ioc_cb_firmware_unlock(struct bfa_ioc_s *ioc);
static void bfa_ioc_cb_reg_init(struct bfa_ioc_s *ioc);
static void bfa_ioc_cb_map_port(struct bfa_ioc_s *ioc);
static void bfa_ioc_cb_isr_mode_set(struct bfa_ioc_s *ioc, bfa_boolean_t msix);
static void bfa_ioc_cb_notify_fail(struct bfa_ioc_s *ioc);
static void bfa_ioc_cb_ownership_reset(struct bfa_ioc_s *ioc);
static bfa_boolean_t bfa_ioc_cb_sync_start(struct bfa_ioc_s *ioc);
static void bfa_ioc_cb_sync_join(struct bfa_ioc_s *ioc);
static void bfa_ioc_cb_sync_leave(struct bfa_ioc_s *ioc);
static void bfa_ioc_cb_sync_ack(struct bfa_ioc_s *ioc);
static bfa_boolean_t bfa_ioc_cb_sync_complete(struct bfa_ioc_s *ioc);
static void bfa_ioc_cb_set_cur_ioc_fwstate(
struct bfa_ioc_s *ioc, enum bfi_ioc_state fwstate);
static enum bfi_ioc_state bfa_ioc_cb_get_cur_ioc_fwstate(struct bfa_ioc_s *ioc);
static void bfa_ioc_cb_set_alt_ioc_fwstate(
struct bfa_ioc_s *ioc, enum bfi_ioc_state fwstate);
static enum bfi_ioc_state bfa_ioc_cb_get_alt_ioc_fwstate(struct bfa_ioc_s *ioc);
static struct bfa_ioc_hwif_s hwif_cb;
/*
* Called from bfa_ioc_attach() to map asic specific calls.
*/
void
bfa_ioc_set_cb_hwif(struct bfa_ioc_s *ioc)
{
hwif_cb.ioc_pll_init = bfa_ioc_cb_pll_init;
hwif_cb.ioc_firmware_lock = bfa_ioc_cb_firmware_lock;
hwif_cb.ioc_firmware_unlock = bfa_ioc_cb_firmware_unlock;
hwif_cb.ioc_reg_init = bfa_ioc_cb_reg_init;
hwif_cb.ioc_map_port = bfa_ioc_cb_map_port;
hwif_cb.ioc_isr_mode_set = bfa_ioc_cb_isr_mode_set;
hwif_cb.ioc_notify_fail = bfa_ioc_cb_notify_fail;
hwif_cb.ioc_ownership_reset = bfa_ioc_cb_ownership_reset;
hwif_cb.ioc_sync_start = bfa_ioc_cb_sync_start;
hwif_cb.ioc_sync_join = bfa_ioc_cb_sync_join;
hwif_cb.ioc_sync_leave = bfa_ioc_cb_sync_leave;
hwif_cb.ioc_sync_ack = bfa_ioc_cb_sync_ack;
hwif_cb.ioc_sync_complete = bfa_ioc_cb_sync_complete;
hwif_cb.ioc_set_fwstate = bfa_ioc_cb_set_cur_ioc_fwstate;
hwif_cb.ioc_get_fwstate = bfa_ioc_cb_get_cur_ioc_fwstate;
hwif_cb.ioc_set_alt_fwstate = bfa_ioc_cb_set_alt_ioc_fwstate;
hwif_cb.ioc_get_alt_fwstate = bfa_ioc_cb_get_alt_ioc_fwstate;
ioc->ioc_hwif = &hwif_cb;
}
/*
* Return true if firmware of current driver matches the running firmware.
*/
static bfa_boolean_t
bfa_ioc_cb_firmware_lock(struct bfa_ioc_s *ioc)
{
return BFA_TRUE;
}
static void
bfa_ioc_cb_firmware_unlock(struct bfa_ioc_s *ioc)
{
}
/*
* Notify other functions on HB failure.
*/
static void
bfa_ioc_cb_notify_fail(struct bfa_ioc_s *ioc)
{
writel(~0U, ioc->ioc_regs.err_set);
readl(ioc->ioc_regs.err_set);
}
/*
* Host to LPU mailbox message addresses
*/
static struct { u32 hfn_mbox, lpu_mbox, hfn_pgn; } iocreg_fnreg[] = {
{ HOSTFN0_LPU_MBOX0_0, LPU_HOSTFN0_MBOX0_0, HOST_PAGE_NUM_FN0 },
{ HOSTFN1_LPU_MBOX0_8, LPU_HOSTFN1_MBOX0_8, HOST_PAGE_NUM_FN1 }
};
/*
* Host <-> LPU mailbox command/status registers
*/
static struct { u32 hfn, lpu; } iocreg_mbcmd[] = {
{ HOSTFN0_LPU0_CMD_STAT, LPU0_HOSTFN0_CMD_STAT },
{ HOSTFN1_LPU1_CMD_STAT, LPU1_HOSTFN1_CMD_STAT }
};
static void
bfa_ioc_cb_reg_init(struct bfa_ioc_s *ioc)
{
void __iomem *rb;
int pcifn = bfa_ioc_pcifn(ioc);
rb = bfa_ioc_bar0(ioc);
ioc->ioc_regs.hfn_mbox = rb + iocreg_fnreg[pcifn].hfn_mbox;
ioc->ioc_regs.lpu_mbox = rb + iocreg_fnreg[pcifn].lpu_mbox;
ioc->ioc_regs.host_page_num_fn = rb + iocreg_fnreg[pcifn].hfn_pgn;
if (ioc->port_id == 0) {
ioc->ioc_regs.heartbeat = rb + BFA_IOC0_HBEAT_REG;
ioc->ioc_regs.ioc_fwstate = rb + BFA_IOC0_STATE_REG;
ioc->ioc_regs.alt_ioc_fwstate = rb + BFA_IOC1_STATE_REG;
} else {
ioc->ioc_regs.heartbeat = (rb + BFA_IOC1_HBEAT_REG);
ioc->ioc_regs.ioc_fwstate = (rb + BFA_IOC1_STATE_REG);
ioc->ioc_regs.alt_ioc_fwstate = (rb + BFA_IOC0_STATE_REG);
}
/*
* Host <-> LPU mailbox command/status registers
*/
ioc->ioc_regs.hfn_mbox_cmd = rb + iocreg_mbcmd[pcifn].hfn;
ioc->ioc_regs.lpu_mbox_cmd = rb + iocreg_mbcmd[pcifn].lpu;
/*
* PSS control registers
*/
ioc->ioc_regs.pss_ctl_reg = (rb + PSS_CTL_REG);
ioc->ioc_regs.pss_err_status_reg = (rb + PSS_ERR_STATUS_REG);
ioc->ioc_regs.app_pll_fast_ctl_reg = (rb + APP_PLL_LCLK_CTL_REG);
ioc->ioc_regs.app_pll_slow_ctl_reg = (rb + APP_PLL_SCLK_CTL_REG);
/*
* IOC semaphore registers and serialization
*/
ioc->ioc_regs.ioc_sem_reg = (rb + HOST_SEM0_REG);
ioc->ioc_regs.ioc_init_sem_reg = (rb + HOST_SEM2_REG);
/*
* sram memory access
*/
ioc->ioc_regs.smem_page_start = (rb + PSS_SMEM_PAGE_START);
ioc->ioc_regs.smem_pg0 = BFI_IOC_SMEM_PG0_CB;
/*
* err set reg : for notification of hb failure
*/
ioc->ioc_regs.err_set = (rb + ERR_SET_REG);
}
/*
* Initialize IOC to port mapping.
*/
static void
bfa_ioc_cb_map_port(struct bfa_ioc_s *ioc)
{
/*
* For crossbow, port id is same as pci function.
*/
ioc->port_id = bfa_ioc_pcifn(ioc);
bfa_trc(ioc, ioc->port_id);
}
/*
* Set interrupt mode for a function: INTX or MSIX
*/
static void
bfa_ioc_cb_isr_mode_set(struct bfa_ioc_s *ioc, bfa_boolean_t msix)
{
}
/*
* Synchronized IOC failure processing routines
*/
static bfa_boolean_t
bfa_ioc_cb_sync_start(struct bfa_ioc_s *ioc)
{
u32 ioc_fwstate = readl(ioc->ioc_regs.ioc_fwstate);
/**
* Driver load time. If the join bit is set,
* it is due to an unclean exit by the driver for this
* PCI fn in the previous incarnation. Whoever comes here first
* should clean it up, no matter which PCI fn.
*/
if (ioc_fwstate & BFA_IOC_CB_JOIN_MASK) {
writel(BFI_IOC_UNINIT, ioc->ioc_regs.ioc_fwstate);
writel(BFI_IOC_UNINIT, ioc->ioc_regs.alt_ioc_fwstate);
return BFA_TRUE;
}
return bfa_ioc_cb_sync_complete(ioc);
}
/*
* Cleanup hw semaphore and usecnt registers
*/
static void
bfa_ioc_cb_ownership_reset(struct bfa_ioc_s *ioc)
{
/*
* Read the hw sem reg to make sure that it is locked
* before we clear it. If it is not locked, writing 1
* will lock it instead of clearing it.
*/
readl(ioc->ioc_regs.ioc_sem_reg);
writel(1, ioc->ioc_regs.ioc_sem_reg);
}
/*
* Synchronized IOC failure processing routines
*/
static void
bfa_ioc_cb_sync_join(struct bfa_ioc_s *ioc)
{
u32 r32 = readl(ioc->ioc_regs.ioc_fwstate);
u32 join_pos = bfa_ioc_cb_join_pos(ioc);
writel((r32 | join_pos), ioc->ioc_regs.ioc_fwstate);
}
static void
bfa_ioc_cb_sync_leave(struct bfa_ioc_s *ioc)
{
u32 r32 = readl(ioc->ioc_regs.ioc_fwstate);
u32 join_pos = bfa_ioc_cb_join_pos(ioc);
writel((r32 & ~join_pos), ioc->ioc_regs.ioc_fwstate);
}
static void
bfa_ioc_cb_set_cur_ioc_fwstate(struct bfa_ioc_s *ioc,
enum bfi_ioc_state fwstate)
{
u32 r32 = readl(ioc->ioc_regs.ioc_fwstate);
writel((fwstate | (r32 & BFA_IOC_CB_JOIN_MASK)),
ioc->ioc_regs.ioc_fwstate);
}
static enum bfi_ioc_state
bfa_ioc_cb_get_cur_ioc_fwstate(struct bfa_ioc_s *ioc)
{
return (enum bfi_ioc_state)(readl(ioc->ioc_regs.ioc_fwstate) &
BFA_IOC_CB_FWSTATE_MASK);
}
static void
bfa_ioc_cb_set_alt_ioc_fwstate(struct bfa_ioc_s *ioc,
enum bfi_ioc_state fwstate)
{
u32 r32 = readl(ioc->ioc_regs.alt_ioc_fwstate);
writel((fwstate | (r32 & BFA_IOC_CB_JOIN_MASK)),
ioc->ioc_regs.alt_ioc_fwstate);
}
static enum bfi_ioc_state
bfa_ioc_cb_get_alt_ioc_fwstate(struct bfa_ioc_s *ioc)
{
return (enum bfi_ioc_state)(readl(ioc->ioc_regs.alt_ioc_fwstate) &
BFA_IOC_CB_FWSTATE_MASK);
}
static void
bfa_ioc_cb_sync_ack(struct bfa_ioc_s *ioc)
{
bfa_ioc_cb_set_cur_ioc_fwstate(ioc, BFI_IOC_FAIL);
}
static bfa_boolean_t
bfa_ioc_cb_sync_complete(struct bfa_ioc_s *ioc)
{
u32 fwstate, alt_fwstate;
fwstate = bfa_ioc_cb_get_cur_ioc_fwstate(ioc);
/*
* At this point, this IOC is hoding the hw sem in the
* start path (fwcheck) OR in the disable/enable path
* OR to check if the other IOC has acknowledged failure.
*
* So, this IOC can be in UNINIT, INITING, DISABLED, FAIL
* or in MEMTEST states. In a normal scenario, this IOC
* can not be in OP state when this function is called.
*
* However, this IOC could still be in OP state when
* the OS driver is starting up, if the OptROM code has
* left it in that state.
*
* If we had marked this IOC's fwstate as BFI_IOC_FAIL
* in the failure case and now, if the fwstate is not
* BFI_IOC_FAIL it implies that the other PCI fn have
* reinitialized the ASIC or this IOC got disabled, so
* return TRUE.
*/
if (fwstate == BFI_IOC_UNINIT ||
fwstate == BFI_IOC_INITING ||
fwstate == BFI_IOC_DISABLED ||
fwstate == BFI_IOC_MEMTEST ||
fwstate == BFI_IOC_OP)
return BFA_TRUE;
else {
alt_fwstate = bfa_ioc_cb_get_alt_ioc_fwstate(ioc);
if (alt_fwstate == BFI_IOC_FAIL ||
alt_fwstate == BFI_IOC_DISABLED ||
alt_fwstate == BFI_IOC_UNINIT ||
alt_fwstate == BFI_IOC_INITING ||
alt_fwstate == BFI_IOC_MEMTEST)
return BFA_TRUE;
else
return BFA_FALSE;
}
}
bfa_status_t
bfa_ioc_cb_pll_init(void __iomem *rb, enum bfi_asic_mode fcmode)
{
u32 pll_sclk, pll_fclk, join_bits;
pll_sclk = __APP_PLL_SCLK_ENABLE | __APP_PLL_SCLK_LRESETN |
__APP_PLL_SCLK_P0_1(3U) |
__APP_PLL_SCLK_JITLMT0_1(3U) |
__APP_PLL_SCLK_CNTLMT0_1(3U);
pll_fclk = __APP_PLL_LCLK_ENABLE | __APP_PLL_LCLK_LRESETN |
__APP_PLL_LCLK_RSEL200500 | __APP_PLL_LCLK_P0_1(3U) |
__APP_PLL_LCLK_JITLMT0_1(3U) |
__APP_PLL_LCLK_CNTLMT0_1(3U);
join_bits = readl(rb + BFA_IOC0_STATE_REG) &
BFA_IOC_CB_JOIN_MASK;
writel((BFI_IOC_UNINIT | join_bits), (rb + BFA_IOC0_STATE_REG));
join_bits = readl(rb + BFA_IOC1_STATE_REG) &
BFA_IOC_CB_JOIN_MASK;
writel((BFI_IOC_UNINIT | join_bits), (rb + BFA_IOC1_STATE_REG));
writel(0xffffffffU, (rb + HOSTFN0_INT_MSK));
writel(0xffffffffU, (rb + HOSTFN1_INT_MSK));
writel(0xffffffffU, (rb + HOSTFN0_INT_STATUS));
writel(0xffffffffU, (rb + HOSTFN1_INT_STATUS));
writel(0xffffffffU, (rb + HOSTFN0_INT_MSK));
writel(0xffffffffU, (rb + HOSTFN1_INT_MSK));
writel(__APP_PLL_SCLK_LOGIC_SOFT_RESET, rb + APP_PLL_SCLK_CTL_REG);
writel(__APP_PLL_SCLK_BYPASS | __APP_PLL_SCLK_LOGIC_SOFT_RESET,
rb + APP_PLL_SCLK_CTL_REG);
writel(__APP_PLL_LCLK_LOGIC_SOFT_RESET, rb + APP_PLL_LCLK_CTL_REG);
writel(__APP_PLL_LCLK_BYPASS | __APP_PLL_LCLK_LOGIC_SOFT_RESET,
rb + APP_PLL_LCLK_CTL_REG);
udelay(2);
writel(__APP_PLL_SCLK_LOGIC_SOFT_RESET, rb + APP_PLL_SCLK_CTL_REG);
writel(__APP_PLL_LCLK_LOGIC_SOFT_RESET, rb + APP_PLL_LCLK_CTL_REG);
writel(pll_sclk | __APP_PLL_SCLK_LOGIC_SOFT_RESET,
rb + APP_PLL_SCLK_CTL_REG);
writel(pll_fclk | __APP_PLL_LCLK_LOGIC_SOFT_RESET,
rb + APP_PLL_LCLK_CTL_REG);
udelay(2000);
writel(0xffffffffU, (rb + HOSTFN0_INT_STATUS));
writel(0xffffffffU, (rb + HOSTFN1_INT_STATUS));
writel(pll_sclk, (rb + APP_PLL_SCLK_CTL_REG));
writel(pll_fclk, (rb + APP_PLL_LCLK_CTL_REG));
return BFA_STATUS_OK;
}
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