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qed: Handle possible race in SB config 

Due to HW design, some of the memories are wide-bus and access to those
needs to be sequentialized on a per-HW-block level; Read/write to a
given HW-block might break other read/write to wide-bus memory done at
~same time.

Status blocks initialization in CAU is done into such a wide-bus memory.
This moves the initialization into using DMAE which is guaranteed to be
safe to use on such memories.

Signed-off-by: Yuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuval Mintz 2016-02-21 11:40:08 +02:00 committed by David S. Miller
parent 60fffb3b80
commit 0a0c5d3b81
1 changed files with 8 additions and 8 deletions
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16
drivers/net/ethernet/qlogic/qed/qed_int.c
View File

@ -473,20 +473,20 @@ void qed_int_cau_conf_sb(struct qed_hwfn *p_hwfn,
u8 vf_valid)
{
struct cau_sb_entry sb_entry;
u32 val;
qed_init_cau_sb_entry(p_hwfn, &sb_entry, p_hwfn->rel_pf_id,
vf_number, vf_valid);
if (p_hwfn->hw_init_done) {
val = CAU_REG_SB_ADDR_MEMORY + igu_sb_id * sizeof(u64);
qed_wr(p_hwfn, p_ptt, val, lower_32_bits(sb_phys));
qed_wr(p_hwfn, p_ptt, val + sizeof(u32),
upper_32_bits(sb_phys));
/* Wide-bus, initialize via DMAE */
u64 phys_addr = (u64)sb_phys;
val = CAU_REG_SB_VAR_MEMORY + igu_sb_id * sizeof(u64);
qed_wr(p_hwfn, p_ptt, val, sb_entry.data);
qed_wr(p_hwfn, p_ptt, val + sizeof(u32), sb_entry.params);
qed_dmae_host2grc(p_hwfn, p_ptt, (u64)(uintptr_t)&phys_addr,
CAU_REG_SB_ADDR_MEMORY +
igu_sb_id * sizeof(u64), 2, 0);
qed_dmae_host2grc(p_hwfn, p_ptt, (u64)(uintptr_t)&sb_entry,
CAU_REG_SB_VAR_MEMORY +
igu_sb_id * sizeof(u64), 2, 0);
} else {
/* Initialize Status Block Address */
STORE_RT_REG_AGG(p_hwfn,