From b3695540ba5d8cf032f30533d53786b31af271f5 Mon Sep 17 00:00:00 2001 From: Hariprasad Shenai Date: Thu, 1 Oct 2015 13:48:46 +0530 Subject: cxgb4: For T4, don't read the Firmware Mailbox Control register T4 doesn't have the Shadow copy of the register which we can read without side effect. So don't read mbox control register for T4 adapter Signed-off-by: Hariprasad Shenai Signed-off-by: David S. Miller --- drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) (limited to 'drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c') diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c index 0a87a3247464..b4ace1940497 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c @@ -1128,18 +1128,26 @@ static const struct file_operations devlog_fops = { static int mbox_show(struct seq_file *seq, void *v) { static const char * const owner[] = { "none", "FW", "driver", - "unknown" }; + "unknown", "" }; int i; unsigned int mbox = (uintptr_t)seq->private & 7; struct adapter *adap = seq->private - mbox; void __iomem *addr = adap->regs + PF_REG(mbox, CIM_PF_MAILBOX_DATA_A); - unsigned int ctrl_reg = (is_t4(adap->params.chip) - ? CIM_PF_MAILBOX_CTRL_A - : CIM_PF_MAILBOX_CTRL_SHADOW_COPY_A); - void __iomem *ctrl = adap->regs + PF_REG(mbox, ctrl_reg); - i = MBOWNER_G(readl(ctrl)); + /* For T4 we don't have a shadow copy of the Mailbox Control register. + * And since reading that real register causes a side effect of + * granting ownership, we're best of simply not reading it at all. + */ + if (is_t4(adap->params.chip)) { + i = 4; /* index of "" */ + } else { + unsigned int ctrl_reg = CIM_PF_MAILBOX_CTRL_SHADOW_COPY_A; + void __iomem *ctrl = adap->regs + PF_REG(mbox, ctrl_reg); + + i = MBOWNER_G(readl(ctrl)); + } + seq_printf(seq, "mailbox owned by %s\n\n", owner[i]); for (i = 0; i < MBOX_LEN; i += 8) -- cgit v1.2.3-59-g8ed1b