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Message-ID: <20180920213749.GC224714@bhelgaas-glaptop.roam.corp.google.com>
Date: Thu, 20 Sep 2018 16:37:49 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Jisheng Zhang <Jisheng.Zhang@...aptics.com>,
Joao Pinto <Joao.Pinto@...opsys.com>,
Jingoo Han <jingoohan1@...il.com>,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
Bjorn Helgaas <bhelgaas@...gle.com>,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3] PCI: dwc: fix scheduling while atomic issues
On Thu, Sep 13, 2018 at 04:05:54PM +0100, Lorenzo Pieralisi wrote:
> On Wed, Aug 29, 2018 at 11:04:08AM +0800, Jisheng Zhang wrote:
> > When programming inbound/outbound atu, we call usleep_range() after
> > each checking PCIE_ATU_ENABLE bit. Unfortunately, the atu programming
> > can be called in atomic context:
> >
> > inbound atu programming could be called through
> > pci_epc_write_header()
> > =>dw_pcie_ep_write_header()
> > =>dw_pcie_prog_inbound_atu()
> >
> > outbound atu programming could be called through
> > pci_bus_read_config_dword()
> > =>dw_pcie_rd_conf()
> > =>dw_pcie_prog_outbound_atu()
> >
> > Fix this issue by calling mdelay() instead.
> >
> > Fixes: f8aed6ec624f ("PCI: dwc: designware: Add EP mode support")
> > Fixes: d8bbeb39fbf3 ("PCI: designware: Wait for iATU enable")
> > Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
> > Acked-by: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
> > ---
>
> Applied to pci/controller-fixes aiming at one of the upcoming -rc*.
I cherry-picked this into for-linus for v4.19.
> > since v2:
> > - Add Fixes tag
> > - Add Gustavo's Ack
> >
> > since v1:
> > - use mdelay() instead of udelay() to avoid __bad_udelay()
> >
> > drivers/pci/controller/dwc/pcie-designware.c | 8 ++++----
> > drivers/pci/controller/dwc/pcie-designware.h | 3 +--
> > 2 files changed, 5 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> > index 778c4f76a884..2153956a0b20 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware.c
> > @@ -135,7 +135,7 @@ static void dw_pcie_prog_outbound_atu_unroll(struct dw_pcie *pci, int index,
> > if (val & PCIE_ATU_ENABLE)
> > return;
> >
> > - usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
> > + mdelay(LINK_WAIT_IATU);
> > }
> > dev_err(pci->dev, "Outbound iATU is not being enabled\n");
> > }
> > @@ -178,7 +178,7 @@ void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
> > if (val & PCIE_ATU_ENABLE)
> > return;
> >
> > - usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
> > + mdelay(LINK_WAIT_IATU);
> > }
> > dev_err(pci->dev, "Outbound iATU is not being enabled\n");
> > }
> > @@ -236,7 +236,7 @@ static int dw_pcie_prog_inbound_atu_unroll(struct dw_pcie *pci, int index,
> > if (val & PCIE_ATU_ENABLE)
> > return 0;
> >
> > - usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
> > + mdelay(LINK_WAIT_IATU);
> > }
> > dev_err(pci->dev, "Inbound iATU is not being enabled\n");
> >
> > @@ -282,7 +282,7 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int bar,
> > if (val & PCIE_ATU_ENABLE)
> > return 0;
> >
> > - usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
> > + mdelay(LINK_WAIT_IATU);
> > }
> > dev_err(pci->dev, "Inbound iATU is not being enabled\n");
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> > index 96126fd8403c..9f1a5e399b70 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware.h
> > +++ b/drivers/pci/controller/dwc/pcie-designware.h
> > @@ -26,8 +26,7 @@
> >
> > /* Parameters for the waiting for iATU enabled routine */
> > #define LINK_WAIT_MAX_IATU_RETRIES 5
> > -#define LINK_WAIT_IATU_MIN 9000
> > -#define LINK_WAIT_IATU_MAX 10000
> > +#define LINK_WAIT_IATU 9
> >
> > /* Synopsys-specific PCIe configuration registers */
> > #define PCIE_PORT_LINK_CONTROL 0x710
> > --
> > 2.18.0
> >
>
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