* [PATCH v3] PCI: dwc: fix scheduling while atomic issues
@ 2018-08-29 3:04 ` Jisheng Zhang
0 siblings, 0 replies; 19+ messages in thread
From: Jisheng Zhang @ 2018-08-29 3:04 UTC (permalink / raw)
To: Jingoo Han, Joao Pinto, Bjorn Helgaas, Lorenzo Pieralisi,
linux-pci, linux-kernel, linux-arm-kernel
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@synaptics.com>
Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
---
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
^ permalink raw reply related [flat|nested] 19+ messages in thread
* [PATCH v3] PCI: dwc: fix scheduling while atomic issues
@ 2018-08-29 3:04 ` Jisheng Zhang
0 siblings, 0 replies; 19+ messages in thread
From: Jisheng Zhang @ 2018-08-29 3:04 UTC (permalink / raw)
To: Jingoo Han, Joao Pinto, Bjorn Helgaas, Lorenzo Pieralisi,
linux-pci, linux-kernel, linux-arm-kernel
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@synaptics.com>
Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
---
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
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 19+ messages in thread
* [PATCH v3] PCI: dwc: fix scheduling while atomic issues
@ 2018-08-29 3:04 ` Jisheng Zhang
0 siblings, 0 replies; 19+ messages in thread
From: Jisheng Zhang @ 2018-08-29 3:04 UTC (permalink / raw)
To: linux-arm-kernel
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@synaptics.com>
Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
---
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
^ permalink raw reply related [flat|nested] 19+ messages in thread
* Re: [PATCH v3] PCI: dwc: fix scheduling while atomic issues
2018-08-29 3:04 ` Jisheng Zhang
(?)
@ 2018-09-10 8:57 ` Jisheng Zhang
-1 siblings, 0 replies; 19+ messages in thread
From: Jisheng Zhang @ 2018-09-10 8:57 UTC (permalink / raw)
To: Jingoo Han, Joao Pinto, Bjorn Helgaas, Lorenzo Pieralisi,
linux-pci, linux-kernel, linux-arm-kernel
Hi all,
On Wed, 29 Aug 2018 11:04:08 +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.
Any comments about this patch?
Thanks,
Jisheng
>
> Fixes: f8aed6ec624f ("PCI: dwc: designware: Add EP mode support")
> Fixes: d8bbeb39fbf3 ("PCI: designware: Wait for iATU enable")
> Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
> Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> ---
>
> 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
^ permalink raw reply [flat|nested] 19+ messages in thread
* Re: [PATCH v3] PCI: dwc: fix scheduling while atomic issues
@ 2018-09-10 8:57 ` Jisheng Zhang
0 siblings, 0 replies; 19+ messages in thread
From: Jisheng Zhang @ 2018-09-10 8:57 UTC (permalink / raw)
To: Jingoo Han, Joao Pinto, Bjorn Helgaas, Lorenzo Pieralisi,
linux-pci, linux-kernel, linux-arm-kernel
Hi all,
On Wed, 29 Aug 2018 11:04:08 +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.
Any comments about this patch?
Thanks,
Jisheng
>
> Fixes: f8aed6ec624f ("PCI: dwc: designware: Add EP mode support")
> Fixes: d8bbeb39fbf3 ("PCI: designware: Wait for iATU enable")
> Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
> Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> ---
>
> 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
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 19+ messages in thread
* [PATCH v3] PCI: dwc: fix scheduling while atomic issues
@ 2018-09-10 8:57 ` Jisheng Zhang
0 siblings, 0 replies; 19+ messages in thread
From: Jisheng Zhang @ 2018-09-10 8:57 UTC (permalink / raw)
To: linux-arm-kernel
Hi all,
On Wed, 29 Aug 2018 11:04:08 +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.
Any comments about this patch?
Thanks,
Jisheng
>
> Fixes: f8aed6ec624f ("PCI: dwc: designware: Add EP mode support")
> Fixes: d8bbeb39fbf3 ("PCI: designware: Wait for iATU enable")
> Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
> Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> ---
>
> 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
^ permalink raw reply [flat|nested] 19+ messages in thread
* Re: [PATCH v3] PCI: dwc: fix scheduling while atomic issues
2018-09-10 8:57 ` Jisheng Zhang
@ 2018-09-13 9:15 ` Lorenzo Pieralisi
-1 siblings, 0 replies; 19+ messages in thread
From: Lorenzo Pieralisi @ 2018-09-13 9:15 UTC (permalink / raw)
To: Jisheng Zhang
Cc: Jingoo Han, Joao Pinto, Bjorn Helgaas, linux-pci, linux-kernel,
linux-arm-kernel
On Mon, Sep 10, 2018 at 04:57:22PM +0800, Jisheng Zhang wrote:
> Hi all,
>
> On Wed, 29 Aug 2018 11:04:08 +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.
>
> Any comments about this patch?
>
> Thanks,
> Jisheng
>
> >
> > Fixes: f8aed6ec624f ("PCI: dwc: designware: Add EP mode support")
> > Fixes: d8bbeb39fbf3 ("PCI: designware: Wait for iATU enable")
Can you split it into two patches and repost it please ? It will make
everyone's life easier to backport it if there is need, I will apply
then.
Thanks,
Lorenzo
> > Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
> > Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> > ---
> >
> > 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
>
^ permalink raw reply [flat|nested] 19+ messages in thread
* [PATCH v3] PCI: dwc: fix scheduling while atomic issues
@ 2018-09-13 9:15 ` Lorenzo Pieralisi
0 siblings, 0 replies; 19+ messages in thread
From: Lorenzo Pieralisi @ 2018-09-13 9:15 UTC (permalink / raw)
To: linux-arm-kernel
On Mon, Sep 10, 2018 at 04:57:22PM +0800, Jisheng Zhang wrote:
> Hi all,
>
> On Wed, 29 Aug 2018 11:04:08 +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.
>
> Any comments about this patch?
>
> Thanks,
> Jisheng
>
> >
> > Fixes: f8aed6ec624f ("PCI: dwc: designware: Add EP mode support")
> > Fixes: d8bbeb39fbf3 ("PCI: designware: Wait for iATU enable")
Can you split it into two patches and repost it please ? It will make
everyone's life easier to backport it if there is need, I will apply
then.
Thanks,
Lorenzo
> > Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
> > Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> > ---
> >
> > 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
>
^ permalink raw reply [flat|nested] 19+ messages in thread
* Re: [PATCH v3] PCI: dwc: fix scheduling while atomic issues
2018-09-13 9:15 ` Lorenzo Pieralisi
(?)
@ 2018-09-13 10:29 ` Jisheng Zhang
-1 siblings, 0 replies; 19+ messages in thread
From: Jisheng Zhang @ 2018-09-13 10:29 UTC (permalink / raw)
To: Lorenzo Pieralisi
Cc: Jingoo Han, Joao Pinto, Bjorn Helgaas, linux-pci, linux-kernel,
linux-arm-kernel
Hi Lorenzo,
On Thu, 13 Sep 2018 10:15:34 +0100 Lorenzo Pieralisi wrote:
> On Mon, Sep 10, 2018 at 04:57:22PM +0800, Jisheng Zhang wrote:
> > Hi all,
> >
> > On Wed, 29 Aug 2018 11:04:08 +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.
> >
> > Any comments about this patch?
> >
> > Thanks,
> > Jisheng
> >
> > >
> > > Fixes: f8aed6ec624f ("PCI: dwc: designware: Add EP mode support")
> > > Fixes: d8bbeb39fbf3 ("PCI: designware: Wait for iATU enable")
>
> Can you split it into two patches and repost it please ? It will make
> everyone's life easier to backport it if there is need, I will apply
> then.
IIUC, the purpose of this split is to make the backport to stable easier. If
so, I realise that the Fixes tags were not enough, we missed:
Fixes: edd45e396829 ("PCI: dwc: designware: Move _unroll configurations to a
separate function")
I'm not sure how to handle this case. From another side, the issue to be
fixed is the same: call sleep in atomic context in the same driver, is it
better to use one patch?
As for stable tree, I could send out separate patches instead. What do you
think?
Thanks,
Jisheng
^ permalink raw reply [flat|nested] 19+ messages in thread
* Re: [PATCH v3] PCI: dwc: fix scheduling while atomic issues
@ 2018-09-13 10:29 ` Jisheng Zhang
0 siblings, 0 replies; 19+ messages in thread
From: Jisheng Zhang @ 2018-09-13 10:29 UTC (permalink / raw)
To: Lorenzo Pieralisi
Cc: Joao Pinto, Jingoo Han, linux-kernel, linux-pci, Bjorn Helgaas,
linux-arm-kernel
Hi Lorenzo,
On Thu, 13 Sep 2018 10:15:34 +0100 Lorenzo Pieralisi wrote:
> On Mon, Sep 10, 2018 at 04:57:22PM +0800, Jisheng Zhang wrote:
> > Hi all,
> >
> > On Wed, 29 Aug 2018 11:04:08 +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.
> >
> > Any comments about this patch?
> >
> > Thanks,
> > Jisheng
> >
> > >
> > > Fixes: f8aed6ec624f ("PCI: dwc: designware: Add EP mode support")
> > > Fixes: d8bbeb39fbf3 ("PCI: designware: Wait for iATU enable")
>
> Can you split it into two patches and repost it please ? It will make
> everyone's life easier to backport it if there is need, I will apply
> then.
IIUC, the purpose of this split is to make the backport to stable easier. If
so, I realise that the Fixes tags were not enough, we missed:
Fixes: edd45e396829 ("PCI: dwc: designware: Move _unroll configurations to a
separate function")
I'm not sure how to handle this case. From another side, the issue to be
fixed is the same: call sleep in atomic context in the same driver, is it
better to use one patch?
As for stable tree, I could send out separate patches instead. What do you
think?
Thanks,
Jisheng
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 19+ messages in thread
* [PATCH v3] PCI: dwc: fix scheduling while atomic issues
@ 2018-09-13 10:29 ` Jisheng Zhang
0 siblings, 0 replies; 19+ messages in thread
From: Jisheng Zhang @ 2018-09-13 10:29 UTC (permalink / raw)
To: linux-arm-kernel
Hi Lorenzo,
On Thu, 13 Sep 2018 10:15:34 +0100 Lorenzo Pieralisi wrote:
> On Mon, Sep 10, 2018 at 04:57:22PM +0800, Jisheng Zhang wrote:
> > Hi all,
> >
> > On Wed, 29 Aug 2018 11:04:08 +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.
> >
> > Any comments about this patch?
> >
> > Thanks,
> > Jisheng
> >
> > >
> > > Fixes: f8aed6ec624f ("PCI: dwc: designware: Add EP mode support")
> > > Fixes: d8bbeb39fbf3 ("PCI: designware: Wait for iATU enable")
>
> Can you split it into two patches and repost it please ? It will make
> everyone's life easier to backport it if there is need, I will apply
> then.
IIUC, the purpose of this split is to make the backport to stable easier. If
so, I realise that the Fixes tags were not enough, we missed:
Fixes: edd45e396829 ("PCI: dwc: designware: Move _unroll configurations to a
separate function")
I'm not sure how to handle this case. From another side, the issue to be
fixed is the same: call sleep in atomic context in the same driver, is it
better to use one patch?
As for stable tree, I could send out separate patches instead. What do you
think?
Thanks,
Jisheng
^ permalink raw reply [flat|nested] 19+ messages in thread
* Re: [PATCH v3] PCI: dwc: fix scheduling while atomic issues
2018-09-13 10:29 ` Jisheng Zhang
(?)
@ 2018-09-13 10:49 ` Lorenzo Pieralisi
-1 siblings, 0 replies; 19+ messages in thread
From: Lorenzo Pieralisi @ 2018-09-13 10:49 UTC (permalink / raw)
To: Jisheng Zhang
Cc: Jingoo Han, Joao Pinto, Bjorn Helgaas, linux-pci, linux-kernel,
linux-arm-kernel
On Thu, Sep 13, 2018 at 06:29:54PM +0800, Jisheng Zhang wrote:
> Hi Lorenzo,
>
> On Thu, 13 Sep 2018 10:15:34 +0100 Lorenzo Pieralisi wrote:
>
> > On Mon, Sep 10, 2018 at 04:57:22PM +0800, Jisheng Zhang wrote:
> > > Hi all,
> > >
> > > On Wed, 29 Aug 2018 11:04:08 +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.
> > >
> > > Any comments about this patch?
> > >
> > > Thanks,
> > > Jisheng
> > >
> > > >
> > > > Fixes: f8aed6ec624f ("PCI: dwc: designware: Add EP mode support")
> > > > Fixes: d8bbeb39fbf3 ("PCI: designware: Wait for iATU enable")
> >
> > Can you split it into two patches and repost it please ? It will make
> > everyone's life easier to backport it if there is need, I will apply
> > then.
>
> IIUC, the purpose of this split is to make the backport to stable easier. If
> so, I realise that the Fixes tags were not enough, we missed:
>
> Fixes: edd45e396829 ("PCI: dwc: designware: Move _unroll configurations to a
> separate function")
>
> I'm not sure how to handle this case. From another side, the issue to be
> fixed is the same: call sleep in atomic context in the same driver, is it
> better to use one patch?
>
> As for stable tree, I could send out separate patches instead. What do you
> think?
OK, I will merge the patch as-is and we will handle the stable backports
when Greg sends the patches out.
Lorenzo
^ permalink raw reply [flat|nested] 19+ messages in thread
* Re: [PATCH v3] PCI: dwc: fix scheduling while atomic issues
@ 2018-09-13 10:49 ` Lorenzo Pieralisi
0 siblings, 0 replies; 19+ messages in thread
From: Lorenzo Pieralisi @ 2018-09-13 10:49 UTC (permalink / raw)
To: Jisheng Zhang
Cc: Joao Pinto, Jingoo Han, linux-kernel, linux-pci, Bjorn Helgaas,
linux-arm-kernel
On Thu, Sep 13, 2018 at 06:29:54PM +0800, Jisheng Zhang wrote:
> Hi Lorenzo,
>
> On Thu, 13 Sep 2018 10:15:34 +0100 Lorenzo Pieralisi wrote:
>
> > On Mon, Sep 10, 2018 at 04:57:22PM +0800, Jisheng Zhang wrote:
> > > Hi all,
> > >
> > > On Wed, 29 Aug 2018 11:04:08 +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.
> > >
> > > Any comments about this patch?
> > >
> > > Thanks,
> > > Jisheng
> > >
> > > >
> > > > Fixes: f8aed6ec624f ("PCI: dwc: designware: Add EP mode support")
> > > > Fixes: d8bbeb39fbf3 ("PCI: designware: Wait for iATU enable")
> >
> > Can you split it into two patches and repost it please ? It will make
> > everyone's life easier to backport it if there is need, I will apply
> > then.
>
> IIUC, the purpose of this split is to make the backport to stable easier. If
> so, I realise that the Fixes tags were not enough, we missed:
>
> Fixes: edd45e396829 ("PCI: dwc: designware: Move _unroll configurations to a
> separate function")
>
> I'm not sure how to handle this case. From another side, the issue to be
> fixed is the same: call sleep in atomic context in the same driver, is it
> better to use one patch?
>
> As for stable tree, I could send out separate patches instead. What do you
> think?
OK, I will merge the patch as-is and we will handle the stable backports
when Greg sends the patches out.
Lorenzo
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 19+ messages in thread
* [PATCH v3] PCI: dwc: fix scheduling while atomic issues
@ 2018-09-13 10:49 ` Lorenzo Pieralisi
0 siblings, 0 replies; 19+ messages in thread
From: Lorenzo Pieralisi @ 2018-09-13 10:49 UTC (permalink / raw)
To: linux-arm-kernel
On Thu, Sep 13, 2018 at 06:29:54PM +0800, Jisheng Zhang wrote:
> Hi Lorenzo,
>
> On Thu, 13 Sep 2018 10:15:34 +0100 Lorenzo Pieralisi wrote:
>
> > On Mon, Sep 10, 2018 at 04:57:22PM +0800, Jisheng Zhang wrote:
> > > Hi all,
> > >
> > > On Wed, 29 Aug 2018 11:04:08 +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.
> > >
> > > Any comments about this patch?
> > >
> > > Thanks,
> > > Jisheng
> > >
> > > >
> > > > Fixes: f8aed6ec624f ("PCI: dwc: designware: Add EP mode support")
> > > > Fixes: d8bbeb39fbf3 ("PCI: designware: Wait for iATU enable")
> >
> > Can you split it into two patches and repost it please ? It will make
> > everyone's life easier to backport it if there is need, I will apply
> > then.
>
> IIUC, the purpose of this split is to make the backport to stable easier. If
> so, I realise that the Fixes tags were not enough, we missed:
>
> Fixes: edd45e396829 ("PCI: dwc: designware: Move _unroll configurations to a
> separate function")
>
> I'm not sure how to handle this case. From another side, the issue to be
> fixed is the same: call sleep in atomic context in the same driver, is it
> better to use one patch?
>
> As for stable tree, I could send out separate patches instead. What do you
> think?
OK, I will merge the patch as-is and we will handle the stable backports
when Greg sends the patches out.
Lorenzo
^ permalink raw reply [flat|nested] 19+ messages in thread
* Re: [PATCH v3] PCI: dwc: fix scheduling while atomic issues
2018-08-29 3:04 ` Jisheng Zhang
(?)
@ 2018-09-13 15:05 ` Lorenzo Pieralisi
-1 siblings, 0 replies; 19+ messages in thread
From: Lorenzo Pieralisi @ 2018-09-13 15:05 UTC (permalink / raw)
To: Jisheng Zhang
Cc: Jingoo Han, Joao Pinto, Bjorn Helgaas, linux-pci, linux-kernel,
linux-arm-kernel
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@synaptics.com>
> Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> ---
Applied to pci/controller-fixes aiming at one of the upcoming -rc*.
Thanks,
Lorenzo
> 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
>
^ permalink raw reply [flat|nested] 19+ messages in thread
* Re: [PATCH v3] PCI: dwc: fix scheduling while atomic issues
@ 2018-09-13 15:05 ` Lorenzo Pieralisi
0 siblings, 0 replies; 19+ messages in thread
From: Lorenzo Pieralisi @ 2018-09-13 15:05 UTC (permalink / raw)
To: Jisheng Zhang
Cc: Joao Pinto, Jingoo Han, linux-kernel, linux-pci, Bjorn Helgaas,
linux-arm-kernel
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@synaptics.com>
> Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> ---
Applied to pci/controller-fixes aiming at one of the upcoming -rc*.
Thanks,
Lorenzo
> 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
>
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 19+ messages in thread
* [PATCH v3] PCI: dwc: fix scheduling while atomic issues
@ 2018-09-13 15:05 ` Lorenzo Pieralisi
0 siblings, 0 replies; 19+ messages in thread
From: Lorenzo Pieralisi @ 2018-09-13 15:05 UTC (permalink / raw)
To: linux-arm-kernel
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@synaptics.com>
> Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> ---
Applied to pci/controller-fixes aiming at one of the upcoming -rc*.
Thanks,
Lorenzo
> 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
>
^ permalink raw reply [flat|nested] 19+ messages in thread
* Re: [PATCH v3] PCI: dwc: fix scheduling while atomic issues
2018-09-13 15:05 ` Lorenzo Pieralisi
@ 2018-09-20 21:37 ` Bjorn Helgaas
-1 siblings, 0 replies; 19+ messages in thread
From: Bjorn Helgaas @ 2018-09-20 21:37 UTC (permalink / raw)
To: Lorenzo Pieralisi
Cc: Jisheng Zhang, Joao Pinto, Jingoo Han, linux-kernel, linux-pci,
Bjorn Helgaas, linux-arm-kernel
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@synaptics.com>
> > Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.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
> >
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 19+ messages in thread
* [PATCH v3] PCI: dwc: fix scheduling while atomic issues
@ 2018-09-20 21:37 ` Bjorn Helgaas
0 siblings, 0 replies; 19+ messages in thread
From: Bjorn Helgaas @ 2018-09-20 21:37 UTC (permalink / raw)
To: linux-arm-kernel
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@synaptics.com>
> > Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.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
> >
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 19+ messages in thread
end of thread, other threads:[~2018-09-20 21:37 UTC | newest]
Thread overview: 19+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-08-29 3:04 [PATCH v3] PCI: dwc: fix scheduling while atomic issues Jisheng Zhang
2018-08-29 3:04 ` Jisheng Zhang
2018-08-29 3:04 ` Jisheng Zhang
2018-09-10 8:57 ` Jisheng Zhang
2018-09-10 8:57 ` Jisheng Zhang
2018-09-10 8:57 ` Jisheng Zhang
2018-09-13 9:15 ` Lorenzo Pieralisi
2018-09-13 9:15 ` Lorenzo Pieralisi
2018-09-13 10:29 ` Jisheng Zhang
2018-09-13 10:29 ` Jisheng Zhang
2018-09-13 10:29 ` Jisheng Zhang
2018-09-13 10:49 ` Lorenzo Pieralisi
2018-09-13 10:49 ` Lorenzo Pieralisi
2018-09-13 10:49 ` Lorenzo Pieralisi
2018-09-13 15:05 ` Lorenzo Pieralisi
2018-09-13 15:05 ` Lorenzo Pieralisi
2018-09-13 15:05 ` Lorenzo Pieralisi
2018-09-20 21:37 ` Bjorn Helgaas
2018-09-20 21:37 ` Bjorn Helgaas
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.