diff mbox series

[v2,08/11] PCI: mvebu: Use child_ops API

Message ID 20220112151814.24361-9-pali@kernel.org
State New
Headers show
Series PCI: mvebu: subsystem ids, AER and INTx | expand

Commit Message

Pali Rohár Jan. 12, 2022, 3:18 p.m. UTC
Split struct pci_ops between ops and child_ops. Member ops is used for
accessing PCIe Root Ports via pci-bridge-emul.c driver and child_ops for
accessing real PCIe cards.

There is no need to mix these two struct pci_ops into one as PCI core code
already provides separate callbacks via bridge->ops and bridge->child_ops.

Signed-off-by: Pali Rohár <pali@kernel.org>
---
 drivers/pci/controller/pci-mvebu.c | 82 ++++++++++++++++--------------
 1 file changed, 44 insertions(+), 38 deletions(-)

Comments

Rob Herring Jan. 20, 2022, 4:49 p.m. UTC | #1
On Wed, Jan 12, 2022 at 04:18:11PM +0100, Pali Rohár wrote:
> Split struct pci_ops between ops and child_ops. Member ops is used for
> accessing PCIe Root Ports via pci-bridge-emul.c driver and child_ops for
> accessing real PCIe cards.
> 
> There is no need to mix these two struct pci_ops into one as PCI core code
> already provides separate callbacks via bridge->ops and bridge->child_ops.
> 
> Signed-off-by: Pali Rohár <pali@kernel.org>
> ---
>  drivers/pci/controller/pci-mvebu.c | 82 ++++++++++++++++--------------
>  1 file changed, 44 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
> index 9ea2f6a7c2b0..1e90ab888075 100644
> --- a/drivers/pci/controller/pci-mvebu.c
> +++ b/drivers/pci/controller/pci-mvebu.c
> @@ -294,11 +294,29 @@ static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
>  	mvebu_writel(port, mask, PCIE_MASK_OFF);
>  }
>  
> -static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
> -				 struct pci_bus *bus,
> -				 u32 devfn, int where, int size, u32 *val)
> +static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie,
> +						    struct pci_bus *bus,
> +						    int devfn);
> +
> +static int mvebu_pcie_child_rd_conf(struct pci_bus *bus, u32 devfn, int where,
> +				    int size, u32 *val)
>  {
> -	void __iomem *conf_data = port->base + PCIE_CONF_DATA_OFF;
> +	struct mvebu_pcie *pcie = bus->sysdata;
> +	struct mvebu_pcie_port *port;
> +	void __iomem *conf_data;
> +
> +	port = mvebu_pcie_find_port(pcie, bus, devfn);
> +	if (!port) {
> +		*val = 0xffffffff;
> +		return PCIBIOS_DEVICE_NOT_FOUND;
> +	}
> +
> +	if (!mvebu_pcie_link_up(port)) {
> +		*val = 0xffffffff;
> +		return PCIBIOS_DEVICE_NOT_FOUND;
> +	}
> +
> +	conf_data = port->base + PCIE_CONF_DATA_OFF;
>  
>  	mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
>  		     PCIE_CONF_ADDR_OFF);
> @@ -321,11 +339,21 @@ static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
>  	return PCIBIOS_SUCCESSFUL;
>  }
>  
> -static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port,
> -				 struct pci_bus *bus,
> -				 u32 devfn, int where, int size, u32 val)
> +static int mvebu_pcie_child_wr_conf(struct pci_bus *bus, u32 devfn,
> +				    int where, int size, u32 val)
>  {
> -	void __iomem *conf_data = port->base + PCIE_CONF_DATA_OFF;
> +	struct mvebu_pcie *pcie = bus->sysdata;
> +	struct mvebu_pcie_port *port;
> +	void __iomem *conf_data;
> +

> +	port = mvebu_pcie_find_port(pcie, bus, devfn);
> +	if (!port)
> +		return PCIBIOS_DEVICE_NOT_FOUND;
> +
> +	if (!mvebu_pcie_link_up(port))
> +		return PCIBIOS_DEVICE_NOT_FOUND;
> +
> +	conf_data = port->base + PCIE_CONF_DATA_OFF;

Again, the same setup code in read and write is a sign to use 
.map_bus(). You can copy it from my version I pointed you to.

Rob
Pali Rohár Jan. 20, 2022, 4:55 p.m. UTC | #2
On Thursday 20 January 2022 10:49:05 Rob Herring wrote:
> On Wed, Jan 12, 2022 at 04:18:11PM +0100, Pali Rohár wrote:
> > Split struct pci_ops between ops and child_ops. Member ops is used for
> > accessing PCIe Root Ports via pci-bridge-emul.c driver and child_ops for
> > accessing real PCIe cards.
> > 
> > There is no need to mix these two struct pci_ops into one as PCI core code
> > already provides separate callbacks via bridge->ops and bridge->child_ops.
> > 
> > Signed-off-by: Pali Rohár <pali@kernel.org>
> > ---
> >  drivers/pci/controller/pci-mvebu.c | 82 ++++++++++++++++--------------
> >  1 file changed, 44 insertions(+), 38 deletions(-)
> > 
> > diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
> > index 9ea2f6a7c2b0..1e90ab888075 100644
> > --- a/drivers/pci/controller/pci-mvebu.c
> > +++ b/drivers/pci/controller/pci-mvebu.c
> > @@ -294,11 +294,29 @@ static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
> >  	mvebu_writel(port, mask, PCIE_MASK_OFF);
> >  }
> >  
> > -static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
> > -				 struct pci_bus *bus,
> > -				 u32 devfn, int where, int size, u32 *val)
> > +static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie,
> > +						    struct pci_bus *bus,
> > +						    int devfn);
> > +
> > +static int mvebu_pcie_child_rd_conf(struct pci_bus *bus, u32 devfn, int where,
> > +				    int size, u32 *val)
> >  {
> > -	void __iomem *conf_data = port->base + PCIE_CONF_DATA_OFF;
> > +	struct mvebu_pcie *pcie = bus->sysdata;
> > +	struct mvebu_pcie_port *port;
> > +	void __iomem *conf_data;
> > +
> > +	port = mvebu_pcie_find_port(pcie, bus, devfn);
> > +	if (!port) {
> > +		*val = 0xffffffff;
> > +		return PCIBIOS_DEVICE_NOT_FOUND;
> > +	}
> > +
> > +	if (!mvebu_pcie_link_up(port)) {
> > +		*val = 0xffffffff;
> > +		return PCIBIOS_DEVICE_NOT_FOUND;
> > +	}
> > +
> > +	conf_data = port->base + PCIE_CONF_DATA_OFF;
> >  
> >  	mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
> >  		     PCIE_CONF_ADDR_OFF);
> > @@ -321,11 +339,21 @@ static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
> >  	return PCIBIOS_SUCCESSFUL;
> >  }
> >  
> > -static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port,
> > -				 struct pci_bus *bus,
> > -				 u32 devfn, int where, int size, u32 val)
> > +static int mvebu_pcie_child_wr_conf(struct pci_bus *bus, u32 devfn,
> > +				    int where, int size, u32 val)
> >  {
> > -	void __iomem *conf_data = port->base + PCIE_CONF_DATA_OFF;
> > +	struct mvebu_pcie *pcie = bus->sysdata;
> > +	struct mvebu_pcie_port *port;
> > +	void __iomem *conf_data;
> > +
> 
> > +	port = mvebu_pcie_find_port(pcie, bus, devfn);
> > +	if (!port)
> > +		return PCIBIOS_DEVICE_NOT_FOUND;
> > +
> > +	if (!mvebu_pcie_link_up(port))
> > +		return PCIBIOS_DEVICE_NOT_FOUND;
> > +
> > +	conf_data = port->base + PCIE_CONF_DATA_OFF;
> 
> Again, the same setup code in read and write is a sign to use 
> .map_bus(). You can copy it from my version I pointed you to.
> 
> Rob

I'm planning to do other cleanup in followup patches. But there are too
many mvebu and aardvark patches on the list waiting, and I do not want
to send another batch.
Rob Herring Jan. 20, 2022, 6:40 p.m. UTC | #3
On Thu, Jan 20, 2022 at 10:55 AM Pali Rohár <pali@kernel.org> wrote:
>
> On Thursday 20 January 2022 10:49:05 Rob Herring wrote:
> > On Wed, Jan 12, 2022 at 04:18:11PM +0100, Pali Rohár wrote:
> > > Split struct pci_ops between ops and child_ops. Member ops is used for
> > > accessing PCIe Root Ports via pci-bridge-emul.c driver and child_ops for
> > > accessing real PCIe cards.
> > >
> > > There is no need to mix these two struct pci_ops into one as PCI core code
> > > already provides separate callbacks via bridge->ops and bridge->child_ops.
> > >
> > > Signed-off-by: Pali Rohár <pali@kernel.org>
> > > ---
> > >  drivers/pci/controller/pci-mvebu.c | 82 ++++++++++++++++--------------
> > >  1 file changed, 44 insertions(+), 38 deletions(-)
> > >
> > > diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
> > > index 9ea2f6a7c2b0..1e90ab888075 100644
> > > --- a/drivers/pci/controller/pci-mvebu.c
> > > +++ b/drivers/pci/controller/pci-mvebu.c
> > > @@ -294,11 +294,29 @@ static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
> > >     mvebu_writel(port, mask, PCIE_MASK_OFF);
> > >  }
> > >
> > > -static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
> > > -                            struct pci_bus *bus,
> > > -                            u32 devfn, int where, int size, u32 *val)
> > > +static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie,
> > > +                                               struct pci_bus *bus,
> > > +                                               int devfn);
> > > +
> > > +static int mvebu_pcie_child_rd_conf(struct pci_bus *bus, u32 devfn, int where,
> > > +                               int size, u32 *val)
> > >  {
> > > -   void __iomem *conf_data = port->base + PCIE_CONF_DATA_OFF;
> > > +   struct mvebu_pcie *pcie = bus->sysdata;
> > > +   struct mvebu_pcie_port *port;
> > > +   void __iomem *conf_data;
> > > +
> > > +   port = mvebu_pcie_find_port(pcie, bus, devfn);
> > > +   if (!port) {
> > > +           *val = 0xffffffff;
> > > +           return PCIBIOS_DEVICE_NOT_FOUND;
> > > +   }
> > > +
> > > +   if (!mvebu_pcie_link_up(port)) {
> > > +           *val = 0xffffffff;
> > > +           return PCIBIOS_DEVICE_NOT_FOUND;
> > > +   }
> > > +
> > > +   conf_data = port->base + PCIE_CONF_DATA_OFF;
> > >
> > >     mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
> > >                  PCIE_CONF_ADDR_OFF);
> > > @@ -321,11 +339,21 @@ static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
> > >     return PCIBIOS_SUCCESSFUL;
> > >  }
> > >
> > > -static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port,
> > > -                            struct pci_bus *bus,
> > > -                            u32 devfn, int where, int size, u32 val)
> > > +static int mvebu_pcie_child_wr_conf(struct pci_bus *bus, u32 devfn,
> > > +                               int where, int size, u32 val)
> > >  {
> > > -   void __iomem *conf_data = port->base + PCIE_CONF_DATA_OFF;
> > > +   struct mvebu_pcie *pcie = bus->sysdata;
> > > +   struct mvebu_pcie_port *port;
> > > +   void __iomem *conf_data;
> > > +
> >
> > > +   port = mvebu_pcie_find_port(pcie, bus, devfn);
> > > +   if (!port)
> > > +           return PCIBIOS_DEVICE_NOT_FOUND;
> > > +
> > > +   if (!mvebu_pcie_link_up(port))
> > > +           return PCIBIOS_DEVICE_NOT_FOUND;
> > > +
> > > +   conf_data = port->base + PCIE_CONF_DATA_OFF;
> >
> > Again, the same setup code in read and write is a sign to use
> > .map_bus(). You can copy it from my version I pointed you to.
> >
> > Rob
>
> I'm planning to do other cleanup in followup patches. But there are too
> many mvebu and aardvark patches on the list waiting, and I do not want
> to send another batch.

It can all be part of this patch.

Rob
diff mbox series

Patch

diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index 9ea2f6a7c2b0..1e90ab888075 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -294,11 +294,29 @@  static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
 	mvebu_writel(port, mask, PCIE_MASK_OFF);
 }
 
-static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
-				 struct pci_bus *bus,
-				 u32 devfn, int where, int size, u32 *val)
+static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie,
+						    struct pci_bus *bus,
+						    int devfn);
+
+static int mvebu_pcie_child_rd_conf(struct pci_bus *bus, u32 devfn, int where,
+				    int size, u32 *val)
 {
-	void __iomem *conf_data = port->base + PCIE_CONF_DATA_OFF;
+	struct mvebu_pcie *pcie = bus->sysdata;
+	struct mvebu_pcie_port *port;
+	void __iomem *conf_data;
+
+	port = mvebu_pcie_find_port(pcie, bus, devfn);
+	if (!port) {
+		*val = 0xffffffff;
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	}
+
+	if (!mvebu_pcie_link_up(port)) {
+		*val = 0xffffffff;
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	}
+
+	conf_data = port->base + PCIE_CONF_DATA_OFF;
 
 	mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
 		     PCIE_CONF_ADDR_OFF);
@@ -321,11 +339,21 @@  static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
 	return PCIBIOS_SUCCESSFUL;
 }
 
-static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port,
-				 struct pci_bus *bus,
-				 u32 devfn, int where, int size, u32 val)
+static int mvebu_pcie_child_wr_conf(struct pci_bus *bus, u32 devfn,
+				    int where, int size, u32 val)
 {
-	void __iomem *conf_data = port->base + PCIE_CONF_DATA_OFF;
+	struct mvebu_pcie *pcie = bus->sysdata;
+	struct mvebu_pcie_port *port;
+	void __iomem *conf_data;
+
+	port = mvebu_pcie_find_port(pcie, bus, devfn);
+	if (!port)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	if (!mvebu_pcie_link_up(port))
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	conf_data = port->base + PCIE_CONF_DATA_OFF;
 
 	mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
 		     PCIE_CONF_ADDR_OFF);
@@ -347,6 +375,11 @@  static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port,
 	return PCIBIOS_SUCCESSFUL;
 }
 
+static struct pci_ops mvebu_pcie_child_ops = {
+	.read = mvebu_pcie_child_rd_conf,
+	.write = mvebu_pcie_child_wr_conf,
+};
+
 /*
  * Remove windows, starting from the largest ones to the smallest
  * ones.
@@ -862,25 +895,12 @@  static int mvebu_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
 {
 	struct mvebu_pcie *pcie = bus->sysdata;
 	struct mvebu_pcie_port *port;
-	int ret;
 
 	port = mvebu_pcie_find_port(pcie, bus, devfn);
 	if (!port)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
-	/* Access the emulated PCI-to-PCI bridge */
-	if (bus->number == 0)
-		return pci_bridge_emul_conf_write(&port->bridge, where,
-						  size, val);
-
-	if (!mvebu_pcie_link_up(port))
-		return PCIBIOS_DEVICE_NOT_FOUND;
-
-	/* Access the real PCIe interface */
-	ret = mvebu_pcie_hw_wr_conf(port, bus, devfn,
-				    where, size, val);
-
-	return ret;
+	return pci_bridge_emul_conf_write(&port->bridge, where, size, val);
 }
 
 /* PCI configuration space read function */
@@ -889,7 +909,6 @@  static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
 {
 	struct mvebu_pcie *pcie = bus->sysdata;
 	struct mvebu_pcie_port *port;
-	int ret;
 
 	port = mvebu_pcie_find_port(pcie, bus, devfn);
 	if (!port) {
@@ -897,21 +916,7 @@  static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	}
 
-	/* Access the emulated PCI-to-PCI bridge */
-	if (bus->number == 0)
-		return pci_bridge_emul_conf_read(&port->bridge, where,
-						 size, val);
-
-	if (!mvebu_pcie_link_up(port)) {
-		*val = 0xffffffff;
-		return PCIBIOS_DEVICE_NOT_FOUND;
-	}
-
-	/* Access the real PCIe interface */
-	ret = mvebu_pcie_hw_rd_conf(port, bus, devfn,
-				    where, size, val);
-
-	return ret;
+	return pci_bridge_emul_conf_read(&port->bridge, where, size, val);
 }
 
 static struct pci_ops mvebu_pcie_ops = {
@@ -1421,6 +1426,7 @@  static int mvebu_pcie_probe(struct platform_device *pdev)
 
 	bridge->sysdata = pcie;
 	bridge->ops = &mvebu_pcie_ops;
+	bridge->child_ops = &mvebu_pcie_child_ops;
 	bridge->align_resource = mvebu_pcie_align_resource;
 	bridge->map_irq = mvebu_pcie_map_irq;