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Message-ID: <667dde5d-70b9-0001-59f9-f2b7cb8d06b8@synopsys.com>
Date: Tue, 10 Apr 2018 11:36:53 +0100
From: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
To: Kishon Vijay Abraham I <kishon@...com>,
"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
"lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
"Joao.Pinto@...opsys.com" <Joao.Pinto@...opsys.com>,
"jingoohan1@...il.com" <jingoohan1@...il.com>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"mark.rutland@....com" <mark.rutland@....com>
Cc: "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 2/9] PCI: dwc: Add support for endpoint mode
Hi Kishon,
On 10/04/2018 06:12, Kishon Vijay Abraham I wrote:
> Hi,
>
> On Monday 09 April 2018 03:11 PM, Gustavo Pimentel wrote:
>> The PCIe controller dual mode is capable of operating in host mode as well
>> as endpoint mode by configuration, therefore this patch aims to add
>> endpoint mode support to the designware driver.
>>
>> Signed-off-by: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
>> ---
>> Change v1->v2:
>> - Removed dw_plat_pcie_stop_link empty function.
>> - Implemented Kishon's suggestions about dw-pcie-rc and dw-pcie strings.
>> compatibility.
>> - Added second entry on pci_epf_test_ids structure.
>>
>> drivers/pci/dwc/Kconfig | 45 ++++++--
>> drivers/pci/dwc/pcie-designware-ep.c | 4 +-
>> drivers/pci/dwc/pcie-designware-plat.c | 153 ++++++++++++++++++++++++--
>> drivers/pci/endpoint/functions/pci-epf-test.c | 9 ++
>> 4 files changed, 190 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/pci/dwc/Kconfig b/drivers/pci/dwc/Kconfig
>> index 2f3f5c5..3fd7daf 100644
>> --- a/drivers/pci/dwc/Kconfig
>> +++ b/drivers/pci/dwc/Kconfig
>> @@ -7,8 +7,7 @@ config PCIE_DW
>>
>> config PCIE_DW_HOST
>> bool
>> - depends on PCI
>> - depends on PCI_MSI_IRQ_DOMAIN
>> + depends on PCI && PCI_MSI_IRQ_DOMAIN
>> select PCIE_DW
>>
>> config PCIE_DW_EP
>> @@ -52,16 +51,42 @@ config PCI_DRA7XX_EP
>>
>> config PCIE_DW_PLAT
>> bool "Platform bus based DesignWare PCIe Controller"
>> - depends on PCI
>> - depends on PCI_MSI_IRQ_DOMAIN
>> - select PCIE_DW_HOST
>> - ---help---
>> - This selects the DesignWare PCIe controller support. Select this if
>> - you have a PCIe controller on Platform bus.
>> + help
>> + There are two instances of PCIe controller in Designware IP.
>> + This controller can work either as EP or RC. In order to enable
>> + host-specific features PCIE_DW_PLAT_HOST must be selected and in
>> + order to enable device-specific features PCIE_DW_PLAT_EP must be
>> + selected.
>>
>> - If you have a controller with this interface, say Y or M here.
>> +config PCIE_DW_PLAT_HOST
>> + bool "Platform bus based DesignWare PCIe Controller - Host mode"
>> + depends on PCI && PCI_MSI_IRQ_DOMAIN
>> + select PCIE_DW_HOST
>> + select PCIE_DW_PLAT
>> + default y
>> + help
>> + Enables support for the PCIe controller in the Designware IP to
>> + work in host mode. There are two instances of PCIe controller in
>> + Designware IP.
>> + This controller can work either as EP or RC. In order to enable
>> + host-specific features PCIE_DW_PLAT_HOST must be selected and in
>> + order to enable device-specific features PCI_DW_PLAT_EP must be
>> + selected.
>>
>> - If unsure, say N.
>> +config PCIE_DW_PLAT_EP
>> + bool "Platform bus based DesignWare PCIe Controller - Endpoint mode"
>> + depends on PCI && PCI_MSI_IRQ_DOMAIN
>> + depends on PCI_ENDPOINT
>> + select PCIE_DW_EP
>> + select PCIE_DW_PLAT
>> + help
>> + Enables support for the PCIe controller in the Designware IP to
>> + work in endpoint mode. There are two instances of PCIe controller
>> + in Designware IP.
>> + This controller can work either as EP or RC. In order to enable
>> + host-specific features PCIE_DW_PLAT_HOST must be selected and in
>> + order to enable device-specific features PCI_DW_PLAT_EP must be
>> + selected.
>>
>> config PCI_EXYNOS
>> bool "Samsung Exynos PCIe controller"
>> diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c
>> index f07678b..4ac135a 100644
>> --- a/drivers/pci/dwc/pcie-designware-ep.c
>> +++ b/drivers/pci/dwc/pcie-designware-ep.c
>> @@ -15,8 +15,10 @@
>> void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
>> {
>> struct pci_epc *epc = ep->epc;
>> + struct pci_epf *epf;
>>
>> - pci_epc_linkup(epc);
>> + list_for_each_entry(epf, &epc->pci_epf, list)
>> + pci_epf_linkup(epf);
>> }
>
> This shouldn't be required anymore.
Ok. I'll revert it.
>>
>> static void __dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar,
>> diff --git a/drivers/pci/dwc/pcie-designware-plat.c b/drivers/pci/dwc/pcie-designware-plat.c
>> index 5416aa8..5382a7a 100644
>> --- a/drivers/pci/dwc/pcie-designware-plat.c
>> +++ b/drivers/pci/dwc/pcie-designware-plat.c
>> @@ -12,19 +12,29 @@
>> #include <linux/interrupt.h>
>> #include <linux/kernel.h>
>> #include <linux/init.h>
>> +#include <linux/of_device.h>
>> #include <linux/of_gpio.h>
>> #include <linux/pci.h>
>> #include <linux/platform_device.h>
>> #include <linux/resource.h>
>> #include <linux/signal.h>
>> #include <linux/types.h>
>> +#include <linux/regmap.h>
>>
>> #include "pcie-designware.h"
>>
>> struct dw_plat_pcie {
>> - struct dw_pcie *pci;
>> + struct dw_pcie *pci;
>> + struct regmap *regmap;
>> + enum dw_pcie_device_mode mode;
>> };
>>
>> +struct dw_plat_pcie_of_data {
>> + enum dw_pcie_device_mode mode;
>> +};
>> +
>> +static const struct of_device_id dw_plat_pcie_of_match[];
>> +
>> static int dw_plat_pcie_host_init(struct pcie_port *pp)
>> {
>> struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>> @@ -42,9 +52,53 @@ static const struct dw_pcie_host_ops dw_plat_pcie_host_ops = {
>> .host_init = dw_plat_pcie_host_init,
>> };
>>
>> -static int dw_plat_add_pcie_port(struct pcie_port *pp,
>> +static int dw_plat_pcie_establish_link(struct dw_pcie *pci)
>> +{
>> + return 0;
>> +}
>> +
>> +static const struct dw_pcie_ops dw_pcie_ops = {
>> + .start_link = dw_plat_pcie_establish_link,
>> +};
>> +
>> +static void dw_plat_pcie_ep_init(struct dw_pcie_ep *ep)
>> +{
>> + struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
>> + enum pci_barno bar;
>> +
>> + for (bar = BAR_0; bar <= BAR_5; bar++)
>> + dw_pcie_ep_reset_bar(pci, bar);
>> +}
>> +
>> +static int dw_plat_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
>> + enum pci_epc_irq_type type,
>> + u8 interrupt_num)
>> +{
>> + struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
>> +
>> + switch (type) {
>> + case PCI_EPC_IRQ_LEGACY:
>> + dev_err(pci->dev, "EP cannot trigger legacy IRQs\n");
>> + return -EINVAL;
>> + case PCI_EPC_IRQ_MSI:
>> + return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
>> + default:
>> + dev_err(pci->dev, "UNKNOWN IRQ type\n");
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static struct dw_pcie_ep_ops pcie_ep_ops = {
>> + .ep_init = dw_plat_pcie_ep_init,
>> + .raise_irq = dw_plat_pcie_ep_raise_irq,
>> +};
>> +
>> +static int dw_plat_add_pcie_port(struct dw_plat_pcie *dw_plat_pcie,
>> struct platform_device *pdev)
>> {
>> + struct dw_pcie *pci = dw_plat_pcie->pci;
>> + struct pcie_port *pp = &pci->pp;
>> struct device *dev = &pdev->dev;
>> int ret;
>>
>> @@ -63,15 +117,44 @@ static int dw_plat_add_pcie_port(struct pcie_port *pp,
>>
>> ret = dw_pcie_host_init(pp);
>> if (ret) {
>> - dev_err(dev, "failed to initialize host\n");
>> + dev_err(dev, "Failed to initialize host\n");
>> return ret;
>> }
>>
>> return 0;
>> }
>>
>> -static const struct dw_pcie_ops dw_pcie_ops = {
>> -};
>> +static int dw_plat_add_pcie_ep(struct dw_plat_pcie *dw_plat_pcie,
>> + struct platform_device *pdev)
>> +{
>> + int ret;
>> + struct dw_pcie_ep *ep;
>> + struct resource *res;
>> + struct device *dev = &pdev->dev;
>> + struct dw_pcie *pci = dw_plat_pcie->pci;
>> +
>> + ep = &pci->ep;
>> + ep->ops = &pcie_ep_ops;
>> +
>> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi2");
>> + pci->dbi_base2 = devm_ioremap(dev, res->start, resource_size(res));
>
> This can throw up a NULL pointer dereferencing error. Use devm_ioremap_resource
> instead.
I have looked on [1] and [2] and both implementations uses devm_ioremap
function, they are also wrong?
[1] -> https://elixir.bootlin.com/linux/latest/source/drivers/pci/dwc/pcie-artpec6.c
[2] -> https://elixir.bootlin.com/linux/latest/source/drivers/pci/dwc/pci-dra7xx.c
>
>> + if (IS_ERR(pci->dbi_base2))
>> + return PTR_ERR(pci->dbi_base2);
However this validation is wrong. By using the devm_ioremap function the correct
validation should be like this:
if (!pci->dbi_base2)
return -ENOMEM;
like exists on [1] and [2]. Can I maintain the coherency with [1] and [2]?
>> +
>> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
>> + if (!res)
>> + return -EINVAL;
>> +
>> + ep->phys_base = res->start;
>> + ep->addr_size = resource_size(res);
>> +
>> + ret = dw_pcie_ep_init(ep);
>> + if (ret) {
>> + dev_err(dev, "Failed to initialize endpoint\n");
>> + return ret;
>> + }
>> + return 0;
>> +}
>>
>> static int dw_plat_pcie_probe(struct platform_device *pdev)
>> {
>> @@ -80,6 +163,16 @@ static int dw_plat_pcie_probe(struct platform_device *pdev)
>> struct dw_pcie *pci;
>> struct resource *res; /* Resource from DT */
>> int ret;
>> + const struct of_device_id *match;
>> + const struct dw_plat_pcie_of_data *data;
>> + enum dw_pcie_device_mode mode;
>> +
>> + match = of_match_device(dw_plat_pcie_of_match, dev);
>> + if (!match)
>> + return -EINVAL;
>> +
>> + data = (struct dw_plat_pcie_of_data *)match->data;
>> + mode = (enum dw_pcie_device_mode)data->mode;
>>
>> dw_plat_pcie = devm_kzalloc(dev, sizeof(*dw_plat_pcie), GFP_KERNEL);
>> if (!dw_plat_pcie)
>> @@ -93,23 +186,63 @@ static int dw_plat_pcie_probe(struct platform_device *pdev)
>> pci->ops = &dw_pcie_ops;
>>
>> dw_plat_pcie->pci = pci;
>> + dw_plat_pcie->mode = mode;
>> +
>> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
>> + if (!res)
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>
>> - res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> pci->dbi_base = devm_ioremap_resource(dev, res);
>> if (IS_ERR(pci->dbi_base))
>> return PTR_ERR(pci->dbi_base);
>>
>> platform_set_drvdata(pdev, dw_plat_pcie);
>>
>> - ret = dw_plat_add_pcie_port(&pci->pp, pdev);
>> - if (ret < 0)
>> - return ret;
>> + switch (dw_plat_pcie->mode) {
>> + case DW_PCIE_RC_TYPE:
>> + if (!IS_ENABLED(CONFIG_PCIE_DW_PLAT_HOST))
>> + return -ENODEV;
>> +
>> + ret = dw_plat_add_pcie_port(dw_plat_pcie, pdev);
>> + if (ret < 0)
>> + return ret;
>> + break;
>> + case DW_PCIE_EP_TYPE:
>> + if (!IS_ENABLED(CONFIG_PCIE_DW_PLAT_EP))
>> + return -ENODEV;
>> +
>> + ret = dw_plat_add_pcie_ep(dw_plat_pcie, pdev);
>> + if (ret < 0)
>> + return ret;
>> + break;
>> + default:
>> + dev_err(dev, "INVALID device type %d\n", dw_plat_pcie->mode);
>> + }
>>
>> return 0;
>> }
>>
>> +static const struct dw_plat_pcie_of_data dw_plat_pcie_rc_of_data = {
>> + .mode = DW_PCIE_RC_TYPE,
>> +};
>> +
>> +static const struct dw_plat_pcie_of_data dw_plat_pcie_ep_of_data = {
>> + .mode = DW_PCIE_EP_TYPE,
>> +};
>> +
>> static const struct of_device_id dw_plat_pcie_of_match[] = {
>> - { .compatible = "snps,dw-pcie", },
>> + {
>> + .compatible = "snps,dw-pcie",
>> + .data = &dw_plat_pcie_rc_of_data,
>> + },
>> + {
>> + .compatible = "snps,dw-pcie-rc",
>> + .data = &dw_plat_pcie_rc_of_data,
>> + },
>> + {
>> + .compatible = "snps,dw-pcie-ep",
>> + .data = &dw_plat_pcie_ep_of_data,
>> + },
>> {},
>> };
>>
>> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
>> index 7cef851..45d1c63 100644
>> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
>> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
>
> have a separate patch for this.
Ok.
>> @@ -459,10 +459,19 @@ static int pci_epf_test_bind(struct pci_epf *epf)
>> return 0;
>> }
>>
>> +static const struct pci_epf_test_data data_cfg2 = {
>> + .test_reg_bar = BAR_0,
>
> default test_reg_bar is BAR_0. So you can skip this.
Ok, I'll remove it.
>> + .linkup_notifier = false
>> +};
>> +
>
> Thanks
> Kishon
>
Regards,
Gustavo
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