| Message ID | 20240314-pci-dbi-rework-v10-8-14a45c5a938e@linaro.org |
|---|---|
| State | Handled Elsewhere |
| Headers | show |
| Series | PCI: dwc: ep: Fix DBI access failure for drivers requiring refclk from host | expand |
On Thu, Mar 14, 2024 at 01:18:06PM +0530, Manivannan Sadhasivam wrote: > "core_init_notifier" flag is set by the glue drivers requiring refclk from > the host to complete the DWC core initialization. Also, those drivers will > send a notification to the EPF drivers once the initialization is fully > completed using the pci_epc_init_notify() API. Only then, the EPF drivers > will start functioning. > > For the rest of the drivers generating refclk locally, EPF drivers will > start functioning post binding with them. EPF drivers rely on the > 'core_init_notifier' flag to differentiate between the drivers. > Unfortunately, this creates two different flows for the EPF drivers. > > So to avoid that, let's get rid of the "core_init_notifier" flag and follow > a single initialization flow for the EPF drivers. This is done by calling > the dw_pcie_ep_init_notify() from all glue drivers after the completion of > dw_pcie_ep_init_registers() API. This will allow all the glue drivers to > send the notification to the EPF drivers once the initialization is fully > completed. > > Only difference here is that, the drivers requiring refclk from host will > send the notification once refclk is received, while others will send it > during probe time itself. > > But this also requires the EPC core driver to deliver the notification > after EPF driver bind. Because, the glue driver can send the notification > before the EPF drivers bind() and in those cases the EPF drivers will miss > the event. To accommodate this, EPC core is now caching the state of the > EPC initialization in 'init_complete' flag and pci-ep-cfs driver sends the > notification to EPF drivers based on that after each EPF driver bind. > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> > --- > drivers/pci/controller/dwc/pci-dra7xx.c | 2 ++ > drivers/pci/controller/dwc/pci-imx6.c | 2 ++ > drivers/pci/controller/dwc/pci-keystone.c | 2 ++ > drivers/pci/controller/dwc/pci-layerscape-ep.c | 2 ++ > drivers/pci/controller/dwc/pcie-artpec6.c | 2 ++ > drivers/pci/controller/dwc/pcie-designware-plat.c | 2 ++ > drivers/pci/controller/dwc/pcie-keembay.c | 2 ++ > drivers/pci/controller/dwc/pcie-qcom-ep.c | 1 - > drivers/pci/controller/dwc/pcie-rcar-gen4.c | 2 ++ > drivers/pci/controller/dwc/pcie-tegra194.c | 1 - > drivers/pci/controller/dwc/pcie-uniphier-ep.c | 2 ++ > drivers/pci/endpoint/functions/pci-epf-test.c | 18 +++++------------- > drivers/pci/endpoint/pci-ep-cfs.c | 9 +++++++++ > drivers/pci/endpoint/pci-epc-core.c | 22 ++++++++++++++++++++++ > include/linux/pci-epc.h | 7 ++++--- > 15 files changed, 58 insertions(+), 18 deletions(-) FWIW: Tested-by: Niklas Cassel <cassel@kernel.org> However, when looking at this, I was surprised that you never call something that will set: init_complete = false; from e.g. dw_pcie_ep_deinit() or dw_pcie_ep_cleanup(). I saw that you do seem to set init_complete = false; in your other follow up series that is based on this one. What will happen if you run with only this series merged (without your follow up series), on a platform that used to have .core_init_notifier? If you do remove and recreate the symlink on a platform with external refclk, since you never set init_complete to false, you could trigger EPF core_init callback, e.g. pci_epf_test_core_init() to be called, which will do DBI writes even when there is no refclk. E.g. (on a platform with external refclk): 1) Create symlink to pci-epf-test in configfs. 2) Start RC, your EPC driver will call ep_init_notifiy() when perst deasserts. 3) Run pci-epf-test. 4) Remove the pci-epf-test symlink 5) Shutdown RC 6) Create symlink to pci-epf-test in configfs. This will see that init_complete is true, and will do DBI writes which will crash your system, since you don't have a refclk. Perhaps you should move the patch that calls a function that sets init_complete = false; to this series, so that this crash is not possible? > > diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c > index 395042b29ffc..d2d17d37d3e0 100644 > --- a/drivers/pci/controller/dwc/pci-dra7xx.c > +++ b/drivers/pci/controller/dwc/pci-dra7xx.c > @@ -474,6 +474,8 @@ static int dra7xx_add_pcie_ep(struct dra7xx_pcie *dra7xx, > return ret; > } > > + dw_pcie_ep_init_notify(ep); > + > return 0; > } > > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c > index bfcafa440ddb..894b5de76e3a 100644 > --- a/drivers/pci/controller/dwc/pci-imx6.c > +++ b/drivers/pci/controller/dwc/pci-imx6.c > @@ -1144,6 +1144,8 @@ static int imx6_add_pcie_ep(struct imx6_pcie *imx6_pcie, > return ret; > } > > + dw_pcie_ep_init_notify(ep); > + > /* Start LTSSM. */ > imx6_pcie_ltssm_enable(dev); > > diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c > index 093dbb725e41..b7b30470b394 100644 > --- a/drivers/pci/controller/dwc/pci-keystone.c > +++ b/drivers/pci/controller/dwc/pci-keystone.c > @@ -1293,6 +1293,8 @@ static int ks_pcie_probe(struct platform_device *pdev) > goto err_ep_init; > } > > + dw_pcie_ep_init_notify(&pci->ep); > + > break; > default: > dev_err(dev, "INVALID device type %d\n", mode); > diff --git a/drivers/pci/controller/dwc/pci-layerscape-ep.c b/drivers/pci/controller/dwc/pci-layerscape-ep.c > index b712fdd06549..c513598a46d7 100644 > --- a/drivers/pci/controller/dwc/pci-layerscape-ep.c > +++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c > @@ -283,6 +283,8 @@ static int __init ls_pcie_ep_probe(struct platform_device *pdev) > return ret; > } > > + dw_pcie_ep_init_notify(&pci->ep); > + > return ls_pcie_ep_interrupt_init(pcie, pdev); > } > > diff --git a/drivers/pci/controller/dwc/pcie-artpec6.c b/drivers/pci/controller/dwc/pcie-artpec6.c > index a6095561db4a..a4630b92489b 100644 > --- a/drivers/pci/controller/dwc/pcie-artpec6.c > +++ b/drivers/pci/controller/dwc/pcie-artpec6.c > @@ -452,6 +452,8 @@ static int artpec6_pcie_probe(struct platform_device *pdev) > return ret; > } > > + dw_pcie_ep_init_notify(&pci->ep); > + > break; > default: > dev_err(dev, "INVALID device type %d\n", artpec6_pcie->mode); > diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c > index ca9b22e654cd..8490c5d6ff9f 100644 > --- a/drivers/pci/controller/dwc/pcie-designware-plat.c > +++ b/drivers/pci/controller/dwc/pcie-designware-plat.c > @@ -154,6 +154,8 @@ static int dw_plat_pcie_probe(struct platform_device *pdev) > dw_pcie_ep_deinit(&pci->ep); > } > > + dw_pcie_ep_init_notify(&pci->ep); > + > break; > default: > dev_err(dev, "INVALID device type %d\n", dw_plat_pcie->mode); > diff --git a/drivers/pci/controller/dwc/pcie-keembay.c b/drivers/pci/controller/dwc/pcie-keembay.c > index 250d6acf16dc..9fa9354a5f48 100644 > --- a/drivers/pci/controller/dwc/pcie-keembay.c > +++ b/drivers/pci/controller/dwc/pcie-keembay.c > @@ -438,6 +438,8 @@ static int keembay_pcie_probe(struct platform_device *pdev) > return ret; > } > > + dw_pcie_ep_init_notify(&pci->ep); > + > break; > default: > dev_err(dev, "Invalid device type %d\n", pcie->mode); > diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c > index 3697b4a944cc..2fb8c15e7a91 100644 > --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c > +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c > @@ -775,7 +775,6 @@ static void qcom_pcie_ep_init_debugfs(struct qcom_pcie_ep *pcie_ep) > > static const struct pci_epc_features qcom_pcie_epc_features = { > .linkup_notifier = true, > - .core_init_notifier = true, > .msi_capable = true, > .msix_capable = false, > .align = SZ_4K, > diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c > index fb7c03639a53..0448928017f3 100644 > --- a/drivers/pci/controller/dwc/pcie-rcar-gen4.c > +++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c > @@ -435,6 +435,8 @@ static int rcar_gen4_add_dw_pcie_ep(struct rcar_gen4_pcie *rcar) > rcar_gen4_pcie_ep_deinit(rcar); > } > > + dw_pcie_ep_init_notify(ep); > + > return ret; > } > > diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c > index 264ee76bf008..e02deb31a72d 100644 > --- a/drivers/pci/controller/dwc/pcie-tegra194.c > +++ b/drivers/pci/controller/dwc/pcie-tegra194.c > @@ -2006,7 +2006,6 @@ static int tegra_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no, > > static const struct pci_epc_features tegra_pcie_epc_features = { > .linkup_notifier = true, > - .core_init_notifier = true, > .msi_capable = false, > .msix_capable = false, > .reserved_bar = 1 << BAR_2 | 1 << BAR_3 | 1 << BAR_4 | 1 << BAR_5, > diff --git a/drivers/pci/controller/dwc/pcie-uniphier-ep.c b/drivers/pci/controller/dwc/pcie-uniphier-ep.c > index 82ccaea089be..eb1d79fdb1f1 100644 > --- a/drivers/pci/controller/dwc/pcie-uniphier-ep.c > +++ b/drivers/pci/controller/dwc/pcie-uniphier-ep.c > @@ -410,6 +410,8 @@ static int uniphier_pcie_ep_probe(struct platform_device *pdev) > return ret; > } > > + dw_pcie_ep_init_notify(&priv->pci.ep); > + > return 0; > } > > diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c > index 18c80002d3bd..fc0282b0d626 100644 > --- a/drivers/pci/endpoint/functions/pci-epf-test.c > +++ b/drivers/pci/endpoint/functions/pci-epf-test.c > @@ -753,6 +753,7 @@ static int pci_epf_test_core_init(struct pci_epf *epf) > const struct pci_epc_features *epc_features; > struct pci_epc *epc = epf->epc; > struct device *dev = &epf->dev; > + bool linkup_notifier = false; > bool msix_capable = false; > bool msi_capable = true; > int ret; > @@ -795,6 +796,10 @@ static int pci_epf_test_core_init(struct pci_epf *epf) > } > } > > + linkup_notifier = epc_features->linkup_notifier; > + if (!linkup_notifier) > + queue_work(kpcitest_workqueue, &epf_test->cmd_handler.work); > + > return 0; > } > > @@ -901,8 +906,6 @@ static int pci_epf_test_bind(struct pci_epf *epf) > const struct pci_epc_features *epc_features; > enum pci_barno test_reg_bar = BAR_0; > struct pci_epc *epc = epf->epc; > - bool linkup_notifier = false; > - bool core_init_notifier = false; > > if (WARN_ON_ONCE(!epc)) > return -EINVAL; > @@ -913,8 +916,6 @@ static int pci_epf_test_bind(struct pci_epf *epf) > return -EOPNOTSUPP; > } > > - linkup_notifier = epc_features->linkup_notifier; > - core_init_notifier = epc_features->core_init_notifier; > test_reg_bar = pci_epc_get_first_free_bar(epc_features); > if (test_reg_bar < 0) > return -EINVAL; > @@ -927,21 +928,12 @@ static int pci_epf_test_bind(struct pci_epf *epf) > if (ret) > return ret; > > - if (!core_init_notifier) { > - ret = pci_epf_test_core_init(epf); > - if (ret) > - return ret; > - } > - While you did fix up all DWC based drivers, the non-DWC EPC drivers that did not have epc_features->core_init_notifier before this patch: drivers/pci/controller/cadence/pcie-cadence-ep.c:#include <linux/pci-epc.h> drivers/pci/controller/pcie-rcar-ep.c:#include <linux/pci-epc.h> drivers/pci/controller/pcie-rockchip-ep.c:#include <linux/pci-epc.h> I don't think that they will work with pci-epf-test anymore, since AFAICT, you did not add a call to: pci_epc_init_notify() or similar in these EPC drivers. (Like this patch does to all the DWC-based drivers without a core_init_notifier.) Kind regards, Niklas
On Fri, Mar 22, 2024 at 12:53:50PM +0100, Niklas Cassel wrote: > On Thu, Mar 14, 2024 at 01:18:06PM +0530, Manivannan Sadhasivam wrote: > > "core_init_notifier" flag is set by the glue drivers requiring refclk from > > the host to complete the DWC core initialization. Also, those drivers will > > send a notification to the EPF drivers once the initialization is fully > > completed using the pci_epc_init_notify() API. Only then, the EPF drivers > > will start functioning. > > > > For the rest of the drivers generating refclk locally, EPF drivers will > > start functioning post binding with them. EPF drivers rely on the > > 'core_init_notifier' flag to differentiate between the drivers. > > Unfortunately, this creates two different flows for the EPF drivers. > > > > So to avoid that, let's get rid of the "core_init_notifier" flag and follow > > a single initialization flow for the EPF drivers. This is done by calling > > the dw_pcie_ep_init_notify() from all glue drivers after the completion of > > dw_pcie_ep_init_registers() API. This will allow all the glue drivers to > > send the notification to the EPF drivers once the initialization is fully > > completed. > > > > Only difference here is that, the drivers requiring refclk from host will > > send the notification once refclk is received, while others will send it > > during probe time itself. > > > > But this also requires the EPC core driver to deliver the notification > > after EPF driver bind. Because, the glue driver can send the notification > > before the EPF drivers bind() and in those cases the EPF drivers will miss > > the event. To accommodate this, EPC core is now caching the state of the > > EPC initialization in 'init_complete' flag and pci-ep-cfs driver sends the > > notification to EPF drivers based on that after each EPF driver bind. > > > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> > > --- > > drivers/pci/controller/dwc/pci-dra7xx.c | 2 ++ > > drivers/pci/controller/dwc/pci-imx6.c | 2 ++ > > drivers/pci/controller/dwc/pci-keystone.c | 2 ++ > > drivers/pci/controller/dwc/pci-layerscape-ep.c | 2 ++ > > drivers/pci/controller/dwc/pcie-artpec6.c | 2 ++ > > drivers/pci/controller/dwc/pcie-designware-plat.c | 2 ++ > > drivers/pci/controller/dwc/pcie-keembay.c | 2 ++ > > drivers/pci/controller/dwc/pcie-qcom-ep.c | 1 - > > drivers/pci/controller/dwc/pcie-rcar-gen4.c | 2 ++ > > drivers/pci/controller/dwc/pcie-tegra194.c | 1 - > > drivers/pci/controller/dwc/pcie-uniphier-ep.c | 2 ++ > > drivers/pci/endpoint/functions/pci-epf-test.c | 18 +++++------------- > > drivers/pci/endpoint/pci-ep-cfs.c | 9 +++++++++ > > drivers/pci/endpoint/pci-epc-core.c | 22 ++++++++++++++++++++++ > > include/linux/pci-epc.h | 7 ++++--- > > 15 files changed, 58 insertions(+), 18 deletions(-) > > FWIW: > Tested-by: Niklas Cassel <cassel@kernel.org> > > > > However, when looking at this, I was surprised that you never call something > that will set: > init_complete = false; > from e.g. dw_pcie_ep_deinit() or dw_pcie_ep_cleanup(). > > I saw that you do seem to set > init_complete = false; > in your other follow up series that is based on this one. > > What will happen if you run with only this series merged (without your > follow up series), on a platform that used to have .core_init_notifier? > > If you do remove and recreate the symlink on a platform with external > refclk, since you never set init_complete to false, you could trigger > EPF core_init callback, e.g. pci_epf_test_core_init() to be called, > which will do DBI writes even when there is no refclk. > > E.g. (on a platform with external refclk): > 1) Create symlink to pci-epf-test in configfs. > 2) Start RC, your EPC driver will call ep_init_notifiy() when perst > deasserts. > 3) Run pci-epf-test. > 4) Remove the pci-epf-test symlink > 5) Shutdown RC > 6) Create symlink to pci-epf-test in configfs. > This will see that init_complete is true, and will do DBI writes > which will crash your system, since you don't have a refclk. > > Perhaps you should move the patch that calls a function that sets > init_complete = false; > to this series, so that this crash is not possible? > Good catch! But moving that patch to this series requires moving some other patches as well. So in the meantime, I'll set this flag to false in dw_pcie_ep_cleanup(). [...] > > diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c > > index 18c80002d3bd..fc0282b0d626 100644 > > --- a/drivers/pci/endpoint/functions/pci-epf-test.c > > +++ b/drivers/pci/endpoint/functions/pci-epf-test.c [...] > > - if (!core_init_notifier) { > > - ret = pci_epf_test_core_init(epf); > > - if (ret) > > - return ret; > > - } > > - > > While you did fix up all DWC based drivers, the non-DWC EPC drivers that > did not have epc_features->core_init_notifier before this patch: > > drivers/pci/controller/cadence/pcie-cadence-ep.c:#include <linux/pci-epc.h> > drivers/pci/controller/pcie-rcar-ep.c:#include <linux/pci-epc.h> > drivers/pci/controller/pcie-rockchip-ep.c:#include <linux/pci-epc.h> > > I don't think that they will work with pci-epf-test anymore, since AFAICT, > you did not add a call to: pci_epc_init_notify() or similar in these EPC drivers. > (Like this patch does to all the DWC-based drivers without a core_init_notifier.) > Doh, yeah I completely missed these. Thanks for pointing out. Will add the notify_init call in next version. - Mani
diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c index 395042b29ffc..d2d17d37d3e0 100644 --- a/drivers/pci/controller/dwc/pci-dra7xx.c +++ b/drivers/pci/controller/dwc/pci-dra7xx.c @@ -474,6 +474,8 @@ static int dra7xx_add_pcie_ep(struct dra7xx_pcie *dra7xx, return ret; } + dw_pcie_ep_init_notify(ep); + return 0; } diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index bfcafa440ddb..894b5de76e3a 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -1144,6 +1144,8 @@ static int imx6_add_pcie_ep(struct imx6_pcie *imx6_pcie, return ret; } + dw_pcie_ep_init_notify(ep); + /* Start LTSSM. */ imx6_pcie_ltssm_enable(dev); diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c index 093dbb725e41..b7b30470b394 100644 --- a/drivers/pci/controller/dwc/pci-keystone.c +++ b/drivers/pci/controller/dwc/pci-keystone.c @@ -1293,6 +1293,8 @@ static int ks_pcie_probe(struct platform_device *pdev) goto err_ep_init; } + dw_pcie_ep_init_notify(&pci->ep); + break; default: dev_err(dev, "INVALID device type %d\n", mode); diff --git a/drivers/pci/controller/dwc/pci-layerscape-ep.c b/drivers/pci/controller/dwc/pci-layerscape-ep.c index b712fdd06549..c513598a46d7 100644 --- a/drivers/pci/controller/dwc/pci-layerscape-ep.c +++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c @@ -283,6 +283,8 @@ static int __init ls_pcie_ep_probe(struct platform_device *pdev) return ret; } + dw_pcie_ep_init_notify(&pci->ep); + return ls_pcie_ep_interrupt_init(pcie, pdev); } diff --git a/drivers/pci/controller/dwc/pcie-artpec6.c b/drivers/pci/controller/dwc/pcie-artpec6.c index a6095561db4a..a4630b92489b 100644 --- a/drivers/pci/controller/dwc/pcie-artpec6.c +++ b/drivers/pci/controller/dwc/pcie-artpec6.c @@ -452,6 +452,8 @@ static int artpec6_pcie_probe(struct platform_device *pdev) return ret; } + dw_pcie_ep_init_notify(&pci->ep); + break; default: dev_err(dev, "INVALID device type %d\n", artpec6_pcie->mode); diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c index ca9b22e654cd..8490c5d6ff9f 100644 --- a/drivers/pci/controller/dwc/pcie-designware-plat.c +++ b/drivers/pci/controller/dwc/pcie-designware-plat.c @@ -154,6 +154,8 @@ static int dw_plat_pcie_probe(struct platform_device *pdev) dw_pcie_ep_deinit(&pci->ep); } + dw_pcie_ep_init_notify(&pci->ep); + break; default: dev_err(dev, "INVALID device type %d\n", dw_plat_pcie->mode); diff --git a/drivers/pci/controller/dwc/pcie-keembay.c b/drivers/pci/controller/dwc/pcie-keembay.c index 250d6acf16dc..9fa9354a5f48 100644 --- a/drivers/pci/controller/dwc/pcie-keembay.c +++ b/drivers/pci/controller/dwc/pcie-keembay.c @@ -438,6 +438,8 @@ static int keembay_pcie_probe(struct platform_device *pdev) return ret; } + dw_pcie_ep_init_notify(&pci->ep); + break; default: dev_err(dev, "Invalid device type %d\n", pcie->mode); diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c index 3697b4a944cc..2fb8c15e7a91 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c @@ -775,7 +775,6 @@ static void qcom_pcie_ep_init_debugfs(struct qcom_pcie_ep *pcie_ep) static const struct pci_epc_features qcom_pcie_epc_features = { .linkup_notifier = true, - .core_init_notifier = true, .msi_capable = true, .msix_capable = false, .align = SZ_4K, diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c index fb7c03639a53..0448928017f3 100644 --- a/drivers/pci/controller/dwc/pcie-rcar-gen4.c +++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c @@ -435,6 +435,8 @@ static int rcar_gen4_add_dw_pcie_ep(struct rcar_gen4_pcie *rcar) rcar_gen4_pcie_ep_deinit(rcar); } + dw_pcie_ep_init_notify(ep); + return ret; } diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c index 264ee76bf008..e02deb31a72d 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -2006,7 +2006,6 @@ static int tegra_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no, static const struct pci_epc_features tegra_pcie_epc_features = { .linkup_notifier = true, - .core_init_notifier = true, .msi_capable = false, .msix_capable = false, .reserved_bar = 1 << BAR_2 | 1 << BAR_3 | 1 << BAR_4 | 1 << BAR_5, diff --git a/drivers/pci/controller/dwc/pcie-uniphier-ep.c b/drivers/pci/controller/dwc/pcie-uniphier-ep.c index 82ccaea089be..eb1d79fdb1f1 100644 --- a/drivers/pci/controller/dwc/pcie-uniphier-ep.c +++ b/drivers/pci/controller/dwc/pcie-uniphier-ep.c @@ -410,6 +410,8 @@ static int uniphier_pcie_ep_probe(struct platform_device *pdev) return ret; } + dw_pcie_ep_init_notify(&priv->pci.ep); + return 0; } diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c index 18c80002d3bd..fc0282b0d626 100644 --- a/drivers/pci/endpoint/functions/pci-epf-test.c +++ b/drivers/pci/endpoint/functions/pci-epf-test.c @@ -753,6 +753,7 @@ static int pci_epf_test_core_init(struct pci_epf *epf) const struct pci_epc_features *epc_features; struct pci_epc *epc = epf->epc; struct device *dev = &epf->dev; + bool linkup_notifier = false; bool msix_capable = false; bool msi_capable = true; int ret; @@ -795,6 +796,10 @@ static int pci_epf_test_core_init(struct pci_epf *epf) } } + linkup_notifier = epc_features->linkup_notifier; + if (!linkup_notifier) + queue_work(kpcitest_workqueue, &epf_test->cmd_handler.work); + return 0; } @@ -901,8 +906,6 @@ static int pci_epf_test_bind(struct pci_epf *epf) const struct pci_epc_features *epc_features; enum pci_barno test_reg_bar = BAR_0; struct pci_epc *epc = epf->epc; - bool linkup_notifier = false; - bool core_init_notifier = false; if (WARN_ON_ONCE(!epc)) return -EINVAL; @@ -913,8 +916,6 @@ static int pci_epf_test_bind(struct pci_epf *epf) return -EOPNOTSUPP; } - linkup_notifier = epc_features->linkup_notifier; - core_init_notifier = epc_features->core_init_notifier; test_reg_bar = pci_epc_get_first_free_bar(epc_features); if (test_reg_bar < 0) return -EINVAL; @@ -927,21 +928,12 @@ static int pci_epf_test_bind(struct pci_epf *epf) if (ret) return ret; - if (!core_init_notifier) { - ret = pci_epf_test_core_init(epf); - if (ret) - return ret; - } - epf_test->dma_supported = true; ret = pci_epf_test_init_dma_chan(epf_test); if (ret) epf_test->dma_supported = false; - if (!linkup_notifier && !core_init_notifier) - queue_work(kpcitest_workqueue, &epf_test->cmd_handler.work); - return 0; } diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c index 0ea64e24ed61..3b21e28f9b59 100644 --- a/drivers/pci/endpoint/pci-ep-cfs.c +++ b/drivers/pci/endpoint/pci-ep-cfs.c @@ -64,6 +64,9 @@ static int pci_secondary_epc_epf_link(struct config_item *epf_item, return ret; } + /* Send any pending EPC initialization complete to the EPF driver */ + pci_epc_notify_pending_init(epc, epf); + return 0; } @@ -125,6 +128,9 @@ static int pci_primary_epc_epf_link(struct config_item *epf_item, return ret; } + /* Send any pending EPC initialization complete to the EPF driver */ + pci_epc_notify_pending_init(epc, epf); + return 0; } @@ -230,6 +236,9 @@ static int pci_epc_epf_link(struct config_item *epc_item, return ret; } + /* Send any pending EPC initialization complete to the EPF driver */ + pci_epc_notify_pending_init(epc, epf); + return 0; } diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c index dcd4e66430c1..ba2ff037dfa6 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -753,10 +753,32 @@ void pci_epc_init_notify(struct pci_epc *epc) epf->event_ops->core_init(epf); mutex_unlock(&epf->lock); } + epc->init_complete = true; mutex_unlock(&epc->list_lock); } EXPORT_SYMBOL_GPL(pci_epc_init_notify); +/** + * pci_epc_notify_pending_init() - Notify the pending EPC device initialization + * complete to the EPF device + * @epc: the EPC device whose core initialization is pending to be notified + * @epf: the EPF device to be notified + * + * Invoke to notify the pending EPC device initialization complete to the EPF + * device. This is used to deliver the notification if the EPC initialization + * got completed before the EPF driver bind. + */ +void pci_epc_notify_pending_init(struct pci_epc *epc, struct pci_epf *epf) +{ + if (epc->init_complete) { + mutex_lock(&epf->lock); + if (epf->event_ops && epf->event_ops->core_init) + epf->event_ops->core_init(epf); + mutex_unlock(&epf->lock); + } +} +EXPORT_SYMBOL_GPL(pci_epc_notify_pending_init); + /** * pci_epc_bme_notify() - Notify the EPF device that the EPC device has received * the BME event from the Root complex diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h index 40ea18f5aa02..adee6dbe4e45 100644 --- a/include/linux/pci-epc.h +++ b/include/linux/pci-epc.h @@ -128,6 +128,8 @@ struct pci_epc_mem { * @group: configfs group representing the PCI EPC device * @lock: mutex to protect pci_epc ops * @function_num_map: bitmap to manage physical function number + * @init_complete: flag to indicate whether the EPC initialization is complete + * or not */ struct pci_epc { struct device dev; @@ -143,13 +145,12 @@ struct pci_epc { /* mutex to protect against concurrent access of EP controller */ struct mutex lock; unsigned long function_num_map; + bool init_complete; }; /** * struct pci_epc_features - features supported by a EPC device per function * @linkup_notifier: indicate if the EPC device can notify EPF driver on link up - * @core_init_notifier: indicate cores that can notify about their availability - * for initialization * @msi_capable: indicate if the endpoint function has MSI capability * @msix_capable: indicate if the endpoint function has MSI-X capability * @reserved_bar: bitmap to indicate reserved BAR unavailable to function driver @@ -159,7 +160,6 @@ struct pci_epc { */ struct pci_epc_features { unsigned int linkup_notifier : 1; - unsigned int core_init_notifier : 1; unsigned int msi_capable : 1; unsigned int msix_capable : 1; u8 reserved_bar; @@ -198,6 +198,7 @@ int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf, void pci_epc_linkup(struct pci_epc *epc); void pci_epc_linkdown(struct pci_epc *epc); void pci_epc_init_notify(struct pci_epc *epc); +void pci_epc_notify_pending_init(struct pci_epc *epc, struct pci_epf *epf); void pci_epc_bme_notify(struct pci_epc *epc); void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf, enum pci_epc_interface_type type);
"core_init_notifier" flag is set by the glue drivers requiring refclk from the host to complete the DWC core initialization. Also, those drivers will send a notification to the EPF drivers once the initialization is fully completed using the pci_epc_init_notify() API. Only then, the EPF drivers will start functioning. For the rest of the drivers generating refclk locally, EPF drivers will start functioning post binding with them. EPF drivers rely on the 'core_init_notifier' flag to differentiate between the drivers. Unfortunately, this creates two different flows for the EPF drivers. So to avoid that, let's get rid of the "core_init_notifier" flag and follow a single initialization flow for the EPF drivers. This is done by calling the dw_pcie_ep_init_notify() from all glue drivers after the completion of dw_pcie_ep_init_registers() API. This will allow all the glue drivers to send the notification to the EPF drivers once the initialization is fully completed. Only difference here is that, the drivers requiring refclk from host will send the notification once refclk is received, while others will send it during probe time itself. But this also requires the EPC core driver to deliver the notification after EPF driver bind. Because, the glue driver can send the notification before the EPF drivers bind() and in those cases the EPF drivers will miss the event. To accommodate this, EPC core is now caching the state of the EPC initialization in 'init_complete' flag and pci-ep-cfs driver sends the notification to EPF drivers based on that after each EPF driver bind. Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> --- drivers/pci/controller/dwc/pci-dra7xx.c | 2 ++ drivers/pci/controller/dwc/pci-imx6.c | 2 ++ drivers/pci/controller/dwc/pci-keystone.c | 2 ++ drivers/pci/controller/dwc/pci-layerscape-ep.c | 2 ++ drivers/pci/controller/dwc/pcie-artpec6.c | 2 ++ drivers/pci/controller/dwc/pcie-designware-plat.c | 2 ++ drivers/pci/controller/dwc/pcie-keembay.c | 2 ++ drivers/pci/controller/dwc/pcie-qcom-ep.c | 1 - drivers/pci/controller/dwc/pcie-rcar-gen4.c | 2 ++ drivers/pci/controller/dwc/pcie-tegra194.c | 1 - drivers/pci/controller/dwc/pcie-uniphier-ep.c | 2 ++ drivers/pci/endpoint/functions/pci-epf-test.c | 18 +++++------------- drivers/pci/endpoint/pci-ep-cfs.c | 9 +++++++++ drivers/pci/endpoint/pci-epc-core.c | 22 ++++++++++++++++++++++ include/linux/pci-epc.h | 7 ++++--- 15 files changed, 58 insertions(+), 18 deletions(-)