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Message-ID: <jb4iq364iqwk3swux5cjiczyvdyrkjtqjclefyfjrntepvroyn@7vbvbzu3pd3p>
Date: Thu, 17 Apr 2025 11:09:21 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Lukas Wunner <lukas@...ner.de>
Cc: Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
Oliver O'Halloran <oohall@...il.com>, Bjorn Helgaas <bhelgaas@...gle.com>,
Lorenzo Pieralisi <lpieralisi@...nel.org>, Krzysztof Wilczy??ski <kw@...ux.com>,
Rob Herring <robh@...nel.org>, dingwei@...vell.com, cassel@...nel.org,
Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>, linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 2/4] PCI/ERR: Add support for resetting the slot in a
platforms specific way
On Thu, Apr 17, 2025 at 02:23:26AM +0200, Lukas Wunner wrote:
> On Wed, Apr 16, 2025 at 08:34:21PM +0530, Manivannan Sadhasivam wrote:
> > I don't think it is possible to get rid of the powerpc version. It has
> > its own pci_dev::sysdata pointing to 'struct pci_controller' pointer
> > which is internal to powerpc arch code. And the generic code would need
> > 'struct pci_host_bridge' to access the callback.
>
> Below is my proposal to convert powerpc to the new ->slot_reset() callback.
> Compile-tested only.
>
> Feel free to include this in your series, alternatively I can submit it
> to powerpc maintainers once your series has landed. Thanks!
>
> -- >8 --
>
> From: Lukas Wunner <lukas@...ner.de>
> Subject: [PATCH] powerpc/powernv/pci: Migrate to pci_host_bridge::reset_slot
> callback
>
> struct pci_host_bridge has just been amended with a ->reset_slot()
> callback to allow for a per-host-bridge Secondary Bus Reset procedure.
>
> PowerNV needs a platform-specific reset procedure and has historically
> implemented it by overriding pcibios_reset_secondary_bus().
>
> Migrate PowerNV to the new ->reset_slot() callback for simplicity and
> cleanliness. Assign the callback as soon as the pci_host_bridge is
> allocated through the following call chain:
>
> pcibios_init()
> pcibios_scan_phb()
> pci_create_root_bus()
> pci_register_host_bridge()
> pcibios_root_bridge_prepare()
>
> The powerpc-specific implementation of pcibios_reset_secondary_bus() can
> thus be deleted and the remaining default implementation in the PCI core
> can be made private. The ->reset_secondary_bus() callback in struct
> pci_controller_ops likewise becomes obsolete and can be deleted.
>
Looks good to me, thanks! I think it would be better if it is submitted once my
series has landed in mainline (just to avoid immutable branch hassle between
powerpc and PCI trees).
- Mani
> Signed-off-by: Lukas Wunner <lukas@...ner.de>
> ---
> arch/powerpc/include/asm/pci-bridge.h | 1 -
> arch/powerpc/kernel/pci-common.c | 12 ------------
> arch/powerpc/platforms/powernv/eeh-powernv.c | 14 +++++++++-----
> arch/powerpc/platforms/powernv/pci-ioda.c | 9 +++++++--
> arch/powerpc/platforms/powernv/pci.h | 3 ++-
> drivers/pci/pci.c | 2 +-
> include/linux/pci.h | 1 -
> 7 files changed, 19 insertions(+), 23 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
> index 2aa3a091ef20..0de09fc90641 100644
> --- a/arch/powerpc/include/asm/pci-bridge.h
> +++ b/arch/powerpc/include/asm/pci-bridge.h
> @@ -36,7 +36,6 @@ struct pci_controller_ops {
> unsigned long type);
> void (*setup_bridge)(struct pci_bus *bus,
> unsigned long type);
> - void (*reset_secondary_bus)(struct pci_dev *pdev);
>
> #ifdef CONFIG_PCI_MSI
> int (*setup_msi_irqs)(struct pci_dev *pdev,
> diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
> index eac84d687b53..dad15fbec4e0 100644
> --- a/arch/powerpc/kernel/pci-common.c
> +++ b/arch/powerpc/kernel/pci-common.c
> @@ -233,18 +233,6 @@ void pcibios_setup_bridge(struct pci_bus *bus, unsigned long type)
> hose->controller_ops.setup_bridge(bus, type);
> }
>
> -void pcibios_reset_secondary_bus(struct pci_dev *dev)
> -{
> - struct pci_controller *phb = pci_bus_to_host(dev->bus);
> -
> - if (phb->controller_ops.reset_secondary_bus) {
> - phb->controller_ops.reset_secondary_bus(dev);
> - return;
> - }
> -
> - pci_reset_secondary_bus(dev);
> -}
> -
> resource_size_t pcibios_default_alignment(void)
> {
> if (ppc_md.pcibios_default_alignment)
> diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
> index db3370d1673c..9b9517cb6ab7 100644
> --- a/arch/powerpc/platforms/powernv/eeh-powernv.c
> +++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
> @@ -890,18 +890,22 @@ static int pnv_eeh_bridge_reset(struct pci_dev *pdev, int option)
> return (rc == OPAL_SUCCESS) ? 0 : -EIO;
> }
>
> -void pnv_pci_reset_secondary_bus(struct pci_dev *dev)
> +int pnv_pci_reset_secondary_bus(struct pci_host_bridge *host,
> + struct pci_dev *dev)
> {
> struct pci_controller *hose;
> + int rc_hot, rc_dea;
>
> if (pci_is_root_bus(dev->bus)) {
> hose = pci_bus_to_host(dev->bus);
> - pnv_eeh_root_reset(hose, EEH_RESET_HOT);
> - pnv_eeh_root_reset(hose, EEH_RESET_DEACTIVATE);
> + rc_hot = pnv_eeh_root_reset(hose, EEH_RESET_HOT);
> + rc_dea = pnv_eeh_root_reset(hose, EEH_RESET_DEACTIVATE);
> } else {
> - pnv_eeh_bridge_reset(dev, EEH_RESET_HOT);
> - pnv_eeh_bridge_reset(dev, EEH_RESET_DEACTIVATE);
> + rc_hot = pnv_eeh_bridge_reset(dev, EEH_RESET_HOT);
> + rc_dea = pnv_eeh_bridge_reset(dev, EEH_RESET_DEACTIVATE);
> }
> +
> + return rc_hot ? : rc_dea ? : 0;
> }
>
> static void pnv_eeh_wait_for_pending(struct pci_dn *pdn, const char *type,
> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
> index ae4b549b5ca0..e1b75a4bc681 100644
> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
> @@ -2145,6 +2145,12 @@ static void pnv_pci_ioda_fixup(void)
> #endif
> }
>
> +static int pnv_pci_root_bridge_prepare(struct pci_host_bridge *bridge)
> +{
> + bridge->reset_slot = pnv_pci_reset_secondary_bus;
> + return 0;
> +}
> +
> /*
> * Returns the alignment for I/O or memory windows for P2P
> * bridges. That actually depends on how PEs are segmented.
> @@ -2504,7 +2510,6 @@ static const struct pci_controller_ops pnv_pci_ioda_controller_ops = {
> .release_device = pnv_pci_release_device,
> .window_alignment = pnv_pci_window_alignment,
> .setup_bridge = pnv_pci_fixup_bridge_resources,
> - .reset_secondary_bus = pnv_pci_reset_secondary_bus,
> .shutdown = pnv_pci_ioda_shutdown,
> #ifdef CONFIG_IOMMU_API
> .device_group = pnv_pci_device_group,
> @@ -2515,7 +2520,6 @@ static const struct pci_controller_ops pnv_npu_ocapi_ioda_controller_ops = {
> .enable_device_hook = pnv_ocapi_enable_device_hook,
> .release_device = pnv_pci_release_device,
> .window_alignment = pnv_pci_window_alignment,
> - .reset_secondary_bus = pnv_pci_reset_secondary_bus,
> .shutdown = pnv_pci_ioda_shutdown,
> };
>
> @@ -2724,6 +2728,7 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np,
> }
>
> ppc_md.pcibios_default_alignment = pnv_pci_default_alignment;
> + ppc_md.pcibios_root_bridge_prepare = pnv_pci_root_bridge_prepare;
>
> #ifdef CONFIG_PCI_IOV
> ppc_md.pcibios_fixup_sriov = pnv_pci_ioda_fixup_iov;
> diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h
> index 42075501663b..44e8969c7729 100644
> --- a/arch/powerpc/platforms/powernv/pci.h
> +++ b/arch/powerpc/platforms/powernv/pci.h
> @@ -275,7 +275,8 @@ extern struct iommu_table *pnv_pci_table_alloc(int nid);
>
> extern void pnv_pci_init_ioda2_phb(struct device_node *np);
> extern void pnv_pci_init_npu2_opencapi_phb(struct device_node *np);
> -extern void pnv_pci_reset_secondary_bus(struct pci_dev *dev);
> +extern int pnv_pci_reset_secondary_bus(struct pci_host_bridge *host,
> + struct pci_dev *dev);
> extern int pnv_eeh_phb_reset(struct pci_controller *hose, int option);
>
> extern struct pnv_ioda_pe *pnv_pci_bdfn_to_pe(struct pnv_phb *phb, u16 bdfn);
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 13709bb898a9..fe66d69c6429 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -4980,7 +4980,7 @@ void pci_reset_secondary_bus(struct pci_dev *dev)
> pci_write_config_word(dev, PCI_BRIDGE_CONTROL, ctrl);
> }
>
> -void __weak pcibios_reset_secondary_bus(struct pci_dev *dev)
> +static void pcibios_reset_secondary_bus(struct pci_dev *dev)
> {
> struct pci_host_bridge *host = pci_find_host_bridge(dev->bus);
> int ret;
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 76e977af2d52..43d952361e84 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1398,7 +1398,6 @@ int pci_probe_reset_slot(struct pci_slot *slot);
> int pci_probe_reset_bus(struct pci_bus *bus);
> int pci_reset_bus(struct pci_dev *dev);
> void pci_reset_secondary_bus(struct pci_dev *dev);
> -void pcibios_reset_secondary_bus(struct pci_dev *dev);
> void pci_update_resource(struct pci_dev *dev, int resno);
> int __must_check pci_assign_resource(struct pci_dev *dev, int i);
> void pci_release_resource(struct pci_dev *dev, int resno);
> --
> 2.43.0
>
--
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