[PATCH v1 4/7] powerpc/kernel Add EEH operations to notify resume
Alexey Kardashevskiy
aik at ozlabs.ru
Mon Dec 18 16:02:56 AEDT 2017
On 14/12/17 02:32, Bryant G. Ly wrote:
> When pseries SR-IOV is enabled and after a PF driver
> has resumed from EEH, platform has to be notified
> of the event so the child VFs can be allowed to
> resume their normal recovery path.
>
> This patch makes the EEH operation allow unfreeze
> platform dependent code and adds the call to
> pseries EEH code.
>
> Signed-off-by: Bryant G. Ly <bryantly at linux.vnet.ibm.com>
> Signed-off-by: Juan J. Alvarez <jjalvare at linux.vnet.ibm.com>
> ---
> arch/powerpc/include/asm/eeh.h | 1 +
> arch/powerpc/kernel/eeh_driver.c | 4 ++
> arch/powerpc/platforms/powernv/eeh-powernv.c | 3 +-
> arch/powerpc/platforms/pseries/eeh_pseries.c | 100 ++++++++++++++++++++++++++-
> 4 files changed, 106 insertions(+), 2 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
> index 5161c37dd039..12d52a0cd447 100644
> --- a/arch/powerpc/include/asm/eeh.h
> +++ b/arch/powerpc/include/asm/eeh.h
> @@ -214,6 +214,7 @@ struct eeh_ops {
> int (*write_config)(struct pci_dn *pdn, int where, int size, u32 val);
> int (*next_error)(struct eeh_pe **pe);
> int (*restore_config)(struct pci_dn *pdn);
> + int (*notify_resume)(struct pci_dn *pdn);
> };
>
> extern int eeh_subsystem_flags;
> diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c
> index c61bf770282b..dbda0cda559b 100644
> --- a/arch/powerpc/kernel/eeh_driver.c
> +++ b/arch/powerpc/kernel/eeh_driver.c
> @@ -361,6 +361,7 @@ static void *eeh_report_resume(void *data, void *userdata)
> bool was_in_error;
> struct pci_driver *driver;
> char *envp[] = {"EVENT=EEH_RESUME", "ONLINE=1", NULL};
> + struct pci_dn *pdn = eeh_dev_to_pdn(edev);
>
> if (!dev || eeh_dev_removed(edev) || eeh_pe_passed(edev->pe))
> return NULL;
> @@ -384,6 +385,9 @@ static void *eeh_report_resume(void *data, void *userdata)
> driver->err_handler->resume(dev);
> eeh_pcid_put(dev);
> kobject_uevent_env(&dev->dev.kobj, KOBJ_CHANGE, envp);
> +#ifdef CONFIG_PCI_IOV
> + eeh_ops->notify_resume(pdn);
eeh_ops->notify_resume(eeh_dev_to_pdn(edev));
otherwise the compiler will complain at @pdn declaration if
!defined(CONFIG_PCI_IOV). Just try compiling without CONFIG_PCI_IOV.
> +#endif
> return NULL;
> }
>
> diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
> index 961e64115d92..8575b3a29e7c 100644
> --- a/arch/powerpc/platforms/powernv/eeh-powernv.c
> +++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
> @@ -1763,7 +1763,8 @@ static struct eeh_ops pnv_eeh_ops = {
> .read_config = pnv_eeh_read_config,
> .write_config = pnv_eeh_write_config,
> .next_error = pnv_eeh_next_error,
> - .restore_config = pnv_eeh_restore_config
> + .restore_config = pnv_eeh_restore_config,
> + .notify_resume = NULL
.notify_resume is NULL already.
> };
>
> #ifdef CONFIG_PCI_IOV
> diff --git a/arch/powerpc/platforms/pseries/eeh_pseries.c b/arch/powerpc/platforms/pseries/eeh_pseries.c
> index 5bdd1678a9ff..2b36fbf4ce74 100644
> --- a/arch/powerpc/platforms/pseries/eeh_pseries.c
> +++ b/arch/powerpc/platforms/pseries/eeh_pseries.c
> @@ -798,6 +798,103 @@ static int pseries_eeh_restore_config(struct pci_dn *pdn)
> return 0;
> }
>
> +#ifdef CONFIG_PCI_IOV
> +int pseries_send_allow_unfreeze(struct eeh_pe *pe,
> + u16 *vf_pe_array, int cur_vfs)
> +{
> + int rc, config_addr;
> + int ibm_allow_unfreeze = rtas_token("ibm,open-sriov-allow-unfreeze");
> +
> + config_addr = pe->config_addr;
@config_addr is pointless - it is used just once, even pr_warn few lines
below uses pe->config_addr.
> + spin_lock(&rtas_data_buf_lock);
> + memcpy(rtas_data_buf, vf_pe_array, RTAS_DATA_BUF_SIZE);
> + rc = rtas_call(ibm_allow_unfreeze, 5, 1, NULL,
> + config_addr,
> + BUID_HI(pe->phb->buid),
> + BUID_LO(pe->phb->buid),
> + rtas_data_buf, cur_vfs * sizeof(u16));
> + spin_unlock(&rtas_data_buf_lock);
> + if (rc)
> + pr_warn("%s: Failed to allow unfreeze for PHB#%x-PE#%x, rc=%x\n",
> + __func__,
> + pe->phb->global_number,
> + pe->config_addr, rc);
> + return rc;
> +}
> +
> +static int pseries_call_allow_unfreeze(struct eeh_dev *edev)
> +{
> + struct eeh_pe *pe;
> + struct pci_dn *pdn, *tmp, *parent, *physfn_pdn;
> + int cur_vfs, rc, vf_index;
> + u16 *vf_pe_array;
> +
> + vf_pe_array = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
> + if (!vf_pe_array)
> + return -ENOMEM;
> +
> + memset(vf_pe_array, 0, RTAS_DATA_BUF_SIZE);
"z" from kzalloc says it reset the memory.
> + cur_vfs = 0;
> + rc = 0;
> + if (edev->pdev->is_physfn) {
> + pe = eeh_dev_to_pe(edev);
> + cur_vfs = pci_num_vf(edev->pdev);
> + pdn = eeh_dev_to_pdn(edev);
> + parent = pdn->parent;
> + /* For each of its VF
> + * call allow unfreeze
> + */
> + for (vf_index = 0; vf_index < cur_vfs; vf_index++)
> + vf_pe_array[vf_index] =
> + be16_to_cpu(pdn->pe_num_map[vf_index]);
It is kind of assumed that the number of VFs is always less than 2048 minus
rtas call parameters (RTAS_DATA_BUF_SIZE==4096 now)?
Is the upper limit of cur_vfs checked anywhere?
We can afford 4K on stack if we know for sure this is all we n
> +
> + rc = pseries_send_allow_unfreeze(pe, vf_pe_array, cur_vfs);
> + pdn->last_allow_rc = rc;
Is this PF or VF pdn (I assume PF)?
> + for (vf_index = 0; vf_index < cur_vfs; vf_index++) {
> + list_for_each_entry_safe(pdn, tmp, &parent->child_list,
> + list) {
> + if (pdn->busno
> + != pci_iov_virtfn_bus(edev->pdev,
> + vf_index) ||
> + pdn->devfn
> + != pci_iov_virtfn_devfn(edev->pdev,
> + vf_index))
> + continue;
> + pdn->last_allow_rc = rc;
I am missing the point of copying last_allow_rc - cannot
eeh_notify_resume_show() just return it from the PF?
May be just add another flag to eeh_pe::state for last_allow_rc? How many
different @rc do we expect here?
> + }
> + }
> + } else {
> + pdn = pci_get_pdn(edev->pdev);
> + vf_pe_array[0] = be16_to_cpu(pdn->pe_number);
> + physfn_pdn = pci_get_pdn(edev->physfn);
Way too many spaces, why? :)
> + edev = pdn_to_eeh_dev(physfn_pdn);
> + pe = eeh_dev_to_pe(edev);
> + rc = pseries_send_allow_unfreeze(pe, vf_pe_array, 1);
> + pdn->last_allow_rc = rc;
> + }
> +
> + kfree(vf_pe_array);
> + return rc;
> +}
> +
> +static int pseries_notify_resume(struct pci_dn *pdn)
> +{
> + struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
> +
> + if (!edev)
> + return -EEXIST;
> +
> + if (rtas_token("ibm,open-sriov-allow-unfreeze")
> + == RTAS_UNKNOWN_SERVICE)
> + return -EINVAL;
Is this the only possible error code?
> +
> + if (edev->pdev->is_physfn || edev->pdev->is_virtfn)
> + return pseries_call_allow_unfreeze(edev);
> +
> + return 0;
> +}
> +#endif
> +
> static struct eeh_ops pseries_eeh_ops = {
> .name = "pseries",
> .init = pseries_eeh_init,
> @@ -813,7 +910,8 @@ static struct eeh_ops pseries_eeh_ops = {
> .read_config = pseries_eeh_read_config,
> .write_config = pseries_eeh_write_config,
> .next_error = NULL,
> - .restore_config = pseries_eeh_restore_config
> + .restore_config = pseries_eeh_restore_config,
> + .notify_resume = pseries_notify_resume
> };
>
> /**
>
--
Alexey
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