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SubjectRe: [PATCH 4/4] PCI: pci-epf-test: Add support to defer core initialization
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Hi,

On 13/11/19 2:38 PM, Vidya Sagar wrote:
> Add support to defer core initialization and to receive a notifier
> when core is ready to accommodate platforms where core is not for
> initialization untile reference clock from host is available.
>
> Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
> ---
> drivers/pci/endpoint/functions/pci-epf-test.c | 114 ++++++++++++------
> 1 file changed, 77 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
> index bddff15052cc..068024fab544 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
> @@ -360,18 +360,6 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
> msecs_to_jiffies(1));
> }
>
> -static int pci_epf_test_notifier(struct notifier_block *nb, unsigned long val,
> - void *data)
> -{
> - struct pci_epf *epf = container_of(nb, struct pci_epf, nb);
> - struct pci_epf_test *epf_test = epf_get_drvdata(epf);
> -
> - queue_delayed_work(kpcitest_workqueue, &epf_test->cmd_handler,
> - msecs_to_jiffies(1));
> -
> - return NOTIFY_OK;
> -}
> -
> static void pci_epf_test_unbind(struct pci_epf *epf)
> {
> struct pci_epf_test *epf_test = epf_get_drvdata(epf);
> @@ -428,6 +416,78 @@ static int pci_epf_test_set_bar(struct pci_epf *epf)
> return 0;
> }
>
> +static int pci_epf_test_core_init(struct pci_epf *epf)
> +{
> + struct pci_epf_header *header = epf->header;
> + const struct pci_epc_features *epc_features;
> + struct pci_epc *epc = epf->epc;
> + struct device *dev = &epf->dev;
> + bool msix_capable = false;
> + bool msi_capable = true;
> + int ret;
> +
> + epc_features = pci_epc_get_features(epc, epf->func_no);
> + if (epc_features) {
> + msix_capable = epc_features->msix_capable;
> + msi_capable = epc_features->msi_capable;
> + }
> +
> + ret = pci_epc_write_header(epc, epf->func_no, header);
> + if (ret) {
> + dev_err(dev, "Configuration header write failed\n");
> + return ret;
> + }
> +
> + ret = pci_epf_test_set_bar(epf);
> + if (ret)
> + return ret;
> +
> + if (msi_capable) {
> + ret = pci_epc_set_msi(epc, epf->func_no, epf->msi_interrupts);
> + if (ret) {
> + dev_err(dev, "MSI configuration failed\n");
> + return ret;
> + }
> + }
> +
> + if (msix_capable) {
> + ret = pci_epc_set_msix(epc, epf->func_no, epf->msix_interrupts);
> + if (ret) {
> + dev_err(dev, "MSI-X configuration failed\n");
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int pci_epf_test_notifier(struct notifier_block *nb, unsigned long val,
> + void *data)
> +{
> + struct pci_epf *epf = container_of(nb, struct pci_epf, nb);
> + struct pci_epf_test *epf_test = epf_get_drvdata(epf);
> + int ret;
> +
> + switch (val) {
> + case CORE_INIT:
> + ret = pci_epf_test_core_init(epf);
> + if (ret)
> + return NOTIFY_BAD;
> + break;
> +
> + case LINK_UP:
> + queue_delayed_work(kpcitest_workqueue, &epf_test->cmd_handler,
> + msecs_to_jiffies(1));
> + break;
> +
> + default:
> + dev_err(&epf->dev, "Invalid EPF test notifier event\n");
> + return NOTIFY_BAD;
> + }
> +
> + return NOTIFY_OK;
> +}
> +
> static int pci_epf_test_alloc_space(struct pci_epf *epf)
> {
> struct pci_epf_test *epf_test = epf_get_drvdata(epf);
> @@ -496,12 +556,11 @@ static int pci_epf_test_bind(struct pci_epf *epf)
> {
> int ret;
> struct pci_epf_test *epf_test = epf_get_drvdata(epf);
> - struct pci_epf_header *header = epf->header;
> const struct pci_epc_features *epc_features;
> enum pci_barno test_reg_bar = BAR_0;
> struct pci_epc *epc = epf->epc;
> - struct device *dev = &epf->dev;
> bool linkup_notifier = false;
> + bool skip_core_init = false;
> bool msix_capable = false;
> bool msi_capable = true;
>
> @@ -511,6 +570,7 @@ static int pci_epf_test_bind(struct pci_epf *epf)
> epc_features = pci_epc_get_features(epc, epf->func_no);
> if (epc_features) {
> linkup_notifier = epc_features->linkup_notifier;
> + skip_core_init = epc_features->skip_core_init;
> msix_capable = epc_features->msix_capable;
> msi_capable = epc_features->msi_capable;

Are these used anywhere in this function?
> test_reg_bar = pci_epc_get_first_free_bar(epc_features);
> @@ -520,34 +580,14 @@ static int pci_epf_test_bind(struct pci_epf *epf)
> epf_test->test_reg_bar = test_reg_bar;
> epf_test->epc_features = epc_features;
>
> - ret = pci_epc_write_header(epc, epf->func_no, header);
> - if (ret) {
> - dev_err(dev, "Configuration header write failed\n");
> - return ret;
> - }
> -
> ret = pci_epf_test_alloc_space(epf);
> if (ret)
> return ret;
>
> - ret = pci_epf_test_set_bar(epf);
> - if (ret)
> - return ret;
> -
> - if (msi_capable) {
> - ret = pci_epc_set_msi(epc, epf->func_no, epf->msi_interrupts);
> - if (ret) {
> - dev_err(dev, "MSI configuration failed\n");
> - return ret;
> - }
> - }
> -
> - if (msix_capable) {
> - ret = pci_epc_set_msix(epc, epf->func_no, epf->msix_interrupts);
> - if (ret) {
> - dev_err(dev, "MSI-X configuration failed\n");
> + if (!skip_core_init) {
> + ret = pci_epf_test_core_init(epf);
> + if (ret)
> return ret;
> - }
> }
>
> if (linkup_notifier) {

This could as well be moved to pci_epf_test_core_init().

Thanks
Kishon

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