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pds_core: implement pci reset handlers

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Implement the callbacks for a nice PCI reset.  These get called
when a user is nice enough to use the sysfs PCI reset entry, e.g.
    echo 1 > /sys/bus/pci/devices/0000:2b:00.0/reset

Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shannon Nelson 2023-09-14 15:31:59 -07:00 committed by David S. Miller
parent d557c094e7
commit ffa5585833
3 changed files with 65 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/net/ethernet/amd/pds_core/core.c
View File

@ -515,7 +515,7 @@ void pdsc_stop(struct pdsc *pdsc)
PDS_CORE_INTR_MASK_SET); PDS_CORE_INTR_MASK_SET);
} }
static void pdsc_fw_down(struct pdsc *pdsc) void pdsc_fw_down(struct pdsc *pdsc)
{ {
union pds_core_notifyq_comp reset_event = { union pds_core_notifyq_comp reset_event = {
.reset.ecode = cpu_to_le16(PDS_EVENT_RESET), .reset.ecode = cpu_to_le16(PDS_EVENT_RESET),
@ -523,10 +523,13 @@ static void pdsc_fw_down(struct pdsc *pdsc)
}; };
if (test_and_set_bit(PDSC_S_FW_DEAD, &pdsc->state)) { if (test_and_set_bit(PDSC_S_FW_DEAD, &pdsc->state)) {
dev_err(pdsc->dev, "%s: already happening\n", __func__); dev_warn(pdsc->dev, "%s: already happening\n", __func__);
return; return;
} }
if (pdsc->pdev->is_virtfn)
return;
/* Notify clients of fw_down */ /* Notify clients of fw_down */
if (pdsc->fw_reporter) if (pdsc->fw_reporter)
devlink_health_report(pdsc->fw_reporter, "FW down reported", pdsc); devlink_health_report(pdsc->fw_reporter, "FW down reported", pdsc);
@ -536,7 +539,7 @@ static void pdsc_fw_down(struct pdsc *pdsc)
pdsc_teardown(pdsc, PDSC_TEARDOWN_RECOVERY); pdsc_teardown(pdsc, PDSC_TEARDOWN_RECOVERY);
} }
static void pdsc_fw_up(struct pdsc *pdsc) void pdsc_fw_up(struct pdsc *pdsc)
{ {
union pds_core_notifyq_comp reset_event = { union pds_core_notifyq_comp reset_event = {
.reset.ecode = cpu_to_le16(PDS_EVENT_RESET), .reset.ecode = cpu_to_le16(PDS_EVENT_RESET),
@ -549,6 +552,11 @@ static void pdsc_fw_up(struct pdsc *pdsc)
return; return;
} }
if (pdsc->pdev->is_virtfn) {
clear_bit(PDSC_S_FW_DEAD, &pdsc->state);
return;
}
err = pdsc_setup(pdsc, PDSC_SETUP_RECOVERY); err = pdsc_setup(pdsc, PDSC_SETUP_RECOVERY);
if (err) if (err)
goto err_out; goto err_out;

4
drivers/net/ethernet/amd/pds_core/core.h
View File

@ -309,4 +309,8 @@ irqreturn_t pdsc_adminq_isr(int irq, void *data);
int pdsc_firmware_update(struct pdsc *pdsc, const struct firmware *fw, int pdsc_firmware_update(struct pdsc *pdsc, const struct firmware *fw,
struct netlink_ext_ack *extack); struct netlink_ext_ack *extack);
void pdsc_fw_down(struct pdsc *pdsc);
void pdsc_fw_up(struct pdsc *pdsc);
#endif /* _PDSC_H_ */ #endif /* _PDSC_H_ */

50
drivers/net/ethernet/amd/pds_core/main.c
View File

@ -445,12 +445,62 @@ static void pdsc_remove(struct pci_dev *pdev)
devlink_free(dl); devlink_free(dl);
} }
static void pdsc_reset_prepare(struct pci_dev *pdev)
{
struct pdsc *pdsc = pci_get_drvdata(pdev);
pdsc_fw_down(pdsc);
pci_free_irq_vectors(pdev);
pdsc_unmap_bars(pdsc);
pci_release_regions(pdev);
pci_disable_device(pdev);
}
static void pdsc_reset_done(struct pci_dev *pdev)
{
struct pdsc *pdsc = pci_get_drvdata(pdev);
struct device *dev = pdsc->dev;
int err;
err = pci_enable_device(pdev);
if (err) {
dev_err(dev, "Cannot enable PCI device: %pe\n", ERR_PTR(err));
return;
}
pci_set_master(pdev);
if (!pdev->is_virtfn) {
pcie_print_link_status(pdsc->pdev);
err = pci_request_regions(pdsc->pdev, PDS_CORE_DRV_NAME);
if (err) {
dev_err(pdsc->dev, "Cannot request PCI regions: %pe\n",
ERR_PTR(err));
return;
}
err = pdsc_map_bars(pdsc);
if (err)
return;
}
pdsc_fw_up(pdsc);
}
static const struct pci_error_handlers pdsc_err_handler = {
/* FLR handling */
.reset_prepare = pdsc_reset_prepare,
.reset_done = pdsc_reset_done,
};
static struct pci_driver pdsc_driver = { static struct pci_driver pdsc_driver = {
.name = PDS_CORE_DRV_NAME, .name = PDS_CORE_DRV_NAME,
.id_table = pdsc_id_table, .id_table = pdsc_id_table,
.probe = pdsc_probe, .probe = pdsc_probe,
.remove = pdsc_remove, .remove = pdsc_remove,
.sriov_configure = pdsc_sriov_configure, .sriov_configure = pdsc_sriov_configure,
.err_handler = &pdsc_err_handler,
}; };
void *pdsc_get_pf_struct(struct pci_dev *vf_pdev) void *pdsc_get_pf_struct(struct pci_dev *vf_pdev)