[PATCH v15 5/8] cxl/pci: Factor out interrupt policy check

[Anisa Su]

From: Ira Weiny <iweiny@xxxxxxxxxx>

Dynamic Capacity Devices (DCD) require event interrupts to process
memory addition or removal.  BIOS may have control over non-DCD event
processing.  DCD interrupt configuration needs to be separate from
memory event interrupt configuration.

Factor out check for firmware ownership of memory event logs.

Link: https://lore.kernel.org/all/663922b475e50_d54d72945b@xxxxxxxxxxxxxxxxxxxxxxxxx.notmuch/ [1]
Suggested-by: Dan Williams <djbw@xxxxxxxxxx>
Signed-off-by: Ira Weiny <iweiny@xxxxxxxxxx>
Signed-off-by: Anisa Su <anisa.su@xxxxxxxxxxx>
Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx>
Reviewed-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Reviewed-by: Fan Ni <nifan.cxl@xxxxxxxxx>
Reviewed-by: Li Ming <ming.li@xxxxxxxxxxxx>
Reviewed-by: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Reviewed-by: Alison Schofield <alison.schofield@xxxxxxxxx>
Reviewed-by: Richard Cheng <icheng@xxxxxxxxxx>
---
 drivers/cxl/pci.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
index 4867657f5526..7b754af2168d 100644
--- a/drivers/cxl/pci.c
+++ b/drivers/cxl/pci.c
@@ -640,6 +640,14 @@ static bool cxl_event_int_is_fw(u8 setting)
 	return mode == CXL_INT_FW;
 }
 
+static bool cxl_event_fw_owns_mem_logs(struct cxl_event_interrupt_policy *policy)
+{
+	return cxl_event_int_is_fw(policy->info_settings) ||
+	       cxl_event_int_is_fw(policy->warn_settings) ||
+	       cxl_event_int_is_fw(policy->failure_settings) ||
+	       cxl_event_int_is_fw(policy->fatal_settings);
+}
+
 static int cxl_event_config(struct pci_host_bridge *host_bridge,
 			    struct cxl_memdev_state *mds, bool irq_avail)
 {
@@ -662,10 +670,7 @@ static int cxl_event_config(struct pci_host_bridge *host_bridge,
 	if (rc)
 		return rc;
 
-	if (cxl_event_int_is_fw(policy.info_settings) ||
-	    cxl_event_int_is_fw(policy.warn_settings) ||
-	    cxl_event_int_is_fw(policy.failure_settings) ||
-	    cxl_event_int_is_fw(policy.fatal_settings)) {
+	if (cxl_event_fw_owns_mem_logs(&policy)) {
 		dev_err(mds->cxlds.dev,
 			"FW still in control of Event Logs despite _OSC settings\n");
 		return -EBUSY;
-- 
2.43.0