[PATCH] cxl: Fix is_page_fault() for POWER9

[Christophe Lombard]

From: Christophe Lombard <christophe_lombard at fr.ibm.cm>

The function is_page_fault(), for POWER9, lists the Translation Checkout
Responses where the page fault will be handled by copro_handle_mm_fault().
This list is too restrictive and not necessary.

This patches removes this restriction and all page faults, whatever the
reason, will be handled. In this case, the interruption is always
acknowledged.

Signed-off-by: Christophe Lombard <clombard at linux.vnet.ibm.com>

---
This patch applies on top of this patch:
 https://git.kernel.org/powerpc/c/3ced8d73006321bd2a0412fa0ff4b0
---
 drivers/misc/cxl/fault.c | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/drivers/misc/cxl/fault.c b/drivers/misc/cxl/fault.c
index 6eed7d0..0cf7f4a 100644
--- a/drivers/misc/cxl/fault.c
+++ b/drivers/misc/cxl/fault.c
@@ -204,22 +204,11 @@ static bool cxl_is_segment_miss(struct cxl_context *ctx, u64 dsisr)
 
 static bool cxl_is_page_fault(struct cxl_context *ctx, u64 dsisr)
 {
-	u64 crs; /* Translation Checkout Response Status */
-
 	if ((cxl_is_power8()) && (dsisr & CXL_PSL_DSISR_An_DM))
 		return true;
 
-	if (cxl_is_power9()) {
-		crs = (dsisr & CXL_PSL9_DSISR_An_CO_MASK);
-		if ((crs == CXL_PSL9_DSISR_An_PF_SLR) ||
-		    (crs == CXL_PSL9_DSISR_An_PF_RGC) ||
-		    (crs == CXL_PSL9_DSISR_An_PF_RGP) ||
-		    (crs == CXL_PSL9_DSISR_An_PF_HRH) ||
-		    (crs == CXL_PSL9_DSISR_An_PF_STEG) ||
-		    (crs == CXL_PSL9_DSISR_An_URTCH)) {
-			return true;
-		}
-	}
+	if (cxl_is_power9())
+		return true;
 
 	return false;
 }
-- 
2.7.4