powerpc/vas: Report proper error code for address translation failure

P9 DD2 NX workbook (Table 4-36) says DMA controller uses CC=5
internally for translation fault handling. NX reserves CC=250 for
OS to notify user space when NX encounters address translation
failure on the request buffer. Not an issue in earlier releases
as NX does not get faults on kernel addresses.

This patch defines CSB_CC_FAULT_ADDRESS(250) and updates CSB.CC with
this proper error code for user space.

Fixes: c96c4436aba4 ("powerpc/vas: Update CSB and notify process for fault CRBs")
Signed-off-by: Haren Myneni <haren@linux.ibm.com>
[mpe: Added Fixes tag and fix typo in comment]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/019fd53e7538c6f8f332d175df74b1815ef5aa8c.camel@linux.ibm.com

diff --git a/Documentation/powerpc/vas-api.rst b/Documentation/powerpc/vas-api.rst
index 1217c2f..788dc83 100644 (file)
--- a/Documentation/powerpc/vas-api.rst
+++ b/Documentation/powerpc/vas-api.rst
@@ -213,7 +213,7 @@ request buffers are not in memory. The operating system handles the fault by
 updating CSB with the following data:
 
        csb.flags = CSB_V;
-       csb.cc = CSB_CC_TRANSLATION;
+       csb.cc = CSB_CC_FAULT_ADDRESS;
        csb.ce = CSB_CE_TERMINATION;
        csb.address = fault_address;
 

diff --git a/arch/powerpc/include/asm/icswx.h b/arch/powerpc/include/asm/icswx.h
index 965b1f3..b0c70a3 100644 (file)
--- a/arch/powerpc/include/asm/icswx.h
+++ b/arch/powerpc/include/asm/icswx.h
@@ -77,6 +77,8 @@ struct coprocessor_completion_block {
 #define CSB_CC_CHAIN           (37)
 #define CSB_CC_SEQUENCE                (38)
 #define CSB_CC_HW              (39)
+/* P9 DD2 NX Workbook 3.2 (Table 4-36): Address translation fault */
+#define        CSB_CC_FAULT_ADDRESS    (250)
 
 #define CSB_SIZE               (0x10)
 #define CSB_ALIGN              CSB_SIZE

diff --git a/arch/powerpc/platforms/powernv/vas-fault.c b/arch/powerpc/platforms/powernv/vas-fault.c
index 266a6ca..3d21fce 100644 (file)
--- a/arch/powerpc/platforms/powernv/vas-fault.c
+++ b/arch/powerpc/platforms/powernv/vas-fault.c
@@ -79,7 +79,7 @@ static void update_csb(struct vas_window *window,
        csb_addr = (void __user *)be64_to_cpu(crb->csb_addr);
 
        memset(&csb, 0, sizeof(csb));
-       csb.cc = CSB_CC_TRANSLATION;
+       csb.cc = CSB_CC_FAULT_ADDRESS;
        csb.ce = CSB_CE_TERMINATION;
        csb.cs = 0;
        csb.count = 0;