drm/etnaviv: handle MMU exception in IRQ handler

Bit 30 of the interrupt status signals an MMU exception. Handle this
condition properly and dump some useful registers.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

2 files changed, 20 insertions, 4 deletions

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
index 9b61be847d45..39b5be3916d5 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -1363,6 +1363,21 @@ static irqreturn_t irq_handler(int irq, void *data)
                         intr &= ~VIVS_HI_INTR_ACKNOWLEDGE_AXI_BUS_ERROR;
                 }
 
+                if (intr & VIVS_HI_INTR_ACKNOWLEDGE_MMU_EXCEPTION) {
+                        int i;
+
+                        dev_err_ratelimited(gpu->dev,
+                                "MMU fault status 0x%08x\n",
+                                gpu_read(gpu, VIVS_MMUv2_STATUS));
+                        for (i = 0; i < 4; i++) {
+                                dev_err_ratelimited(gpu->dev,
+                                        "MMU %d fault addr 0x%08x\n",
+                                        i, gpu_read(gpu,
+                                        VIVS_MMUv2_EXCEPTION_ADDR(i)));
+                        }
+                        intr &= ~VIVS_HI_INTR_ACKNOWLEDGE_MMU_EXCEPTION;
+                }
+
                 while ((event = ffs(intr)) != 0) {
                         struct fence *fence;
 
diff --git a/drivers/gpu/drm/etnaviv/state_hi.xml.h b/drivers/gpu/drm/etnaviv/state_hi.xml.h
index 807a3d9e0dd5..43c73e2ed34f 100644
--- a/drivers/gpu/drm/etnaviv/state_hi.xml.h
+++ b/drivers/gpu/drm/etnaviv/state_hi.xml.h
@@ -8,10 +8,10 @@ http://0x04.net/cgit/index.cgi/rules-ng-ng
 git clone git://0x04.net/rules-ng-ng
 
 The rules-ng-ng source files this header was generated from are:
-- state_hi.xml (  24309 bytes, from 2015-12-12 09:02:53)
-- common.xml   (  18437 bytes, from 2015-12-12 09:02:53)
+- state_hi.xml (  25620 bytes, from 2016-08-19 22:07:37)
+- common.xml   (  20583 bytes, from 2016-06-07 05:22:38)
 
-Copyright (C) 2015
+Copyright (C) 2016
 */
 
 
@@ -78,9 +78,10 @@ Copyright (C) 2015
 #define VIVS_HI_AXI_STATUS_DET_RD_ERR                           0x00000200
 
 #define VIVS_HI_INTR_ACKNOWLEDGE                                0x00000010
-#define VIVS_HI_INTR_ACKNOWLEDGE_INTR_VEC__MASK                 0x7fffffff
+#define VIVS_HI_INTR_ACKNOWLEDGE_INTR_VEC__MASK                 0x3fffffff
 #define VIVS_HI_INTR_ACKNOWLEDGE_INTR_VEC__SHIFT                0
 #define VIVS_HI_INTR_ACKNOWLEDGE_INTR_VEC(x)                    (((x) << VIVS_HI_INTR_ACKNOWLEDGE_INTR_VEC__SHIFT) & VIVS_HI_INTR_ACKNOWLEDGE_INTR_VEC__MASK)
+#define VIVS_HI_INTR_ACKNOWLEDGE_MMU_EXCEPTION                  0x40000000
 #define VIVS_HI_INTR_ACKNOWLEDGE_AXI_BUS_ERROR                  0x80000000
 
 #define VIVS_HI_INTR_ENBL                                       0x00000014