drm/panfrost: Do the exception -> string translation using a table

Do the exception -> string translation using a table. This way we get
rid of those magic numbers and can easily add new fields if we need
to attach extra information to exception types.

v4:
* Don't expose exception type to userspace
* Merge the enum definition and the enum -> string table declaration
  in the same patch

v3:
* Drop the error field

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210630062751.2832545-7-boris.brezillon@collabora.com

1 files changed, 82 insertions, 46 deletions

diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
index f7f5ca94f910..cd76d2ff5034 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.c
+++ b/drivers/gpu/drm/panfrost/panfrost_device.c
@@ -292,55 +292,91 @@ void panfrost_device_fini(struct panfrost_device *pfdev)
 	panfrost_clk_fini(pfdev);
 }
 
+#define PANFROST_EXCEPTION(id) \
+	[DRM_PANFROST_EXCEPTION_ ## id] = { \
+		.name = #id, \
+	}
+
+struct panfrost_exception_info {
+	const char *name;
+};
+
+static const struct panfrost_exception_info panfrost_exception_infos[] = {
+	PANFROST_EXCEPTION(OK),
+	PANFROST_EXCEPTION(DONE),
+	PANFROST_EXCEPTION(INTERRUPTED),
+	PANFROST_EXCEPTION(STOPPED),
+	PANFROST_EXCEPTION(TERMINATED),
+	PANFROST_EXCEPTION(KABOOM),
+	PANFROST_EXCEPTION(EUREKA),
+	PANFROST_EXCEPTION(ACTIVE),
+	PANFROST_EXCEPTION(JOB_CONFIG_FAULT),
+	PANFROST_EXCEPTION(JOB_POWER_FAULT),
+	PANFROST_EXCEPTION(JOB_READ_FAULT),
+	PANFROST_EXCEPTION(JOB_WRITE_FAULT),
+	PANFROST_EXCEPTION(JOB_AFFINITY_FAULT),
+	PANFROST_EXCEPTION(JOB_BUS_FAULT),
+	PANFROST_EXCEPTION(INSTR_INVALID_PC),
+	PANFROST_EXCEPTION(INSTR_INVALID_ENC),
+	PANFROST_EXCEPTION(INSTR_TYPE_MISMATCH),
+	PANFROST_EXCEPTION(INSTR_OPERAND_FAULT),
+	PANFROST_EXCEPTION(INSTR_TLS_FAULT),
+	PANFROST_EXCEPTION(INSTR_BARRIER_FAULT),
+	PANFROST_EXCEPTION(INSTR_ALIGN_FAULT),
+	PANFROST_EXCEPTION(DATA_INVALID_FAULT),
+	PANFROST_EXCEPTION(TILE_RANGE_FAULT),
+	PANFROST_EXCEPTION(ADDR_RANGE_FAULT),
+	PANFROST_EXCEPTION(IMPRECISE_FAULT),
+	PANFROST_EXCEPTION(OOM),
+	PANFROST_EXCEPTION(OOM_AFBC),
+	PANFROST_EXCEPTION(UNKNOWN),
+	PANFROST_EXCEPTION(DELAYED_BUS_FAULT),
+	PANFROST_EXCEPTION(GPU_SHAREABILITY_FAULT),
+	PANFROST_EXCEPTION(SYS_SHAREABILITY_FAULT),
+	PANFROST_EXCEPTION(GPU_CACHEABILITY_FAULT),
+	PANFROST_EXCEPTION(TRANSLATION_FAULT_0),
+	PANFROST_EXCEPTION(TRANSLATION_FAULT_1),
+	PANFROST_EXCEPTION(TRANSLATION_FAULT_2),
+	PANFROST_EXCEPTION(TRANSLATION_FAULT_3),
+	PANFROST_EXCEPTION(TRANSLATION_FAULT_4),
+	PANFROST_EXCEPTION(TRANSLATION_FAULT_IDENTITY),
+	PANFROST_EXCEPTION(PERM_FAULT_0),
+	PANFROST_EXCEPTION(PERM_FAULT_1),
+	PANFROST_EXCEPTION(PERM_FAULT_2),
+	PANFROST_EXCEPTION(PERM_FAULT_3),
+	PANFROST_EXCEPTION(TRANSTAB_BUS_FAULT_0),
+	PANFROST_EXCEPTION(TRANSTAB_BUS_FAULT_1),
+	PANFROST_EXCEPTION(TRANSTAB_BUS_FAULT_2),
+	PANFROST_EXCEPTION(TRANSTAB_BUS_FAULT_3),
+	PANFROST_EXCEPTION(ACCESS_FLAG_0),
+	PANFROST_EXCEPTION(ACCESS_FLAG_1),
+	PANFROST_EXCEPTION(ACCESS_FLAG_2),
+	PANFROST_EXCEPTION(ACCESS_FLAG_3),
+	PANFROST_EXCEPTION(ADDR_SIZE_FAULT_IN0),
+	PANFROST_EXCEPTION(ADDR_SIZE_FAULT_IN1),
+	PANFROST_EXCEPTION(ADDR_SIZE_FAULT_IN2),
+	PANFROST_EXCEPTION(ADDR_SIZE_FAULT_IN3),
+	PANFROST_EXCEPTION(ADDR_SIZE_FAULT_OUT0),
+	PANFROST_EXCEPTION(ADDR_SIZE_FAULT_OUT1),
+	PANFROST_EXCEPTION(ADDR_SIZE_FAULT_OUT2),
+	PANFROST_EXCEPTION(ADDR_SIZE_FAULT_OUT3),
+	PANFROST_EXCEPTION(MEM_ATTR_FAULT_0),
+	PANFROST_EXCEPTION(MEM_ATTR_FAULT_1),
+	PANFROST_EXCEPTION(MEM_ATTR_FAULT_2),
+	PANFROST_EXCEPTION(MEM_ATTR_FAULT_3),
+	PANFROST_EXCEPTION(MEM_ATTR_NONCACHE_0),
+	PANFROST_EXCEPTION(MEM_ATTR_NONCACHE_1),
+	PANFROST_EXCEPTION(MEM_ATTR_NONCACHE_2),
+	PANFROST_EXCEPTION(MEM_ATTR_NONCACHE_3),
+};
+
 const char *panfrost_exception_name(u32 exception_code)
 {
-	switch (exception_code) {
-		/* Non-Fault Status code */
-	case 0x00: return "NOT_STARTED/IDLE/OK";
-	case 0x01: return "DONE";
-	case 0x02: return "INTERRUPTED";
-	case 0x03: return "STOPPED";
-	case 0x04: return "TERMINATED";
-	case 0x08: return "ACTIVE";
-		/* Job exceptions */
-	case 0x40: return "JOB_CONFIG_FAULT";
-	case 0x41: return "JOB_POWER_FAULT";
-	case 0x42: return "JOB_READ_FAULT";
-	case 0x43: return "JOB_WRITE_FAULT";
-	case 0x44: return "JOB_AFFINITY_FAULT";
-	case 0x48: return "JOB_BUS_FAULT";
-	case 0x50: return "INSTR_INVALID_PC";
-	case 0x51: return "INSTR_INVALID_ENC";
-	case 0x52: return "INSTR_TYPE_MISMATCH";
-	case 0x53: return "INSTR_OPERAND_FAULT";
-	case 0x54: return "INSTR_TLS_FAULT";
-	case 0x55: return "INSTR_BARRIER_FAULT";
-	case 0x56: return "INSTR_ALIGN_FAULT";
-	case 0x58: return "DATA_INVALID_FAULT";
-	case 0x59: return "TILE_RANGE_FAULT";
-	case 0x5A: return "ADDR_RANGE_FAULT";
-	case 0x60: return "OUT_OF_MEMORY";
-		/* GPU exceptions */
-	case 0x80: return "DELAYED_BUS_FAULT";
-	case 0x88: return "SHAREABILITY_FAULT";
-		/* MMU exceptions */
-	case 0xC1: return "TRANSLATION_FAULT_LEVEL1";
-	case 0xC2: return "TRANSLATION_FAULT_LEVEL2";
-	case 0xC3: return "TRANSLATION_FAULT_LEVEL3";
-	case 0xC4: return "TRANSLATION_FAULT_LEVEL4";
-	case 0xC8: return "PERMISSION_FAULT";
-	case 0xC9 ... 0xCF: return "PERMISSION_FAULT";
-	case 0xD1: return "TRANSTAB_BUS_FAULT_LEVEL1";
-	case 0xD2: return "TRANSTAB_BUS_FAULT_LEVEL2";
-	case 0xD3: return "TRANSTAB_BUS_FAULT_LEVEL3";
-	case 0xD4: return "TRANSTAB_BUS_FAULT_LEVEL4";
-	case 0xD8: return "ACCESS_FLAG";
-	case 0xD9 ... 0xDF: return "ACCESS_FLAG";
-	case 0xE0 ... 0xE7: return "ADDRESS_SIZE_FAULT";
-	case 0xE8 ... 0xEF: return "MEMORY_ATTRIBUTES_FAULT";
-	}
+	if (WARN_ON(exception_code >= ARRAY_SIZE(panfrost_exception_infos) ||
+		    !panfrost_exception_infos[exception_code].name))
+		return "Unknown exception type";
 
-	return "UNKNOWN";
+	return panfrost_exception_infos[exception_code].name;
 }
 
 void panfrost_device_reset(struct panfrost_device *pfdev)