drm/i915/uc: Fix undefined behavior due to shift overflowing the constant

Fix:

  In file included from <command-line>:0:0:
  drivers/gpu/drm/i915/gt/uc/intel_guc.c: In function ‘intel_guc_send_mmio’:
  ././include/linux/compiler_types.h:352:38: error: call to ‘__compiletime_assert_1047’ \
  declared with attribute error: FIELD_PREP: mask is not constant
    _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)

and other build errors due to shift overflowing values.

See https://lore.kernel.org/r/YkwQ6%2BtIH8GQpuct@zn.tnic for the gory
details as to why it triggers with older gccs only.

v2 by Jani:
- Drop the i915_reg.h changes

Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Ruiqi GONG <gongruiqi1@huawei.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220518113315.1305027-2-jani.nikula@intel.com
(cherry picked from commit 962bd34bb457f6353f333ce234c3fd34cad1c00a)

diff --git a/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h b/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h
index be9ac47..4ef9990 100644 (file)
--- a/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h
+++ b/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h
@@ -50,7 +50,7 @@
 
 #define HOST2GUC_SELF_CFG_REQUEST_MSG_LEN              (GUC_HXG_REQUEST_MSG_MIN_LEN + 3u)
 #define HOST2GUC_SELF_CFG_REQUEST_MSG_0_MBZ            GUC_HXG_REQUEST_MSG_0_DATA0
-#define HOST2GUC_SELF_CFG_REQUEST_MSG_1_KLV_KEY                (0xffff << 16)
+#define HOST2GUC_SELF_CFG_REQUEST_MSG_1_KLV_KEY                (0xffffU << 16)
 #define HOST2GUC_SELF_CFG_REQUEST_MSG_1_KLV_LEN                (0xffff << 0)
 #define HOST2GUC_SELF_CFG_REQUEST_MSG_2_VALUE32                GUC_HXG_REQUEST_MSG_n_DATAn
 #define HOST2GUC_SELF_CFG_REQUEST_MSG_3_VALUE64                GUC_HXG_REQUEST_MSG_n_DATAn

diff --git a/drivers/gpu/drm/i915/gt/uc/abi/guc_communication_ctb_abi.h b/drivers/gpu/drm/i915/gt/uc/abi/guc_communication_ctb_abi.h
index c9086a6..df83c1c 100644 (file)
--- a/drivers/gpu/drm/i915/gt/uc/abi/guc_communication_ctb_abi.h
+++ b/drivers/gpu/drm/i915/gt/uc/abi/guc_communication_ctb_abi.h
@@ -82,7 +82,7 @@ static_assert(sizeof(struct guc_ct_buffer_desc) == 64);
 #define GUC_CTB_HDR_LEN                                1u
 #define GUC_CTB_MSG_MIN_LEN                    GUC_CTB_HDR_LEN
 #define GUC_CTB_MSG_MAX_LEN                    256u
-#define GUC_CTB_MSG_0_FENCE                    (0xffff << 16)
+#define GUC_CTB_MSG_0_FENCE                    (0xffffU << 16)
 #define GUC_CTB_MSG_0_FORMAT                   (0xf << 12)
 #define   GUC_CTB_FORMAT_HXG                   0u
 #define GUC_CTB_MSG_0_RESERVED                 (0xf << 8)

diff --git a/drivers/gpu/drm/i915/gt/uc/abi/guc_messages_abi.h b/drivers/gpu/drm/i915/gt/uc/abi/guc_messages_abi.h
index 29ac823..7d5ba4d 100644 (file)
--- a/drivers/gpu/drm/i915/gt/uc/abi/guc_messages_abi.h
+++ b/drivers/gpu/drm/i915/gt/uc/abi/guc_messages_abi.h
@@ -40,7 +40,7 @@
  */
 
 #define GUC_HXG_MSG_MIN_LEN                    1u
-#define GUC_HXG_MSG_0_ORIGIN                   (0x1 << 31)
+#define GUC_HXG_MSG_0_ORIGIN                   (0x1U << 31)
 #define   GUC_HXG_ORIGIN_HOST                  0u
 #define   GUC_HXG_ORIGIN_GUC                   1u
 #define GUC_HXG_MSG_0_TYPE                     (0x7 << 28)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_reg.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_reg.h
index 66027a4..ad570fa 100644 (file)
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_reg.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_reg.h
@@ -28,7 +28,7 @@
 #define   GS_MIA_HALT_REQUESTED                  (0x02 << GS_MIA_SHIFT)
 #define   GS_MIA_ISR_ENTRY               (0x04 << GS_MIA_SHIFT)
 #define   GS_AUTH_STATUS_SHIFT         30
-#define   GS_AUTH_STATUS_MASK            (0x03 << GS_AUTH_STATUS_SHIFT)
+#define   GS_AUTH_STATUS_MASK            (0x03U << GS_AUTH_STATUS_SHIFT)
 #define   GS_AUTH_STATUS_BAD             (0x01 << GS_AUTH_STATUS_SHIFT)
 #define   GS_AUTH_STATUS_GOOD            (0x02 << GS_AUTH_STATUS_SHIFT)