drm/radeon/kms: add evergreen/cayman CS parser for async DMA (v2)

Allows us to use the DMA ring from userspace.
DMA doesn't have a good NOP packet in which to embed the
reloc idx, so userspace has to add a reloc for each
buffer used and order them to match the command stream.

v2: fix address bounds checking
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_asic.c

@@ -1204,7 +1204,7 @@ static struct radeon_asic evergreen_asic = {
 			.ib_execute = &evergreen_dma_ring_ib_execute,
 			.emit_fence = &evergreen_dma_fence_ring_emit,
 			.emit_semaphore = &r600_dma_semaphore_ring_emit,
-			.cs_parse = NULL,
+			.cs_parse = &evergreen_dma_cs_parse,
 			.ring_test = &r600_dma_ring_test,
 			.ib_test = &r600_dma_ib_test,
 			.is_lockup = &r600_dma_is_lockup,
@@ -1288,7 +1288,7 @@ static struct radeon_asic sumo_asic = {
 			.ib_execute = &evergreen_dma_ring_ib_execute,
 			.emit_fence = &evergreen_dma_fence_ring_emit,
 			.emit_semaphore = &r600_dma_semaphore_ring_emit,
-			.cs_parse = NULL,
+			.cs_parse = &evergreen_dma_cs_parse,
 			.ring_test = &r600_dma_ring_test,
 			.ib_test = &r600_dma_ib_test,
 			.is_lockup = &r600_dma_is_lockup,
@@ -1372,7 +1372,7 @@ static struct radeon_asic btc_asic = {
 			.ib_execute = &evergreen_dma_ring_ib_execute,
 			.emit_fence = &evergreen_dma_fence_ring_emit,
 			.emit_semaphore = &r600_dma_semaphore_ring_emit,
-			.cs_parse = NULL,
+			.cs_parse = &evergreen_dma_cs_parse,
 			.ring_test = &r600_dma_ring_test,
 			.ib_test = &r600_dma_ib_test,
 			.is_lockup = &r600_dma_is_lockup,
@@ -1486,7 +1486,7 @@ static struct radeon_asic cayman_asic = {
 			.ib_execute = &cayman_dma_ring_ib_execute,
 			.emit_fence = &evergreen_dma_fence_ring_emit,
 			.emit_semaphore = &r600_dma_semaphore_ring_emit,
-			.cs_parse = NULL,
+			.cs_parse = &evergreen_dma_cs_parse,
 			.ring_test = &r600_dma_ring_test,
 			.ib_test = &r600_dma_ib_test,
 			.is_lockup = &cayman_dma_is_lockup,
@@ -1496,7 +1496,7 @@ static struct radeon_asic cayman_asic = {
 			.ib_execute = &cayman_dma_ring_ib_execute,
 			.emit_fence = &evergreen_dma_fence_ring_emit,
 			.emit_semaphore = &r600_dma_semaphore_ring_emit,
-			.cs_parse = NULL,
+			.cs_parse = &evergreen_dma_cs_parse,
 			.ring_test = &r600_dma_ring_test,
 			.ib_test = &r600_dma_ib_test,
 			.is_lockup = &cayman_dma_is_lockup,
@@ -1611,7 +1611,7 @@ static struct radeon_asic trinity_asic = {
 			.ib_execute = &cayman_dma_ring_ib_execute,
 			.emit_fence = &evergreen_dma_fence_ring_emit,
 			.emit_semaphore = &r600_dma_semaphore_ring_emit,
-			.cs_parse = NULL,
+			.cs_parse = &evergreen_dma_cs_parse,
 			.ring_test = &r600_dma_ring_test,
 			.ib_test = &r600_dma_ib_test,
 			.is_lockup = &cayman_dma_is_lockup,
@@ -1621,7 +1621,7 @@ static struct radeon_asic trinity_asic = {
 			.ib_execute = &cayman_dma_ring_ib_execute,
 			.emit_fence = &evergreen_dma_fence_ring_emit,
 			.emit_semaphore = &r600_dma_semaphore_ring_emit,
-			.cs_parse = NULL,
+			.cs_parse = &evergreen_dma_cs_parse,
 			.ring_test = &r600_dma_ring_test,
 			.ib_test = &r600_dma_ib_test,
 			.is_lockup = &cayman_dma_is_lockup,

drivers/gpu/drm/radeon/radeon_asic.h

@@ -431,6 +431,7 @@ u32 evergreen_get_vblank_counter(struct radeon_device *rdev, int crtc);
 int evergreen_irq_set(struct radeon_device *rdev);
 int evergreen_irq_process(struct radeon_device *rdev);
 extern int evergreen_cs_parse(struct radeon_cs_parser *p);
+extern int evergreen_dma_cs_parse(struct radeon_cs_parser *p);
 extern void evergreen_pm_misc(struct radeon_device *rdev);
 extern void evergreen_pm_prepare(struct radeon_device *rdev);
 extern void evergreen_pm_finish(struct radeon_device *rdev);