drm/radeon/kms: Add support for interrupts on r6xx/r7xx chips (v3)
This enables the use of interrupts on r6xx/r7xx hardware.
Interrupts are implemented via a ring buffer. The GPU adds
interrupts vectors to the ring and the host reads them off
in the interrupt handler. The interrupt controller requires
firmware like the CP. This firmware must be installed and
accessble to the firmware loader for interrupts to function.
MSIs don't seem to work on my RS780. They work fine on all
my discrete cards. I'm not sure about other RS780s or
RS880s. I've disabled MSIs on RS780 and RS880, but it would
probably be worth checking on some other systems.
v2 - fix some checkpatch.pl problems;
re-read the disp int status reg if we restart the ih;
v3 - remove the irq handler if r600_irq_init() fails;
remove spinlock in r600_ih_ring_fini();
move ih rb overflow check to r600_get_ih_wptr();
move irq ack to separate function;
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 15b9e03..0b8dad6 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -399,6 +399,23 @@
bool ready;
};
+/*
+ * R6xx+ IH ring
+ */
+struct r600_ih {
+ struct radeon_object *ring_obj;
+ volatile uint32_t *ring;
+ unsigned rptr;
+ unsigned wptr;
+ unsigned wptr_old;
+ unsigned ring_size;
+ uint64_t gpu_addr;
+ uint32_t align_mask;
+ uint32_t ptr_mask;
+ spinlock_t lock;
+ bool enabled;
+};
+
struct r600_blit {
struct radeon_object *shader_obj;
u64 shader_gpu_addr;
@@ -792,8 +809,10 @@
struct radeon_surface_reg surface_regs[RADEON_GEM_MAX_SURFACES];
const struct firmware *me_fw; /* all family ME firmware */
const struct firmware *pfp_fw; /* r6/700 PFP firmware */
+ const struct firmware *rlc_fw; /* r6/700 RLC firmware */
struct r600_blit r600_blit;
int msi_enabled; /* msi enabled */
+ struct r600_ih ih; /* r6/700 interrupt ring */
};
int radeon_device_init(struct radeon_device *rdev,
@@ -1108,7 +1127,12 @@
extern void r600_scratch_init(struct radeon_device *rdev);
extern int r600_blit_init(struct radeon_device *rdev);
extern void r600_blit_fini(struct radeon_device *rdev);
-extern int r600_cp_init_microcode(struct radeon_device *rdev);
+extern int r600_init_microcode(struct radeon_device *rdev);
extern int r600_gpu_reset(struct radeon_device *rdev);
+/* r600 irq */
+extern int r600_irq_init(struct radeon_device *rdev);
+extern void r600_irq_fini(struct radeon_device *rdev);
+extern void r600_ih_ring_init(struct radeon_device *rdev, unsigned ring_size);
+extern int r600_irq_set(struct radeon_device *rdev);
#endif