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drm/radeon/kms: Add initial support for async DMA on evergreen
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Pretty similar to 6xx/7xx except the count field increased in the
packet header and the max IB size increased.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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Alex Deucher committed Dec 10, 2012
1 parent 4d75658 commit 233d1ad
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Showing 4 changed files with 248 additions and 9 deletions.
181 changes: 178 additions & 3 deletions drivers/gpu/drm/radeon/evergreen.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2034,6 +2034,7 @@ static void evergreen_gpu_init(struct radeon_device *rdev)
WREG32(GB_ADDR_CONFIG, gb_addr_config);
WREG32(DMIF_ADDR_CONFIG, gb_addr_config);
WREG32(HDP_ADDR_CONFIG, gb_addr_config);
WREG32(DMA_TILING_CONFIG, gb_addr_config);

tmp = gb_addr_config & NUM_PIPES_MASK;
tmp = r6xx_remap_render_backend(rdev, tmp, rdev->config.evergreen.max_backends,
Expand Down Expand Up @@ -2405,6 +2406,8 @@ void evergreen_disable_interrupt_state(struct radeon_device *rdev)
cayman_cp_int_cntl_setup(rdev, 2, 0);
} else
WREG32(CP_INT_CNTL, CNTX_BUSY_INT_ENABLE | CNTX_EMPTY_INT_ENABLE);
tmp = RREG32(DMA_CNTL) & ~TRAP_ENABLE;
WREG32(DMA_CNTL, tmp);
WREG32(GRBM_INT_CNTL, 0);
WREG32(INT_MASK + EVERGREEN_CRTC0_REGISTER_OFFSET, 0);
WREG32(INT_MASK + EVERGREEN_CRTC1_REGISTER_OFFSET, 0);
Expand Down Expand Up @@ -2457,6 +2460,7 @@ int evergreen_irq_set(struct radeon_device *rdev)
u32 grbm_int_cntl = 0;
u32 grph1 = 0, grph2 = 0, grph3 = 0, grph4 = 0, grph5 = 0, grph6 = 0;
u32 afmt1 = 0, afmt2 = 0, afmt3 = 0, afmt4 = 0, afmt5 = 0, afmt6 = 0;
u32 dma_cntl;

if (!rdev->irq.installed) {
WARN(1, "Can't enable IRQ/MSI because no handler is installed\n");
Expand Down Expand Up @@ -2484,6 +2488,8 @@ int evergreen_irq_set(struct radeon_device *rdev)
afmt5 = RREG32(AFMT_AUDIO_PACKET_CONTROL + EVERGREEN_CRTC4_REGISTER_OFFSET) & ~AFMT_AZ_FORMAT_WTRIG_MASK;
afmt6 = RREG32(AFMT_AUDIO_PACKET_CONTROL + EVERGREEN_CRTC5_REGISTER_OFFSET) & ~AFMT_AZ_FORMAT_WTRIG_MASK;

dma_cntl = RREG32(DMA_CNTL) & ~TRAP_ENABLE;

if (rdev->family >= CHIP_CAYMAN) {
/* enable CP interrupts on all rings */
if (atomic_read(&rdev->irq.ring_int[RADEON_RING_TYPE_GFX_INDEX])) {
Expand All @@ -2506,6 +2512,11 @@ int evergreen_irq_set(struct radeon_device *rdev)
}
}

if (atomic_read(&rdev->irq.ring_int[R600_RING_TYPE_DMA_INDEX])) {
DRM_DEBUG("r600_irq_set: sw int dma\n");
dma_cntl |= TRAP_ENABLE;
}

if (rdev->irq.crtc_vblank_int[0] ||
atomic_read(&rdev->irq.pflip[0])) {
DRM_DEBUG("evergreen_irq_set: vblank 0\n");
Expand Down Expand Up @@ -2591,6 +2602,9 @@ int evergreen_irq_set(struct radeon_device *rdev)
cayman_cp_int_cntl_setup(rdev, 2, cp_int_cntl2);
} else
WREG32(CP_INT_CNTL, cp_int_cntl);

WREG32(DMA_CNTL, dma_cntl);

WREG32(GRBM_INT_CNTL, grbm_int_cntl);

WREG32(INT_MASK + EVERGREEN_CRTC0_REGISTER_OFFSET, crtc1);
Expand Down Expand Up @@ -3126,6 +3140,10 @@ int evergreen_irq_process(struct radeon_device *rdev)
} else
radeon_fence_process(rdev, RADEON_RING_TYPE_GFX_INDEX);
break;
case 224: /* DMA trap event */
DRM_DEBUG("IH: DMA trap\n");
radeon_fence_process(rdev, R600_RING_TYPE_DMA_INDEX);
break;
case 233: /* GUI IDLE */
DRM_DEBUG("IH: GUI idle\n");
break;
Expand Down Expand Up @@ -3154,6 +3172,143 @@ int evergreen_irq_process(struct radeon_device *rdev)
return IRQ_HANDLED;
}

/**
* evergreen_dma_fence_ring_emit - emit a fence on the DMA ring
*
* @rdev: radeon_device pointer
* @fence: radeon fence object
*
* Add a DMA fence packet to the ring to write
* the fence seq number and DMA trap packet to generate
* an interrupt if needed (evergreen-SI).
*/
void evergreen_dma_fence_ring_emit(struct radeon_device *rdev,
struct radeon_fence *fence)
{
struct radeon_ring *ring = &rdev->ring[fence->ring];
u64 addr = rdev->fence_drv[fence->ring].gpu_addr;
/* write the fence */
radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_FENCE, 0, 0, 0));
radeon_ring_write(ring, addr & 0xfffffffc);
radeon_ring_write(ring, (upper_32_bits(addr) & 0xff));
radeon_ring_write(ring, fence->seq);
/* generate an interrupt */
radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_TRAP, 0, 0, 0));
/* flush HDP */
radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_SRBM_WRITE, 0, 0, 0));
radeon_ring_write(ring, (0xf << 16) | HDP_MEM_COHERENCY_FLUSH_CNTL);
radeon_ring_write(ring, 1);
}

/**
* evergreen_dma_ring_ib_execute - schedule an IB on the DMA engine
*
* @rdev: radeon_device pointer
* @ib: IB object to schedule
*
* Schedule an IB in the DMA ring (evergreen).
*/
void evergreen_dma_ring_ib_execute(struct radeon_device *rdev,
struct radeon_ib *ib)
{
struct radeon_ring *ring = &rdev->ring[ib->ring];

if (rdev->wb.enabled) {
u32 next_rptr = ring->wptr + 4;
while ((next_rptr & 7) != 5)
next_rptr++;
next_rptr += 3;
radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_WRITE, 0, 0, 1));
radeon_ring_write(ring, ring->next_rptr_gpu_addr & 0xfffffffc);
radeon_ring_write(ring, upper_32_bits(ring->next_rptr_gpu_addr) & 0xff);
radeon_ring_write(ring, next_rptr);
}

/* The indirect buffer packet must end on an 8 DW boundary in the DMA ring.
* Pad as necessary with NOPs.
*/
while ((ring->wptr & 7) != 5)
radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_NOP, 0, 0, 0));
radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_INDIRECT_BUFFER, 0, 0, 0));
radeon_ring_write(ring, (ib->gpu_addr & 0xFFFFFFE0));
radeon_ring_write(ring, (ib->length_dw << 12) | (upper_32_bits(ib->gpu_addr) & 0xFF));

}

/**
* evergreen_copy_dma - copy pages using the DMA engine
*
* @rdev: radeon_device pointer
* @src_offset: src GPU address
* @dst_offset: dst GPU address
* @num_gpu_pages: number of GPU pages to xfer
* @fence: radeon fence object
*
* Copy GPU paging using the DMA engine (evergreen-cayman).
* Used by the radeon ttm implementation to move pages if
* registered as the asic copy callback.
*/
int evergreen_copy_dma(struct radeon_device *rdev,
uint64_t src_offset, uint64_t dst_offset,
unsigned num_gpu_pages,
struct radeon_fence **fence)
{
struct radeon_semaphore *sem = NULL;
int ring_index = rdev->asic->copy.dma_ring_index;
struct radeon_ring *ring = &rdev->ring[ring_index];
u32 size_in_dw, cur_size_in_dw;
int i, num_loops;
int r = 0;

r = radeon_semaphore_create(rdev, &sem);
if (r) {
DRM_ERROR("radeon: moving bo (%d).\n", r);
return r;
}

size_in_dw = (num_gpu_pages << RADEON_GPU_PAGE_SHIFT) / 4;
num_loops = DIV_ROUND_UP(size_in_dw, 0xfffff);
r = radeon_ring_lock(rdev, ring, num_loops * 5 + 11);
if (r) {
DRM_ERROR("radeon: moving bo (%d).\n", r);
radeon_semaphore_free(rdev, &sem, NULL);
return r;
}

if (radeon_fence_need_sync(*fence, ring->idx)) {
radeon_semaphore_sync_rings(rdev, sem, (*fence)->ring,
ring->idx);
radeon_fence_note_sync(*fence, ring->idx);
} else {
radeon_semaphore_free(rdev, &sem, NULL);
}

for (i = 0; i < num_loops; i++) {
cur_size_in_dw = size_in_dw;
if (cur_size_in_dw > 0xFFFFF)
cur_size_in_dw = 0xFFFFF;
size_in_dw -= cur_size_in_dw;
radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_COPY, 0, 0, cur_size_in_dw));
radeon_ring_write(ring, dst_offset & 0xfffffffc);
radeon_ring_write(ring, src_offset & 0xfffffffc);
radeon_ring_write(ring, upper_32_bits(dst_offset) & 0xff);
radeon_ring_write(ring, upper_32_bits(src_offset) & 0xff);
src_offset += cur_size_in_dw * 4;
dst_offset += cur_size_in_dw * 4;
}

r = radeon_fence_emit(rdev, fence, ring->idx);
if (r) {
radeon_ring_unlock_undo(rdev, ring);
return r;
}

radeon_ring_unlock_commit(rdev, ring);
radeon_semaphore_free(rdev, &sem, *fence);

return r;
}

static int evergreen_startup(struct radeon_device *rdev)
{
struct radeon_ring *ring = &rdev->ring[RADEON_RING_TYPE_GFX_INDEX];
Expand Down Expand Up @@ -3217,6 +3372,12 @@ static int evergreen_startup(struct radeon_device *rdev)
return r;
}

r = radeon_fence_driver_start_ring(rdev, R600_RING_TYPE_DMA_INDEX);
if (r) {
dev_err(rdev->dev, "failed initializing DMA fences (%d).\n", r);
return r;
}

/* Enable IRQ */
r = r600_irq_init(rdev);
if (r) {
Expand All @@ -3231,10 +3392,21 @@ static int evergreen_startup(struct radeon_device *rdev)
0, 0xfffff, RADEON_CP_PACKET2);
if (r)
return r;

ring = &rdev->ring[R600_RING_TYPE_DMA_INDEX];
r = radeon_ring_init(rdev, ring, ring->ring_size, R600_WB_DMA_RPTR_OFFSET,
DMA_RB_RPTR, DMA_RB_WPTR,
2, 0x3fffc, DMA_PACKET(DMA_PACKET_NOP, 0, 0, 0));
if (r)
return r;

r = evergreen_cp_load_microcode(rdev);
if (r)
return r;
r = evergreen_cp_resume(rdev);
if (r)
return r;
r = r600_dma_resume(rdev);
if (r)
return r;

Expand Down Expand Up @@ -3283,11 +3455,9 @@ int evergreen_resume(struct radeon_device *rdev)

int evergreen_suspend(struct radeon_device *rdev)
{
struct radeon_ring *ring = &rdev->ring[RADEON_RING_TYPE_GFX_INDEX];

r600_audio_fini(rdev);
r700_cp_stop(rdev);
ring->ready = false;
r600_dma_stop(rdev);
evergreen_irq_suspend(rdev);
radeon_wb_disable(rdev);
evergreen_pcie_gart_disable(rdev);
Expand Down Expand Up @@ -3364,6 +3534,9 @@ int evergreen_init(struct radeon_device *rdev)
rdev->ring[RADEON_RING_TYPE_GFX_INDEX].ring_obj = NULL;
r600_ring_init(rdev, &rdev->ring[RADEON_RING_TYPE_GFX_INDEX], 1024 * 1024);

rdev->ring[R600_RING_TYPE_DMA_INDEX].ring_obj = NULL;
r600_ring_init(rdev, &rdev->ring[R600_RING_TYPE_DMA_INDEX], 64 * 1024);

rdev->ih.ring_obj = NULL;
r600_ih_ring_init(rdev, 64 * 1024);

Expand All @@ -3376,6 +3549,7 @@ int evergreen_init(struct radeon_device *rdev)
if (r) {
dev_err(rdev->dev, "disabling GPU acceleration\n");
r700_cp_fini(rdev);
r600_dma_fini(rdev);
r600_irq_fini(rdev);
radeon_wb_fini(rdev);
radeon_ib_pool_fini(rdev);
Expand Down Expand Up @@ -3403,6 +3577,7 @@ void evergreen_fini(struct radeon_device *rdev)
r600_audio_fini(rdev);
r600_blit_fini(rdev);
r700_cp_fini(rdev);
r600_dma_fini(rdev);
r600_irq_fini(rdev);
radeon_wb_fini(rdev);
radeon_ib_pool_fini(rdev);
Expand Down
29 changes: 29 additions & 0 deletions drivers/gpu/drm/radeon/evergreend.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -905,6 +905,35 @@
# define DC_HPDx_RX_INT_TIMER(x) ((x) << 16)
# define DC_HPDx_EN (1 << 28)

/* ASYNC DMA */
#define DMA_RB_RPTR 0xd008
#define DMA_RB_WPTR 0xd00c

#define DMA_CNTL 0xd02c
# define TRAP_ENABLE (1 << 0)
# define SEM_INCOMPLETE_INT_ENABLE (1 << 1)
# define SEM_WAIT_INT_ENABLE (1 << 2)
# define DATA_SWAP_ENABLE (1 << 3)
# define FENCE_SWAP_ENABLE (1 << 4)
# define CTXEMPTY_INT_ENABLE (1 << 28)
#define DMA_TILING_CONFIG 0xD0B8

/* async DMA packets */
#define DMA_PACKET(cmd, t, s, n) ((((cmd) & 0xF) << 28) | \
(((t) & 0x1) << 23) | \
(((s) & 0x1) << 22) | \
(((n) & 0xFFFFF) << 0))
/* async DMA Packet types */
#define DMA_PACKET_WRITE 0x2
#define DMA_PACKET_COPY 0x3
#define DMA_PACKET_INDIRECT_BUFFER 0x4
#define DMA_PACKET_SEMAPHORE 0x5
#define DMA_PACKET_FENCE 0x6
#define DMA_PACKET_TRAP 0x7
#define DMA_PACKET_SRBM_WRITE 0x9
#define DMA_PACKET_CONSTANT_FILL 0xd
#define DMA_PACKET_NOP 0xf

/* PCIE link stuff */
#define PCIE_LC_TRAINING_CNTL 0xa1 /* PCIE_P */
#define PCIE_LC_LINK_WIDTH_CNTL 0xa2 /* PCIE_P */
Expand Down
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