Reviewed-by: Monk Liu <monk.liu@xxxxxxx>
_____________________________________
Monk Liu|GPU Virtualization Team |AMD
-----Original Message-----
From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Emily Deng
Sent: Wednesday, February 26, 2020 12:34 PM
To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: Deng, Emily <Emily.Deng@xxxxxxx>
Subject: [PATCH] drm/amdgpu/sriov: Use kiq to copy the gpu clock
For vega10 sriov, the register is blocked, use copy data command to fix the issue.
Signed-off-by: Emily Deng <Emily.Deng@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 68 +++++++++++++++++++++++++++++------
1 file changed, 58 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 1c7a16b..71df0d9 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -3963,6 +3963,63 @@ static int gfx_v9_0_soft_reset(void *handle)
return 0;
}
+static uint64_t amdgpu_kiq_read_clock(struct amdgpu_device *adev) {
+ signed long r, cnt = 0;
+ unsigned long flags;
+ uint32_t seq;
+ struct amdgpu_kiq *kiq = &adev->gfx.kiq;
+ struct amdgpu_ring *ring = &kiq->ring;
+
+ BUG_ON(!ring->funcs->emit_rreg);
+
+ spin_lock_irqsave(&kiq->ring_lock, flags);
+ amdgpu_ring_alloc(ring, 32);
+ amdgpu_ring_write(ring, PACKET3(PACKET3_COPY_DATA, 4));
+ amdgpu_ring_write(ring, 9 | /* src: register*/
+ (5 << 8) | /* dst: memory */
+ (1 << 16) | /* count sel */
+ (1 << 20)); /* write confirm */
+ amdgpu_ring_write(ring, 0);
+ amdgpu_ring_write(ring, 0);
+ amdgpu_ring_write(ring, lower_32_bits(adev->wb.gpu_addr +
+ kiq->reg_val_offs * 4));
+ amdgpu_ring_write(ring, upper_32_bits(adev->wb.gpu_addr +
+ kiq->reg_val_offs * 4));
+ amdgpu_fence_emit_polling(ring, &seq);
+ amdgpu_ring_commit(ring);
+ spin_unlock_irqrestore(&kiq->ring_lock, flags);
+
+ r = amdgpu_fence_wait_polling(ring, seq, MAX_KIQ_REG_WAIT);
+
+ /* don't wait anymore for gpu reset case because this way may
+ * block gpu_recover() routine forever, e.g. this virt_kiq_rreg
+ * is triggered in TTM and ttm_bo_lock_delayed_workqueue() will
+ * never return if we keep waiting in virt_kiq_rreg, which cause
+ * gpu_recover() hang there.
+ *
+ * also don't wait anymore for IRQ context
+ * */
+ if (r < 1 && (adev->in_gpu_reset || in_interrupt()))
+ goto failed_kiq_read;
+
+ might_sleep();
+ while (r < 1 && cnt++ < MAX_KIQ_REG_TRY) {
+ msleep(MAX_KIQ_REG_BAILOUT_INTERVAL);
+ r = amdgpu_fence_wait_polling(ring, seq, MAX_KIQ_REG_WAIT);
+ }
+
+ if (cnt > MAX_KIQ_REG_TRY)
+ goto failed_kiq_read;
+
+ return (uint64_t)adev->wb.wb[kiq->reg_val_offs] |
+ (uint64_t)adev->wb.wb[kiq->reg_val_offs + 1 ] << 32ULL;
+
+failed_kiq_read:
+ pr_err("failed to read gpu clock\n");
+ return ~0;
+}
+
static uint64_t gfx_v9_0_get_gpu_clock_counter(struct amdgpu_device *adev) {
uint64_t clock;
@@ -3970,16 +4027,7 @@ static uint64_t gfx_v9_0_get_gpu_clock_counter(struct amdgpu_device *adev)
amdgpu_gfx_off_ctrl(adev, false);
mutex_lock(&adev->gfx.gpu_clock_mutex);
if (adev->asic_type == CHIP_VEGA10 && amdgpu_sriov_runtime(adev)) {
- uint32_t tmp, lsb, msb, i = 0;
- do {
- if (i != 0)
- udelay(1);
- tmp = RREG32_SOC15(GC, 0, mmRLC_REFCLOCK_TIMESTAMP_MSB);
- lsb = RREG32_SOC15(GC, 0, mmRLC_REFCLOCK_TIMESTAMP_LSB);
- msb = RREG32_SOC15(GC, 0, mmRLC_REFCLOCK_TIMESTAMP_MSB);
- i++;
- } while (unlikely(tmp != msb) && (i < adev->usec_timeout));
- clock = (uint64_t)lsb | ((uint64_t)msb << 32ULL);
+ clock = amdgpu_kiq_read_clock(adev);
} else {
WREG32_SOC15(GC, 0, mmRLC_CAPTURE_GPU_CLOCK_COUNT, 1);
clock = (uint64_t)RREG32_SOC15(GC, 0, mmRLC_GPU_CLOCK_COUNT_LSB) |
--
2.7.4
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