drivers/gpu/drm/amd/amdgpu/ih_v6_1.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/amd/amdgpu/ih_v6_1.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/amd/amdgpu/ih_v6_1.c
Extension
.c
Size
23050 bytes
Lines
797
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (ih[i]->ring_size) {
			r = ih_v6_1_toggle_ring_interrupts(adev, ih[i], enable);
			if (r)
				return r;
		}
	}

	return 0;
}

static uint32_t ih_v6_1_rb_cntl(struct amdgpu_ih_ring *ih, uint32_t ih_rb_cntl)
{
	int rb_bufsz = order_base_2(ih->ring_size / 4);

	ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL,
				   MC_SPACE, ih->use_bus_addr ? 2 : 4);
	ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL,
				   WPTR_OVERFLOW_CLEAR, 1);
	ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL,
				   WPTR_OVERFLOW_ENABLE, 1);
	ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_SIZE, rb_bufsz);
	/* Ring Buffer write pointer writeback. If enabled, IH_RB_WPTR register
	 * value is written to memory
	 */
	ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL,
				   WPTR_WRITEBACK_ENABLE, 1);
	ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_SNOOP, 1);
	ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_RO, 0);
	ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_VMID, 0);

	return ih_rb_cntl;
}

static uint32_t ih_v6_1_doorbell_rptr(struct amdgpu_ih_ring *ih)
{
	u32 ih_doorbell_rtpr = 0;

	if (ih->use_doorbell) {
		ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr,
						 IH_DOORBELL_RPTR, OFFSET,
						 ih->doorbell_index);
		ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr,
						 IH_DOORBELL_RPTR,
						 ENABLE, 1);
	} else {
		ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr,
						 IH_DOORBELL_RPTR,
						 ENABLE, 0);
	}
	return ih_doorbell_rtpr;
}

/**
 * ih_v6_1_enable_ring - enable an ih ring buffer
 *
 * @adev: amdgpu_device pointer
 * @ih: amdgpu_ih_ring pointer
 *
 * Enable an ih ring buffer (IH_V6_0)
 */
static int ih_v6_1_enable_ring(struct amdgpu_device *adev,
				      struct amdgpu_ih_ring *ih)
{
	struct amdgpu_ih_regs *ih_regs;
	uint32_t tmp;

	ih_regs = &ih->ih_regs;

	/* Ring Buffer base. [39:8] of 40-bit address of the beginning of the ring buffer*/
	WREG32(ih_regs->ih_rb_base, ih->gpu_addr >> 8);
	WREG32(ih_regs->ih_rb_base_hi, (ih->gpu_addr >> 40) & 0xff);

	tmp = RREG32(ih_regs->ih_rb_cntl);
	tmp = ih_v6_1_rb_cntl(ih, tmp);
	if (ih == &adev->irq.ih)
		tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, RPTR_REARM, !!adev->irq.msi_enabled);
	if (ih == &adev->irq.ih1) {
		tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_ENABLE, 0);
		tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, RB_FULL_DRAIN_ENABLE, 1);
	}

	if (amdgpu_sriov_vf(adev) && amdgpu_sriov_reg_indirect_ih(adev)) {
		if (psp_reg_program(&adev->psp, ih_regs->psp_reg_id, tmp)) {
			DRM_ERROR("PSP program IH_RB_CNTL failed!\n");
			return -ETIMEDOUT;
		}
	} else {
		WREG32(ih_regs->ih_rb_cntl, tmp);
	}

Annotation

Implementation Notes