/* * Copyright 2014 Advanced Micro Devices, Inc. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. *
*/
/* * Interrupts * Starting with r6xx, interrupts are handled via a ring buffer. * Ring buffers are areas of GPU accessible memory that the GPU * writes interrupt vectors into and the host reads vectors out of. * There is a rptr (read pointer) that determines where the * host is currently reading, and a wptr (write pointer) * which determines where the GPU has written. When the * pointers are equal, the ring is idle. When the GPU * writes vectors to the ring buffer, it increments the * wptr. When there is an interrupt, the host then starts * fetching commands and processing them until the pointers are * equal again at which point it updates the rptr.
*/
/** * iceland_ih_irq_init - init and enable the interrupt ring * * @adev: amdgpu_device pointer * * Allocate a ring buffer for the interrupt controller, * enable the RLC, disable interrupts, enable the IH * ring buffer and enable it (VI). * Called at device load and reume. * Returns 0 for success, errors for failure.
*/ staticint iceland_ih_irq_init(struct amdgpu_device *adev)
{ struct amdgpu_ih_ring *ih = &adev->irq.ih; int rb_bufsz;
u32 interrupt_cntl, ih_cntl, ih_rb_cntl;
/* 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);
/* set the writeback address whether it's enabled or not */
WREG32(mmIH_RB_WPTR_ADDR_LO, lower_32_bits(ih->wptr_addr));
WREG32(mmIH_RB_WPTR_ADDR_HI, upper_32_bits(ih->wptr_addr) & 0xFF);
WREG32(mmIH_RB_CNTL, ih_rb_cntl);
/* set rptr, wptr to 0 */
WREG32(mmIH_RB_RPTR, 0);
WREG32(mmIH_RB_WPTR, 0);
/* Default settings for IH_CNTL (disabled at first) */
ih_cntl = RREG32(mmIH_CNTL);
ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, MC_VMID, 0);
if (adev->irq.msi_enabled)
ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, RPTR_REARM, 1);
WREG32(mmIH_CNTL, ih_cntl);
/** * iceland_ih_get_wptr - get the IH ring buffer wptr * * @adev: amdgpu_device pointer * @ih: IH ring buffer to fetch wptr * * Get the IH ring buffer wptr from either the register * or the writeback memory buffer (VI). Also check for * ring buffer overflow and deal with it. * Used by cz_irq_process(VI). * Returns the value of the wptr.
*/ static u32 iceland_ih_get_wptr(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih)
{
u32 wptr, tmp;
wptr = le32_to_cpu(*ih->wptr_cpu);
if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW)) goto out;
/* Double check that the overflow wasn't already cleared. */
wptr = RREG32(mmIH_RB_WPTR);
if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW)) goto out;
wptr = REG_SET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW, 0); /* When a ring buffer overflow happen start parsing interrupt * from the last not overwritten vector (wptr + 16). Hopefully * this should allow us to catchup.
*/
dev_warn(adev->dev, "IH ring buffer overflow (0x%08X, 0x%08X, 0x%08X)\n",
wptr, ih->rptr, (wptr + 16) & ih->ptr_mask);
ih->rptr = (wptr + 16) & ih->ptr_mask;
tmp = RREG32(mmIH_RB_CNTL);
tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1);
WREG32(mmIH_RB_CNTL, tmp);
/* Unset the CLEAR_OVERFLOW bit immediately so new overflows * can be detected.
*/
tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 0);
WREG32(mmIH_RB_CNTL, tmp);
out: return (wptr & ih->ptr_mask);
}
/** * iceland_ih_decode_iv - decode an interrupt vector * * @adev: amdgpu_device pointer * @ih: IH ring buffer to decode * @entry: IV entry to place decoded information into * * Decodes the interrupt vector at the current rptr * position and also advance the position.
*/ staticvoid iceland_ih_decode_iv(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih, struct amdgpu_iv_entry *entry)
{ /* wptr/rptr are in bytes! */
u32 ring_index = ih->rptr >> 2;
uint32_t dw[4];
/** * iceland_ih_set_rptr - set the IH ring buffer rptr * * @adev: amdgpu_device pointer * @ih: IH ring buffer to set rptr * * Set the IH ring buffer rptr.
*/ staticvoid iceland_ih_set_rptr(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih)
{
WREG32(mmIH_RB_RPTR, ih->rptr);
}
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