/* * Copyright 2012 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.
*/
/** * cik_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 (CIK). * Called at device load and reume. * Returns 0 for success, errors for failure.
*/ staticint cik_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;
/* 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 = (0x10 << IH_CNTL__MC_WRREQ_CREDIT__SHIFT) |
(0x10 << IH_CNTL__MC_WR_CLEAN_CNT__SHIFT) |
(0 << IH_CNTL__MC_VMID__SHIFT); /* IH_CNTL__RPTR_REARM_MASK only works if msi's are enabled */ if (adev->irq.msi_enabled)
ih_cntl |= IH_CNTL__RPTR_REARM_MASK;
WREG32(mmIH_CNTL, ih_cntl);
/** * cik_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 (CIK). Also check for * ring buffer overflow and deal with it. * Used by cik_irq_process(). * Returns the value of the wptr.
*/ static u32 cik_ih_get_wptr(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih)
{
u32 wptr, tmp;
wptr = le32_to_cpu(*ih->wptr_cpu);
if (wptr & IH_RB_WPTR__RB_OVERFLOW_MASK) {
wptr &= ~IH_RB_WPTR__RB_OVERFLOW_MASK; /* 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 |= IH_RB_CNTL__WPTR_OVERFLOW_CLEAR_MASK;
WREG32(mmIH_RB_CNTL, tmp);
/* Unset the CLEAR_OVERFLOW bit immediately so new overflows * can be detected.
*/
tmp &= ~IH_RB_CNTL__WPTR_OVERFLOW_CLEAR_MASK;
WREG32(mmIH_RB_CNTL, tmp);
} return (wptr & ih->ptr_mask);
}
/* CIK IV Ring * Each IV ring entry is 128 bits: * [7:0] - interrupt source id * [31:8] - reserved * [59:32] - interrupt source data * [63:60] - reserved * [71:64] - RINGID * CP: * ME_ID [1:0], PIPE_ID[1:0], QUEUE_ID[2:0] * QUEUE_ID - for compute, which of the 8 queues owned by the dispatcher * - for gfx, hw shader state (0=PS...5=LS, 6=CS) * ME_ID - 0 = gfx, 1 = first 4 CS pipes, 2 = second 4 CS pipes * PIPE_ID - ME0 0=3D * - ME1&2 compute dispatcher (4 pipes each) * SDMA: * INSTANCE_ID [1:0], QUEUE_ID[1:0] * INSTANCE_ID - 0 = sdma0, 1 = sdma1 * QUEUE_ID - 0 = gfx, 1 = rlc0, 2 = rlc1 * [79:72] - VMID * [95:80] - PASID * [127:96] - reserved
*/
/** * cik_ih_decode_iv - decode an interrupt vector * * @adev: amdgpu_device pointer * * Decodes the interrupt vector at the current rptr * position and also advance the position.
*/ staticvoid cik_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];
/** * cik_ih_set_rptr - set the IH ring buffer rptr * * @adev: amdgpu_device pointer * @ih: IH ring buffer to set wptr * * Set the IH ring buffer rptr.
*/ staticvoid cik_ih_set_rptr(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih)
{
WREG32(mmIH_RB_RPTR, ih->rptr);
}
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