--- /dev/null
+/*
+ * 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.
+ *
+ */
+#include "drmP.h"
+#include "amdgpu.h"
+#include "amdgpu_ih.h"
+#include "vid.h"
+
+#include "oss/oss_3_0_1_d.h"
+#include "oss/oss_3_0_1_sh_mask.h"
+
+#include "bif/bif_5_1_d.h"
+#include "bif/bif_5_1_sh_mask.h"
+
+/*
+ * 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.
+ */
+
+static void cz_ih_set_interrupt_funcs(struct amdgpu_device *adev);
+
+/**
+ * cz_ih_enable_interrupts - Enable the interrupt ring buffer
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Enable the interrupt ring buffer (VI).
+ */
+static void cz_ih_enable_interrupts(struct amdgpu_device *adev)
+{
+ u32 ih_cntl = RREG32(mmIH_CNTL);
+ u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL);
+
+ ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, ENABLE_INTR, 1);
+ ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 1);
+ WREG32(mmIH_CNTL, ih_cntl);
+ WREG32(mmIH_RB_CNTL, ih_rb_cntl);
+ adev->irq.ih.enabled = true;
+}
+
+/**
+ * cz_ih_disable_interrupts - Disable the interrupt ring buffer
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Disable the interrupt ring buffer (VI).
+ */
+static void cz_ih_disable_interrupts(struct amdgpu_device *adev)
+{
+ u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL);
+ u32 ih_cntl = RREG32(mmIH_CNTL);
+
+ ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 0);
+ ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, ENABLE_INTR, 0);
+ WREG32(mmIH_RB_CNTL, ih_rb_cntl);
+ WREG32(mmIH_CNTL, ih_cntl);
+ /* set rptr, wptr to 0 */
+ WREG32(mmIH_RB_RPTR, 0);
+ WREG32(mmIH_RB_WPTR, 0);
+ adev->irq.ih.enabled = false;
+ adev->irq.ih.rptr = 0;
+}
+
+/**
+ * cz_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.
+ */
+static int cz_ih_irq_init(struct amdgpu_device *adev)
+{
+ int ret = 0;
+ int rb_bufsz;
+ u32 interrupt_cntl, ih_cntl, ih_rb_cntl;
+ u64 wptr_off;
+
+ /* disable irqs */
+ cz_ih_disable_interrupts(adev);
+
+ /* setup interrupt control */
+ WREG32(mmINTERRUPT_CNTL2, adev->dummy_page.addr >> 8);
+ interrupt_cntl = RREG32(mmINTERRUPT_CNTL);
+ /* INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=0 - dummy read disabled with msi, enabled without msi
+ * INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=1 - dummy read controlled by IH_DUMMY_RD_EN
+ */
+ interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_DUMMY_RD_OVERRIDE, 0);
+ /* INTERRUPT_CNTL__IH_REQ_NONSNOOP_EN_MASK=1 if ring is in non-cacheable memory, e.g., vram */
+ interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_REQ_NONSNOOP_EN, 0);
+ WREG32(mmINTERRUPT_CNTL, interrupt_cntl);
+
+ /* Ring Buffer base. [39:8] of 40-bit address of the beginning of the ring buffer*/
+ WREG32(mmIH_RB_BASE, adev->irq.ih.gpu_addr >> 8);
+
+ rb_bufsz = order_base_2(adev->irq.ih.ring_size / 4);
+ ih_rb_cntl = REG_SET_FIELD(0, IH_RB_CNTL, WPTR_OVERFLOW_ENABLE, 1);
+ 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, 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);
+
+ /* set the writeback address whether it's enabled or not */
+ wptr_off = adev->wb.gpu_addr + (adev->irq.ih.wptr_offs * 4);
+ WREG32(mmIH_RB_WPTR_ADDR_LO, lower_32_bits(wptr_off));
+ WREG32(mmIH_RB_WPTR_ADDR_HI, upper_32_bits(wptr_off) & 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);
+
+ pci_set_master(adev->pdev);
+
+ /* enable interrupts */
+ cz_ih_enable_interrupts(adev);
+
+ return ret;
+}
+
+/**
+ * cz_ih_irq_disable - disable interrupts
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Disable interrupts on the hw (VI).
+ */
+static void cz_ih_irq_disable(struct amdgpu_device *adev)
+{
+ cz_ih_disable_interrupts(adev);
+
+ /* Wait and acknowledge irq */
+ mdelay(1);
+}
+
+/**
+ * cz_ih_get_wptr - get the IH ring buffer wptr
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * 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 cz_ih_get_wptr(struct amdgpu_device *adev)
+{
+ u32 wptr, tmp;
+
+ wptr = le32_to_cpu(adev->wb.wb[adev->irq.ih.wptr_offs]);
+
+ if (REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW)) {
+ 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, adev->irq.ih.rptr, (wptr + 16) & adev->irq.ih.ptr_mask);
+ adev->irq.ih.rptr = (wptr + 16) & adev->irq.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);
+ }
+ return (wptr & adev->irq.ih.ptr_mask);
+}
+
+/**
+ * cz_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.
+ */
+static void cz_ih_decode_iv(struct amdgpu_device *adev,
+ struct amdgpu_iv_entry *entry)
+{
+ /* wptr/rptr are in bytes! */
+ u32 ring_index = adev->irq.ih.rptr >> 2;
+ uint32_t dw[4];
+
+ dw[0] = le32_to_cpu(adev->irq.ih.ring[ring_index + 0]);
+ dw[1] = le32_to_cpu(adev->irq.ih.ring[ring_index + 1]);
+ dw[2] = le32_to_cpu(adev->irq.ih.ring[ring_index + 2]);
+ dw[3] = le32_to_cpu(adev->irq.ih.ring[ring_index + 3]);
+
+ entry->src_id = dw[0] & 0xff;
+ entry->src_data = dw[1] & 0xfffffff;
+ entry->ring_id = dw[2] & 0xff;
+ entry->vm_id = (dw[2] >> 8) & 0xff;
+ entry->pas_id = (dw[2] >> 16) & 0xffff;
+
+ /* wptr/rptr are in bytes! */
+ adev->irq.ih.rptr += 16;
+}
+
+/**
+ * cz_ih_set_rptr - set the IH ring buffer rptr
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Set the IH ring buffer rptr.
+ */
+static void cz_ih_set_rptr(struct amdgpu_device *adev)
+{
+ WREG32(mmIH_RB_RPTR, adev->irq.ih.rptr);
+}
+
+static int cz_ih_early_init(void *handle)
+{
+ struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+ cz_ih_set_interrupt_funcs(adev);
+ return 0;
+}
+
+static int cz_ih_sw_init(void *handle)
+{
+ int r;
+ struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+ r = amdgpu_ih_ring_init(adev, 64 * 1024, false);
+ if (r)
+ return r;
+
+ r = amdgpu_irq_init(adev);
+
+ return r;
+}
+
+static int cz_ih_sw_fini(void *handle)
+{
+ struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+ amdgpu_irq_fini(adev);
+ amdgpu_ih_ring_fini(adev);
+
+ return 0;
+}
+
+static int cz_ih_hw_init(void *handle)
+{
+ int r;
+ struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+ r = cz_ih_irq_init(adev);
+ if (r)
+ return r;
+
+ return 0;
+}
+
+static int cz_ih_hw_fini(void *handle)
+{
+ struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+ cz_ih_irq_disable(adev);
+
+ return 0;
+}
+
+static int cz_ih_suspend(void *handle)
+{
+ struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+ return cz_ih_hw_fini(adev);
+}
+
+static int cz_ih_resume(void *handle)
+{
+ struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+ return cz_ih_hw_init(adev);
+}
+
+static bool cz_ih_is_idle(void *handle)
+{
+ struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+ u32 tmp = RREG32(mmSRBM_STATUS);
+
+ if (REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
+ return false;
+
+ return true;
+}
+
+static int cz_ih_wait_for_idle(void *handle)
+{
+ unsigned i;
+ u32 tmp;
+ struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+ for (i = 0; i < adev->usec_timeout; i++) {
+ /* read MC_STATUS */
+ tmp = RREG32(mmSRBM_STATUS);
+ if (!REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
+ return 0;
+ udelay(1);
+ }
+ return -ETIMEDOUT;
+}
+
+static void cz_ih_print_status(void *handle)
+{
+ struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+ dev_info(adev->dev, "CZ IH registers\n");
+ dev_info(adev->dev, " SRBM_STATUS=0x%08X\n",
+ RREG32(mmSRBM_STATUS));
+ dev_info(adev->dev, " SRBM_STATUS2=0x%08X\n",
+ RREG32(mmSRBM_STATUS2));
+ dev_info(adev->dev, " INTERRUPT_CNTL=0x%08X\n",
+ RREG32(mmINTERRUPT_CNTL));
+ dev_info(adev->dev, " INTERRUPT_CNTL2=0x%08X\n",
+ RREG32(mmINTERRUPT_CNTL2));
+ dev_info(adev->dev, " IH_CNTL=0x%08X\n",
+ RREG32(mmIH_CNTL));
+ dev_info(adev->dev, " IH_RB_CNTL=0x%08X\n",
+ RREG32(mmIH_RB_CNTL));
+ dev_info(adev->dev, " IH_RB_BASE=0x%08X\n",
+ RREG32(mmIH_RB_BASE));
+ dev_info(adev->dev, " IH_RB_WPTR_ADDR_LO=0x%08X\n",
+ RREG32(mmIH_RB_WPTR_ADDR_LO));
+ dev_info(adev->dev, " IH_RB_WPTR_ADDR_HI=0x%08X\n",
+ RREG32(mmIH_RB_WPTR_ADDR_HI));
+ dev_info(adev->dev, " IH_RB_RPTR=0x%08X\n",
+ RREG32(mmIH_RB_RPTR));
+ dev_info(adev->dev, " IH_RB_WPTR=0x%08X\n",
+ RREG32(mmIH_RB_WPTR));
+}
+
+static int cz_ih_soft_reset(void *handle)
+{
+ u32 srbm_soft_reset = 0;
+ struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+ u32 tmp = RREG32(mmSRBM_STATUS);
+
+ if (tmp & SRBM_STATUS__IH_BUSY_MASK)
+ srbm_soft_reset = REG_SET_FIELD(srbm_soft_reset, SRBM_SOFT_RESET,
+ SOFT_RESET_IH, 1);
+
+ if (srbm_soft_reset) {
+ cz_ih_print_status((void *)adev);
+
+ tmp = RREG32(mmSRBM_SOFT_RESET);
+ tmp |= srbm_soft_reset;
+ dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp);
+ WREG32(mmSRBM_SOFT_RESET, tmp);
+ tmp = RREG32(mmSRBM_SOFT_RESET);
+
+ udelay(50);
+
+ tmp &= ~srbm_soft_reset;
+ WREG32(mmSRBM_SOFT_RESET, tmp);
+ tmp = RREG32(mmSRBM_SOFT_RESET);
+
+ /* Wait a little for things to settle down */
+ udelay(50);
+
+ cz_ih_print_status((void *)adev);
+ }
+
+ return 0;
+}
+
+static int cz_ih_set_clockgating_state(void *handle,
+ enum amd_clockgating_state state)
+{
+ // TODO
+ return 0;
+}
+
+static int cz_ih_set_powergating_state(void *handle,
+ enum amd_powergating_state state)
+{
+ // TODO
+ return 0;
+}
+
+const struct amd_ip_funcs cz_ih_ip_funcs = {
+ .early_init = cz_ih_early_init,
+ .late_init = NULL,
+ .sw_init = cz_ih_sw_init,
+ .sw_fini = cz_ih_sw_fini,
+ .hw_init = cz_ih_hw_init,
+ .hw_fini = cz_ih_hw_fini,
+ .suspend = cz_ih_suspend,
+ .resume = cz_ih_resume,
+ .is_idle = cz_ih_is_idle,
+ .wait_for_idle = cz_ih_wait_for_idle,
+ .soft_reset = cz_ih_soft_reset,
+ .print_status = cz_ih_print_status,
+ .set_clockgating_state = cz_ih_set_clockgating_state,
+ .set_powergating_state = cz_ih_set_powergating_state,
+};
+
+static const struct amdgpu_ih_funcs cz_ih_funcs = {
+ .get_wptr = cz_ih_get_wptr,
+ .decode_iv = cz_ih_decode_iv,
+ .set_rptr = cz_ih_set_rptr
+};
+
+static void cz_ih_set_interrupt_funcs(struct amdgpu_device *adev)
+{
+ if (adev->irq.ih_funcs == NULL)
+ adev->irq.ih_funcs = &cz_ih_funcs;
+}
+
Code Review / kvmfornfv.git / blobdiff