// SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
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/*
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*
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* (C) COPYRIGHT 2019-2021 ARM Limited. All rights reserved.
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*
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* This program is free software and is provided to you under the terms of the
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* GNU General Public License version 2 as published by the Free Software
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* Foundation, and any use by you of this program is subject to the terms
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* of such GNU license.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you can access it online at
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* http://www.gnu.org/licenses/gpl-2.0.html.
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*
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*/
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/*
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* Implementation of the dummy job execution workaround for the GPU hang issue.
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*/
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#include <mali_kbase.h>
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#include <device/mali_kbase_device.h>
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#include <mali_kbase_dummy_job_wa.h>
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#include <linux/firmware.h>
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#include <linux/delay.h>
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#define DUMMY_JOB_WA_BINARY_NAME "valhall-1691526.wa"
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struct wa_header {
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u16 signature;
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u16 version;
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u32 info_offset;
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} __packed;
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struct wa_v2_info {
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u64 jc;
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u32 js;
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u32 blob_offset;
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u64 flags;
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} __packed;
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struct wa_blob {
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u64 base;
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u32 size;
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u32 map_flags;
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u32 payload_offset;
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u32 blob_offset;
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} __packed;
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static bool in_range(const u8 *base, const u8 *end, off_t off, size_t sz)
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{
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return !(end - base - off < sz);
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}
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static u32 wait_any(struct kbase_device *kbdev, off_t offset, u32 bits)
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{
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int loop;
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const int timeout = 100;
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u32 val;
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for (loop = 0; loop < timeout; loop++) {
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val = kbase_reg_read(kbdev, offset);
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if (val & bits)
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break;
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udelay(10);
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}
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if (loop == timeout) {
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dev_err(kbdev->dev,
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"Timeout reading register 0x%lx, bits 0x%lx, last read was 0x%lx\n",
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(unsigned long)offset, (unsigned long)bits,
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(unsigned long)val);
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}
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return (val & bits);
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}
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static int wait(struct kbase_device *kbdev, off_t offset, u32 bits, bool set)
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{
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int loop;
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const int timeout = 100;
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u32 val;
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u32 target = 0;
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if (set)
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target = bits;
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for (loop = 0; loop < timeout; loop++) {
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val = kbase_reg_read(kbdev, (offset));
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if ((val & bits) == target)
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break;
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udelay(10);
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}
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if (loop == timeout) {
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dev_err(kbdev->dev,
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"Timeout reading register 0x%lx, bits 0x%lx, last read was 0x%lx\n",
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(unsigned long)offset, (unsigned long)bits,
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(unsigned long)val);
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return -ETIMEDOUT;
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}
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return 0;
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}
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static inline int run_job(struct kbase_device *kbdev, int as, int slot,
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u64 cores, u64 jc)
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{
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u32 done;
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/* setup job */
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kbase_reg_write(kbdev, JOB_SLOT_REG(slot, JS_HEAD_NEXT_LO),
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jc & U32_MAX);
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kbase_reg_write(kbdev, JOB_SLOT_REG(slot, JS_HEAD_NEXT_HI),
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jc >> 32);
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kbase_reg_write(kbdev, JOB_SLOT_REG(slot, JS_AFFINITY_NEXT_LO),
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cores & U32_MAX);
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kbase_reg_write(kbdev, JOB_SLOT_REG(slot, JS_AFFINITY_NEXT_HI),
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cores >> 32);
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kbase_reg_write(kbdev, JOB_SLOT_REG(slot, JS_CONFIG_NEXT),
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JS_CONFIG_DISABLE_DESCRIPTOR_WR_BK | as);
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/* go */
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kbase_reg_write(kbdev, JOB_SLOT_REG(slot, JS_COMMAND_NEXT),
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JS_COMMAND_START);
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/* wait for the slot to finish (done, error) */
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done = wait_any(kbdev, JOB_CONTROL_REG(JOB_IRQ_RAWSTAT),
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(1ul << (16+slot)) | (1ul << slot));
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kbase_reg_write(kbdev, JOB_CONTROL_REG(JOB_IRQ_CLEAR), done);
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if (done != (1ul << slot)) {
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dev_err(kbdev->dev,
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"Failed to run WA job on slot %d cores 0x%llx: done 0x%lx\n",
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slot, (unsigned long long)cores,
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(unsigned long)done);
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dev_err(kbdev->dev, "JS_STATUS on failure: 0x%x\n",
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kbase_reg_read(kbdev, JOB_SLOT_REG(slot, JS_STATUS)));
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return -EFAULT;
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} else {
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return 0;
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}
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}
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/* To be called after power up & MMU init, but before everything else */
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int kbase_dummy_job_wa_execute(struct kbase_device *kbdev, u64 cores)
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{
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int as;
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int slot;
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u64 jc;
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int failed = 0;
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int runs = 0;
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u32 old_gpu_mask;
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u32 old_job_mask;
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if (!kbdev)
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return -EFAULT;
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if (!kbdev->dummy_job_wa.ctx)
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return -EFAULT;
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as = kbdev->dummy_job_wa.ctx->as_nr;
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slot = kbdev->dummy_job_wa.slot;
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jc = kbdev->dummy_job_wa.jc;
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/* mask off all but MMU IRQs */
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old_gpu_mask = kbase_reg_read(kbdev, GPU_CONTROL_REG(GPU_IRQ_MASK));
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old_job_mask = kbase_reg_read(kbdev, JOB_CONTROL_REG(JOB_IRQ_MASK));
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kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_IRQ_MASK), 0);
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kbase_reg_write(kbdev, JOB_CONTROL_REG(JOB_IRQ_MASK), 0);
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/* power up requested cores */
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kbase_reg_write(kbdev, SHADER_PWRON_LO, (cores & U32_MAX));
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kbase_reg_write(kbdev, SHADER_PWRON_HI, (cores >> 32));
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if (kbdev->dummy_job_wa.flags & KBASE_DUMMY_JOB_WA_FLAG_WAIT_POWERUP) {
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/* wait for power-ups */
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wait(kbdev, SHADER_READY_LO, (cores & U32_MAX), true);
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if (cores >> 32)
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wait(kbdev, SHADER_READY_HI, (cores >> 32), true);
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}
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if (kbdev->dummy_job_wa.flags & KBASE_DUMMY_JOB_WA_FLAG_SERIALIZE) {
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int i;
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/* do for each requested core */
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for (i = 0; i < sizeof(cores) * 8; i++) {
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u64 affinity;
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affinity = 1ull << i;
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if (!(cores & affinity))
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continue;
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if (run_job(kbdev, as, slot, affinity, jc))
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failed++;
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runs++;
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}
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} else {
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if (run_job(kbdev, as, slot, cores, jc))
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failed++;
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runs++;
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}
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if (kbdev->dummy_job_wa.flags &
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KBASE_DUMMY_JOB_WA_FLAG_LOGICAL_SHADER_POWER) {
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/* power off shader cores (to reduce any dynamic leakage) */
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kbase_reg_write(kbdev, SHADER_PWROFF_LO, (cores & U32_MAX));
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kbase_reg_write(kbdev, SHADER_PWROFF_HI, (cores >> 32));
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/* wait for power off complete */
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wait(kbdev, SHADER_READY_LO, (cores & U32_MAX), false);
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wait(kbdev, SHADER_PWRTRANS_LO, (cores & U32_MAX), false);
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if (cores >> 32) {
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wait(kbdev, SHADER_READY_HI, (cores >> 32), false);
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wait(kbdev, SHADER_PWRTRANS_HI, (cores >> 32), false);
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}
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kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_IRQ_CLEAR), U32_MAX);
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}
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/* restore IRQ masks */
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kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_IRQ_MASK), old_gpu_mask);
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kbase_reg_write(kbdev, JOB_CONTROL_REG(JOB_IRQ_MASK), old_job_mask);
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if (failed)
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dev_err(kbdev->dev,
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"WA complete with %d failures out of %d runs\n", failed,
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runs);
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return failed ? -EFAULT : 0;
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}
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static ssize_t dummy_job_wa_info_show(struct device * const dev,
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struct device_attribute * const attr, char * const buf)
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{
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struct kbase_device *const kbdev = dev_get_drvdata(dev);
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int err;
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if (!kbdev || !kbdev->dummy_job_wa.ctx)
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return -ENODEV;
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err = scnprintf(buf, PAGE_SIZE, "slot %u flags %llx\n",
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kbdev->dummy_job_wa.slot, kbdev->dummy_job_wa.flags);
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return err;
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}
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static DEVICE_ATTR_RO(dummy_job_wa_info);
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static bool wa_blob_load_needed(struct kbase_device *kbdev)
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{
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if (of_machine_is_compatible("arm,juno"))
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return false;
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if (kbase_hw_has_issue(kbdev, BASE_HW_ISSUE_TTRX_3485))
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return true;
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return false;
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}
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int kbase_dummy_job_wa_load(struct kbase_device *kbdev)
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{
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const struct firmware *firmware;
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static const char wa_name[] = DUMMY_JOB_WA_BINARY_NAME;
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const u32 signature = 0x4157;
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const u32 version = 2;
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const u8 *fw_end;
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const u8 *fw;
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const struct wa_header *header;
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const struct wa_v2_info *v2_info;
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u32 blob_offset;
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int err;
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struct kbase_context *kctx;
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/* Calls to this function are inherently asynchronous, with respect to
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* MMU operations.
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*/
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const enum kbase_caller_mmu_sync_info mmu_sync_info = CALLER_MMU_ASYNC;
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lockdep_assert_held(&kbdev->fw_load_lock);
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if (!wa_blob_load_needed(kbdev))
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return 0;
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/* load the wa */
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err = request_firmware(&firmware, wa_name, kbdev->dev);
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if (err) {
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dev_err(kbdev->dev, "WA blob missing. Please refer to the Arm Mali DDK Valhall Release Notes, "
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"Part number DC-06002 or contact support-mali@arm.com - driver probe will be failed");
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return -ENODEV;
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}
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kctx = kbase_create_context(kbdev, true,
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BASE_CONTEXT_CREATE_FLAG_NONE, 0,
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NULL);
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if (!kctx) {
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dev_err(kbdev->dev, "Failed to create WA context\n");
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goto no_ctx;
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}
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fw = firmware->data;
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fw_end = fw + firmware->size;
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dev_dbg(kbdev->dev, "Loaded firmware of size %zu bytes\n",
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firmware->size);
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if (!in_range(fw, fw_end, 0, sizeof(*header))) {
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dev_err(kbdev->dev, "WA too small\n");
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goto bad_fw;
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}
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header = (const struct wa_header *)(fw + 0);
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if (header->signature != signature) {
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dev_err(kbdev->dev, "WA signature failure: 0x%lx\n",
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(unsigned long)header->signature);
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goto bad_fw;
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}
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if (header->version != version) {
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dev_err(kbdev->dev, "WA version 0x%lx not supported\n",
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(unsigned long)header->version);
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goto bad_fw;
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}
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if (!in_range(fw, fw_end, header->info_offset, sizeof(*v2_info))) {
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dev_err(kbdev->dev, "WA info offset out of bounds\n");
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goto bad_fw;
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}
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v2_info = (const struct wa_v2_info *)(fw + header->info_offset);
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if (v2_info->flags & ~KBASE_DUMMY_JOB_WA_FLAGS) {
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dev_err(kbdev->dev, "Unsupported WA flag(s): 0x%llx\n",
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(unsigned long long)v2_info->flags);
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goto bad_fw;
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}
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kbdev->dummy_job_wa.slot = v2_info->js;
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kbdev->dummy_job_wa.jc = v2_info->jc;
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kbdev->dummy_job_wa.flags = v2_info->flags;
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blob_offset = v2_info->blob_offset;
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while (blob_offset) {
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const struct wa_blob *blob;
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size_t nr_pages;
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u64 flags;
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u64 gpu_va;
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struct kbase_va_region *va_region;
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if (!in_range(fw, fw_end, blob_offset, sizeof(*blob))) {
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dev_err(kbdev->dev, "Blob offset out-of-range: 0x%lx\n",
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(unsigned long)blob_offset);
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goto bad_fw;
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}
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blob = (const struct wa_blob *)(fw + blob_offset);
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if (!in_range(fw, fw_end, blob->payload_offset, blob->size)) {
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dev_err(kbdev->dev, "Payload out-of-bounds\n");
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goto bad_fw;
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}
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gpu_va = blob->base;
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if (PAGE_ALIGN(gpu_va) != gpu_va) {
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dev_err(kbdev->dev, "blob not page aligned\n");
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goto bad_fw;
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}
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nr_pages = PFN_UP(blob->size);
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flags = blob->map_flags | BASE_MEM_FLAG_MAP_FIXED;
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va_region = kbase_mem_alloc(kctx, nr_pages, nr_pages, 0, &flags,
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&gpu_va, mmu_sync_info);
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if (!va_region) {
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dev_err(kbdev->dev, "Failed to allocate for blob\n");
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} else {
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struct kbase_vmap_struct vmap = { 0 };
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const u8 *payload;
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void *dst;
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/* copy the payload, */
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payload = fw + blob->payload_offset;
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dst = kbase_vmap(kctx,
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va_region->start_pfn << PAGE_SHIFT,
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nr_pages << PAGE_SHIFT, &vmap);
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if (dst) {
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memcpy(dst, payload, blob->size);
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kbase_vunmap(kctx, &vmap);
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} else {
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dev_err(kbdev->dev,
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"Failed to copy payload\n");
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}
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}
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blob_offset = blob->blob_offset; /* follow chain */
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}
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release_firmware(firmware);
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kbasep_js_schedule_privileged_ctx(kbdev, kctx);
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kbdev->dummy_job_wa.ctx = kctx;
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err = sysfs_create_file(&kbdev->dev->kobj,
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&dev_attr_dummy_job_wa_info.attr);
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if (err)
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dev_err(kbdev->dev, "SysFS file creation for dummy job wa failed\n");
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return 0;
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bad_fw:
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kbase_destroy_context(kctx);
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no_ctx:
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release_firmware(firmware);
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return -EFAULT;
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}
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void kbase_dummy_job_wa_cleanup(struct kbase_device *kbdev)
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{
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struct kbase_context *wa_ctx;
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/* return if the dummy job has not been loaded */
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if (kbdev->dummy_job_wa_loaded == false)
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return;
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/* Can be safely called even if the file wasn't created on probe */
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sysfs_remove_file(&kbdev->dev->kobj, &dev_attr_dummy_job_wa_info.attr);
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wa_ctx = READ_ONCE(kbdev->dummy_job_wa.ctx);
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WRITE_ONCE(kbdev->dummy_job_wa.ctx, NULL);
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/* make this write visible before we tear down the ctx */
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smp_mb();
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if (wa_ctx) {
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kbasep_js_release_privileged_ctx(kbdev, wa_ctx);
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kbase_destroy_context(wa_ctx);
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}
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}
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