[PATCH v3 04/14] drm/panthor: Add the GPU logical block
Boris Brezillon
boris.brezillon at collabora.com
Mon Dec 4 17:32:57 UTC 2023
Handles everything that's not related to the FW, the MMU or the
scheduler. This is the block dealing with the GPU property retrieval,
the GPU block power on/off logic, and some global operations, like
global cache flushing.
v3:
- Add acks for the MIT/GPL2 relicensing
- Use macros to extract GPU ID info
- Make sure we reset clear pending_reqs bits when wait_event_timeout()
times out but the corresponding bit is cleared in GPU_INT_RAWSTAT
(can happen if the IRQ is masked or HW takes to long to call the IRQ
handler)
- GPU_MODEL now takes separate arch and product majors to be more
readable.
- Drop GPU_IRQ_MCU_STATUS_CHANGED from interrupt mask.
- Handle GPU_IRQ_PROTM_FAULT correctly (don't output registers that are
not updated for protected interrupts).
- Minor code tidy ups
Cc: Alexey Sheplyakov <asheplyakov at basealt.ru> # MIT+GPL2 relicensing
Signed-off-by: Boris Brezillon <boris.brezillon at collabora.com>
Signed-off-by: Steven Price <steven.price at arm.com>
Acked-by: Steven Price <steven.price at arm.com> # MIT+GPL2 relicensing,Arm
Acked-by: Grant Likely <grant.likely at linaro.org> # MIT+GPL2 relicensing,Linaro
Acked-by: Boris Brezillon <boris.brezillon at collabora.com> # MIT+GPL2 relicensing,Collabora
---
drivers/gpu/drm/panthor/panthor_gpu.c | 481 ++++++++++++++++++++++++++
drivers/gpu/drm/panthor/panthor_gpu.h | 52 +++
2 files changed, 533 insertions(+)
create mode 100644 drivers/gpu/drm/panthor/panthor_gpu.c
create mode 100644 drivers/gpu/drm/panthor/panthor_gpu.h
diff --git a/drivers/gpu/drm/panthor/panthor_gpu.c b/drivers/gpu/drm/panthor/panthor_gpu.c
new file mode 100644
index 000000000000..db3df550f320
--- /dev/null
+++ b/drivers/gpu/drm/panthor/panthor_gpu.c
@@ -0,0 +1,481 @@
+// SPDX-License-Identifier: GPL-2.0 or MIT
+/* Copyright 2018 Marty E. Plummer <hanetzer at startmail.com> */
+/* Copyright 2019 Linaro, Ltd., Rob Herring <robh at kernel.org> */
+/* Copyright 2019 Collabora ltd. */
+
+#include <linux/bitfield.h>
+#include <linux/bitmap.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include <drm/drm_drv.h>
+#include <drm/drm_managed.h>
+
+#include "panthor_device.h"
+#include "panthor_gpu.h"
+#include "panthor_regs.h"
+
+/**
+ * struct panthor_gpu - GPU block management data.
+ */
+struct panthor_gpu {
+ /** @irq: GPU irq. */
+ struct panthor_irq irq;
+
+ /** @reqs_lock: Lock protecting access to pending_reqs. */
+ spinlock_t reqs_lock;
+
+ /** @pending_reqs: Pending GPU requests. */
+ u32 pending_reqs;
+
+ /** @reqs_acked: GPU request wait queue. */
+ wait_queue_head_t reqs_acked;
+};
+
+/**
+ * struct panthor_model - GPU model description
+ */
+struct panthor_model {
+ /** @name: Model name. */
+ const char *name;
+
+ /** @arch_major: Major version number of architecture. */
+ u8 arch_major;
+
+ /** @product_major: Major version number of product. */
+ u8 product_major;
+};
+
+/**
+ * GPU_MODEL() - Define a GPU model. A GPU product can be uniquely identified
+ * by a combination of the major architecture version and the major product
+ * version.
+ * @name: Name for the GPU model.
+ * @_arch_major: Architecture major.
+ * @_product_major: Product major.
+ */
+#define GPU_MODEL(_name, _arch_major, _product_major) \
+{\
+ .name = __stringify(_name), \
+ .arch_major = _arch_major, \
+ .product_major = _product_major, \
+}
+
+static const struct panthor_model gpu_models[] = {
+ GPU_MODEL(g610, 10, 7),
+ {},
+};
+
+#define GPU_INTERRUPTS_MASK \
+ (GPU_IRQ_FAULT | \
+ GPU_IRQ_PROTM_FAULT | \
+ GPU_IRQ_RESET_COMPLETED | \
+ GPU_IRQ_CLEAN_CACHES_COMPLETED)
+
+static void panthor_gpu_init_info(struct panthor_device *ptdev)
+{
+ const struct panthor_model *model;
+ u32 arch_major, product_major;
+ u32 major, minor, status;
+ unsigned int i;
+
+ ptdev->gpu_info.gpu_id = gpu_read(ptdev, GPU_ID);
+ ptdev->gpu_info.csf_id = gpu_read(ptdev, GPU_CSF_ID);
+ ptdev->gpu_info.gpu_rev = gpu_read(ptdev, GPU_REVID);
+ ptdev->gpu_info.l2_features = gpu_read(ptdev, GPU_L2_FEATURES);
+ ptdev->gpu_info.tiler_features = gpu_read(ptdev, GPU_TILER_FEATURES);
+ ptdev->gpu_info.mem_features = gpu_read(ptdev, GPU_MEM_FEATURES);
+ ptdev->gpu_info.mmu_features = gpu_read(ptdev, GPU_MMU_FEATURES);
+ ptdev->gpu_info.thread_features = gpu_read(ptdev, GPU_THREAD_FEATURES);
+ ptdev->gpu_info.max_threads = gpu_read(ptdev, GPU_THREAD_MAX_THREADS);
+ ptdev->gpu_info.thread_max_workgroup_size = gpu_read(ptdev, GPU_THREAD_MAX_WORKGROUP_SIZE);
+ ptdev->gpu_info.thread_max_barrier_size = gpu_read(ptdev, GPU_THREAD_MAX_BARRIER_SIZE);
+ ptdev->gpu_info.coherency_features = gpu_read(ptdev, GPU_COHERENCY_FEATURES);
+ for (i = 0; i < 4; i++)
+ ptdev->gpu_info.texture_features[i] = gpu_read(ptdev, GPU_TEXTURE_FEATURES(i));
+
+ ptdev->gpu_info.as_present = gpu_read(ptdev, GPU_AS_PRESENT);
+
+ ptdev->gpu_info.shader_present = gpu_read(ptdev, GPU_SHADER_PRESENT_LO);
+ ptdev->gpu_info.shader_present |= (u64)gpu_read(ptdev, GPU_SHADER_PRESENT_HI) << 32;
+
+ ptdev->gpu_info.tiler_present = gpu_read(ptdev, GPU_TILER_PRESENT_LO);
+ ptdev->gpu_info.tiler_present |= (u64)gpu_read(ptdev, GPU_TILER_PRESENT_HI) << 32;
+
+ ptdev->gpu_info.l2_present = gpu_read(ptdev, GPU_L2_PRESENT_LO);
+ ptdev->gpu_info.l2_present |= (u64)gpu_read(ptdev, GPU_L2_PRESENT_HI) << 32;
+
+ arch_major = GPU_ARCH_MAJOR(ptdev->gpu_info.gpu_id);
+ product_major = GPU_PROD_MAJOR(ptdev->gpu_info.gpu_id);
+ major = GPU_VER_MAJOR(ptdev->gpu_info.gpu_id);
+ minor = GPU_VER_MINOR(ptdev->gpu_info.gpu_id);
+ status = GPU_VER_STATUS(ptdev->gpu_info.gpu_id);
+
+ for (model = gpu_models; model->name; model++) {
+ if (model->arch_major == arch_major &&
+ model->product_major == product_major)
+ break;
+ }
+
+ drm_info(&ptdev->base,
+ "mali-%s id 0x%x major 0x%x minor 0x%x status 0x%x",
+ model->name ?: "unknown", ptdev->gpu_info.gpu_id >> 16,
+ major, minor, status);
+
+ drm_info(&ptdev->base,
+ "Features: L2:%#x Tiler:%#x Mem:%#x MMU:%#x AS:%#x",
+ ptdev->gpu_info.l2_features,
+ ptdev->gpu_info.tiler_features,
+ ptdev->gpu_info.mem_features,
+ ptdev->gpu_info.mmu_features,
+ ptdev->gpu_info.as_present);
+
+ drm_info(&ptdev->base,
+ "shader_present=0x%0llx l2_present=0x%0llx tiler_present=0x%0llx",
+ ptdev->gpu_info.shader_present, ptdev->gpu_info.l2_present,
+ ptdev->gpu_info.tiler_present);
+}
+
+static void panthor_gpu_irq_handler(struct panthor_device *ptdev, u32 status)
+{
+ if (status & GPU_IRQ_FAULT) {
+ u32 fault_status = gpu_read(ptdev, GPU_FAULT_STATUS);
+ u64 address = ((u64)gpu_read(ptdev, GPU_FAULT_ADDR_HI) << 32) |
+ gpu_read(ptdev, GPU_FAULT_ADDR_LO);
+
+ drm_warn(&ptdev->base, "GPU Fault 0x%08x (%s) at 0x%016llx\n",
+ fault_status, panthor_exception_name(ptdev, fault_status & 0xFF),
+ address);
+ }
+ if (status & GPU_IRQ_PROTM_FAULT)
+ drm_warn(&ptdev->base, "GPU Fault in protected mode\n");
+
+ spin_lock(&ptdev->gpu->reqs_lock);
+ if (status & ptdev->gpu->pending_reqs) {
+ ptdev->gpu->pending_reqs &= ~status;
+ wake_up_all(&ptdev->gpu->reqs_acked);
+ }
+ spin_unlock(&ptdev->gpu->reqs_lock);
+}
+PANTHOR_IRQ_HANDLER(gpu, GPU, panthor_gpu_irq_handler);
+
+/**
+ * panthor_gpu_unplug() - Called when the GPU is unplugged.
+ * @ptdev: Device to unplug.
+ */
+void panthor_gpu_unplug(struct panthor_device *ptdev)
+{
+ unsigned long flags;
+
+ /* Make sure the IRQ handler is not running after that point. */
+ panthor_gpu_irq_suspend(&ptdev->gpu->irq);
+
+ /* Wake-up all waiters. */
+ spin_lock_irqsave(&ptdev->gpu->reqs_lock, flags);
+ ptdev->gpu->pending_reqs = 0;
+ wake_up_all(&ptdev->gpu->reqs_acked);
+ spin_unlock_irqrestore(&ptdev->gpu->reqs_lock, flags);
+}
+
+/**
+ * panthor_gpu_init() - Initialize the GPU block
+ * @ptdev: Device.
+ *
+ * Return: 0 on success, a negative error code otherwise.
+ */
+int panthor_gpu_init(struct panthor_device *ptdev)
+{
+ struct panthor_gpu *gpu;
+ u32 pa_bits;
+ int ret, irq;
+
+ gpu = drmm_kzalloc(&ptdev->base, sizeof(*gpu), GFP_KERNEL);
+ if (!gpu)
+ return -ENOMEM;
+
+ spin_lock_init(&gpu->reqs_lock);
+ init_waitqueue_head(&gpu->reqs_acked);
+ ptdev->gpu = gpu;
+ panthor_gpu_init_info(ptdev);
+
+ dma_set_max_seg_size(ptdev->base.dev, UINT_MAX);
+ pa_bits = GPU_MMU_FEATURES_PA_BITS(ptdev->gpu_info.mmu_features);
+ ret = dma_set_mask_and_coherent(ptdev->base.dev, DMA_BIT_MASK(pa_bits));
+ if (ret)
+ return ret;
+
+ irq = platform_get_irq_byname(to_platform_device(ptdev->base.dev), "gpu");
+ if (irq <= 0)
+ return ret;
+
+ ret = panthor_request_gpu_irq(ptdev, &ptdev->gpu->irq, irq, GPU_INTERRUPTS_MASK);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+/**
+ * panthor_gpu_block_power_off() - Power-off a specific block of the GPU
+ * @ptdev: Device.
+ * @blk_name: Block name.
+ * @pwroff_reg: Power-off register for this block.
+ * @pwrtrans_reg: Power transition register for this block.
+ * @mask: Sub-elements to power-off.
+ * @timeout_us: Timeout in microseconds.
+ *
+ * Return: 0 on success, a negative error code otherwise.
+ */
+int panthor_gpu_block_power_off(struct panthor_device *ptdev,
+ const char *blk_name,
+ u32 pwroff_reg, u32 pwrtrans_reg,
+ u64 mask, u32 timeout_us)
+{
+ u32 val, i;
+ int ret;
+
+ for (i = 0; i < 2; i++) {
+ u32 mask32 = mask >> (i * 32);
+
+ if (!mask32)
+ continue;
+
+ ret = readl_relaxed_poll_timeout(ptdev->iomem + pwrtrans_reg + (i * 4),
+ val, !(mask32 & val),
+ 100, timeout_us);
+ if (ret) {
+ drm_err(&ptdev->base, "timeout waiting on %s:%llx power transition",
+ blk_name, mask);
+ return ret;
+ }
+ }
+
+ if (mask & GENMASK(31, 0))
+ gpu_write(ptdev, pwroff_reg, mask);
+
+ if (mask >> 32)
+ gpu_write(ptdev, pwroff_reg + 4, mask >> 32);
+
+ for (i = 0; i < 2; i++) {
+ u32 mask32 = mask >> (i * 32);
+
+ if (!mask32)
+ continue;
+
+ ret = readl_relaxed_poll_timeout(ptdev->iomem + pwrtrans_reg + (i * 4),
+ val, !(mask & val),
+ 100, timeout_us);
+ if (ret) {
+ drm_err(&ptdev->base, "timeout waiting on %s:%llx power transition",
+ blk_name, mask);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * panthor_gpu_block_power_on() - Power-on a specific block of the GPU
+ * @ptdev: Device.
+ * @blk_name: Block name.
+ * @pwron_reg: Power-on register for this block.
+ * @pwrtrans_reg: Power transition register for this block.
+ * @rdy_reg: Power transition ready register.
+ * @mask: Sub-elements to power-on.
+ * @timeout_us: Timeout in microseconds.
+ *
+ * Return: 0 on success, a negative error code otherwise.
+ */
+int panthor_gpu_block_power_on(struct panthor_device *ptdev,
+ const char *blk_name,
+ u32 pwron_reg, u32 pwrtrans_reg,
+ u32 rdy_reg, u64 mask, u32 timeout_us)
+{
+ u32 val, i;
+ int ret;
+
+ for (i = 0; i < 2; i++) {
+ u32 mask32 = mask >> (i * 32);
+
+ if (!mask32)
+ continue;
+
+ ret = readl_relaxed_poll_timeout(ptdev->iomem + pwrtrans_reg + (i * 4),
+ val, !(mask32 & val),
+ 100, timeout_us);
+ if (ret) {
+ drm_err(&ptdev->base, "timeout waiting on %s:%llx power transition",
+ blk_name, mask);
+ return ret;
+ }
+ }
+
+ if (mask & GENMASK(31, 0))
+ gpu_write(ptdev, pwron_reg, mask);
+
+ if (mask >> 32)
+ gpu_write(ptdev, pwron_reg + 4, mask >> 32);
+
+ for (i = 0; i < 2; i++) {
+ u32 mask32 = mask >> (i * 32);
+
+ if (!mask32)
+ continue;
+
+ ret = readl_relaxed_poll_timeout(ptdev->iomem + rdy_reg + (i * 4),
+ val, (mask32 & val) == mask32,
+ 100, timeout_us);
+ if (ret) {
+ drm_err(&ptdev->base, "timeout waiting on %s:%llx readyness",
+ blk_name, mask);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * panthor_gpu_l2_power_on() - Power-on the L2-cache
+ * @ptdev: Device.
+ *
+ * Return: 0 on success, a negative error code otherwise.
+ */
+int panthor_gpu_l2_power_on(struct panthor_device *ptdev)
+{
+ if (ptdev->gpu_info.l2_present != 1) {
+ /*
+ * Only support one core group now.
+ * ~(l2_present - 1) unsets all bits in l2_present except
+ * the bottom bit. (l2_present - 2) has all the bits in
+ * the first core group set. AND them together to generate
+ * a mask of cores in the first core group.
+ */
+ u64 core_mask = ~(ptdev->gpu_info.l2_present - 1) &
+ (ptdev->gpu_info.l2_present - 2);
+ drm_info_once(&ptdev->base, "using only 1st core group (%lu cores from %lu)\n",
+ hweight64(core_mask),
+ hweight64(ptdev->gpu_info.shader_present));
+ }
+
+ return panthor_gpu_power_on(ptdev, L2, 1, 20000);
+}
+
+/**
+ * panthor_gpu_flush_caches() - Flush caches
+ * @ptdev: Device.
+ * @l2: L2 flush type.
+ * @lsc: LSC flush type.
+ * @other: Other flush type.
+ *
+ * Return: 0 on success, a negative error code otherwise.
+ */
+int panthor_gpu_flush_caches(struct panthor_device *ptdev,
+ u32 l2, u32 lsc, u32 other)
+{
+ bool timedout = false;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ptdev->gpu->reqs_lock, flags);
+ if (!drm_WARN_ON(&ptdev->base,
+ ptdev->gpu->pending_reqs & GPU_IRQ_CLEAN_CACHES_COMPLETED)) {
+ ptdev->gpu->pending_reqs |= GPU_IRQ_CLEAN_CACHES_COMPLETED;
+ gpu_write(ptdev, GPU_CMD, GPU_FLUSH_CACHES(l2, lsc, other));
+ }
+ spin_unlock_irqrestore(&ptdev->gpu->reqs_lock, flags);
+
+ if (!wait_event_timeout(ptdev->gpu->reqs_acked,
+ !(ptdev->gpu->pending_reqs & GPU_IRQ_CLEAN_CACHES_COMPLETED),
+ msecs_to_jiffies(100))) {
+ spin_lock_irqsave(&ptdev->gpu->reqs_lock, flags);
+ if ((ptdev->gpu->pending_reqs & GPU_IRQ_CLEAN_CACHES_COMPLETED) != 0 &&
+ !(gpu_read(ptdev, GPU_INT_RAWSTAT) & GPU_IRQ_CLEAN_CACHES_COMPLETED))
+ timedout = true;
+ else
+ ptdev->gpu->pending_reqs &= ~GPU_IRQ_CLEAN_CACHES_COMPLETED;
+ spin_unlock_irqrestore(&ptdev->gpu->reqs_lock, flags);
+ }
+
+ if (timedout) {
+ drm_err(&ptdev->base, "Flush caches timeout");
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+/**
+ * panthor_gpu_soft_reset() - Issue a soft-reset
+ * @ptdev: Device.
+ *
+ * Return: 0 on success, a negative error code otherwise.
+ */
+int panthor_gpu_soft_reset(struct panthor_device *ptdev)
+{
+ bool timedout = false;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ptdev->gpu->reqs_lock, flags);
+ if (!drm_WARN_ON(&ptdev->base,
+ ptdev->gpu->pending_reqs & GPU_IRQ_RESET_COMPLETED)) {
+ ptdev->gpu->pending_reqs |= GPU_IRQ_RESET_COMPLETED;
+ gpu_write(ptdev, GPU_INT_CLEAR, GPU_IRQ_RESET_COMPLETED);
+ gpu_write(ptdev, GPU_CMD, GPU_SOFT_RESET);
+ }
+ spin_unlock_irqrestore(&ptdev->gpu->reqs_lock, flags);
+
+ if (!wait_event_timeout(ptdev->gpu->reqs_acked,
+ !(ptdev->gpu->pending_reqs & GPU_IRQ_RESET_COMPLETED),
+ msecs_to_jiffies(100))) {
+ spin_lock_irqsave(&ptdev->gpu->reqs_lock, flags);
+ if ((ptdev->gpu->pending_reqs & GPU_IRQ_RESET_COMPLETED) != 0 &&
+ !(gpu_read(ptdev, GPU_INT_RAWSTAT) & GPU_IRQ_RESET_COMPLETED))
+ timedout = true;
+ else
+ ptdev->gpu->pending_reqs &= ~GPU_IRQ_RESET_COMPLETED;
+ spin_unlock_irqrestore(&ptdev->gpu->reqs_lock, flags);
+ }
+
+ if (timedout) {
+ drm_err(&ptdev->base, "Soft reset timeout");
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+/**
+ * panthor_gpu_suspend() - Suspend the GPU block.
+ * @ptdev: Device.
+ *
+ * Suspend the GPU irq. This should be called last in the suspend procedure,
+ * after all other blocks have been suspented.
+ */
+void panthor_gpu_suspend(struct panthor_device *ptdev)
+{
+ /*
+ * It may be preferable to simply power down the L2, but for now just
+ * soft-reset which will leave the L2 powered down.
+ */
+ panthor_gpu_soft_reset(ptdev);
+ panthor_gpu_irq_suspend(&ptdev->gpu->irq);
+}
+
+/**
+ * panthor_gpu_resume() - Resume the GPU block.
+ * @ptdev: Device.
+ *
+ * Resume the IRQ handler and power-on the L2-cache.
+ * The FW takes care of powering the other blocks.
+ */
+void panthor_gpu_resume(struct panthor_device *ptdev)
+{
+ panthor_gpu_irq_resume(&ptdev->gpu->irq, GPU_INTERRUPTS_MASK);
+ panthor_gpu_l2_power_on(ptdev);
+}
diff --git a/drivers/gpu/drm/panthor/panthor_gpu.h b/drivers/gpu/drm/panthor/panthor_gpu.h
new file mode 100644
index 000000000000..bba7555dd3c6
--- /dev/null
+++ b/drivers/gpu/drm/panthor/panthor_gpu.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0 or MIT */
+/* Copyright 2018 Marty E. Plummer <hanetzer at startmail.com> */
+/* Copyright 2019 Collabora ltd. */
+
+#ifndef __PANTHOR_GPU_H__
+#define __PANTHOR_GPU_H__
+
+struct panthor_device;
+
+int panthor_gpu_init(struct panthor_device *ptdev);
+void panthor_gpu_unplug(struct panthor_device *ptdev);
+void panthor_gpu_suspend(struct panthor_device *ptdev);
+void panthor_gpu_resume(struct panthor_device *ptdev);
+
+int panthor_gpu_block_power_on(struct panthor_device *ptdev,
+ const char *blk_name,
+ u32 pwron_reg, u32 pwrtrans_reg,
+ u32 rdy_reg, u64 mask, u32 timeout_us);
+int panthor_gpu_block_power_off(struct panthor_device *ptdev,
+ const char *blk_name,
+ u32 pwroff_reg, u32 pwrtrans_reg,
+ u64 mask, u32 timeout_us);
+
+/**
+ * panthor_gpu_power_on() - Power on the GPU block.
+ *
+ * Return: 0 on success, a negative error code otherwise.
+ */
+#define panthor_gpu_power_on(ptdev, type, mask, timeout_us) \
+ panthor_gpu_block_power_on(ptdev, #type, \
+ type ## _PWRON_LO, \
+ type ## _PWRTRANS_LO, \
+ type ## _READY_LO, \
+ mask, timeout_us)
+
+/**
+ * panthor_gpu_power_off() - Power off the GPU block.
+ *
+ * Return: 0 on success, a negative error code otherwise.
+ */
+#define panthor_gpu_power_off(ptdev, type, mask, timeout_us) \
+ panthor_gpu_block_power_off(ptdev, #type, \
+ type ## _PWROFF_LO, \
+ type ## _PWRTRANS_LO, \
+ mask, timeout_us)
+
+int panthor_gpu_l2_power_on(struct panthor_device *ptdev);
+int panthor_gpu_flush_caches(struct panthor_device *ptdev,
+ u32 l2, u32 lsc, u32 other);
+int panthor_gpu_soft_reset(struct panthor_device *ptdev);
+
+#endif
--
2.43.0
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