[PATCH RFC 13/24] drm/lima: add PP related functions

[Qiang Yu <yuq825@gmail.com>]

From: Lima Project Developers <dri-devel@lists.freedesktop.org>

PP is a processor used for OpenGL fragment shader
processing.

Signed-off-by: Qiang Yu <yuq825@gmail.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
---
 drivers/gpu/drm/lima/lima_pp.c | 418 +++++++++++++++++++++++++++++++++
 drivers/gpu/drm/lima/lima_pp.h |  37 +++
 2 files changed, 455 insertions(+)
 create mode 100644 drivers/gpu/drm/lima/lima_pp.c
 create mode 100644 drivers/gpu/drm/lima/lima_pp.h

diff --git a/drivers/gpu/drm/lima/lima_pp.c b/drivers/gpu/drm/lima/lima_pp.c
new file mode 100644
index 000000000000..371d6b70c271
--- /dev/null
+++ b/drivers/gpu/drm/lima/lima_pp.c
@@ -0,0 +1,418 @@
+/*
+ * Copyright (C) 2017-2018 Lima Project
+ *
+ * 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 <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+
+#include <drm/lima_drm.h>
+
+#include "lima_device.h"
+#include "lima_pp.h"
+#include "lima_dlbu.h"
+#include "lima_bcast.h"
+#include "lima_vm.h"
+#include "lima_regs.h"
+
+#define pp_write(reg, data) writel(data, ip->iomem + LIMA_PP_##reg)
+#define pp_read(reg) readl(ip->iomem + LIMA_PP_##reg)
+
+static void lima_pp_handle_irq(struct lima_ip *ip, u32 state)
+{
+	struct lima_device *dev = ip->dev;
+	struct lima_sched_pipe *pipe = dev->pipe + lima_pipe_pp;
+
+	if (state & LIMA_PP_IRQ_MASK_ERROR) {
+		u32 status = pp_read(STATUS);
+
+		dev_err(dev->dev, "pp error irq state=%x status=%x\n",
+			state, status);
+
+		pipe->error = true;
+
+		/* mask all interrupts before hard reset */
+		pp_write(INT_MASK, 0);
+	}
+
+	pp_write(INT_CLEAR, state);
+}
+
+static irqreturn_t lima_pp_irq_handler(int irq, void *data)
+{
+	struct lima_ip *ip = data;
+	struct lima_device *dev = ip->dev;
+	struct lima_sched_pipe *pipe = dev->pipe + lima_pipe_pp;
+	u32 state = pp_read(INT_STATUS);
+
+	/* for shared irq case */
+	if (!state)
+		return IRQ_NONE;
+
+	lima_pp_handle_irq(ip, state);
+
+	if (atomic_dec_and_test(&pipe->task))
+		lima_sched_pipe_task_done(pipe);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t lima_pp_bcast_irq_handler(int irq, void *data)
+{
+	int i;
+	irqreturn_t ret = IRQ_NONE;
+	struct lima_ip *pp_bcast = data;
+	struct lima_device *dev = pp_bcast->dev;
+	struct lima_sched_pipe *pipe = dev->pipe + lima_pipe_pp;
+
+	for (i = 0; i < pipe->num_processor; i++) {
+		struct lima_ip *ip = pipe->processor[i];
+		u32 status, state;
+
+		if (pipe->done & (1 << i))
+			continue;
+
+		/* status read first in case int state change in the middle
+		 * which may miss the interrupt handling */
+		status = pp_read(STATUS);
+		state = pp_read(INT_STATUS);
+
+		if (state) {
+			lima_pp_handle_irq(ip, state);
+			ret = IRQ_HANDLED;
+		}
+		else {
+			if (status & LIMA_PP_STATUS_RENDERING_ACTIVE)
+				continue;
+		}
+
+		pipe->done |= (1 << i);
+		if (atomic_dec_and_test(&pipe->task))
+			lima_sched_pipe_task_done(pipe);
+	}
+
+	return ret;
+}
+
+static void lima_pp_soft_reset_async(struct lima_ip *ip)
+{
+	if (ip->data.async_reset)
+		return;
+
+	pp_write(INT_MASK, 0);
+	pp_write(INT_RAWSTAT, LIMA_PP_IRQ_MASK_ALL);
+	pp_write(CTRL, LIMA_PP_CTRL_SOFT_RESET);
+	ip->data.async_reset = true;
+}
+
+static int lima_pp_soft_reset_async_wait_one(struct lima_ip *ip)
+{
+	struct lima_device *dev = ip->dev;
+	int timeout;
+
+	for (timeout = 1000; timeout > 0; timeout--) {
+		if (!(pp_read(STATUS) & LIMA_PP_STATUS_RENDERING_ACTIVE) &&
+		    pp_read(INT_RAWSTAT) == LIMA_PP_IRQ_RESET_COMPLETED)
+			break;
+	}
+	if (!timeout) {
+		dev_err(dev->dev, "pp %s reset time out\n", lima_ip_name(ip));
+		return -ETIMEDOUT;
+	}
+
+	pp_write(INT_CLEAR, LIMA_PP_IRQ_MASK_ALL);
+	pp_write(INT_MASK, LIMA_PP_IRQ_MASK_USED);
+	return 0;
+}
+
+static int lima_pp_soft_reset_async_wait(struct lima_ip *ip)
+{
+	int i, err = 0;
+
+	if (!ip->data.async_reset)
+		return 0;
+
+	if (ip->id == lima_ip_pp_bcast) {
+		struct lima_device *dev = ip->dev;
+		struct lima_sched_pipe *pipe = dev->pipe + lima_pipe_pp;
+		for (i = 0; i < pipe->num_processor; i++)
+			err |= lima_pp_soft_reset_async_wait_one(pipe->processor[i]);
+	}
+	else
+		err = lima_pp_soft_reset_async_wait_one(ip);
+
+	ip->data.async_reset = false;
+	return err;
+}
+
+static void lima_pp_start_task(struct lima_ip *ip, u32 *frame, u32 *wb,
+			       bool skip_stack_addr)
+{
+	int i, j, n = 0;
+
+	for (i = 0; i < LIMA_PP_FRAME_REG_NUM; i++) {
+		if (skip_stack_addr && i * 4 == LIMA_PP_STACK)
+			continue;
+
+		writel(frame[i], ip->iomem + LIMA_PP_FRAME + i * 4);
+	}
+
+	for (i = 0; i < 3; i++) {
+		for (j = 0; j < LIMA_PP_WB_REG_NUM; j++)
+			writel(wb[n++], ip->iomem + LIMA_PP_WB(i) + j * 4);
+	}
+
+	pp_write(CTRL, LIMA_PP_CTRL_START_RENDERING);
+}
+
+static int lima_pp_hard_reset(struct lima_ip *ip)
+{
+	struct lima_device *dev = ip->dev;
+	int timeout;
+
+	pp_write(PERF_CNT_0_LIMIT, 0xC0FFE000);
+	pp_write(INT_MASK, 0);
+	pp_write(CTRL, LIMA_PP_CTRL_FORCE_RESET);
+	for (timeout = 1000; timeout > 0; timeout--) {
+		pp_write(PERF_CNT_0_LIMIT, 0xC01A0000);
+		if (pp_read(PERF_CNT_0_LIMIT) == 0xC01A0000)
+			break;
+	}
+	if (!timeout) {
+		dev_err(dev->dev, "pp hard reset timeout\n");
+		return -ETIMEDOUT;
+	}
+
+	pp_write(PERF_CNT_0_LIMIT, 0);
+	pp_write(INT_CLEAR, LIMA_PP_IRQ_MASK_ALL);
+	pp_write(INT_MASK, LIMA_PP_IRQ_MASK_USED);
+	return 0;
+}
+
+static void lima_pp_print_version(struct lima_ip *ip)
+{
+	u32 version, major, minor;
+	char *name;
+
+	version = pp_read(VERSION);
+	major = (version >> 8) & 0xFF;
+	minor = version & 0xFF;
+	switch (version >> 16) {
+	case 0xC807:
+	    name = "mali200";
+		break;
+	case 0xCE07:
+		name = "mali300";
+		break;
+	case 0xCD07:
+		name = "mali400";
+		break;
+	case 0xCF07:
+		name = "mali450";
+		break;
+	default:
+		name = "unknow";
+		break;
+	}
+	dev_info(ip->dev->dev, "%s - %s version major %d minor %d\n",
+		 lima_ip_name(ip), name, major, minor);
+}
+
+int lima_pp_init(struct lima_ip *ip)
+{
+	struct lima_device *dev = ip->dev;
+	int err;
+
+	lima_pp_print_version(ip);
+
+	ip->data.async_reset = false;
+	lima_pp_soft_reset_async(ip);
+	err = lima_pp_soft_reset_async_wait(ip);
+	if (err)
+		return err;
+
+	err = devm_request_irq(dev->dev, ip->irq, lima_pp_irq_handler,
+			       IRQF_SHARED, lima_ip_name(ip), ip);
+	if (err) {
+		dev_err(dev->dev, "pp %s fail to request irq\n",
+			lima_ip_name(ip));
+		return err;
+	}
+
+	return 0;
+}
+
+void lima_pp_fini(struct lima_ip *ip)
+{
+	
+}
+
+int lima_pp_bcast_init(struct lima_ip *ip)
+{
+	struct lima_device *dev = ip->dev;
+	int err;
+
+	err = devm_request_irq(dev->dev, ip->irq, lima_pp_bcast_irq_handler,
+			       IRQF_SHARED, lima_ip_name(ip), ip);
+	if (err) {
+		dev_err(dev->dev, "pp %s fail to request irq\n",
+			lima_ip_name(ip));
+		return err;
+	}
+
+	return 0;
+}
+
+void lima_pp_bcast_fini(struct lima_ip *ip)
+{
+	
+}
+
+static int lima_pp_task_validate(struct lima_sched_pipe *pipe,
+				 struct lima_sched_task *task)
+{
+	if (!pipe->bcast_processor) {
+		struct drm_lima_m400_pp_frame *f = task->frame;
+
+		if (f->num_pp > pipe->num_processor)
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void lima_pp_task_run(struct lima_sched_pipe *pipe,
+			     struct lima_sched_task *task)
+{
+	if (pipe->bcast_processor) {
+		struct drm_lima_m450_pp_frame *frame = task->frame;
+		struct lima_device *dev = pipe->bcast_processor->dev;
+		int i;
+
+		pipe->done = 0;
+		atomic_set(&pipe->task, pipe->num_processor);
+
+		frame->frame[LIMA_PP_FRAME >> 2] = LIMA_VA_RESERVE_DLBU;
+		lima_dlbu_set_reg(dev->ip + lima_ip_dlbu, frame->dlbu_regs);
+
+		lima_pp_soft_reset_async_wait(pipe->bcast_processor);
+
+		for (i = 0; i < pipe->num_processor; i++) {
+			struct lima_ip *ip = pipe->processor[i];
+			pp_write(STACK, frame->fragment_stack_address[i]);
+		}
+
+		lima_pp_start_task(pipe->bcast_processor, frame->frame,
+				   frame->wb, true);
+	}
+	else {
+		struct drm_lima_m400_pp_frame *frame = task->frame;
+		int i;
+
+		atomic_set(&pipe->task, frame->num_pp);
+
+		for (i = 0; i < frame->num_pp; i++) {
+			frame->frame[LIMA_PP_FRAME >> 2] =
+				frame->plbu_array_address[i];
+			frame->frame[LIMA_PP_STACK >> 2] =
+				frame->fragment_stack_address[i];
+
+			lima_pp_soft_reset_async_wait(pipe->processor[i]);
+
+			lima_pp_start_task(pipe->processor[i], frame->frame,
+					   frame->wb, false);
+		}
+	}
+}
+
+static void lima_pp_task_fini(struct lima_sched_pipe *pipe)
+{
+	if (pipe->bcast_processor)
+		lima_pp_soft_reset_async(pipe->bcast_processor);
+	else {
+		int i;
+		for (i = 0; i < pipe->num_processor; i++)
+			lima_pp_soft_reset_async(pipe->processor[i]);
+	}
+}
+
+static void lima_pp_task_error(struct lima_sched_pipe *pipe)
+{
+	int i;
+
+	if (pipe->bcast_processor)
+		lima_bcast_disable(pipe->bcast_processor->dev);
+
+	for (i = 0; i < pipe->num_processor; i++)
+		lima_pp_hard_reset(pipe->processor[i]);
+
+	if (pipe->bcast_processor)
+		lima_bcast_enable(pipe->bcast_processor->dev);
+}
+
+static void lima_pp_task_mmu_error(struct lima_sched_pipe *pipe)
+{
+	if (atomic_dec_and_test(&pipe->task))
+		lima_sched_pipe_task_done(pipe);
+}
+
+static struct kmem_cache *lima_pp_task_slab = NULL;
+static int lima_pp_task_slab_refcnt = 0;
+
+int lima_pp_pipe_init(struct lima_device *dev)
+{
+	int frame_size;
+	struct lima_sched_pipe *pipe = dev->pipe + lima_pipe_pp;
+
+	if (dev->id == lima_gpu_mali400)
+		frame_size = sizeof(struct drm_lima_m400_pp_frame);
+	else
+		frame_size = sizeof(struct drm_lima_m450_pp_frame);
+
+	if (!lima_pp_task_slab) {
+		lima_pp_task_slab = kmem_cache_create(
+			"lima_pp_task", sizeof(struct lima_sched_task) + frame_size,
+			0, SLAB_HWCACHE_ALIGN, NULL);
+		if (!lima_pp_task_slab)
+			return -ENOMEM;
+	}
+	lima_pp_task_slab_refcnt++;
+
+	pipe->frame_size = frame_size;
+	pipe->task_slab = lima_pp_task_slab;
+
+	pipe->task_validate = lima_pp_task_validate;
+	pipe->task_run = lima_pp_task_run;
+	pipe->task_fini = lima_pp_task_fini;
+	pipe->task_error = lima_pp_task_error;
+	pipe->task_mmu_error = lima_pp_task_mmu_error;
+
+	return 0;
+}
+
+void lima_pp_pipe_fini(struct lima_device *dev)
+{
+	if (!--lima_pp_task_slab_refcnt) {
+		kmem_cache_destroy(lima_pp_task_slab);
+		lima_pp_task_slab = NULL;
+	}
+}
diff --git a/drivers/gpu/drm/lima/lima_pp.h b/drivers/gpu/drm/lima/lima_pp.h
new file mode 100644
index 000000000000..4bd1d9fcbcdf
--- /dev/null
+++ b/drivers/gpu/drm/lima/lima_pp.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2017-2018 Lima Project
+ *
+ * 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.
+ */
+#ifndef __LIMA_PP_H__
+#define __LIMA_PP_H__
+
+struct lima_ip;
+struct lima_device;
+
+int lima_pp_init(struct lima_ip *ip);
+void lima_pp_fini(struct lima_ip *ip);
+
+int lima_pp_bcast_init(struct lima_ip *ip);
+void lima_pp_bcast_fini(struct lima_ip *ip);
+
+int lima_pp_pipe_init(struct lima_device *dev);
+void lima_pp_pipe_fini(struct lima_device *dev);
+
+#endif
-- 
2.17.0

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