1 files changed, 684 insertions, 0 deletions

diff --git a/drivers/gpu/host1x/job.c b/drivers/gpu/host1x/job.c
new file mode 100644
index 000000000..b2761aa03
--- /dev/null
+++ b/drivers/gpu/host1x/job.c
@@ -0,0 +1,684 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Tegra host1x Job
+ *
+ * Copyright (c) 2010-2015, NVIDIA Corporation.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/host1x.h>
+#include <linux/iommu.h>
+#include <linux/kref.h>
+#include <linux/module.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <trace/events/host1x.h>
+
+#include "channel.h"
+#include "dev.h"
+#include "job.h"
+#include "syncpt.h"
+
+#define HOST1X_WAIT_SYNCPT_OFFSET 0x8
+
+struct host1x_job *host1x_job_alloc(struct host1x_channel *ch,
+				    u32 num_cmdbufs, u32 num_relocs,
+				    bool skip_firewall)
+{
+	struct host1x_job *job = NULL;
+	unsigned int num_unpins = num_relocs;
+	bool enable_firewall;
+	u64 total;
+	void *mem;
+
+	enable_firewall = IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL) && !skip_firewall;
+
+	if (!enable_firewall)
+		num_unpins += num_cmdbufs;
+
+	/* Check that we're not going to overflow */
+	total = sizeof(struct host1x_job) +
+		(u64)num_relocs * sizeof(struct host1x_reloc) +
+		(u64)num_unpins * sizeof(struct host1x_job_unpin_data) +
+		(u64)num_cmdbufs * sizeof(struct host1x_job_cmd) +
+		(u64)num_unpins * sizeof(dma_addr_t) +
+		(u64)num_unpins * sizeof(u32 *);
+	if (total > ULONG_MAX)
+		return NULL;
+
+	mem = job = kzalloc(total, GFP_KERNEL);
+	if (!job)
+		return NULL;
+
+	job->enable_firewall = enable_firewall;
+
+	kref_init(&job->ref);
+	job->channel = ch;
+
+	/* Redistribute memory to the structs  */
+	mem += sizeof(struct host1x_job);
+	job->relocs = num_relocs ? mem : NULL;
+	mem += num_relocs * sizeof(struct host1x_reloc);
+	job->unpins = num_unpins ? mem : NULL;
+	mem += num_unpins * sizeof(struct host1x_job_unpin_data);
+	job->cmds = num_cmdbufs ? mem : NULL;
+	mem += num_cmdbufs * sizeof(struct host1x_job_cmd);
+	job->addr_phys = num_unpins ? mem : NULL;
+
+	job->reloc_addr_phys = job->addr_phys;
+	job->gather_addr_phys = &job->addr_phys[num_relocs];
+
+	return job;
+}
+EXPORT_SYMBOL(host1x_job_alloc);
+
+struct host1x_job *host1x_job_get(struct host1x_job *job)
+{
+	kref_get(&job->ref);
+	return job;
+}
+EXPORT_SYMBOL(host1x_job_get);
+
+static void job_free(struct kref *ref)
+{
+	struct host1x_job *job = container_of(ref, struct host1x_job, ref);
+
+	if (job->release)
+		job->release(job);
+
+	if (job->waiter)
+		host1x_intr_put_ref(job->syncpt->host, job->syncpt->id,
+				    job->waiter, false);
+
+	if (job->syncpt)
+		host1x_syncpt_put(job->syncpt);
+
+	kfree(job);
+}
+
+void host1x_job_put(struct host1x_job *job)
+{
+	kref_put(&job->ref, job_free);
+}
+EXPORT_SYMBOL(host1x_job_put);
+
+void host1x_job_add_gather(struct host1x_job *job, struct host1x_bo *bo,
+			   unsigned int words, unsigned int offset)
+{
+	struct host1x_job_gather *gather = &job->cmds[job->num_cmds].gather;
+
+	gather->words = words;
+	gather->bo = bo;
+	gather->offset = offset;
+
+	job->num_cmds++;
+}
+EXPORT_SYMBOL(host1x_job_add_gather);
+
+void host1x_job_add_wait(struct host1x_job *job, u32 id, u32 thresh,
+			 bool relative, u32 next_class)
+{
+	struct host1x_job_cmd *cmd = &job->cmds[job->num_cmds];
+
+	cmd->is_wait = true;
+	cmd->wait.id = id;
+	cmd->wait.threshold = thresh;
+	cmd->wait.next_class = next_class;
+	cmd->wait.relative = relative;
+
+	job->num_cmds++;
+}
+EXPORT_SYMBOL(host1x_job_add_wait);
+
+static unsigned int pin_job(struct host1x *host, struct host1x_job *job)
+{
+	unsigned long mask = HOST1X_RELOC_READ | HOST1X_RELOC_WRITE;
+	struct host1x_client *client = job->client;
+	struct device *dev = client->dev;
+	struct host1x_job_gather *g;
+	unsigned int i;
+	int err;
+
+	job->num_unpins = 0;
+
+	for (i = 0; i < job->num_relocs; i++) {
+		struct host1x_reloc *reloc = &job->relocs[i];
+		enum dma_data_direction direction;
+		struct host1x_bo_mapping *map;
+		struct host1x_bo *bo;
+
+		reloc->target.bo = host1x_bo_get(reloc->target.bo);
+		if (!reloc->target.bo) {
+			err = -EINVAL;
+			goto unpin;
+		}
+
+		bo = reloc->target.bo;
+
+		switch (reloc->flags & mask) {
+		case HOST1X_RELOC_READ:
+			direction = DMA_TO_DEVICE;
+			break;
+
+		case HOST1X_RELOC_WRITE:
+			direction = DMA_FROM_DEVICE;
+			break;
+
+		case HOST1X_RELOC_READ | HOST1X_RELOC_WRITE:
+			direction = DMA_BIDIRECTIONAL;
+			break;
+
+		default:
+			err = -EINVAL;
+			goto unpin;
+		}
+
+		map = host1x_bo_pin(dev, bo, direction, NULL);
+		if (IS_ERR(map)) {
+			err = PTR_ERR(map);
+			goto unpin;
+		}
+
+		/*
+		 * host1x clients are generally not able to do scatter-gather themselves, so fail
+		 * if the buffer is discontiguous and we fail to map its SG table to a single
+		 * contiguous chunk of I/O virtual memory.
+		 */
+		if (map->chunks > 1) {
+			err = -EINVAL;
+			goto unpin;
+		}
+
+		job->addr_phys[job->num_unpins] = map->phys;
+		job->unpins[job->num_unpins].map = map;
+		job->num_unpins++;
+	}
+
+	/*
+	 * We will copy gathers BO content later, so there is no need to
+	 * hold and pin them.
+	 */
+	if (job->enable_firewall)
+		return 0;
+
+	for (i = 0; i < job->num_cmds; i++) {
+		struct host1x_bo_mapping *map;
+		size_t gather_size = 0;
+		struct scatterlist *sg;
+		unsigned long shift;
+		struct iova *alloc;
+		unsigned int j;
+
+		if (job->cmds[i].is_wait)
+			continue;
+
+		g = &job->cmds[i].gather;
+
+		g->bo = host1x_bo_get(g->bo);
+		if (!g->bo) {
+			err = -EINVAL;
+			goto unpin;
+		}
+
+		map = host1x_bo_pin(host->dev, g->bo, DMA_TO_DEVICE, NULL);
+		if (IS_ERR(map)) {
+			err = PTR_ERR(map);
+			goto unpin;
+		}
+
+		if (host->domain) {
+			for_each_sgtable_sg(map->sgt, sg, j)
+				gather_size += sg->length;
+
+			gather_size = iova_align(&host->iova, gather_size);
+
+			shift = iova_shift(&host->iova);
+			alloc = alloc_iova(&host->iova, gather_size >> shift,
+					   host->iova_end >> shift, true);
+			if (!alloc) {
+				err = -ENOMEM;
+				goto put;
+			}
+
+			err = iommu_map_sgtable(host->domain, iova_dma_addr(&host->iova, alloc),
+						map->sgt, IOMMU_READ);
+			if (err == 0) {
+				__free_iova(&host->iova, alloc);
+				err = -EINVAL;
+				goto put;
+			}
+
+			map->phys = iova_dma_addr(&host->iova, alloc);
+			map->size = gather_size;
+		}
+
+		job->addr_phys[job->num_unpins] = map->phys;
+		job->unpins[job->num_unpins].map = map;
+		job->num_unpins++;
+
+		job->gather_addr_phys[i] = map->phys;
+	}
+
+	return 0;
+
+put:
+	host1x_bo_put(g->bo);
+unpin:
+	host1x_job_unpin(job);
+	return err;
+}
+
+static int do_relocs(struct host1x_job *job, struct host1x_job_gather *g)
+{
+	void *cmdbuf_addr = NULL;
+	struct host1x_bo *cmdbuf = g->bo;
+	unsigned int i;
+
+	/* pin & patch the relocs for one gather */
+	for (i = 0; i < job->num_relocs; i++) {
+		struct host1x_reloc *reloc = &job->relocs[i];
+		u32 reloc_addr = (job->reloc_addr_phys[i] +
+				  reloc->target.offset) >> reloc->shift;
+		u32 *target;
+
+		/* skip all other gathers */
+		if (cmdbuf != reloc->cmdbuf.bo)
+			continue;
+
+		if (job->enable_firewall) {
+			target = (u32 *)job->gather_copy_mapped +
+					reloc->cmdbuf.offset / sizeof(u32) +
+						g->offset / sizeof(u32);
+			goto patch_reloc;
+		}
+
+		if (!cmdbuf_addr) {
+			cmdbuf_addr = host1x_bo_mmap(cmdbuf);
+
+			if (unlikely(!cmdbuf_addr)) {
+				pr_err("Could not map cmdbuf for relocation\n");
+				return -ENOMEM;
+			}
+		}
+
+		target = cmdbuf_addr + reloc->cmdbuf.offset;
+patch_reloc:
+		*target = reloc_addr;
+	}
+
+	if (cmdbuf_addr)
+		host1x_bo_munmap(cmdbuf, cmdbuf_addr);
+
+	return 0;
+}
+
+static bool check_reloc(struct host1x_reloc *reloc, struct host1x_bo *cmdbuf,
+			unsigned int offset)
+{
+	offset *= sizeof(u32);
+
+	if (reloc->cmdbuf.bo != cmdbuf || reloc->cmdbuf.offset != offset)
+		return false;
+
+	/* relocation shift value validation isn't implemented yet */
+	if (reloc->shift)
+		return false;
+
+	return true;
+}
+
+struct host1x_firewall {
+	struct host1x_job *job;
+	struct device *dev;
+
+	unsigned int num_relocs;
+	struct host1x_reloc *reloc;
+
+	struct host1x_bo *cmdbuf;
+	unsigned int offset;
+
+	u32 words;
+	u32 class;
+	u32 reg;
+	u32 mask;
+	u32 count;
+};
+
+static int check_register(struct host1x_firewall *fw, unsigned long offset)
+{
+	if (!fw->job->is_addr_reg)
+		return 0;
+
+	if (fw->job->is_addr_reg(fw->dev, fw->class, offset)) {
+		if (!fw->num_relocs)
+			return -EINVAL;
+
+		if (!check_reloc(fw->reloc, fw->cmdbuf, fw->offset))
+			return -EINVAL;
+
+		fw->num_relocs--;
+		fw->reloc++;
+	}
+
+	return 0;
+}
+
+static int check_class(struct host1x_firewall *fw, u32 class)
+{
+	if (!fw->job->is_valid_class) {
+		if (fw->class != class)
+			return -EINVAL;
+	} else {
+		if (!fw->job->is_valid_class(fw->class))
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int check_mask(struct host1x_firewall *fw)
+{
+	u32 mask = fw->mask;
+	u32 reg = fw->reg;
+	int ret;
+
+	while (mask) {
+		if (fw->words == 0)
+			return -EINVAL;
+
+		if (mask & 1) {
+			ret = check_register(fw, reg);
+			if (ret < 0)
+				return ret;
+
+			fw->words--;
+			fw->offset++;
+		}
+		mask >>= 1;
+		reg++;
+	}
+
+	return 0;
+}
+
+static int check_incr(struct host1x_firewall *fw)
+{
+	u32 count = fw->count;
+	u32 reg = fw->reg;
+	int ret;
+
+	while (count) {
+		if (fw->words == 0)
+			return -EINVAL;
+
+		ret = check_register(fw, reg);
+		if (ret < 0)
+			return ret;
+
+		reg++;
+		fw->words--;
+		fw->offset++;
+		count--;
+	}
+
+	return 0;
+}
+
+static int check_nonincr(struct host1x_firewall *fw)
+{
+	u32 count = fw->count;
+	int ret;
+
+	while (count) {
+		if (fw->words == 0)
+			return -EINVAL;
+
+		ret = check_register(fw, fw->reg);
+		if (ret < 0)
+			return ret;
+
+		fw->words--;
+		fw->offset++;
+		count--;
+	}
+
+	return 0;
+}
+
+static int validate(struct host1x_firewall *fw, struct host1x_job_gather *g)
+{
+	u32 *cmdbuf_base = (u32 *)fw->job->gather_copy_mapped +
+		(g->offset / sizeof(u32));
+	u32 job_class = fw->class;
+	int err = 0;
+
+	fw->words = g->words;
+	fw->cmdbuf = g->bo;
+	fw->offset = 0;
+
+	while (fw->words && !err) {
+		u32 word = cmdbuf_base[fw->offset];
+		u32 opcode = (word & 0xf0000000) >> 28;
+
+		fw->mask = 0;
+		fw->reg = 0;
+		fw->count = 0;
+		fw->words--;
+		fw->offset++;
+
+		switch (opcode) {
+		case 0:
+			fw->class = word >> 6 & 0x3ff;
+			fw->mask = word & 0x3f;
+			fw->reg = word >> 16 & 0xfff;
+			err = check_class(fw, job_class);
+			if (!err)
+				err = check_mask(fw);
+			if (err)
+				goto out;
+			break;
+		case 1:
+			fw->reg = word >> 16 & 0xfff;
+			fw->count = word & 0xffff;
+			err = check_incr(fw);
+			if (err)
+				goto out;
+			break;
+
+		case 2:
+			fw->reg = word >> 16 & 0xfff;
+			fw->count = word & 0xffff;
+			err = check_nonincr(fw);
+			if (err)
+				goto out;
+			break;
+
+		case 3:
+			fw->mask = word & 0xffff;
+			fw->reg = word >> 16 & 0xfff;
+			err = check_mask(fw);
+			if (err)
+				goto out;
+			break;
+		case 4:
+		case 14:
+			break;
+		default:
+			err = -EINVAL;
+			break;
+		}
+	}
+
+out:
+	return err;
+}
+
+static inline int copy_gathers(struct device *host, struct host1x_job *job,
+			       struct device *dev)
+{
+	struct host1x_firewall fw;
+	size_t size = 0;
+	size_t offset = 0;
+	unsigned int i;
+
+	fw.job = job;
+	fw.dev = dev;
+	fw.reloc = job->relocs;
+	fw.num_relocs = job->num_relocs;
+	fw.class = job->class;
+
+	for (i = 0; i < job->num_cmds; i++) {
+		struct host1x_job_gather *g;
+
+		if (job->cmds[i].is_wait)
+			continue;
+
+		g = &job->cmds[i].gather;
+
+		size += g->words * sizeof(u32);
+	}
+
+	/*
+	 * Try a non-blocking allocation from a higher priority pools first,
+	 * as awaiting for the allocation here is a major performance hit.
+	 */
+	job->gather_copy_mapped = dma_alloc_wc(host, size, &job->gather_copy,
+					       GFP_NOWAIT);
+
+	/* the higher priority allocation failed, try the generic-blocking */
+	if (!job->gather_copy_mapped)
+		job->gather_copy_mapped = dma_alloc_wc(host, size,
+						       &job->gather_copy,
+						       GFP_KERNEL);
+	if (!job->gather_copy_mapped)
+		return -ENOMEM;
+
+	job->gather_copy_size = size;
+
+	for (i = 0; i < job->num_cmds; i++) {
+		struct host1x_job_gather *g;
+		void *gather;
+
+		if (job->cmds[i].is_wait)
+			continue;
+		g = &job->cmds[i].gather;
+
+		/* Copy the gather */
+		gather = host1x_bo_mmap(g->bo);
+		memcpy(job->gather_copy_mapped + offset, gather + g->offset,
+		       g->words * sizeof(u32));
+		host1x_bo_munmap(g->bo, gather);
+
+		/* Store the location in the buffer */
+		g->base = job->gather_copy;
+		g->offset = offset;
+
+		/* Validate the job */
+		if (validate(&fw, g))
+			return -EINVAL;
+
+		offset += g->words * sizeof(u32);
+	}
+
+	/* No relocs should remain at this point */
+	if (fw.num_relocs)
+		return -EINVAL;
+
+	return 0;
+}
+
+int host1x_job_pin(struct host1x_job *job, struct device *dev)
+{
+	int err;
+	unsigned int i, j;
+	struct host1x *host = dev_get_drvdata(dev->parent);
+
+	/* pin memory */
+	err = pin_job(host, job);
+	if (err)
+		goto out;
+
+	if (job->enable_firewall) {
+		err = copy_gathers(host->dev, job, dev);
+		if (err)
+			goto out;
+	}
+
+	/* patch gathers */
+	for (i = 0; i < job->num_cmds; i++) {
+		struct host1x_job_gather *g;
+
+		if (job->cmds[i].is_wait)
+			continue;
+		g = &job->cmds[i].gather;
+
+		/* process each gather mem only once */
+		if (g->handled)
+			continue;
+
+		/* copy_gathers() sets gathers base if firewall is enabled */
+		if (!job->enable_firewall)
+			g->base = job->gather_addr_phys[i];
+
+		for (j = i + 1; j < job->num_cmds; j++) {
+			if (!job->cmds[j].is_wait &&
+			    job->cmds[j].gather.bo == g->bo) {
+				job->cmds[j].gather.handled = true;
+				job->cmds[j].gather.base = g->base;
+			}
+		}
+
+		err = do_relocs(job, g);
+		if (err)
+			break;
+	}
+
+out:
+	if (err)
+		host1x_job_unpin(job);
+	wmb();
+
+	return err;
+}
+EXPORT_SYMBOL(host1x_job_pin);
+
+void host1x_job_unpin(struct host1x_job *job)
+{
+	struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
+	unsigned int i;
+
+	for (i = 0; i < job->num_unpins; i++) {
+		struct host1x_bo_mapping *map = job->unpins[i].map;
+		struct host1x_bo *bo = map->bo;
+
+		if (!job->enable_firewall && map->size && host->domain) {
+			iommu_unmap(host->domain, job->addr_phys[i], map->size);
+			free_iova(&host->iova, iova_pfn(&host->iova, job->addr_phys[i]));
+		}
+
+		host1x_bo_unpin(map);
+		host1x_bo_put(bo);
+	}
+
+	job->num_unpins = 0;
+
+	if (job->gather_copy_size)
+		dma_free_wc(host->dev, job->gather_copy_size,
+			    job->gather_copy_mapped, job->gather_copy);
+}
+EXPORT_SYMBOL(host1x_job_unpin);
+
+/*
+ * Debug routine used to dump job entries
+ */
+void host1x_job_dump(struct device *dev, struct host1x_job *job)
+{
+	dev_dbg(dev, "    SYNCPT_ID   %d\n", job->syncpt->id);
+	dev_dbg(dev, "    SYNCPT_VAL  %d\n", job->syncpt_end);
+	dev_dbg(dev, "    FIRST_GET   0x%x\n", job->first_get);
+	dev_dbg(dev, "    TIMEOUT     %d\n", job->timeout);
+	dev_dbg(dev, "    NUM_SLOTS   %d\n", job->num_slots);
+	dev_dbg(dev, "    NUM_HANDLES %d\n", job->num_unpins);
+}