From: Thierry Reding <tred...@nvidia.com>
If host1x_bo_pin() returns an SG table, create a DMA mapping for the
buffer. For buffers that the host1x client has already mapped itself,
host1x_bo_pin() returns NULL and the existing DMA address is used.
Signed-off-by: Thierry Reding <tred...@nvidia.com>
---
drivers/gpu/drm/tegra/gem.c | 18 +++++++--
drivers/gpu/host1x/dev.c | 16 ++------
drivers/gpu/host1x/job.c | 73 ++++++++++++++++++++++++++++++++-----
drivers/gpu/host1x/job.h | 4 ++
4 files changed, 87 insertions(+), 24 deletions(-)
diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index 564ef60f67c2..746dae32c484 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -34,9 +34,19 @@ static struct sg_table *tegra_bo_pin(struct device *dev,
struct host1x_bo *bo,
struct sg_table *sgt;
int err;
- if (phys)
+ /*
+ * If we've manually mapped the buffer object through the IOMMU, make
+ * sure to return the IOVA address of our mapping.
+ */
+ if (phys && obj->mm) {
*phys = obj->iova;
+ return NULL;
+ }
+ /*
+ * If we don't have a mapping for this buffer yet, return an SG table
+ * so that host1x can do the mapping for us via the DMA API.
+ */
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
if (!sgt)
return ERR_PTR(-ENOMEM);
@@ -62,8 +72,10 @@ static struct sg_table *tegra_bo_pin(struct device *dev,
struct host1x_bo *bo,
static void tegra_bo_unpin(struct device *dev, struct sg_table *sgt)
{
- sg_free_table(sgt);
- kfree(sgt);
+ if (sgt) {
+ sg_free_table(sgt);
+ kfree(sgt);
+ }
}
static void *tegra_bo_mmap(struct host1x_bo *bo)
diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
index e8ab4d0c5091..18b6fc5e5b2e 100644
--- a/drivers/gpu/host1x/dev.c
+++ b/drivers/gpu/host1x/dev.c
@@ -18,10 +18,6 @@
#include <trace/events/host1x.h>
#undef CREATE_TRACE_POINTS
-#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
-#include <asm/dma-iommu.h>
-#endif
-
#include "bus.h"
#include "channel.h"
#include "debug.h"
@@ -273,17 +269,13 @@ static int host1x_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "failed to get reset: %d\n", err);
return err;
}
-#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
- if (host->dev->archdata.mapping) {
- struct dma_iommu_mapping *mapping =
- to_dma_iommu_mapping(host->dev);
- arm_iommu_detach_device(host->dev);
- arm_iommu_release_mapping(mapping);
- }
-#endif
+
if (IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL))
goto skip_iommu;
+ if (iommu_get_domain_for_dev(&pdev->dev))
+ goto skip_iommu;
+
host->group = iommu_group_get(&pdev->dev);
if (host->group) {
struct iommu_domain_geometry *geometry;
diff --git a/drivers/gpu/host1x/job.c b/drivers/gpu/host1x/job.c
index 90dd592fdfca..10c5fb8136e9 100644
--- a/drivers/gpu/host1x/job.c
+++ b/drivers/gpu/host1x/job.c
@@ -99,7 +99,8 @@ EXPORT_SYMBOL(host1x_job_add_gather);
static unsigned int pin_job(struct host1x *host, struct host1x_job *job)
{
- struct device *dev = job->client->dev;
+ struct host1x_client *client = job->client;
+ struct device *dev = client->dev;
unsigned int i;
int err;
@@ -107,8 +108,8 @@ static unsigned int pin_job(struct host1x *host, struct
host1x_job *job)
for (i = 0; i < job->num_relocs; i++) {
struct host1x_reloc *reloc = &job->relocs[i];
+ dma_addr_t phys_addr, *phys;
struct sg_table *sgt;
- dma_addr_t phys_addr;
reloc->target.bo = host1x_bo_get(reloc->target.bo);
if (!reloc->target.bo) {
@@ -116,12 +117,51 @@ static unsigned int pin_job(struct host1x *host, struct
host1x_job *job)
goto unpin;
}
- sgt = host1x_bo_pin(dev, reloc->target.bo, &phys_addr);
+ if (client->group)
+ phys = &phys_addr;
+ else
+ phys = NULL;
+
+ sgt = host1x_bo_pin(dev, reloc->target.bo, phys);
if (IS_ERR(sgt)) {
err = PTR_ERR(sgt);
goto unpin;
}
+ if (sgt) {
+ unsigned long mask = HOST1X_RELOC_READ |
+ HOST1X_RELOC_WRITE;
+ enum dma_data_direction dir;
+
+ switch (reloc->flags & mask) {
+ case HOST1X_RELOC_READ:
+ dir = DMA_TO_DEVICE;
+ break;
+
+ case HOST1X_RELOC_WRITE:
+ dir = DMA_FROM_DEVICE;
+ break;
+
+ case HOST1X_RELOC_READ | HOST1X_RELOC_WRITE:
+ dir = DMA_BIDIRECTIONAL;
+ break;
+
+ default:
+ err = -EINVAL;
+ goto unpin;
+ }
+
+ err = dma_map_sg(dev, sgt->sgl, sgt->nents, dir);
+ if (!err) {
+ err = -ENOMEM;
+ goto unpin;
+ }
+
+ job->unpins[job->num_unpins].dev = dev;
+ job->unpins[job->num_unpins].dir = dir;
+ phys_addr = sg_dma_address(sgt->sgl);
+ }
+
job->addr_phys[job->num_unpins] = phys_addr;
job->unpins[job->num_unpins].bo = reloc->target.bo;
job->unpins[job->num_unpins].sgt = sgt;
@@ -144,7 +184,7 @@ static unsigned int pin_job(struct host1x *host, struct
host1x_job *job)
goto unpin;
}
- sgt = host1x_bo_pin(host->dev, g->bo, &phys_addr);
+ sgt = host1x_bo_pin(host->dev, g->bo, NULL);
if (IS_ERR(sgt)) {
err = PTR_ERR(sgt);
goto unpin;
@@ -172,15 +212,24 @@ static unsigned int pin_job(struct host1x *host, struct
host1x_job *job)
goto unpin;
}
- job->addr_phys[job->num_unpins] =
- iova_dma_addr(&host->iova, alloc);
job->unpins[job->num_unpins].size = gather_size;
+ phys_addr = iova_dma_addr(&host->iova, alloc);
} else {
- job->addr_phys[job->num_unpins] = phys_addr;
+ err = dma_map_sg(host->dev, sgt->sgl, sgt->nents,
+ DMA_TO_DEVICE);
+ if (!err) {
+ err = -ENOMEM;
+ goto unpin;
+ }
+
+ job->unpins[job->num_unpins].dev = host->dev;
+ phys_addr = sg_dma_address(sgt->sgl);
}
- job->gather_addr_phys[i] = job->addr_phys[job->num_unpins];
+ job->addr_phys[job->num_unpins] = phys_addr;
+ job->gather_addr_phys[i] = phys_addr;
+ job->unpins[job->num_unpins].dir = DMA_TO_DEVICE;
job->unpins[job->num_unpins].bo = g->bo;
job->unpins[job->num_unpins].sgt = sgt;
job->num_unpins++;
@@ -566,6 +615,8 @@ void host1x_job_unpin(struct host1x_job *job)
for (i = 0; i < job->num_unpins; i++) {
struct host1x_job_unpin_data *unpin = &job->unpins[i];
+ struct device *dev = unpin->dev ?: host->dev;
+ struct sg_table *sgt = unpin->sgt;
if (!IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL) &&
unpin->size && host->domain) {
@@ -575,7 +626,11 @@ void host1x_job_unpin(struct host1x_job *job)
iova_pfn(&host->iova, job->addr_phys[i]));
}
- host1x_bo_unpin(host->dev, unpin->bo, unpin->sgt);
+ if (unpin->dev && sgt)
+ dma_unmap_sg(unpin->dev, sgt->sgl, sgt->nents,
+ unpin->dir);
+
+ host1x_bo_unpin(dev, unpin->bo, sgt);
host1x_bo_put(unpin->bo);
}
diff --git a/drivers/gpu/host1x/job.h b/drivers/gpu/host1x/job.h
index 62b8805e6b35..94bc2e4ae241 100644
--- a/drivers/gpu/host1x/job.h
+++ b/drivers/gpu/host1x/job.h
@@ -8,6 +8,8 @@
#ifndef __HOST1X_JOB_H
#define __HOST1X_JOB_H
+#include <linux/dma-direction.h>
+
struct host1x_job_gather {
unsigned int words;
dma_addr_t base;
@@ -19,7 +21,9 @@ struct host1x_job_gather {
struct host1x_job_unpin_data {
struct host1x_bo *bo;
struct sg_table *sgt;
+ struct device *dev;
size_t size;
+ enum dma_data_direction dir;
};
/*
--
2.23.0
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