gpu: host1x: Support DMA mapping of buffers
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 <treding@nvidia.com>
diff --git a/drivers/gpu/host1x/job.c b/drivers/gpu/host1x/job.c
index 2e0c3e0..25ca54d 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++;
@@ -567,6 +616,8 @@ 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) {
@@ -576,7 +627,11 @@ 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);
}
