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firmware: tegra: Prepare for supporting in-band debugfs 

Currently, BPMP debug information is accessible via the Linux debugfs
file-system using a shared-memory scheme. More recent BPMP firmware now
supports accessing the debug information by in-band messaging which does
not require shared-memory. To prepare for adding in-band debugfs support
for the BPMP, move the shared-memory specific initialisation from the
tegra_bpmp_init_debugfs() into a sub-function.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Jon Hunter 2020-07-12 11:01:16 +01:00 committed by Thierry Reding
parent edb2bca2ac
commit cc8d0a4538
1 changed files with 23 additions and 30 deletions
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53
drivers/firmware/tegra/bpmp-debugfs.c
View File

@ -354,32 +354,43 @@ static int bpmp_populate_dir(struct tegra_bpmp *bpmp, struct seqbuf *seqbuf,
return 0;
}
static int create_debugfs_mirror(struct tegra_bpmp *bpmp, void *buf,
size_t bufsize, struct dentry *root)
static int bpmp_populate_debugfs_shmem(struct tegra_bpmp *bpmp,
struct dentry *root)
{
struct seqbuf seqbuf;
const size_t sz = SZ_512K;
dma_addr_t phys;
size_t nbytes;
void *virt;
int err;
bpmp->debugfs_mirror = debugfs_create_dir("debug", root);
if (!bpmp->debugfs_mirror)
return -ENOMEM;
seqbuf_init(&seqbuf, buf, bufsize);
err = bpmp_populate_dir(bpmp, &seqbuf, bpmp->debugfs_mirror, 0);
virt = dma_alloc_coherent(bpmp->dev, sz, &phys,
GFP_KERNEL | GFP_DMA32);
if (!virt)
return -ENOMEM;
err = mrq_debugfs_dumpdir(bpmp, phys, sz, &nbytes);
if (err < 0) {
debugfs_remove_recursive(bpmp->debugfs_mirror);
bpmp->debugfs_mirror = NULL;
goto free;
} else if (nbytes > sz) {
err = -EINVAL;
goto free;
}
seqbuf_init(&seqbuf, virt, nbytes);
err = bpmp_populate_dir(bpmp, &seqbuf, bpmp->debugfs_mirror, 0);
free:
dma_free_coherent(bpmp->dev, sz, virt, phys);
return err;
}
int tegra_bpmp_init_debugfs(struct tegra_bpmp *bpmp)
{
dma_addr_t phys;
void *virt;
const size_t sz = SZ_512K;
size_t nbytes;
struct dentry *root;
int err;
@ -390,27 +401,9 @@ int tegra_bpmp_init_debugfs(struct tegra_bpmp *bpmp)
if (!root)
return -ENOMEM;
virt = dma_alloc_coherent(bpmp->dev, sz, &phys,
GFP_KERNEL | GFP_DMA32);
if (!virt) {
err = -ENOMEM;
goto out;
}
err = mrq_debugfs_dumpdir(bpmp, phys, sz, &nbytes);
if (err < 0) {
goto free;
} else if (nbytes > sz) {
err = -EINVAL;
goto free;
}
err = create_debugfs_mirror(bpmp, virt, nbytes, root);
free:
dma_free_coherent(bpmp->dev, sz, virt, phys);
out:
err = bpmp_populate_debugfs_shmem(bpmp, root);
if (err < 0)
debugfs_remove(root);
debugfs_remove_recursive(root);
return err;
}