msm: kgsl: Support user-specified caching hints
The user allocating memory can provide hints for the caching
settings when said buffer is mapped on the user side. Try
to obey the cache settings when applicable. The user will
be responsible for handling cache management both to and
from the GPU so add a new ioctl IOCTL_KGSL_GPUMEM_CACHE_SYNC to
support both directions (the old IOCTL_KGSL_SHAREDMEM_FLUSH_CACHE)
only handled flushing, not invalidating. The legacy ioctl still
works it just does what it says it does - a cache flush.
Change-Id: Ic0dedbad55ce82f2b01ebc56de30d4649e2e7311
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
diff --git a/drivers/gpu/msm/kgsl_debugfs.c b/drivers/gpu/msm/kgsl_debugfs.c
index d16ceb2..ab3c478 100644
--- a/drivers/gpu/msm/kgsl_debugfs.c
+++ b/drivers/gpu/msm/kgsl_debugfs.c
@@ -198,12 +198,23 @@
return '-';
}
+static char get_cacheflag(const struct kgsl_memdesc *m)
+{
+ static const char table[] = {
+ [KGSL_CACHEMODE_WRITECOMBINE] = '-',
+ [KGSL_CACHEMODE_UNCACHED] = 'u',
+ [KGSL_CACHEMODE_WRITEBACK] = 'b',
+ [KGSL_CACHEMODE_WRITETHROUGH] = 't',
+ };
+ return table[kgsl_memdesc_get_cachemode(m)];
+}
+
static int process_mem_print(struct seq_file *s, void *unused)
{
struct kgsl_mem_entry *entry;
struct rb_node *node;
struct kgsl_process_private *private = s->private;
- char flags[4];
+ char flags[5];
char usage[16];
spin_lock(&private->mem_lock);
@@ -218,7 +229,8 @@
flags[0] = kgsl_memdesc_is_global(m) ? 'g' : '-';
flags[1] = m->flags & KGSL_MEMFLAGS_GPUREADONLY ? 'r' : '-';
flags[2] = get_alignflag(m);
- flags[3] = '\0';
+ flags[3] = get_cacheflag(m);
+ flags[4] = '\0';
kgsl_get_memory_usage(usage, sizeof(usage), m->flags);