Eliminate the call to follow_page. Instead, use the page
information that was kept during the proc_map call.
This also has the advantage that users can now only
specify memory areas that were previously mapped.
Signed-off-by: Ohad Ben-Cohen <ohad@xxxxxxxxxx>
---
If you want, you can also reach me at < ohadb at ti dot com >.
drivers/dsp/bridge/rmgr/proc.c | 143 ++++++++++++++++++++++++++--------------
1 files changed, 93 insertions(+), 50 deletions(-)
diff --git a/drivers/dsp/bridge/rmgr/proc.c b/drivers/dsp/bridge/rmgr/proc.c
index ebb11b1..bbc7e0f 100644
--- a/drivers/dsp/bridge/rmgr/proc.c
+++ b/drivers/dsp/bridge/rmgr/proc.c
@@ -209,6 +209,71 @@ out:
spin_unlock(&pr_obj->maps_lock);
}
+static int match_containing_map_info(struct memory_map_info *map_info,
+ u32 mpu_addr, u32 size)
+{
+ u32 map_info_end = map_info->mpu_addr + map_info->size;
+
+ return mpu_addr >= map_info->mpu_addr &&
+ mpu_addr + size <= map_info_end;
+}
+
+static struct memory_map_info *find_containing_mapping(
+ struct proc_object *pr_obj,
+ u32 mpu_addr, u32 size)
+{
+ struct memory_map_info *map_info;
+ struct list_head *iter;
+ pr_debug("%s: looking for mpu_addr 0x%x size 0x%x\n", __func__,
+ mpu_addr, size);
+
+ spin_lock(&pr_obj->maps_lock);
+ list_for_each(iter, &pr_obj->maps) {
+ map_info = list_entry(iter, struct memory_map_info, node);
+ pr_debug("%s: candidate: mpu_addr 0x%x virt 0x%x size 0x%x\n",
+ __func__,
+ map_info->mpu_addr,
+ map_info->dsp_addr,
+ map_info->size);
+ if (match_containing_map_info(map_info, mpu_addr, size)) {
+ pr_debug("%s: match!\n", __func__);
+ goto out;
+ }
+
+ pr_debug("%s: no match!\n", __func__);
+ }
+
+ map_info = NULL;
+out:
+ spin_unlock(&pr_obj->maps_lock);
+ return map_info;
+}
+
+static int find_first_page_in_cache(struct memory_map_info *map_info,
+ unsigned long mpu_addr)
+{
+ u32 mapped_base_page = map_info->mpu_addr >> PAGE_SHIFT;
+ u32 requested_base_page = mpu_addr >> PAGE_SHIFT;
+ int pg_index = requested_base_page - mapped_base_page;
+
+ if (pg_index < 0 || pg_index >= map_info->num_usr_pgs) {
+ pr_err("%s: failed (got %d)\n", __func__, pg_index);
+ return -1;
+ }
+
+ pr_debug("%s: first page is %d\n", __func__, pg_index);
+ return pg_index;
+}
+
+static inline struct page *get_mapping_page(struct memory_map_info *map_info,
+ int pg_i)
+{
+ if (pg_i < 0 || pg_i >= map_info->num_usr_pgs)
+ return NULL;
+
+ return map_info->pages[pg_i];
+}
+
/*
* ======== proc_attach ========
* Purpose:
@@ -561,23 +626,30 @@ dsp_status proc_enum_nodes(void *hprocessor, void **node_tab,
}
/* Cache operation against kernel address instead of users */
-static int memory_sync_page(struct vm_area_struct *vma, unsigned long start,
- ssize_t len, enum dsp_flushtype ftype)
+static int memory_sync_page(struct memory_map_info *map_info,
+ unsigned long start, ssize_t len, enum dsp_flushtype ftype)
{
struct page *page;
void *kaddr;
unsigned long offset;
ssize_t rest;
+ int pg_i;
+
+ pg_i = find_first_page_in_cache(map_info, start);
+ if (pg_i < 0) {
+ pr_err("%s: failed to find first page in cache\n", __func__);
+ return -EINVAL;
+ }
while (len) {
- page = follow_page(vma, start, FOLL_GET);
+ page = get_mapping_page(map_info, pg_i);
if (!page) {
pr_err("%s: no page for %08lx\n", __func__, start);
return -EINVAL;
} else if (IS_ERR(page)) {
pr_err("%s: err page for %08lx(%lu)\n", __func__, start,
- IS_ERR(page));
- return IS_ERR(page);
+ PTR_ERR(page));
+ return PTR_ERR(page);
}
offset = start & ~PAGE_MASK;
@@ -586,59 +658,22 @@ static int memory_sync_page(struct vm_area_struct *vma, unsigned long start,
mem_flush_cache(kaddr, rest, ftype);
kunmap(page);
- put_page(page);
len -= rest;
start += rest;
+ pg_i++;
}
return 0;
}
-/* Check if the given area blongs to process virtul memory address space */
-static int memory_sync_vma(unsigned long start, u32 len,
- enum dsp_flushtype ftype)
-{
- int err = 0;
- unsigned long end;
- struct vm_area_struct *vma;
-
- end = start + len;
- if (end <= start)
- return -EINVAL;
-
- while ((vma = find_vma(current->mm, start)) != NULL) {
- ssize_t size;
-
- if (vma->vm_flags & (VM_IO | VM_PFNMAP))
- return -EINVAL;
-
- if (vma->vm_start > start)
- return -EINVAL;
-
- size = min_t(ssize_t, vma->vm_end - start, len);
- err = memory_sync_page(vma, start, size, ftype);
- if (err)
- break;
-
- if (end <= vma->vm_end)
- break;
-
- start = vma->vm_end;
- }
-
- if (!vma)
- err = -EINVAL;
-
- return err;
-}
-
static dsp_status proc_memory_sync(void *hprocessor, void *pmpu_addr,
u32 ul_size, u32 ul_flags,
- enum dsp_flushtype FlushMemType)
+ enum dsp_flushtype ftype)
{
/* Keep STATUS here for future additions to this function */
dsp_status status = DSP_SOK;
struct proc_object *p_proc_object = (struct proc_object *)hprocessor;
+ struct memory_map_info *map_info;
DBC_REQUIRE(refs > 0);
@@ -647,18 +682,26 @@ static dsp_status proc_memory_sync(void *hprocessor, void *pmpu_addr,
goto err_out;
}
- down_read(¤t->mm->mmap_sem);
+ pr_debug("%s: addr 0x%x, size 0x%x, type %d\n", __func__,
+ (u32)pmpu_addr,
+ ul_size, ftype);
+
+ /* find requested memory are in cached mapping information */
+ map_info = find_containing_mapping(p_proc_object, (u32) pmpu_addr,
+ ul_size);
+ if (!map_info) {
+ pr_err("%s: find_containing_mapping failed\n", __func__);
+ status = DSP_EHANDLE;
+ goto err_out;
+ }
- if (memory_sync_vma((u32) pmpu_addr, ul_size, FlushMemType)) {
+ if (memory_sync_page(map_info, (u32) pmpu_addr, ul_size, ftype)) {
pr_err("%s: InValid address parameters %p %x\n",
__func__, pmpu_addr, ul_size);
status = DSP_EHANDLE;
}
- up_read(¤t->mm->mmap_sem);
-
err_out:
-
return status;
}
--
1.6.3.3
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
