Signed-off-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Reviewed-by: Omar Ramirez Luna <omar.rami...@ti.com>
---
drivers/staging/tidspbridge/core/tiomap3430.c | 148 +++++++++++-------------
1 files changed, 68 insertions(+), 80 deletions(-)
diff --git a/drivers/staging/tidspbridge/core/tiomap3430.c
b/drivers/staging/tidspbridge/core/tiomap3430.c
index 7f1372e..7d074fc 100644
--- a/drivers/staging/tidspbridge/core/tiomap3430.c
+++ b/drivers/staging/tidspbridge/core/tiomap3430.c
@@ -1079,47 +1079,46 @@ static int pte_set(struct pg_table_attrs *pt, u32 pa,
u32 va,
return status;
}
+static unsigned max_alignment(u32 addr, u32 size)
+{
+ unsigned pagesize[] = { SZ_16M, SZ_1M, SZ_64K, SZ_4K, };
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(pagesize); i++) {
+ if ((addr & (pagesize[i] - 1)) == 0 && size >= pagesize[i])
+ return pagesize[i];
+ }
+
+ return 0;
+}
+
/*
* ======== pte_update ========
* This function calculates the optimum page-aligned addresses and sizes
* Caller must pass page-aligned values
*/
-static int pte_update(struct bridge_dev_context *dev_ctxt, u32 pa,
- u32 va, u32 size,
- struct hw_mmu_map_attrs_t *map_attrs)
+static int pte_update(struct bridge_dev_context *dev_ctxt, u32 pa, u32 va,
+ u32 size, struct hw_mmu_map_attrs_t *map_attrs)
{
- u32 i;
- u32 all_bits;
- u32 pa_curr = pa;
- u32 va_curr = va;
- u32 num_bytes = size;
- int status = 0;
- u32 page_size[] = { SZ_16M, SZ_1M, SZ_64K, SZ_4K };
-
- while (num_bytes && !status) {
+ while (size) {
/* To find the max. page size with which both PA & VA are
* aligned */
- all_bits = pa_curr | va_curr;
+ unsigned int ent_sz = max_alignment(va | pa, size);
+ int ret;
- for (i = 0; i < 4; i++) {
- if ((num_bytes >= page_size[i]) && ((all_bits &
- (page_size[i] -
- 1)) == 0)) {
- status =
- pte_set(dev_ctxt->pt_attrs, pa_curr,
- va_curr, page_size[i], map_attrs);
- pa_curr += page_size[i];
- va_curr += page_size[i];
- num_bytes -= page_size[i];
- /* Don't try smaller sizes. Hopefully we have
- * reached an address aligned to a bigger page
- * size */
- break;
- }
- }
+ if (WARN_ON(ent_sz == 0))
+ return -EINVAL;
+
+ ret = pte_set(dev_ctxt->pt_attrs, pa, va, ent_sz, map_attrs);
+ if (ret < 0)
+ return ret;
+
+ pa += ent_sz;
+ va += ent_sz;
+ size -= ent_sz;
}
- return status;
+ return 0;
}
/*
@@ -1167,70 +1166,58 @@ static inline void flush_all(struct bridge_dev_context
*dev_ctxt)
}
/* Memory map kernel VA -- memory allocated with vmalloc */
-static int mem_map_vmalloc(struct bridge_dev_context *dev_ctxt,
- u32 mpu_addr, u32 virt_addr, u32 num_bytes,
+static int mem_map_vmalloc(struct bridge_dev_context *dev_ctxt, u32 mpu_addr,
+ u32 virt_addr, size_t num_bytes,
struct hw_mmu_map_attrs_t *hw_attrs)
{
- int status = 0;
- struct page *page[1];
- u32 i;
- u32 pa_curr;
- u32 pa_next;
- u32 va_curr;
- u32 size_curr;
- u32 num_pages;
- u32 pa;
- u32 num_of4k_pages;
- u32 temp = 0;
+ struct page *page_next;
+ int ret;
/*
* Do Kernel va to pa translation.
* Combine physically contiguous regions to reduce TLBs.
* Pass the translated pa to pte_update.
*/
- num_pages = num_bytes / PAGE_SIZE; /* PAGE_SIZE = OS page size */
- i = 0;
- va_curr = mpu_addr;
- page[0] = vmalloc_to_page((void *)va_curr);
- pa_next = page_to_phys(page[0]);
- while (!status && (i < num_pages)) {
- /*
- * Reuse pa_next from the previous iteraion to avoid
- * an extra va2pa call
- */
- pa_curr = pa_next;
- size_curr = PAGE_SIZE;
+ page_next = vmalloc_to_page((void *)mpu_addr);
+
+ while (num_bytes > 0) {
+ struct page *page = page_next;
+ size_t chunk_size = PAGE_SIZE;
+ u32 num_pages = 1;
+
+ get_page(page);
+
/*
- * If the next page is physically contiguous,
- * map it with the current one by increasing
- * the size of the region to be mapped
+ * If the next page is physically contiguous, map it with the
+ * current one by increasing the size of the region to be
mapped.
*/
- while (++i < num_pages) {
- page[0] =
- vmalloc_to_page((void *)(va_curr + size_curr));
- pa_next = page_to_phys(page[0]);
-
- if (pa_next == (pa_curr + size_curr))
- size_curr += PAGE_SIZE;
- else
+ while (chunk_size < num_bytes) {
+ page_next =
+ vmalloc_to_page((void *)mpu_addr + chunk_size);
+ if (page_next != page + num_pages)
break;
+ chunk_size += PAGE_SIZE;
+ num_pages++;
+
+ get_page(page_next);
}
- if (pa_next == 0) {
- status = -ENOMEM;
+
+ if (page_next == NULL) {
+ ret = -ENOMEM;
break;
}
- pa = pa_curr;
- num_of4k_pages = size_curr / SZ_4K;
- while (temp++ < num_of4k_pages) {
- get_page(PHYS_TO_PAGE(pa));
- pa += SZ_4K;
- }
- status = pte_update(dev_ctxt, pa_curr, virt_addr +
- (va_curr - mpu_addr), size_curr,
- hw_attrs);
- va_curr += size_curr;
+
+ ret = pte_update(dev_ctxt, page_to_phys(page), virt_addr,
+ chunk_size, hw_attrs);
+ if (ret)
+ break;
+
+ mpu_addr += chunk_size;
+ virt_addr += chunk_size;
+ num_bytes -= chunk_size;
}
+
/*
* In any case, flush the TLB
* This is called from here instead from pte_update to avoid unnecessary
@@ -1238,8 +1225,9 @@ static int mem_map_vmalloc(struct bridge_dev_context
*dev_ctxt,
* region
*/
flush_all(dev_ctxt);
- dev_dbg(bridge, "%s status %x\n", __func__, status);
- return status;
+ dev_dbg(bridge, "%s status %d\n", __func__, ret);
+
+ return ret;
}
static void bad_page_dump(u32 pa, struct page *pg)
--
1.7.8.6
--
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