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authorThierry Reding <treding@nvidia.com>2014-08-26 17:34:23 +0200
committerMarcel Ziswiler <marcel.ziswiler@toradex.com>2014-10-11 01:21:51 +0200
commit1a8f7ecda5a3b7100950f16b7be2288fe6b5c86f (patch)
tree22485962f3727af4b20bdbd4c821925452e6ea4b
parent7a14fa1f2911d618f4c7b0f91355236b7b38d982 (diff)
ARM: Implement non-cached memory support
Implement an API that can be used by drivers to allocate memory from a pool that is mapped uncached. This is useful if drivers would otherwise need to do extensive cache maintenance (or explicitly maintaining the cache isn't safe). The API is protected using the new CONFIG_SYS_NONCACHED_MEMORY setting. Boards can set this to the size to be used for the non-cached area. The area will typically be right below the malloc() area, but architectures should take care of aligning the beginning and end of the area to honor any mapping restrictions. Architectures must also ensure that mappings established for this area do not overlap with the malloc() area (which should remain cached for improved performance). While the API is currently only implemented for ARM v7, it should be generic enough to allow other architectures to implement it as well. Signed-off-by: Thierry Reding <treding@nvidia.com> Conflicts: README
-rw-r--r--README24
-rw-r--r--arch/arm/include/asm/system.h5
-rw-r--r--arch/arm/lib/cache.c42
-rw-r--r--common/board_r.c11
4 files changed, 82 insertions, 0 deletions
diff --git a/README b/README
index 46def0086b8..f5280408ad7 100644
--- a/README
+++ b/README
@@ -3868,6 +3868,30 @@ Configuration Settings:
Pre-relocation malloc() is only supported on ARM and sandbox
at present but is fairly easy to enable for other archs.
+- CONFIG_SYS_MALLOC_SIMPLE
+ Provides a simple and small malloc() and calloc() for those
+ boards which do not use the full malloc in SPL (which is
+ enabled with CONFIG_SYS_SPL_MALLOC_START).
+
+- CONFIG_SYS_NONCACHED_MEMORY:
+ Size of non-cached memory area. This area of memory will be
+ typically located right below the malloc() area and mapped
+ uncached in the MMU. This is useful for drivers that would
+ otherwise require a lot of explicit cache maintenance. For
+ some drivers it's also impossible to properly maintain the
+ cache. For example if the regions that need to be flushed
+ are not a multiple of the cache-line size, *and* padding
+ cannot be allocated between the regions to align them (i.e.
+ if the HW requires a contiguous array of regions, and the
+ size of each region is not cache-aligned), then a flush of
+ one region may result in overwriting data that hardware has
+ written to another region in the same cache-line. This can
+ happen for example in network drivers where descriptors for
+ buffers are typically smaller than the CPU cache-line (e.g.
+ 16 bytes vs. 32 or 64 bytes).
+
+ Non-cached memory is only supported on 32-bit ARM at present.
+
- CONFIG_SYS_BOOTM_LEN:
Normally compressed uImages are limited to an
uncompressed size of 8 MBytes. If this is not enough,
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 61e2914d44b..89f22946895 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -212,6 +212,11 @@ void mmu_set_region_dcache_behaviour(phys_addr_t start, size_t size,
*/
void mmu_page_table_flush(unsigned long start, unsigned long stop);
+#ifdef CONFIG_SYS_NONCACHED_MEMORY
+void noncached_init(void);
+phys_addr_t noncached_alloc(size_t size, size_t align);
+#endif /* CONFIG_SYS_NONCACHED_MEMORY */
+
#endif /* __ASSEMBLY__ */
#define arch_align_stack(x) (x)
diff --git a/arch/arm/lib/cache.c b/arch/arm/lib/cache.c
index 4e597a4c1d1..b2aa7740d4f 100644
--- a/arch/arm/lib/cache.c
+++ b/arch/arm/lib/cache.c
@@ -8,6 +8,7 @@
/* for now: just dummy functions to satisfy the linker */
#include <common.h>
+#include <malloc.h>
__weak void flush_cache(unsigned long start, unsigned long size)
{
@@ -49,3 +50,44 @@ __weak void enable_caches(void)
{
puts("WARNING: Caches not enabled\n");
}
+
+#ifdef CONFIG_SYS_NONCACHED_MEMORY
+/*
+ * Reserve one MMU section worth of address space below the malloc() area that
+ * will be mapped uncached.
+ */
+static unsigned long noncached_start;
+static unsigned long noncached_end;
+static unsigned long noncached_next;
+
+void noncached_init(void)
+{
+ phys_addr_t start, end;
+ size_t size;
+
+ end = ALIGN(mem_malloc_start, MMU_SECTION_SIZE) - MMU_SECTION_SIZE;
+ size = ALIGN(CONFIG_SYS_NONCACHED_MEMORY, MMU_SECTION_SIZE);
+ start = end - size;
+
+ debug("mapping memory %pa-%pa non-cached\n", &start, &end);
+
+ noncached_start = start;
+ noncached_end = end;
+ noncached_next = start;
+
+ mmu_set_region_dcache_behaviour(noncached_start, size, DCACHE_OFF);
+}
+
+phys_addr_t noncached_alloc(size_t size, size_t align)
+{
+ phys_addr_t next = ALIGN(noncached_next, align);
+
+ if (next >= noncached_end || (noncached_end - next) < size)
+ return 0;
+
+ debug("allocated %zu bytes of uncached memory @%pa\n", size, &next);
+ noncached_next = next + size;
+
+ return next;
+}
+#endif /* CONFIG_SYS_NONCACHED_MEMORY */
diff --git a/common/board_r.c b/common/board_r.c
index 231c6d67115..1fcfd8793ff 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -270,6 +270,14 @@ static int initr_malloc(void)
return 0;
}
+#ifdef CONFIG_SYS_NONCACHED_MEMORY
+static int initr_noncached(void)
+{
+ noncached_init();
+ return 0;
+}
+#endif
+
#ifdef CONFIG_DM
static int initr_dm(void)
{
@@ -719,6 +727,9 @@ init_fnc_t init_sequence_r[] = {
initr_reloc_global_data,
initr_barrier,
initr_malloc,
+#ifdef CONFIG_SYS_NONCACHED_MEMORY
+ initr_noncached,
+#endif
bootstage_relocate,
#ifdef CONFIG_DM
initr_dm,