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authorLinus Torvalds <torvalds@linux-foundation.org>2017-05-09 10:10:15 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-09 10:10:15 -0700
commit4a1e31c68e9f40be32838944931178b0d9ed9162 (patch)
tree98b2cd1280ec759543a07a9517db04706ebf5de5 /arch/arc/mm
parentc6778ff813d2ca3e3c8733c87dc8b6831a64578b (diff)
parentcf4100d1cddcd243f80ac2af2e4c4273919ff225 (diff)
downloadlinux-4a1e31c68e9f40be32838944931178b0d9ed9162.tar.gz
Merge tag 'arc-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
Pull ARC updates from Vineet Gupta: - AXS10x platform clk updates for I2S, PGU - add region based cache flush operation for ARCv2 cores - enforce PAE40 dependency on HIGHMEM - ptrace support for additional regs in ARCv2 cores - fix build failure in linux-next dut to a header include ordering change * tag 'arc-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: Revert "ARCv2: Allow enabling PAE40 w/o HIGHMEM" ARC: mm: fix build failure in linux-next for UP builds ARCv2: ptrace: provide regset for accumulator/r30 regs elf: Add ARCv2 specific core note section ARCv2: mm: micro-optimize region flush generated code ARCv2: mm: Merge 2 updates to DC_CTRL for region flush ARCv2: mm: Implement cache region flush operations ARC: mm: Move full_page computation into cache version agnostic wrapper arc: axs10x: Fix ARC PGU default clock frequency arc: axs10x: Add DT bindings for I2S audio playback
Diffstat (limited to 'arch/arc/mm')
-rw-r--r--arch/arc/mm/cache.c111
1 files changed, 98 insertions, 13 deletions
diff --git a/arch/arc/mm/cache.c b/arch/arc/mm/cache.c
index 928562967f3c..a867575a758b 100644
--- a/arch/arc/mm/cache.c
+++ b/arch/arc/mm/cache.c
@@ -21,6 +21,10 @@
#include <asm/cachectl.h>
#include <asm/setup.h>
+#ifdef CONFIG_ISA_ARCV2
+#define USE_RGN_FLSH 1
+#endif
+
static int l2_line_sz;
static int ioc_exists;
int slc_enable = 1, ioc_enable = 1;
@@ -28,7 +32,7 @@ unsigned long perip_base = ARC_UNCACHED_ADDR_SPACE; /* legacy value for boot */
unsigned long perip_end = 0xFFFFFFFF; /* legacy value */
void (*_cache_line_loop_ic_fn)(phys_addr_t paddr, unsigned long vaddr,
- unsigned long sz, const int cacheop);
+ unsigned long sz, const int op, const int full_page);
void (*__dma_cache_wback_inv)(phys_addr_t start, unsigned long sz);
void (*__dma_cache_inv)(phys_addr_t start, unsigned long sz);
@@ -233,11 +237,10 @@ slc_chk:
static inline
void __cache_line_loop_v2(phys_addr_t paddr, unsigned long vaddr,
- unsigned long sz, const int op)
+ unsigned long sz, const int op, const int full_page)
{
unsigned int aux_cmd;
int num_lines;
- const int full_page = __builtin_constant_p(sz) && sz == PAGE_SIZE;
if (op == OP_INV_IC) {
aux_cmd = ARC_REG_IC_IVIL;
@@ -279,11 +282,10 @@ void __cache_line_loop_v2(phys_addr_t paddr, unsigned long vaddr,
*/
static inline
void __cache_line_loop_v3(phys_addr_t paddr, unsigned long vaddr,
- unsigned long sz, const int op)
+ unsigned long sz, const int op, const int full_page)
{
unsigned int aux_cmd, aux_tag;
int num_lines;
- const int full_page = __builtin_constant_p(sz) && sz == PAGE_SIZE;
if (op == OP_INV_IC) {
aux_cmd = ARC_REG_IC_IVIL;
@@ -334,6 +336,8 @@ void __cache_line_loop_v3(phys_addr_t paddr, unsigned long vaddr,
}
}
+#ifndef USE_RGN_FLSH
+
/*
* In HS38x (MMU v4), I-cache is VIPT (can alias), D-cache is PIPT
* Here's how cache ops are implemented
@@ -349,17 +353,16 @@ void __cache_line_loop_v3(phys_addr_t paddr, unsigned long vaddr,
*/
static inline
void __cache_line_loop_v4(phys_addr_t paddr, unsigned long vaddr,
- unsigned long sz, const int cacheop)
+ unsigned long sz, const int op, const int full_page)
{
unsigned int aux_cmd;
int num_lines;
- const int full_page_op = __builtin_constant_p(sz) && sz == PAGE_SIZE;
- if (cacheop == OP_INV_IC) {
+ if (op == OP_INV_IC) {
aux_cmd = ARC_REG_IC_IVIL;
} else {
/* d$ cmd: INV (discard or wback-n-discard) OR FLUSH (wback) */
- aux_cmd = cacheop & OP_INV ? ARC_REG_DC_IVDL : ARC_REG_DC_FLDL;
+ aux_cmd = op & OP_INV ? ARC_REG_DC_IVDL : ARC_REG_DC_FLDL;
}
/* Ensure we properly floor/ceil the non-line aligned/sized requests
@@ -368,7 +371,7 @@ void __cache_line_loop_v4(phys_addr_t paddr, unsigned long vaddr,
* -@paddr will be cache-line aligned already (being page aligned)
* -@sz will be integral multiple of line size (being page sized).
*/
- if (!full_page_op) {
+ if (!full_page) {
sz += paddr & ~CACHE_LINE_MASK;
paddr &= CACHE_LINE_MASK;
}
@@ -381,7 +384,7 @@ void __cache_line_loop_v4(phys_addr_t paddr, unsigned long vaddr,
* - (and needs to be written before the lower 32 bits)
*/
if (is_pae40_enabled()) {
- if (cacheop == OP_INV_IC)
+ if (op == OP_INV_IC)
/*
* Non aliasing I-cache in HS38,
* aliasing I-cache handled in __cache_line_loop_v3()
@@ -397,6 +400,55 @@ void __cache_line_loop_v4(phys_addr_t paddr, unsigned long vaddr,
}
}
+#else
+
+/*
+ * optimized flush operation which takes a region as opposed to iterating per line
+ */
+static inline
+void __cache_line_loop_v4(phys_addr_t paddr, unsigned long vaddr,
+ unsigned long sz, const int op, const int full_page)
+{
+ unsigned int s, e;
+
+ /* Only for Non aliasing I-cache in HS38 */
+ if (op == OP_INV_IC) {
+ s = ARC_REG_IC_IVIR;
+ e = ARC_REG_IC_ENDR;
+ } else {
+ s = ARC_REG_DC_STARTR;
+ e = ARC_REG_DC_ENDR;
+ }
+
+ if (!full_page) {
+ /* for any leading gap between @paddr and start of cache line */
+ sz += paddr & ~CACHE_LINE_MASK;
+ paddr &= CACHE_LINE_MASK;
+
+ /*
+ * account for any trailing gap to end of cache line
+ * this is equivalent to DIV_ROUND_UP() in line ops above
+ */
+ sz += L1_CACHE_BYTES - 1;
+ }
+
+ if (is_pae40_enabled()) {
+ /* TBD: check if crossing 4TB boundary */
+ if (op == OP_INV_IC)
+ write_aux_reg(ARC_REG_IC_PTAG_HI, (u64)paddr >> 32);
+ else
+ write_aux_reg(ARC_REG_DC_PTAG_HI, (u64)paddr >> 32);
+ }
+
+ /* ENDR needs to be set ahead of START */
+ write_aux_reg(e, paddr + sz); /* ENDR is exclusive */
+ write_aux_reg(s, paddr);
+
+ /* caller waits on DC_CTRL.FS */
+}
+
+#endif
+
#if (CONFIG_ARC_MMU_VER < 3)
#define __cache_line_loop __cache_line_loop_v2
#elif (CONFIG_ARC_MMU_VER == 3)
@@ -411,6 +463,11 @@ void __cache_line_loop_v4(phys_addr_t paddr, unsigned long vaddr,
* Machine specific helpers for Entire D-Cache or Per Line ops
*/
+#ifndef USE_RGN_FLSH
+/*
+ * this version avoids extra read/write of DC_CTRL for flush or invalid ops
+ * in the non region flush regime (such as for ARCompact)
+ */
static inline void __before_dc_op(const int op)
{
if (op == OP_FLUSH_N_INV) {
@@ -424,6 +481,32 @@ static inline void __before_dc_op(const int op)
}
}
+#else
+
+static inline void __before_dc_op(const int op)
+{
+ const unsigned int ctl = ARC_REG_DC_CTRL;
+ unsigned int val = read_aux_reg(ctl);
+
+ if (op == OP_FLUSH_N_INV) {
+ val |= DC_CTRL_INV_MODE_FLUSH;
+ }
+
+ if (op != OP_INV_IC) {
+ /*
+ * Flush / Invalidate is provided by DC_CTRL.RNG_OP 0 or 1
+ * combined Flush-n-invalidate uses DC_CTRL.IM = 1 set above
+ */
+ val &= ~DC_CTRL_RGN_OP_MSK;
+ if (op & OP_INV)
+ val |= DC_CTRL_RGN_OP_INV;
+ }
+ write_aux_reg(ctl, val);
+}
+
+#endif
+
+
static inline void __after_dc_op(const int op)
{
if (op & OP_FLUSH) {
@@ -486,13 +569,14 @@ static void __dc_enable(void)
static inline void __dc_line_op(phys_addr_t paddr, unsigned long vaddr,
unsigned long sz, const int op)
{
+ const int full_page = __builtin_constant_p(sz) && sz == PAGE_SIZE;
unsigned long flags;
local_irq_save(flags);
__before_dc_op(op);
- __cache_line_loop(paddr, vaddr, sz, op);
+ __cache_line_loop(paddr, vaddr, sz, op, full_page);
__after_dc_op(op);
@@ -521,10 +605,11 @@ static inline void
__ic_line_inv_vaddr_local(phys_addr_t paddr, unsigned long vaddr,
unsigned long sz)
{
+ const int full_page = __builtin_constant_p(sz) && sz == PAGE_SIZE;
unsigned long flags;
local_irq_save(flags);
- (*_cache_line_loop_ic_fn)(paddr, vaddr, sz, OP_INV_IC);
+ (*_cache_line_loop_ic_fn)(paddr, vaddr, sz, OP_INV_IC, full_page);
local_irq_restore(flags);
}