aboutsummaryrefslogtreecommitdiff
path: root/arch/arc
diff options
context:
space:
mode:
authorVineet Gupta <vgupta@synopsys.com>2014-06-27 15:49:47 +0530
committerVineet Gupta <vgupta@synopsys.com>2014-07-23 11:22:10 +0530
commitda40ff48bda631b2530e561d5cc0663baae8d7de (patch)
tree9cfb7f231b1fd6d1cf0e62d91ed92a49564ca727 /arch/arc
parent590892deb650fa152698f0a2f4eba44789e51c38 (diff)
downloadlinux-da40ff48bda631b2530e561d5cc0663baae8d7de.tar.gz
ARC: cache boot reporting updates
* print aliasing or not, VIPT/PIPT etc * compress param storage using bitfields * more use of IS_ENABLED to de-uglify code Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc')
-rw-r--r--arch/arc/include/asm/arcregs.h2
-rw-r--r--arch/arc/mm/cache_arc700.c61
2 files changed, 37 insertions, 26 deletions
diff --git a/arch/arc/include/asm/arcregs.h b/arch/arc/include/asm/arcregs.h
index 355cb470c2a..372466b371b 100644
--- a/arch/arc/include/asm/arcregs.h
+++ b/arch/arc/include/asm/arcregs.h
@@ -296,7 +296,7 @@ struct cpuinfo_arc_mmu {
};
struct cpuinfo_arc_cache {
- unsigned int sz, line_len, assoc, ver;
+ unsigned int sz_k:8, line_len:8, assoc:4, ver:4, alias:1, vipt:1, pad:6;
};
struct cpuinfo_arc_ccm {
diff --git a/arch/arc/mm/cache_arc700.c b/arch/arc/mm/cache_arc700.c
index 353b202c37c..8070928e89d 100644
--- a/arch/arc/mm/cache_arc700.c
+++ b/arch/arc/mm/cache_arc700.c
@@ -77,21 +77,19 @@ char *arc_cache_mumbojumbo(int c, char *buf, int len)
{
int n = 0;
-#define PR_CACHE(p, enb, str) \
-{ \
+#define PR_CACHE(p, cfg, str) \
if (!(p)->ver) \
n += scnprintf(buf + n, len - n, str"\t\t: N/A\n"); \
else \
n += scnprintf(buf + n, len - n, \
- str"\t\t: (%uK) VIPT, %dway set-asc, %ub Line %s\n", \
- TO_KB((p)->sz), (p)->assoc, (p)->line_len, \
- enb ? "" : "DISABLED (kernel-build)"); \
-}
+ str"\t\t: %uK, %dway/set, %uB Line, %s%s%s\n", \
+ (p)->sz_k, (p)->assoc, (p)->line_len, \
+ (p)->vipt ? "VIPT" : "PIPT", \
+ (p)->alias ? " aliasing" : "", \
+ IS_ENABLED(cfg) ? "" : " (not used)");
- PR_CACHE(&cpuinfo_arc700[c].icache, IS_ENABLED(CONFIG_ARC_HAS_ICACHE),
- "I-Cache");
- PR_CACHE(&cpuinfo_arc700[c].dcache, IS_ENABLED(CONFIG_ARC_HAS_DCACHE),
- "D-Cache");
+ PR_CACHE(&cpuinfo_arc700[c].icache, CONFIG_ARC_HAS_ICACHE, "I-Cache");
+ PR_CACHE(&cpuinfo_arc700[c].dcache, CONFIG_ARC_HAS_DCACHE, "D-Cache");
return buf;
}
@@ -116,20 +114,31 @@ void read_decode_cache_bcr(void)
p_ic = &cpuinfo_arc700[cpu].icache;
READ_BCR(ARC_REG_IC_BCR, ibcr);
+ if (!ibcr.ver)
+ goto dc_chk;
+
BUG_ON(ibcr.config != 3);
p_ic->assoc = 2; /* Fixed to 2w set assoc */
p_ic->line_len = 8 << ibcr.line_len;
- p_ic->sz = 0x200 << ibcr.sz;
+ p_ic->sz_k = 1 << (ibcr.sz - 1);
p_ic->ver = ibcr.ver;
+ p_ic->vipt = 1;
+ p_ic->alias = p_ic->sz_k/p_ic->assoc/TO_KB(PAGE_SIZE) > 1;
+dc_chk:
p_dc = &cpuinfo_arc700[cpu].dcache;
READ_BCR(ARC_REG_DC_BCR, dbcr);
+ if (!dbcr.ver)
+ return;
+
BUG_ON(dbcr.config != 2);
p_dc->assoc = 4; /* Fixed to 4w set assoc */
p_dc->line_len = 16 << dbcr.line_len;
- p_dc->sz = 0x200 << dbcr.sz;
+ p_dc->sz_k = 1 << (dbcr.sz - 1);
p_dc->ver = dbcr.ver;
+ p_dc->vipt = 1;
+ p_dc->alias = p_dc->sz_k/p_dc->assoc/TO_KB(PAGE_SIZE) > 1;
}
/*
@@ -142,14 +151,16 @@ void read_decode_cache_bcr(void)
void arc_cache_init(void)
{
unsigned int __maybe_unused cpu = smp_processor_id();
- struct cpuinfo_arc_cache __maybe_unused *ic, __maybe_unused *dc;
char str[256];
printk(arc_cache_mumbojumbo(0, str, sizeof(str)));
-#ifdef CONFIG_ARC_HAS_ICACHE
- ic = &cpuinfo_arc700[cpu].icache;
- if (ic->ver) {
+ if (IS_ENABLED(CONFIG_ARC_HAS_ICACHE)) {
+ struct cpuinfo_arc_cache *ic = &cpuinfo_arc700[cpu].icache;
+
+ if (!ic->ver)
+ panic("cache support enabled but non-existent cache\n");
+
if (ic->line_len != L1_CACHE_BYTES)
panic("ICache line [%d] != kernel Config [%d]",
ic->line_len, L1_CACHE_BYTES);
@@ -158,26 +169,26 @@ void arc_cache_init(void)
panic("Cache ver [%d] doesn't match MMU ver [%d]\n",
ic->ver, CONFIG_ARC_MMU_VER);
}
-#endif
-#ifdef CONFIG_ARC_HAS_DCACHE
- dc = &cpuinfo_arc700[cpu].dcache;
- if (dc->ver) {
- unsigned int dcache_does_alias;
+ if (IS_ENABLED(CONFIG_ARC_HAS_DCACHE)) {
+ struct cpuinfo_arc_cache *dc = &cpuinfo_arc700[cpu].dcache;
+ int handled;
+
+ if (!dc->ver)
+ panic("cache support enabled but non-existent cache\n");
if (dc->line_len != L1_CACHE_BYTES)
panic("DCache line [%d] != kernel Config [%d]",
dc->line_len, L1_CACHE_BYTES);
/* check for D-Cache aliasing */
- dcache_does_alias = (dc->sz / dc->assoc) > PAGE_SIZE;
+ handled = IS_ENABLED(CONFIG_ARC_CACHE_VIPT_ALIASING);
- if (dcache_does_alias && !cache_is_vipt_aliasing())
+ if (dc->alias && !handled)
panic("Enable CONFIG_ARC_CACHE_VIPT_ALIASING\n");
- else if (!dcache_does_alias && cache_is_vipt_aliasing())
+ else if (!dc->alias && handled)
panic("Don't need CONFIG_ARC_CACHE_VIPT_ALIASING\n");
}
-#endif
}
#define OP_INV 0x1