[PATCH 26/30] amd64_edac: Improve DRAM address mapping

From: Borislav Petkov
Date: Thu Feb 10 2011 - 12:17:07 EST

From: Borislav Petkov <borislav.petkov@xxxxxxx>

Drop static tables which map the bits in F2x80 to a chip select size in
favor of functions doing the mapping with some bit fiddling. Also, add
F15 support.

Signed-off-by: Borislav Petkov <borislav.petkov@xxxxxxx>
---
drivers/edac/amd64_edac.c | 149 ++++++++++++++++++++++++--------------------
drivers/edac/amd64_edac.h | 4 +-
2 files changed, 83 insertions(+), 70 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index b85487d..eb6b6ba 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -25,59 +25,12 @@ static struct mem_ctl_info **mcis;
static struct ecc_settings **ecc_stngs;

/*
- * Address to DRAM bank mapping: see F2x80 for K8 and F2x[1,0]80 for Fam10 and
- * later.
- */
-static int ddr2_dbam_revCG[] = {
- [0] = 32,
- [1] = 64,
- [2] = 128,
- [3] = 256,
- [4] = 512,
- [5] = 1024,
- [6] = 2048,
-};
-
-static int ddr2_dbam_revD[] = {
- [0] = 32,
- [1] = 64,
- [2 ... 3] = 128,
- [4] = 256,
- [5] = 512,
- [6] = 256,
- [7] = 512,
- [8 ... 9] = 1024,
- [10] = 2048,
-};
-
-static int ddr2_dbam[] = { [0] = 128,
- [1] = 256,
- [2 ... 4] = 512,
- [5 ... 6] = 1024,
- [7 ... 8] = 2048,
- [9 ... 10] = 4096,
- [11] = 8192,
-};
-
-static int ddr3_dbam[] = { [0] = -1,
- [1] = 256,
- [2] = 512,
- [3 ... 4] = -1,
- [5 ... 6] = 1024,
- [7 ... 8] = 2048,
- [9 ... 10] = 4096,
- [11] = 8192,
-};
-
-/*
* Valid scrub rates for the K8 hardware memory scrubber. We map the scrubbing
* bandwidth to a valid bit pattern. The 'set' operation finds the 'matching-
* or higher value'.
*
*FIXME: Produce a better mapping/linearisation.
*/
-
-
struct scrubrate {
u32 scrubval; /* bit pattern for scrub rate */
u32 bandwidth; /* bandwidth consumed (bytes/sec) */
@@ -962,7 +915,7 @@ static int k8_early_channel_count(struct amd64_pvt *pvt)

if (pvt->ext_model >= K8_REV_F)
/* RevF (NPT) and later */
- flag = pvt->dclr0 & F10_WIDTH_128;
+ flag = pvt->dclr0 & WIDTH_128;
else
/* RevE and earlier */
flag = pvt->dclr0 & REVE_WIDTH_128;
@@ -1062,18 +1015,41 @@ static void k8_map_sysaddr_to_csrow(struct mem_ctl_info *mci, u64 sys_addr,
}
}

-static int k8_dbam_to_chip_select(struct amd64_pvt *pvt, int cs_mode)
+static int ddr2_cs_size(unsigned i, bool dct_width)
{
- int *dbam_map;
+ unsigned shift = 0;

- if (pvt->ext_model >= K8_REV_F)
- dbam_map = ddr2_dbam;
- else if (pvt->ext_model >= K8_REV_D)
- dbam_map = ddr2_dbam_revD;
+ if (i <= 2)
+ shift = i;
+ else if (!(i & 0x1))
+ shift = i >> 1;
else
- dbam_map = ddr2_dbam_revCG;
+ shift = (i + 1) >> 1;
+
+ return 128 << (shift + !!dct_width);
+}
+
+static int k8_dbam_to_chip_select(struct amd64_pvt *pvt, u8 dct,
+ unsigned cs_mode)
+{
+ u32 dclr = dct ? pvt->dclr1 : pvt->dclr0;
+
+ if (pvt->ext_model >= K8_REV_F) {
+ WARN_ON(cs_mode > 11);
+ return ddr2_cs_size(cs_mode, dclr & WIDTH_128);
+ }
+ else if (pvt->ext_model >= K8_REV_D) {
+ WARN_ON(cs_mode > 10);

- return dbam_map[cs_mode];
+ if (cs_mode == 3 || cs_mode == 8)
+ return 32 << (cs_mode - 1);
+ else
+ return 32 << cs_mode;
+ }
+ else {
+ WARN_ON(cs_mode > 6);
+ return 32 << cs_mode;
+ }
}

/*
@@ -1089,7 +1065,7 @@ static int f1x_early_channel_count(struct amd64_pvt *pvt)
int i, j, channels = 0;

/* On F10h, if we are in 128 bit mode, then we are using 2 channels */
- if (boot_cpu_data.x86 == 0x10 && (pvt->dclr0 & F10_WIDTH_128))
+ if (boot_cpu_data.x86 == 0x10 && (pvt->dclr0 & WIDTH_128))
return 2;

/*
@@ -1126,16 +1102,50 @@ static int f1x_early_channel_count(struct amd64_pvt *pvt)
return channels;
}

-static int f10_dbam_to_chip_select(struct amd64_pvt *pvt, int cs_mode)
+static int ddr3_cs_size(unsigned i, bool dct_width)
+{
+ unsigned shift = 0;
+ int cs_size = 0;
+
+ if (i == 0 || i == 3 || i == 4)
+ cs_size = -1;
+ else if (i <= 2)
+ shift = i;
+ else if (i == 12)
+ shift = 7;
+ else if (!(i & 0x1))
+ shift = i >> 1;
+ else
+ shift = (i + 1) >> 1;
+
+ if (cs_size != -1)
+ cs_size = (128 * (1 << !!dct_width)) << shift;
+
+ return cs_size;
+}
+
+static int f10_dbam_to_chip_select(struct amd64_pvt *pvt, u8 dct,
+ unsigned cs_mode)
{
- int *dbam_map;
+ u32 dclr = dct ? pvt->dclr1 : pvt->dclr0;
+
+ WARN_ON(cs_mode > 11);

if (pvt->dchr0 & DDR3_MODE || pvt->dchr1 & DDR3_MODE)
- dbam_map = ddr3_dbam;
+ return ddr3_cs_size(cs_mode, dclr & WIDTH_128);
else
- dbam_map = ddr2_dbam;
+ return ddr2_cs_size(cs_mode, dclr & WIDTH_128);
+}
+
+/*
+ * F15h supports only 64bit DCT interfaces
+ */
+static int f15_dbam_to_chip_select(struct amd64_pvt *pvt, u8 dct,
+ unsigned cs_mode)
+{
+ WARN_ON(cs_mode > 12);

- return dbam_map[cs_mode];
+ return ddr3_cs_size(cs_mode, false);
}

static void read_dram_ctl_register(struct amd64_pvt *pvt)
@@ -1528,7 +1538,7 @@ static void amd64_debug_display_dimm_sizes(int ctrl, struct amd64_pvt *pvt)
u32 dbam = ctrl ? pvt->dbam1 : pvt->dbam0;

if (boot_cpu_data.x86 == 0xf) {
- if (pvt->dclr0 & F10_WIDTH_128)
+ if (pvt->dclr0 & WIDTH_128)
factor = 1;

/* K8 families < revF not supported yet */
@@ -1551,11 +1561,13 @@ static void amd64_debug_display_dimm_sizes(int ctrl, struct amd64_pvt *pvt)

size0 = 0;
if (dcsb[dimm*2] & DCSB_CS_ENABLE)
- size0 = pvt->ops->dbam_to_cs(pvt, DBAM_DIMM(dimm, dbam));
+ size0 = pvt->ops->dbam_to_cs(pvt, ctrl,
+ DBAM_DIMM(dimm, dbam));

size1 = 0;
if (dcsb[dimm*2 + 1] & DCSB_CS_ENABLE)
- size1 = pvt->ops->dbam_to_cs(pvt, DBAM_DIMM(dimm, dbam));
+ size1 = pvt->ops->dbam_to_cs(pvt, ctrl,
+ DBAM_DIMM(dimm, dbam));

amd64_info(EDAC_MC ": %d: %5dMB %d: %5dMB\n",
dimm * 2, size0 << factor,
@@ -1591,6 +1603,7 @@ static struct amd64_family_type amd64_family_types[] = {
.ops = {
.early_channel_count = f1x_early_channel_count,
.map_sysaddr_to_csrow = f1x_map_sysaddr_to_csrow,
+ .dbam_to_cs = f15_dbam_to_chip_select,
.read_dct_pci_cfg = f15_read_dct_pci_cfg,
}
},
@@ -2030,7 +2043,7 @@ static void read_mc_regs(struct amd64_pvt *pvt)
* encompasses
*
*/
-static u32 amd64_csrow_nr_pages(int csrow_nr, struct amd64_pvt *pvt)
+static u32 amd64_csrow_nr_pages(struct amd64_pvt *pvt, u8 dct, int csrow_nr)
{
u32 cs_mode, nr_pages;

@@ -2043,7 +2056,7 @@ static u32 amd64_csrow_nr_pages(int csrow_nr, struct amd64_pvt *pvt)
*/
cs_mode = (pvt->dbam0 >> ((csrow_nr / 2) * 4)) & 0xF;

- nr_pages = pvt->ops->dbam_to_cs(pvt, cs_mode) << (20 - PAGE_SHIFT);
+ nr_pages = pvt->ops->dbam_to_cs(pvt, dct, cs_mode) << (20 - PAGE_SHIFT);

/*
* If dual channel then double the memory size of single channel.
@@ -2091,7 +2104,7 @@ static int init_csrows(struct mem_ctl_info *mci)
i, pvt->mc_node_id);

empty = 0;
- csrow->nr_pages = amd64_csrow_nr_pages(i, pvt);
+ csrow->nr_pages = amd64_csrow_nr_pages(pvt, 0, i);
find_csrow_limits(mci, i, &input_addr_min, &input_addr_max);
sys_addr = input_addr_to_sys_addr(mci, input_addr_min);
csrow->first_page = (u32) (sys_addr >> PAGE_SHIFT);
diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
index e14a8d0..8e431ab 100644
--- a/drivers/edac/amd64_edac.h
+++ b/drivers/edac/amd64_edac.h
@@ -221,7 +221,7 @@
#define DCLR0 0x90
#define DCLR1 0x190
#define REVE_WIDTH_128 BIT(16)
-#define F10_WIDTH_128 BIT(11)
+#define WIDTH_128 BIT(11)

#define DCHR0 0x94
#define DCHR1 0x194
@@ -445,7 +445,7 @@ struct low_ops {
int (*early_channel_count) (struct amd64_pvt *pvt);
void (*map_sysaddr_to_csrow) (struct mem_ctl_info *mci, u64 sys_addr,
u16 syndrome);
- int (*dbam_to_cs) (struct amd64_pvt *pvt, int cs_mode);
+ int (*dbam_to_cs) (struct amd64_pvt *pvt, u8 dct, unsigned cs_mode);
int (*read_dct_pci_cfg) (struct amd64_pvt *pvt, int offset,
u32 *val, const char *func);
};
--
1.7.4.rc2

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