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amd64_edac: add DRAM address type conversion facilities 

Borislav:

- cleanup/fix comments, add BKDG refs
- fix function return value patterns
- cleanup dbg calls

Reviewed-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Doug Thompson <dougthompson@xmission.com>
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
hifive-unleashed-5.1
Doug Thompson 2009-05-04 20:46:50 +02:00 committed by Borislav Petkov
parent e2ce7255e8
commit 93c2df58b5
1 changed files with 294 additions and 0 deletions
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294
drivers/edac/amd64_edac.c
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@ -434,4 +434,298 @@ int amd64_get_dram_hole_info(struct mem_ctl_info *mci, u64 *hole_base,
}
EXPORT_SYMBOL_GPL(amd64_get_dram_hole_info);
/*
* Return the DramAddr that the SysAddr given by @sys_addr maps to. It is
* assumed that sys_addr maps to the node given by mci.
*
* The first part of section 3.4.4 (p. 70) shows how the DRAM Base (section
* 3.4.4.1) and DRAM Limit (section 3.4.4.2) registers are used to translate a
* SysAddr to a DramAddr. If the DRAM Hole Address Register (DHAR) is enabled,
* then it is also involved in translating a SysAddr to a DramAddr. Sections
* 3.4.8 and 3.5.8.2 describe the DHAR and how it is used for memory hoisting.
* These parts of the documentation are unclear. I interpret them as follows:
*
* When node n receives a SysAddr, it processes the SysAddr as follows:
*
* 1. It extracts the DRAMBase and DRAMLimit values from the DRAM Base and DRAM
* Limit registers for node n. If the SysAddr is not within the range
* specified by the base and limit values, then node n ignores the Sysaddr
* (since it does not map to node n). Otherwise continue to step 2 below.
*
* 2. If the DramHoleValid bit of the DHAR for node n is clear, the DHAR is
* disabled so skip to step 3 below. Otherwise see if the SysAddr is within
* the range of relocated addresses (starting at 0x100000000) from the DRAM
* hole. If not, skip to step 3 below. Else get the value of the
* DramHoleOffset field from the DHAR. To obtain the DramAddr, subtract the
* offset defined by this value from the SysAddr.
*
* 3. Obtain the base address for node n from the DRAMBase field of the DRAM
* Base register for node n. To obtain the DramAddr, subtract the base
* address from the SysAddr, as shown near the start of section 3.4.4 (p.70).
*/
static u64 sys_addr_to_dram_addr(struct mem_ctl_info *mci, u64 sys_addr)
{
u64 dram_base, hole_base, hole_offset, hole_size, dram_addr;
int ret = 0;
dram_base = get_dram_base(mci);
ret = amd64_get_dram_hole_info(mci, &hole_base, &hole_offset,
&hole_size);
if (!ret) {
if ((sys_addr >= (1ull << 32)) &&
(sys_addr < ((1ull << 32) + hole_size))) {
/* use DHAR to translate SysAddr to DramAddr */
dram_addr = sys_addr - hole_offset;
debugf2("using DHAR to translate SysAddr 0x%lx to "
"DramAddr 0x%lx\n",
(unsigned long)sys_addr,
(unsigned long)dram_addr);
return dram_addr;
}
}
/*
* Translate the SysAddr to a DramAddr as shown near the start of
* section 3.4.4 (p. 70). Although sys_addr is a 64-bit value, the k8
* only deals with 40-bit values. Therefore we discard bits 63-40 of
* sys_addr below. If bit 39 of sys_addr is 1 then the bits we
* discard are all 1s. Otherwise the bits we discard are all 0s. See
* section 3.4.2 of AMD publication 24592: AMD x86-64 Architecture
* Programmer's Manual Volume 1 Application Programming.
*/
dram_addr = (sys_addr & 0xffffffffffull) - dram_base;
debugf2("using DRAM Base register to translate SysAddr 0x%lx to "
"DramAddr 0x%lx\n", (unsigned long)sys_addr,
(unsigned long)dram_addr);
return dram_addr;
}
/*
* @intlv_en is the value of the IntlvEn field from a DRAM Base register
* (section 3.4.4.1). Return the number of bits from a SysAddr that are used
* for node interleaving.
*/
static int num_node_interleave_bits(unsigned intlv_en)
{
static const int intlv_shift_table[] = { 0, 1, 0, 2, 0, 0, 0, 3 };
int n;
BUG_ON(intlv_en > 7);
n = intlv_shift_table[intlv_en];
return n;
}
/* Translate the DramAddr given by @dram_addr to an InputAddr. */
static u64 dram_addr_to_input_addr(struct mem_ctl_info *mci, u64 dram_addr)
{
struct amd64_pvt *pvt;
int intlv_shift;
u64 input_addr;
pvt = mci->pvt_info;
/*
* See the start of section 3.4.4 (p. 70, BKDG #26094, K8, revA-E)
* concerning translating a DramAddr to an InputAddr.
*/
intlv_shift = num_node_interleave_bits(pvt->dram_IntlvEn[0]);
input_addr = ((dram_addr >> intlv_shift) & 0xffffff000ull) +
(dram_addr & 0xfff);
debugf2(" Intlv Shift=%d DramAddr=0x%lx maps to InputAddr=0x%lx\n",
intlv_shift, (unsigned long)dram_addr,
(unsigned long)input_addr);
return input_addr;
}
/*
* Translate the SysAddr represented by @sys_addr to an InputAddr. It is
* assumed that @sys_addr maps to the node given by mci.
*/
static u64 sys_addr_to_input_addr(struct mem_ctl_info *mci, u64 sys_addr)
{
u64 input_addr;
input_addr =
dram_addr_to_input_addr(mci, sys_addr_to_dram_addr(mci, sys_addr));
debugf2("SysAdddr 0x%lx translates to InputAddr 0x%lx\n",
(unsigned long)sys_addr, (unsigned long)input_addr);
return input_addr;
}
/*
* @input_addr is an InputAddr associated with the node represented by mci.
* Translate @input_addr to a DramAddr and return the result.
*/
static u64 input_addr_to_dram_addr(struct mem_ctl_info *mci, u64 input_addr)
{
struct amd64_pvt *pvt;
int node_id, intlv_shift;
u64 bits, dram_addr;
u32 intlv_sel;
/*
* Near the start of section 3.4.4 (p. 70, BKDG #26094, K8, revA-E)
* shows how to translate a DramAddr to an InputAddr. Here we reverse
* this procedure. When translating from a DramAddr to an InputAddr, the
* bits used for node interleaving are discarded. Here we recover these
* bits from the IntlvSel field of the DRAM Limit register (section
* 3.4.4.2) for the node that input_addr is associated with.
*/
pvt = mci->pvt_info;
node_id = pvt->mc_node_id;
BUG_ON((node_id < 0) || (node_id > 7));
intlv_shift = num_node_interleave_bits(pvt->dram_IntlvEn[0]);
if (intlv_shift == 0) {
debugf1(" InputAddr 0x%lx translates to DramAddr of "
"same value\n", (unsigned long)input_addr);
return input_addr;
}
bits = ((input_addr & 0xffffff000ull) << intlv_shift) +
(input_addr & 0xfff);
intlv_sel = pvt->dram_IntlvSel[node_id] & ((1 << intlv_shift) - 1);
dram_addr = bits + (intlv_sel << 12);
debugf1("InputAddr 0x%lx translates to DramAddr 0x%lx "
"(%d node interleave bits)\n", (unsigned long)input_addr,
(unsigned long)dram_addr, intlv_shift);
return dram_addr;
}
/*
* @dram_addr is a DramAddr that maps to the node represented by mci. Convert
* @dram_addr to a SysAddr.
*/
static u64 dram_addr_to_sys_addr(struct mem_ctl_info *mci, u64 dram_addr)
{
struct amd64_pvt *pvt = mci->pvt_info;
u64 hole_base, hole_offset, hole_size, base, limit, sys_addr;
int ret = 0;
ret = amd64_get_dram_hole_info(mci, &hole_base, &hole_offset,
&hole_size);
if (!ret) {
if ((dram_addr >= hole_base) &&
(dram_addr < (hole_base + hole_size))) {
sys_addr = dram_addr + hole_offset;
debugf1("using DHAR to translate DramAddr 0x%lx to "
"SysAddr 0x%lx\n", (unsigned long)dram_addr,
(unsigned long)sys_addr);
return sys_addr;
}
}
amd64_get_base_and_limit(pvt, pvt->mc_node_id, &base, &limit);
sys_addr = dram_addr + base;
/*
* The sys_addr we have computed up to this point is a 40-bit value
* because the k8 deals with 40-bit values. However, the value we are
* supposed to return is a full 64-bit physical address. The AMD
* x86-64 architecture specifies that the most significant implemented
* address bit through bit 63 of a physical address must be either all
* 0s or all 1s. Therefore we sign-extend the 40-bit sys_addr to a
* 64-bit value below. See section 3.4.2 of AMD publication 24592:
* AMD x86-64 Architecture Programmer's Manual Volume 1 Application
* Programming.
*/
sys_addr |= ~((sys_addr & (1ull << 39)) - 1);
debugf1(" Node %d, DramAddr 0x%lx to SysAddr 0x%lx\n",
pvt->mc_node_id, (unsigned long)dram_addr,
(unsigned long)sys_addr);
return sys_addr;
}
/*
* @input_addr is an InputAddr associated with the node given by mci. Translate
* @input_addr to a SysAddr.
*/
static inline u64 input_addr_to_sys_addr(struct mem_ctl_info *mci,
u64 input_addr)
{
return dram_addr_to_sys_addr(mci,
input_addr_to_dram_addr(mci, input_addr));
}
/*
* Find the minimum and maximum InputAddr values that map to the given @csrow.
* Pass back these values in *input_addr_min and *input_addr_max.
*/
static void find_csrow_limits(struct mem_ctl_info *mci, int csrow,
u64 *input_addr_min, u64 *input_addr_max)
{
struct amd64_pvt *pvt;
u64 base, mask;
pvt = mci->pvt_info;
BUG_ON((csrow < 0) || (csrow >= CHIPSELECT_COUNT));
base = base_from_dct_base(pvt, csrow);
mask = mask_from_dct_mask(pvt, csrow);
*input_addr_min = base & ~mask;
*input_addr_max = base | mask | pvt->dcs_mask_notused;
}
/*
* Extract error address from MCA NB Address Low (section 3.6.4.5) and MCA NB
* Address High (section 3.6.4.6) register values and return the result. Address
* is located in the info structure (nbeah and nbeal), the encoding is device
* specific.
*/
static u64 extract_error_address(struct mem_ctl_info *mci,
struct amd64_error_info_regs *info)
{
struct amd64_pvt *pvt = mci->pvt_info;
return pvt->ops->get_error_address(mci, info);
}
/* Map the Error address to a PAGE and PAGE OFFSET. */
static inline void error_address_to_page_and_offset(u64 error_address,
u32 *page, u32 *offset)
{
*page = (u32) (error_address >> PAGE_SHIFT);
*offset = ((u32) error_address) & ~PAGE_MASK;
}
/*
* @sys_addr is an error address (a SysAddr) extracted from the MCA NB Address
* Low (section 3.6.4.5) and MCA NB Address High (section 3.6.4.6) registers
* of a node that detected an ECC memory error. mci represents the node that
* the error address maps to (possibly different from the node that detected
* the error). Return the number of the csrow that sys_addr maps to, or -1 on
* error.
*/
static int sys_addr_to_csrow(struct mem_ctl_info *mci, u64 sys_addr)
{
int csrow;
csrow = input_addr_to_csrow(mci, sys_addr_to_input_addr(mci, sys_addr));
if (csrow == -1)
amd64_mc_printk(mci, KERN_ERR,
"Failed to translate InputAddr to csrow for "
"address 0x%lx\n", (unsigned long)sys_addr);
return csrow;
}