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i7300_edac: Improve comments 

This is basically a cleanup patch, improving the comments for each
function.

While here, do a few cleanups.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2010-08-27 17:28:50 -03:00
parent b4552aceb3
commit d091a6eb17
1 changed files with 104 additions and 116 deletions
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220
drivers/edac/i7300_edac.c
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@ -121,14 +121,6 @@ static struct edac_pci_ctl_info *i7300_pci;
* i7300 Register definitions for memory enumeration
***************************************************/
/*
* I7300 devices:
* All 3 functions of Device 16 (0,1,2) share the SAME DID and
* uses PCI_DEVICE_ID_INTEL_I7300_MCH_ERR for device 16 (0,1,2).
* PCI_DEVICE_ID_INTEL_I7300_MCH_FB0 is used for device 21 (0,1)
* and PCI_DEVICE_ID_INTEL_I7300_MCH_FB1 is used for device 21 (0,1).
*/
/*
* Device 16,
* Function 0: System Address (not documented)
@ -345,9 +337,24 @@ static const char *ferr_global_lo_name[] = {
* i7300 Functions related to error detection
********************************************/
const char *get_err_from_table(const char *table[], int size, int pos)
/**
* get_err_from_table() - Gets the error message from a table
* @table: table name (array of char *)
* @size: number of elements at the table
* @pos: position of the element to be returned
*
* This is a small routine that gets the pos-th element of a table. If the
* element doesn't exist (or it is empty), it returns "reserved".
* Instead of calling it directly, the better is to call via the macro
* GET_ERR_FROM_TABLE(), that automatically checks the table size via
* ARRAY_SIZE() macro
*/
static const char *get_err_from_table(const char *table[], int size, int pos)
{
if (pos >= size)
if (unlikely(pos >= size))
return "Reserved";
if (unlikely(!table[pos]))
return "Reserved";
return table[pos];
@ -356,10 +363,11 @@ const char *get_err_from_table(const char *table[], int size, int pos)
#define GET_ERR_FROM_TABLE(table, pos) \
get_err_from_table(table, ARRAY_SIZE(table), pos)
/*
* i7300_process_error_global Retrieve the hardware error information from
* the hardware and cache it in the 'info'
* structure
/**
* i7300_process_error_global() - Retrieve the hardware error information from
* the hardware global error registers and
* sends it to dmesg
* @mci: struct mem_ctl_info pointer
*/
static void i7300_process_error_global(struct mem_ctl_info *mci)
{
@ -410,10 +418,11 @@ error_global:
is_fatal ? "Fatal" : "NOT fatal", specific);
}
/*
* i7300_process_fbd_error Retrieve the hardware error information from
* the hardware and cache it in the 'info'
* structure
/**
* i7300_process_fbd_error() - Retrieve the hardware error information from
* the FBD error registers and sends it via
* EDAC error API calls
* @mci: struct mem_ctl_info pointer
*/
static void i7300_process_fbd_error(struct mem_ctl_info *mci)
{
@ -524,10 +533,9 @@ static void i7300_process_fbd_error(struct mem_ctl_info *mci)
return;
}
/*
* i7300_check_error Retrieve the hardware error information from
* the hardware and cache it in the 'info'
* structure
/**
* i7300_check_error() - Calls the error checking subroutines
* @mci: struct mem_ctl_info pointer
*/
static void i7300_check_error(struct mem_ctl_info *mci)
{
@ -535,11 +543,9 @@ static void i7300_check_error(struct mem_ctl_info *mci)
i7300_process_fbd_error(mci);
};
/*
* i7300_clear_error Retrieve any error from the hardware
* but do NOT process that error.
* Used for 'clearing' out of previous errors
* Called by the Core module.
/**
* i7300_clear_error() - Clears the error registers
* @mci: struct mem_ctl_info pointer
*/
static void i7300_clear_error(struct mem_ctl_info *mci)
{
@ -573,9 +579,10 @@ static void i7300_clear_error(struct mem_ctl_info *mci)
FERR_NF_FBD, value);
}
/*
* i7300_enable_error_reporting
* Turn on the memory reporting features of the hardware
/**
* i7300_enable_error_reporting() - Enable the memory reporting logic at the
* hardware
* @mci: struct mem_ctl_info pointer
*/
static void i7300_enable_error_reporting(struct mem_ctl_info *mci)
{
@ -597,10 +604,14 @@ static void i7300_enable_error_reporting(struct mem_ctl_info *mci)
* i7300 Functions related to memory enumberation
************************************************/
/*
* determine_mtr(pvt, csrow, channel)
*
* return the proper MTR register as determine by the csrow and desired channel
/**
* decode_mtr() - Decodes the MTR descriptor, filling the edac structs
* @pvt: pointer to the private data struct used by i7300 driver
* @slot: DIMM slot (0 to 7)
* @ch: Channel number within the branch (0 or 1)
* @branch: Branch number (0 or 1)
* @dinfo: Pointer to DIMM info where dimm size is stored
* @p_csrow: Pointer to the struct csrow_info that corresponds to that element
*/
static int decode_mtr(struct i7300_pvt *pvt,
int slot, int ch, int branch,
@ -619,14 +630,8 @@ static int decode_mtr(struct i7300_pvt *pvt,
ans ? "Present" : "NOT Present");
/* Determine if there is a DIMM present in this DIMM slot */
#if 0
if (!amb_present || !ans)
return 0;
#else
if (!ans)
return 0;
#endif
/* Start with the number of bits for a Bank
* on the DRAM */
@ -692,14 +697,15 @@ static int decode_mtr(struct i7300_pvt *pvt,
return mtr;
}
/*
* print_dimm_size
/**
* print_dimm_size() - Prints dump of the memory organization
* @pvt: pointer to the private data struct used by i7300 driver
*
* also will output a DIMM matrix map, if debug is enabled, for viewing
* how the DIMMs are populated
* Useful for debug. If debug is disabled, this routine do nothing
*/
static void print_dimm_size(struct i7300_pvt *pvt)
{
#ifdef CONFIG_EDAC_DEBUG
struct i7300_dimm_info *dinfo;
char *p;
int space, n;
@ -751,30 +757,26 @@ static void print_dimm_size(struct i7300_pvt *pvt)
debugf2("%s\n", pvt->tmp_prt_buffer);
p = pvt->tmp_prt_buffer;
space = PAGE_SIZE;
#endif
}
/*
* i7300_init_csrows Initialize the 'csrows' table within
* the mci control structure with the
* addressing of memory.
*
* return:
* 0 success
* 1 no actual memory found on this MC
/**
* i7300_init_csrows() - Initialize the 'csrows' table within
* the mci control structure with the
* addressing of memory.
* @mci: struct mem_ctl_info pointer
*/
static int i7300_init_csrows(struct mem_ctl_info *mci)
{
struct i7300_pvt *pvt;
struct i7300_dimm_info *dinfo;
struct csrow_info *p_csrow;
int empty;
int rc = -ENODEV;
int mtr;
int ch, branch, slot, channel;
pvt = mci->pvt_info;
empty = 1; /* Assume NO memory */
debugf2("Memory Technology Registers:\n");
/* Get the AMB present registers for the four channels */
@ -819,14 +821,19 @@ static int i7300_init_csrows(struct mem_ctl_info *mci)
p_csrow->last_page = 9 + slot * 20;
p_csrow->page_mask = 0xfff;
empty = 0;
rc = 0;
}
}
}
return empty;
return rc;
}
/**
* decode_mir() - Decodes Memory Interleave Register (MIR) info
* @int mir_no: number of the MIR register to decode
* @mir: array with the MIR data cached on the driver
*/
static void decode_mir(int mir_no, u16 mir[MAX_MIR])
{
if (mir[mir_no] & 3)
@ -837,11 +844,11 @@ static void decode_mir(int mir_no, u16 mir[MAX_MIR])
(mir[mir_no] & 2) ? "B1": "");
}
/*
* i7300_get_mc_regs read in the necessary registers and
* cache locally
/**
* i7300_get_mc_regs() - Get the contents of the MC enumeration registers
* @mci: struct mem_ctl_info pointer
*
* Fills in the private data members
* Data read is cached internally for its usage when needed
*/
static int i7300_get_mc_regs(struct mem_ctl_info *mci)
{
@ -907,9 +914,9 @@ static int i7300_get_mc_regs(struct mem_ctl_info *mci)
* i7300 Functions related to device probe/release
*************************************************/
/*
* i7300_put_devices 'put' all the devices that we have
* reserved via 'get'
/**
* i7300_put_devices() - Release the PCI devices
* @mci: struct mem_ctl_info pointer
*/
static void i7300_put_devices(struct mem_ctl_info *mci)
{
@ -925,13 +932,18 @@ static void i7300_put_devices(struct mem_ctl_info *mci)
pci_dev_put(pvt->pci_dev_16_1_fsb_addr_map);
}
/*
* i7300_get_devices Find and perform 'get' operation on the MCH's
* device/functions we want to reference for this driver
/**
* i7300_get_devices() - Find and perform 'get' operation on the MCH's
* device/functions we want to reference for this driver
* @mci: struct mem_ctl_info pointer
*
* Need to 'get' device 16 func 1 and func 2
* Access and prepare the several devices for usage:
* I7300 devices used by this driver:
* Device 16, functions 0,1 and 2: PCI_DEVICE_ID_INTEL_I7300_MCH_ERR
* Device 21 function 0: PCI_DEVICE_ID_INTEL_I7300_MCH_FB0
* Device 22 function 0: PCI_DEVICE_ID_INTEL_I7300_MCH_FB1
*/
static int i7300_get_devices(struct mem_ctl_info *mci, int dev_idx)
static int __devinit i7300_get_devices(struct mem_ctl_info *mci)
{
struct i7300_pvt *pvt;
struct pci_dev *pdev;
@ -1007,23 +1019,25 @@ error:
return -ENODEV;
}
/*
* i7300_probe1 Probe for ONE instance of device to see if it is
* present.
* return:
* 0 for FOUND a device
* < 0 for error code
/**
* i7300_init_one() - Probe for one instance of the device
* @pdev: struct pci_dev pointer
* @id: struct pci_device_id pointer - currently unused
*/
static int i7300_probe1(struct pci_dev *pdev, int dev_idx)
static int __devinit i7300_init_one(struct pci_dev *pdev,
const struct pci_device_id *id)
{
struct mem_ctl_info *mci;
struct i7300_pvt *pvt;
int num_channels;
int num_dimms_per_channel;
int num_csrows;
int rc;
if (dev_idx >= ARRAY_SIZE(i7300_devs))
return -EINVAL;
/* wake up device */
rc = pci_enable_device(pdev);
if (rc == -EIO)
return rc;
debugf0("MC: " __FILE__ ": %s(), pdev bus %u dev=0x%x fn=0x%x\n",
__func__,
@ -1068,7 +1082,7 @@ static int i7300_probe1(struct pci_dev *pdev, int dev_idx)
}
/* 'get' the pci devices we want to reserve for our use */
if (i7300_get_devices(mci, dev_idx))
if (i7300_get_devices(mci))
goto fail0;
mci->mc_idx = 0;
@ -1077,7 +1091,7 @@ static int i7300_probe1(struct pci_dev *pdev, int dev_idx)
mci->edac_cap = EDAC_FLAG_NONE;
mci->mod_name = "i7300_edac.c";
mci->mod_ver = I7300_REVISION;
mci->ctl_name = i7300_devs[dev_idx].ctl_name;
mci->ctl_name = i7300_devs[0].ctl_name;
mci->dev_name = pci_name(pdev);
mci->ctl_page_to_phys = NULL;
@ -1132,32 +1146,9 @@ fail0:
return -ENODEV;
}
/*
* i7300_init_one constructor for one instance of device
*
* returns:
* negative on error
* count (>= 0)
*/
static int __devinit i7300_init_one(struct pci_dev *pdev,
const struct pci_device_id *id)
{
int rc;
debugf0("MC: " __FILE__ ": %s()\n", __func__);
/* wake up device */
rc = pci_enable_device(pdev);
if (rc == -EIO)
return rc;
/* now probe and enable the device */
return i7300_probe1(pdev, id->driver_data);
}
/*
* i7300_remove_one destructor for one instance of device
*
/**
* i7300_remove_one() - Remove the driver
* @pdev: struct pci_dev pointer
*/
static void __devexit i7300_remove_one(struct pci_dev *pdev)
{
@ -1183,9 +1174,9 @@ static void __devexit i7300_remove_one(struct pci_dev *pdev)
}
/*
* pci_device_id table for which devices we are looking for
* pci_device_id: table for which devices we are looking for
*
* The "E500P" device is the first device supported.
* Has only 8086:360c PCI ID
*/
static const struct pci_device_id i7300_pci_tbl[] __devinitdata = {
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_I7300_MCH_ERR)},
@ -1195,8 +1186,7 @@ static const struct pci_device_id i7300_pci_tbl[] __devinitdata = {
MODULE_DEVICE_TABLE(pci, i7300_pci_tbl);
/*
* i7300_driver pci_driver structure for this module
*
* i7300_driver: pci_driver structure for this module
*/
static struct pci_driver i7300_driver = {
.name = "i7300_edac",
@ -1205,9 +1195,8 @@ static struct pci_driver i7300_driver = {
.id_table = i7300_pci_tbl,
};
/*
* i7300_init Module entry function
* Try to initialize this module for its devices
/**
* i7300_init() - Registers the driver
*/
static int __init i7300_init(void)
{
@ -1223,9 +1212,8 @@ static int __init i7300_init(void)
return (pci_rc < 0) ? pci_rc : 0;
}
/*
* i7300_exit() Module exit function
* Unregister the driver
/**
* i7300_init() - Unregisters the driver
*/
static void __exit i7300_exit(void)
{