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X86: uv: implement a gru_read_gpa kernel function

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The BIOS has decided to store a pointer to the partition reserved page in
a scratch MMR.  The GRU is only able to read an MMR using a vload
instruction.  The gru_read_gpa() function will implemented.

Signed-off-by: Robin Holt <holt@sgi.com>
Signed-off-by: Jack Steiner <steiner@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Robin Holt 2009-12-15 16:47:55 -08:00 committed by Linus Torvalds
parent fae419f2ab
commit 289750d1f1
5 changed files with 52 additions and 0 deletions
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13
drivers/misc/sgi-gru/gru_instructions.h
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@ -340,6 +340,19 @@ static inline void gru_start_instruction(struct gru_instruction *ins, int op32)
* - nelem and stride are in elements
* - tri0/tri1 is in bytes for the beginning of the data segment.
*/
static inline void gru_vload_phys(void *cb, unsigned long gpa,
unsigned int tri0, int iaa, unsigned long hints)
{
struct gru_instruction *ins = (struct gru_instruction *)cb;
ins->baddr0 = (long)gpa | ((unsigned long)iaa << 62);
ins->nelem = 1;
ins->tri0 = tri0;
ins->op1_stride = 1;
gru_start_instruction(ins, __opword(OP_VLOAD, 0, XTYPE_DW, iaa, 0,
CB_IMA(hints)));
}
static inline void gru_vload(void *cb, unsigned long mem_addr,
unsigned int tri0, unsigned char xtype, unsigned long nelem,
unsigned long stride, unsigned long hints)

23
drivers/misc/sgi-gru/grukservices.c
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@ -857,6 +857,29 @@ EXPORT_SYMBOL_GPL(gru_get_next_message);
/* ---------------------- GRU DATA COPY FUNCTIONS ---------------------------*/
/*
* Load a DW from a global GPA. The GPA can be a memory or MMR address.
*/
int gru_read_gpa(unsigned long *value, unsigned long gpa)
{
void *cb;
void *dsr;
int ret, iaa;
STAT(read_gpa);
if (gru_get_cpu_resources(GRU_NUM_KERNEL_DSR_BYTES, &cb, &dsr))
return MQE_BUG_NO_RESOURCES;
iaa = gpa >> 62;
gru_vload_phys(cb, gpa, gru_get_tri(dsr), iaa, IMA);
ret = gru_wait(cb);
if (ret == CBS_IDLE)
*value = *(unsigned long *)dsr;
gru_free_cpu_resources(cb, dsr);
return ret;
}
EXPORT_SYMBOL_GPL(gru_read_gpa);
/*
* Copy a block of data using the GRU resources
*/

14
drivers/misc/sgi-gru/grukservices.h
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@ -130,6 +130,20 @@ extern void gru_free_message(struct gru_message_queue_desc *mqd,
extern void *gru_get_next_message(struct gru_message_queue_desc *mqd);
/*
* Read a GRU global GPA. Source can be located in a remote partition.
*
* Input:
* value memory address where MMR value is returned
* gpa source numalink physical address of GPA
*
* Output:
* 0 OK
* >0 error
*/
int gru_read_gpa(unsigned long *value, unsigned long gpa);
/*
* Copy data using the GRU. Source or destination can be located in a remote
* partition.

1
drivers/misc/sgi-gru/gruprocfs.c
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@ -98,6 +98,7 @@ static int statistics_show(struct seq_file *s, void *p)
printstat(s, flush_tlb_gru_tgh);
printstat(s, flush_tlb_gru_zero_asid);
printstat(s, copy_gpa);
printstat(s, read_gpa);
printstat(s, mesq_receive);
printstat(s, mesq_receive_none);
printstat(s, mesq_send);

1
drivers/misc/sgi-gru/grutables.h
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@ -224,6 +224,7 @@ struct gru_stats_s {
atomic_long_t flush_tlb_gru_zero_asid;
atomic_long_t copy_gpa;
atomic_long_t read_gpa;
atomic_long_t mesq_receive;
atomic_long_t mesq_receive_none;