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Commit 289750d1 authored by Robin Holt's avatar Robin Holt Committed by Linus Torvalds
Browse files

X86: uv: implement a gru_read_gpa kernel function 



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: default avatarRobin Holt <holt@sgi.com>
Signed-off-by: default avatarJack Steiner <steiner@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fae419f2

drivers/misc/sgi-gru/gru_instructions.h

+13 −0
Original line number Diff line number Diff line
@@ -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)

drivers/misc/sgi-gru/grukservices.c

+23 −0
Original line number Diff line number Diff line
@@ -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

 */

drivers/misc/sgi-gru/grukservices.h

+14 −0
Original line number Diff line number Diff line
@@ -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.

drivers/misc/sgi-gru/gruprocfs.c

+1 −0
Original line number Diff line number Diff line
@@ -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);

drivers/misc/sgi-gru/grutables.h

+1 −0
Original line number Diff line number Diff line
@@ -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;