drivers/misc/sgi-xp/xp_uv.c

Source file repositories/reference/linux-study-clean/drivers/misc/sgi-xp/xp_uv.c

File Facts

System
Linux kernel
Corpus path
drivers/misc/sgi-xp/xp_uv.c
Extension
.c
Size
3412 bytes
Lines
152
Domain
Driver Families
Bucket
drivers/misc
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <linux/device.h>
#include <asm/uv/uv_hub.h>
#if defined CONFIG_X86_64
#include <asm/uv/bios.h>
#endif
#include "../sgi-gru/grukservices.h"
#include "xp.h"

/*
 * Convert a virtual memory address to a physical memory address.
 */
static unsigned long
xp_pa_uv(void *addr)
{
	return uv_gpa(addr);
}

/*
 * Convert a global physical to socket physical address.
 */
static unsigned long
xp_socket_pa_uv(unsigned long gpa)
{
	return uv_gpa_to_soc_phys_ram(gpa);
}

static enum xp_retval
xp_remote_mmr_read(unsigned long dst_gpa, const unsigned long src_gpa,
		   size_t len)
{
	int ret;
	unsigned long *dst_va = __va(uv_gpa_to_soc_phys_ram(dst_gpa));

	BUG_ON(!uv_gpa_in_mmr_space(src_gpa));
	BUG_ON(len != 8);

	ret = gru_read_gpa(dst_va, src_gpa);
	if (ret == 0)
		return xpSuccess;

	dev_err(xp, "gru_read_gpa() failed, dst_gpa=0x%016lx src_gpa=0x%016lx "
		"len=%ld\n", dst_gpa, src_gpa, len);
	return xpGruCopyError;
}


static enum xp_retval
xp_remote_memcpy_uv(unsigned long dst_gpa, const unsigned long src_gpa,
		    size_t len)
{
	int ret;

	if (uv_gpa_in_mmr_space(src_gpa))
		return xp_remote_mmr_read(dst_gpa, src_gpa, len);

	ret = gru_copy_gpa(dst_gpa, src_gpa, len);
	if (ret == 0)
		return xpSuccess;

	dev_err(xp, "gru_copy_gpa() failed, dst_gpa=0x%016lx src_gpa=0x%016lx "
		"len=%ld\n", dst_gpa, src_gpa, len);
	return xpGruCopyError;
}

static int
xp_cpu_to_nasid_uv(int cpuid)
{
	/* ??? Is this same as sn2 nasid in mach/part bitmaps set up by SAL? */
	return UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpuid));
}

static enum xp_retval
xp_expand_memprotect_uv(unsigned long phys_addr, unsigned long size)
{
	int ret;

#if defined CONFIG_X86_64
	ret = uv_bios_change_memprotect(phys_addr, size, UV_MEMPROT_ALLOW_RW);
	if (ret != BIOS_STATUS_SUCCESS) {
		dev_err(xp, "uv_bios_change_memprotect(,, "
			"UV_MEMPROT_ALLOW_RW) failed, ret=%d\n", ret);
		return xpBiosError;
	}
#else
	#error not a supported configuration
#endif
	return xpSuccess;
}

static enum xp_retval

Annotation

Implementation Notes