sgi-xp: create a common xp_remote_memcpy() function (908787db) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/misc/sgi-xp/xp.h

+2 −41

Original line number	Diff line number	Diff line
		@@ -17,7 +17,6 @@
		#include <linux/hardirq.h>
		#include <linux/mutex.h>
		#include <asm/sn/types.h>
		#include <asm/sn/bte.h>
		#ifdef CONFIG_IA64
		#include <asm/sn/arch.h>
		#endif
		@@ -71,46 +70,6 @@
		#define XP_NASID_MASK_BYTES ((XP_MAX_PHYSNODE_ID + 7) / 8)
		#define XP_NASID_MASK_WORDS ((XP_MAX_PHYSNODE_ID + 63) / 64)

		/*
		* Wrapper for bte_copy() that should it return a failure status will retry
		* the bte_copy() once in the hope that the failure was due to a temporary
		* aberration (i.e., the link going down temporarily).
		*
		* src - physical address of the source of the transfer.
		* vdst - virtual address of the destination of the transfer.
		* len - number of bytes to transfer from source to destination.
		* mode - see bte_copy() for definition.
		* notification - see bte_copy() for definition.
		*
		* Note: xp_bte_copy() should never be called while holding a spinlock.
		*/
		static inline bte_result_t
		xp_bte_copy(u64 src, u64 vdst, u64 len, u64 mode, void *notification)
		{
		bte_result_t ret;
		u64 pdst = ia64_tpa(vdst);

		/*
		* Ensure that the physically mapped memory is contiguous.
		*
		* We do this by ensuring that the memory is from region 7 only.
		* If the need should arise to use memory from one of the other
		* regions, then modify the BUG_ON() statement to ensure that the
		* memory from that region is always physically contiguous.
		*/
		BUG_ON(REGION_NUMBER(vdst) != RGN_KERNEL);

		ret = bte_copy(src, pdst, len, mode, notification);
		if ((ret != BTE_SUCCESS) && BTE_ERROR_RETRY(ret)) {
		if (!in_interrupt())
		cond_resched();

		ret = bte_copy(src, pdst, len, mode, notification);
		}

		return ret;
		}

		/*
		* XPC establishes channel connections between the local partition and any
		* other partition that is currently up. Over these channels, kernel-level
		@@ -408,6 +367,8 @@ xpc_partid_to_nasids(short partid, void *nasids)

		extern short xp_max_npartitions;

		extern enum xp_retval (xp_remote_memcpy) (void , const void *, size_t);

		extern u64 xp_nofault_PIOR_target;
		extern int xp_nofault_PIOR(void *);
		extern int xp_error_PIOR(void);

drivers/misc/sgi-xp/xp_main.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -36,6 +36,9 @@ struct device *xp = &xp_dbg_subname;
		short xp_max_npartitions;
		EXPORT_SYMBOL_GPL(xp_max_npartitions);

		enum xp_retval (xp_remote_memcpy) (void dst, const void *src, size_t len);
		EXPORT_SYMBOL_GPL(xp_remote_memcpy);

		/*
		* xpc_registrations[] keeps track of xpc_connect()'s done by the kernel-level
		* users of XPC.

drivers/misc/sgi-xp/xp_sn2.c

+46 −0

Original line number	Diff line number	Diff line
		@@ -13,6 +13,7 @@
		*/

		#include <linux/device.h>
		#include <asm/sn/bte.h>
		#include <asm/sn/sn_sal.h>
		#include "xp.h"

		@@ -72,6 +73,49 @@ xp_unregister_nofault_code_sn2(void)
		err_func_addr, 1, 0);
		}

		/*
		* Wrapper for bte_copy().
		*
		* vdst - virtual address of the destination of the transfer.
		* psrc - physical address of the source of the transfer.
		* len - number of bytes to transfer from source to destination.
		*
		* Note: xp_remote_memcpy_sn2() should never be called while holding a spinlock.
		*/
		static enum xp_retval
		xp_remote_memcpy_sn2(void vdst, const void psrc, size_t len)
		{
		bte_result_t ret;
		u64 pdst = ia64_tpa(vdst);
		/* >>> What are the rules governing the src and dst addresses passed in?
		* >>> Currently we're assuming that dst is a virtual address and src
		* >>> is a physical address, is this appropriate? Can we allow them to
		* >>> be whatever and we make the change here without damaging the
		* >>> addresses?
		*/

		/*
		* Ensure that the physically mapped memory is contiguous.
		*
		* We do this by ensuring that the memory is from region 7 only.
		* If the need should arise to use memory from one of the other
		* regions, then modify the BUG_ON() statement to ensure that the
		* memory from that region is always physically contiguous.
		*/
		BUG_ON(REGION_NUMBER(vdst) != RGN_KERNEL);

		ret = bte_copy((u64)psrc, pdst, len, (BTE_NOTIFY \| BTE_WACQUIRE), NULL);
		if (ret == BTE_SUCCESS)
		return xpSuccess;

		if (is_shub2())
		dev_err(xp, "bte_copy() on shub2 failed, error=0x%x\n", ret);
		else
		dev_err(xp, "bte_copy() failed, error=%d\n", ret);

		return xpBteCopyError;
		}

		enum xp_retval
		xp_init_sn2(void)
		{
		@@ -79,6 +123,8 @@ xp_init_sn2(void)

		xp_max_npartitions = XP_MAX_NPARTITIONS_SN2;

		xp_remote_memcpy = xp_remote_memcpy_sn2;

		return xp_register_nofault_code_sn2();
		}

drivers/misc/sgi-xp/xp_uv.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -15,12 +15,23 @@

		#include "xp.h"

		static enum xp_retval
		xp_remote_memcpy_uv(void vdst, const void psrc, size_t len)
		{
		/* >>> this function needs fleshing out */
		return xpUnsupported;
		}

		enum xp_retval
		xp_init_uv(void)
		{
		BUG_ON(!is_uv());

		xp_max_npartitions = XP_MAX_NPARTITIONS_UV;

		xp_remote_memcpy = xp_remote_memcpy_uv;

		return xpSuccess;
		}

		void

drivers/misc/sgi-xp/xpc.h

+0 −7

Original line number	Diff line number	Diff line
		@@ -20,7 +20,6 @@
		#include <linux/completion.h>
		#include <asm/pgtable.h>
		#include <asm/processor.h>
		#include <asm/sn/bte.h>
		#include <asm/sn/clksupport.h>
		#include <asm/sn/addrs.h>
		#include <asm/sn/mspec.h>
		@@ -1125,12 +1124,6 @@ xpc_IPI_init(int index)
		return amo;
		}

		static inline enum xp_retval
		xpc_map_bte_errors(bte_result_t error)
		{
		return ((error == BTE_SUCCESS) ? xpSuccess : xpBteCopyError);
		}

		/*
		* Check to see if there is any channel activity to/from the specified
		* partition.