[Patch 05/18] create a common xp_remote_memcpy() function

From: Dean Nelson
Date: Fri Jun 06 2008 - 12:47:36 EST

Create a common remote memcpy function that maps to what the hardware booted
supports.

Signed-off-by: Dean Nelson <dcn@xxxxxxx>

---

drivers/misc/sgi-xp/xp.h | 43 +------------------------
drivers/misc/sgi-xp/xp_main.c | 3 +
drivers/misc/sgi-xp/xp_sn2.c | 46 ++++++++++++++++++++++++++
drivers/misc/sgi-xp/xp_uv.c | 11 ++++++
drivers/misc/sgi-xp/xpc.h | 7 ----
drivers/misc/sgi-xp/xpc_channel.c | 20 ++++-------
drivers/misc/sgi-xp/xpc_partition.c | 55 +++++++++++++-------------------
drivers/misc/sgi-xp/xpnet.c | 30 ++++++++---------
8 files changed, 108 insertions(+), 107 deletions(-)

Index: linux-2.6/drivers/misc/sgi-xp/xp.h
===================================================================
--- linux-2.6.orig/drivers/misc/sgi-xp/xp.h 2008-05-30 13:55:49.537296334 -0500
+++ linux-2.6/drivers/misc/sgi-xp/xp.h 2008-05-30 13:56:05.871344137 -0500
@@ -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
@@ -72,46 +71,6 @@
#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
* `users' can communicate with their counterparts on the other partitions.
@@ -408,6 +367,8 @@ xpc_partid_to_nasids(short partid, void

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);
Index: linux-2.6/drivers/misc/sgi-xp/xp_main.c
===================================================================
--- linux-2.6.orig/drivers/misc/sgi-xp/xp_main.c 2008-05-30 13:55:49.665312383 -0500
+++ linux-2.6/drivers/misc/sgi-xp/xp_main.c 2008-05-30 13:56:05.887346143 -0500
@@ -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.
Index: linux-2.6/drivers/misc/sgi-xp/xp_sn2.c
===================================================================
--- linux-2.6.orig/drivers/misc/sgi-xp/xp_sn2.c 2008-05-30 13:55:49.689315393 -0500
+++ linux-2.6/drivers/misc/sgi-xp/xp_sn2.c 2008-05-30 13:56:05.911349152 -0500
@@ -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();
}

Index: linux-2.6/drivers/misc/sgi-xp/xp_uv.c
===================================================================
--- linux-2.6.orig/drivers/misc/sgi-xp/xp_uv.c 2008-05-30 13:55:49.713318402 -0500
+++ linux-2.6/drivers/misc/sgi-xp/xp_uv.c 2008-05-30 13:56:05.935352162 -0500
@@ -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
Index: linux-2.6/drivers/misc/sgi-xp/xpc.h
===================================================================
--- linux-2.6.orig/drivers/misc/sgi-xp/xpc.h 2008-05-30 13:55:49.561299343 -0500
+++ linux-2.6/drivers/misc/sgi-xp/xpc.h 2008-05-30 13:56:05.955354669 -0500
@@ -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.
Index: linux-2.6/drivers/misc/sgi-xp/xpc_channel.c
===================================================================
--- linux-2.6.orig/drivers/misc/sgi-xp/xpc_channel.c 2008-05-30 13:55:49.609305362 -0500
+++ linux-2.6/drivers/misc/sgi-xp/xpc_channel.c 2008-05-30 13:56:05.975357177 -0500
@@ -21,7 +21,6 @@
#include <linux/interrupt.h>
#include <linux/mutex.h>
#include <linux/completion.h>
-#include <asm/sn/bte.h>
#include <asm/sn/sn_sal.h>
#include "xpc.h"

@@ -252,13 +251,13 @@ xpc_setup_infrastructure(struct xpc_part
*
* src must be a cacheline aligned physical address on the remote partition.
* dst must be a cacheline aligned virtual address on this partition.
- * cnt must be an cacheline sized
+ * cnt must be cacheline sized
*/
static enum xp_retval
xpc_pull_remote_cachelines(struct xpc_partition *part, void *dst,
const void *src, size_t cnt)
{
- bte_result_t bte_ret;
+ enum xp_retval ret;

DBUG_ON((u64)src != L1_CACHE_ALIGN((u64)src));
DBUG_ON((u64)dst != L1_CACHE_ALIGN((u64)dst));
@@ -267,15 +266,12 @@ xpc_pull_remote_cachelines(struct xpc_pa
if (part->act_state == XPC_P_DEACTIVATING)
return part->reason;

- bte_ret = xp_bte_copy((u64)src, (u64)dst, (u64)cnt,
- (BTE_NORMAL | BTE_WACQUIRE), NULL);
- if (bte_ret == BTE_SUCCESS)
- return xpSuccess;
-
- dev_dbg(xpc_chan, "xp_bte_copy() from partition %d failed, ret=%d\n",
- XPC_PARTID(part), bte_ret);
-
- return xpc_map_bte_errors(bte_ret);
+ ret = xp_remote_memcpy(dst, src, cnt);
+ if (ret != xpSuccess) {
+ dev_dbg(xpc_chan, "xp_remote_memcpy() from partition %d failed,"
+ " ret=%d\n", XPC_PARTID(part), ret);
+ }
+ return ret;
}

/*
Index: linux-2.6/drivers/misc/sgi-xp/xpc_partition.c
===================================================================
--- linux-2.6.orig/drivers/misc/sgi-xp/xpc_partition.c 2008-05-30 13:55:49.589302854 -0500
+++ linux-2.6/drivers/misc/sgi-xp/xpc_partition.c 2008-05-30 13:56:05.999360186 -0500
@@ -21,7 +21,6 @@
#include <linux/mmzone.h>
#include <linux/nodemask.h>
#include <asm/uncached.h>
-#include <asm/sn/bte.h>
#include <asm/sn/intr.h>
#include <asm/sn/sn_sal.h>
#include <asm/sn/nodepda.h>
@@ -92,7 +91,7 @@ xpc_kmalloc_cacheline_aligned(size_t siz
static u64
xpc_get_rsvd_page_pa(int nasid)
{
- bte_result_t bte_res;
+ enum xp_retval ret;
s64 status;
u64 cookie = 0;
u64 rp_pa = nasid; /* seed with nasid */
@@ -113,6 +112,7 @@ xpc_get_rsvd_page_pa(int nasid)
if (status != SALRET_MORE_PASSES)
break;

+ /* >>> L1_CACHE_ALIGN() is only a sn2-bte_copy requirement */
if (L1_CACHE_ALIGN(len) > buf_len) {
kfree(buf_base);
buf_len = L1_CACHE_ALIGN(len);
@@ -127,10 +127,9 @@ xpc_get_rsvd_page_pa(int nasid)
}
}

- bte_res = xp_bte_copy(rp_pa, buf, buf_len,
- (BTE_NOTIFY | BTE_WACQUIRE), NULL);
- if (bte_res != BTE_SUCCESS) {
- dev_dbg(xpc_part, "xp_bte_copy failed %i\n", bte_res);
+ ret = xp_remote_memcpy((void *)buf, (void *)rp_pa, buf_len);
+ if (ret != xpSuccess) {
+ dev_dbg(xpc_part, "xp_remote_memcpy failed %d\n", ret);
status = SALRET_ERROR;
break;
}
@@ -398,7 +397,7 @@ xpc_check_remote_hb(void)
struct xpc_vars *remote_vars;
struct xpc_partition *part;
short partid;
- bte_result_t bres;
+ enum xp_retval ret;

remote_vars = (struct xpc_vars *)xpc_remote_copy_buffer;

@@ -418,13 +417,11 @@ xpc_check_remote_hb(void)
}

/* pull the remote_hb cache line */
- bres = xp_bte_copy(part->remote_vars_pa,
- (u64)remote_vars,
- XPC_RP_VARS_SIZE,
- (BTE_NOTIFY | BTE_WACQUIRE), NULL);
- if (bres != BTE_SUCCESS) {
- XPC_DEACTIVATE_PARTITION(part,
- xpc_map_bte_errors(bres));
+ ret = xp_remote_memcpy(remote_vars,
+ (void *)part->remote_vars_pa,
+ XPC_RP_VARS_SIZE);
+ if (ret != xpSuccess) {
+ XPC_DEACTIVATE_PARTITION(part, ret);
continue;
}

@@ -457,7 +454,8 @@ static enum xp_retval
xpc_get_remote_rp(int nasid, u64 *discovered_nasids,
struct xpc_rsvd_page *remote_rp, u64 *remote_rp_pa)
{
- int bres, i;
+ int i;
+ enum xp_retval ret;

/* get the reserved page's physical address */

@@ -466,11 +464,10 @@ xpc_get_remote_rp(int nasid, u64 *discov
return xpNoRsvdPageAddr;

/* pull over the reserved page header and part_nasids mask */
- bres = xp_bte_copy(*remote_rp_pa, (u64)remote_rp,
- XPC_RP_HEADER_SIZE + xp_nasid_mask_bytes,
- (BTE_NOTIFY | BTE_WACQUIRE), NULL);
- if (bres != BTE_SUCCESS)
- return xpc_map_bte_errors(bres);
+ ret = xp_remote_memcpy(remote_rp, (void *)*remote_rp_pa,
+ XPC_RP_HEADER_SIZE + xp_nasid_mask_bytes);
+ if (ret != xpSuccess)
+ return ret;

if (discovered_nasids != NULL) {
u64 *remote_part_nasids = XPC_RP_PART_NASIDS(remote_rp);
@@ -504,16 +501,16 @@ xpc_get_remote_rp(int nasid, u64 *discov
static enum xp_retval
xpc_get_remote_vars(u64 remote_vars_pa, struct xpc_vars *remote_vars)
{
- int bres;
+ enum xp_retval ret;

if (remote_vars_pa == 0)
return xpVarsNotSet;

/* pull over the cross partition variables */
- bres = xp_bte_copy(remote_vars_pa, (u64)remote_vars, XPC_RP_VARS_SIZE,
- (BTE_NOTIFY | BTE_WACQUIRE), NULL);
- if (bres != BTE_SUCCESS)
- return xpc_map_bte_errors(bres);
+ ret = xp_remote_memcpy(remote_vars, (void *)remote_vars_pa,
+ XPC_RP_VARS_SIZE);
+ if (ret != xpSuccess)
+ return ret;

if (XPC_VERSION_MAJOR(remote_vars->version) !=
XPC_VERSION_MAJOR(XPC_V_VERSION)) {
@@ -1148,7 +1145,6 @@ xpc_initiate_partid_to_nasids(short part
{
struct xpc_partition *part;
u64 part_nasid_pa;
- int bte_res;

part = &xpc_partitions[partid];
if (part->remote_rp_pa == 0)
@@ -1158,9 +1154,6 @@ xpc_initiate_partid_to_nasids(short part

part_nasid_pa = (u64)XPC_RP_PART_NASIDS(part->remote_rp_pa);

- bte_res = xp_bte_copy(part_nasid_pa, (u64)nasid_mask,
- xp_nasid_mask_bytes, (BTE_NOTIFY | BTE_WACQUIRE),
- NULL);
-
- return xpc_map_bte_errors(bte_res);
+ return xp_remote_memcpy(nasid_mask, (void *)part_nasid_pa,
+ xp_nasid_mask_bytes);
}
Index: linux-2.6/drivers/misc/sgi-xp/xpnet.c
===================================================================
--- linux-2.6.orig/drivers/misc/sgi-xp/xpnet.c 2008-05-30 13:55:49.641309374 -0500
+++ linux-2.6/drivers/misc/sgi-xp/xpnet.c 2008-05-30 13:56:06.039365201 -0500
@@ -32,7 +32,6 @@
#include <linux/mii.h>
#include <linux/smp.h>
#include <linux/string.h>
-#include <asm/sn/bte.h>
#include <asm/sn/io.h>
#include <asm/sn/sn_sal.h>
#include <asm/atomic.h>
@@ -169,7 +168,7 @@ static void
xpnet_receive(short partid, int channel, struct xpnet_message *msg)
{
struct sk_buff *skb;
- bte_result_t bret;
+ enum xp_retval ret;
struct xpnet_dev_private *priv =
(struct xpnet_dev_private *)xpnet_device->priv;

@@ -201,7 +200,7 @@ xpnet_receive(short partid, int channel,

/*
* The allocated skb has some reserved space.
- * In order to use bte_copy, we need to get the
+ * In order to use xp_remote_memcpy(), we need to get the
* skb->data pointer moved forward.
*/
skb_reserve(skb, (L1_CACHE_BYTES - ((u64)skb->data &
@@ -227,25 +226,24 @@ xpnet_receive(short partid, int channel,
(size_t)msg->embedded_bytes);
} else {
dev_dbg(xpnet, "transferring buffer to the skb->data area;\n\t"
- "bte_copy(0x%p, 0x%p, %hu)\n", (void *)msg->buf_pa,
- (void *)__pa((u64)skb->data & ~(L1_CACHE_BYTES - 1)),
- msg->size);
-
- bret = bte_copy(msg->buf_pa,
- __pa((u64)skb->data & ~(L1_CACHE_BYTES - 1)),
- msg->size, (BTE_NOTIFY | BTE_WACQUIRE), NULL);
+ "xp_remote_memcpy(0x%p, 0x%p, %hu)\n", (void *)
+ ((u64)skb->data & ~(L1_CACHE_BYTES - 1)),
+ (void *)msg->buf_pa, msg->size);
+
+ ret = xp_remote_memcpy((void *)((u64)skb->data &
+ ~(L1_CACHE_BYTES - 1)),
+ (void *)msg->buf_pa, msg->size);

- if (bret != BTE_SUCCESS) {
+ if (ret != xpSuccess) {
/*
* >>> Need better way of cleaning skb. Currently skb
* >>> appears in_use and we can't just call
* >>> dev_kfree_skb.
*/
- dev_err(xpnet, "bte_copy(0x%p, 0x%p, 0x%hx) returned "
- "error=0x%x\n", (void *)msg->buf_pa,
- (void *)__pa((u64)skb->data &
- ~(L1_CACHE_BYTES - 1)),
- msg->size, bret);
+ dev_err(xpnet, "xp_remote_memcpy(0x%p, 0x%p, 0x%hx) "
+ "returned error=0x%x\n", (void *)
+ ((u64)skb->data & ~(L1_CACHE_BYTES - 1)),
+ (void *)msg->buf_pa, msg->size, ret);

xpc_received(partid, channel, (void *)msg);

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