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Message-ID: <20090318192041.20375.11506.stgit@dwillia2-linux.ch.intel.com>
Date: Wed, 18 Mar 2009 12:20:41 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: neilb@...e.de, maciej.sosnowski@...el.com
Subject: [PATCH 05/13] async_tx: add sum check flags
Replace the flat zero_sum_result with a collection of flags to contain
the P (xor) zero-sum result, and the soon to be utilized Q (raid6 reed
solomon syndrome) zero-sum result. Use the SUM_CHECK_ namespace instead
of DMA_ since these flags will be used on non-dma-zero-sum enabled
platforms.
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
arch/arm/include/asm/hardware/iop3xx-adma.h | 5 +++--
arch/arm/mach-iop13xx/include/mach/adma.h | 12 +++++++-----
crypto/async_tx/async_xor.c | 4 ++--
drivers/md/raid5.c | 2 +-
drivers/md/raid5.h | 5 +++--
include/linux/async_tx.h | 2 +-
include/linux/dmaengine.h | 21 ++++++++++++++++++++-
7 files changed, 37 insertions(+), 14 deletions(-)
diff --git a/arch/arm/include/asm/hardware/iop3xx-adma.h b/arch/arm/include/asm/hardware/iop3xx-adma.h
index 83e6ba3..26eefea 100644
--- a/arch/arm/include/asm/hardware/iop3xx-adma.h
+++ b/arch/arm/include/asm/hardware/iop3xx-adma.h
@@ -756,13 +756,14 @@ static inline void iop_desc_set_block_fill_val(struct iop_adma_desc_slot *desc,
hw_desc->src[0] = val;
}
-static inline int iop_desc_get_zero_result(struct iop_adma_desc_slot *desc)
+static inline enum sum_check_flags
+iop_desc_get_zero_result(struct iop_adma_desc_slot *desc)
{
struct iop3xx_desc_aau *hw_desc = desc->hw_desc;
struct iop3xx_aau_desc_ctrl desc_ctrl = hw_desc->desc_ctrl_field;
iop_paranoia(!(desc_ctrl.tx_complete && desc_ctrl.zero_result_en));
- return desc_ctrl.zero_result_err;
+ return desc_ctrl.zero_result_err << SUM_CHECK_P;
}
static inline void iop_chan_append(struct iop_adma_chan *chan)
diff --git a/arch/arm/mach-iop13xx/include/mach/adma.h b/arch/arm/mach-iop13xx/include/mach/adma.h
index 5722e86..1cd31df 100644
--- a/arch/arm/mach-iop13xx/include/mach/adma.h
+++ b/arch/arm/mach-iop13xx/include/mach/adma.h
@@ -428,18 +428,20 @@ static inline void iop_desc_set_block_fill_val(struct iop_adma_desc_slot *desc,
hw_desc->block_fill_data = val;
}
-static inline int iop_desc_get_zero_result(struct iop_adma_desc_slot *desc)
+static inline enum sum_check_flags
+iop_desc_get_zero_result(struct iop_adma_desc_slot *desc)
{
struct iop13xx_adma_desc_hw *hw_desc = desc->hw_desc;
struct iop13xx_adma_desc_ctrl desc_ctrl = hw_desc->desc_ctrl_field;
struct iop13xx_adma_byte_count byte_count = hw_desc->byte_count_field;
+ enum sum_check_flags flags;
BUG_ON(!(byte_count.tx_complete && desc_ctrl.zero_result));
- if (desc_ctrl.pq_xfer_en)
- return byte_count.zero_result_err_q;
- else
- return byte_count.zero_result_err;
+ flags = byte_count.zero_result_err_q << SUM_CHECK_Q;
+ flags |= byte_count.zero_result_err << SUM_CHECK_P;
+
+ return flags;
}
static inline void iop_chan_append(struct iop_adma_chan *chan)
diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c
index 0a56fae..d1a084e 100644
--- a/crypto/async_tx/async_xor.c
+++ b/crypto/async_tx/async_xor.c
@@ -238,7 +238,7 @@ static int page_is_zero(struct page *p, unsigned int offset, size_t len)
struct dma_async_tx_descriptor *
async_xor_zero_sum(struct page *dest, struct page **src_list,
unsigned int offset, int src_cnt, size_t len,
- u32 *result, enum async_tx_flags flags,
+ enum sum_check_flags *result, enum async_tx_flags flags,
struct dma_async_tx_descriptor *depend_tx,
dma_async_tx_callback cb_fn, void *cb_param)
{
@@ -289,7 +289,7 @@ async_xor_zero_sum(struct page *dest, struct page **src_list,
async_tx_quiesce(&tx);
- *result = page_is_zero(dest, offset, len) ? 0 : 1;
+ *result = !page_is_zero(dest, offset, len) << SUM_CHECK_P;
async_tx_sync_epilog(cb_fn, cb_param);
}
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 21626cc..a102337 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -2521,7 +2521,7 @@ static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh,
* we are done. Otherwise update the mismatch count and repair
* parity if !MD_RECOVERY_CHECK
*/
- if (sh->ops.zero_sum_result == 0)
+ if ((sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) == 0)
/* parity is correct (on disc,
* not in buffer any more)
*/
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 2934ee0..cfb5006 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -2,6 +2,7 @@
#define _RAID5_H
#include <linux/raid/xor.h>
+#include <linux/dmaengine.h>
/*
*
@@ -213,8 +214,8 @@ struct stripe_head {
* @target - STRIPE_OP_COMPUTE_BLK target
*/
struct stripe_operations {
- int target;
- u32 zero_sum_result;
+ int target;
+ enum sum_check_flags zero_sum_result;
} ops;
struct r5dev {
struct bio req;
diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h
index 5fc2ef8..6370f32 100644
--- a/include/linux/async_tx.h
+++ b/include/linux/async_tx.h
@@ -119,7 +119,7 @@ async_xor(struct page *dest, struct page **src_list, unsigned int offset,
struct dma_async_tx_descriptor *
async_xor_zero_sum(struct page *dest, struct page **src_list,
unsigned int offset, int src_cnt, size_t len,
- u32 *result, enum async_tx_flags flags,
+ enum sum_check_flags *result, enum async_tx_flags flags,
struct dma_async_tx_descriptor *depend_tx,
dma_async_tx_callback cb_fn, void *cb_fn_param);
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 1956c8d..cd17392 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -90,6 +90,25 @@ enum dma_ctrl_flags {
};
/**
+ * enum sum_check_bits - bit position of pq_check_flags
+ */
+enum sum_check_bits {
+ SUM_CHECK_P = 0,
+ SUM_CHECK_Q = 1,
+};
+
+/**
+ * enum pq_check_flags - result of async_{xor,pq}_zero_sum operations
+ * @SUM_CHECK_P_RESULT - 1 if xor zero sum error, 0 otherwise
+ * @SUM_CHECK_Q_RESULT - 1 if reed-solomon zero sum error, 0 otherwise
+ */
+enum sum_check_flags {
+ SUM_CHECK_P_RESULT = (1 << SUM_CHECK_P),
+ SUM_CHECK_Q_RESULT = (1 << SUM_CHECK_Q),
+};
+
+
+/**
* dma_cap_mask_t - capabilities bitmap modeled after cpumask_t.
* See linux/cpumask.h
*/
@@ -246,7 +265,7 @@ struct dma_device {
unsigned int src_cnt, size_t len, unsigned long flags);
struct dma_async_tx_descriptor *(*device_prep_dma_zero_sum)(
struct dma_chan *chan, dma_addr_t *src, unsigned int src_cnt,
- size_t len, u32 *result, unsigned long flags);
+ size_t len, enum sum_check_flags *result, unsigned long flags);
struct dma_async_tx_descriptor *(*device_prep_dma_memset)(
struct dma_chan *chan, dma_addr_t dest, int value, size_t len,
unsigned long flags);
--
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