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Groups > linux.kernel > #1394480

[PATCH 4/4] lightnvm: Precalculate max/min sectors per req.

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Add two precalculated values to nvm_rq: (i) maximum number of sectors
per general request; and (ii) minimum number of sectors per write
request.

Signed-off-by: Javier González <javier@cnexlabs.com>
---
 drivers/lightnvm/core.c  | 3 +++
 include/linux/lightnvm.h | 4 +++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 4cd9803..85682d91 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -573,6 +573,9 @@ static int nvm_core_init(struct nvm_dev *dev)
 
 	dev->plane_mode = NVM_PLANE_SINGLE;
 	dev->max_rq_size = dev->ops->max_phys_sect * dev->sec_size;
+	dev->max_sec_rq = dev->ops->max_phys_sect;
+	/* assume max_phys_sect % dev->min_write_pgs == 0 */
+	dev->min_sec_w_rq = dev->sec_per_pl * (dev->sec_size / PAGE_SIZE);
 
 	if (grp->mpos & 0x020202)
 		dev->plane_mode = NVM_PLANE_DOUBLE;
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index 67e72f5..c2dfd0c 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -351,7 +351,9 @@ struct nvm_dev {
 	/* Calculated/Cached values. These do not reflect the actual usable
 	 * blocks at run-time.
 	 */
-	int max_rq_size;
+	int max_rq_size; /* maximum size of a single request */
+	int max_sec_rq; /* maximum amount of sectors that fit in one req. */
+	int min_sec_w_rq; /* minimum amount of sectors required on write req. */
 	int plane_mode; /* drive device in single, double or quad mode */
 
 	int sec_per_pl; /* all sectors across planes */
-- 
2.5.0

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[PATCH 1/4] lightnvm: add sync and close block I/O types "Javier González" <jg@lightnvm.io> - 2016-05-04 17:40 +0200
  [PATCH 4/4] lightnvm: Precalculate max/min sectors per req. "Javier González" <jg@lightnvm.io> - 2016-05-04 17:40 +0200
    Re: [PATCH 4/4] lightnvm: Precalculate max/min sectors per req. Matias Bjørling <mb@lightnvm.io> - 2016-05-05 12:00 +0200
      Re: [PATCH 4/4] lightnvm: Precalculate max/min sectors per req. Javier González <javier@cnexlabs.com> - 2016-05-05 12:20 +0200
  Re: [PATCH 1/4] lightnvm: add sync and close block I/O types Matias Bjørling <mb@lightnvm.io> - 2016-05-05 11:30 +0200
    Re: [PATCH 1/4] lightnvm: add sync and close block I/O types Javier González <jg@lightnvm.io> - 2016-05-05 11:40 +0200
      Re: [PATCH 1/4] lightnvm: add sync and close block I/O types Matias Bjørling <mb@lightnvm.io> - 2016-05-05 12:10 +0200

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