From: Ming Lei <ming.lei@redhat.com> To: linux-scsi@vger.kernel.org, "Martin K . Petersen" <martin.petersen@oracle.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com>, Bart Van Assche <bvanassche@acm.org>, Hannes Reinecke <hare@suse.com>, Christoph Hellwig <hch@lst.de>, Jim Gill <jgill@vmware.com>, Cathy Avery <cavery@redhat.com>, "Ewan D . Milne" <emilne@redhat.com>, Brian King <brking@us.ibm.com>, James Smart <james.smart@broadcom.com>, "Juergen E . Fischer" <fischer@norbit.de>, Michael Schmitz <schmitzmic@gmail.com>, Finn Thain <fthain@telegraphics.com.au>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, devel@driverdev.osuosl.org, linux-usb@vger.kernel.org, Dan Carpenter <dan.carpenter@oracle.com>, Benjamin Block <bblock@linux.ibm.com> Subject: [PATCH V5 16/16] NCR5380: Support chained sg lists Date: Tue, 18 Jun 2019 09:37:57 +0800 [thread overview] Message-ID: <20190618013757.22401-17-ming.lei@redhat.com> (raw) In-Reply-To: <20190618013757.22401-1-ming.lei@redhat.com> From: Finn Thain <fthain@telegraphics.com.au> My understanding is that support for chained scatterlists is to become mandatory for LLDs. Use the scatterlist iterators and remove direct indexing of the scatterlist array. This way allows us to pre-allocate one small scatterlist, which can be chained with one runtime allocated scatterlist if the pre-allocated one isn't enough for the whole request. Cc: Michael Schmitz <schmitzmic@gmail.com> Reviewed-by: Michael Schmitz <schmitzmic@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Finn Thain <fthain@telegraphics.com.au> --- drivers/scsi/NCR5380.c | 41 ++++++++++++++++++----------------------- 1 file changed, 18 insertions(+), 23 deletions(-) diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c index fe0535affc14..4ef44fafe6ca 100644 --- a/drivers/scsi/NCR5380.c +++ b/drivers/scsi/NCR5380.c @@ -149,12 +149,10 @@ static inline void initialize_SCp(struct scsi_cmnd *cmd) if (scsi_bufflen(cmd)) { cmd->SCp.buffer = scsi_sglist(cmd); - cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); cmd->SCp.this_residual = cmd->SCp.buffer->length; } else { cmd->SCp.buffer = NULL; - cmd->SCp.buffers_residual = 0; cmd->SCp.ptr = NULL; cmd->SCp.this_residual = 0; } @@ -163,6 +161,17 @@ static inline void initialize_SCp(struct scsi_cmnd *cmd) cmd->SCp.Message = 0; } +static inline void advance_sg_buffer(struct scsi_cmnd *cmd) +{ + struct scatterlist *s = cmd->SCp.buffer; + + if (!cmd->SCp.this_residual && s && !sg_is_last(s)) { + cmd->SCp.buffer = sg_next(s); + cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); + cmd->SCp.this_residual = cmd->SCp.buffer->length; + } +} + /** * NCR5380_poll_politely2 - wait for two chip register values * @hostdata: host private data @@ -1672,12 +1681,7 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) sun3_dma_setup_done != cmd) { int count; - if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { - ++cmd->SCp.buffer; - --cmd->SCp.buffers_residual; - cmd->SCp.this_residual = cmd->SCp.buffer->length; - cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); - } + advance_sg_buffer(cmd); count = sun3scsi_dma_xfer_len(hostdata, cmd); @@ -1727,15 +1731,11 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) * scatter-gather list, move onto the next one. */ - if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { - ++cmd->SCp.buffer; - --cmd->SCp.buffers_residual; - cmd->SCp.this_residual = cmd->SCp.buffer->length; - cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); - dsprintk(NDEBUG_INFORMATION, instance, "%d bytes and %d buffers left\n", - cmd->SCp.this_residual, - cmd->SCp.buffers_residual); - } + advance_sg_buffer(cmd); + dsprintk(NDEBUG_INFORMATION, instance, + "this residual %d, sg ents %d\n", + cmd->SCp.this_residual, + sg_nents(cmd->SCp.buffer)); /* * The preferred transfer method is going to be @@ -2136,12 +2136,7 @@ static void NCR5380_reselect(struct Scsi_Host *instance) if (sun3_dma_setup_done != tmp) { int count; - if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) { - ++tmp->SCp.buffer; - --tmp->SCp.buffers_residual; - tmp->SCp.this_residual = tmp->SCp.buffer->length; - tmp->SCp.ptr = sg_virt(tmp->SCp.buffer); - } + advance_sg_buffer(tmp); count = sun3scsi_dma_xfer_len(hostdata, tmp); -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Ming Lei <ming.lei@redhat.com> To: linux-scsi@vger.kernel.org, "Martin K . Petersen" <martin.petersen@oracle.com> Cc: Michael Schmitz <schmitzmic@gmail.com>, devel@driverdev.osuosl.org, Hannes Reinecke <hare@suse.com>, Benjamin Block <bblock@linux.ibm.com>, Bart Van Assche <bvanassche@acm.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, linux-usb@vger.kernel.org, James Smart <james.smart@broadcom.com>, "Ewan D . Milne" <emilne@redhat.com>, Jim Gill <jgill@vmware.com>, James Bottomley <James.Bottomley@HansenPartnership.com>, Brian King <brking@us.ibm.com>, Finn Thain <fthain@telegraphics.com.au>, "Juergen E . Fischer" <fischer@norbit.de>, Christoph Hellwig <hch@lst.de>, Dan Carpenter <dan.carpenter@oracle.com> Subject: [PATCH V5 16/16] NCR5380: Support chained sg lists Date: Tue, 18 Jun 2019 09:37:57 +0800 [thread overview] Message-ID: <20190618013757.22401-17-ming.lei@redhat.com> (raw) In-Reply-To: <20190618013757.22401-1-ming.lei@redhat.com> From: Finn Thain <fthain@telegraphics.com.au> My understanding is that support for chained scatterlists is to become mandatory for LLDs. Use the scatterlist iterators and remove direct indexing of the scatterlist array. This way allows us to pre-allocate one small scatterlist, which can be chained with one runtime allocated scatterlist if the pre-allocated one isn't enough for the whole request. Cc: Michael Schmitz <schmitzmic@gmail.com> Reviewed-by: Michael Schmitz <schmitzmic@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Finn Thain <fthain@telegraphics.com.au> --- drivers/scsi/NCR5380.c | 41 ++++++++++++++++++----------------------- 1 file changed, 18 insertions(+), 23 deletions(-) diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c index fe0535affc14..4ef44fafe6ca 100644 --- a/drivers/scsi/NCR5380.c +++ b/drivers/scsi/NCR5380.c @@ -149,12 +149,10 @@ static inline void initialize_SCp(struct scsi_cmnd *cmd) if (scsi_bufflen(cmd)) { cmd->SCp.buffer = scsi_sglist(cmd); - cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); cmd->SCp.this_residual = cmd->SCp.buffer->length; } else { cmd->SCp.buffer = NULL; - cmd->SCp.buffers_residual = 0; cmd->SCp.ptr = NULL; cmd->SCp.this_residual = 0; } @@ -163,6 +161,17 @@ static inline void initialize_SCp(struct scsi_cmnd *cmd) cmd->SCp.Message = 0; } +static inline void advance_sg_buffer(struct scsi_cmnd *cmd) +{ + struct scatterlist *s = cmd->SCp.buffer; + + if (!cmd->SCp.this_residual && s && !sg_is_last(s)) { + cmd->SCp.buffer = sg_next(s); + cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); + cmd->SCp.this_residual = cmd->SCp.buffer->length; + } +} + /** * NCR5380_poll_politely2 - wait for two chip register values * @hostdata: host private data @@ -1672,12 +1681,7 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) sun3_dma_setup_done != cmd) { int count; - if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { - ++cmd->SCp.buffer; - --cmd->SCp.buffers_residual; - cmd->SCp.this_residual = cmd->SCp.buffer->length; - cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); - } + advance_sg_buffer(cmd); count = sun3scsi_dma_xfer_len(hostdata, cmd); @@ -1727,15 +1731,11 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) * scatter-gather list, move onto the next one. */ - if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { - ++cmd->SCp.buffer; - --cmd->SCp.buffers_residual; - cmd->SCp.this_residual = cmd->SCp.buffer->length; - cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); - dsprintk(NDEBUG_INFORMATION, instance, "%d bytes and %d buffers left\n", - cmd->SCp.this_residual, - cmd->SCp.buffers_residual); - } + advance_sg_buffer(cmd); + dsprintk(NDEBUG_INFORMATION, instance, + "this residual %d, sg ents %d\n", + cmd->SCp.this_residual, + sg_nents(cmd->SCp.buffer)); /* * The preferred transfer method is going to be @@ -2136,12 +2136,7 @@ static void NCR5380_reselect(struct Scsi_Host *instance) if (sun3_dma_setup_done != tmp) { int count; - if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) { - ++tmp->SCp.buffer; - --tmp->SCp.buffers_residual; - tmp->SCp.this_residual = tmp->SCp.buffer->length; - tmp->SCp.ptr = sg_virt(tmp->SCp.buffer); - } + advance_sg_buffer(tmp); count = sun3scsi_dma_xfer_len(hostdata, tmp); -- 2.20.1
next prev parent reply other threads:[~2019-06-18 1:39 UTC|newest] Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-06-18 1:37 [PATCH V5 00/16] use sg helper to operate scatterlist Ming Lei 2019-06-18 1:37 ` Ming Lei 2019-06-18 1:37 ` [PATCH V5 01/16] scsi: vmw_pscsi: " Ming Lei 2019-06-18 1:37 ` Ming Lei 2019-06-18 1:37 ` [PATCH V5 02/16] scsi: advansys: " Ming Lei 2019-06-18 1:37 ` Ming Lei 2019-06-18 1:37 ` [PATCH V5 03/16] scsi: lpfc: " Ming Lei 2019-06-18 1:37 ` Ming Lei 2019-06-18 1:37 ` [PATCH V5 04/16] scsi: mvumi: " Ming Lei 2019-06-18 1:37 ` Ming Lei 2019-06-18 1:37 ` [PATCH V5 05/16] scsi: ipr: " Ming Lei 2019-06-18 1:37 ` Ming Lei 2019-06-18 1:37 ` [PATCH V5 06/16] scsi: pmcraid: " Ming Lei 2019-06-18 1:37 ` Ming Lei 2019-06-18 1:37 ` [PATCH V5 07/16] usb: image: microtek: " Ming Lei 2019-06-18 1:37 ` Ming Lei 2019-06-18 1:37 ` [PATCH V5 08/16] staging: unisys: visorhba: " Ming Lei 2019-06-18 1:37 ` Ming Lei 2019-06-18 1:37 ` [PATCH V5 09/16] staging: rtsx: " Ming Lei 2019-06-18 1:37 ` Ming Lei 2019-06-18 1:37 ` [PATCH V5 10/16] s390: zfcp_fc: " Ming Lei 2019-06-18 1:37 ` Ming Lei 2019-06-24 15:13 ` Steffen Maier 2019-06-24 15:13 ` Steffen Maier 2019-06-25 1:19 ` Ming Lei 2019-06-25 1:19 ` Ming Lei 2019-06-25 2:01 ` Finn Thain 2019-06-25 2:01 ` Finn Thain 2019-06-25 2:30 ` Ming Lei 2019-06-25 2:30 ` Ming Lei 2019-06-25 3:42 ` Finn Thain 2019-06-25 3:42 ` Finn Thain 2019-06-25 10:51 ` Steffen Maier 2019-06-25 10:51 ` Steffen Maier 2019-06-26 3:07 ` Ming Lei 2019-06-26 3:07 ` Ming Lei 2019-06-26 8:17 ` Steffen Maier 2019-06-26 8:17 ` Steffen Maier 2019-06-18 1:37 ` [PATCH V5 11/16] scsi: aha152x: " Ming Lei 2019-06-18 1:37 ` Ming Lei 2019-06-18 3:54 ` Finn Thain 2019-06-18 3:54 ` Finn Thain 2019-06-18 1:37 ` [PATCH V5 12/16] scsi: imm: " Ming Lei 2019-06-18 1:37 ` Ming Lei 2019-06-18 1:37 ` [PATCH V5 13/16] scsi: pcmcia: nsp_cs: " Ming Lei 2019-06-18 1:37 ` Ming Lei 2019-06-18 1:37 ` [PATCH V5 14/16] scsi: ppa: " Ming Lei 2019-06-18 1:37 ` Ming Lei 2019-06-18 1:37 ` [PATCH V5 15/16] scsi: wd33c93: " Ming Lei 2019-06-18 1:37 ` Ming Lei 2019-06-18 1:37 ` Ming Lei [this message] 2019-06-18 1:37 ` [PATCH V5 16/16] NCR5380: Support chained sg lists Ming Lei 2019-06-19 0:29 ` [PATCH V5 00/16] use sg helper to operate scatterlist Martin K. Petersen 2019-06-19 0:29 ` Martin K. Petersen 2019-06-19 0:29 ` Martin K. Petersen 2019-06-19 19:43 ` Bart Van Assche 2019-06-19 19:43 ` Bart Van Assche 2019-06-19 19:55 ` Martin K. Petersen 2019-06-19 19:55 ` Martin K. Petersen 2019-06-19 19:55 ` Martin K. Petersen 2019-06-24 12:40 ` Ming Lei 2019-06-24 12:40 ` Ming Lei 2019-06-24 12:54 ` Martin K. Petersen 2019-06-24 12:54 ` Martin K. Petersen 2019-06-24 12:54 ` Martin K. Petersen
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