From: "Matthew R. Ochs" <mrochs@linux.vnet.ibm.com>
To: linux-scsi@vger.kernel.org,
James Bottomley <James.Bottomley@HansenPartnership.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Uma Krishnan <ukrishn@linux.vnet.ibm.com>,
"Manoj N. Kumar" <manoj@linux.vnet.ibm.com>,
Al Viro <viro@zeniv.linux.org.uk>
Cc: Brian King <brking@linux.vnet.ibm.com>,
linuxppc-dev@lists.ozlabs.org, Ian Munsie <imunsie@au1.ibm.com>,
Andrew Donnellan <andrew.donnellan@au1.ibm.com>,
Frederic Barrat <fbarrat@linux.vnet.ibm.com>,
Christophe Lombard <clombard@linux.vnet.ibm.com>,
"Matthew R. Ochs" <mrochs@linux.vnet.ibm.com>
Subject: [PATCH 5/6] cxlflash: Remove adapter file descriptor cache
Date: Tue, 9 Aug 2016 18:40:02 -0500 [thread overview]
Message-ID: <1470786002-9342-1-git-send-email-mrochs@linux.vnet.ibm.com> (raw)
In-Reply-To: <1470785888-9112-1-git-send-email-mrochs@linux.vnet.ibm.com>
The adapter file descriptor was previously cached within the kernel
for a given context in order to support performing a close on behalf
of an application. This is no longer needed as applications are now
required to perform a close on the adapter file descriptor.
Inspired-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
---
drivers/scsi/cxlflash/superpipe.c | 26 +++++++++++++-------------
drivers/scsi/cxlflash/superpipe.h | 1 -
2 files changed, 13 insertions(+), 14 deletions(-)
diff --git a/drivers/scsi/cxlflash/superpipe.c b/drivers/scsi/cxlflash/superpipe.c
index b3bb90d..c91fe6f 100644
--- a/drivers/scsi/cxlflash/superpipe.c
+++ b/drivers/scsi/cxlflash/superpipe.c
@@ -788,20 +788,18 @@ err:
* @cfg: Internal structure associated with the host.
* @ctx: Previously obtained CXL context reference.
* @ctxid: Previously obtained process element associated with CXL context.
- * @adap_fd: Previously obtained adapter fd associated with CXL context.
* @file: Previously obtained file associated with CXL context.
* @perms: User-specified permissions.
*/
static void init_context(struct ctx_info *ctxi, struct cxlflash_cfg *cfg,
- struct cxl_context *ctx, int ctxid, int adap_fd,
- struct file *file, u32 perms)
+ struct cxl_context *ctx, int ctxid, struct file *file,
+ u32 perms)
{
struct afu *afu = cfg->afu;
ctxi->rht_perms = perms;
ctxi->ctrl_map = &afu->afu_map->ctrls[ctxid].ctrl;
ctxi->ctxid = ENCODE_CTXID(ctxi, ctxid);
- ctxi->lfd = adap_fd;
ctxi->pid = current->tgid; /* tgid = pid */
ctxi->ctx = ctx;
ctxi->cfg = cfg;
@@ -1086,8 +1084,7 @@ static int cxlflash_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
goto err;
}
- dev_dbg(dev, "%s: fault(%d) for context %d\n",
- __func__, ctxi->lfd, ctxid);
+ dev_dbg(dev, "%s: fault for context %d\n", __func__, ctxid);
if (likely(!ctxi->err_recovery_active)) {
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
@@ -1162,8 +1159,7 @@ static int cxlflash_cxl_mmap(struct file *file, struct vm_area_struct *vma)
goto out;
}
- dev_dbg(dev, "%s: mmap(%d) for context %d\n",
- __func__, ctxi->lfd, ctxid);
+ dev_dbg(dev, "%s: mmap for context %d\n", __func__, ctxid);
rc = cxl_fd_mmap(file, vma);
if (likely(!rc)) {
@@ -1406,7 +1402,7 @@ static int cxlflash_disk_attach(struct scsi_device *sdev,
perms = SISL_RHT_PERM(attach->hdr.flags + 1);
/* Context mutex is locked upon return */
- init_context(ctxi, cfg, ctx, ctxid, fd, file, perms);
+ init_context(ctxi, cfg, ctx, ctxid, file, perms);
rc = afu_attach(cfg, ctxi);
if (unlikely(rc)) {
@@ -1488,12 +1484,15 @@ err:
* recover_context() - recovers a context in error
* @cfg: Internal structure associated with the host.
* @ctxi: Context to release.
+ * @adap_fd: Adapter file descriptor associated with new/recovered context.
*
* Restablishes the state for a context-in-error.
*
* Return: 0 on success, -errno on failure
*/
-static int recover_context(struct cxlflash_cfg *cfg, struct ctx_info *ctxi)
+static int recover_context(struct cxlflash_cfg *cfg,
+ struct ctx_info *ctxi,
+ int *adap_fd)
{
struct device *dev = &cfg->dev->dev;
int rc = 0;
@@ -1546,7 +1545,6 @@ static int recover_context(struct cxlflash_cfg *cfg, struct ctx_info *ctxi)
* visible to user space and can't be undone safely on this thread.
*/
ctxi->ctxid = ENCODE_CTXID(ctxi, ctxid);
- ctxi->lfd = fd;
ctxi->ctx = ctx;
ctxi->file = file;
@@ -1563,6 +1561,7 @@ static int recover_context(struct cxlflash_cfg *cfg, struct ctx_info *ctxi)
cfg->ctx_tbl[ctxid] = ctxi;
mutex_unlock(&cfg->ctx_tbl_list_mutex);
fd_install(fd, file);
+ *adap_fd = fd;
out:
dev_dbg(dev, "%s: returning ctxid=%d fd=%d rc=%d\n",
__func__, ctxid, fd, rc);
@@ -1621,6 +1620,7 @@ static int cxlflash_afu_recover(struct scsi_device *sdev,
rctxid = recover->context_id;
long reg;
int lretry = 20; /* up to 2 seconds */
+ int new_adap_fd = -1;
int rc = 0;
atomic_inc(&cfg->recovery_threads);
@@ -1650,7 +1650,7 @@ retry:
if (ctxi->err_recovery_active) {
retry_recover:
- rc = recover_context(cfg, ctxi);
+ rc = recover_context(cfg, ctxi, &new_adap_fd);
if (unlikely(rc)) {
dev_err(dev, "%s: Recovery failed for context %llu (rc=%d)\n",
__func__, ctxid, rc);
@@ -1672,7 +1672,7 @@ retry_recover:
ctxi->err_recovery_active = false;
recover->context_id = ctxi->ctxid;
- recover->adap_fd = ctxi->lfd;
+ recover->adap_fd = new_adap_fd;
recover->mmio_size = sizeof(afu->afu_map->hosts[0].harea);
recover->hdr.return_flags = DK_CXLFLASH_APP_CLOSE_ADAP_FD |
DK_CXLFLASH_RECOVER_AFU_CONTEXT_RESET;
diff --git a/drivers/scsi/cxlflash/superpipe.h b/drivers/scsi/cxlflash/superpipe.h
index 5bda8b5..9e62ff3 100644
--- a/drivers/scsi/cxlflash/superpipe.h
+++ b/drivers/scsi/cxlflash/superpipe.h
@@ -100,7 +100,6 @@ struct ctx_info {
struct cxl_ioctl_start_work work;
u64 ctxid;
- int lfd;
pid_t pid;
bool initialized;
bool unavail;
--
2.1.0
next prev parent reply other threads:[~2016-08-09 23:40 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-09 23:38 [PATCH 0/6] cxlflash: Improvements and cleanup Matthew R. Ochs
2016-08-09 23:39 ` [PATCH 1/6] cxlflash: Avoid mutex when destroying context Matthew R. Ochs
2016-08-17 23:22 ` Manoj Kumar
2016-08-09 23:39 ` [PATCH 2/6] cxlflash: Cache owning adapter within context Matthew R. Ochs
2016-08-18 14:38 ` Manoj Kumar
2016-08-09 23:39 ` [PATCH 3/6] cxlflash: Add kref to context Matthew R. Ochs
2016-08-18 18:38 ` Manoj Kumar
2016-08-09 23:39 ` [PATCH 4/6] cxlflash: Transition to application close model Matthew R. Ochs
2016-08-19 3:53 ` Manoj Kumar
2016-08-24 2:25 ` Martin K. Petersen
2016-08-09 23:40 ` Matthew R. Ochs [this message]
2016-08-19 12:18 ` [PATCH 5/6] cxlflash: Remove adapter file descriptor cache Manoj Kumar
2016-08-09 23:40 ` [PATCH 6/6] cxlflash: Update documentation Matthew R. Ochs
2016-08-19 12:18 ` Manoj Kumar
2016-08-19 2:43 ` [PATCH 0/6] cxlflash: Improvements and cleanup Martin K. Petersen
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