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s390/pci: Recover handle in clp_set_pci_fn()

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When we try to recover a PCI function using

    echo 1 > /sys/bus/pci/devices/<id>/recover

or manually with

    echo 1 > /sys/bus/pci/devices/<id>/remove
    echo 0 > /sys/bus/pci/slots/<slot>/power
    echo 1 > /sys/bus/pci/slots/<slot>/power

clp_disable_fn() / clp_enable_fn() call clp_set_pci_fn() to first
disable and then reenable the function.

When the function is already in the requested state we may be left with
an invalid function handle.

To get a new valid handle we do a clp_list_pci() call. For this we need
both the function ID and function handle in clp_set_pci_fn() so pass the
zdev and get both.

To simplify things also pull setting the refreshed function handle into
clp_set_pci_fn()

Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Niklas Schnelle 2019-12-17 09:34:46 +01:00 committed by Vasily Gorbik
parent d1eef1c619
commit 17cdec960c
3 changed files with 31 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/s390/include/asm/pci.h
View File

@ -180,7 +180,7 @@ void zpci_remove_reserved_devices(void);
/* CLP */
int clp_scan_pci_devices(void);
int clp_rescan_pci_devices(void);
int clp_rescan_pci_devices_simple(void);
int clp_rescan_pci_devices_simple(u32 *fid);
int clp_add_pci_device(u32, u32, int);
int clp_enable_fh(struct zpci_dev *, u8);
int clp_disable_fh(struct zpci_dev *);

2
arch/s390/pci/pci.c
View File

@ -939,5 +939,5 @@ subsys_initcall_sync(pci_base_init);
void zpci_rescan(void)
{
if (zpci_is_enabled())
clp_rescan_pci_devices_simple();
clp_rescan_pci_devices_simple(NULL);
}

48
arch/s390/pci/pci_clp.c
View File

@ -240,12 +240,14 @@ error:
}
/*
* Enable/Disable a given PCI function defined by its function handle.
* Enable/Disable a given PCI function and update its function handle if
* necessary
*/
static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
static int clp_set_pci_fn(struct zpci_dev *zdev, u8 nr_dma_as, u8 command)
{
struct clp_req_rsp_set_pci *rrb;
int rc, retries = 100;
u32 fid = zdev->fid;
rrb = clp_alloc_block(GFP_KERNEL);
if (!rrb)
@ -256,7 +258,7 @@ static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
rrb->request.hdr.len = sizeof(rrb->request);
rrb->request.hdr.cmd = CLP_SET_PCI_FN;
rrb->response.hdr.len = sizeof(rrb->response);
rrb->request.fh = *fh;
rrb->request.fh = zdev->fh;
rrb->request.oc = command;
rrb->request.ndas = nr_dma_as;
@ -269,12 +271,17 @@ static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
}
} while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
*fh = rrb->response.fh;
else {
if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
zpci_err("Set PCI FN:\n");
zpci_err_clp(rrb->response.hdr.rsp, rc);
rc = -EIO;
}
if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
zdev->fh = rrb->response.fh;
} else if (!rc && rrb->response.hdr.rsp == CLP_RC_SETPCIFN_ALRDY &&
rrb->response.fh == 0) {
/* Function is already in desired state - update handle */
rc = clp_rescan_pci_devices_simple(&fid);
}
clp_free_block(rrb);
return rc;
@ -282,18 +289,17 @@ static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
{
u32 fh = zdev->fh;
int rc;
rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc);
rc = clp_set_pci_fn(zdev, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
if (rc)
goto out;
zdev->fh = fh;
if (zpci_use_mio(zdev)) {
rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_MIO);
zpci_dbg(3, "ena mio fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc);
rc = clp_set_pci_fn(zdev, nr_dma_as, CLP_SET_ENABLE_MIO);
zpci_dbg(3, "ena mio fid:%x, fh:%x, rc:%d\n",
zdev->fid, zdev->fh, rc);
if (rc)
clp_disable_fh(zdev);
}
@ -309,11 +315,8 @@ int clp_disable_fh(struct zpci_dev *zdev)
if (!zdev_enabled(zdev))
return 0;
rc = clp_set_pci_fn(&fh, 0, CLP_SET_DISABLE_PCI_FN);
rc = clp_set_pci_fn(zdev, 0, CLP_SET_DISABLE_PCI_FN);
zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc);
if (!rc)
zdev->fh = fh;
return rc;
}
@ -370,10 +373,14 @@ static void __clp_add(struct clp_fh_list_entry *entry, void *data)
static void __clp_update(struct clp_fh_list_entry *entry, void *data)
{
struct zpci_dev *zdev;
u32 *fid = data;
if (!entry->vendor_id)
return;
if (fid && *fid != entry->fid)
return;
zdev = get_zdev_by_fid(entry->fid);
if (!zdev)
return;
@ -413,7 +420,10 @@ int clp_rescan_pci_devices(void)
return rc;
}
int clp_rescan_pci_devices_simple(void)
/* Rescan PCI functions and refresh function handles. If fid is non-NULL only
* refresh the handle of the function matching @fid
*/
int clp_rescan_pci_devices_simple(u32 *fid)
{
struct clp_req_rsp_list_pci *rrb;
int rc;
@ -422,7 +432,7 @@ int clp_rescan_pci_devices_simple(void)
if (!rrb)
return -ENOMEM;
rc = clp_list_pci(rrb, NULL, __clp_update);
rc = clp_list_pci(rrb, fid, __clp_update);
clp_free_block(rrb);
return rc;