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authorJan Glauber <jang@linux.vnet.ibm.com>2012-11-29 14:35:47 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-11-30 17:47:25 +0100
commit7441b0627e2251370902305a204e1330a696ca04 (patch)
treed3a36466a8517f8b889b6f0037f15280e33302d4 /drivers/s390/char
parentcbc0dd1f856b52b59c2c73a477b6cb210c8c66ad (diff)
s390/pci: PCI hotplug support via SCLP
Add SCLP PCI configure/deconfigure and implement a PCI hotplug controller (s390_pci_hpc). The hotplug controller creates a slot for every PCI function in stand-by or configured state. The PCI functions are named after the PCI function ID (fid). By writing to the power attribute in /sys/bus/pci/slots/<fid>/power the PCI function is moved to stand-by or configured state. If moved to the configured state the device is automatically scanned by the s390 PCI layer. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/char')
-rw-r--r--drivers/s390/char/sclp.h3
-rw-r--r--drivers/s390/char/sclp_cmd.c64
2 files changed, 65 insertions, 2 deletions
diff --git a/drivers/s390/char/sclp.h b/drivers/s390/char/sclp.h
index d7e97ae9ef6d..25bcd4c0ed82 100644
--- a/drivers/s390/char/sclp.h
+++ b/drivers/s390/char/sclp.h
@@ -1,5 +1,5 @@
/*
- * Copyright IBM Corp. 1999, 2009
+ * Copyright IBM Corp. 1999,2012
*
* Author(s): Martin Peschke <mpeschke@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
@@ -103,6 +103,7 @@ extern u64 sclp_facilities;
#define SCLP_HAS_CHP_RECONFIG (sclp_facilities & 0x2000000000000000ULL)
#define SCLP_HAS_CPU_INFO (sclp_facilities & 0x0800000000000000ULL)
#define SCLP_HAS_CPU_RECONFIG (sclp_facilities & 0x0400000000000000ULL)
+#define SCLP_HAS_PCI_RECONFIG (sclp_facilities & 0x0000000040000000ULL)
struct gds_subvector {
diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c
index 0dfa88a30118..c44d13f607bc 100644
--- a/drivers/s390/char/sclp_cmd.c
+++ b/drivers/s390/char/sclp_cmd.c
@@ -1,5 +1,5 @@
/*
- * Copyright IBM Corp. 2007, 2009
+ * Copyright IBM Corp. 2007,2012
*
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
@@ -12,6 +12,7 @@
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/err.h>
+#include <linux/export.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/mm.h>
@@ -701,6 +702,67 @@ __initcall(sclp_detect_standby_memory);
#endif /* CONFIG_MEMORY_HOTPLUG */
/*
+ * PCI I/O adapter configuration related functions.
+ */
+#define SCLP_CMDW_CONFIGURE_PCI 0x001a0001
+#define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001
+
+#define SCLP_RECONFIG_PCI_ATPYE 2
+
+struct pci_cfg_sccb {
+ struct sccb_header header;
+ u8 atype; /* adapter type */
+ u8 reserved1;
+ u16 reserved2;
+ u32 aid; /* adapter identifier */
+} __packed;
+
+static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
+{
+ struct pci_cfg_sccb *sccb;
+ int rc;
+
+ if (!SCLP_HAS_PCI_RECONFIG)
+ return -EOPNOTSUPP;
+
+ sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
+ if (!sccb)
+ return -ENOMEM;
+
+ sccb->header.length = PAGE_SIZE;
+ sccb->atype = SCLP_RECONFIG_PCI_ATPYE;
+ sccb->aid = fid;
+ rc = do_sync_request(cmd, sccb);
+ if (rc)
+ goto out;
+ switch (sccb->header.response_code) {
+ case 0x0020:
+ case 0x0120:
+ break;
+ default:
+ pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n",
+ cmd, sccb->header.response_code);
+ rc = -EIO;
+ break;
+ }
+out:
+ free_page((unsigned long) sccb);
+ return rc;
+}
+
+int sclp_pci_configure(u32 fid)
+{
+ return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
+}
+EXPORT_SYMBOL(sclp_pci_configure);
+
+int sclp_pci_deconfigure(u32 fid)
+{
+ return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
+}
+EXPORT_SYMBOL(sclp_pci_deconfigure);
+
+/*
* Channel path configuration related functions.
*/