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Diffstat (limited to 'arch/s390/pci/pci_insn.c')
-rw-r--r--arch/s390/pci/pci_insn.c443
1 files changed, 443 insertions, 0 deletions
diff --git a/arch/s390/pci/pci_insn.c b/arch/s390/pci/pci_insn.c
new file mode 100644
index 000000000..56480be48
--- /dev/null
+++ b/arch/s390/pci/pci_insn.c
@@ -0,0 +1,443 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * s390 specific pci instructions
+ *
+ * Copyright IBM Corp. 2013
+ */
+
+#include <linux/export.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/jump_label.h>
+#include <asm/asm-extable.h>
+#include <asm/facility.h>
+#include <asm/pci_insn.h>
+#include <asm/pci_debug.h>
+#include <asm/pci_io.h>
+#include <asm/processor.h>
+
+#define ZPCI_INSN_BUSY_DELAY 1 /* 1 microsecond */
+
+struct zpci_err_insn_data {
+ u8 insn;
+ u8 cc;
+ u8 status;
+ union {
+ struct {
+ u64 req;
+ u64 offset;
+ };
+ struct {
+ u64 addr;
+ u64 len;
+ };
+ };
+} __packed;
+
+static inline void zpci_err_insn_req(int lvl, u8 insn, u8 cc, u8 status,
+ u64 req, u64 offset)
+{
+ struct zpci_err_insn_data data = {
+ .insn = insn, .cc = cc, .status = status,
+ .req = req, .offset = offset};
+
+ zpci_err_hex_level(lvl, &data, sizeof(data));
+}
+
+static inline void zpci_err_insn_addr(int lvl, u8 insn, u8 cc, u8 status,
+ u64 addr, u64 len)
+{
+ struct zpci_err_insn_data data = {
+ .insn = insn, .cc = cc, .status = status,
+ .addr = addr, .len = len};
+
+ zpci_err_hex_level(lvl, &data, sizeof(data));
+}
+
+/* Modify PCI Function Controls */
+static inline u8 __mpcifc(u64 req, struct zpci_fib *fib, u8 *status)
+{
+ u8 cc;
+
+ asm volatile (
+ " .insn rxy,0xe300000000d0,%[req],%[fib]\n"
+ " ipm %[cc]\n"
+ " srl %[cc],28\n"
+ : [cc] "=d" (cc), [req] "+d" (req), [fib] "+Q" (*fib)
+ : : "cc");
+ *status = req >> 24 & 0xff;
+ return cc;
+}
+
+u8 zpci_mod_fc(u64 req, struct zpci_fib *fib, u8 *status)
+{
+ bool retried = false;
+ u8 cc;
+
+ do {
+ cc = __mpcifc(req, fib, status);
+ if (cc == 2) {
+ msleep(ZPCI_INSN_BUSY_DELAY);
+ if (!retried) {
+ zpci_err_insn_req(1, 'M', cc, *status, req, 0);
+ retried = true;
+ }
+ }
+ } while (cc == 2);
+
+ if (cc)
+ zpci_err_insn_req(0, 'M', cc, *status, req, 0);
+ else if (retried)
+ zpci_err_insn_req(1, 'M', cc, *status, req, 0);
+
+ return cc;
+}
+EXPORT_SYMBOL_GPL(zpci_mod_fc);
+
+/* Refresh PCI Translations */
+static inline u8 __rpcit(u64 fn, u64 addr, u64 range, u8 *status)
+{
+ union register_pair addr_range = {.even = addr, .odd = range};
+ u8 cc;
+
+ asm volatile (
+ " .insn rre,0xb9d30000,%[fn],%[addr_range]\n"
+ " ipm %[cc]\n"
+ " srl %[cc],28\n"
+ : [cc] "=d" (cc), [fn] "+d" (fn)
+ : [addr_range] "d" (addr_range.pair)
+ : "cc");
+ *status = fn >> 24 & 0xff;
+ return cc;
+}
+
+int zpci_refresh_trans(u64 fn, u64 addr, u64 range)
+{
+ bool retried = false;
+ u8 cc, status;
+
+ do {
+ cc = __rpcit(fn, addr, range, &status);
+ if (cc == 2) {
+ udelay(ZPCI_INSN_BUSY_DELAY);
+ if (!retried) {
+ zpci_err_insn_addr(1, 'R', cc, status, addr, range);
+ retried = true;
+ }
+ }
+ } while (cc == 2);
+
+ if (cc)
+ zpci_err_insn_addr(0, 'R', cc, status, addr, range);
+ else if (retried)
+ zpci_err_insn_addr(1, 'R', cc, status, addr, range);
+
+ if (cc == 1 && (status == 4 || status == 16))
+ return -ENOMEM;
+
+ return (cc) ? -EIO : 0;
+}
+
+/* Set Interruption Controls */
+int zpci_set_irq_ctrl(u16 ctl, u8 isc, union zpci_sic_iib *iib)
+{
+ if (!test_facility(72))
+ return -EIO;
+
+ asm volatile(
+ ".insn rsy,0xeb00000000d1,%[ctl],%[isc],%[iib]\n"
+ : : [ctl] "d" (ctl), [isc] "d" (isc << 27), [iib] "Q" (*iib));
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(zpci_set_irq_ctrl);
+
+/* PCI Load */
+static inline int ____pcilg(u64 *data, u64 req, u64 offset, u8 *status)
+{
+ union register_pair req_off = {.even = req, .odd = offset};
+ int cc = -ENXIO;
+ u64 __data;
+
+ asm volatile (
+ " .insn rre,0xb9d20000,%[data],%[req_off]\n"
+ "0: ipm %[cc]\n"
+ " srl %[cc],28\n"
+ "1:\n"
+ EX_TABLE(0b, 1b)
+ : [cc] "+d" (cc), [data] "=d" (__data),
+ [req_off] "+&d" (req_off.pair) :: "cc");
+ *status = req_off.even >> 24 & 0xff;
+ *data = __data;
+ return cc;
+}
+
+static inline int __pcilg(u64 *data, u64 req, u64 offset, u8 *status)
+{
+ u64 __data;
+ int cc;
+
+ cc = ____pcilg(&__data, req, offset, status);
+ if (!cc)
+ *data = __data;
+
+ return cc;
+}
+
+int __zpci_load(u64 *data, u64 req, u64 offset)
+{
+ bool retried = false;
+ u8 status;
+ int cc;
+
+ do {
+ cc = __pcilg(data, req, offset, &status);
+ if (cc == 2) {
+ udelay(ZPCI_INSN_BUSY_DELAY);
+ if (!retried) {
+ zpci_err_insn_req(1, 'l', cc, status, req, offset);
+ retried = true;
+ }
+ }
+ } while (cc == 2);
+
+ if (cc)
+ zpci_err_insn_req(0, 'l', cc, status, req, offset);
+ else if (retried)
+ zpci_err_insn_req(1, 'l', cc, status, req, offset);
+
+ return (cc > 0) ? -EIO : cc;
+}
+EXPORT_SYMBOL_GPL(__zpci_load);
+
+static inline int zpci_load_fh(u64 *data, const volatile void __iomem *addr,
+ unsigned long len)
+{
+ struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)];
+ u64 req = ZPCI_CREATE_REQ(READ_ONCE(entry->fh), entry->bar, len);
+
+ return __zpci_load(data, req, ZPCI_OFFSET(addr));
+}
+
+static inline int __pcilg_mio(u64 *data, u64 ioaddr, u64 len, u8 *status)
+{
+ union register_pair ioaddr_len = {.even = ioaddr, .odd = len};
+ int cc = -ENXIO;
+ u64 __data;
+
+ asm volatile (
+ " .insn rre,0xb9d60000,%[data],%[ioaddr_len]\n"
+ "0: ipm %[cc]\n"
+ " srl %[cc],28\n"
+ "1:\n"
+ EX_TABLE(0b, 1b)
+ : [cc] "+d" (cc), [data] "=d" (__data),
+ [ioaddr_len] "+&d" (ioaddr_len.pair) :: "cc");
+ *status = ioaddr_len.odd >> 24 & 0xff;
+ *data = __data;
+ return cc;
+}
+
+int zpci_load(u64 *data, const volatile void __iomem *addr, unsigned long len)
+{
+ u8 status;
+ int cc;
+
+ if (!static_branch_unlikely(&have_mio))
+ return zpci_load_fh(data, addr, len);
+
+ cc = __pcilg_mio(data, (__force u64) addr, len, &status);
+ if (cc)
+ zpci_err_insn_addr(0, 'L', cc, status, (__force u64) addr, len);
+
+ return (cc > 0) ? -EIO : cc;
+}
+EXPORT_SYMBOL_GPL(zpci_load);
+
+/* PCI Store */
+static inline int __pcistg(u64 data, u64 req, u64 offset, u8 *status)
+{
+ union register_pair req_off = {.even = req, .odd = offset};
+ int cc = -ENXIO;
+
+ asm volatile (
+ " .insn rre,0xb9d00000,%[data],%[req_off]\n"
+ "0: ipm %[cc]\n"
+ " srl %[cc],28\n"
+ "1:\n"
+ EX_TABLE(0b, 1b)
+ : [cc] "+d" (cc), [req_off] "+&d" (req_off.pair)
+ : [data] "d" (data)
+ : "cc");
+ *status = req_off.even >> 24 & 0xff;
+ return cc;
+}
+
+int __zpci_store(u64 data, u64 req, u64 offset)
+{
+ bool retried = false;
+ u8 status;
+ int cc;
+
+ do {
+ cc = __pcistg(data, req, offset, &status);
+ if (cc == 2) {
+ udelay(ZPCI_INSN_BUSY_DELAY);
+ if (!retried) {
+ zpci_err_insn_req(1, 's', cc, status, req, offset);
+ retried = true;
+ }
+ }
+ } while (cc == 2);
+
+ if (cc)
+ zpci_err_insn_req(0, 's', cc, status, req, offset);
+ else if (retried)
+ zpci_err_insn_req(1, 's', cc, status, req, offset);
+
+ return (cc > 0) ? -EIO : cc;
+}
+EXPORT_SYMBOL_GPL(__zpci_store);
+
+static inline int zpci_store_fh(const volatile void __iomem *addr, u64 data,
+ unsigned long len)
+{
+ struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)];
+ u64 req = ZPCI_CREATE_REQ(READ_ONCE(entry->fh), entry->bar, len);
+
+ return __zpci_store(data, req, ZPCI_OFFSET(addr));
+}
+
+static inline int __pcistg_mio(u64 data, u64 ioaddr, u64 len, u8 *status)
+{
+ union register_pair ioaddr_len = {.even = ioaddr, .odd = len};
+ int cc = -ENXIO;
+
+ asm volatile (
+ " .insn rre,0xb9d40000,%[data],%[ioaddr_len]\n"
+ "0: ipm %[cc]\n"
+ " srl %[cc],28\n"
+ "1:\n"
+ EX_TABLE(0b, 1b)
+ : [cc] "+d" (cc), [ioaddr_len] "+&d" (ioaddr_len.pair)
+ : [data] "d" (data)
+ : "cc", "memory");
+ *status = ioaddr_len.odd >> 24 & 0xff;
+ return cc;
+}
+
+int zpci_store(const volatile void __iomem *addr, u64 data, unsigned long len)
+{
+ u8 status;
+ int cc;
+
+ if (!static_branch_unlikely(&have_mio))
+ return zpci_store_fh(addr, data, len);
+
+ cc = __pcistg_mio(data, (__force u64) addr, len, &status);
+ if (cc)
+ zpci_err_insn_addr(0, 'S', cc, status, (__force u64) addr, len);
+
+ return (cc > 0) ? -EIO : cc;
+}
+EXPORT_SYMBOL_GPL(zpci_store);
+
+/* PCI Store Block */
+static inline int __pcistb(const u64 *data, u64 req, u64 offset, u8 *status)
+{
+ int cc = -ENXIO;
+
+ asm volatile (
+ " .insn rsy,0xeb00000000d0,%[req],%[offset],%[data]\n"
+ "0: ipm %[cc]\n"
+ " srl %[cc],28\n"
+ "1:\n"
+ EX_TABLE(0b, 1b)
+ : [cc] "+d" (cc), [req] "+d" (req)
+ : [offset] "d" (offset), [data] "Q" (*data)
+ : "cc");
+ *status = req >> 24 & 0xff;
+ return cc;
+}
+
+int __zpci_store_block(const u64 *data, u64 req, u64 offset)
+{
+ bool retried = false;
+ u8 status;
+ int cc;
+
+ do {
+ cc = __pcistb(data, req, offset, &status);
+ if (cc == 2) {
+ udelay(ZPCI_INSN_BUSY_DELAY);
+ if (!retried) {
+ zpci_err_insn_req(0, 'b', cc, status, req, offset);
+ retried = true;
+ }
+ }
+ } while (cc == 2);
+
+ if (cc)
+ zpci_err_insn_req(0, 'b', cc, status, req, offset);
+ else if (retried)
+ zpci_err_insn_req(1, 'b', cc, status, req, offset);
+
+ return (cc > 0) ? -EIO : cc;
+}
+EXPORT_SYMBOL_GPL(__zpci_store_block);
+
+static inline int zpci_write_block_fh(volatile void __iomem *dst,
+ const void *src, unsigned long len)
+{
+ struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(dst)];
+ u64 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, len);
+ u64 offset = ZPCI_OFFSET(dst);
+
+ return __zpci_store_block(src, req, offset);
+}
+
+static inline int __pcistb_mio(const u64 *data, u64 ioaddr, u64 len, u8 *status)
+{
+ int cc = -ENXIO;
+
+ asm volatile (
+ " .insn rsy,0xeb00000000d4,%[len],%[ioaddr],%[data]\n"
+ "0: ipm %[cc]\n"
+ " srl %[cc],28\n"
+ "1:\n"
+ EX_TABLE(0b, 1b)
+ : [cc] "+d" (cc), [len] "+d" (len)
+ : [ioaddr] "d" (ioaddr), [data] "Q" (*data)
+ : "cc");
+ *status = len >> 24 & 0xff;
+ return cc;
+}
+
+int zpci_write_block(volatile void __iomem *dst,
+ const void *src, unsigned long len)
+{
+ u8 status;
+ int cc;
+
+ if (!static_branch_unlikely(&have_mio))
+ return zpci_write_block_fh(dst, src, len);
+
+ cc = __pcistb_mio(src, (__force u64) dst, len, &status);
+ if (cc)
+ zpci_err_insn_addr(0, 'B', cc, status, (__force u64) dst, len);
+
+ return (cc > 0) ? -EIO : cc;
+}
+EXPORT_SYMBOL_GPL(zpci_write_block);
+
+static inline void __pciwb_mio(void)
+{
+ asm volatile (".insn rre,0xb9d50000,0,0\n");
+}
+
+void zpci_barrier(void)
+{
+ if (static_branch_likely(&have_mio))
+ __pciwb_mio();
+}
+EXPORT_SYMBOL_GPL(zpci_barrier);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 19:45:31 +0000