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Re: [PATCH v5 03/10] hw/fsi: Introduce IBM's cfam,fsi-slave

From: Ninad Palsule
Subject: Re: [PATCH v5 03/10] hw/fsi: Introduce IBM's cfam,fsi-slave
Date: Sat, 21 Oct 2023 15:34:27 -0500
User-agent: Mozilla Thunderbird 
Hello Daniel,


On 10/19/23 03:26, Daniel P. Berrangé wrote:

On Wed, Oct 11, 2023 at 10:13:32AM -0500, Ninad Palsule wrote:

This is a part of patchset where IBM's Flexible Service Interface is
introduced.

The Common FRU Access Macro (CFAM), an address space containing
various "engines" that drive accesses on busses internal and external
to the POWER chip. Examples include the SBEFIFO and I2C masters. The
engines hang off of an internal Local Bus (LBUS) which is described
by the CFAM configuration block.

The FSI slave: The slave is the terminal point of the FSI bus for
FSI symbols addressed to it. Slaves can be cascaded off of one
another. The slave's configuration registers appear in address space
of the CFAM to which it is attached.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Ninad Palsule <ninad@linux.ibm.com>
---
v2:
- Incorporated Joel's review comments.
v3:
- Incorporated Thomas Huth's review comments.
v5:
- Incorporated review comments by Cedric.



+static void cfam_realize(DeviceState *dev, Error **errp)
+{
+    CFAMState *cfam = CFAM(dev);
+    FSISlaveState *slave = FSI_SLAVE(dev);
+    Error *err = NULL;
+
+    /* Each slave has a 2MiB address space */
+    memory_region_init_io(&cfam->mr, OBJECT(cfam), &cfam_unimplemented_ops,
+                          cfam, TYPE_CFAM, 2 * 1024 * 1024);
+    address_space_init(&cfam->as, &cfam->mr, TYPE_CFAM);
+
+    qbus_init(&cfam->lbus, sizeof(cfam->lbus), TYPE_FSI_LBUS,
+                        DEVICE(cfam), NULL);
+
+    lbus_create_device(&cfam->lbus, TYPE_SCRATCHPAD, 0);
+
+    object_property_set_bool(OBJECT(&cfam->config), "realized", true, &err);
+    if (err) {
+        error_propagate(errp, err);
+        return;
+    }

object_property_set_bool returns false on error so this use of a local
Error object is redundant.

    if (!object_property_set_bool(..., &errp)) {
        return;
    }


If a local Error had been required though, this code should have instead
been using ERRP_GUARD - see include/qapi/error.h docs for illustration
for future work.

Fixed as per your suggestion.



+    qdev_set_parent_bus(DEVICE(&cfam->config), BUS(&cfam->lbus), &error_abort);
+
+    object_property_set_bool(OBJECT(&cfam->lbus), "realized", true, &err);
+    if (err) {
+        error_propagate(errp, err);
+        return;
+    }

Likewise


Fixed.

Thanks for the review.

Regards,

Ninad




+
+    memory_region_add_subregion(&cfam->mr, 0, &cfam->config.iomem);
+    /* memory_region_add_subregion(&cfam->mr, 0x800, &cfam->lbus.peek.iomem); 
*/
+    memory_region_add_subregion(&cfam->mr, 0x800, &slave->iomem);
+    memory_region_add_subregion(&cfam->mr, 0xc00, &cfam->lbus.mr);
+}
+
+static void cfam_init(Object *o)
+{
+    CFAMState *s = CFAM(o);
+
+    object_initialize_child(o, TYPE_CFAM_CONFIG, &s->config, TYPE_CFAM_CONFIG);
+}
+
+static void cfam_finalize(Object *o)
+{
+    CFAMState *s = CFAM(o);
+
+    address_space_destroy(&s->as);
+}
+
+static void cfam_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    dc->bus_type = TYPE_FSI_BUS;
+    dc->realize = cfam_realize;
+}
+
+static const TypeInfo cfam_info = {
+    .name = TYPE_CFAM,
+    .parent = TYPE_FSI_SLAVE,
+    .instance_init = cfam_init,
+    .instance_finalize = cfam_finalize,
+    .instance_size = sizeof(CFAMState),
+    .class_init = cfam_class_init,
+};
+
+static void cfam_register_types(void)
+{
+    type_register_static(&cfam_config_info);
+    type_register_static(&cfam_info);
+}
+
+type_init(cfam_register_types);
diff --git a/hw/fsi/fsi-slave.c b/hw/fsi/fsi-slave.c
new file mode 100644
index 0000000000..127fdd8a4f
--- /dev/null
+++ b/hw/fsi/fsi-slave.c
@@ -0,0 +1,96 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright (C) 2023 IBM Corp.
+ *
+ * IBM Flexible Service Interface slave
+ */
+
+#include "qemu/osdep.h"
+
+#include "qemu/bitops.h"
+#include "qapi/error.h"
+#include "qemu/log.h"
+#include "trace.h"
+
+#include "hw/fsi/fsi-slave.h"
+
+#define TO_REG(x)                               ((x) >> 2)
+
+#define FSI_SMODE               TO_REG(0x00)
+#define   FSI_SMODE_WSTART      BE_BIT(0)
+#define   FSI_SMODE_AUX_EN      BE_BIT(1)
+#define   FSI_SMODE_SLAVE_ID    BE_GENMASK(6, 7)
+#define   FSI_SMODE_ECHO_DELAY  BE_GENMASK(8, 11)
+#define   FSI_SMODE_SEND_DELAY  BE_GENMASK(12, 15)
+#define   FSI_SMODE_LBUS_DIV    BE_GENMASK(20, 23)
+#define   FSI_SMODE_BRIEF_LEFT  BE_GENMASK(24, 27)
+#define   FSI_SMODE_BRIEF_RIGHT BE_GENMASK(28, 31)
+
+#define FSI_SDMA                TO_REG(0x04)
+#define FSI_SISC                TO_REG(0x08)
+#define FSI_SCISC               TO_REG(0x08)
+#define FSI_SISM                TO_REG(0x0c)
+#define FSI_SISS                TO_REG(0x10)
+#define FSI_SSISM               TO_REG(0x10)
+#define FSI_SCISM               TO_REG(0x14)
+
+static uint64_t fsi_slave_read(void *opaque, hwaddr addr, unsigned size)
+{
+    FSISlaveState *s = FSI_SLAVE(opaque);
+
+    trace_fsi_slave_read(addr, size);
+
+    if (addr + size > sizeof(s->regs)) {
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Out of bounds read: 0x%"HWADDR_PRIx" for %u\n",
+                      __func__, addr, size);
+        return 0;
+    }
+
+    return s->regs[TO_REG(addr)];
+}
+
+static void fsi_slave_write(void *opaque, hwaddr addr, uint64_t data,
+                                 unsigned size)
+{
+    FSISlaveState *s = FSI_SLAVE(opaque);
+
+    trace_fsi_slave_write(addr, size, data);
+
+    if (addr + size > sizeof(s->regs)) {
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Out of bounds write: 0x%"HWADDR_PRIx" for %u\n",
+                      __func__, addr, size);
+        return;
+    }
+
+    s->regs[TO_REG(addr)] = data;
+}
+
+static const struct MemoryRegionOps fsi_slave_ops = {
+    .read = fsi_slave_read,
+    .write = fsi_slave_write,
+    .endianness = DEVICE_BIG_ENDIAN,
+};
+
+static void fsi_slave_init(Object *o)
+{
+    FSISlaveState *s = FSI_SLAVE(o);
+
+    memory_region_init_io(&s->iomem, OBJECT(s), &fsi_slave_ops,
+                          s, TYPE_FSI_SLAVE, 0x400);
+}
+
+static const TypeInfo fsi_slave_info = {
+    .name = TYPE_FSI_SLAVE,
+    .parent = TYPE_DEVICE,
+    .instance_init = fsi_slave_init,
+    .instance_size = sizeof(FSISlaveState),
+};
+
+static void fsi_slave_register_types(void)
+{
+    type_register_static(&fsi_slave_info);
+}
+
+type_init(fsi_slave_register_types);
diff --git a/hw/fsi/Kconfig b/hw/fsi/Kconfig
index f7c7fd1b28..8d712e77ed 100644
--- a/hw/fsi/Kconfig
+++ b/hw/fsi/Kconfig
@@ -1,3 +1,12 @@
+config FSI_CFAM
+    bool
+    select FSI
+    select FSI_SCRATCHPAD
+    select FSI_LBUS
+
+config FSI
+    bool
+
  config FSI_SCRATCHPAD
      bool
      select FSI_LBUS
diff --git a/hw/fsi/meson.build b/hw/fsi/meson.build
index d45a98c223..a9e7cd4099 100644
--- a/hw/fsi/meson.build
+++ b/hw/fsi/meson.build
@@ -1,2 +1,4 @@
  system_ss.add(when: 'CONFIG_FSI_LBUS', if_true: files('lbus.c'))
  system_ss.add(when: 'CONFIG_FSI_SCRATCHPAD', if_true: 
files('engine-scratchpad.c'))
+system_ss.add(when: 'CONFIG_FSI_CFAM', if_true: files('cfam.c'))
+system_ss.add(when: 'CONFIG_FSI', if_true: files('fsi-slave.c'))
diff --git a/hw/fsi/trace-events b/hw/fsi/trace-events
index 97fd070354..752a5683a0 100644
--- a/hw/fsi/trace-events
+++ b/hw/fsi/trace-events
@@ -1,2 +1,9 @@
  scratchpad_read(uint64_t addr, uint32_t size) "@0x%" PRIx64 " size=%d"
  scratchpad_write(uint64_t addr, uint32_t size, uint64_t data) "@0x%" PRIx64 " 
size=%d value=0x%"PRIx64
+cfam_config_read(uint64_t addr, uint32_t size) "@0x%" PRIx64 " size=%d"
+cfam_config_write(uint64_t addr, uint32_t size, uint64_t data) "@0x%" PRIx64 " 
size=%d value=0x%"PRIx64
+cfam_unimplemented_read(uint64_t addr, uint32_t size) "@0x%" PRIx64 " size=%d"
+cfam_unimplemented_write(uint64_t addr, uint32_t size, uint64_t data) "@0x%" PRIx64 
" size=%d value=0x%"PRIx64
+cfam_config_write_noaddr(uint64_t addr, uint32_t size, uint64_t data) "@0x%" PRIx64 
" size=%d value=0x%"PRIx64
+fsi_slave_read(uint64_t addr, uint32_t size) "@0x%" PRIx64 " size=%d"
+fsi_slave_write(uint64_t addr, uint32_t size, uint64_t data) "@0x%" PRIx64 " 
size=%d value=0x%"PRIx64
--
2.39.2


With regards,
Daniel
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