powerpc/hv_gpci: Add sysfs file inside hv_gpci device to show processor bus topology...

The hcall H_GET_PERF_COUNTER_INFO with counter request value as
PROCESSOR_BUS_TOPOLOGY(0XD0), can be used to get the system
topology information. To expose the system topology information,
patch adds sysfs file called "processor_bus_topology" to the
"/sys/devices/hv_gpci/interface/" of hv_gpci pmu driver.

Add macro for PROCESSOR_BUS_TOPOLOGY counter request value
in hv-gpci.c file. Also add a new function called
"systeminfo_gpci_request", to make the H_GET_PERF_COUNTER_INFO hcall
with added macro and populates the output buffer.

The processor_bus_topology sysfs file is only available for power10
and above platforms. Add a new function called
"add_sysinfo_interface_files", which will add processor_bus_topology
attribute in the interface_attrs array, only for power10 and
above platforms.
Also add macro INTERFACE_PROCESSOR_BUS_TOPOLOGY_ATTR in hv-gpci.c
file, which points to the index of NULL placefolder, for
processor_bus_topology attribute.

Reviewed-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230729073455.7918-2-kjain@linux.ibm.com

diff --git a/arch/powerpc/perf/hv-gpci.c b/arch/powerpc/perf/hv-gpci.c
index 7ff8ff3..7ac9cec 100644 (file)
--- a/arch/powerpc/perf/hv-gpci.c
+++ b/arch/powerpc/perf/hv-gpci.c
@@ -102,6 +102,141 @@ static ssize_t cpumask_show(struct device *dev,
        return cpumap_print_to_pagebuf(true, buf, &hv_gpci_cpumask);
 }
 
+/* Counter request value to retrieve system information */
+#define PROCESSOR_BUS_TOPOLOGY 0XD0
+
+/* Interface attribute array index to store system information */
+#define INTERFACE_PROCESSOR_BUS_TOPOLOGY_ATTR  6
+
+static DEFINE_PER_CPU(char, hv_gpci_reqb[HGPCI_REQ_BUFFER_SIZE]) __aligned(sizeof(uint64_t));
+
+static unsigned long systeminfo_gpci_request(u32 req, u32 starting_index,
+                       u16 secondary_index, char *buf,
+                       size_t *n, struct hv_gpci_request_buffer *arg)
+{
+       unsigned long ret;
+       size_t i, j;
+
+       arg->params.counter_request = cpu_to_be32(req);
+       arg->params.starting_index = cpu_to_be32(starting_index);
+       arg->params.secondary_index = cpu_to_be16(secondary_index);
+
+       ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
+                       virt_to_phys(arg), HGPCI_REQ_BUFFER_SIZE);
+
+       /*
+        * ret value as 'H_PARAMETER' corresponds to 'GEN_BUF_TOO_SMALL',
+        * which means that the current buffer size cannot accommodate
+        * all the information and a partial buffer returned.
+        * hcall fails incase of ret value other than H_SUCCESS or H_PARAMETER.
+        *
+        * ret value as H_AUTHORITY implies that partition is not permitted to retrieve
+        * performance information, and required to set
+        * "Enable Performance Information Collection" option.
+        */
+       if (ret == H_AUTHORITY)
+               return -EPERM;
+
+       /*
+        * hcall can fail with other possible ret value like H_PRIVILEGE/H_HARDWARE
+        * because of invalid buffer-length/address or due to some hardware
+        * error.
+        */
+       if (ret && (ret != H_PARAMETER))
+               return -EIO;
+
+       /*
+        * hcall H_GET_PERF_COUNTER_INFO populates the 'returned_values'
+        * to show the total number of counter_value array elements
+        * returned via hcall.
+        * hcall also populates 'cv_element_size' corresponds to individual
+        * counter_value array element size. Below loop go through all
+        * counter_value array elements as per their size and add it to
+        * the output buffer.
+        */
+       for (i = 0; i < be16_to_cpu(arg->params.returned_values); i++) {
+               j = i * be16_to_cpu(arg->params.cv_element_size);
+
+               for (; j < (i + 1) * be16_to_cpu(arg->params.cv_element_size); j++)
+                       *n += sprintf(buf + *n,  "%02x", (u8)arg->bytes[j]);
+               *n += sprintf(buf + *n,  "\n");
+       }
+
+       if (*n >= PAGE_SIZE) {
+               pr_info("System information exceeds PAGE_SIZE\n");
+               return -EFBIG;
+       }
+
+       return ret;
+}
+
+static ssize_t processor_bus_topology_show(struct device *dev, struct device_attribute *attr,
+                               char *buf)
+{
+       struct hv_gpci_request_buffer *arg;
+       unsigned long ret;
+       size_t n = 0;
+
+       arg = (void *)get_cpu_var(hv_gpci_reqb);
+       memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
+
+       /*
+        * Pass the counter request value 0xD0 corresponds to request
+        * type 'Processor_bus_topology', to retrieve
+        * the system topology information.
+        * starting_index value implies the starting hardware
+        * chip id.
+        */
+       ret = systeminfo_gpci_request(PROCESSOR_BUS_TOPOLOGY, 0, 0, buf, &n, arg);
+
+       if (!ret)
+               return n;
+
+       if (ret != H_PARAMETER)
+               goto out;
+
+       /*
+        * ret value as 'H_PARAMETER' corresponds to 'GEN_BUF_TOO_SMALL', which
+        * implies that buffer can't accommodate all information, and a partial buffer
+        * returned. To handle that, we need to make subsequent requests
+        * with next starting index to retrieve additional (missing) data.
+        * Below loop do subsequent hcalls with next starting index and add it
+        * to buffer util we get all the information.
+        */
+       while (ret == H_PARAMETER) {
+               int returned_values = be16_to_cpu(arg->params.returned_values);
+               int elementsize = be16_to_cpu(arg->params.cv_element_size);
+               int last_element = (returned_values - 1) * elementsize;
+
+               /*
+                * Since the starting index value is part of counter_value
+                * buffer elements, use the starting index value in the last
+                * element and add 1 to make subsequent hcalls.
+                */
+               u32 starting_index = arg->bytes[last_element + 3] +
+                               (arg->bytes[last_element + 2] << 8) +
+                               (arg->bytes[last_element + 1] << 16) +
+                               (arg->bytes[last_element] << 24) + 1;
+
+               memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
+
+               ret = systeminfo_gpci_request(PROCESSOR_BUS_TOPOLOGY, starting_index,
+                               0, buf, &n, arg);
+
+               if (!ret)
+                       return n;
+
+               if (ret != H_PARAMETER)
+                       goto out;
+       }
+
+       return n;
+
+out:
+       put_cpu_var(hv_gpci_reqb);
+       return ret;
+}
+
 static DEVICE_ATTR_RO(kernel_version);
 static DEVICE_ATTR_RO(cpumask);
 
@@ -118,6 +253,11 @@ static struct attribute *interface_attrs[] = {
        &hv_caps_attr_expanded.attr,
        &hv_caps_attr_lab.attr,
        &hv_caps_attr_collect_privileged.attr,
+       /*
+        * This NULL is a placeholder for the processor_bus_topology
+        * attribute, set in init function if applicable.
+        */
+       NULL,
        NULL,
 };
 
@@ -143,8 +283,6 @@ static const struct attribute_group *attr_groups[] = {
        NULL,
 };
 
-static DEFINE_PER_CPU(char, hv_gpci_reqb[HGPCI_REQ_BUFFER_SIZE]) __aligned(sizeof(uint64_t));
-
 static unsigned long single_gpci_request(u32 req, u32 starting_index,
                u16 secondary_index, u8 version_in, u32 offset, u8 length,
                u64 *value)
@@ -325,6 +463,41 @@ static int hv_gpci_cpu_hotplug_init(void)
                          ppc_hv_gpci_cpu_offline);
 }
 
+static void add_sysinfo_interface_files(void)
+{
+       struct device_attribute *attr = NULL;
+       unsigned long ret;
+       struct hv_gpci_request_buffer *arg;
+
+       /* Check for counter request type PROCESSOR_BUS_TOPOLOGY support */
+       arg = (void *)get_cpu_var(hv_gpci_reqb);
+       memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
+
+       arg->params.counter_request = cpu_to_be32(PROCESSOR_BUS_TOPOLOGY);
+
+       ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
+                       virt_to_phys(arg), HGPCI_REQ_BUFFER_SIZE);
+
+       put_cpu_var(hv_gpci_reqb);
+
+       /*
+        * Add processor_bus_topology attribute in the interface_attrs
+        * attribute array, only for valid return types.
+        */
+       if (!ret || ret == H_AUTHORITY || ret == H_PARAMETER) {
+               attr = kzalloc(sizeof(*attr), GFP_KERNEL);
+               if (!attr)
+                       return;
+
+               sysfs_attr_init(&attr->attr);
+               attr->attr.name = "processor_bus_topology";
+               attr->attr.mode = 0444;
+               attr->show = processor_bus_topology_show;
+               interface_attrs[INTERFACE_PROCESSOR_BUS_TOPOLOGY_ATTR] = &attr->attr;
+       } else
+               pr_devel("hcall failed, with error: 0x%lx\n", ret);
+}
+
 static int hv_gpci_init(void)
 {
        int r;
@@ -388,6 +561,10 @@ static int hv_gpci_init(void)
        if (r)
                return r;
 
+       /* sysinfo interface files are only available for power10 and above platforms */
+       if (PVR_VER(mfspr(SPRN_PVR)) >= PVR_POWER10)
+               add_sysinfo_interface_files();
+
        return 0;
 }