[RFC PATCH v2 7/8] ACPI: APEI: EINJ: Enable EINJv2 error injections

[Zaid Alali <zaidal@os.amperecomputing.com>]

Enable the driver to inject EINJv2 type errors. The component
array values are parsed from user_input and expected to contain
hex values for component id and syndrome separated by space,
and multiple components are separated by new line as follows:

component_id1 component_syndrome1
component_id2 component_syndrome2
 :
component_id(n) component_syndrome(n)

for example:

$comp_arr="0x1 0x2
>0x1 0x4
>0x2 0x4"
$cd /sys/kernel/debug/apei/einj/
$echo "$comp_arr" > einjv2_component_array

Signed-off-by: Zaid Alali <zaidal@os.amperecomputing.com>
---
 drivers/acpi/apei/einj-core.c | 81 ++++++++++++++++++++++++++++++++---
 1 file changed, 75 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/apei/einj-core.c b/drivers/acpi/apei/einj-core.c
index 2e30ebed079b..2e5c00b34a4b 100644
--- a/drivers/acpi/apei/einj-core.c
+++ b/drivers/acpi/apei/einj-core.c
@@ -87,6 +87,13 @@ enum {
 	SETWA_FLAGS_APICID = 1,
 	SETWA_FLAGS_MEM = 2,
 	SETWA_FLAGS_PCIE_SBDF = 4,
+	SETWA_FLAGS_EINJV2 = 8,
+};
+
+enum {
+	EINJV2_PROCESSOR_ERROR = 0x1,
+	EINJV2_MEMORY_ERROR = 0x2,
+	EINJV2_PCIE_ERROR = 0x4,
 };
 
 /*
@@ -111,6 +118,7 @@ static char vendor_dev[64];
 static struct debugfs_blob_wrapper einjv2_component_arr;
 static u64 component_count;
 static void *user_input;
+static int nr_components;
 static u32 available_error_type;
 static u32 available_error_type_v2;
 
@@ -287,8 +295,18 @@ static void *einj_get_parameter_address(void)
 
 		v5param = acpi_os_map_iomem(pa_v5, sizeof(*v5param));
 		if (v5param) {
+			int offset, len;
+
 			acpi5 = 1;
 			check_vendor_extension(pa_v5, v5param);
+			if (available_error_type & ACPI65_EINJV2_SUPP) {
+				len = v5param->einjv2_struct.length;
+				offset = offsetof(struct einjv2_extension_struct, component_arr);
+				nr_components = (len - offset) / 32;
+				acpi_os_unmap_iomem(v5param, sizeof(*v5param));
+				v5param = acpi_os_map_iomem(pa_v5, sizeof(*v5param) + (
+					(nr_components) * sizeof(struct syndrome_array)));
+			}
 			return v5param;
 		}
 	}
@@ -494,10 +512,52 @@ static int __einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2,
 			v5param->flags = vendor_flags;
 		} else if (flags) {
 			v5param->flags = flags;
-			v5param->memory_address = param1;
-			v5param->memory_address_range = param2;
-			v5param->apicid = param3;
-			v5param->pcie_sbdf = param4;
+			if (flags & SETWA_FLAGS_MEM) {
+				v5param->memory_address = param1;
+				v5param->memory_address_range = param2;
+			}
+			if (flags & SETWA_FLAGS_EINJV2) {
+				int count = 0, bytes_read, pos = 0;
+				unsigned int comp, synd;
+				struct syndrome_array *component_arr;
+
+				if (component_count > nr_components)
+					goto err_out;
+
+				v5param->einjv2_struct.component_arr_count = component_count;
+				component_arr = v5param->einjv2_struct.component_arr;
+
+				while (sscanf(user_input+pos, "%x %x\n%n", &comp, &synd,
+							&bytes_read) == 2) {
+					count++;
+					pos += bytes_read;
+					if (count > component_count)
+						goto err_out;
+
+					switch (type) {
+					case EINJV2_PROCESSOR_ERROR:
+						component_arr[count-1].comp_id.acpi_id = comp;
+						component_arr[count-1].comp_synd.proc_synd = synd;
+						break;
+					case EINJV2_MEMORY_ERROR:
+						component_arr[count-1].comp_id.device_id = comp;
+						component_arr[count-1].comp_synd.mem_synd = synd;
+						break;
+					case EINJV2_PCIE_ERROR:
+						component_arr[count-1].comp_id.pcie_sbdf = comp;
+						component_arr[count-1].comp_synd.pcie_synd = synd;
+						break;
+					}
+				}
+				if (count != component_count)
+					goto err_out;
+
+				/* clear buffer after user input for next injection */
+				memset(user_input, 0, COMP_ARR_SIZE);
+			} else {
+				v5param->apicid = param3;
+				v5param->pcie_sbdf = param4;
+			}
 		} else {
 			switch (type) {
 			case ACPI_EINJ_PROCESSOR_CORRECTABLE:
@@ -570,6 +630,9 @@ static int __einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2,
 	rc = apei_exec_run_optional(&ctx, ACPI_EINJ_END_OPERATION);
 
 	return rc;
+err_out:
+	memset(user_input, 0, COMP_ARR_SIZE);
+	return -EINVAL;
 }
 
 /* Inject the specified hardware error */
@@ -581,9 +644,14 @@ int einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2, u64 param3,
 
 	/* If user manually set "flags", make sure it is legal */
 	if (flags && (flags &
-		~(SETWA_FLAGS_APICID|SETWA_FLAGS_MEM|SETWA_FLAGS_PCIE_SBDF)))
+		~(SETWA_FLAGS_APICID|SETWA_FLAGS_MEM|SETWA_FLAGS_PCIE_SBDF|SETWA_FLAGS_EINJV2)))
 		return -EINVAL;
 
+	/*check if type is a valid EINJv2 error type*/
+	if (flags & SETWA_FLAGS_EINJV2) {
+		if (!(type & available_error_type_v2))
+			return -EINVAL;
+	}
 	/*
 	 * We need extra sanity checks for memory errors.
 	 * Other types leap directly to injection.
@@ -915,7 +983,8 @@ static void __exit einj_remove(struct platform_device *pdev)
 			sizeof(struct set_error_type_with_address) :
 			sizeof(struct einj_parameter);
 
-		acpi_os_unmap_iomem(einj_param, size);
+		acpi_os_unmap_iomem(einj_param,
+				size + (nr_components * sizeof(struct syndrome_array)));
 		if (vendor_errors.size)
 			acpi_os_unmap_memory(vendor_errors.data, vendor_errors.size);
 	}
-- 
2.34.1