powerpc/pseries/cmm: Simulation mode

Let's allow to test the implementation without needing HW support.
When "simulate=1" is specified when loading the module, we bypass all
HW checks and HW calls. The sysfs file "simulate_loan_target_kb" can
be used to simulate HW requests.

The simualtion mode can be activated using:
  modprobe cmm debug=1 simulate=1

And the requested loan target can be changed using:
  echo X > /sys/devices/system/cmm/cmm0/simulate_loan_target_kb

Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191031142933.10779-11-david@redhat.com

diff --git a/arch/powerpc/platforms/pseries/cmm.c b/arch/powerpc/platforms/pseries/cmm.c
index 86eb845b4737de136b4dfc71be6ccc0e72480d29..91571841df8a70d0ea2520dd9c3977e6f85ccc24 100644 (file)
--- a/arch/powerpc/platforms/pseries/cmm.c
+++ b/arch/powerpc/platforms/pseries/cmm.c
@@ -51,6 +51,8 @@ static unsigned int oom_kb = CMM_OOM_KB;
 static unsigned int cmm_debug = CMM_DEBUG;
 static unsigned int cmm_disabled = CMM_DISABLE;
 static unsigned long min_mem_mb = CMM_MIN_MEM_MB;
+static bool __read_mostly simulate;
+static unsigned long simulate_loan_target_kb;
 static struct device cmm_dev;
 
 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
@@ -74,6 +76,8 @@ MODULE_PARM_DESC(min_mem_mb, "Minimum amount of memory (in MB) to not balloon. "
 module_param_named(debug, cmm_debug, uint, 0644);
 MODULE_PARM_DESC(debug, "Enable module debugging logging. Set to 1 to enable. "
                 "[Default=" __stringify(CMM_DEBUG) "]");
+module_param_named(simulate, simulate, bool, 0444);
+MODULE_PARM_DESC(simulate, "Enable simulation mode (no communication with hw).");
 
 #define cmm_dbg(...) if (cmm_debug) { printk(KERN_INFO "cmm: "__VA_ARGS__); }
 
@@ -94,6 +98,9 @@ static long plpar_page_set_loaned(struct page *page)
        long rc = 0;
        int i;
 
+       if (unlikely(simulate))
+               return 0;
+
        for (i = 0; !rc && i < PAGE_SIZE; i += cmo_page_sz)
                rc = plpar_hcall_norets(H_PAGE_INIT, H_PAGE_SET_LOANED, vpa + i, 0);
 
@@ -111,6 +118,9 @@ static long plpar_page_set_active(struct page *page)
        long rc = 0;
        int i;
 
+       if (unlikely(simulate))
+               return 0;
+
        for (i = 0; !rc && i < PAGE_SIZE; i += cmo_page_sz)
                rc = plpar_hcall_norets(H_PAGE_INIT, H_PAGE_SET_ACTIVE, vpa + i, 0);
 
@@ -234,13 +244,17 @@ static void cmm_get_mpp(void)
        signed long active_pages_target, page_loan_request, target;
        signed long min_mem_pages = (min_mem_mb * 1024 * 1024) / PAGE_SIZE;
 
-       rc = h_get_mpp(&mpp_data);
-
-       if (rc != H_SUCCESS)
-               return;
-
-       page_loan_request = div_s64((s64)mpp_data.loan_request, PAGE_SIZE);
-       target = page_loan_request + __loaned_pages;
+       if (likely(!simulate)) {
+               rc = h_get_mpp(&mpp_data);
+               if (rc != H_SUCCESS)
+                       return;
+               page_loan_request = div_s64((s64)mpp_data.loan_request,
+                                           PAGE_SIZE);
+               target = page_loan_request + __loaned_pages;
+       } else {
+               target = KB2PAGES(simulate_loan_target_kb);
+               page_loan_request = target - __loaned_pages;
+       }
 
        if (target < 0 || total_pages < min_mem_pages)
                target = 0;
@@ -362,6 +376,9 @@ static struct device_attribute *cmm_attrs[] = {
        &dev_attr_oom_freed_kb,
 };
 
+static DEVICE_ULONG_ATTR(simulate_loan_target_kb, 0644,
+                        simulate_loan_target_kb);
+
 static struct bus_type cmm_subsys = {
        .name = "cmm",
        .dev_name = "cmm",
@@ -396,6 +413,11 @@ static int cmm_sysfs_register(struct device *dev)
                        goto fail;
        }
 
+       if (!simulate)
+               return 0;
+       rc = device_create_file(dev, &dev_attr_simulate_loan_target_kb.attr);
+       if (rc)
+               goto fail;
        return 0;
 
 fail:
@@ -590,7 +612,7 @@ static int cmm_init(void)
 {
        int rc;
 
-       if (!firmware_has_feature(FW_FEATURE_CMO))
+       if (!firmware_has_feature(FW_FEATURE_CMO) && !simulate)
                return -EOPNOTSUPP;
 
        rc = cmm_balloon_compaction_init();