[PATCH V0 1/2] mshv: Stub out deposit memory functions

[Mukesh R <mrathor@linux.microsoft.com>]

Stub out deposit memory functions so adding of new redesigned functions
is much eaiser to review.

Signed-off-by: Mukesh R <mrathor@linux.microsoft.com>
---
 drivers/hv/hv_proc.c | 126 ++-----------------------------------------
 1 file changed, 3 insertions(+), 123 deletions(-)

diff --git a/drivers/hv/hv_proc.c b/drivers/hv/hv_proc.c
index 57b2c64197cb..d5ce9a032e9c 100644
--- a/drivers/hv/hv_proc.c
+++ b/drivers/hv/hv_proc.c
@@ -9,135 +9,15 @@
 #include <linux/export.h>
 #include <asm/mshyperv.h>
 
-/*
- * See struct hv_deposit_memory. The first u64 is partition ID, the rest
- * are GPAs.
- */
-#define HV_DEPOSIT_MAX (HV_HYP_PAGE_SIZE / sizeof(u64) - 1)
-
-/* Deposits exact number of pages. Must be called with interrupts enabled.  */
 int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages)
 {
-	struct page **pages, *page;
-	int *counts;
-	int num_allocations;
-	int i, j, page_count;
-	int order;
-	u64 status;
-	int ret;
-	u64 base_pfn;
-	struct hv_deposit_memory *input_page;
-	unsigned long flags;
-
-	if (num_pages > HV_DEPOSIT_MAX)
-		return -E2BIG;
-	if (!num_pages)
-		return 0;
-
-	/* One buffer for page pointers and counts */
-	page = alloc_page(GFP_KERNEL);
-	if (!page)
-		return -ENOMEM;
-	pages = page_address(page);
-
-	counts = kzalloc_objs(int, HV_DEPOSIT_MAX);
-	if (!counts) {
-		free_page((unsigned long)pages);
-		return -ENOMEM;
-	}
-
-	/* Allocate all the pages before disabling interrupts */
-	i = 0;
-
-	while (num_pages) {
-		/* Find highest order we can actually allocate */
-		order = 31 - __builtin_clz(num_pages);
-
-		while (1) {
-			pages[i] = alloc_pages_node(node, GFP_KERNEL, order);
-			if (pages[i])
-				break;
-			if (!order) {
-				ret = -ENOMEM;
-				num_allocations = i;
-				goto err_free_allocations;
-			}
-			--order;
-		}
-
-		split_page(pages[i], order);
-		counts[i] = 1 << order;
-		num_pages -= counts[i];
-		i++;
-	}
-	num_allocations = i;
-
-	local_irq_save(flags);
-
-	input_page = *this_cpu_ptr(hyperv_pcpu_input_arg);
-
-	input_page->partition_id = partition_id;
-
-	/* Populate gpa_page_list - these will fit on the input page */
-	for (i = 0, page_count = 0; i < num_allocations; ++i) {
-		base_pfn = page_to_pfn(pages[i]);
-		for (j = 0; j < counts[i]; ++j, ++page_count)
-			input_page->gpa_page_list[page_count] = base_pfn + j;
-	}
-	status = hv_do_rep_hypercall(HVCALL_DEPOSIT_MEMORY,
-				     page_count, 0, input_page, NULL);
-	local_irq_restore(flags);
-	if (!hv_result_success(status)) {
-		hv_status_err(status, "\n");
-		ret = hv_result_to_errno(status);
-		goto err_free_allocations;
-	}
-
-	ret = 0;
-	goto free_buf;
-
-err_free_allocations:
-	for (i = 0; i < num_allocations; ++i) {
-		base_pfn = page_to_pfn(pages[i]);
-		for (j = 0; j < counts[i]; ++j)
-			__free_page(pfn_to_page(base_pfn + j));
-	}
-
-free_buf:
-	free_page((unsigned long)pages);
-	kfree(counts);
-	return ret;
+	return -ENOTSUPP;
 }
 EXPORT_SYMBOL_GPL(hv_call_deposit_pages);
 
-int hv_deposit_memory_node(int node, u64 partition_id,
-			   u64 hv_status)
+int hv_deposit_memory_node(int node, u64 partition_id, u64 hv_status)
 {
-	u32 num_pages = 1;
-
-	switch (hv_result(hv_status)) {
-	case HV_STATUS_INSUFFICIENT_MEMORY:
-		break;
-	case HV_STATUS_INSUFFICIENT_CONTIGUOUS_MEMORY:
-		num_pages = HV_MAX_CONTIGUOUS_ALLOCATION_PAGES;
-		break;
-
-	case HV_STATUS_INSUFFICIENT_CONTIGUOUS_ROOT_MEMORY:
-		num_pages = HV_MAX_CONTIGUOUS_ALLOCATION_PAGES;
-		fallthrough;
-	case HV_STATUS_INSUFFICIENT_ROOT_MEMORY:
-		if (!hv_root_partition()) {
-			hv_status_err(hv_status, "Unexpected root memory deposit\n");
-			return -ENOMEM;
-		}
-		partition_id = HV_PARTITION_ID_SELF;
-		break;
-
-	default:
-		hv_status_err(hv_status, "Unexpected!\n");
-		return -ENOMEM;
-	}
-	return hv_call_deposit_pages(node, partition_id, num_pages);
+	return -ENOTSUPP;
 }
 EXPORT_SYMBOL_GPL(hv_deposit_memory_node);
 
-- 
2.51.2.vfs.0.1