linux-kernel - [PATCH 1/2] habanalabs: make sure device mem alloc is page aligned

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220221084914.493784-1-ogabbay@kernel.org>
Date:   Mon, 21 Feb 2022 10:49:13 +0200
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ohad Sharabi <osharabi@...ana.ai>
Subject: [PATCH 1/2] habanalabs: make sure device mem alloc is page aligned

From: Ohad Sharabi <osharabi@...ana.ai>

Working with MMU that supports multiple page sizes requires that mapping
of a page of a certain size will be aligned to the same size (e.g. the
physical address of 32MB page shall be aligned to 32MB).

To achieve this the gen_poll allocation is now using the "align" variant
to comply with the alignment requirements.

Signed-off-by: Ohad Sharabi <osharabi@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/memory.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/misc/habanalabs/common/memory.c b/drivers/misc/habanalabs/common/memory.c
index 385bf3448c73..0b76f40e9930 100644
--- a/drivers/misc/habanalabs/common/memory.c
+++ b/drivers/misc/habanalabs/common/memory.c
@@ -90,8 +90,8 @@ static int alloc_device_memory(struct hl_ctx *ctx, struct hl_mem_in *args,
 	struct hl_vm_phys_pg_pack *phys_pg_pack;
 	u64 paddr = 0, total_size, num_pgs, i;
 	u32 num_curr_pgs, page_size;
-	int handle, rc;
 	bool contiguous;
+	int handle, rc;
 
 	num_curr_pgs = 0;
 
@@ -110,7 +110,11 @@ static int alloc_device_memory(struct hl_ctx *ctx, struct hl_mem_in *args,
 	contiguous = args->flags & HL_MEM_CONTIGUOUS;
 
 	if (contiguous) {
-		paddr = (u64) gen_pool_alloc(vm->dram_pg_pool, total_size);
+		if (is_power_of_2(page_size))
+			paddr = (u64) gen_pool_dma_alloc_align(vm->dram_pg_pool, total_size, NULL,
+							page_size);
+		else
+			paddr = (u64) gen_pool_alloc(vm->dram_pg_pool, total_size);
 		if (!paddr) {
 			dev_err(hdev->dev,
 				"failed to allocate %llu contiguous pages with total size of %llu\n",
@@ -144,9 +148,14 @@ static int alloc_device_memory(struct hl_ctx *ctx, struct hl_mem_in *args,
 			phys_pg_pack->pages[i] = paddr + i * page_size;
 	} else {
 		for (i = 0 ; i < num_pgs ; i++) {
-			phys_pg_pack->pages[i] = (u64) gen_pool_alloc(
-							vm->dram_pg_pool,
-							page_size);
+			if (is_power_of_2(page_size))
+				phys_pg_pack->pages[i] =
+						(u64) gen_pool_dma_alloc_align(vm->dram_pg_pool,
+										page_size, NULL,
+										page_size);
+			else
+				phys_pg_pack->pages[i] = (u64) gen_pool_alloc(vm->dram_pg_pool,
+										page_size);
 			if (!phys_pg_pack->pages[i]) {
 				dev_err(hdev->dev,
 					"Failed to allocate device memory (out of memory)\n");
-- 
2.25.1