The following commit has been merged into the x86/mm branch of tip:
Commit-ID: e1d30a1f6c2196de359ac7c2726ba07fcd389cc4
Gitweb: https://git.kernel.org/tip/e1d30a1f6c2196de359ac7c2726ba07fcd389cc4
Author: Baoquan He <bhe@xxxxxxxxxx>
AuthorDate: Fri, 15 Nov 2024 09:21:29 +08:00
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Fri, 15 Nov 2024 12:03:36 +01:00
x86/ioremap: Introduce helper to check if physical address is in setup_data
Functions memremap_is_setup_data() and early_memremap_is_setup_data()
share completely the same process and handling, except of the
different memremap/unmap invocations.
Add helper __memremap_is_setup_data() to extract the common part,
parameter 'early' is used to decide what kind of memremap/unmap
APIs are called.
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20241115012131.509226-2-bhe@xxxxxxxxxx
---
arch/x86/mm/ioremap.c | 81 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 81 insertions(+)
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 8d29163..5ef6182 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -628,6 +628,87 @@ static bool memremap_is_efi_data(resource_size_t phys_addr,
return false;
}
+#define SD_SIZE sizeof(struct setup_data)
+/*
+ * Examine the physical address to determine if it is boot data by checking
+ * it against the boot params setup_data chain.
+ */
+static bool __init __memremap_is_setup_data(resource_size_t phys_addr,
+ bool early)
+{
+ struct setup_indirect *indirect;
+ struct setup_data *data;
+ u64 paddr, paddr_next;
+
+ paddr = boot_params.hdr.setup_data;
+ while (paddr) {
+ unsigned int len, size;
+
+ if (phys_addr == paddr)
+ return true;
+
+ if (early)
+ data = early_memremap_decrypted(paddr, SD_SIZE);
+ else
+ data = memremap(paddr, SD_SIZE,
+ MEMREMAP_WB | MEMREMAP_DEC);
+ if (!data) {
+ pr_warn("failed to memremap setup_data entry\n");
+ return false;
+ }
+
+ size = SD_SIZE;
+
+ paddr_next = data->next;
+ len = data->len;
+
+ if ((phys_addr > paddr) &&
+ (phys_addr < (paddr + SD_SIZE + len))) {
+ if (early)
+ early_memunmap(data, SD_SIZE);
+ else
+ memunmap(data);
+ return true;
+ }
+
+ if (data->type == SETUP_INDIRECT) {
+ size += len;
+ if (early) {
+ early_memunmap(data, SD_SIZE);
+ data = early_memremap_decrypted(paddr, size);
+ } else {
+ memunmap(data);
+ data = memremap(paddr, size,
+ MEMREMAP_WB | MEMREMAP_DEC);
+ }
+ if (!data) {
+ pr_warn("failed to memremap indirect setup_data\n");
+ return false;
+ }
+
+ indirect = (struct setup_indirect *)data->data;
+
+ if (indirect->type != SETUP_INDIRECT) {
+ paddr = indirect->addr;
+ len = indirect->len;
+ }
+ }
+
+ if (early)
+ early_memunmap(data, size);
+ else
+ memunmap(data);
+
+ if ((phys_addr > paddr) && (phys_addr < (paddr + len)))
+ return true;
+
+ paddr = paddr_next;
+ }
+
+ return false;
+}
+#undef SD_SIZE
+
/*
* Examine the physical address to determine if it is boot data by checking
* it against the boot params setup_data chain.
|