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[PATCH 1/3] x86/ioremap: introduce helper to check if physical address is in setup_data

Baoquan He posted 3 patches 1 week ago
There is a newer version of this series
[PATCH 1/3] x86/ioremap: introduce helper to check if physical address is in setup_data
Posted by Baoquan He 1 week ago 
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@redhat.com>
---
 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 8d29163568a7..5ef6182db630 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.
-- 
2.41.0
Re: [PATCH 1/3] x86/ioremap: introduce helper to check if physical address is in setup_data
Posted by Tom Lendacky 1 week ago 
On 11/14/24 19:21, Baoquan He wrote:
> 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@redhat.com>
> ---
>  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 8d29163568a7..5ef6182db630 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,

You should remove the __init for this helper since it is called by a
function that is outside of __init.

> +						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;

Just me, but I would use sizeof(*data) here instead of using a #define
that is later undefined below.

Thanks,
Tom

> +
> +		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.
Re: [PATCH 1/3] x86/ioremap: introduce helper to check if physical address is in setup_data
Posted by Baoquan He 1 week ago 
On 11/15/24 at 08:22am, Tom Lendacky wrote:
> On 11/14/24 19:21, Baoquan He wrote:
> > 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@redhat.com>
> > ---
> >  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 8d29163568a7..5ef6182db630 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,
> 
> You should remove the __init for this helper since it is called by a
> function that is outside of __init.

Removing __init for helper will trigger below warning. Then __ref need
be added to helper __memremap_is_setup_data() to suppress it. Maybe the
latter way should be taken since the helper need be called by a normal
function?

WARNING: modpost: vmlinux: section mismatch in reference: __memremap_is_setup_data+0x5f (section: .text) -> early_memunmap (section: .init.text)
WARNING: modpost: vmlinux: section mismatch in reference: __memremap_is_setup_data+0x167 (section: .text) -> early_memremap_decrypted (section: .init.text)
WARNING: modpost: vmlinux: section mismatch in reference: __memremap_is_setup_data+0x180 (section: .text) -> early_memunmap (section: .init.text)
WARNING: modpost: vmlinux: section mismatch in reference: __memremap_is_setup_data+0x1a9 (section: .text) -> early_memunmap (section: .init.text)
WARNING: modpost: vmlinux: section mismatch in reference: __memremap_is_setup_data+0x1b4 (section: .text) -> early_memremap_decrypted (section: .init.text)

Thanks
Baoquan
[tip: x86/mm] x86/ioremap: Introduce helper to check if physical address is in setup_data
Posted by tip-bot2 for Baoquan He 1 week ago 
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@redhat.com>
AuthorDate:    Fri, 15 Nov 2024 09:21:29 +08:00
Committer:     Ingo Molnar <mingo@kernel.org>
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@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20241115012131.509226-2-bhe@redhat.com
---
 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.

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