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linux/drivers/char/adi.c

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char: sparc64: Add privileged ADI driver SPARC M7 and newer processors utilize ADI to version and protect memory. This driver is capable of reading/writing ADI/MCD versions from privileged user space processes. Addresses in the adi file are mapped linearly to physical memory at a ratio of 1:adi_blksz. Thus, a read (or write) of offset K in the file operates upon the ADI version at physical address K * adi_blksz. The version information is encoded as one version per byte. Intended consumers are makedumpfile and crash. Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com> Reviewed-by: Khalid Aziz <khalid.aziz@oracle.com> Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com> Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-26 10:54:08 -06:00
char/adi: Use min_t(size_t,,) in adi_read() + adi_write() Replace min() and manual casting of MAX_BUF_SZ with min_t(size_t,,) in both adi_read() and adi_write(). This matches the initial buffer size calculation: ver_buf_sz = min_t(size_t, count, MAX_BUF_SZ); and makes the code more consistent. No functional changes intended. Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev> Link: https://patch.msgid.link/20250908181354.436680-2-thorsten.blum@linux.dev Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-09-08 20:13:54 +02:00
char: sparc64: Add privileged ADI driver SPARC M7 and newer processors utilize ADI to version and protect memory. This driver is capable of reading/writing ADI/MCD versions from privileged user space processes. Addresses in the adi file are mapped linearly to physical memory at a ratio of 1:adi_blksz. Thus, a read (or write) of offset K in the file operates upon the ADI version at physical address K * adi_blksz. The version information is encoded as one version per byte. Intended consumers are makedumpfile and crash. Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com> Reviewed-by: Khalid Aziz <khalid.aziz@oracle.com> Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com> Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-26 10:54:08 -06:00
char/adi: Remove redundant less-than-zero check in adi_write() The function parameter 'size_t count' is unsigned and cannot be less than zero. Remove the redundant condition. Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev> Link: https://lore.kernel.org/r/20250903202350.182446-2-thorsten.blum@linux.dev Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-09-03 22:23:51 +02:00
char: sparc64: Add privileged ADI driver SPARC M7 and newer processors utilize ADI to version and protect memory. This driver is capable of reading/writing ADI/MCD versions from privileged user space processes. Addresses in the adi file are mapped linearly to physical memory at a ratio of 1:adi_blksz. Thus, a read (or write) of offset K in the file operates upon the ADI version at physical address K * adi_blksz. The version information is encoded as one version per byte. Intended consumers are makedumpfile and crash. Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com> Reviewed-by: Khalid Aziz <khalid.aziz@oracle.com> Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com> Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-26 10:54:08 -06:00
char/adi: Use min_t(size_t,,) in adi_read() + adi_write() Replace min() and manual casting of MAX_BUF_SZ with min_t(size_t,,) in both adi_read() and adi_write(). This matches the initial buffer size calculation: ver_buf_sz = min_t(size_t, count, MAX_BUF_SZ); and makes the code more consistent. No functional changes intended. Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev> Link: https://patch.msgid.link/20250908181354.436680-2-thorsten.blum@linux.dev Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-09-08 20:13:54 +02:00
char: sparc64: Add privileged ADI driver SPARC M7 and newer processors utilize ADI to version and protect memory. This driver is capable of reading/writing ADI/MCD versions from privileged user space processes. Addresses in the adi file are mapped linearly to physical memory at a ratio of 1:adi_blksz. Thus, a read (or write) of offset K in the file operates upon the ADI version at physical address K * adi_blksz. The version information is encoded as one version per byte. Intended consumers are makedumpfile and crash. Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com> Reviewed-by: Khalid Aziz <khalid.aziz@oracle.com> Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com> Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-26 10:54:08 -06:00
fs: move FMODE_UNSIGNED_OFFSET to fop_flags This is another flag that is statically set and doesn't need to use up an FMODE_* bit. Move it to ->fop_flags and free up another FMODE_* bit. (1) mem_open() used from proc_mem_operations (2) adi_open() used from adi_fops (3) drm_open_helper(): (3.1) accel_open() used from DRM_ACCEL_FOPS (3.2) drm_open() used from (3.2.1) amdgpu_driver_kms_fops (3.2.2) psb_gem_fops (3.2.3) i915_driver_fops (3.2.4) nouveau_driver_fops (3.2.5) panthor_drm_driver_fops (3.2.6) radeon_driver_kms_fops (3.2.7) tegra_drm_fops (3.2.8) vmwgfx_driver_fops (3.2.9) xe_driver_fops (3.2.10) DRM_GEM_FOPS (3.2.11) DEFINE_DRM_GEM_DMA_FOPS (4) struct memdev sets fmode flags based on type of device opened. For devices using struct mem_fops unsigned offset is used. Mark all these file operations as FOP_UNSIGNED_OFFSET and add asserts into the open helper to ensure that the flag is always set. Link: https://lore.kernel.org/r/20240809-work-fop_unsigned-v1-1-658e054d893e@kernel.org Reviewed-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Christian Brauner <brauner@kernel.org>
2024-08-09 12:38:56 +02:00
char: sparc64: Add privileged ADI driver SPARC M7 and newer processors utilize ADI to version and protect memory. This driver is capable of reading/writing ADI/MCD versions from privileged user space processes. Addresses in the adi file are mapped linearly to physical memory at a ratio of 1:adi_blksz. Thus, a read (or write) of offset K in the file operates upon the ADI version at physical address K * adi_blksz. The version information is encoded as one version per byte. Intended consumers are makedumpfile and crash. Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com> Reviewed-by: Khalid Aziz <khalid.aziz@oracle.com> Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com> Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-26 10:54:08 -06:00