linux-stable.git/drivers/dma, branch v6.1.8 Linux kernel stable tree dmaengine: idxd: Do not call DMX TX callbacks during workqueue disable 2023-01-24T06:24:39+00:00 Reinette Chatre reinette.chatre@intel.com 2022-12-07T22:52:22+00:00 e7c07deaa1937a3c38d631b9f8d1c37b9f70dc42 commit 6744a030d81e456883bfbb627ac1f30465c1a989 upstream. On driver unload any pending descriptors are flushed and pending DMA descriptors are explicitly completed: idxd_dmaengine_drv_remove() -> drv_disable_wq() -> idxd_wq_free_irq() -> idxd_flush_pending_descs() -> idxd_dma_complete_txd() With this done during driver unload any remaining descriptor is likely stuck and can be dropped. Even so, the descriptor may still have a callback set that could no longer be accessible. An example of such a problem is when the dmatest fails and the dmatest module is unloaded. The failure of dmatest leaves descriptors with dma_async_tx_descriptor::callback pointing to code that no longer exist. This causes a page fault as below at the time the IDXD driver is unloaded when it attempts to run the callback: BUG: unable to handle page fault for address: ffffffffc0665190 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page Fix this by clearing the callback pointers on the transmit descriptors only when workqueue is disabled. Fixes: 403a2e236538 ("dmaengine: idxd: change MSIX allocation based on per wq activation") Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Reviewed-by: Fenghua Yu <fenghua.yu@intel.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/37d06b772aa7f8863ca50f90930ea2fd80b38fc3.1670452419.git.reinette.chatre@intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 6744a030d81e456883bfbb627ac1f30465c1a989 upstream.

On driver unload any pending descriptors are flushed and pending
DMA descriptors are explicitly completed:
idxd_dmaengine_drv_remove() ->
	drv_disable_wq() ->
		idxd_wq_free_irq() ->
			idxd_flush_pending_descs() ->
				idxd_dma_complete_txd()

With this done during driver unload any remaining descriptor is
likely stuck and can be dropped. Even so, the descriptor may still
have a callback set that could no longer be accessible. An
example of such a problem is when the dmatest fails and the dmatest
module is unloaded. The failure of dmatest leaves descriptors with
dma_async_tx_descriptor::callback pointing to code that no longer
exist. This causes a page fault as below at the time the IDXD driver
is unloaded when it attempts to run the callback:
 BUG: unable to handle page fault for address: ffffffffc0665190
 #PF: supervisor instruction fetch in kernel mode
 #PF: error_code(0x0010) - not-present page

Fix this by clearing the callback pointers on the transmit
descriptors only when workqueue is disabled.

Fixes: 403a2e236538 ("dmaengine: idxd: change MSIX allocation based on per wq activation")
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Fenghua Yu <fenghua.yu@intel.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/37d06b772aa7f8863ca50f90930ea2fd80b38fc3.1670452419.git.reinette.chatre@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
dmaengine: idxd: Prevent use after free on completion memory 2023-01-24T06:24:39+00:00 Reinette Chatre reinette.chatre@intel.com 2022-12-07T22:52:21+00:00 b9e8e3fcfec625fc1c2f68f684448aeeb882625b commit 1beeec45f9ac31eba52478379f70a5fa9c2ad005 upstream. On driver unload any pending descriptors are flushed at the time the interrupt is freed: idxd_dmaengine_drv_remove() -> drv_disable_wq() -> idxd_wq_free_irq() -> idxd_flush_pending_descs(). If there are any descriptors present that need to be flushed this flow triggers a "not present" page fault as below: BUG: unable to handle page fault for address: ff391c97c70c9040 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page The address that triggers the fault is the address of the descriptor that was freed moments earlier via: drv_disable_wq()->idxd_wq_free_resources() Fix the use after free by freeing the descriptors after any possible usage. This is done after idxd_wq_reset() to ensure that the memory remains accessible during possible completion writes by the device. Fixes: 63c14ae6c161 ("dmaengine: idxd: refactor wq driver enable/disable operations") Suggested-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Reviewed-by: Fenghua Yu <fenghua.yu@intel.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/6c4657d9cff0a0a00501a7b928297ac966e9ec9d.1670452419.git.reinette.chatre@intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 1beeec45f9ac31eba52478379f70a5fa9c2ad005 upstream.

On driver unload any pending descriptors are flushed at the
time the interrupt is freed:
idxd_dmaengine_drv_remove() ->
	drv_disable_wq() ->
		idxd_wq_free_irq() ->
			idxd_flush_pending_descs().

If there are any descriptors present that need to be flushed this
flow triggers a "not present" page fault as below:

 BUG: unable to handle page fault for address: ff391c97c70c9040
 #PF: supervisor read access in kernel mode
 #PF: error_code(0x0000) - not-present page

The address that triggers the fault is the address of the
descriptor that was freed moments earlier via:
drv_disable_wq()->idxd_wq_free_resources()

Fix the use after free by freeing the descriptors after any possible
usage. This is done after idxd_wq_reset() to ensure that the memory
remains accessible during possible completion writes by the device.

Fixes: 63c14ae6c161 ("dmaengine: idxd: refactor wq driver enable/disable operations")
Suggested-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Fenghua Yu <fenghua.yu@intel.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/6c4657d9cff0a0a00501a7b928297ac966e9ec9d.1670452419.git.reinette.chatre@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
dmaengine: idxd: Let probe fail when workqueue cannot be enabled 2023-01-24T06:24:39+00:00 Reinette Chatre reinette.chatre@intel.com 2022-12-07T22:52:20+00:00 99dc4520b74e7ca8e9dc9abe37a0b10b49467960 commit b51b75f0604f17c0f6f3b6f68f1a521a5cc6b04f upstream. The workqueue is enabled when the appropriate driver is loaded and disabled when the driver is removed. When the driver is removed it assumes that the workqueue was enabled successfully and proceeds to free allocations made during workqueue enabling. Failure during workqueue enabling does not prevent the driver from being loaded. This is because the error path within drv_enable_wq() returns success unless a second failure is encountered during the error path. By returning success it is possible to load the driver even if the workqueue cannot be enabled and allocations that do not exist are attempted to be freed during driver remove. Some examples of problematic flows: (a) idxd_dmaengine_drv_probe() -> drv_enable_wq() -> idxd_wq_request_irq(): In above flow, if idxd_wq_request_irq() fails then idxd_wq_unmap_portal() is called on error exit path, but drv_enable_wq() returns 0 because idxd_wq_disable() succeeds. The driver is thus loaded successfully. idxd_dmaengine_drv_remove()->drv_disable_wq()->idxd_wq_unmap_portal() Above flow on driver unload triggers the WARN in devm_iounmap() because the device resource has already been removed during error path of drv_enable_wq(). (b) idxd_dmaengine_drv_probe() -> drv_enable_wq() -> idxd_wq_request_irq(): In above flow, if idxd_wq_request_irq() fails then idxd_wq_init_percpu_ref() is never called to initialize the percpu counter, yet the driver loads successfully because drv_enable_wq() returns 0. idxd_dmaengine_drv_remove()->__idxd_wq_quiesce()->percpu_ref_kill(): Above flow on driver unload triggers a BUG when attempting to drop the initial ref of the uninitialized percpu ref: BUG: kernel NULL pointer dereference, address: 0000000000000010 Fix the drv_enable_wq() error path by returning the original error that indicates failure of workqueue enabling. This ensures that the probe fails when an error is encountered and the driver remove paths are only attempted when the workqueue was enabled successfully. Fixes: 1f2bb40337f0 ("dmaengine: idxd: move wq_enable() to device.c") Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Reviewed-by: Fenghua Yu <fenghua.yu@intel.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/e8d8116e5efa0fd14fadc5adae6ffd319f0e5ff1.1670452419.git.reinette.chatre@intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit b51b75f0604f17c0f6f3b6f68f1a521a5cc6b04f upstream.

The workqueue is enabled when the appropriate driver is loaded and
disabled when the driver is removed. When the driver is removed it
assumes that the workqueue was enabled successfully and proceeds to
free allocations made during workqueue enabling.

Failure during workqueue enabling does not prevent the driver from
being loaded. This is because the error path within drv_enable_wq()
returns success unless a second failure is encountered
during the error path. By returning success it is possible to load
the driver even if the workqueue cannot be enabled and
allocations that do not exist are attempted to be freed during
driver remove.

Some examples of problematic flows:
(a)

 idxd_dmaengine_drv_probe() -> drv_enable_wq() -> idxd_wq_request_irq():
 In above flow, if idxd_wq_request_irq() fails then
 idxd_wq_unmap_portal() is called on error exit path, but
 drv_enable_wq() returns 0 because idxd_wq_disable() succeeds. The
 driver is thus loaded successfully.

 idxd_dmaengine_drv_remove()->drv_disable_wq()->idxd_wq_unmap_portal()
 Above flow on driver unload triggers the WARN in devm_iounmap() because
 the device resource has already been removed during error path of
 drv_enable_wq().

(b)

 idxd_dmaengine_drv_probe() -> drv_enable_wq() -> idxd_wq_request_irq():
 In above flow, if idxd_wq_request_irq() fails then
 idxd_wq_init_percpu_ref() is never called to initialize the percpu
 counter, yet the driver loads successfully because drv_enable_wq()
 returns 0.

 idxd_dmaengine_drv_remove()->__idxd_wq_quiesce()->percpu_ref_kill():
 Above flow on driver unload triggers a BUG when attempting to drop the
 initial ref of the uninitialized percpu ref:
 BUG: kernel NULL pointer dereference, address: 0000000000000010

Fix the drv_enable_wq() error path by returning the original error that
indicates failure of workqueue enabling. This ensures that the probe
fails when an error is encountered and the driver remove paths are only
attempted when the workqueue was enabled successfully.

Fixes: 1f2bb40337f0 ("dmaengine: idxd: move wq_enable() to device.c")
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Fenghua Yu <fenghua.yu@intel.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/e8d8116e5efa0fd14fadc5adae6ffd319f0e5ff1.1670452419.git.reinette.chatre@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
dmaengine: tegra210-adma: fix global intr clear 2023-01-24T06:24:39+00:00 Mohan Kumar mkumard@nvidia.com 2023-01-02T06:48:44+00:00 8802fea8dd7f916682dc6448ee323aa1cdf3d3fe commit 9c7e355ccbb33d239360c876dbe49ad5ade65b47 upstream. The current global interrupt clear programming register offset was not correct. Fix the programming with right offset Fixes: ded1f3db4cd6 ("dmaengine: tegra210-adma: prepare for supporting newer Tegra chips") Cc: stable@vger.kernel.org Signed-off-by: Mohan Kumar <mkumard@nvidia.com> Link: https://lore.kernel.org/r/20230102064844.31306-1-mkumard@nvidia.com Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 9c7e355ccbb33d239360c876dbe49ad5ade65b47 upstream.

The current global interrupt clear programming register offset
was not correct. Fix the programming with right offset

Fixes: ded1f3db4cd6 ("dmaengine: tegra210-adma: prepare for supporting newer Tegra chips")
Cc: stable@vger.kernel.org
Signed-off-by: Mohan Kumar <mkumard@nvidia.com>
Link: https://lore.kernel.org/r/20230102064844.31306-1-mkumard@nvidia.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
dmaengine: lgm: Move DT parsing after initialization 2023-01-24T06:24:39+00:00 Peter Harliman Liem pliem@maxlinear.com 2023-01-05T03:05:51+00:00 16848cad1a48e25c6aad68b7ba21a1aa43826945 commit 96b3bb18f6cbe259ef4e0bed3135911b7e8d2af5 upstream. ldma_cfg_init() will parse DT to retrieve certain configs. However, that is called before ldma_dma_init_vXX(), which will make some initialization to channel configs. It will thus incorrectly overwrite certain configs that are declared in DT. To fix that, we move DT parsing after initialization. Function name is renamed to better represent what it does. Fixes: 32d31c79a1a4 ("dmaengine: Add Intel LGM SoC DMA support.") Signed-off-by: Peter Harliman Liem <pliem@maxlinear.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/afef6fc1ed20098b684e0d53737d69faf63c125f.1672887183.git.pliem@maxlinear.com Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 96b3bb18f6cbe259ef4e0bed3135911b7e8d2af5 upstream.

ldma_cfg_init() will parse DT to retrieve certain configs.
However, that is called before ldma_dma_init_vXX(), which
will make some initialization to channel configs. It will
thus incorrectly overwrite certain configs that are declared
in DT.

To fix that, we move DT parsing after initialization.
Function name is renamed to better represent what it does.

Fixes: 32d31c79a1a4 ("dmaengine: Add Intel LGM SoC DMA support.")
Signed-off-by: Peter Harliman Liem <pliem@maxlinear.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/afef6fc1ed20098b684e0d53737d69faf63c125f.1672887183.git.pliem@maxlinear.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Add exception protection processing for vd in axi_chan_handle_err function 2023-01-24T06:24:33+00:00 Shawn.Shao shawn.shao@jaguarmicro.com 2023-01-12T05:58:02+00:00 51a7ad5b60efac65691729d10745c28fa1016b96 commit 57054fe516d59d03a7bcf1888e82479ccc244f87 upstream. Since there is no protection for vd, a kernel panic will be triggered here in exceptional cases. You can refer to the processing of axi_chan_block_xfer_complete function The triggered kernel panic is as follows: [ 67.848444] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000060 [ 67.848447] Mem abort info: [ 67.848449] ESR = 0x96000004 [ 67.848451] EC = 0x25: DABT (current EL), IL = 32 bits [ 67.848454] SET = 0, FnV = 0 [ 67.848456] EA = 0, S1PTW = 0 [ 67.848458] Data abort info: [ 67.848460] ISV = 0, ISS = 0x00000004 [ 67.848462] CM = 0, WnR = 0 [ 67.848465] user pgtable: 4k pages, 48-bit VAs, pgdp=00000800c4c0b000 [ 67.848468] [0000000000000060] pgd=0000000000000000, p4d=0000000000000000 [ 67.848472] Internal error: Oops: 96000004 [#1] SMP [ 67.848475] Modules linked in: dmatest [ 67.848479] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.100-emu_x2rc+ #11 [ 67.848483] pstate: 62000085 (nZCv daIf -PAN -UAO +TCO BTYPE=--) [ 67.848487] pc : axi_chan_handle_err+0xc4/0x230 [ 67.848491] lr : axi_chan_handle_err+0x30/0x230 [ 67.848493] sp : ffff0803fe55ae50 [ 67.848495] x29: ffff0803fe55ae50 x28: ffff800011212200 [ 67.848500] x27: ffff0800c42c0080 x26: ffff0800c097c080 [ 67.848504] x25: ffff800010d33880 x24: ffff80001139d850 [ 67.848508] x23: ffff0800c097c168 x22: 0000000000000000 [ 67.848512] x21: 0000000000000080 x20: 0000000000002000 [ 67.848517] x19: ffff0800c097c080 x18: 0000000000000000 [ 67.848521] x17: 0000000000000000 x16: 0000000000000000 [ 67.848525] x15: 0000000000000000 x14: 0000000000000000 [ 67.848529] x13: 0000000000000000 x12: 0000000000000040 [ 67.848533] x11: ffff0800c0400248 x10: ffff0800c040024a [ 67.848538] x9 : ffff800010576cd4 x8 : ffff0800c0400270 [ 67.848542] x7 : 0000000000000000 x6 : ffff0800c04003e0 [ 67.848546] x5 : ffff0800c0400248 x4 : ffff0800c4294480 [ 67.848550] x3 : dead000000000100 x2 : dead000000000122 [ 67.848555] x1 : 0000000000000100 x0 : ffff0800c097c168 [ 67.848559] Call trace: [ 67.848562] axi_chan_handle_err+0xc4/0x230 [ 67.848566] dw_axi_dma_interrupt+0xf4/0x590 [ 67.848569] __handle_irq_event_percpu+0x60/0x220 [ 67.848573] handle_irq_event+0x64/0x120 [ 67.848576] handle_fasteoi_irq+0xc4/0x220 [ 67.848580] __handle_domain_irq+0x80/0xe0 [ 67.848583] gic_handle_irq+0xc0/0x138 [ 67.848585] el1_irq+0xc8/0x180 [ 67.848588] arch_cpu_idle+0x14/0x2c [ 67.848591] default_idle_call+0x40/0x16c [ 67.848594] do_idle+0x1f0/0x250 [ 67.848597] cpu_startup_entry+0x2c/0x60 [ 67.848600] rest_init+0xc0/0xcc [ 67.848603] arch_call_rest_init+0x14/0x1c [ 67.848606] start_kernel+0x4cc/0x500 [ 67.848610] Code: eb0002ff 9a9f12d6 f2fbd5a2 f2fbd5a3 (a94602c1) [ 67.848613] ---[ end trace 585a97036f88203a ]--- Signed-off-by: Shawn.Shao <shawn.shao@jaguarmicro.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20230112055802.1764-1-shawn.shao@jaguarmicro.com Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 57054fe516d59d03a7bcf1888e82479ccc244f87 upstream.

Since there is no protection for vd, a kernel panic will be
triggered here in exceptional cases.

You can refer to the processing of axi_chan_block_xfer_complete function

The triggered kernel panic is as follows:

[   67.848444] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000060
[   67.848447] Mem abort info:
[   67.848449]   ESR = 0x96000004
[   67.848451]   EC = 0x25: DABT (current EL), IL = 32 bits
[   67.848454]   SET = 0, FnV = 0
[   67.848456]   EA = 0, S1PTW = 0
[   67.848458] Data abort info:
[   67.848460]   ISV = 0, ISS = 0x00000004
[   67.848462]   CM = 0, WnR = 0
[   67.848465] user pgtable: 4k pages, 48-bit VAs, pgdp=00000800c4c0b000
[   67.848468] [0000000000000060] pgd=0000000000000000, p4d=0000000000000000
[   67.848472] Internal error: Oops: 96000004 [#1] SMP
[   67.848475] Modules linked in: dmatest
[   67.848479] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.100-emu_x2rc+ #11
[   67.848483] pstate: 62000085 (nZCv daIf -PAN -UAO +TCO BTYPE=--)
[   67.848487] pc : axi_chan_handle_err+0xc4/0x230
[   67.848491] lr : axi_chan_handle_err+0x30/0x230
[   67.848493] sp : ffff0803fe55ae50
[   67.848495] x29: ffff0803fe55ae50 x28: ffff800011212200
[   67.848500] x27: ffff0800c42c0080 x26: ffff0800c097c080
[   67.848504] x25: ffff800010d33880 x24: ffff80001139d850
[   67.848508] x23: ffff0800c097c168 x22: 0000000000000000
[   67.848512] x21: 0000000000000080 x20: 0000000000002000
[   67.848517] x19: ffff0800c097c080 x18: 0000000000000000
[   67.848521] x17: 0000000000000000 x16: 0000000000000000
[   67.848525] x15: 0000000000000000 x14: 0000000000000000
[   67.848529] x13: 0000000000000000 x12: 0000000000000040
[   67.848533] x11: ffff0800c0400248 x10: ffff0800c040024a
[   67.848538] x9 : ffff800010576cd4 x8 : ffff0800c0400270
[   67.848542] x7 : 0000000000000000 x6 : ffff0800c04003e0
[   67.848546] x5 : ffff0800c0400248 x4 : ffff0800c4294480
[   67.848550] x3 : dead000000000100 x2 : dead000000000122
[   67.848555] x1 : 0000000000000100 x0 : ffff0800c097c168
[   67.848559] Call trace:
[   67.848562]  axi_chan_handle_err+0xc4/0x230
[   67.848566]  dw_axi_dma_interrupt+0xf4/0x590
[   67.848569]  __handle_irq_event_percpu+0x60/0x220
[   67.848573]  handle_irq_event+0x64/0x120
[   67.848576]  handle_fasteoi_irq+0xc4/0x220
[   67.848580]  __handle_domain_irq+0x80/0xe0
[   67.848583]  gic_handle_irq+0xc0/0x138
[   67.848585]  el1_irq+0xc8/0x180
[   67.848588]  arch_cpu_idle+0x14/0x2c
[   67.848591]  default_idle_call+0x40/0x16c
[   67.848594]  do_idle+0x1f0/0x250
[   67.848597]  cpu_startup_entry+0x2c/0x60
[   67.848600]  rest_init+0xc0/0xcc
[   67.848603]  arch_call_rest_init+0x14/0x1c
[   67.848606]  start_kernel+0x4cc/0x500
[   67.848610] Code: eb0002ff 9a9f12d6 f2fbd5a2 f2fbd5a3 (a94602c1)
[   67.848613] ---[ end trace 585a97036f88203a ]---

Signed-off-by: Shawn.Shao <shawn.shao@jaguarmicro.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230112055802.1764-1-shawn.shao@jaguarmicro.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
dmaengine: idxd: Make read buffer sysfs attributes invisible for Intel IAA 2022-12-31T12:32:47+00:00 Xiaochen Shen xiaochen.shen@intel.com 2022-10-22T07:49:49+00:00 c91e4513bc182901fcc7590aa5cf51d058205818 [ Upstream commit 9a8ddb35a9d5d3ad76784a012459b256a9d7de7e ] In current code, the following sysfs attributes are exposed to user to show or update the values: max_read_buffers (max_tokens) read_buffer_limit (token_limit) group/read_buffers_allowed (group/tokens_allowed) group/read_buffers_reserved (group/tokens_reserved) group/use_read_buffer_limit (group/use_token_limit) >From Intel IAA spec [1], Intel IAA does not support Read Buffer allocation control. So these sysfs attributes should not be supported on IAA device. Fix this issue by making these sysfs attributes invisible through is_visible() filter when the device is IAA. Add description in the ABI documentation to mention that these attributes are not visible when the device does not support Read Buffer allocation control. [1]: https://cdrdv2.intel.com/v1/dl/getContent/721858 Fixes: fde212e44f45 ("dmaengine: idxd: deprecate token sysfs attributes for read buffers") Fixes: c52ca478233c ("dmaengine: idxd: add configuration component of driver") Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Link: https://lore.kernel.org/r/20221022074949.11719-1-xiaochen.shen@intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit 9a8ddb35a9d5d3ad76784a012459b256a9d7de7e ]

In current code, the following sysfs attributes are exposed to user to
show or update the values:
  max_read_buffers (max_tokens)
  read_buffer_limit (token_limit)
  group/read_buffers_allowed (group/tokens_allowed)
  group/read_buffers_reserved (group/tokens_reserved)
  group/use_read_buffer_limit (group/use_token_limit)

>From Intel IAA spec [1], Intel IAA does not support Read Buffer
allocation control. So these sysfs attributes should not be supported on
IAA device.

Fix this issue by making these sysfs attributes invisible through
is_visible() filter when the device is IAA.

Add description in the ABI documentation to mention that these
attributes are not visible when the device does not support Read Buffer
allocation control.

[1]: https://cdrdv2.intel.com/v1/dl/getContent/721858

Fixes: fde212e44f45 ("dmaengine: idxd: deprecate token sysfs attributes for read buffers")
Fixes: c52ca478233c ("dmaengine: idxd: add configuration component of driver")
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20221022074949.11719-1-xiaochen.shen@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
dmaengine: apple-admac: Allocate cache SRAM to channels 2022-12-31T12:32:46+00:00 Martin Povišer povik+lin@cutebit.org 2022-10-19T13:23:24+00:00 d53171d1d0e76bd1ac608601ba84ff439d027ee0 [ Upstream commit 568aa6dd641f63166bb60d769e256789b3ac42d4 ] There's a previously unknown part of the controller interface: We have to assign SRAM carveouts to channels to store their in-flight samples in. So, obtain the size of the SRAM from a read-only register and divide it into 2K blocks for allocation to channels. The FIFO depths we configure will always fit into 2K. (This fixes audio artifacts during simultaneous playback/capture on multiple channels -- which looking back is fully accounted for by having had the caches in the DMA controller overlap in memory.) Fixes: b127315d9a78 ("dmaengine: apple-admac: Add Apple ADMAC driver") Signed-off-by: Martin Povišer <povik+lin@cutebit.org> Link: https://lore.kernel.org/r/20221019132324.8585-2-povik+lin@cutebit.org Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit 568aa6dd641f63166bb60d769e256789b3ac42d4 ]

There's a previously unknown part of the controller interface: We have
to assign SRAM carveouts to channels to store their in-flight samples
in. So, obtain the size of the SRAM from a read-only register and divide
it into 2K blocks for allocation to channels. The FIFO depths we
configure will always fit into 2K.

(This fixes audio artifacts during simultaneous playback/capture on
multiple channels -- which looking back is fully accounted for by having
had the caches in the DMA controller overlap in memory.)

Fixes: b127315d9a78 ("dmaengine: apple-admac: Add Apple ADMAC driver")
Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
Link: https://lore.kernel.org/r/20221019132324.8585-2-povik+lin@cutebit.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
dmaengine: idxd: Make max batch size attributes in sysfs invisible for Intel IAA 2022-12-31T12:32:46+00:00 Xiaochen Shen xiaochen.shen@intel.com 2022-09-30T20:15:28+00:00 cc743a1d832d7ab1f9024e32f241724dfcd3bee7 [ Upstream commit 91123b37e8a99cc489d5bdcfebd1c25f29382504 ] In current code, dev.max_batch_size and wq.max_batch_size attributes in sysfs are exposed to user to show or update the values. >From Intel IAA spec [1], Intel IAA does not support batch processing. So these sysfs attributes should not be supported on IAA device. Fix this issue by making the attributes of max_batch_size invisible in sysfs through is_visible() filter when the device is IAA. Add description in the ABI documentation to mention that the attributes are not visible when the device does not support batch. [1]: https://cdrdv2.intel.com/v1/dl/getContent/721858 Fixes: e7184b159dd3 ("dmaengine: idxd: add support for configurable max wq batch size") Fixes: c52ca478233c ("dmaengine: idxd: add configuration component of driver") Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Reviewed-by: Fenghua Yu <fenghua.yu@intel.com> Link: https://lore.kernel.org/r/20220930201528.18621-3-xiaochen.shen@intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit 91123b37e8a99cc489d5bdcfebd1c25f29382504 ]

In current code, dev.max_batch_size and wq.max_batch_size attributes in
sysfs are exposed to user to show or update the values.

>From Intel IAA spec [1], Intel IAA does not support batch processing. So
these sysfs attributes should not be supported on IAA device.

Fix this issue by making the attributes of max_batch_size invisible in
sysfs through is_visible() filter when the device is IAA.

Add description in the ABI documentation to mention that the attributes
are not visible when the device does not support batch.

[1]: https://cdrdv2.intel.com/v1/dl/getContent/721858

Fixes: e7184b159dd3 ("dmaengine: idxd: add support for configurable max wq batch size")
Fixes: c52ca478233c ("dmaengine: idxd: add configuration component of driver")
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Fenghua Yu <fenghua.yu@intel.com>
Link: https://lore.kernel.org/r/20220930201528.18621-3-xiaochen.shen@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
dmaengine: at_hdmac: Check return code of dma_async_device_register 2022-11-08T05:13:57+00:00 Tudor Ambarus tudor.ambarus@microchip.com 2022-10-25T09:02:49+00:00 c47e6403fa099f200868d6b106701cb42d181d2b dma_async_device_register() can fail, check the return code and display an error. Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller") Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Cc: stable@vger.kernel.org Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-16-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org> 
dma_async_device_register() can fail, check the return code and display an
error.

Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller")
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Cc: stable@vger.kernel.org
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com
Link: https://lore.kernel.org/r/20221025090306.297886-16-tudor.ambarus@microchip.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>